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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 | ||
a7b72103 | 117 | struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp) |
286d7d6a TM |
118 | { |
119 | struct nfs4_state_owner *sp; | |
9f958ab8 | 120 | struct rb_node *pos; |
a2b2bb88 | 121 | struct rpc_cred *cred; |
286d7d6a | 122 | |
6dc9d57a TM |
123 | spin_lock(&clp->cl_lock); |
124 | cred = nfs4_get_machine_cred_locked(clp); | |
a2b2bb88 TM |
125 | if (cred != NULL) |
126 | goto out; | |
9f958ab8 TM |
127 | pos = rb_first(&clp->cl_state_owners); |
128 | if (pos != NULL) { | |
129 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
a2b2bb88 | 130 | cred = get_rpccred(sp->so_cred); |
286d7d6a | 131 | } |
a2b2bb88 | 132 | out: |
6dc9d57a | 133 | spin_unlock(&clp->cl_lock); |
a2b2bb88 | 134 | return cred; |
286d7d6a TM |
135 | } |
136 | ||
9f958ab8 TM |
137 | static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new, |
138 | __u64 minval, int maxbits) | |
139 | { | |
140 | struct rb_node **p, *parent; | |
141 | struct nfs_unique_id *pos; | |
142 | __u64 mask = ~0ULL; | |
143 | ||
144 | if (maxbits < 64) | |
145 | mask = (1ULL << maxbits) - 1ULL; | |
146 | ||
147 | /* Ensure distribution is more or less flat */ | |
148 | get_random_bytes(&new->id, sizeof(new->id)); | |
149 | new->id &= mask; | |
150 | if (new->id < minval) | |
151 | new->id += minval; | |
152 | retry: | |
153 | p = &root->rb_node; | |
154 | parent = NULL; | |
155 | ||
156 | while (*p != NULL) { | |
157 | parent = *p; | |
158 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); | |
159 | ||
160 | if (new->id < pos->id) | |
161 | p = &(*p)->rb_left; | |
162 | else if (new->id > pos->id) | |
163 | p = &(*p)->rb_right; | |
164 | else | |
165 | goto id_exists; | |
166 | } | |
167 | rb_link_node(&new->rb_node, parent, p); | |
168 | rb_insert_color(&new->rb_node, root); | |
169 | return; | |
170 | id_exists: | |
171 | for (;;) { | |
172 | new->id++; | |
173 | if (new->id < minval || (new->id & mask) != new->id) { | |
174 | new->id = minval; | |
175 | break; | |
176 | } | |
177 | parent = rb_next(parent); | |
178 | if (parent == NULL) | |
179 | break; | |
180 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); | |
181 | if (new->id < pos->id) | |
182 | break; | |
183 | } | |
184 | goto retry; | |
185 | } | |
186 | ||
187 | static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id) | |
188 | { | |
189 | rb_erase(&id->rb_node, root); | |
190 | } | |
191 | ||
1da177e4 | 192 | static struct nfs4_state_owner * |
6f2e64d3 | 193 | nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred) |
1da177e4 | 194 | { |
6f2e64d3 | 195 | struct nfs_client *clp = server->nfs_client; |
9f958ab8 TM |
196 | struct rb_node **p = &clp->cl_state_owners.rb_node, |
197 | *parent = NULL; | |
1da177e4 LT |
198 | struct nfs4_state_owner *sp, *res = NULL; |
199 | ||
9f958ab8 TM |
200 | while (*p != NULL) { |
201 | parent = *p; | |
202 | sp = rb_entry(parent, struct nfs4_state_owner, so_client_node); | |
203 | ||
6f2e64d3 TM |
204 | if (server < sp->so_server) { |
205 | p = &parent->rb_left; | |
206 | continue; | |
207 | } | |
208 | if (server > sp->so_server) { | |
209 | p = &parent->rb_right; | |
210 | continue; | |
211 | } | |
9f958ab8 TM |
212 | if (cred < sp->so_cred) |
213 | p = &parent->rb_left; | |
214 | else if (cred > sp->so_cred) | |
215 | p = &parent->rb_right; | |
216 | else { | |
217 | atomic_inc(&sp->so_count); | |
218 | res = sp; | |
219 | break; | |
220 | } | |
1da177e4 LT |
221 | } |
222 | return res; | |
223 | } | |
224 | ||
9f958ab8 TM |
225 | static struct nfs4_state_owner * |
226 | nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new) | |
227 | { | |
228 | struct rb_node **p = &clp->cl_state_owners.rb_node, | |
229 | *parent = NULL; | |
230 | struct nfs4_state_owner *sp; | |
231 | ||
232 | while (*p != NULL) { | |
233 | parent = *p; | |
234 | sp = rb_entry(parent, struct nfs4_state_owner, so_client_node); | |
235 | ||
6f2e64d3 TM |
236 | if (new->so_server < sp->so_server) { |
237 | p = &parent->rb_left; | |
238 | continue; | |
239 | } | |
240 | if (new->so_server > sp->so_server) { | |
241 | p = &parent->rb_right; | |
242 | continue; | |
243 | } | |
9f958ab8 TM |
244 | if (new->so_cred < sp->so_cred) |
245 | p = &parent->rb_left; | |
246 | else if (new->so_cred > sp->so_cred) | |
247 | p = &parent->rb_right; | |
248 | else { | |
249 | atomic_inc(&sp->so_count); | |
250 | return sp; | |
251 | } | |
252 | } | |
253 | nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64); | |
254 | rb_link_node(&new->so_client_node, parent, p); | |
255 | rb_insert_color(&new->so_client_node, &clp->cl_state_owners); | |
256 | return new; | |
257 | } | |
258 | ||
259 | static void | |
260 | nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp) | |
261 | { | |
262 | if (!RB_EMPTY_NODE(&sp->so_client_node)) | |
263 | rb_erase(&sp->so_client_node, &clp->cl_state_owners); | |
264 | nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id); | |
265 | } | |
266 | ||
1da177e4 LT |
267 | /* |
268 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to | |
269 | * create a new state_owner. | |
270 | * | |
271 | */ | |
272 | static struct nfs4_state_owner * | |
273 | nfs4_alloc_state_owner(void) | |
274 | { | |
275 | struct nfs4_state_owner *sp; | |
276 | ||
cee54fc9 | 277 | sp = kzalloc(sizeof(*sp),GFP_KERNEL); |
1da177e4 LT |
278 | if (!sp) |
279 | return NULL; | |
ec073428 | 280 | spin_lock_init(&sp->so_lock); |
1da177e4 LT |
281 | INIT_LIST_HEAD(&sp->so_states); |
282 | INIT_LIST_HEAD(&sp->so_delegations); | |
cee54fc9 TM |
283 | rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue"); |
284 | sp->so_seqid.sequence = &sp->so_sequence; | |
285 | spin_lock_init(&sp->so_sequence.lock); | |
286 | INIT_LIST_HEAD(&sp->so_sequence.list); | |
1da177e4 LT |
287 | atomic_set(&sp->so_count, 1); |
288 | return sp; | |
289 | } | |
290 | ||
1d2e88e7 | 291 | static void |
1da177e4 LT |
292 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) |
293 | { | |
9f958ab8 TM |
294 | if (!RB_EMPTY_NODE(&sp->so_client_node)) { |
295 | struct nfs_client *clp = sp->so_client; | |
296 | ||
297 | spin_lock(&clp->cl_lock); | |
298 | rb_erase(&sp->so_client_node, &clp->cl_state_owners); | |
299 | RB_CLEAR_NODE(&sp->so_client_node); | |
300 | spin_unlock(&clp->cl_lock); | |
301 | } | |
1da177e4 LT |
302 | } |
303 | ||
1da177e4 LT |
304 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred) |
305 | { | |
7539bbab | 306 | struct nfs_client *clp = server->nfs_client; |
1da177e4 LT |
307 | struct nfs4_state_owner *sp, *new; |
308 | ||
1da177e4 | 309 | spin_lock(&clp->cl_lock); |
6f2e64d3 | 310 | sp = nfs4_find_state_owner(server, cred); |
1da177e4 | 311 | spin_unlock(&clp->cl_lock); |
1da177e4 LT |
312 | if (sp != NULL) |
313 | return sp; | |
9f958ab8 TM |
314 | new = nfs4_alloc_state_owner(); |
315 | if (new == NULL) | |
316 | return NULL; | |
317 | new->so_client = clp; | |
6f2e64d3 | 318 | new->so_server = server; |
9f958ab8 TM |
319 | new->so_cred = cred; |
320 | spin_lock(&clp->cl_lock); | |
321 | sp = nfs4_insert_state_owner(clp, new); | |
322 | spin_unlock(&clp->cl_lock); | |
323 | if (sp == new) | |
324 | get_rpccred(cred); | |
f6a1cc89 TM |
325 | else { |
326 | rpc_destroy_wait_queue(&new->so_sequence.wait); | |
9f958ab8 | 327 | kfree(new); |
f6a1cc89 | 328 | } |
9f958ab8 | 329 | return sp; |
1da177e4 LT |
330 | } |
331 | ||
1da177e4 LT |
332 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) |
333 | { | |
adfa6f98 | 334 | struct nfs_client *clp = sp->so_client; |
1da177e4 LT |
335 | struct rpc_cred *cred = sp->so_cred; |
336 | ||
337 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
338 | return; | |
9f958ab8 | 339 | nfs4_remove_state_owner(clp, sp); |
1da177e4 | 340 | spin_unlock(&clp->cl_lock); |
f6a1cc89 | 341 | rpc_destroy_wait_queue(&sp->so_sequence.wait); |
1da177e4 LT |
342 | put_rpccred(cred); |
343 | kfree(sp); | |
344 | } | |
345 | ||
346 | static struct nfs4_state * | |
347 | nfs4_alloc_open_state(void) | |
348 | { | |
349 | struct nfs4_state *state; | |
350 | ||
e7616923 | 351 | state = kzalloc(sizeof(*state), GFP_KERNEL); |
1da177e4 LT |
352 | if (!state) |
353 | return NULL; | |
1da177e4 LT |
354 | atomic_set(&state->count, 1); |
355 | INIT_LIST_HEAD(&state->lock_states); | |
8d0a8a9d | 356 | spin_lock_init(&state->state_lock); |
8bda4e4c | 357 | seqlock_init(&state->seqlock); |
1da177e4 LT |
358 | return state; |
359 | } | |
360 | ||
4cecb76f | 361 | void |
dc0b027d | 362 | nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) |
4cecb76f | 363 | { |
dc0b027d | 364 | if (state->state == fmode) |
4cecb76f TM |
365 | return; |
366 | /* NB! List reordering - see the reclaim code for why. */ | |
dc0b027d TM |
367 | if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { |
368 | if (fmode & FMODE_WRITE) | |
4cecb76f TM |
369 | list_move(&state->open_states, &state->owner->so_states); |
370 | else | |
371 | list_move_tail(&state->open_states, &state->owner->so_states); | |
372 | } | |
dc0b027d | 373 | state->state = fmode; |
4cecb76f TM |
374 | } |
375 | ||
1da177e4 LT |
376 | static struct nfs4_state * |
377 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
378 | { | |
379 | struct nfs_inode *nfsi = NFS_I(inode); | |
380 | struct nfs4_state *state; | |
381 | ||
382 | list_for_each_entry(state, &nfsi->open_states, inode_states) { | |
1c816efa | 383 | if (state->owner != owner) |
1da177e4 | 384 | continue; |
1c816efa | 385 | if (atomic_inc_not_zero(&state->count)) |
1da177e4 | 386 | return state; |
1da177e4 LT |
387 | } |
388 | return NULL; | |
389 | } | |
390 | ||
1da177e4 LT |
391 | static void |
392 | nfs4_free_open_state(struct nfs4_state *state) | |
393 | { | |
394 | kfree(state); | |
395 | } | |
396 | ||
397 | struct nfs4_state * | |
398 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
399 | { | |
400 | struct nfs4_state *state, *new; | |
401 | struct nfs_inode *nfsi = NFS_I(inode); | |
402 | ||
403 | spin_lock(&inode->i_lock); | |
404 | state = __nfs4_find_state_byowner(inode, owner); | |
405 | spin_unlock(&inode->i_lock); | |
406 | if (state) | |
407 | goto out; | |
408 | new = nfs4_alloc_open_state(); | |
ec073428 | 409 | spin_lock(&owner->so_lock); |
1da177e4 LT |
410 | spin_lock(&inode->i_lock); |
411 | state = __nfs4_find_state_byowner(inode, owner); | |
412 | if (state == NULL && new != NULL) { | |
413 | state = new; | |
1da177e4 LT |
414 | state->owner = owner; |
415 | atomic_inc(&owner->so_count); | |
416 | list_add(&state->inode_states, &nfsi->open_states); | |
417 | state->inode = igrab(inode); | |
418 | spin_unlock(&inode->i_lock); | |
ec073428 TM |
419 | /* Note: The reclaim code dictates that we add stateless |
420 | * and read-only stateids to the end of the list */ | |
421 | list_add_tail(&state->open_states, &owner->so_states); | |
422 | spin_unlock(&owner->so_lock); | |
1da177e4 LT |
423 | } else { |
424 | spin_unlock(&inode->i_lock); | |
ec073428 | 425 | spin_unlock(&owner->so_lock); |
1da177e4 LT |
426 | if (new) |
427 | nfs4_free_open_state(new); | |
428 | } | |
429 | out: | |
430 | return state; | |
431 | } | |
432 | ||
1da177e4 LT |
433 | void nfs4_put_open_state(struct nfs4_state *state) |
434 | { | |
435 | struct inode *inode = state->inode; | |
436 | struct nfs4_state_owner *owner = state->owner; | |
437 | ||
ec073428 | 438 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
1da177e4 | 439 | return; |
ec073428 | 440 | spin_lock(&inode->i_lock); |
ba683031 | 441 | list_del(&state->inode_states); |
1da177e4 | 442 | list_del(&state->open_states); |
ec073428 TM |
443 | spin_unlock(&inode->i_lock); |
444 | spin_unlock(&owner->so_lock); | |
1da177e4 | 445 | iput(inode); |
1da177e4 LT |
446 | nfs4_free_open_state(state); |
447 | nfs4_put_state_owner(owner); | |
448 | } | |
449 | ||
450 | /* | |
83c9d41e | 451 | * Close the current file. |
1da177e4 | 452 | */ |
dc0b027d | 453 | static void __nfs4_close(struct path *path, struct nfs4_state *state, fmode_t fmode, int wait) |
1da177e4 | 454 | { |
1da177e4 | 455 | struct nfs4_state_owner *owner = state->owner; |
003707c7 | 456 | int call_close = 0; |
dc0b027d | 457 | fmode_t newstate; |
1da177e4 LT |
458 | |
459 | atomic_inc(&owner->so_count); | |
1da177e4 | 460 | /* Protect against nfs4_find_state() */ |
ec073428 | 461 | spin_lock(&owner->so_lock); |
dc0b027d | 462 | switch (fmode & (FMODE_READ | FMODE_WRITE)) { |
e7616923 TM |
463 | case FMODE_READ: |
464 | state->n_rdonly--; | |
465 | break; | |
466 | case FMODE_WRITE: | |
467 | state->n_wronly--; | |
468 | break; | |
469 | case FMODE_READ|FMODE_WRITE: | |
470 | state->n_rdwr--; | |
471 | } | |
003707c7 | 472 | newstate = FMODE_READ|FMODE_WRITE; |
e7616923 | 473 | if (state->n_rdwr == 0) { |
003707c7 | 474 | if (state->n_rdonly == 0) { |
e7616923 | 475 | newstate &= ~FMODE_READ; |
003707c7 TM |
476 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
477 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
478 | } | |
479 | if (state->n_wronly == 0) { | |
e7616923 | 480 | newstate &= ~FMODE_WRITE; |
003707c7 TM |
481 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
482 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
483 | } | |
484 | if (newstate == 0) | |
485 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
e7616923 | 486 | } |
003707c7 | 487 | nfs4_state_set_mode_locked(state, newstate); |
ec073428 | 488 | spin_unlock(&owner->so_lock); |
4cecb76f | 489 | |
003707c7 | 490 | if (!call_close) { |
b39e625b TM |
491 | nfs4_put_open_state(state); |
492 | nfs4_put_state_owner(owner); | |
493 | } else | |
a49c3c77 TM |
494 | nfs4_do_close(path, state, wait); |
495 | } | |
496 | ||
dc0b027d | 497 | void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 498 | { |
dc0b027d | 499 | __nfs4_close(path, state, fmode, 0); |
a49c3c77 TM |
500 | } |
501 | ||
dc0b027d | 502 | void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 503 | { |
dc0b027d | 504 | __nfs4_close(path, state, fmode, 1); |
1da177e4 LT |
505 | } |
506 | ||
507 | /* | |
508 | * Search the state->lock_states for an existing lock_owner | |
509 | * that is compatible with current->files | |
510 | */ | |
511 | static struct nfs4_lock_state * | |
512 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) | |
513 | { | |
514 | struct nfs4_lock_state *pos; | |
515 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
516 | if (pos->ls_owner != fl_owner) | |
517 | continue; | |
518 | atomic_inc(&pos->ls_count); | |
519 | return pos; | |
520 | } | |
521 | return NULL; | |
522 | } | |
523 | ||
1da177e4 LT |
524 | /* |
525 | * Return a compatible lock_state. If no initialized lock_state structure | |
526 | * exists, return an uninitialized one. | |
527 | * | |
1da177e4 LT |
528 | */ |
529 | static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) | |
530 | { | |
531 | struct nfs4_lock_state *lsp; | |
adfa6f98 | 532 | struct nfs_client *clp = state->owner->so_client; |
1da177e4 | 533 | |
cee54fc9 | 534 | lsp = kzalloc(sizeof(*lsp), GFP_KERNEL); |
1da177e4 LT |
535 | if (lsp == NULL) |
536 | return NULL; | |
d0dc3701 TM |
537 | rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue"); |
538 | spin_lock_init(&lsp->ls_sequence.lock); | |
539 | INIT_LIST_HEAD(&lsp->ls_sequence.list); | |
540 | lsp->ls_seqid.sequence = &lsp->ls_sequence; | |
1da177e4 LT |
541 | atomic_set(&lsp->ls_count, 1); |
542 | lsp->ls_owner = fl_owner; | |
1da177e4 | 543 | spin_lock(&clp->cl_lock); |
9f958ab8 | 544 | nfs_alloc_unique_id(&clp->cl_lockowner_id, &lsp->ls_id, 1, 64); |
1da177e4 | 545 | spin_unlock(&clp->cl_lock); |
8d0a8a9d | 546 | INIT_LIST_HEAD(&lsp->ls_locks); |
1da177e4 LT |
547 | return lsp; |
548 | } | |
549 | ||
9f958ab8 TM |
550 | static void nfs4_free_lock_state(struct nfs4_lock_state *lsp) |
551 | { | |
552 | struct nfs_client *clp = lsp->ls_state->owner->so_client; | |
553 | ||
554 | spin_lock(&clp->cl_lock); | |
555 | nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id); | |
556 | spin_unlock(&clp->cl_lock); | |
f6a1cc89 | 557 | rpc_destroy_wait_queue(&lsp->ls_sequence.wait); |
9f958ab8 TM |
558 | kfree(lsp); |
559 | } | |
560 | ||
1da177e4 LT |
561 | /* |
562 | * Return a compatible lock_state. If no initialized lock_state structure | |
563 | * exists, return an uninitialized one. | |
564 | * | |
1da177e4 | 565 | */ |
8d0a8a9d | 566 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner) |
1da177e4 | 567 | { |
8d0a8a9d | 568 | struct nfs4_lock_state *lsp, *new = NULL; |
1da177e4 | 569 | |
8d0a8a9d TM |
570 | for(;;) { |
571 | spin_lock(&state->state_lock); | |
572 | lsp = __nfs4_find_lock_state(state, owner); | |
573 | if (lsp != NULL) | |
574 | break; | |
575 | if (new != NULL) { | |
576 | new->ls_state = state; | |
577 | list_add(&new->ls_locks, &state->lock_states); | |
578 | set_bit(LK_STATE_IN_USE, &state->flags); | |
579 | lsp = new; | |
580 | new = NULL; | |
581 | break; | |
582 | } | |
583 | spin_unlock(&state->state_lock); | |
584 | new = nfs4_alloc_lock_state(state, owner); | |
585 | if (new == NULL) | |
586 | return NULL; | |
587 | } | |
588 | spin_unlock(&state->state_lock); | |
9f958ab8 TM |
589 | if (new != NULL) |
590 | nfs4_free_lock_state(new); | |
1da177e4 LT |
591 | return lsp; |
592 | } | |
593 | ||
594 | /* | |
8d0a8a9d TM |
595 | * Release reference to lock_state, and free it if we see that |
596 | * it is no longer in use | |
1da177e4 | 597 | */ |
faf5f49c | 598 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
1da177e4 | 599 | { |
8d0a8a9d | 600 | struct nfs4_state *state; |
1da177e4 | 601 | |
8d0a8a9d TM |
602 | if (lsp == NULL) |
603 | return; | |
604 | state = lsp->ls_state; | |
605 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) | |
606 | return; | |
607 | list_del(&lsp->ls_locks); | |
608 | if (list_empty(&state->lock_states)) | |
609 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
610 | spin_unlock(&state->state_lock); | |
9f958ab8 | 611 | nfs4_free_lock_state(lsp); |
1da177e4 LT |
612 | } |
613 | ||
8d0a8a9d | 614 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
1da177e4 | 615 | { |
8d0a8a9d | 616 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
1da177e4 | 617 | |
8d0a8a9d TM |
618 | dst->fl_u.nfs4_fl.owner = lsp; |
619 | atomic_inc(&lsp->ls_count); | |
620 | } | |
1da177e4 | 621 | |
8d0a8a9d | 622 | static void nfs4_fl_release_lock(struct file_lock *fl) |
1da177e4 | 623 | { |
8d0a8a9d | 624 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
1da177e4 LT |
625 | } |
626 | ||
8d0a8a9d TM |
627 | static struct file_lock_operations nfs4_fl_lock_ops = { |
628 | .fl_copy_lock = nfs4_fl_copy_lock, | |
629 | .fl_release_private = nfs4_fl_release_lock, | |
630 | }; | |
631 | ||
632 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
1da177e4 | 633 | { |
8d0a8a9d TM |
634 | struct nfs4_lock_state *lsp; |
635 | ||
636 | if (fl->fl_ops != NULL) | |
637 | return 0; | |
638 | lsp = nfs4_get_lock_state(state, fl->fl_owner); | |
639 | if (lsp == NULL) | |
640 | return -ENOMEM; | |
641 | fl->fl_u.nfs4_fl.owner = lsp; | |
642 | fl->fl_ops = &nfs4_fl_lock_ops; | |
643 | return 0; | |
1da177e4 LT |
644 | } |
645 | ||
8d0a8a9d TM |
646 | /* |
647 | * Byte-range lock aware utility to initialize the stateid of read/write | |
648 | * requests. | |
1da177e4 | 649 | */ |
8d0a8a9d | 650 | void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner) |
1da177e4 | 651 | { |
8d0a8a9d | 652 | struct nfs4_lock_state *lsp; |
8bda4e4c | 653 | int seq; |
1da177e4 | 654 | |
8bda4e4c TM |
655 | do { |
656 | seq = read_seqbegin(&state->seqlock); | |
657 | memcpy(dst, &state->stateid, sizeof(*dst)); | |
658 | } while (read_seqretry(&state->seqlock, seq)); | |
8d0a8a9d TM |
659 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
660 | return; | |
1da177e4 | 661 | |
8d0a8a9d TM |
662 | spin_lock(&state->state_lock); |
663 | lsp = __nfs4_find_lock_state(state, fl_owner); | |
664 | if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) | |
665 | memcpy(dst, &lsp->ls_stateid, sizeof(*dst)); | |
666 | spin_unlock(&state->state_lock); | |
1da177e4 LT |
667 | nfs4_put_lock_state(lsp); |
668 | } | |
669 | ||
cee54fc9 TM |
670 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter) |
671 | { | |
cee54fc9 TM |
672 | struct nfs_seqid *new; |
673 | ||
674 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
675 | if (new != NULL) { | |
676 | new->sequence = counter; | |
2f74c0a0 | 677 | INIT_LIST_HEAD(&new->list); |
cee54fc9 TM |
678 | } |
679 | return new; | |
680 | } | |
681 | ||
682 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
1da177e4 | 683 | { |
2f74c0a0 TM |
684 | if (!list_empty(&seqid->list)) { |
685 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
cee54fc9 | 686 | |
2f74c0a0 TM |
687 | spin_lock(&sequence->lock); |
688 | list_del(&seqid->list); | |
689 | spin_unlock(&sequence->lock); | |
690 | rpc_wake_up(&sequence->wait); | |
691 | } | |
cee54fc9 | 692 | kfree(seqid); |
1da177e4 LT |
693 | } |
694 | ||
695 | /* | |
cee54fc9 TM |
696 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
697 | * failed with a seqid incrementing error - | |
698 | * see comments nfs_fs.h:seqid_mutating_error() | |
699 | */ | |
88d90939 | 700 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
cee54fc9 | 701 | { |
2f74c0a0 | 702 | BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid); |
cee54fc9 TM |
703 | switch (status) { |
704 | case 0: | |
705 | break; | |
706 | case -NFS4ERR_BAD_SEQID: | |
6f43ddcc TM |
707 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
708 | return; | |
709 | printk(KERN_WARNING "NFS: v4 server returned a bad" | |
497799e7 DM |
710 | " sequence-id error on an" |
711 | " unconfirmed sequence %p!\n", | |
6f43ddcc | 712 | seqid->sequence); |
cee54fc9 TM |
713 | case -NFS4ERR_STALE_CLIENTID: |
714 | case -NFS4ERR_STALE_STATEID: | |
715 | case -NFS4ERR_BAD_STATEID: | |
716 | case -NFS4ERR_BADXDR: | |
717 | case -NFS4ERR_RESOURCE: | |
718 | case -NFS4ERR_NOFILEHANDLE: | |
719 | /* Non-seqid mutating errors */ | |
720 | return; | |
721 | }; | |
722 | /* | |
723 | * Note: no locking needed as we are guaranteed to be first | |
724 | * on the sequence list | |
725 | */ | |
726 | seqid->sequence->counter++; | |
727 | } | |
728 | ||
729 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
730 | { | |
731 | if (status == -NFS4ERR_BAD_SEQID) { | |
732 | struct nfs4_state_owner *sp = container_of(seqid->sequence, | |
733 | struct nfs4_state_owner, so_seqid); | |
1da177e4 | 734 | nfs4_drop_state_owner(sp); |
cee54fc9 | 735 | } |
88d90939 | 736 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
737 | } |
738 | ||
739 | /* | |
cee54fc9 TM |
740 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
741 | * failed with a seqid incrementing error - | |
742 | * see comments nfs_fs.h:seqid_mutating_error() | |
743 | */ | |
744 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
745 | { | |
88d90939 | 746 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
747 | } |
748 | ||
749 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
750 | { | |
751 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
752 | int status = 0; | |
753 | ||
754 | spin_lock(&sequence->lock); | |
2f74c0a0 TM |
755 | if (list_empty(&seqid->list)) |
756 | list_add_tail(&seqid->list, &sequence->list); | |
757 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) | |
758 | goto unlock; | |
5d00837b | 759 | rpc_sleep_on(&sequence->wait, task, NULL); |
2f74c0a0 TM |
760 | status = -EAGAIN; |
761 | unlock: | |
cee54fc9 TM |
762 | spin_unlock(&sequence->lock); |
763 | return status; | |
1da177e4 LT |
764 | } |
765 | ||
e005e804 | 766 | static int nfs4_run_state_manager(void *); |
1da177e4 | 767 | |
e005e804 | 768 | static void nfs4_clear_state_manager_bit(struct nfs_client *clp) |
433fbe4c TM |
769 | { |
770 | smp_mb__before_clear_bit(); | |
e005e804 | 771 | clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); |
433fbe4c | 772 | smp_mb__after_clear_bit(); |
e005e804 | 773 | wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); |
433fbe4c TM |
774 | rpc_wake_up(&clp->cl_rpcwaitq); |
775 | } | |
776 | ||
1da177e4 | 777 | /* |
e005e804 | 778 | * Schedule the nfs_client asynchronous state management routine |
1da177e4 | 779 | */ |
b0d3ded1 | 780 | void nfs4_schedule_state_manager(struct nfs_client *clp) |
1da177e4 | 781 | { |
5043e900 | 782 | struct task_struct *task; |
1da177e4 | 783 | |
e005e804 TM |
784 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
785 | return; | |
5043e900 TM |
786 | __module_get(THIS_MODULE); |
787 | atomic_inc(&clp->cl_count); | |
e005e804 | 788 | task = kthread_run(nfs4_run_state_manager, clp, "%s-manager", |
5d8515ca CL |
789 | rpc_peeraddr2str(clp->cl_rpcclient, |
790 | RPC_DISPLAY_ADDR)); | |
5043e900 TM |
791 | if (!IS_ERR(task)) |
792 | return; | |
e005e804 | 793 | nfs4_clear_state_manager_bit(clp); |
24c8dbbb | 794 | nfs_put_client(clp); |
5043e900 | 795 | module_put(THIS_MODULE); |
1da177e4 LT |
796 | } |
797 | ||
798 | /* | |
799 | * Schedule a state recovery attempt | |
800 | */ | |
adfa6f98 | 801 | void nfs4_schedule_state_recovery(struct nfs_client *clp) |
1da177e4 LT |
802 | { |
803 | if (!clp) | |
804 | return; | |
e598d843 TM |
805 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
806 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
e005e804 | 807 | nfs4_schedule_state_manager(clp); |
1da177e4 LT |
808 | } |
809 | ||
b79a4a1b TM |
810 | static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
811 | { | |
812 | ||
813 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
814 | /* Don't recover state that expired before the reboot */ | |
815 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { | |
816 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
817 | return 0; | |
818 | } | |
7eff03ae | 819 | set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); |
b79a4a1b TM |
820 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
821 | return 1; | |
822 | } | |
823 | ||
9e33bed5 | 824 | int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
825 | { |
826 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); | |
827 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
7eff03ae | 828 | set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); |
b79a4a1b TM |
829 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
830 | return 1; | |
831 | } | |
832 | ||
02860014 | 833 | static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
834 | { |
835 | struct inode *inode = state->inode; | |
19e03c57 | 836 | struct nfs_inode *nfsi = NFS_I(inode); |
1da177e4 LT |
837 | struct file_lock *fl; |
838 | int status = 0; | |
839 | ||
19e03c57 | 840 | down_write(&nfsi->rwsem); |
90dc7d27 | 841 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
43b2a33a | 842 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
1da177e4 | 843 | continue; |
cd3758e3 | 844 | if (nfs_file_open_context(fl->fl_file)->state != state) |
1da177e4 LT |
845 | continue; |
846 | status = ops->recover_lock(state, fl); | |
847 | if (status >= 0) | |
848 | continue; | |
849 | switch (status) { | |
850 | default: | |
851 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
3110ff80 | 852 | __func__, status); |
1da177e4 LT |
853 | case -NFS4ERR_EXPIRED: |
854 | case -NFS4ERR_NO_GRACE: | |
855 | case -NFS4ERR_RECLAIM_BAD: | |
856 | case -NFS4ERR_RECLAIM_CONFLICT: | |
43b2a33a | 857 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
1da177e4 LT |
858 | break; |
859 | case -NFS4ERR_STALE_CLIENTID: | |
860 | goto out_err; | |
861 | } | |
862 | } | |
19e03c57 | 863 | up_write(&nfsi->rwsem); |
1da177e4 LT |
864 | return 0; |
865 | out_err: | |
19e03c57 | 866 | up_write(&nfsi->rwsem); |
1da177e4 LT |
867 | return status; |
868 | } | |
869 | ||
02860014 | 870 | static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
871 | { |
872 | struct nfs4_state *state; | |
873 | struct nfs4_lock_state *lock; | |
874 | int status = 0; | |
875 | ||
876 | /* Note: we rely on the sp->so_states list being ordered | |
877 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
878 | * states first. | |
879 | * This is needed to ensure that the server won't give us any | |
880 | * read delegations that we have to return if, say, we are | |
881 | * recovering after a network partition or a reboot from a | |
882 | * server that doesn't support a grace period. | |
883 | */ | |
fe1d8195 TM |
884 | restart: |
885 | spin_lock(&sp->so_lock); | |
1da177e4 | 886 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
887 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) |
888 | continue; | |
1da177e4 LT |
889 | if (state->state == 0) |
890 | continue; | |
fe1d8195 TM |
891 | atomic_inc(&state->count); |
892 | spin_unlock(&sp->so_lock); | |
1da177e4 | 893 | status = ops->recover_open(sp, state); |
1da177e4 | 894 | if (status >= 0) { |
02860014 TM |
895 | status = nfs4_reclaim_locks(state, ops); |
896 | if (status >= 0) { | |
897 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
898 | if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) | |
899 | printk("%s: Lock reclaim failed!\n", | |
3110ff80 | 900 | __func__); |
02860014 | 901 | } |
fe1d8195 TM |
902 | nfs4_put_open_state(state); |
903 | goto restart; | |
1da177e4 | 904 | } |
1da177e4 LT |
905 | } |
906 | switch (status) { | |
907 | default: | |
908 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
3110ff80 | 909 | __func__, status); |
1da177e4 | 910 | case -ENOENT: |
b79a4a1b | 911 | case -ESTALE: |
1da177e4 LT |
912 | /* |
913 | * Open state on this file cannot be recovered | |
914 | * All we can do is revert to using the zero stateid. | |
915 | */ | |
916 | memset(state->stateid.data, 0, | |
917 | sizeof(state->stateid.data)); | |
918 | /* Mark the file as being 'closed' */ | |
919 | state->state = 0; | |
920 | break; | |
b79a4a1b TM |
921 | case -NFS4ERR_RECLAIM_BAD: |
922 | case -NFS4ERR_RECLAIM_CONFLICT: | |
923 | nfs4_state_mark_reclaim_nograce(sp->so_client, state); | |
924 | break; | |
1da177e4 LT |
925 | case -NFS4ERR_EXPIRED: |
926 | case -NFS4ERR_NO_GRACE: | |
b79a4a1b | 927 | nfs4_state_mark_reclaim_nograce(sp->so_client, state); |
1da177e4 LT |
928 | case -NFS4ERR_STALE_CLIENTID: |
929 | goto out_err; | |
930 | } | |
fe1d8195 TM |
931 | nfs4_put_open_state(state); |
932 | goto restart; | |
1da177e4 | 933 | } |
fe1d8195 | 934 | spin_unlock(&sp->so_lock); |
1da177e4 LT |
935 | return 0; |
936 | out_err: | |
fe1d8195 | 937 | nfs4_put_open_state(state); |
1da177e4 LT |
938 | return status; |
939 | } | |
940 | ||
b79a4a1b TM |
941 | static void nfs4_clear_open_state(struct nfs4_state *state) |
942 | { | |
943 | struct nfs4_lock_state *lock; | |
944 | ||
945 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
946 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); | |
947 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); | |
948 | clear_bit(NFS_O_RDWR_STATE, &state->flags); | |
949 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
b79a4a1b TM |
950 | lock->ls_seqid.flags = 0; |
951 | lock->ls_flags &= ~NFS_LOCK_INITIALIZED; | |
952 | } | |
953 | } | |
954 | ||
955 | static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
cee54fc9 TM |
956 | { |
957 | struct nfs4_state_owner *sp; | |
9f958ab8 | 958 | struct rb_node *pos; |
cee54fc9 | 959 | struct nfs4_state *state; |
cee54fc9 TM |
960 | |
961 | /* Reset all sequence ids to zero */ | |
9f958ab8 TM |
962 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
963 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
cee54fc9 | 964 | sp->so_seqid.flags = 0; |
ec073428 | 965 | spin_lock(&sp->so_lock); |
cee54fc9 | 966 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
967 | if (mark_reclaim(clp, state)) |
968 | nfs4_clear_open_state(state); | |
cee54fc9 | 969 | } |
ec073428 | 970 | spin_unlock(&sp->so_lock); |
cee54fc9 TM |
971 | } |
972 | } | |
973 | ||
b79a4a1b TM |
974 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
975 | { | |
976 | /* Mark all delegations for reclaim */ | |
977 | nfs_delegation_mark_reclaim(clp); | |
978 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); | |
979 | } | |
980 | ||
981 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) | |
982 | { | |
983 | struct nfs4_state_owner *sp; | |
984 | struct rb_node *pos; | |
985 | struct nfs4_state *state; | |
986 | ||
987 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) | |
988 | return; | |
989 | ||
990 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { | |
991 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
992 | spin_lock(&sp->so_lock); | |
993 | list_for_each_entry(state, &sp->so_states, open_states) { | |
994 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags)) | |
995 | continue; | |
996 | nfs4_state_mark_reclaim_nograce(clp, state); | |
997 | } | |
998 | spin_unlock(&sp->so_lock); | |
999 | } | |
1000 | ||
1001 | nfs_delegation_reap_unclaimed(clp); | |
1002 | } | |
1003 | ||
1004 | static void nfs_delegation_clear_all(struct nfs_client *clp) | |
1005 | { | |
1006 | nfs_delegation_mark_reclaim(clp); | |
1007 | nfs_delegation_reap_unclaimed(clp); | |
1008 | } | |
1009 | ||
1010 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) | |
1011 | { | |
1012 | nfs_delegation_clear_all(clp); | |
1013 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); | |
1014 | } | |
1015 | ||
1016 | static void nfs4_state_end_reclaim_nograce(struct nfs_client *clp) | |
1017 | { | |
1018 | clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); | |
1019 | } | |
1020 | ||
e598d843 TM |
1021 | static void nfs4_recovery_handle_error(struct nfs_client *clp, int error) |
1022 | { | |
1023 | switch (error) { | |
1024 | case -NFS4ERR_CB_PATH_DOWN: | |
707fb4b3 | 1025 | nfs_handle_cb_pathdown(clp); |
e598d843 TM |
1026 | break; |
1027 | case -NFS4ERR_STALE_CLIENTID: | |
1028 | case -NFS4ERR_LEASE_MOVED: | |
1029 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1030 | nfs4_state_start_reclaim_reboot(clp); | |
1031 | break; | |
1032 | case -NFS4ERR_EXPIRED: | |
1033 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1034 | nfs4_state_start_reclaim_nograce(clp); | |
c3fad1b1 AA |
1035 | case -NFS4ERR_BADSESSION: |
1036 | case -NFS4ERR_BADSLOT: | |
1037 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1038 | case -NFS4ERR_DEADSESSION: | |
1039 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1040 | case -NFS4ERR_SEQ_FALSE_RETRY: | |
1041 | case -NFS4ERR_SEQ_MISORDERED: | |
1042 | set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state); | |
e598d843 TM |
1043 | } |
1044 | } | |
1045 | ||
02860014 | 1046 | static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 | 1047 | { |
9f958ab8 | 1048 | struct rb_node *pos; |
1da177e4 LT |
1049 | int status = 0; |
1050 | ||
7eff03ae TM |
1051 | restart: |
1052 | spin_lock(&clp->cl_lock); | |
02860014 TM |
1053 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
1054 | struct nfs4_state_owner *sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
7eff03ae TM |
1055 | if (!test_and_clear_bit(ops->owner_flag_bit, &sp->so_flags)) |
1056 | continue; | |
1057 | atomic_inc(&sp->so_count); | |
1058 | spin_unlock(&clp->cl_lock); | |
02860014 | 1059 | status = nfs4_reclaim_open_state(sp, ops); |
7eff03ae TM |
1060 | if (status < 0) { |
1061 | set_bit(ops->owner_flag_bit, &sp->so_flags); | |
1062 | nfs4_put_state_owner(sp); | |
1063 | nfs4_recovery_handle_error(clp, status); | |
1064 | return status; | |
1065 | } | |
1066 | nfs4_put_state_owner(sp); | |
1067 | goto restart; | |
02860014 | 1068 | } |
7eff03ae | 1069 | spin_unlock(&clp->cl_lock); |
02860014 TM |
1070 | return status; |
1071 | } | |
1072 | ||
1073 | static int nfs4_check_lease(struct nfs_client *clp) | |
1074 | { | |
1075 | struct rpc_cred *cred; | |
8e69514f BH |
1076 | struct nfs4_state_maintenance_ops *ops = |
1077 | nfs4_state_renewal_ops[clp->cl_minorversion]; | |
02860014 | 1078 | int status = -NFS4ERR_EXPIRED; |
1da177e4 | 1079 | |
0f605b56 TM |
1080 | /* Is the client already known to have an expired lease? */ |
1081 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1082 | return 0; | |
a7b72103 AA |
1083 | spin_lock(&clp->cl_lock); |
1084 | cred = ops->get_state_renewal_cred_locked(clp); | |
1085 | spin_unlock(&clp->cl_lock); | |
0f605b56 TM |
1086 | if (cred == NULL) { |
1087 | cred = nfs4_get_setclientid_cred(clp); | |
1088 | if (cred == NULL) | |
1089 | goto out; | |
286d7d6a | 1090 | } |
8e69514f | 1091 | status = ops->renew_lease(clp, cred); |
0f605b56 TM |
1092 | put_rpccred(cred); |
1093 | out: | |
1094 | nfs4_recovery_handle_error(clp, status); | |
02860014 TM |
1095 | return status; |
1096 | } | |
1097 | ||
1098 | static int nfs4_reclaim_lease(struct nfs_client *clp) | |
1099 | { | |
1100 | struct rpc_cred *cred; | |
591d71cb AA |
1101 | struct nfs4_state_recovery_ops *ops = |
1102 | nfs4_reboot_recovery_ops[clp->cl_minorversion]; | |
02860014 TM |
1103 | int status = -ENOENT; |
1104 | ||
90a16617 | 1105 | cred = ops->get_clid_cred(clp); |
286d7d6a | 1106 | if (cred != NULL) { |
591d71cb | 1107 | status = ops->establish_clid(clp, cred); |
286d7d6a | 1108 | put_rpccred(cred); |
a2b2bb88 TM |
1109 | /* Handle case where the user hasn't set up machine creds */ |
1110 | if (status == -EACCES && cred == clp->cl_machine_cred) { | |
1111 | nfs4_clear_machine_cred(clp); | |
02860014 | 1112 | status = -EAGAIN; |
a2b2bb88 | 1113 | } |
c2e713dd BH |
1114 | if (status == -NFS4ERR_MINOR_VERS_MISMATCH) |
1115 | status = -EPROTONOSUPPORT; | |
286d7d6a | 1116 | } |
02860014 TM |
1117 | return status; |
1118 | } | |
1119 | ||
76db6d95 | 1120 | #ifdef CONFIG_NFS_V4_1 |
c3fad1b1 AA |
1121 | static void nfs4_session_recovery_handle_error(struct nfs_client *clp, int err) |
1122 | { | |
1123 | switch (err) { | |
1124 | case -NFS4ERR_STALE_CLIENTID: | |
1125 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1126 | set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state); | |
1127 | } | |
1128 | } | |
1129 | ||
1130 | static int nfs4_reset_session(struct nfs_client *clp) | |
1131 | { | |
1132 | int status; | |
1133 | ||
1134 | status = nfs4_proc_destroy_session(clp->cl_session); | |
1135 | if (status && status != -NFS4ERR_BADSESSION && | |
1136 | status != -NFS4ERR_DEADSESSION) { | |
1137 | nfs4_session_recovery_handle_error(clp, status); | |
1138 | goto out; | |
1139 | } | |
1140 | ||
1141 | memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN); | |
1142 | status = nfs4_proc_create_session(clp, 1); | |
1143 | if (status) | |
1144 | nfs4_session_recovery_handle_error(clp, status); | |
1145 | /* fall through*/ | |
1146 | out: | |
1147 | /* Wake up the next rpc task even on error */ | |
1148 | rpc_wake_up_next(&clp->cl_session->fc_slot_table.slot_tbl_waitq); | |
1149 | return status; | |
1150 | } | |
76db6d95 AA |
1151 | |
1152 | static int nfs4_initialize_session(struct nfs_client *clp) | |
1153 | { | |
1154 | int status; | |
1155 | ||
1156 | status = nfs4_proc_create_session(clp, 0); | |
1157 | if (!status) { | |
1158 | nfs_mark_client_ready(clp, NFS_CS_READY); | |
1159 | } else if (status == -NFS4ERR_STALE_CLIENTID) { | |
1160 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1161 | set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state); | |
1162 | } else { | |
1163 | nfs_mark_client_ready(clp, status); | |
1164 | } | |
1165 | return status; | |
1166 | } | |
1167 | #else /* CONFIG_NFS_V4_1 */ | |
c3fad1b1 | 1168 | static int nfs4_reset_session(struct nfs_client *clp) { return 0; } |
76db6d95 AA |
1169 | static int nfs4_initialize_session(struct nfs_client *clp) { return 0; } |
1170 | #endif /* CONFIG_NFS_V4_1 */ | |
1171 | ||
e005e804 | 1172 | static void nfs4_state_manager(struct nfs_client *clp) |
02860014 | 1173 | { |
02860014 TM |
1174 | int status = 0; |
1175 | ||
02860014 | 1176 | /* Ensure exclusive access to NFSv4 state */ |
f3c76491 | 1177 | for(;;) { |
b79a4a1b TM |
1178 | if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
1179 | /* We're going to have to re-establish a clientid */ | |
1180 | status = nfs4_reclaim_lease(clp); | |
1181 | if (status) { | |
1182 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1183 | if (status == -EAGAIN) | |
1184 | continue; | |
76db6d95 AA |
1185 | if (clp->cl_cons_state == |
1186 | NFS_CS_SESSION_INITING) | |
1187 | nfs_mark_client_ready(clp, status); | |
b79a4a1b TM |
1188 | goto out_error; |
1189 | } | |
e598d843 TM |
1190 | clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); |
1191 | } | |
1192 | ||
1193 | if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { | |
1194 | status = nfs4_check_lease(clp); | |
1195 | if (status != 0) | |
1196 | continue; | |
b79a4a1b | 1197 | } |
c3fad1b1 | 1198 | /* Initialize or reset the session */ |
76db6d95 AA |
1199 | if (nfs4_has_session(clp) && |
1200 | test_and_clear_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) { | |
c3fad1b1 AA |
1201 | if (clp->cl_cons_state == NFS_CS_SESSION_INITING) |
1202 | status = nfs4_initialize_session(clp); | |
1203 | else | |
1204 | status = nfs4_reset_session(clp); | |
76db6d95 AA |
1205 | if (status) { |
1206 | if (status == -NFS4ERR_STALE_CLIENTID) | |
1207 | continue; | |
1208 | goto out_error; | |
1209 | } | |
1210 | } | |
b79a4a1b TM |
1211 | /* First recover reboot state... */ |
1212 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { | |
591d71cb AA |
1213 | status = nfs4_do_reclaim(clp, |
1214 | nfs4_reboot_recovery_ops[clp->cl_minorversion]); | |
e598d843 | 1215 | if (status == -NFS4ERR_STALE_CLIENTID) |
02860014 | 1216 | continue; |
c3fad1b1 AA |
1217 | if (test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) |
1218 | continue; | |
b79a4a1b TM |
1219 | nfs4_state_end_reclaim_reboot(clp); |
1220 | continue; | |
02860014 TM |
1221 | } |
1222 | ||
b79a4a1b TM |
1223 | /* Now recover expired state... */ |
1224 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { | |
591d71cb AA |
1225 | status = nfs4_do_reclaim(clp, |
1226 | nfs4_nograce_recovery_ops[clp->cl_minorversion]); | |
b79a4a1b TM |
1227 | if (status < 0) { |
1228 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); | |
1229 | if (status == -NFS4ERR_STALE_CLIENTID) | |
1230 | continue; | |
1231 | if (status == -NFS4ERR_EXPIRED) | |
1232 | continue; | |
c3fad1b1 AA |
1233 | if (test_bit(NFS4CLNT_SESSION_SETUP, |
1234 | &clp->cl_state)) | |
1235 | continue; | |
b79a4a1b TM |
1236 | goto out_error; |
1237 | } else | |
1238 | nfs4_state_end_reclaim_nograce(clp); | |
1239 | continue; | |
1da177e4 | 1240 | } |
707fb4b3 TM |
1241 | |
1242 | if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { | |
1243 | nfs_client_return_marked_delegations(clp); | |
1244 | continue; | |
1245 | } | |
e005e804 TM |
1246 | |
1247 | nfs4_clear_state_manager_bit(clp); | |
f3c76491 TM |
1248 | /* Did we race with an attempt to give us more work? */ |
1249 | if (clp->cl_state == 0) | |
1250 | break; | |
1251 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) | |
1252 | break; | |
1da177e4 | 1253 | } |
e005e804 | 1254 | return; |
1da177e4 | 1255 | out_error: |
e005e804 | 1256 | printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s" |
5d8515ca | 1257 | " with error %d\n", clp->cl_hostname, -status); |
b79a4a1b TM |
1258 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
1259 | nfs4_state_end_reclaim_reboot(clp); | |
e005e804 TM |
1260 | nfs4_clear_state_manager_bit(clp); |
1261 | } | |
1262 | ||
1263 | static int nfs4_run_state_manager(void *ptr) | |
1264 | { | |
1265 | struct nfs_client *clp = ptr; | |
1266 | ||
1267 | allow_signal(SIGKILL); | |
1268 | nfs4_state_manager(clp); | |
1269 | nfs_put_client(clp); | |
1270 | module_put_and_exit(0); | |
1271 | return 0; | |
1da177e4 LT |
1272 | } |
1273 | ||
1274 | /* | |
1275 | * Local variables: | |
1276 | * c-basic-offset: 8 | |
1277 | * End: | |
1278 | */ |