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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 LT |
42 | #include <linux/slab.h> |
43 | #include <linux/smp_lock.h> | |
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> |
1da177e4 LT |
49 | #include <linux/workqueue.h> |
50 | #include <linux/bitops.h> | |
51 | ||
4ce79717 | 52 | #include "nfs4_fs.h" |
1da177e4 LT |
53 | #include "callback.h" |
54 | #include "delegation.h" | |
24c8dbbb | 55 | #include "internal.h" |
1da177e4 LT |
56 | |
57 | #define OPENOWNER_POOL_SIZE 8 | |
58 | ||
4ce79717 | 59 | const nfs4_stateid zero_stateid; |
1da177e4 LT |
60 | |
61 | static LIST_HEAD(nfs4_clientid_list); | |
62 | ||
591d71cb | 63 | int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) |
1da177e4 | 64 | { |
f738f517 CL |
65 | unsigned short port; |
66 | int status; | |
67 | ||
68 | port = nfs_callback_tcpport; | |
69 | if (clp->cl_addr.ss_family == AF_INET6) | |
70 | port = nfs_callback_tcpport6; | |
71 | ||
72 | status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred); | |
1da177e4 | 73 | if (status == 0) |
286d7d6a | 74 | status = nfs4_proc_setclientid_confirm(clp, cred); |
1da177e4 LT |
75 | if (status == 0) |
76 | nfs4_schedule_state_renewal(clp); | |
77 | return status; | |
78 | } | |
79 | ||
a7b72103 | 80 | struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp) |
a2b2bb88 TM |
81 | { |
82 | struct rpc_cred *cred = NULL; | |
83 | ||
a2b2bb88 TM |
84 | if (clp->cl_machine_cred != NULL) |
85 | cred = get_rpccred(clp->cl_machine_cred); | |
a2b2bb88 TM |
86 | return cred; |
87 | } | |
88 | ||
89 | static void nfs4_clear_machine_cred(struct nfs_client *clp) | |
90 | { | |
91 | struct rpc_cred *cred; | |
92 | ||
93 | spin_lock(&clp->cl_lock); | |
94 | cred = clp->cl_machine_cred; | |
95 | clp->cl_machine_cred = NULL; | |
96 | spin_unlock(&clp->cl_lock); | |
97 | if (cred != NULL) | |
98 | put_rpccred(cred); | |
99 | } | |
100 | ||
6dc9d57a | 101 | struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp) |
b4454fe1 TM |
102 | { |
103 | struct nfs4_state_owner *sp; | |
9f958ab8 | 104 | struct rb_node *pos; |
b4454fe1 TM |
105 | struct rpc_cred *cred = NULL; |
106 | ||
9f958ab8 TM |
107 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
108 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
b4454fe1 TM |
109 | if (list_empty(&sp->so_states)) |
110 | continue; | |
111 | cred = get_rpccred(sp->so_cred); | |
112 | break; | |
113 | } | |
114 | return cred; | |
115 | } | |
116 | ||
b4b82607 AA |
117 | #if defined(CONFIG_NFS_V4_1) |
118 | ||
9430fb6b RL |
119 | static int nfs41_setup_state_renewal(struct nfs_client *clp) |
120 | { | |
121 | int status; | |
122 | struct nfs_fsinfo fsinfo; | |
123 | ||
124 | status = nfs4_proc_get_lease_time(clp, &fsinfo); | |
125 | if (status == 0) { | |
126 | /* Update lease time and schedule renewal */ | |
127 | spin_lock(&clp->cl_lock); | |
128 | clp->cl_lease_time = fsinfo.lease_time * HZ; | |
129 | clp->cl_last_renewal = jiffies; | |
130 | spin_unlock(&clp->cl_lock); | |
131 | ||
132 | nfs4_schedule_state_renewal(clp); | |
133 | } | |
134 | ||
135 | return status; | |
136 | } | |
137 | ||
5601a00d | 138 | static void nfs4_end_drain_session(struct nfs_client *clp) |
9dfdf404 | 139 | { |
5601a00d | 140 | struct nfs4_session *ses = clp->cl_session; |
689cf5c1 AB |
141 | int max_slots; |
142 | ||
143 | if (test_and_clear_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state)) { | |
144 | spin_lock(&ses->fc_slot_table.slot_tbl_lock); | |
145 | max_slots = ses->fc_slot_table.max_slots; | |
146 | while (max_slots--) { | |
147 | struct rpc_task *task; | |
148 | ||
149 | task = rpc_wake_up_next(&ses->fc_slot_table. | |
150 | slot_tbl_waitq); | |
151 | if (!task) | |
152 | break; | |
153 | rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED); | |
154 | } | |
155 | spin_unlock(&ses->fc_slot_table.slot_tbl_lock); | |
156 | } | |
9dfdf404 RL |
157 | } |
158 | ||
5601a00d | 159 | static int nfs4_begin_drain_session(struct nfs_client *clp) |
9dfdf404 | 160 | { |
5601a00d | 161 | struct nfs4_session *ses = clp->cl_session; |
9dfdf404 RL |
162 | struct nfs4_slot_table *tbl = &ses->fc_slot_table; |
163 | ||
164 | spin_lock(&tbl->slot_tbl_lock); | |
165 | set_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state); | |
166 | if (tbl->highest_used_slotid != -1) { | |
167 | INIT_COMPLETION(ses->complete); | |
168 | spin_unlock(&tbl->slot_tbl_lock); | |
169 | return wait_for_completion_interruptible(&ses->complete); | |
170 | } | |
171 | spin_unlock(&tbl->slot_tbl_lock); | |
172 | return 0; | |
173 | } | |
174 | ||
4d643d1d AA |
175 | int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) |
176 | { | |
177 | int status; | |
178 | ||
38045412 | 179 | nfs4_begin_drain_session(clp); |
4d643d1d | 180 | status = nfs4_proc_exchange_id(clp, cred); |
9430fb6b RL |
181 | if (status != 0) |
182 | goto out; | |
183 | status = nfs4_proc_create_session(clp); | |
184 | if (status != 0) | |
185 | goto out; | |
186 | nfs41_setup_state_renewal(clp); | |
187 | nfs_mark_client_ready(clp, NFS_CS_READY); | |
188 | out: | |
4d643d1d AA |
189 | return status; |
190 | } | |
191 | ||
b4b82607 AA |
192 | struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp) |
193 | { | |
194 | struct rpc_cred *cred; | |
195 | ||
196 | spin_lock(&clp->cl_lock); | |
197 | cred = nfs4_get_machine_cred_locked(clp); | |
198 | spin_unlock(&clp->cl_lock); | |
199 | return cred; | |
200 | } | |
201 | ||
202 | #endif /* CONFIG_NFS_V4_1 */ | |
203 | ||
a7b72103 | 204 | struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp) |
286d7d6a TM |
205 | { |
206 | struct nfs4_state_owner *sp; | |
9f958ab8 | 207 | struct rb_node *pos; |
a2b2bb88 | 208 | struct rpc_cred *cred; |
286d7d6a | 209 | |
6dc9d57a TM |
210 | spin_lock(&clp->cl_lock); |
211 | cred = nfs4_get_machine_cred_locked(clp); | |
a2b2bb88 TM |
212 | if (cred != NULL) |
213 | goto out; | |
9f958ab8 TM |
214 | pos = rb_first(&clp->cl_state_owners); |
215 | if (pos != NULL) { | |
216 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
a2b2bb88 | 217 | cred = get_rpccred(sp->so_cred); |
286d7d6a | 218 | } |
a2b2bb88 | 219 | out: |
6dc9d57a | 220 | spin_unlock(&clp->cl_lock); |
a2b2bb88 | 221 | return cred; |
286d7d6a TM |
222 | } |
223 | ||
9f958ab8 TM |
224 | static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new, |
225 | __u64 minval, int maxbits) | |
226 | { | |
227 | struct rb_node **p, *parent; | |
228 | struct nfs_unique_id *pos; | |
229 | __u64 mask = ~0ULL; | |
230 | ||
231 | if (maxbits < 64) | |
232 | mask = (1ULL << maxbits) - 1ULL; | |
233 | ||
234 | /* Ensure distribution is more or less flat */ | |
235 | get_random_bytes(&new->id, sizeof(new->id)); | |
236 | new->id &= mask; | |
237 | if (new->id < minval) | |
238 | new->id += minval; | |
239 | retry: | |
240 | p = &root->rb_node; | |
241 | parent = NULL; | |
242 | ||
243 | while (*p != NULL) { | |
244 | parent = *p; | |
245 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); | |
246 | ||
247 | if (new->id < pos->id) | |
248 | p = &(*p)->rb_left; | |
249 | else if (new->id > pos->id) | |
250 | p = &(*p)->rb_right; | |
251 | else | |
252 | goto id_exists; | |
253 | } | |
254 | rb_link_node(&new->rb_node, parent, p); | |
255 | rb_insert_color(&new->rb_node, root); | |
256 | return; | |
257 | id_exists: | |
258 | for (;;) { | |
259 | new->id++; | |
260 | if (new->id < minval || (new->id & mask) != new->id) { | |
261 | new->id = minval; | |
262 | break; | |
263 | } | |
264 | parent = rb_next(parent); | |
265 | if (parent == NULL) | |
266 | break; | |
267 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); | |
268 | if (new->id < pos->id) | |
269 | break; | |
270 | } | |
271 | goto retry; | |
272 | } | |
273 | ||
274 | static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id) | |
275 | { | |
276 | rb_erase(&id->rb_node, root); | |
277 | } | |
278 | ||
1da177e4 | 279 | static struct nfs4_state_owner * |
6f2e64d3 | 280 | nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred) |
1da177e4 | 281 | { |
6f2e64d3 | 282 | struct nfs_client *clp = server->nfs_client; |
9f958ab8 TM |
283 | struct rb_node **p = &clp->cl_state_owners.rb_node, |
284 | *parent = NULL; | |
1da177e4 LT |
285 | struct nfs4_state_owner *sp, *res = NULL; |
286 | ||
9f958ab8 TM |
287 | while (*p != NULL) { |
288 | parent = *p; | |
289 | sp = rb_entry(parent, struct nfs4_state_owner, so_client_node); | |
290 | ||
6f2e64d3 TM |
291 | if (server < sp->so_server) { |
292 | p = &parent->rb_left; | |
293 | continue; | |
294 | } | |
295 | if (server > sp->so_server) { | |
296 | p = &parent->rb_right; | |
297 | continue; | |
298 | } | |
9f958ab8 TM |
299 | if (cred < sp->so_cred) |
300 | p = &parent->rb_left; | |
301 | else if (cred > sp->so_cred) | |
302 | p = &parent->rb_right; | |
303 | else { | |
304 | atomic_inc(&sp->so_count); | |
305 | res = sp; | |
306 | break; | |
307 | } | |
1da177e4 LT |
308 | } |
309 | return res; | |
310 | } | |
311 | ||
9f958ab8 TM |
312 | static struct nfs4_state_owner * |
313 | nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new) | |
314 | { | |
315 | struct rb_node **p = &clp->cl_state_owners.rb_node, | |
316 | *parent = NULL; | |
317 | struct nfs4_state_owner *sp; | |
318 | ||
319 | while (*p != NULL) { | |
320 | parent = *p; | |
321 | sp = rb_entry(parent, struct nfs4_state_owner, so_client_node); | |
322 | ||
6f2e64d3 TM |
323 | if (new->so_server < sp->so_server) { |
324 | p = &parent->rb_left; | |
325 | continue; | |
326 | } | |
327 | if (new->so_server > sp->so_server) { | |
328 | p = &parent->rb_right; | |
329 | continue; | |
330 | } | |
9f958ab8 TM |
331 | if (new->so_cred < sp->so_cred) |
332 | p = &parent->rb_left; | |
333 | else if (new->so_cred > sp->so_cred) | |
334 | p = &parent->rb_right; | |
335 | else { | |
336 | atomic_inc(&sp->so_count); | |
337 | return sp; | |
338 | } | |
339 | } | |
340 | nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64); | |
341 | rb_link_node(&new->so_client_node, parent, p); | |
342 | rb_insert_color(&new->so_client_node, &clp->cl_state_owners); | |
343 | return new; | |
344 | } | |
345 | ||
346 | static void | |
347 | nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp) | |
348 | { | |
349 | if (!RB_EMPTY_NODE(&sp->so_client_node)) | |
350 | rb_erase(&sp->so_client_node, &clp->cl_state_owners); | |
351 | nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id); | |
352 | } | |
353 | ||
1da177e4 LT |
354 | /* |
355 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to | |
356 | * create a new state_owner. | |
357 | * | |
358 | */ | |
359 | static struct nfs4_state_owner * | |
360 | nfs4_alloc_state_owner(void) | |
361 | { | |
362 | struct nfs4_state_owner *sp; | |
363 | ||
cee54fc9 | 364 | sp = kzalloc(sizeof(*sp),GFP_KERNEL); |
1da177e4 LT |
365 | if (!sp) |
366 | return NULL; | |
ec073428 | 367 | spin_lock_init(&sp->so_lock); |
1da177e4 LT |
368 | INIT_LIST_HEAD(&sp->so_states); |
369 | INIT_LIST_HEAD(&sp->so_delegations); | |
cee54fc9 TM |
370 | rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue"); |
371 | sp->so_seqid.sequence = &sp->so_sequence; | |
372 | spin_lock_init(&sp->so_sequence.lock); | |
373 | INIT_LIST_HEAD(&sp->so_sequence.list); | |
1da177e4 LT |
374 | atomic_set(&sp->so_count, 1); |
375 | return sp; | |
376 | } | |
377 | ||
1d2e88e7 | 378 | static void |
1da177e4 LT |
379 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) |
380 | { | |
9f958ab8 TM |
381 | if (!RB_EMPTY_NODE(&sp->so_client_node)) { |
382 | struct nfs_client *clp = sp->so_client; | |
383 | ||
384 | spin_lock(&clp->cl_lock); | |
385 | rb_erase(&sp->so_client_node, &clp->cl_state_owners); | |
386 | RB_CLEAR_NODE(&sp->so_client_node); | |
387 | spin_unlock(&clp->cl_lock); | |
388 | } | |
1da177e4 LT |
389 | } |
390 | ||
1da177e4 LT |
391 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred) |
392 | { | |
7539bbab | 393 | struct nfs_client *clp = server->nfs_client; |
1da177e4 LT |
394 | struct nfs4_state_owner *sp, *new; |
395 | ||
1da177e4 | 396 | spin_lock(&clp->cl_lock); |
6f2e64d3 | 397 | sp = nfs4_find_state_owner(server, cred); |
1da177e4 | 398 | spin_unlock(&clp->cl_lock); |
1da177e4 LT |
399 | if (sp != NULL) |
400 | return sp; | |
9f958ab8 TM |
401 | new = nfs4_alloc_state_owner(); |
402 | if (new == NULL) | |
403 | return NULL; | |
404 | new->so_client = clp; | |
6f2e64d3 | 405 | new->so_server = server; |
9f958ab8 TM |
406 | new->so_cred = cred; |
407 | spin_lock(&clp->cl_lock); | |
408 | sp = nfs4_insert_state_owner(clp, new); | |
409 | spin_unlock(&clp->cl_lock); | |
410 | if (sp == new) | |
411 | get_rpccred(cred); | |
f6a1cc89 TM |
412 | else { |
413 | rpc_destroy_wait_queue(&new->so_sequence.wait); | |
9f958ab8 | 414 | kfree(new); |
f6a1cc89 | 415 | } |
9f958ab8 | 416 | return sp; |
1da177e4 LT |
417 | } |
418 | ||
1da177e4 LT |
419 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) |
420 | { | |
adfa6f98 | 421 | struct nfs_client *clp = sp->so_client; |
1da177e4 LT |
422 | struct rpc_cred *cred = sp->so_cred; |
423 | ||
424 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
425 | return; | |
9f958ab8 | 426 | nfs4_remove_state_owner(clp, sp); |
1da177e4 | 427 | spin_unlock(&clp->cl_lock); |
f6a1cc89 | 428 | rpc_destroy_wait_queue(&sp->so_sequence.wait); |
1da177e4 LT |
429 | put_rpccred(cred); |
430 | kfree(sp); | |
431 | } | |
432 | ||
433 | static struct nfs4_state * | |
434 | nfs4_alloc_open_state(void) | |
435 | { | |
436 | struct nfs4_state *state; | |
437 | ||
e7616923 | 438 | state = kzalloc(sizeof(*state), GFP_KERNEL); |
1da177e4 LT |
439 | if (!state) |
440 | return NULL; | |
1da177e4 LT |
441 | atomic_set(&state->count, 1); |
442 | INIT_LIST_HEAD(&state->lock_states); | |
8d0a8a9d | 443 | spin_lock_init(&state->state_lock); |
8bda4e4c | 444 | seqlock_init(&state->seqlock); |
1da177e4 LT |
445 | return state; |
446 | } | |
447 | ||
4cecb76f | 448 | void |
dc0b027d | 449 | nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) |
4cecb76f | 450 | { |
dc0b027d | 451 | if (state->state == fmode) |
4cecb76f TM |
452 | return; |
453 | /* NB! List reordering - see the reclaim code for why. */ | |
dc0b027d TM |
454 | if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { |
455 | if (fmode & FMODE_WRITE) | |
4cecb76f TM |
456 | list_move(&state->open_states, &state->owner->so_states); |
457 | else | |
458 | list_move_tail(&state->open_states, &state->owner->so_states); | |
459 | } | |
dc0b027d | 460 | state->state = fmode; |
4cecb76f TM |
461 | } |
462 | ||
1da177e4 LT |
463 | static struct nfs4_state * |
464 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
465 | { | |
466 | struct nfs_inode *nfsi = NFS_I(inode); | |
467 | struct nfs4_state *state; | |
468 | ||
469 | list_for_each_entry(state, &nfsi->open_states, inode_states) { | |
1c816efa | 470 | if (state->owner != owner) |
1da177e4 | 471 | continue; |
1c816efa | 472 | if (atomic_inc_not_zero(&state->count)) |
1da177e4 | 473 | return state; |
1da177e4 LT |
474 | } |
475 | return NULL; | |
476 | } | |
477 | ||
1da177e4 LT |
478 | static void |
479 | nfs4_free_open_state(struct nfs4_state *state) | |
480 | { | |
481 | kfree(state); | |
482 | } | |
483 | ||
484 | struct nfs4_state * | |
485 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
486 | { | |
487 | struct nfs4_state *state, *new; | |
488 | struct nfs_inode *nfsi = NFS_I(inode); | |
489 | ||
490 | spin_lock(&inode->i_lock); | |
491 | state = __nfs4_find_state_byowner(inode, owner); | |
492 | spin_unlock(&inode->i_lock); | |
493 | if (state) | |
494 | goto out; | |
495 | new = nfs4_alloc_open_state(); | |
ec073428 | 496 | spin_lock(&owner->so_lock); |
1da177e4 LT |
497 | spin_lock(&inode->i_lock); |
498 | state = __nfs4_find_state_byowner(inode, owner); | |
499 | if (state == NULL && new != NULL) { | |
500 | state = new; | |
1da177e4 LT |
501 | state->owner = owner; |
502 | atomic_inc(&owner->so_count); | |
503 | list_add(&state->inode_states, &nfsi->open_states); | |
504 | state->inode = igrab(inode); | |
505 | spin_unlock(&inode->i_lock); | |
ec073428 TM |
506 | /* Note: The reclaim code dictates that we add stateless |
507 | * and read-only stateids to the end of the list */ | |
508 | list_add_tail(&state->open_states, &owner->so_states); | |
509 | spin_unlock(&owner->so_lock); | |
1da177e4 LT |
510 | } else { |
511 | spin_unlock(&inode->i_lock); | |
ec073428 | 512 | spin_unlock(&owner->so_lock); |
1da177e4 LT |
513 | if (new) |
514 | nfs4_free_open_state(new); | |
515 | } | |
516 | out: | |
517 | return state; | |
518 | } | |
519 | ||
1da177e4 LT |
520 | void nfs4_put_open_state(struct nfs4_state *state) |
521 | { | |
522 | struct inode *inode = state->inode; | |
523 | struct nfs4_state_owner *owner = state->owner; | |
524 | ||
ec073428 | 525 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
1da177e4 | 526 | return; |
ec073428 | 527 | spin_lock(&inode->i_lock); |
ba683031 | 528 | list_del(&state->inode_states); |
1da177e4 | 529 | list_del(&state->open_states); |
ec073428 TM |
530 | spin_unlock(&inode->i_lock); |
531 | spin_unlock(&owner->so_lock); | |
1da177e4 | 532 | iput(inode); |
1da177e4 LT |
533 | nfs4_free_open_state(state); |
534 | nfs4_put_state_owner(owner); | |
535 | } | |
536 | ||
537 | /* | |
83c9d41e | 538 | * Close the current file. |
1da177e4 | 539 | */ |
dc0b027d | 540 | static void __nfs4_close(struct path *path, struct nfs4_state *state, fmode_t fmode, int wait) |
1da177e4 | 541 | { |
1da177e4 | 542 | struct nfs4_state_owner *owner = state->owner; |
003707c7 | 543 | int call_close = 0; |
dc0b027d | 544 | fmode_t newstate; |
1da177e4 LT |
545 | |
546 | atomic_inc(&owner->so_count); | |
1da177e4 | 547 | /* Protect against nfs4_find_state() */ |
ec073428 | 548 | spin_lock(&owner->so_lock); |
dc0b027d | 549 | switch (fmode & (FMODE_READ | FMODE_WRITE)) { |
e7616923 TM |
550 | case FMODE_READ: |
551 | state->n_rdonly--; | |
552 | break; | |
553 | case FMODE_WRITE: | |
554 | state->n_wronly--; | |
555 | break; | |
556 | case FMODE_READ|FMODE_WRITE: | |
557 | state->n_rdwr--; | |
558 | } | |
003707c7 | 559 | newstate = FMODE_READ|FMODE_WRITE; |
e7616923 | 560 | if (state->n_rdwr == 0) { |
003707c7 | 561 | if (state->n_rdonly == 0) { |
e7616923 | 562 | newstate &= ~FMODE_READ; |
003707c7 TM |
563 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
564 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
565 | } | |
566 | if (state->n_wronly == 0) { | |
e7616923 | 567 | newstate &= ~FMODE_WRITE; |
003707c7 TM |
568 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
569 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
570 | } | |
571 | if (newstate == 0) | |
572 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
e7616923 | 573 | } |
003707c7 | 574 | nfs4_state_set_mode_locked(state, newstate); |
ec073428 | 575 | spin_unlock(&owner->so_lock); |
4cecb76f | 576 | |
003707c7 | 577 | if (!call_close) { |
b39e625b TM |
578 | nfs4_put_open_state(state); |
579 | nfs4_put_state_owner(owner); | |
580 | } else | |
a49c3c77 TM |
581 | nfs4_do_close(path, state, wait); |
582 | } | |
583 | ||
dc0b027d | 584 | void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 585 | { |
dc0b027d | 586 | __nfs4_close(path, state, fmode, 0); |
a49c3c77 TM |
587 | } |
588 | ||
dc0b027d | 589 | void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 590 | { |
dc0b027d | 591 | __nfs4_close(path, state, fmode, 1); |
1da177e4 LT |
592 | } |
593 | ||
594 | /* | |
595 | * Search the state->lock_states for an existing lock_owner | |
596 | * that is compatible with current->files | |
597 | */ | |
598 | static struct nfs4_lock_state * | |
599 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) | |
600 | { | |
601 | struct nfs4_lock_state *pos; | |
602 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
603 | if (pos->ls_owner != fl_owner) | |
604 | continue; | |
605 | atomic_inc(&pos->ls_count); | |
606 | return pos; | |
607 | } | |
608 | return NULL; | |
609 | } | |
610 | ||
1da177e4 LT |
611 | /* |
612 | * Return a compatible lock_state. If no initialized lock_state structure | |
613 | * exists, return an uninitialized one. | |
614 | * | |
1da177e4 LT |
615 | */ |
616 | static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) | |
617 | { | |
618 | struct nfs4_lock_state *lsp; | |
adfa6f98 | 619 | struct nfs_client *clp = state->owner->so_client; |
1da177e4 | 620 | |
cee54fc9 | 621 | lsp = kzalloc(sizeof(*lsp), GFP_KERNEL); |
1da177e4 LT |
622 | if (lsp == NULL) |
623 | return NULL; | |
d0dc3701 TM |
624 | rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue"); |
625 | spin_lock_init(&lsp->ls_sequence.lock); | |
626 | INIT_LIST_HEAD(&lsp->ls_sequence.list); | |
627 | lsp->ls_seqid.sequence = &lsp->ls_sequence; | |
1da177e4 | 628 | atomic_set(&lsp->ls_count, 1); |
b64aec8d | 629 | lsp->ls_state = state; |
1da177e4 | 630 | lsp->ls_owner = fl_owner; |
1da177e4 | 631 | spin_lock(&clp->cl_lock); |
9f958ab8 | 632 | nfs_alloc_unique_id(&clp->cl_lockowner_id, &lsp->ls_id, 1, 64); |
1da177e4 | 633 | spin_unlock(&clp->cl_lock); |
8d0a8a9d | 634 | INIT_LIST_HEAD(&lsp->ls_locks); |
1da177e4 LT |
635 | return lsp; |
636 | } | |
637 | ||
9f958ab8 TM |
638 | static void nfs4_free_lock_state(struct nfs4_lock_state *lsp) |
639 | { | |
640 | struct nfs_client *clp = lsp->ls_state->owner->so_client; | |
641 | ||
642 | spin_lock(&clp->cl_lock); | |
643 | nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id); | |
644 | spin_unlock(&clp->cl_lock); | |
f6a1cc89 | 645 | rpc_destroy_wait_queue(&lsp->ls_sequence.wait); |
9f958ab8 TM |
646 | kfree(lsp); |
647 | } | |
648 | ||
1da177e4 LT |
649 | /* |
650 | * Return a compatible lock_state. If no initialized lock_state structure | |
651 | * exists, return an uninitialized one. | |
652 | * | |
1da177e4 | 653 | */ |
8d0a8a9d | 654 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner) |
1da177e4 | 655 | { |
8d0a8a9d | 656 | struct nfs4_lock_state *lsp, *new = NULL; |
1da177e4 | 657 | |
8d0a8a9d TM |
658 | for(;;) { |
659 | spin_lock(&state->state_lock); | |
660 | lsp = __nfs4_find_lock_state(state, owner); | |
661 | if (lsp != NULL) | |
662 | break; | |
663 | if (new != NULL) { | |
8d0a8a9d TM |
664 | list_add(&new->ls_locks, &state->lock_states); |
665 | set_bit(LK_STATE_IN_USE, &state->flags); | |
666 | lsp = new; | |
667 | new = NULL; | |
668 | break; | |
669 | } | |
670 | spin_unlock(&state->state_lock); | |
671 | new = nfs4_alloc_lock_state(state, owner); | |
672 | if (new == NULL) | |
673 | return NULL; | |
674 | } | |
675 | spin_unlock(&state->state_lock); | |
9f958ab8 TM |
676 | if (new != NULL) |
677 | nfs4_free_lock_state(new); | |
1da177e4 LT |
678 | return lsp; |
679 | } | |
680 | ||
681 | /* | |
8d0a8a9d TM |
682 | * Release reference to lock_state, and free it if we see that |
683 | * it is no longer in use | |
1da177e4 | 684 | */ |
faf5f49c | 685 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
1da177e4 | 686 | { |
8d0a8a9d | 687 | struct nfs4_state *state; |
1da177e4 | 688 | |
8d0a8a9d TM |
689 | if (lsp == NULL) |
690 | return; | |
691 | state = lsp->ls_state; | |
692 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) | |
693 | return; | |
694 | list_del(&lsp->ls_locks); | |
695 | if (list_empty(&state->lock_states)) | |
696 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
697 | spin_unlock(&state->state_lock); | |
9f958ab8 | 698 | nfs4_free_lock_state(lsp); |
1da177e4 LT |
699 | } |
700 | ||
8d0a8a9d | 701 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
1da177e4 | 702 | { |
8d0a8a9d | 703 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
1da177e4 | 704 | |
8d0a8a9d TM |
705 | dst->fl_u.nfs4_fl.owner = lsp; |
706 | atomic_inc(&lsp->ls_count); | |
707 | } | |
1da177e4 | 708 | |
8d0a8a9d | 709 | static void nfs4_fl_release_lock(struct file_lock *fl) |
1da177e4 | 710 | { |
8d0a8a9d | 711 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
1da177e4 LT |
712 | } |
713 | ||
6aed6285 | 714 | static const struct file_lock_operations nfs4_fl_lock_ops = { |
8d0a8a9d TM |
715 | .fl_copy_lock = nfs4_fl_copy_lock, |
716 | .fl_release_private = nfs4_fl_release_lock, | |
717 | }; | |
718 | ||
719 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
1da177e4 | 720 | { |
8d0a8a9d TM |
721 | struct nfs4_lock_state *lsp; |
722 | ||
723 | if (fl->fl_ops != NULL) | |
724 | return 0; | |
725 | lsp = nfs4_get_lock_state(state, fl->fl_owner); | |
726 | if (lsp == NULL) | |
727 | return -ENOMEM; | |
728 | fl->fl_u.nfs4_fl.owner = lsp; | |
729 | fl->fl_ops = &nfs4_fl_lock_ops; | |
730 | return 0; | |
1da177e4 LT |
731 | } |
732 | ||
8d0a8a9d TM |
733 | /* |
734 | * Byte-range lock aware utility to initialize the stateid of read/write | |
735 | * requests. | |
1da177e4 | 736 | */ |
8d0a8a9d | 737 | void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner) |
1da177e4 | 738 | { |
8d0a8a9d | 739 | struct nfs4_lock_state *lsp; |
8bda4e4c | 740 | int seq; |
1da177e4 | 741 | |
8bda4e4c TM |
742 | do { |
743 | seq = read_seqbegin(&state->seqlock); | |
744 | memcpy(dst, &state->stateid, sizeof(*dst)); | |
745 | } while (read_seqretry(&state->seqlock, seq)); | |
8d0a8a9d TM |
746 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
747 | return; | |
1da177e4 | 748 | |
8d0a8a9d TM |
749 | spin_lock(&state->state_lock); |
750 | lsp = __nfs4_find_lock_state(state, fl_owner); | |
751 | if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) | |
752 | memcpy(dst, &lsp->ls_stateid, sizeof(*dst)); | |
753 | spin_unlock(&state->state_lock); | |
1da177e4 LT |
754 | nfs4_put_lock_state(lsp); |
755 | } | |
756 | ||
cee54fc9 TM |
757 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter) |
758 | { | |
cee54fc9 TM |
759 | struct nfs_seqid *new; |
760 | ||
761 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
762 | if (new != NULL) { | |
763 | new->sequence = counter; | |
2f74c0a0 | 764 | INIT_LIST_HEAD(&new->list); |
cee54fc9 TM |
765 | } |
766 | return new; | |
767 | } | |
768 | ||
72211dbe | 769 | void nfs_release_seqid(struct nfs_seqid *seqid) |
1da177e4 | 770 | { |
2f74c0a0 TM |
771 | if (!list_empty(&seqid->list)) { |
772 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
cee54fc9 | 773 | |
2f74c0a0 | 774 | spin_lock(&sequence->lock); |
72211dbe | 775 | list_del_init(&seqid->list); |
2f74c0a0 TM |
776 | spin_unlock(&sequence->lock); |
777 | rpc_wake_up(&sequence->wait); | |
778 | } | |
72211dbe TM |
779 | } |
780 | ||
781 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
782 | { | |
783 | nfs_release_seqid(seqid); | |
cee54fc9 | 784 | kfree(seqid); |
1da177e4 LT |
785 | } |
786 | ||
787 | /* | |
cee54fc9 TM |
788 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
789 | * failed with a seqid incrementing error - | |
790 | * see comments nfs_fs.h:seqid_mutating_error() | |
791 | */ | |
88d90939 | 792 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
cee54fc9 | 793 | { |
2f74c0a0 | 794 | BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid); |
cee54fc9 TM |
795 | switch (status) { |
796 | case 0: | |
797 | break; | |
798 | case -NFS4ERR_BAD_SEQID: | |
6f43ddcc TM |
799 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
800 | return; | |
801 | printk(KERN_WARNING "NFS: v4 server returned a bad" | |
497799e7 DM |
802 | " sequence-id error on an" |
803 | " unconfirmed sequence %p!\n", | |
6f43ddcc | 804 | seqid->sequence); |
cee54fc9 TM |
805 | case -NFS4ERR_STALE_CLIENTID: |
806 | case -NFS4ERR_STALE_STATEID: | |
807 | case -NFS4ERR_BAD_STATEID: | |
808 | case -NFS4ERR_BADXDR: | |
809 | case -NFS4ERR_RESOURCE: | |
810 | case -NFS4ERR_NOFILEHANDLE: | |
811 | /* Non-seqid mutating errors */ | |
812 | return; | |
813 | }; | |
814 | /* | |
815 | * Note: no locking needed as we are guaranteed to be first | |
816 | * on the sequence list | |
817 | */ | |
818 | seqid->sequence->counter++; | |
819 | } | |
820 | ||
821 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
822 | { | |
34dc1ad7 BH |
823 | struct nfs4_state_owner *sp = container_of(seqid->sequence, |
824 | struct nfs4_state_owner, so_seqid); | |
825 | struct nfs_server *server = sp->so_server; | |
826 | ||
827 | if (status == -NFS4ERR_BAD_SEQID) | |
1da177e4 | 828 | nfs4_drop_state_owner(sp); |
34dc1ad7 BH |
829 | if (!nfs4_has_session(server->nfs_client)) |
830 | nfs_increment_seqid(status, seqid); | |
cee54fc9 TM |
831 | } |
832 | ||
833 | /* | |
cee54fc9 TM |
834 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
835 | * failed with a seqid incrementing error - | |
836 | * see comments nfs_fs.h:seqid_mutating_error() | |
837 | */ | |
838 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
839 | { | |
88d90939 | 840 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
841 | } |
842 | ||
843 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
844 | { | |
845 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
846 | int status = 0; | |
847 | ||
848 | spin_lock(&sequence->lock); | |
2f74c0a0 TM |
849 | if (list_empty(&seqid->list)) |
850 | list_add_tail(&seqid->list, &sequence->list); | |
851 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) | |
852 | goto unlock; | |
5d00837b | 853 | rpc_sleep_on(&sequence->wait, task, NULL); |
2f74c0a0 TM |
854 | status = -EAGAIN; |
855 | unlock: | |
cee54fc9 TM |
856 | spin_unlock(&sequence->lock); |
857 | return status; | |
1da177e4 LT |
858 | } |
859 | ||
e005e804 | 860 | static int nfs4_run_state_manager(void *); |
1da177e4 | 861 | |
e005e804 | 862 | static void nfs4_clear_state_manager_bit(struct nfs_client *clp) |
433fbe4c TM |
863 | { |
864 | smp_mb__before_clear_bit(); | |
e005e804 | 865 | clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); |
433fbe4c | 866 | smp_mb__after_clear_bit(); |
e005e804 | 867 | wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); |
433fbe4c TM |
868 | rpc_wake_up(&clp->cl_rpcwaitq); |
869 | } | |
870 | ||
1da177e4 | 871 | /* |
e005e804 | 872 | * Schedule the nfs_client asynchronous state management routine |
1da177e4 | 873 | */ |
b0d3ded1 | 874 | void nfs4_schedule_state_manager(struct nfs_client *clp) |
1da177e4 | 875 | { |
5043e900 | 876 | struct task_struct *task; |
1da177e4 | 877 | |
e005e804 TM |
878 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
879 | return; | |
5043e900 TM |
880 | __module_get(THIS_MODULE); |
881 | atomic_inc(&clp->cl_count); | |
e005e804 | 882 | task = kthread_run(nfs4_run_state_manager, clp, "%s-manager", |
5d8515ca CL |
883 | rpc_peeraddr2str(clp->cl_rpcclient, |
884 | RPC_DISPLAY_ADDR)); | |
5043e900 TM |
885 | if (!IS_ERR(task)) |
886 | return; | |
e005e804 | 887 | nfs4_clear_state_manager_bit(clp); |
24c8dbbb | 888 | nfs_put_client(clp); |
5043e900 | 889 | module_put(THIS_MODULE); |
1da177e4 LT |
890 | } |
891 | ||
892 | /* | |
893 | * Schedule a state recovery attempt | |
894 | */ | |
adfa6f98 | 895 | void nfs4_schedule_state_recovery(struct nfs_client *clp) |
1da177e4 LT |
896 | { |
897 | if (!clp) | |
898 | return; | |
e598d843 TM |
899 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
900 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
e005e804 | 901 | nfs4_schedule_state_manager(clp); |
1da177e4 LT |
902 | } |
903 | ||
a2c0b9e2 | 904 | int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
905 | { |
906 | ||
907 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
908 | /* Don't recover state that expired before the reboot */ | |
909 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { | |
910 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
911 | return 0; | |
912 | } | |
7eff03ae | 913 | set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); |
b79a4a1b TM |
914 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
915 | return 1; | |
916 | } | |
917 | ||
9e33bed5 | 918 | int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
919 | { |
920 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); | |
921 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
7eff03ae | 922 | set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); |
b79a4a1b TM |
923 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
924 | return 1; | |
925 | } | |
926 | ||
02860014 | 927 | static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
928 | { |
929 | struct inode *inode = state->inode; | |
19e03c57 | 930 | struct nfs_inode *nfsi = NFS_I(inode); |
1da177e4 LT |
931 | struct file_lock *fl; |
932 | int status = 0; | |
933 | ||
3f09df70 TM |
934 | if (inode->i_flock == NULL) |
935 | return 0; | |
936 | ||
937 | /* Guard against delegation returns and new lock/unlock calls */ | |
19e03c57 | 938 | down_write(&nfsi->rwsem); |
3f09df70 TM |
939 | /* Protect inode->i_flock using the BKL */ |
940 | lock_kernel(); | |
90dc7d27 | 941 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
43b2a33a | 942 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
1da177e4 | 943 | continue; |
cd3758e3 | 944 | if (nfs_file_open_context(fl->fl_file)->state != state) |
1da177e4 | 945 | continue; |
3f09df70 | 946 | unlock_kernel(); |
1da177e4 | 947 | status = ops->recover_lock(state, fl); |
1da177e4 | 948 | switch (status) { |
965b5d67 TM |
949 | case 0: |
950 | break; | |
951 | case -ESTALE: | |
952 | case -NFS4ERR_ADMIN_REVOKED: | |
953 | case -NFS4ERR_STALE_STATEID: | |
954 | case -NFS4ERR_BAD_STATEID: | |
955 | case -NFS4ERR_EXPIRED: | |
956 | case -NFS4ERR_NO_GRACE: | |
957 | case -NFS4ERR_STALE_CLIENTID: | |
9c4c761a TM |
958 | case -NFS4ERR_BADSESSION: |
959 | case -NFS4ERR_BADSLOT: | |
960 | case -NFS4ERR_BAD_HIGH_SLOT: | |
961 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
965b5d67 | 962 | goto out; |
1da177e4 LT |
963 | default: |
964 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
3110ff80 | 965 | __func__, status); |
965b5d67 TM |
966 | case -ENOMEM: |
967 | case -NFS4ERR_DENIED: | |
1da177e4 LT |
968 | case -NFS4ERR_RECLAIM_BAD: |
969 | case -NFS4ERR_RECLAIM_CONFLICT: | |
43b2a33a | 970 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
965b5d67 | 971 | status = 0; |
1da177e4 | 972 | } |
3f09df70 | 973 | lock_kernel(); |
1da177e4 | 974 | } |
3f09df70 | 975 | unlock_kernel(); |
965b5d67 | 976 | out: |
19e03c57 | 977 | up_write(&nfsi->rwsem); |
1da177e4 LT |
978 | return status; |
979 | } | |
980 | ||
02860014 | 981 | static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
982 | { |
983 | struct nfs4_state *state; | |
984 | struct nfs4_lock_state *lock; | |
985 | int status = 0; | |
986 | ||
987 | /* Note: we rely on the sp->so_states list being ordered | |
988 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
989 | * states first. | |
990 | * This is needed to ensure that the server won't give us any | |
991 | * read delegations that we have to return if, say, we are | |
992 | * recovering after a network partition or a reboot from a | |
993 | * server that doesn't support a grace period. | |
994 | */ | |
fe1d8195 TM |
995 | restart: |
996 | spin_lock(&sp->so_lock); | |
1da177e4 | 997 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
998 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) |
999 | continue; | |
1da177e4 LT |
1000 | if (state->state == 0) |
1001 | continue; | |
fe1d8195 TM |
1002 | atomic_inc(&state->count); |
1003 | spin_unlock(&sp->so_lock); | |
1da177e4 | 1004 | status = ops->recover_open(sp, state); |
1da177e4 | 1005 | if (status >= 0) { |
02860014 TM |
1006 | status = nfs4_reclaim_locks(state, ops); |
1007 | if (status >= 0) { | |
1008 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
1009 | if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) | |
1010 | printk("%s: Lock reclaim failed!\n", | |
3110ff80 | 1011 | __func__); |
02860014 | 1012 | } |
fe1d8195 TM |
1013 | nfs4_put_open_state(state); |
1014 | goto restart; | |
1da177e4 | 1015 | } |
1da177e4 LT |
1016 | } |
1017 | switch (status) { | |
1018 | default: | |
1019 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
3110ff80 | 1020 | __func__, status); |
1da177e4 | 1021 | case -ENOENT: |
965b5d67 | 1022 | case -ENOMEM: |
b79a4a1b | 1023 | case -ESTALE: |
1da177e4 LT |
1024 | /* |
1025 | * Open state on this file cannot be recovered | |
1026 | * All we can do is revert to using the zero stateid. | |
1027 | */ | |
1028 | memset(state->stateid.data, 0, | |
1029 | sizeof(state->stateid.data)); | |
1030 | /* Mark the file as being 'closed' */ | |
1031 | state->state = 0; | |
1032 | break; | |
965b5d67 TM |
1033 | case -NFS4ERR_ADMIN_REVOKED: |
1034 | case -NFS4ERR_STALE_STATEID: | |
1035 | case -NFS4ERR_BAD_STATEID: | |
b79a4a1b TM |
1036 | case -NFS4ERR_RECLAIM_BAD: |
1037 | case -NFS4ERR_RECLAIM_CONFLICT: | |
1038 | nfs4_state_mark_reclaim_nograce(sp->so_client, state); | |
1039 | break; | |
1da177e4 LT |
1040 | case -NFS4ERR_EXPIRED: |
1041 | case -NFS4ERR_NO_GRACE: | |
b79a4a1b | 1042 | nfs4_state_mark_reclaim_nograce(sp->so_client, state); |
1da177e4 | 1043 | case -NFS4ERR_STALE_CLIENTID: |
9c4c761a TM |
1044 | case -NFS4ERR_BADSESSION: |
1045 | case -NFS4ERR_BADSLOT: | |
1046 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1047 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1da177e4 LT |
1048 | goto out_err; |
1049 | } | |
fe1d8195 TM |
1050 | nfs4_put_open_state(state); |
1051 | goto restart; | |
1da177e4 | 1052 | } |
fe1d8195 | 1053 | spin_unlock(&sp->so_lock); |
1da177e4 LT |
1054 | return 0; |
1055 | out_err: | |
fe1d8195 | 1056 | nfs4_put_open_state(state); |
1da177e4 LT |
1057 | return status; |
1058 | } | |
1059 | ||
b79a4a1b TM |
1060 | static void nfs4_clear_open_state(struct nfs4_state *state) |
1061 | { | |
1062 | struct nfs4_lock_state *lock; | |
1063 | ||
1064 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
1065 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); | |
1066 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); | |
1067 | clear_bit(NFS_O_RDWR_STATE, &state->flags); | |
1068 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
b79a4a1b TM |
1069 | lock->ls_seqid.flags = 0; |
1070 | lock->ls_flags &= ~NFS_LOCK_INITIALIZED; | |
1071 | } | |
1072 | } | |
1073 | ||
1074 | static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
cee54fc9 TM |
1075 | { |
1076 | struct nfs4_state_owner *sp; | |
9f958ab8 | 1077 | struct rb_node *pos; |
cee54fc9 | 1078 | struct nfs4_state *state; |
cee54fc9 TM |
1079 | |
1080 | /* Reset all sequence ids to zero */ | |
9f958ab8 TM |
1081 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
1082 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
cee54fc9 | 1083 | sp->so_seqid.flags = 0; |
ec073428 | 1084 | spin_lock(&sp->so_lock); |
cee54fc9 | 1085 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1086 | if (mark_reclaim(clp, state)) |
1087 | nfs4_clear_open_state(state); | |
cee54fc9 | 1088 | } |
ec073428 | 1089 | spin_unlock(&sp->so_lock); |
cee54fc9 TM |
1090 | } |
1091 | } | |
1092 | ||
b79a4a1b TM |
1093 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
1094 | { | |
1095 | /* Mark all delegations for reclaim */ | |
1096 | nfs_delegation_mark_reclaim(clp); | |
1097 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); | |
1098 | } | |
1099 | ||
fce5c838 RL |
1100 | static void nfs4_reclaim_complete(struct nfs_client *clp, |
1101 | const struct nfs4_state_recovery_ops *ops) | |
1102 | { | |
1103 | /* Notify the server we're done reclaiming our state */ | |
1104 | if (ops->reclaim_complete) | |
1105 | (void)ops->reclaim_complete(clp); | |
1106 | } | |
1107 | ||
b79a4a1b TM |
1108 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) |
1109 | { | |
1110 | struct nfs4_state_owner *sp; | |
1111 | struct rb_node *pos; | |
1112 | struct nfs4_state *state; | |
1113 | ||
1114 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) | |
1115 | return; | |
1116 | ||
7cab89b2 RL |
1117 | nfs4_reclaim_complete(clp, |
1118 | nfs4_reboot_recovery_ops[clp->cl_minorversion]); | |
1119 | ||
b79a4a1b TM |
1120 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
1121 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
1122 | spin_lock(&sp->so_lock); | |
1123 | list_for_each_entry(state, &sp->so_states, open_states) { | |
1124 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags)) | |
1125 | continue; | |
1126 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1127 | } | |
1128 | spin_unlock(&sp->so_lock); | |
1129 | } | |
1130 | ||
1131 | nfs_delegation_reap_unclaimed(clp); | |
1132 | } | |
1133 | ||
1134 | static void nfs_delegation_clear_all(struct nfs_client *clp) | |
1135 | { | |
1136 | nfs_delegation_mark_reclaim(clp); | |
1137 | nfs_delegation_reap_unclaimed(clp); | |
1138 | } | |
1139 | ||
1140 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) | |
1141 | { | |
1142 | nfs_delegation_clear_all(clp); | |
1143 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); | |
1144 | } | |
1145 | ||
4f7cdf18 | 1146 | static int nfs4_recovery_handle_error(struct nfs_client *clp, int error) |
e598d843 TM |
1147 | { |
1148 | switch (error) { | |
1149 | case -NFS4ERR_CB_PATH_DOWN: | |
707fb4b3 | 1150 | nfs_handle_cb_pathdown(clp); |
4f7cdf18 | 1151 | return 0; |
c8b7ae3d TM |
1152 | case -NFS4ERR_NO_GRACE: |
1153 | nfs4_state_end_reclaim_reboot(clp); | |
1154 | return 0; | |
e598d843 TM |
1155 | case -NFS4ERR_STALE_CLIENTID: |
1156 | case -NFS4ERR_LEASE_MOVED: | |
1157 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
e345e88a | 1158 | nfs4_state_end_reclaim_reboot(clp); |
e598d843 TM |
1159 | nfs4_state_start_reclaim_reboot(clp); |
1160 | break; | |
1161 | case -NFS4ERR_EXPIRED: | |
1162 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1163 | nfs4_state_start_reclaim_nograce(clp); | |
8ba9bf8e | 1164 | break; |
c3fad1b1 AA |
1165 | case -NFS4ERR_BADSESSION: |
1166 | case -NFS4ERR_BADSLOT: | |
1167 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1168 | case -NFS4ERR_DEADSESSION: | |
1169 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1170 | case -NFS4ERR_SEQ_FALSE_RETRY: | |
1171 | case -NFS4ERR_SEQ_MISORDERED: | |
6df08189 | 1172 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
0b9e2d41 AA |
1173 | /* Zero session reset errors */ |
1174 | return 0; | |
e598d843 | 1175 | } |
4f7cdf18 | 1176 | return error; |
e598d843 TM |
1177 | } |
1178 | ||
02860014 | 1179 | static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 | 1180 | { |
9f958ab8 | 1181 | struct rb_node *pos; |
1da177e4 LT |
1182 | int status = 0; |
1183 | ||
7eff03ae TM |
1184 | restart: |
1185 | spin_lock(&clp->cl_lock); | |
02860014 TM |
1186 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
1187 | struct nfs4_state_owner *sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
7eff03ae TM |
1188 | if (!test_and_clear_bit(ops->owner_flag_bit, &sp->so_flags)) |
1189 | continue; | |
1190 | atomic_inc(&sp->so_count); | |
1191 | spin_unlock(&clp->cl_lock); | |
02860014 | 1192 | status = nfs4_reclaim_open_state(sp, ops); |
7eff03ae TM |
1193 | if (status < 0) { |
1194 | set_bit(ops->owner_flag_bit, &sp->so_flags); | |
1195 | nfs4_put_state_owner(sp); | |
4f7cdf18 | 1196 | return nfs4_recovery_handle_error(clp, status); |
7eff03ae TM |
1197 | } |
1198 | nfs4_put_state_owner(sp); | |
1199 | goto restart; | |
02860014 | 1200 | } |
7eff03ae | 1201 | spin_unlock(&clp->cl_lock); |
02860014 TM |
1202 | return status; |
1203 | } | |
1204 | ||
1205 | static int nfs4_check_lease(struct nfs_client *clp) | |
1206 | { | |
1207 | struct rpc_cred *cred; | |
8e69514f BH |
1208 | struct nfs4_state_maintenance_ops *ops = |
1209 | nfs4_state_renewal_ops[clp->cl_minorversion]; | |
02860014 | 1210 | int status = -NFS4ERR_EXPIRED; |
1da177e4 | 1211 | |
0f605b56 TM |
1212 | /* Is the client already known to have an expired lease? */ |
1213 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1214 | return 0; | |
a7b72103 AA |
1215 | spin_lock(&clp->cl_lock); |
1216 | cred = ops->get_state_renewal_cred_locked(clp); | |
1217 | spin_unlock(&clp->cl_lock); | |
0f605b56 TM |
1218 | if (cred == NULL) { |
1219 | cred = nfs4_get_setclientid_cred(clp); | |
1220 | if (cred == NULL) | |
1221 | goto out; | |
286d7d6a | 1222 | } |
8e69514f | 1223 | status = ops->renew_lease(clp, cred); |
0f605b56 TM |
1224 | put_rpccred(cred); |
1225 | out: | |
4f7cdf18 | 1226 | return nfs4_recovery_handle_error(clp, status); |
02860014 TM |
1227 | } |
1228 | ||
1229 | static int nfs4_reclaim_lease(struct nfs_client *clp) | |
1230 | { | |
1231 | struct rpc_cred *cred; | |
591d71cb AA |
1232 | struct nfs4_state_recovery_ops *ops = |
1233 | nfs4_reboot_recovery_ops[clp->cl_minorversion]; | |
02860014 TM |
1234 | int status = -ENOENT; |
1235 | ||
90a16617 | 1236 | cred = ops->get_clid_cred(clp); |
286d7d6a | 1237 | if (cred != NULL) { |
591d71cb | 1238 | status = ops->establish_clid(clp, cred); |
286d7d6a | 1239 | put_rpccred(cred); |
a2b2bb88 TM |
1240 | /* Handle case where the user hasn't set up machine creds */ |
1241 | if (status == -EACCES && cred == clp->cl_machine_cred) { | |
1242 | nfs4_clear_machine_cred(clp); | |
02860014 | 1243 | status = -EAGAIN; |
a2b2bb88 | 1244 | } |
c2e713dd BH |
1245 | if (status == -NFS4ERR_MINOR_VERS_MISMATCH) |
1246 | status = -EPROTONOSUPPORT; | |
286d7d6a | 1247 | } |
02860014 TM |
1248 | return status; |
1249 | } | |
1250 | ||
76db6d95 | 1251 | #ifdef CONFIG_NFS_V4_1 |
b9efa1b2 AA |
1252 | void nfs41_handle_recall_slot(struct nfs_client *clp) |
1253 | { | |
1254 | set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state); | |
1255 | nfs4_schedule_state_recovery(clp); | |
1256 | } | |
1257 | ||
0f79fd6f TM |
1258 | static void nfs4_reset_all_state(struct nfs_client *clp) |
1259 | { | |
1260 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
1261 | clp->cl_boot_time = CURRENT_TIME; | |
1262 | nfs4_state_start_reclaim_nograce(clp); | |
1263 | nfs4_schedule_state_recovery(clp); | |
1264 | } | |
1265 | } | |
1266 | ||
1267 | static void nfs41_handle_server_reboot(struct nfs_client *clp) | |
1268 | { | |
1269 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
1270 | nfs4_state_start_reclaim_reboot(clp); | |
1271 | nfs4_schedule_state_recovery(clp); | |
1272 | } | |
1273 | } | |
1274 | ||
1275 | static void nfs41_handle_state_revoked(struct nfs_client *clp) | |
1276 | { | |
1277 | /* Temporary */ | |
1278 | nfs4_reset_all_state(clp); | |
1279 | } | |
1280 | ||
1281 | static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp) | |
1282 | { | |
1283 | /* This will need to handle layouts too */ | |
1284 | nfs_expire_all_delegations(clp); | |
1285 | } | |
1286 | ||
1287 | static void nfs41_handle_cb_path_down(struct nfs_client *clp) | |
1288 | { | |
1289 | nfs_expire_all_delegations(clp); | |
1290 | if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0) | |
1291 | nfs4_schedule_state_recovery(clp); | |
1292 | } | |
1293 | ||
0629e370 AB |
1294 | void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags) |
1295 | { | |
1296 | if (!flags) | |
1297 | return; | |
0f79fd6f TM |
1298 | else if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) |
1299 | nfs41_handle_server_reboot(clp); | |
1300 | else if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED | | |
0629e370 AB |
1301 | SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED | |
1302 | SEQ4_STATUS_ADMIN_STATE_REVOKED | | |
0f79fd6f TM |
1303 | SEQ4_STATUS_LEASE_MOVED)) |
1304 | nfs41_handle_state_revoked(clp); | |
1305 | else if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED) | |
1306 | nfs41_handle_recallable_state_revoked(clp); | |
1307 | else if (flags & (SEQ4_STATUS_CB_PATH_DOWN | | |
0629e370 AB |
1308 | SEQ4_STATUS_BACKCHANNEL_FAULT | |
1309 | SEQ4_STATUS_CB_PATH_DOWN_SESSION)) | |
0f79fd6f | 1310 | nfs41_handle_cb_path_down(clp); |
0629e370 AB |
1311 | } |
1312 | ||
c3fad1b1 AA |
1313 | static int nfs4_reset_session(struct nfs_client *clp) |
1314 | { | |
1315 | int status; | |
1316 | ||
38045412 | 1317 | nfs4_begin_drain_session(clp); |
c3fad1b1 AA |
1318 | status = nfs4_proc_destroy_session(clp->cl_session); |
1319 | if (status && status != -NFS4ERR_BADSESSION && | |
1320 | status != -NFS4ERR_DEADSESSION) { | |
f455848a | 1321 | status = nfs4_recovery_handle_error(clp, status); |
c3fad1b1 AA |
1322 | goto out; |
1323 | } | |
1324 | ||
1325 | memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN); | |
f26468fb | 1326 | status = nfs4_proc_create_session(clp); |
41f54a55 | 1327 | if (status) { |
f455848a | 1328 | status = nfs4_recovery_handle_error(clp, status); |
41f54a55 AA |
1329 | goto out; |
1330 | } | |
1331 | /* create_session negotiated new slot table */ | |
1332 | clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state); | |
9dfdf404 | 1333 | |
41f54a55 AA |
1334 | /* Let the state manager reestablish state */ |
1335 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
5601a00d | 1336 | nfs41_setup_state_renewal(clp); |
41f54a55 | 1337 | out: |
c3fad1b1 AA |
1338 | return status; |
1339 | } | |
76db6d95 | 1340 | |
b9efa1b2 AA |
1341 | static int nfs4_recall_slot(struct nfs_client *clp) |
1342 | { | |
1343 | struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table; | |
1344 | struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs; | |
1345 | struct nfs4_slot *new, *old; | |
1346 | int i; | |
1347 | ||
1348 | nfs4_begin_drain_session(clp); | |
1349 | new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot), | |
1350 | GFP_KERNEL); | |
1351 | if (!new) | |
1352 | return -ENOMEM; | |
1353 | ||
1354 | spin_lock(&fc_tbl->slot_tbl_lock); | |
1355 | for (i = 0; i < fc_tbl->target_max_slots; i++) | |
1356 | new[i].seq_nr = fc_tbl->slots[i].seq_nr; | |
1357 | old = fc_tbl->slots; | |
1358 | fc_tbl->slots = new; | |
1359 | fc_tbl->max_slots = fc_tbl->target_max_slots; | |
1360 | fc_tbl->target_max_slots = 0; | |
1361 | fc_attrs->max_reqs = fc_tbl->max_slots; | |
1362 | spin_unlock(&fc_tbl->slot_tbl_lock); | |
1363 | ||
1364 | kfree(old); | |
1365 | nfs4_end_drain_session(clp); | |
1366 | return 0; | |
1367 | } | |
1368 | ||
76db6d95 | 1369 | #else /* CONFIG_NFS_V4_1 */ |
c3fad1b1 | 1370 | static int nfs4_reset_session(struct nfs_client *clp) { return 0; } |
5601a00d | 1371 | static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; } |
b9efa1b2 | 1372 | static int nfs4_recall_slot(struct nfs_client *clp) { return 0; } |
76db6d95 AA |
1373 | #endif /* CONFIG_NFS_V4_1 */ |
1374 | ||
78722e9c AA |
1375 | /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors |
1376 | * on EXCHANGE_ID for v4.1 | |
1377 | */ | |
1378 | static void nfs4_set_lease_expired(struct nfs_client *clp, int status) | |
1379 | { | |
1380 | if (nfs4_has_session(clp)) { | |
1381 | switch (status) { | |
1382 | case -NFS4ERR_DELAY: | |
1383 | case -NFS4ERR_CLID_INUSE: | |
1384 | case -EAGAIN: | |
2c643488 | 1385 | case -EKEYEXPIRED: |
78722e9c AA |
1386 | break; |
1387 | ||
1388 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery | |
1389 | * in nfs4_exchange_id */ | |
1390 | default: | |
1391 | return; | |
1392 | } | |
1393 | } | |
1394 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1395 | } | |
1396 | ||
e005e804 | 1397 | static void nfs4_state_manager(struct nfs_client *clp) |
02860014 | 1398 | { |
02860014 TM |
1399 | int status = 0; |
1400 | ||
02860014 | 1401 | /* Ensure exclusive access to NFSv4 state */ |
f3c76491 | 1402 | for(;;) { |
b79a4a1b TM |
1403 | if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
1404 | /* We're going to have to re-establish a clientid */ | |
1405 | status = nfs4_reclaim_lease(clp); | |
1406 | if (status) { | |
78722e9c | 1407 | nfs4_set_lease_expired(clp, status); |
b6d408ba TM |
1408 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, |
1409 | &clp->cl_state)) | |
b79a4a1b | 1410 | continue; |
76db6d95 AA |
1411 | if (clp->cl_cons_state == |
1412 | NFS_CS_SESSION_INITING) | |
1413 | nfs_mark_client_ready(clp, status); | |
b79a4a1b TM |
1414 | goto out_error; |
1415 | } | |
e598d843 | 1416 | clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); |
7cab89b2 | 1417 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
e598d843 TM |
1418 | } |
1419 | ||
1420 | if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { | |
1421 | status = nfs4_check_lease(clp); | |
b6d408ba | 1422 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
e598d843 | 1423 | continue; |
b6d408ba TM |
1424 | if (status < 0 && status != -NFS4ERR_CB_PATH_DOWN) |
1425 | goto out_error; | |
b79a4a1b | 1426 | } |
b6d408ba | 1427 | |
c3fad1b1 | 1428 | /* Initialize or reset the session */ |
6df08189 | 1429 | if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) |
7111dc73 | 1430 | && nfs4_has_session(clp)) { |
4d643d1d | 1431 | status = nfs4_reset_session(clp); |
b6d408ba TM |
1432 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
1433 | continue; | |
1434 | if (status < 0) | |
76db6d95 | 1435 | goto out_error; |
76db6d95 | 1436 | } |
b6d408ba | 1437 | |
b79a4a1b | 1438 | /* First recover reboot state... */ |
e345e88a | 1439 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { |
591d71cb AA |
1440 | status = nfs4_do_reclaim(clp, |
1441 | nfs4_reboot_recovery_ops[clp->cl_minorversion]); | |
b6d408ba | 1442 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 1443 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) |
c3fad1b1 | 1444 | continue; |
b79a4a1b | 1445 | nfs4_state_end_reclaim_reboot(clp); |
b6d408ba TM |
1446 | if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) |
1447 | continue; | |
1448 | if (status < 0) | |
1449 | goto out_error; | |
02860014 TM |
1450 | } |
1451 | ||
b79a4a1b TM |
1452 | /* Now recover expired state... */ |
1453 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { | |
591d71cb AA |
1454 | status = nfs4_do_reclaim(clp, |
1455 | nfs4_nograce_recovery_ops[clp->cl_minorversion]); | |
b6d408ba | 1456 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 1457 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) || |
b6d408ba TM |
1458 | test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
1459 | continue; | |
1460 | if (status < 0) | |
b79a4a1b | 1461 | goto out_error; |
1da177e4 | 1462 | } |
707fb4b3 | 1463 | |
5601a00d | 1464 | nfs4_end_drain_session(clp); |
707fb4b3 TM |
1465 | if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { |
1466 | nfs_client_return_marked_delegations(clp); | |
1467 | continue; | |
1468 | } | |
b9efa1b2 AA |
1469 | /* Recall session slots */ |
1470 | if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state) | |
1471 | && nfs4_has_session(clp)) { | |
1472 | status = nfs4_recall_slot(clp); | |
1473 | if (status < 0) | |
1474 | goto out_error; | |
1475 | continue; | |
1476 | } | |
1477 | ||
e005e804 TM |
1478 | |
1479 | nfs4_clear_state_manager_bit(clp); | |
f3c76491 TM |
1480 | /* Did we race with an attempt to give us more work? */ |
1481 | if (clp->cl_state == 0) | |
1482 | break; | |
1483 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) | |
1484 | break; | |
1da177e4 | 1485 | } |
e005e804 | 1486 | return; |
1da177e4 | 1487 | out_error: |
e005e804 | 1488 | printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s" |
5d8515ca | 1489 | " with error %d\n", clp->cl_hostname, -status); |
5601a00d | 1490 | nfs4_end_drain_session(clp); |
e005e804 TM |
1491 | nfs4_clear_state_manager_bit(clp); |
1492 | } | |
1493 | ||
1494 | static int nfs4_run_state_manager(void *ptr) | |
1495 | { | |
1496 | struct nfs_client *clp = ptr; | |
1497 | ||
1498 | allow_signal(SIGKILL); | |
1499 | nfs4_state_manager(clp); | |
1500 | nfs_put_client(clp); | |
1501 | module_put_and_exit(0); | |
1502 | return 0; | |
1da177e4 LT |
1503 | } |
1504 | ||
1505 | /* | |
1506 | * Local variables: | |
1507 | * c-basic-offset: 8 | |
1508 | * End: | |
1509 | */ |