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 | ||
d6fb79d4 AA |
156 | if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) { |
157 | nfs4_schedule_state_renewal(clp); | |
158 | return 0; | |
159 | } | |
160 | ||
9430fb6b RL |
161 | status = nfs4_proc_get_lease_time(clp, &fsinfo); |
162 | if (status == 0) { | |
163 | /* Update lease time and schedule renewal */ | |
164 | spin_lock(&clp->cl_lock); | |
165 | clp->cl_lease_time = fsinfo.lease_time * HZ; | |
166 | clp->cl_last_renewal = jiffies; | |
167 | spin_unlock(&clp->cl_lock); | |
168 | ||
169 | nfs4_schedule_state_renewal(clp); | |
170 | } | |
171 | ||
172 | return status; | |
173 | } | |
174 | ||
42acd021 AA |
175 | /* |
176 | * Back channel returns NFS4ERR_DELAY for new requests when | |
177 | * NFS4_SESSION_DRAINING is set so there is no work to be done when draining | |
178 | * is ended. | |
179 | */ | |
5601a00d | 180 | static void nfs4_end_drain_session(struct nfs_client *clp) |
9dfdf404 | 181 | { |
5601a00d | 182 | struct nfs4_session *ses = clp->cl_session; |
689cf5c1 AB |
183 | int max_slots; |
184 | ||
a2118c33 TM |
185 | if (ses == NULL) |
186 | return; | |
187 | if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) { | |
689cf5c1 AB |
188 | spin_lock(&ses->fc_slot_table.slot_tbl_lock); |
189 | max_slots = ses->fc_slot_table.max_slots; | |
190 | while (max_slots--) { | |
191 | struct rpc_task *task; | |
192 | ||
193 | task = rpc_wake_up_next(&ses->fc_slot_table. | |
194 | slot_tbl_waitq); | |
195 | if (!task) | |
196 | break; | |
197 | rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED); | |
198 | } | |
199 | spin_unlock(&ses->fc_slot_table.slot_tbl_lock); | |
200 | } | |
9dfdf404 RL |
201 | } |
202 | ||
42acd021 | 203 | static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl) |
9dfdf404 | 204 | { |
9dfdf404 | 205 | spin_lock(&tbl->slot_tbl_lock); |
9dfdf404 | 206 | if (tbl->highest_used_slotid != -1) { |
42acd021 | 207 | INIT_COMPLETION(tbl->complete); |
9dfdf404 | 208 | spin_unlock(&tbl->slot_tbl_lock); |
42acd021 | 209 | return wait_for_completion_interruptible(&tbl->complete); |
9dfdf404 RL |
210 | } |
211 | spin_unlock(&tbl->slot_tbl_lock); | |
212 | return 0; | |
213 | } | |
214 | ||
42acd021 AA |
215 | static int nfs4_begin_drain_session(struct nfs_client *clp) |
216 | { | |
217 | struct nfs4_session *ses = clp->cl_session; | |
218 | int ret = 0; | |
219 | ||
220 | set_bit(NFS4_SESSION_DRAINING, &ses->session_state); | |
221 | /* back channel */ | |
222 | ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table); | |
223 | if (ret) | |
224 | return ret; | |
225 | /* fore channel */ | |
226 | return nfs4_wait_on_slot_tbl(&ses->fc_slot_table); | |
227 | } | |
228 | ||
4d643d1d AA |
229 | int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) |
230 | { | |
231 | int status; | |
232 | ||
38045412 | 233 | nfs4_begin_drain_session(clp); |
4d643d1d | 234 | status = nfs4_proc_exchange_id(clp, cred); |
9430fb6b RL |
235 | if (status != 0) |
236 | goto out; | |
237 | status = nfs4_proc_create_session(clp); | |
238 | if (status != 0) | |
239 | goto out; | |
240 | nfs41_setup_state_renewal(clp); | |
241 | nfs_mark_client_ready(clp, NFS_CS_READY); | |
242 | out: | |
4d643d1d AA |
243 | return status; |
244 | } | |
245 | ||
b4b82607 AA |
246 | struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp) |
247 | { | |
248 | struct rpc_cred *cred; | |
249 | ||
250 | spin_lock(&clp->cl_lock); | |
251 | cred = nfs4_get_machine_cred_locked(clp); | |
252 | spin_unlock(&clp->cl_lock); | |
253 | return cred; | |
254 | } | |
255 | ||
256 | #endif /* CONFIG_NFS_V4_1 */ | |
257 | ||
24d292b8 CL |
258 | static struct rpc_cred * |
259 | nfs4_get_setclientid_cred_server(struct nfs_server *server) | |
286d7d6a | 260 | { |
24d292b8 CL |
261 | struct nfs_client *clp = server->nfs_client; |
262 | struct rpc_cred *cred = NULL; | |
286d7d6a | 263 | struct nfs4_state_owner *sp; |
9f958ab8 | 264 | struct rb_node *pos; |
24d292b8 CL |
265 | |
266 | spin_lock(&clp->cl_lock); | |
267 | pos = rb_first(&server->state_owners); | |
268 | if (pos != NULL) { | |
269 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
270 | cred = get_rpccred(sp->so_cred); | |
271 | } | |
272 | spin_unlock(&clp->cl_lock); | |
273 | return cred; | |
274 | } | |
275 | ||
276 | /** | |
277 | * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation | |
278 | * @clp: client state handle | |
279 | * | |
280 | * Returns an rpc_cred with reference count bumped, or NULL. | |
281 | */ | |
282 | struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp) | |
283 | { | |
284 | struct nfs_server *server; | |
a2b2bb88 | 285 | struct rpc_cred *cred; |
286d7d6a | 286 | |
6dc9d57a TM |
287 | spin_lock(&clp->cl_lock); |
288 | cred = nfs4_get_machine_cred_locked(clp); | |
24d292b8 | 289 | spin_unlock(&clp->cl_lock); |
a2b2bb88 TM |
290 | if (cred != NULL) |
291 | goto out; | |
24d292b8 CL |
292 | |
293 | rcu_read_lock(); | |
294 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
295 | cred = nfs4_get_setclientid_cred_server(server); | |
296 | if (cred != NULL) | |
297 | break; | |
286d7d6a | 298 | } |
24d292b8 CL |
299 | rcu_read_unlock(); |
300 | ||
a2b2bb88 TM |
301 | out: |
302 | return cred; | |
286d7d6a TM |
303 | } |
304 | ||
24d292b8 CL |
305 | static void nfs_alloc_unique_id_locked(struct rb_root *root, |
306 | struct nfs_unique_id *new, | |
307 | __u64 minval, int maxbits) | |
9f958ab8 TM |
308 | { |
309 | struct rb_node **p, *parent; | |
310 | struct nfs_unique_id *pos; | |
311 | __u64 mask = ~0ULL; | |
312 | ||
313 | if (maxbits < 64) | |
314 | mask = (1ULL << maxbits) - 1ULL; | |
315 | ||
316 | /* Ensure distribution is more or less flat */ | |
317 | get_random_bytes(&new->id, sizeof(new->id)); | |
318 | new->id &= mask; | |
319 | if (new->id < minval) | |
320 | new->id += minval; | |
321 | retry: | |
322 | p = &root->rb_node; | |
323 | parent = NULL; | |
324 | ||
325 | while (*p != NULL) { | |
326 | parent = *p; | |
327 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); | |
328 | ||
329 | if (new->id < pos->id) | |
330 | p = &(*p)->rb_left; | |
331 | else if (new->id > pos->id) | |
332 | p = &(*p)->rb_right; | |
333 | else | |
334 | goto id_exists; | |
335 | } | |
336 | rb_link_node(&new->rb_node, parent, p); | |
337 | rb_insert_color(&new->rb_node, root); | |
338 | return; | |
339 | id_exists: | |
340 | for (;;) { | |
341 | new->id++; | |
342 | if (new->id < minval || (new->id & mask) != new->id) { | |
343 | new->id = minval; | |
344 | break; | |
345 | } | |
346 | parent = rb_next(parent); | |
347 | if (parent == NULL) | |
348 | break; | |
349 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); | |
350 | if (new->id < pos->id) | |
351 | break; | |
352 | } | |
353 | goto retry; | |
354 | } | |
355 | ||
356 | static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id) | |
357 | { | |
358 | rb_erase(&id->rb_node, root); | |
359 | } | |
360 | ||
1da177e4 | 361 | static struct nfs4_state_owner * |
24d292b8 | 362 | nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred) |
1da177e4 | 363 | { |
24d292b8 | 364 | struct rb_node **p = &server->state_owners.rb_node, |
9f958ab8 | 365 | *parent = NULL; |
1da177e4 LT |
366 | struct nfs4_state_owner *sp, *res = NULL; |
367 | ||
9f958ab8 TM |
368 | while (*p != NULL) { |
369 | parent = *p; | |
24d292b8 | 370 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
9f958ab8 | 371 | |
6f2e64d3 TM |
372 | if (server < sp->so_server) { |
373 | p = &parent->rb_left; | |
374 | continue; | |
375 | } | |
376 | if (server > sp->so_server) { | |
377 | p = &parent->rb_right; | |
378 | continue; | |
379 | } | |
9f958ab8 TM |
380 | if (cred < sp->so_cred) |
381 | p = &parent->rb_left; | |
382 | else if (cred > sp->so_cred) | |
383 | p = &parent->rb_right; | |
384 | else { | |
385 | atomic_inc(&sp->so_count); | |
386 | res = sp; | |
387 | break; | |
388 | } | |
1da177e4 LT |
389 | } |
390 | return res; | |
391 | } | |
392 | ||
9f958ab8 | 393 | static struct nfs4_state_owner * |
24d292b8 | 394 | nfs4_insert_state_owner_locked(struct nfs4_state_owner *new) |
9f958ab8 | 395 | { |
24d292b8 CL |
396 | struct nfs_server *server = new->so_server; |
397 | struct rb_node **p = &server->state_owners.rb_node, | |
9f958ab8 TM |
398 | *parent = NULL; |
399 | struct nfs4_state_owner *sp; | |
400 | ||
401 | while (*p != NULL) { | |
402 | parent = *p; | |
24d292b8 | 403 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
9f958ab8 TM |
404 | |
405 | if (new->so_cred < sp->so_cred) | |
406 | p = &parent->rb_left; | |
407 | else if (new->so_cred > sp->so_cred) | |
408 | p = &parent->rb_right; | |
409 | else { | |
410 | atomic_inc(&sp->so_count); | |
411 | return sp; | |
412 | } | |
413 | } | |
24d292b8 CL |
414 | nfs_alloc_unique_id_locked(&server->openowner_id, |
415 | &new->so_owner_id, 1, 64); | |
416 | rb_link_node(&new->so_server_node, parent, p); | |
417 | rb_insert_color(&new->so_server_node, &server->state_owners); | |
9f958ab8 TM |
418 | return new; |
419 | } | |
420 | ||
421 | static void | |
24d292b8 | 422 | nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp) |
9f958ab8 | 423 | { |
24d292b8 CL |
424 | struct nfs_server *server = sp->so_server; |
425 | ||
426 | if (!RB_EMPTY_NODE(&sp->so_server_node)) | |
427 | rb_erase(&sp->so_server_node, &server->state_owners); | |
428 | nfs_free_unique_id(&server->openowner_id, &sp->so_owner_id); | |
9f958ab8 TM |
429 | } |
430 | ||
1da177e4 LT |
431 | /* |
432 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to | |
433 | * create a new state_owner. | |
434 | * | |
435 | */ | |
436 | static struct nfs4_state_owner * | |
437 | nfs4_alloc_state_owner(void) | |
438 | { | |
439 | struct nfs4_state_owner *sp; | |
440 | ||
8535b2be | 441 | sp = kzalloc(sizeof(*sp),GFP_NOFS); |
1da177e4 LT |
442 | if (!sp) |
443 | return NULL; | |
ec073428 | 444 | spin_lock_init(&sp->so_lock); |
1da177e4 | 445 | INIT_LIST_HEAD(&sp->so_states); |
cee54fc9 TM |
446 | rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue"); |
447 | sp->so_seqid.sequence = &sp->so_sequence; | |
448 | spin_lock_init(&sp->so_sequence.lock); | |
449 | INIT_LIST_HEAD(&sp->so_sequence.list); | |
1da177e4 LT |
450 | atomic_set(&sp->so_count, 1); |
451 | return sp; | |
452 | } | |
453 | ||
1d2e88e7 | 454 | static void |
1da177e4 LT |
455 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) |
456 | { | |
24d292b8 CL |
457 | if (!RB_EMPTY_NODE(&sp->so_server_node)) { |
458 | struct nfs_server *server = sp->so_server; | |
459 | struct nfs_client *clp = server->nfs_client; | |
9f958ab8 TM |
460 | |
461 | spin_lock(&clp->cl_lock); | |
24d292b8 CL |
462 | rb_erase(&sp->so_server_node, &server->state_owners); |
463 | RB_CLEAR_NODE(&sp->so_server_node); | |
9f958ab8 TM |
464 | spin_unlock(&clp->cl_lock); |
465 | } | |
1da177e4 LT |
466 | } |
467 | ||
24d292b8 CL |
468 | /** |
469 | * nfs4_get_state_owner - Look up a state owner given a credential | |
470 | * @server: nfs_server to search | |
471 | * @cred: RPC credential to match | |
472 | * | |
473 | * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL. | |
474 | */ | |
475 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, | |
476 | struct rpc_cred *cred) | |
1da177e4 | 477 | { |
7539bbab | 478 | struct nfs_client *clp = server->nfs_client; |
1da177e4 LT |
479 | struct nfs4_state_owner *sp, *new; |
480 | ||
1da177e4 | 481 | spin_lock(&clp->cl_lock); |
24d292b8 | 482 | sp = nfs4_find_state_owner_locked(server, cred); |
1da177e4 | 483 | spin_unlock(&clp->cl_lock); |
1da177e4 LT |
484 | if (sp != NULL) |
485 | return sp; | |
9f958ab8 TM |
486 | new = nfs4_alloc_state_owner(); |
487 | if (new == NULL) | |
488 | return NULL; | |
6f2e64d3 | 489 | new->so_server = server; |
9f958ab8 TM |
490 | new->so_cred = cred; |
491 | spin_lock(&clp->cl_lock); | |
24d292b8 | 492 | sp = nfs4_insert_state_owner_locked(new); |
9f958ab8 TM |
493 | spin_unlock(&clp->cl_lock); |
494 | if (sp == new) | |
495 | get_rpccred(cred); | |
f6a1cc89 TM |
496 | else { |
497 | rpc_destroy_wait_queue(&new->so_sequence.wait); | |
9f958ab8 | 498 | kfree(new); |
f6a1cc89 | 499 | } |
9f958ab8 | 500 | return sp; |
1da177e4 LT |
501 | } |
502 | ||
24d292b8 CL |
503 | /** |
504 | * nfs4_put_state_owner - Release a nfs4_state_owner | |
505 | * @sp: state owner data to release | |
506 | * | |
507 | */ | |
1da177e4 LT |
508 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) |
509 | { | |
1f0e890d | 510 | struct nfs_client *clp = sp->so_server->nfs_client; |
1da177e4 LT |
511 | struct rpc_cred *cred = sp->so_cred; |
512 | ||
513 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
514 | return; | |
24d292b8 | 515 | nfs4_remove_state_owner_locked(sp); |
1da177e4 | 516 | spin_unlock(&clp->cl_lock); |
f6a1cc89 | 517 | rpc_destroy_wait_queue(&sp->so_sequence.wait); |
1da177e4 LT |
518 | put_rpccred(cred); |
519 | kfree(sp); | |
520 | } | |
521 | ||
522 | static struct nfs4_state * | |
523 | nfs4_alloc_open_state(void) | |
524 | { | |
525 | struct nfs4_state *state; | |
526 | ||
8535b2be | 527 | state = kzalloc(sizeof(*state), GFP_NOFS); |
1da177e4 LT |
528 | if (!state) |
529 | return NULL; | |
1da177e4 LT |
530 | atomic_set(&state->count, 1); |
531 | INIT_LIST_HEAD(&state->lock_states); | |
8d0a8a9d | 532 | spin_lock_init(&state->state_lock); |
8bda4e4c | 533 | seqlock_init(&state->seqlock); |
1da177e4 LT |
534 | return state; |
535 | } | |
536 | ||
4cecb76f | 537 | void |
dc0b027d | 538 | nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) |
4cecb76f | 539 | { |
dc0b027d | 540 | if (state->state == fmode) |
4cecb76f TM |
541 | return; |
542 | /* NB! List reordering - see the reclaim code for why. */ | |
dc0b027d TM |
543 | if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { |
544 | if (fmode & FMODE_WRITE) | |
4cecb76f TM |
545 | list_move(&state->open_states, &state->owner->so_states); |
546 | else | |
547 | list_move_tail(&state->open_states, &state->owner->so_states); | |
548 | } | |
dc0b027d | 549 | state->state = fmode; |
4cecb76f TM |
550 | } |
551 | ||
1da177e4 LT |
552 | static struct nfs4_state * |
553 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
554 | { | |
555 | struct nfs_inode *nfsi = NFS_I(inode); | |
556 | struct nfs4_state *state; | |
557 | ||
558 | list_for_each_entry(state, &nfsi->open_states, inode_states) { | |
1c816efa | 559 | if (state->owner != owner) |
1da177e4 | 560 | continue; |
1c816efa | 561 | if (atomic_inc_not_zero(&state->count)) |
1da177e4 | 562 | return state; |
1da177e4 LT |
563 | } |
564 | return NULL; | |
565 | } | |
566 | ||
1da177e4 LT |
567 | static void |
568 | nfs4_free_open_state(struct nfs4_state *state) | |
569 | { | |
570 | kfree(state); | |
571 | } | |
572 | ||
573 | struct nfs4_state * | |
574 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
575 | { | |
576 | struct nfs4_state *state, *new; | |
577 | struct nfs_inode *nfsi = NFS_I(inode); | |
578 | ||
579 | spin_lock(&inode->i_lock); | |
580 | state = __nfs4_find_state_byowner(inode, owner); | |
581 | spin_unlock(&inode->i_lock); | |
582 | if (state) | |
583 | goto out; | |
584 | new = nfs4_alloc_open_state(); | |
ec073428 | 585 | spin_lock(&owner->so_lock); |
1da177e4 LT |
586 | spin_lock(&inode->i_lock); |
587 | state = __nfs4_find_state_byowner(inode, owner); | |
588 | if (state == NULL && new != NULL) { | |
589 | state = new; | |
1da177e4 LT |
590 | state->owner = owner; |
591 | atomic_inc(&owner->so_count); | |
592 | list_add(&state->inode_states, &nfsi->open_states); | |
593 | state->inode = igrab(inode); | |
594 | spin_unlock(&inode->i_lock); | |
ec073428 TM |
595 | /* Note: The reclaim code dictates that we add stateless |
596 | * and read-only stateids to the end of the list */ | |
597 | list_add_tail(&state->open_states, &owner->so_states); | |
598 | spin_unlock(&owner->so_lock); | |
1da177e4 LT |
599 | } else { |
600 | spin_unlock(&inode->i_lock); | |
ec073428 | 601 | spin_unlock(&owner->so_lock); |
1da177e4 LT |
602 | if (new) |
603 | nfs4_free_open_state(new); | |
604 | } | |
605 | out: | |
606 | return state; | |
607 | } | |
608 | ||
1da177e4 LT |
609 | void nfs4_put_open_state(struct nfs4_state *state) |
610 | { | |
611 | struct inode *inode = state->inode; | |
612 | struct nfs4_state_owner *owner = state->owner; | |
613 | ||
ec073428 | 614 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
1da177e4 | 615 | return; |
ec073428 | 616 | spin_lock(&inode->i_lock); |
ba683031 | 617 | list_del(&state->inode_states); |
1da177e4 | 618 | list_del(&state->open_states); |
ec073428 TM |
619 | spin_unlock(&inode->i_lock); |
620 | spin_unlock(&owner->so_lock); | |
1da177e4 | 621 | iput(inode); |
1da177e4 LT |
622 | nfs4_free_open_state(state); |
623 | nfs4_put_state_owner(owner); | |
624 | } | |
625 | ||
626 | /* | |
83c9d41e | 627 | * Close the current file. |
1da177e4 | 628 | */ |
8535b2be TM |
629 | static void __nfs4_close(struct path *path, struct nfs4_state *state, |
630 | fmode_t fmode, gfp_t gfp_mask, int wait) | |
1da177e4 | 631 | { |
1da177e4 | 632 | struct nfs4_state_owner *owner = state->owner; |
003707c7 | 633 | int call_close = 0; |
dc0b027d | 634 | fmode_t newstate; |
1da177e4 LT |
635 | |
636 | atomic_inc(&owner->so_count); | |
1da177e4 | 637 | /* Protect against nfs4_find_state() */ |
ec073428 | 638 | spin_lock(&owner->so_lock); |
dc0b027d | 639 | switch (fmode & (FMODE_READ | FMODE_WRITE)) { |
e7616923 TM |
640 | case FMODE_READ: |
641 | state->n_rdonly--; | |
642 | break; | |
643 | case FMODE_WRITE: | |
644 | state->n_wronly--; | |
645 | break; | |
646 | case FMODE_READ|FMODE_WRITE: | |
647 | state->n_rdwr--; | |
648 | } | |
003707c7 | 649 | newstate = FMODE_READ|FMODE_WRITE; |
e7616923 | 650 | if (state->n_rdwr == 0) { |
003707c7 | 651 | if (state->n_rdonly == 0) { |
e7616923 | 652 | newstate &= ~FMODE_READ; |
003707c7 TM |
653 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
654 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
655 | } | |
656 | if (state->n_wronly == 0) { | |
e7616923 | 657 | newstate &= ~FMODE_WRITE; |
003707c7 TM |
658 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
659 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
660 | } | |
661 | if (newstate == 0) | |
662 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
e7616923 | 663 | } |
003707c7 | 664 | nfs4_state_set_mode_locked(state, newstate); |
ec073428 | 665 | spin_unlock(&owner->so_lock); |
4cecb76f | 666 | |
003707c7 | 667 | if (!call_close) { |
b39e625b TM |
668 | nfs4_put_open_state(state); |
669 | nfs4_put_state_owner(owner); | |
f7e8917a FI |
670 | } else { |
671 | bool roc = pnfs_roc(state->inode); | |
672 | ||
673 | nfs4_do_close(path, state, gfp_mask, wait, roc); | |
674 | } | |
a49c3c77 TM |
675 | } |
676 | ||
dc0b027d | 677 | void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 678 | { |
8535b2be | 679 | __nfs4_close(path, state, fmode, GFP_NOFS, 0); |
a49c3c77 TM |
680 | } |
681 | ||
dc0b027d | 682 | void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 683 | { |
8535b2be | 684 | __nfs4_close(path, state, fmode, GFP_KERNEL, 1); |
1da177e4 LT |
685 | } |
686 | ||
687 | /* | |
688 | * Search the state->lock_states for an existing lock_owner | |
689 | * that is compatible with current->files | |
690 | */ | |
691 | static struct nfs4_lock_state * | |
77041ed9 | 692 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type) |
1da177e4 LT |
693 | { |
694 | struct nfs4_lock_state *pos; | |
695 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
77041ed9 | 696 | if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type) |
1da177e4 | 697 | continue; |
77041ed9 TM |
698 | switch (pos->ls_owner.lo_type) { |
699 | case NFS4_POSIX_LOCK_TYPE: | |
700 | if (pos->ls_owner.lo_u.posix_owner != fl_owner) | |
701 | continue; | |
702 | break; | |
703 | case NFS4_FLOCK_LOCK_TYPE: | |
704 | if (pos->ls_owner.lo_u.flock_owner != fl_pid) | |
705 | continue; | |
706 | } | |
1da177e4 LT |
707 | atomic_inc(&pos->ls_count); |
708 | return pos; | |
709 | } | |
710 | return NULL; | |
711 | } | |
712 | ||
1da177e4 LT |
713 | /* |
714 | * Return a compatible lock_state. If no initialized lock_state structure | |
715 | * exists, return an uninitialized one. | |
716 | * | |
1da177e4 | 717 | */ |
77041ed9 | 718 | 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 |
719 | { |
720 | struct nfs4_lock_state *lsp; | |
24d292b8 CL |
721 | struct nfs_server *server = state->owner->so_server; |
722 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 | 723 | |
8535b2be | 724 | lsp = kzalloc(sizeof(*lsp), GFP_NOFS); |
1da177e4 LT |
725 | if (lsp == NULL) |
726 | return NULL; | |
d0dc3701 TM |
727 | rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue"); |
728 | spin_lock_init(&lsp->ls_sequence.lock); | |
729 | INIT_LIST_HEAD(&lsp->ls_sequence.list); | |
730 | lsp->ls_seqid.sequence = &lsp->ls_sequence; | |
1da177e4 | 731 | atomic_set(&lsp->ls_count, 1); |
b64aec8d | 732 | lsp->ls_state = state; |
77041ed9 TM |
733 | lsp->ls_owner.lo_type = type; |
734 | switch (lsp->ls_owner.lo_type) { | |
735 | case NFS4_FLOCK_LOCK_TYPE: | |
736 | lsp->ls_owner.lo_u.flock_owner = fl_pid; | |
737 | break; | |
738 | case NFS4_POSIX_LOCK_TYPE: | |
739 | lsp->ls_owner.lo_u.posix_owner = fl_owner; | |
740 | break; | |
741 | default: | |
742 | kfree(lsp); | |
743 | return NULL; | |
744 | } | |
1da177e4 | 745 | spin_lock(&clp->cl_lock); |
24d292b8 | 746 | nfs_alloc_unique_id_locked(&server->lockowner_id, &lsp->ls_id, 1, 64); |
1da177e4 | 747 | spin_unlock(&clp->cl_lock); |
8d0a8a9d | 748 | INIT_LIST_HEAD(&lsp->ls_locks); |
1da177e4 LT |
749 | return lsp; |
750 | } | |
751 | ||
9f958ab8 TM |
752 | static void nfs4_free_lock_state(struct nfs4_lock_state *lsp) |
753 | { | |
24d292b8 CL |
754 | struct nfs_server *server = lsp->ls_state->owner->so_server; |
755 | struct nfs_client *clp = server->nfs_client; | |
9f958ab8 TM |
756 | |
757 | spin_lock(&clp->cl_lock); | |
24d292b8 | 758 | nfs_free_unique_id(&server->lockowner_id, &lsp->ls_id); |
9f958ab8 | 759 | spin_unlock(&clp->cl_lock); |
f6a1cc89 | 760 | rpc_destroy_wait_queue(&lsp->ls_sequence.wait); |
9f958ab8 TM |
761 | kfree(lsp); |
762 | } | |
763 | ||
1da177e4 LT |
764 | /* |
765 | * Return a compatible lock_state. If no initialized lock_state structure | |
766 | * exists, return an uninitialized one. | |
767 | * | |
1da177e4 | 768 | */ |
77041ed9 | 769 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type) |
1da177e4 | 770 | { |
8d0a8a9d | 771 | struct nfs4_lock_state *lsp, *new = NULL; |
1da177e4 | 772 | |
8d0a8a9d TM |
773 | for(;;) { |
774 | spin_lock(&state->state_lock); | |
77041ed9 | 775 | lsp = __nfs4_find_lock_state(state, owner, pid, type); |
8d0a8a9d TM |
776 | if (lsp != NULL) |
777 | break; | |
778 | if (new != NULL) { | |
8d0a8a9d TM |
779 | list_add(&new->ls_locks, &state->lock_states); |
780 | set_bit(LK_STATE_IN_USE, &state->flags); | |
781 | lsp = new; | |
782 | new = NULL; | |
783 | break; | |
784 | } | |
785 | spin_unlock(&state->state_lock); | |
77041ed9 | 786 | new = nfs4_alloc_lock_state(state, owner, pid, type); |
8d0a8a9d TM |
787 | if (new == NULL) |
788 | return NULL; | |
789 | } | |
790 | spin_unlock(&state->state_lock); | |
9f958ab8 TM |
791 | if (new != NULL) |
792 | nfs4_free_lock_state(new); | |
1da177e4 LT |
793 | return lsp; |
794 | } | |
795 | ||
796 | /* | |
8d0a8a9d TM |
797 | * Release reference to lock_state, and free it if we see that |
798 | * it is no longer in use | |
1da177e4 | 799 | */ |
faf5f49c | 800 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
1da177e4 | 801 | { |
8d0a8a9d | 802 | struct nfs4_state *state; |
1da177e4 | 803 | |
8d0a8a9d TM |
804 | if (lsp == NULL) |
805 | return; | |
806 | state = lsp->ls_state; | |
807 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) | |
808 | return; | |
809 | list_del(&lsp->ls_locks); | |
810 | if (list_empty(&state->lock_states)) | |
811 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
812 | spin_unlock(&state->state_lock); | |
d3c7b7cc TM |
813 | if (lsp->ls_flags & NFS_LOCK_INITIALIZED) |
814 | nfs4_release_lockowner(lsp); | |
9f958ab8 | 815 | nfs4_free_lock_state(lsp); |
1da177e4 LT |
816 | } |
817 | ||
8d0a8a9d | 818 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
1da177e4 | 819 | { |
8d0a8a9d | 820 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
1da177e4 | 821 | |
8d0a8a9d TM |
822 | dst->fl_u.nfs4_fl.owner = lsp; |
823 | atomic_inc(&lsp->ls_count); | |
824 | } | |
1da177e4 | 825 | |
8d0a8a9d | 826 | static void nfs4_fl_release_lock(struct file_lock *fl) |
1da177e4 | 827 | { |
8d0a8a9d | 828 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
1da177e4 LT |
829 | } |
830 | ||
6aed6285 | 831 | static const struct file_lock_operations nfs4_fl_lock_ops = { |
8d0a8a9d TM |
832 | .fl_copy_lock = nfs4_fl_copy_lock, |
833 | .fl_release_private = nfs4_fl_release_lock, | |
834 | }; | |
835 | ||
836 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
1da177e4 | 837 | { |
8d0a8a9d TM |
838 | struct nfs4_lock_state *lsp; |
839 | ||
840 | if (fl->fl_ops != NULL) | |
841 | return 0; | |
77041ed9 TM |
842 | if (fl->fl_flags & FL_POSIX) |
843 | lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE); | |
844 | else if (fl->fl_flags & FL_FLOCK) | |
845 | lsp = nfs4_get_lock_state(state, 0, fl->fl_pid, NFS4_FLOCK_LOCK_TYPE); | |
846 | else | |
847 | return -EINVAL; | |
8d0a8a9d TM |
848 | if (lsp == NULL) |
849 | return -ENOMEM; | |
850 | fl->fl_u.nfs4_fl.owner = lsp; | |
851 | fl->fl_ops = &nfs4_fl_lock_ops; | |
852 | return 0; | |
1da177e4 LT |
853 | } |
854 | ||
8d0a8a9d TM |
855 | /* |
856 | * Byte-range lock aware utility to initialize the stateid of read/write | |
857 | * requests. | |
1da177e4 | 858 | */ |
77041ed9 | 859 | void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid) |
1da177e4 | 860 | { |
8d0a8a9d | 861 | struct nfs4_lock_state *lsp; |
8bda4e4c | 862 | int seq; |
1da177e4 | 863 | |
8bda4e4c TM |
864 | do { |
865 | seq = read_seqbegin(&state->seqlock); | |
866 | memcpy(dst, &state->stateid, sizeof(*dst)); | |
867 | } while (read_seqretry(&state->seqlock, seq)); | |
8d0a8a9d TM |
868 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
869 | return; | |
1da177e4 | 870 | |
8d0a8a9d | 871 | spin_lock(&state->state_lock); |
77041ed9 | 872 | lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE); |
8d0a8a9d TM |
873 | if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) |
874 | memcpy(dst, &lsp->ls_stateid, sizeof(*dst)); | |
875 | spin_unlock(&state->state_lock); | |
1da177e4 LT |
876 | nfs4_put_lock_state(lsp); |
877 | } | |
878 | ||
8535b2be | 879 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask) |
cee54fc9 | 880 | { |
cee54fc9 TM |
881 | struct nfs_seqid *new; |
882 | ||
8535b2be | 883 | new = kmalloc(sizeof(*new), gfp_mask); |
cee54fc9 TM |
884 | if (new != NULL) { |
885 | new->sequence = counter; | |
2f74c0a0 | 886 | INIT_LIST_HEAD(&new->list); |
cee54fc9 TM |
887 | } |
888 | return new; | |
889 | } | |
890 | ||
72211dbe | 891 | void nfs_release_seqid(struct nfs_seqid *seqid) |
1da177e4 | 892 | { |
2f74c0a0 TM |
893 | if (!list_empty(&seqid->list)) { |
894 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
cee54fc9 | 895 | |
2f74c0a0 | 896 | spin_lock(&sequence->lock); |
72211dbe | 897 | list_del_init(&seqid->list); |
2f74c0a0 TM |
898 | spin_unlock(&sequence->lock); |
899 | rpc_wake_up(&sequence->wait); | |
900 | } | |
72211dbe TM |
901 | } |
902 | ||
903 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
904 | { | |
905 | nfs_release_seqid(seqid); | |
cee54fc9 | 906 | kfree(seqid); |
1da177e4 LT |
907 | } |
908 | ||
909 | /* | |
cee54fc9 TM |
910 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
911 | * failed with a seqid incrementing error - | |
912 | * see comments nfs_fs.h:seqid_mutating_error() | |
913 | */ | |
88d90939 | 914 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
cee54fc9 | 915 | { |
2f74c0a0 | 916 | BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid); |
cee54fc9 TM |
917 | switch (status) { |
918 | case 0: | |
919 | break; | |
920 | case -NFS4ERR_BAD_SEQID: | |
6f43ddcc TM |
921 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
922 | return; | |
923 | printk(KERN_WARNING "NFS: v4 server returned a bad" | |
497799e7 DM |
924 | " sequence-id error on an" |
925 | " unconfirmed sequence %p!\n", | |
6f43ddcc | 926 | seqid->sequence); |
cee54fc9 TM |
927 | case -NFS4ERR_STALE_CLIENTID: |
928 | case -NFS4ERR_STALE_STATEID: | |
929 | case -NFS4ERR_BAD_STATEID: | |
930 | case -NFS4ERR_BADXDR: | |
931 | case -NFS4ERR_RESOURCE: | |
932 | case -NFS4ERR_NOFILEHANDLE: | |
933 | /* Non-seqid mutating errors */ | |
934 | return; | |
935 | }; | |
936 | /* | |
937 | * Note: no locking needed as we are guaranteed to be first | |
938 | * on the sequence list | |
939 | */ | |
940 | seqid->sequence->counter++; | |
941 | } | |
942 | ||
943 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
944 | { | |
34dc1ad7 BH |
945 | struct nfs4_state_owner *sp = container_of(seqid->sequence, |
946 | struct nfs4_state_owner, so_seqid); | |
947 | struct nfs_server *server = sp->so_server; | |
948 | ||
949 | if (status == -NFS4ERR_BAD_SEQID) | |
1da177e4 | 950 | nfs4_drop_state_owner(sp); |
34dc1ad7 BH |
951 | if (!nfs4_has_session(server->nfs_client)) |
952 | nfs_increment_seqid(status, seqid); | |
cee54fc9 TM |
953 | } |
954 | ||
955 | /* | |
cee54fc9 TM |
956 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
957 | * failed with a seqid incrementing error - | |
958 | * see comments nfs_fs.h:seqid_mutating_error() | |
959 | */ | |
960 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
961 | { | |
88d90939 | 962 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
963 | } |
964 | ||
965 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
966 | { | |
967 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
968 | int status = 0; | |
969 | ||
970 | spin_lock(&sequence->lock); | |
2f74c0a0 TM |
971 | if (list_empty(&seqid->list)) |
972 | list_add_tail(&seqid->list, &sequence->list); | |
973 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) | |
974 | goto unlock; | |
5d00837b | 975 | rpc_sleep_on(&sequence->wait, task, NULL); |
2f74c0a0 TM |
976 | status = -EAGAIN; |
977 | unlock: | |
cee54fc9 TM |
978 | spin_unlock(&sequence->lock); |
979 | return status; | |
1da177e4 LT |
980 | } |
981 | ||
e005e804 | 982 | static int nfs4_run_state_manager(void *); |
1da177e4 | 983 | |
e005e804 | 984 | static void nfs4_clear_state_manager_bit(struct nfs_client *clp) |
433fbe4c TM |
985 | { |
986 | smp_mb__before_clear_bit(); | |
e005e804 | 987 | clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); |
433fbe4c | 988 | smp_mb__after_clear_bit(); |
e005e804 | 989 | wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); |
433fbe4c TM |
990 | rpc_wake_up(&clp->cl_rpcwaitq); |
991 | } | |
992 | ||
1da177e4 | 993 | /* |
e005e804 | 994 | * Schedule the nfs_client asynchronous state management routine |
1da177e4 | 995 | */ |
b0d3ded1 | 996 | void nfs4_schedule_state_manager(struct nfs_client *clp) |
1da177e4 | 997 | { |
5043e900 | 998 | struct task_struct *task; |
1da177e4 | 999 | |
e005e804 TM |
1000 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
1001 | return; | |
5043e900 TM |
1002 | __module_get(THIS_MODULE); |
1003 | atomic_inc(&clp->cl_count); | |
e005e804 | 1004 | task = kthread_run(nfs4_run_state_manager, clp, "%s-manager", |
5d8515ca CL |
1005 | rpc_peeraddr2str(clp->cl_rpcclient, |
1006 | RPC_DISPLAY_ADDR)); | |
5043e900 TM |
1007 | if (!IS_ERR(task)) |
1008 | return; | |
e005e804 | 1009 | nfs4_clear_state_manager_bit(clp); |
24c8dbbb | 1010 | nfs_put_client(clp); |
5043e900 | 1011 | module_put(THIS_MODULE); |
1da177e4 LT |
1012 | } |
1013 | ||
1014 | /* | |
0400a6b0 | 1015 | * Schedule a lease recovery attempt |
1da177e4 | 1016 | */ |
0400a6b0 | 1017 | void nfs4_schedule_lease_recovery(struct nfs_client *clp) |
1da177e4 LT |
1018 | { |
1019 | if (!clp) | |
1020 | return; | |
e598d843 TM |
1021 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
1022 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
e005e804 | 1023 | nfs4_schedule_state_manager(clp); |
1da177e4 LT |
1024 | } |
1025 | ||
f9feab1e | 1026 | static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
1027 | { |
1028 | ||
1029 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1030 | /* Don't recover state that expired before the reboot */ | |
1031 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { | |
1032 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1033 | return 0; | |
1034 | } | |
7eff03ae | 1035 | set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); |
b79a4a1b TM |
1036 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
1037 | return 1; | |
1038 | } | |
1039 | ||
f9feab1e | 1040 | static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
1041 | { |
1042 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); | |
1043 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
7eff03ae | 1044 | set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); |
b79a4a1b TM |
1045 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
1046 | return 1; | |
1047 | } | |
1048 | ||
0400a6b0 TM |
1049 | void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state) |
1050 | { | |
1051 | struct nfs_client *clp = server->nfs_client; | |
1052 | ||
1053 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1054 | nfs4_schedule_state_manager(clp); | |
1055 | } | |
1056 | ||
02860014 | 1057 | static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1058 | { |
1059 | struct inode *inode = state->inode; | |
19e03c57 | 1060 | struct nfs_inode *nfsi = NFS_I(inode); |
1da177e4 LT |
1061 | struct file_lock *fl; |
1062 | int status = 0; | |
1063 | ||
3f09df70 TM |
1064 | if (inode->i_flock == NULL) |
1065 | return 0; | |
1066 | ||
1067 | /* Guard against delegation returns and new lock/unlock calls */ | |
19e03c57 | 1068 | down_write(&nfsi->rwsem); |
3f09df70 | 1069 | /* Protect inode->i_flock using the BKL */ |
b89f4321 | 1070 | lock_flocks(); |
90dc7d27 | 1071 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
43b2a33a | 1072 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
1da177e4 | 1073 | continue; |
cd3758e3 | 1074 | if (nfs_file_open_context(fl->fl_file)->state != state) |
1da177e4 | 1075 | continue; |
b89f4321 | 1076 | unlock_flocks(); |
1da177e4 | 1077 | status = ops->recover_lock(state, fl); |
1da177e4 | 1078 | switch (status) { |
965b5d67 TM |
1079 | case 0: |
1080 | break; | |
1081 | case -ESTALE: | |
1082 | case -NFS4ERR_ADMIN_REVOKED: | |
1083 | case -NFS4ERR_STALE_STATEID: | |
1084 | case -NFS4ERR_BAD_STATEID: | |
1085 | case -NFS4ERR_EXPIRED: | |
1086 | case -NFS4ERR_NO_GRACE: | |
1087 | case -NFS4ERR_STALE_CLIENTID: | |
9c4c761a TM |
1088 | case -NFS4ERR_BADSESSION: |
1089 | case -NFS4ERR_BADSLOT: | |
1090 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1091 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
965b5d67 | 1092 | goto out; |
1da177e4 LT |
1093 | default: |
1094 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
3110ff80 | 1095 | __func__, status); |
965b5d67 TM |
1096 | case -ENOMEM: |
1097 | case -NFS4ERR_DENIED: | |
1da177e4 LT |
1098 | case -NFS4ERR_RECLAIM_BAD: |
1099 | case -NFS4ERR_RECLAIM_CONFLICT: | |
43b2a33a | 1100 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
965b5d67 | 1101 | status = 0; |
1da177e4 | 1102 | } |
b89f4321 | 1103 | lock_flocks(); |
1da177e4 | 1104 | } |
b89f4321 | 1105 | unlock_flocks(); |
965b5d67 | 1106 | out: |
19e03c57 | 1107 | up_write(&nfsi->rwsem); |
1da177e4 LT |
1108 | return status; |
1109 | } | |
1110 | ||
02860014 | 1111 | static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1112 | { |
1113 | struct nfs4_state *state; | |
1114 | struct nfs4_lock_state *lock; | |
1115 | int status = 0; | |
1116 | ||
1117 | /* Note: we rely on the sp->so_states list being ordered | |
1118 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
1119 | * states first. | |
1120 | * This is needed to ensure that the server won't give us any | |
1121 | * read delegations that we have to return if, say, we are | |
1122 | * recovering after a network partition or a reboot from a | |
1123 | * server that doesn't support a grace period. | |
1124 | */ | |
fe1d8195 TM |
1125 | restart: |
1126 | spin_lock(&sp->so_lock); | |
1da177e4 | 1127 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1128 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) |
1129 | continue; | |
1da177e4 LT |
1130 | if (state->state == 0) |
1131 | continue; | |
fe1d8195 TM |
1132 | atomic_inc(&state->count); |
1133 | spin_unlock(&sp->so_lock); | |
1da177e4 | 1134 | status = ops->recover_open(sp, state); |
1da177e4 | 1135 | if (status >= 0) { |
02860014 TM |
1136 | status = nfs4_reclaim_locks(state, ops); |
1137 | if (status >= 0) { | |
1138 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
1139 | if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) | |
1140 | printk("%s: Lock reclaim failed!\n", | |
3110ff80 | 1141 | __func__); |
02860014 | 1142 | } |
fe1d8195 TM |
1143 | nfs4_put_open_state(state); |
1144 | goto restart; | |
1da177e4 | 1145 | } |
1da177e4 LT |
1146 | } |
1147 | switch (status) { | |
1148 | default: | |
1149 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
3110ff80 | 1150 | __func__, status); |
1da177e4 | 1151 | case -ENOENT: |
965b5d67 | 1152 | case -ENOMEM: |
b79a4a1b | 1153 | case -ESTALE: |
1da177e4 LT |
1154 | /* |
1155 | * Open state on this file cannot be recovered | |
1156 | * All we can do is revert to using the zero stateid. | |
1157 | */ | |
1158 | memset(state->stateid.data, 0, | |
1159 | sizeof(state->stateid.data)); | |
1160 | /* Mark the file as being 'closed' */ | |
1161 | state->state = 0; | |
1162 | break; | |
168667c4 TM |
1163 | case -EKEYEXPIRED: |
1164 | /* | |
1165 | * User RPCSEC_GSS context has expired. | |
1166 | * We cannot recover this stateid now, so | |
1167 | * skip it and allow recovery thread to | |
1168 | * proceed. | |
1169 | */ | |
1170 | break; | |
965b5d67 TM |
1171 | case -NFS4ERR_ADMIN_REVOKED: |
1172 | case -NFS4ERR_STALE_STATEID: | |
1173 | case -NFS4ERR_BAD_STATEID: | |
b79a4a1b TM |
1174 | case -NFS4ERR_RECLAIM_BAD: |
1175 | case -NFS4ERR_RECLAIM_CONFLICT: | |
1f0e890d | 1176 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
b79a4a1b | 1177 | break; |
1da177e4 LT |
1178 | case -NFS4ERR_EXPIRED: |
1179 | case -NFS4ERR_NO_GRACE: | |
1f0e890d | 1180 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
1da177e4 | 1181 | case -NFS4ERR_STALE_CLIENTID: |
9c4c761a TM |
1182 | case -NFS4ERR_BADSESSION: |
1183 | case -NFS4ERR_BADSLOT: | |
1184 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1185 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1da177e4 LT |
1186 | goto out_err; |
1187 | } | |
fe1d8195 TM |
1188 | nfs4_put_open_state(state); |
1189 | goto restart; | |
1da177e4 | 1190 | } |
fe1d8195 | 1191 | spin_unlock(&sp->so_lock); |
1da177e4 LT |
1192 | return 0; |
1193 | out_err: | |
fe1d8195 | 1194 | nfs4_put_open_state(state); |
1da177e4 LT |
1195 | return status; |
1196 | } | |
1197 | ||
b79a4a1b TM |
1198 | static void nfs4_clear_open_state(struct nfs4_state *state) |
1199 | { | |
1200 | struct nfs4_lock_state *lock; | |
1201 | ||
1202 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
1203 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); | |
1204 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); | |
1205 | clear_bit(NFS_O_RDWR_STATE, &state->flags); | |
1206 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
b79a4a1b TM |
1207 | lock->ls_seqid.flags = 0; |
1208 | lock->ls_flags &= ~NFS_LOCK_INITIALIZED; | |
1209 | } | |
1210 | } | |
1211 | ||
24d292b8 CL |
1212 | static void nfs4_reset_seqids(struct nfs_server *server, |
1213 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
cee54fc9 | 1214 | { |
24d292b8 | 1215 | struct nfs_client *clp = server->nfs_client; |
cee54fc9 | 1216 | struct nfs4_state_owner *sp; |
9f958ab8 | 1217 | struct rb_node *pos; |
cee54fc9 | 1218 | struct nfs4_state *state; |
cee54fc9 | 1219 | |
24d292b8 CL |
1220 | spin_lock(&clp->cl_lock); |
1221 | for (pos = rb_first(&server->state_owners); | |
1222 | pos != NULL; | |
1223 | pos = rb_next(pos)) { | |
1224 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
cee54fc9 | 1225 | sp->so_seqid.flags = 0; |
ec073428 | 1226 | spin_lock(&sp->so_lock); |
cee54fc9 | 1227 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1228 | if (mark_reclaim(clp, state)) |
1229 | nfs4_clear_open_state(state); | |
cee54fc9 | 1230 | } |
ec073428 | 1231 | spin_unlock(&sp->so_lock); |
cee54fc9 | 1232 | } |
24d292b8 CL |
1233 | spin_unlock(&clp->cl_lock); |
1234 | } | |
1235 | ||
1236 | static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, | |
1237 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
1238 | { | |
1239 | struct nfs_server *server; | |
1240 | ||
1241 | rcu_read_lock(); | |
1242 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1243 | nfs4_reset_seqids(server, mark_reclaim); | |
1244 | rcu_read_unlock(); | |
cee54fc9 TM |
1245 | } |
1246 | ||
b79a4a1b TM |
1247 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
1248 | { | |
1249 | /* Mark all delegations for reclaim */ | |
1250 | nfs_delegation_mark_reclaim(clp); | |
1251 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); | |
1252 | } | |
1253 | ||
fce5c838 RL |
1254 | static void nfs4_reclaim_complete(struct nfs_client *clp, |
1255 | const struct nfs4_state_recovery_ops *ops) | |
1256 | { | |
1257 | /* Notify the server we're done reclaiming our state */ | |
1258 | if (ops->reclaim_complete) | |
1259 | (void)ops->reclaim_complete(clp); | |
1260 | } | |
1261 | ||
24d292b8 | 1262 | static void nfs4_clear_reclaim_server(struct nfs_server *server) |
b79a4a1b | 1263 | { |
24d292b8 | 1264 | struct nfs_client *clp = server->nfs_client; |
b79a4a1b TM |
1265 | struct nfs4_state_owner *sp; |
1266 | struct rb_node *pos; | |
1267 | struct nfs4_state *state; | |
1268 | ||
24d292b8 CL |
1269 | spin_lock(&clp->cl_lock); |
1270 | for (pos = rb_first(&server->state_owners); | |
1271 | pos != NULL; | |
1272 | pos = rb_next(pos)) { | |
1273 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
b79a4a1b TM |
1274 | spin_lock(&sp->so_lock); |
1275 | list_for_each_entry(state, &sp->so_states, open_states) { | |
24d292b8 CL |
1276 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, |
1277 | &state->flags)) | |
b79a4a1b TM |
1278 | continue; |
1279 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1280 | } | |
1281 | spin_unlock(&sp->so_lock); | |
1282 | } | |
24d292b8 CL |
1283 | spin_unlock(&clp->cl_lock); |
1284 | } | |
1285 | ||
1286 | static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp) | |
1287 | { | |
1288 | struct nfs_server *server; | |
1289 | ||
1290 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) | |
1291 | return 0; | |
1292 | ||
1293 | rcu_read_lock(); | |
1294 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1295 | nfs4_clear_reclaim_server(server); | |
1296 | rcu_read_unlock(); | |
b79a4a1b TM |
1297 | |
1298 | nfs_delegation_reap_unclaimed(clp); | |
6eaa6149 TM |
1299 | return 1; |
1300 | } | |
1301 | ||
1302 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) | |
1303 | { | |
1304 | if (!nfs4_state_clear_reclaim_reboot(clp)) | |
1305 | return; | |
1306 | nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops); | |
b79a4a1b TM |
1307 | } |
1308 | ||
1309 | static void nfs_delegation_clear_all(struct nfs_client *clp) | |
1310 | { | |
1311 | nfs_delegation_mark_reclaim(clp); | |
1312 | nfs_delegation_reap_unclaimed(clp); | |
1313 | } | |
1314 | ||
1315 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) | |
1316 | { | |
1317 | nfs_delegation_clear_all(clp); | |
1318 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); | |
1319 | } | |
1320 | ||
168667c4 TM |
1321 | static void nfs4_warn_keyexpired(const char *s) |
1322 | { | |
1323 | printk_ratelimited(KERN_WARNING "Error: state manager" | |
1324 | " encountered RPCSEC_GSS session" | |
1325 | " expired against NFSv4 server %s.\n", | |
1326 | s); | |
1327 | } | |
1328 | ||
4f7cdf18 | 1329 | static int nfs4_recovery_handle_error(struct nfs_client *clp, int error) |
e598d843 TM |
1330 | { |
1331 | switch (error) { | |
1332 | case -NFS4ERR_CB_PATH_DOWN: | |
707fb4b3 | 1333 | nfs_handle_cb_pathdown(clp); |
4f7cdf18 | 1334 | return 0; |
c8b7ae3d TM |
1335 | case -NFS4ERR_NO_GRACE: |
1336 | nfs4_state_end_reclaim_reboot(clp); | |
1337 | return 0; | |
e598d843 TM |
1338 | case -NFS4ERR_STALE_CLIENTID: |
1339 | case -NFS4ERR_LEASE_MOVED: | |
1340 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
6eaa6149 | 1341 | nfs4_state_clear_reclaim_reboot(clp); |
e598d843 TM |
1342 | nfs4_state_start_reclaim_reboot(clp); |
1343 | break; | |
1344 | case -NFS4ERR_EXPIRED: | |
1345 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1346 | nfs4_state_start_reclaim_nograce(clp); | |
8ba9bf8e | 1347 | break; |
c3fad1b1 AA |
1348 | case -NFS4ERR_BADSESSION: |
1349 | case -NFS4ERR_BADSLOT: | |
1350 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1351 | case -NFS4ERR_DEADSESSION: | |
1352 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1353 | case -NFS4ERR_SEQ_FALSE_RETRY: | |
1354 | case -NFS4ERR_SEQ_MISORDERED: | |
6df08189 | 1355 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
0b9e2d41 AA |
1356 | /* Zero session reset errors */ |
1357 | return 0; | |
168667c4 TM |
1358 | case -EKEYEXPIRED: |
1359 | /* Nothing we can do */ | |
1360 | nfs4_warn_keyexpired(clp->cl_hostname); | |
1361 | return 0; | |
e598d843 | 1362 | } |
4f7cdf18 | 1363 | return error; |
e598d843 TM |
1364 | } |
1365 | ||
02860014 | 1366 | static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 | 1367 | { |
24d292b8 CL |
1368 | struct nfs4_state_owner *sp; |
1369 | struct nfs_server *server; | |
9f958ab8 | 1370 | struct rb_node *pos; |
1da177e4 LT |
1371 | int status = 0; |
1372 | ||
7eff03ae | 1373 | restart: |
24d292b8 CL |
1374 | rcu_read_lock(); |
1375 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
1376 | spin_lock(&clp->cl_lock); | |
1377 | for (pos = rb_first(&server->state_owners); | |
1378 | pos != NULL; | |
1379 | pos = rb_next(pos)) { | |
1380 | sp = rb_entry(pos, | |
1381 | struct nfs4_state_owner, so_server_node); | |
1382 | if (!test_and_clear_bit(ops->owner_flag_bit, | |
1383 | &sp->so_flags)) | |
1384 | continue; | |
1385 | atomic_inc(&sp->so_count); | |
1386 | spin_unlock(&clp->cl_lock); | |
1387 | rcu_read_unlock(); | |
1388 | ||
1389 | status = nfs4_reclaim_open_state(sp, ops); | |
1390 | if (status < 0) { | |
1391 | set_bit(ops->owner_flag_bit, &sp->so_flags); | |
1392 | nfs4_put_state_owner(sp); | |
1393 | return nfs4_recovery_handle_error(clp, status); | |
1394 | } | |
1395 | ||
7eff03ae | 1396 | nfs4_put_state_owner(sp); |
24d292b8 | 1397 | goto restart; |
7eff03ae | 1398 | } |
24d292b8 | 1399 | spin_unlock(&clp->cl_lock); |
02860014 | 1400 | } |
24d292b8 | 1401 | rcu_read_unlock(); |
02860014 TM |
1402 | return status; |
1403 | } | |
1404 | ||
1405 | static int nfs4_check_lease(struct nfs_client *clp) | |
1406 | { | |
1407 | struct rpc_cred *cred; | |
c48f4f35 TM |
1408 | const struct nfs4_state_maintenance_ops *ops = |
1409 | clp->cl_mvops->state_renewal_ops; | |
02860014 | 1410 | int status = -NFS4ERR_EXPIRED; |
1da177e4 | 1411 | |
0f605b56 TM |
1412 | /* Is the client already known to have an expired lease? */ |
1413 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1414 | return 0; | |
a7b72103 AA |
1415 | spin_lock(&clp->cl_lock); |
1416 | cred = ops->get_state_renewal_cred_locked(clp); | |
1417 | spin_unlock(&clp->cl_lock); | |
0f605b56 TM |
1418 | if (cred == NULL) { |
1419 | cred = nfs4_get_setclientid_cred(clp); | |
1420 | if (cred == NULL) | |
1421 | goto out; | |
286d7d6a | 1422 | } |
8e69514f | 1423 | status = ops->renew_lease(clp, cred); |
0f605b56 TM |
1424 | put_rpccred(cred); |
1425 | out: | |
4f7cdf18 | 1426 | return nfs4_recovery_handle_error(clp, status); |
02860014 TM |
1427 | } |
1428 | ||
1429 | static int nfs4_reclaim_lease(struct nfs_client *clp) | |
1430 | { | |
1431 | struct rpc_cred *cred; | |
c48f4f35 TM |
1432 | const struct nfs4_state_recovery_ops *ops = |
1433 | clp->cl_mvops->reboot_recovery_ops; | |
02860014 TM |
1434 | int status = -ENOENT; |
1435 | ||
90a16617 | 1436 | cred = ops->get_clid_cred(clp); |
286d7d6a | 1437 | if (cred != NULL) { |
591d71cb | 1438 | status = ops->establish_clid(clp, cred); |
286d7d6a | 1439 | put_rpccred(cred); |
a2b2bb88 TM |
1440 | /* Handle case where the user hasn't set up machine creds */ |
1441 | if (status == -EACCES && cred == clp->cl_machine_cred) { | |
1442 | nfs4_clear_machine_cred(clp); | |
02860014 | 1443 | status = -EAGAIN; |
a2b2bb88 | 1444 | } |
c2e713dd BH |
1445 | if (status == -NFS4ERR_MINOR_VERS_MISMATCH) |
1446 | status = -EPROTONOSUPPORT; | |
286d7d6a | 1447 | } |
02860014 TM |
1448 | return status; |
1449 | } | |
1450 | ||
76db6d95 | 1451 | #ifdef CONFIG_NFS_V4_1 |
0400a6b0 TM |
1452 | void nfs4_schedule_session_recovery(struct nfs4_session *session) |
1453 | { | |
1454 | nfs4_schedule_lease_recovery(session->clp); | |
1455 | } | |
cbdabc7f | 1456 | EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery); |
0400a6b0 | 1457 | |
b9efa1b2 AA |
1458 | void nfs41_handle_recall_slot(struct nfs_client *clp) |
1459 | { | |
1460 | set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state); | |
0400a6b0 | 1461 | nfs4_schedule_state_manager(clp); |
b9efa1b2 AA |
1462 | } |
1463 | ||
0f79fd6f TM |
1464 | static void nfs4_reset_all_state(struct nfs_client *clp) |
1465 | { | |
1466 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
1467 | clp->cl_boot_time = CURRENT_TIME; | |
1468 | nfs4_state_start_reclaim_nograce(clp); | |
0400a6b0 | 1469 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1470 | } |
1471 | } | |
1472 | ||
1473 | static void nfs41_handle_server_reboot(struct nfs_client *clp) | |
1474 | { | |
1475 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
1476 | nfs4_state_start_reclaim_reboot(clp); | |
0400a6b0 | 1477 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1478 | } |
1479 | } | |
1480 | ||
1481 | static void nfs41_handle_state_revoked(struct nfs_client *clp) | |
1482 | { | |
1483 | /* Temporary */ | |
1484 | nfs4_reset_all_state(clp); | |
1485 | } | |
1486 | ||
1487 | static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp) | |
1488 | { | |
1489 | /* This will need to handle layouts too */ | |
1490 | nfs_expire_all_delegations(clp); | |
1491 | } | |
1492 | ||
1493 | static void nfs41_handle_cb_path_down(struct nfs_client *clp) | |
1494 | { | |
1495 | nfs_expire_all_delegations(clp); | |
1496 | if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0) | |
0400a6b0 | 1497 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1498 | } |
1499 | ||
0629e370 AB |
1500 | void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags) |
1501 | { | |
1502 | if (!flags) | |
1503 | return; | |
0f79fd6f TM |
1504 | else if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) |
1505 | nfs41_handle_server_reboot(clp); | |
1506 | else if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED | | |
0629e370 AB |
1507 | SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED | |
1508 | SEQ4_STATUS_ADMIN_STATE_REVOKED | | |
0f79fd6f TM |
1509 | SEQ4_STATUS_LEASE_MOVED)) |
1510 | nfs41_handle_state_revoked(clp); | |
1511 | else if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED) | |
1512 | nfs41_handle_recallable_state_revoked(clp); | |
1513 | else if (flags & (SEQ4_STATUS_CB_PATH_DOWN | | |
0629e370 AB |
1514 | SEQ4_STATUS_BACKCHANNEL_FAULT | |
1515 | SEQ4_STATUS_CB_PATH_DOWN_SESSION)) | |
0f79fd6f | 1516 | nfs41_handle_cb_path_down(clp); |
0629e370 AB |
1517 | } |
1518 | ||
c3fad1b1 AA |
1519 | static int nfs4_reset_session(struct nfs_client *clp) |
1520 | { | |
1521 | int status; | |
1522 | ||
38045412 | 1523 | nfs4_begin_drain_session(clp); |
c3fad1b1 AA |
1524 | status = nfs4_proc_destroy_session(clp->cl_session); |
1525 | if (status && status != -NFS4ERR_BADSESSION && | |
1526 | status != -NFS4ERR_DEADSESSION) { | |
f455848a | 1527 | status = nfs4_recovery_handle_error(clp, status); |
c3fad1b1 AA |
1528 | goto out; |
1529 | } | |
1530 | ||
1531 | memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN); | |
f26468fb | 1532 | status = nfs4_proc_create_session(clp); |
41f54a55 | 1533 | if (status) { |
f455848a | 1534 | status = nfs4_recovery_handle_error(clp, status); |
41f54a55 AA |
1535 | goto out; |
1536 | } | |
1537 | /* create_session negotiated new slot table */ | |
1538 | clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state); | |
9dfdf404 | 1539 | |
41f54a55 AA |
1540 | /* Let the state manager reestablish state */ |
1541 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
5601a00d | 1542 | nfs41_setup_state_renewal(clp); |
41f54a55 | 1543 | out: |
c3fad1b1 AA |
1544 | return status; |
1545 | } | |
76db6d95 | 1546 | |
b9efa1b2 AA |
1547 | static int nfs4_recall_slot(struct nfs_client *clp) |
1548 | { | |
1549 | struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table; | |
1550 | struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs; | |
1551 | struct nfs4_slot *new, *old; | |
1552 | int i; | |
1553 | ||
1554 | nfs4_begin_drain_session(clp); | |
1555 | new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot), | |
8535b2be | 1556 | GFP_NOFS); |
b9efa1b2 AA |
1557 | if (!new) |
1558 | return -ENOMEM; | |
1559 | ||
1560 | spin_lock(&fc_tbl->slot_tbl_lock); | |
1561 | for (i = 0; i < fc_tbl->target_max_slots; i++) | |
1562 | new[i].seq_nr = fc_tbl->slots[i].seq_nr; | |
1563 | old = fc_tbl->slots; | |
1564 | fc_tbl->slots = new; | |
1565 | fc_tbl->max_slots = fc_tbl->target_max_slots; | |
1566 | fc_tbl->target_max_slots = 0; | |
1567 | fc_attrs->max_reqs = fc_tbl->max_slots; | |
1568 | spin_unlock(&fc_tbl->slot_tbl_lock); | |
1569 | ||
1570 | kfree(old); | |
1571 | nfs4_end_drain_session(clp); | |
1572 | return 0; | |
1573 | } | |
1574 | ||
76db6d95 | 1575 | #else /* CONFIG_NFS_V4_1 */ |
c3fad1b1 | 1576 | static int nfs4_reset_session(struct nfs_client *clp) { return 0; } |
5601a00d | 1577 | static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; } |
b9efa1b2 | 1578 | static int nfs4_recall_slot(struct nfs_client *clp) { return 0; } |
76db6d95 AA |
1579 | #endif /* CONFIG_NFS_V4_1 */ |
1580 | ||
78722e9c AA |
1581 | /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors |
1582 | * on EXCHANGE_ID for v4.1 | |
1583 | */ | |
1584 | static void nfs4_set_lease_expired(struct nfs_client *clp, int status) | |
1585 | { | |
1586 | if (nfs4_has_session(clp)) { | |
1587 | switch (status) { | |
1588 | case -NFS4ERR_DELAY: | |
1589 | case -NFS4ERR_CLID_INUSE: | |
1590 | case -EAGAIN: | |
1591 | break; | |
1592 | ||
168667c4 TM |
1593 | case -EKEYEXPIRED: |
1594 | nfs4_warn_keyexpired(clp->cl_hostname); | |
78722e9c AA |
1595 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery |
1596 | * in nfs4_exchange_id */ | |
1597 | default: | |
1598 | return; | |
1599 | } | |
1600 | } | |
1601 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1602 | } | |
1603 | ||
e005e804 | 1604 | static void nfs4_state_manager(struct nfs_client *clp) |
02860014 | 1605 | { |
02860014 TM |
1606 | int status = 0; |
1607 | ||
02860014 | 1608 | /* Ensure exclusive access to NFSv4 state */ |
f3c76491 | 1609 | for(;;) { |
b79a4a1b TM |
1610 | if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
1611 | /* We're going to have to re-establish a clientid */ | |
1612 | status = nfs4_reclaim_lease(clp); | |
1613 | if (status) { | |
78722e9c | 1614 | nfs4_set_lease_expired(clp, status); |
b6d408ba TM |
1615 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, |
1616 | &clp->cl_state)) | |
b79a4a1b | 1617 | continue; |
76db6d95 AA |
1618 | if (clp->cl_cons_state == |
1619 | NFS_CS_SESSION_INITING) | |
1620 | nfs_mark_client_ready(clp, status); | |
b79a4a1b TM |
1621 | goto out_error; |
1622 | } | |
e598d843 | 1623 | clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); |
7cab89b2 | 1624 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
974cec8c | 1625 | pnfs_destroy_all_layouts(clp); |
e598d843 TM |
1626 | } |
1627 | ||
1628 | if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { | |
1629 | status = nfs4_check_lease(clp); | |
b6d408ba | 1630 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
e598d843 | 1631 | continue; |
b6d408ba TM |
1632 | if (status < 0 && status != -NFS4ERR_CB_PATH_DOWN) |
1633 | goto out_error; | |
b79a4a1b | 1634 | } |
b6d408ba | 1635 | |
c3fad1b1 | 1636 | /* Initialize or reset the session */ |
6df08189 | 1637 | if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) |
7111dc73 | 1638 | && nfs4_has_session(clp)) { |
4d643d1d | 1639 | status = nfs4_reset_session(clp); |
b6d408ba TM |
1640 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
1641 | continue; | |
1642 | if (status < 0) | |
76db6d95 | 1643 | goto out_error; |
76db6d95 | 1644 | } |
b6d408ba | 1645 | |
b79a4a1b | 1646 | /* First recover reboot state... */ |
e345e88a | 1647 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { |
591d71cb | 1648 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 1649 | clp->cl_mvops->reboot_recovery_ops); |
b6d408ba | 1650 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 1651 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) |
c3fad1b1 | 1652 | continue; |
b79a4a1b | 1653 | nfs4_state_end_reclaim_reboot(clp); |
b6d408ba TM |
1654 | if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) |
1655 | continue; | |
1656 | if (status < 0) | |
1657 | goto out_error; | |
02860014 TM |
1658 | } |
1659 | ||
b79a4a1b TM |
1660 | /* Now recover expired state... */ |
1661 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { | |
591d71cb | 1662 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 1663 | clp->cl_mvops->nograce_recovery_ops); |
b6d408ba | 1664 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 1665 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) || |
b6d408ba TM |
1666 | test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
1667 | continue; | |
1668 | if (status < 0) | |
b79a4a1b | 1669 | goto out_error; |
1da177e4 | 1670 | } |
707fb4b3 | 1671 | |
5601a00d | 1672 | nfs4_end_drain_session(clp); |
707fb4b3 TM |
1673 | if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { |
1674 | nfs_client_return_marked_delegations(clp); | |
1675 | continue; | |
1676 | } | |
b9efa1b2 AA |
1677 | /* Recall session slots */ |
1678 | if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state) | |
1679 | && nfs4_has_session(clp)) { | |
1680 | status = nfs4_recall_slot(clp); | |
1681 | if (status < 0) | |
1682 | goto out_error; | |
1683 | continue; | |
1684 | } | |
1685 | ||
e005e804 TM |
1686 | |
1687 | nfs4_clear_state_manager_bit(clp); | |
f3c76491 TM |
1688 | /* Did we race with an attempt to give us more work? */ |
1689 | if (clp->cl_state == 0) | |
1690 | break; | |
1691 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) | |
1692 | break; | |
1da177e4 | 1693 | } |
e005e804 | 1694 | return; |
1da177e4 | 1695 | out_error: |
e005e804 | 1696 | printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s" |
5d8515ca | 1697 | " with error %d\n", clp->cl_hostname, -status); |
5601a00d | 1698 | nfs4_end_drain_session(clp); |
e005e804 TM |
1699 | nfs4_clear_state_manager_bit(clp); |
1700 | } | |
1701 | ||
1702 | static int nfs4_run_state_manager(void *ptr) | |
1703 | { | |
1704 | struct nfs_client *clp = ptr; | |
1705 | ||
1706 | allow_signal(SIGKILL); | |
1707 | nfs4_state_manager(clp); | |
1708 | nfs_put_client(clp); | |
1709 | module_put_and_exit(0); | |
1710 | return 0; | |
1da177e4 LT |
1711 | } |
1712 | ||
1713 | /* | |
1714 | * Local variables: | |
1715 | * c-basic-offset: 8 | |
1716 | * End: | |
1717 | */ |