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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 | ||
1da177e4 LT |
41 | #include <linux/slab.h> |
42 | #include <linux/smp_lock.h> | |
43 | #include <linux/nfs_fs.h> | |
44 | #include <linux/nfs_idmap.h> | |
5043e900 TM |
45 | #include <linux/kthread.h> |
46 | #include <linux/module.h> | |
9f958ab8 | 47 | #include <linux/random.h> |
1da177e4 LT |
48 | #include <linux/workqueue.h> |
49 | #include <linux/bitops.h> | |
50 | ||
4ce79717 | 51 | #include "nfs4_fs.h" |
1da177e4 LT |
52 | #include "callback.h" |
53 | #include "delegation.h" | |
24c8dbbb | 54 | #include "internal.h" |
1da177e4 LT |
55 | |
56 | #define OPENOWNER_POOL_SIZE 8 | |
57 | ||
4ce79717 | 58 | const nfs4_stateid zero_stateid; |
1da177e4 LT |
59 | |
60 | static LIST_HEAD(nfs4_clientid_list); | |
61 | ||
adfa6f98 | 62 | static int nfs4_init_client(struct nfs_client *clp, struct rpc_cred *cred) |
1da177e4 | 63 | { |
286d7d6a TM |
64 | int status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, |
65 | nfs_callback_tcpport, cred); | |
1da177e4 | 66 | if (status == 0) |
286d7d6a | 67 | status = nfs4_proc_setclientid_confirm(clp, cred); |
1da177e4 LT |
68 | if (status == 0) |
69 | nfs4_schedule_state_renewal(clp); | |
70 | return status; | |
71 | } | |
72 | ||
adfa6f98 | 73 | struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp) |
b4454fe1 TM |
74 | { |
75 | struct nfs4_state_owner *sp; | |
9f958ab8 | 76 | struct rb_node *pos; |
b4454fe1 TM |
77 | struct rpc_cred *cred = NULL; |
78 | ||
9f958ab8 TM |
79 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
80 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
b4454fe1 TM |
81 | if (list_empty(&sp->so_states)) |
82 | continue; | |
83 | cred = get_rpccred(sp->so_cred); | |
84 | break; | |
85 | } | |
86 | return cred; | |
87 | } | |
88 | ||
10afec90 | 89 | static struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp) |
286d7d6a TM |
90 | { |
91 | struct nfs4_state_owner *sp; | |
9f958ab8 | 92 | struct rb_node *pos; |
286d7d6a | 93 | |
9f958ab8 TM |
94 | pos = rb_first(&clp->cl_state_owners); |
95 | if (pos != NULL) { | |
96 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
286d7d6a TM |
97 | return get_rpccred(sp->so_cred); |
98 | } | |
99 | return NULL; | |
100 | } | |
101 | ||
9f958ab8 TM |
102 | static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new, |
103 | __u64 minval, int maxbits) | |
104 | { | |
105 | struct rb_node **p, *parent; | |
106 | struct nfs_unique_id *pos; | |
107 | __u64 mask = ~0ULL; | |
108 | ||
109 | if (maxbits < 64) | |
110 | mask = (1ULL << maxbits) - 1ULL; | |
111 | ||
112 | /* Ensure distribution is more or less flat */ | |
113 | get_random_bytes(&new->id, sizeof(new->id)); | |
114 | new->id &= mask; | |
115 | if (new->id < minval) | |
116 | new->id += minval; | |
117 | retry: | |
118 | p = &root->rb_node; | |
119 | parent = NULL; | |
120 | ||
121 | while (*p != NULL) { | |
122 | parent = *p; | |
123 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); | |
124 | ||
125 | if (new->id < pos->id) | |
126 | p = &(*p)->rb_left; | |
127 | else if (new->id > pos->id) | |
128 | p = &(*p)->rb_right; | |
129 | else | |
130 | goto id_exists; | |
131 | } | |
132 | rb_link_node(&new->rb_node, parent, p); | |
133 | rb_insert_color(&new->rb_node, root); | |
134 | return; | |
135 | id_exists: | |
136 | for (;;) { | |
137 | new->id++; | |
138 | if (new->id < minval || (new->id & mask) != new->id) { | |
139 | new->id = minval; | |
140 | break; | |
141 | } | |
142 | parent = rb_next(parent); | |
143 | if (parent == NULL) | |
144 | break; | |
145 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); | |
146 | if (new->id < pos->id) | |
147 | break; | |
148 | } | |
149 | goto retry; | |
150 | } | |
151 | ||
152 | static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id) | |
153 | { | |
154 | rb_erase(&id->rb_node, root); | |
155 | } | |
156 | ||
1da177e4 | 157 | static struct nfs4_state_owner * |
adfa6f98 | 158 | nfs4_find_state_owner(struct nfs_client *clp, struct rpc_cred *cred) |
1da177e4 | 159 | { |
9f958ab8 TM |
160 | struct rb_node **p = &clp->cl_state_owners.rb_node, |
161 | *parent = NULL; | |
1da177e4 LT |
162 | struct nfs4_state_owner *sp, *res = NULL; |
163 | ||
9f958ab8 TM |
164 | while (*p != NULL) { |
165 | parent = *p; | |
166 | sp = rb_entry(parent, struct nfs4_state_owner, so_client_node); | |
167 | ||
168 | if (cred < sp->so_cred) | |
169 | p = &parent->rb_left; | |
170 | else if (cred > sp->so_cred) | |
171 | p = &parent->rb_right; | |
172 | else { | |
173 | atomic_inc(&sp->so_count); | |
174 | res = sp; | |
175 | break; | |
176 | } | |
1da177e4 LT |
177 | } |
178 | return res; | |
179 | } | |
180 | ||
9f958ab8 TM |
181 | static struct nfs4_state_owner * |
182 | nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new) | |
183 | { | |
184 | struct rb_node **p = &clp->cl_state_owners.rb_node, | |
185 | *parent = NULL; | |
186 | struct nfs4_state_owner *sp; | |
187 | ||
188 | while (*p != NULL) { | |
189 | parent = *p; | |
190 | sp = rb_entry(parent, struct nfs4_state_owner, so_client_node); | |
191 | ||
192 | if (new->so_cred < sp->so_cred) | |
193 | p = &parent->rb_left; | |
194 | else if (new->so_cred > sp->so_cred) | |
195 | p = &parent->rb_right; | |
196 | else { | |
197 | atomic_inc(&sp->so_count); | |
198 | return sp; | |
199 | } | |
200 | } | |
201 | nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64); | |
202 | rb_link_node(&new->so_client_node, parent, p); | |
203 | rb_insert_color(&new->so_client_node, &clp->cl_state_owners); | |
204 | return new; | |
205 | } | |
206 | ||
207 | static void | |
208 | nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp) | |
209 | { | |
210 | if (!RB_EMPTY_NODE(&sp->so_client_node)) | |
211 | rb_erase(&sp->so_client_node, &clp->cl_state_owners); | |
212 | nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id); | |
213 | } | |
214 | ||
1da177e4 LT |
215 | /* |
216 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to | |
217 | * create a new state_owner. | |
218 | * | |
219 | */ | |
220 | static struct nfs4_state_owner * | |
221 | nfs4_alloc_state_owner(void) | |
222 | { | |
223 | struct nfs4_state_owner *sp; | |
224 | ||
cee54fc9 | 225 | sp = kzalloc(sizeof(*sp),GFP_KERNEL); |
1da177e4 LT |
226 | if (!sp) |
227 | return NULL; | |
ec073428 | 228 | spin_lock_init(&sp->so_lock); |
1da177e4 LT |
229 | INIT_LIST_HEAD(&sp->so_states); |
230 | INIT_LIST_HEAD(&sp->so_delegations); | |
cee54fc9 TM |
231 | rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue"); |
232 | sp->so_seqid.sequence = &sp->so_sequence; | |
233 | spin_lock_init(&sp->so_sequence.lock); | |
234 | INIT_LIST_HEAD(&sp->so_sequence.list); | |
1da177e4 LT |
235 | atomic_set(&sp->so_count, 1); |
236 | return sp; | |
237 | } | |
238 | ||
239 | void | |
240 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) | |
241 | { | |
9f958ab8 TM |
242 | if (!RB_EMPTY_NODE(&sp->so_client_node)) { |
243 | struct nfs_client *clp = sp->so_client; | |
244 | ||
245 | spin_lock(&clp->cl_lock); | |
246 | rb_erase(&sp->so_client_node, &clp->cl_state_owners); | |
247 | RB_CLEAR_NODE(&sp->so_client_node); | |
248 | spin_unlock(&clp->cl_lock); | |
249 | } | |
1da177e4 LT |
250 | } |
251 | ||
252 | /* | |
253 | * Note: must be called with clp->cl_sem held in order to prevent races | |
254 | * with reboot recovery! | |
255 | */ | |
256 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred) | |
257 | { | |
7539bbab | 258 | struct nfs_client *clp = server->nfs_client; |
1da177e4 LT |
259 | struct nfs4_state_owner *sp, *new; |
260 | ||
1da177e4 LT |
261 | spin_lock(&clp->cl_lock); |
262 | sp = nfs4_find_state_owner(clp, cred); | |
1da177e4 | 263 | spin_unlock(&clp->cl_lock); |
1da177e4 LT |
264 | if (sp != NULL) |
265 | return sp; | |
9f958ab8 TM |
266 | new = nfs4_alloc_state_owner(); |
267 | if (new == NULL) | |
268 | return NULL; | |
269 | new->so_client = clp; | |
270 | new->so_cred = cred; | |
271 | spin_lock(&clp->cl_lock); | |
272 | sp = nfs4_insert_state_owner(clp, new); | |
273 | spin_unlock(&clp->cl_lock); | |
274 | if (sp == new) | |
275 | get_rpccred(cred); | |
276 | else | |
277 | kfree(new); | |
278 | return sp; | |
1da177e4 LT |
279 | } |
280 | ||
281 | /* | |
282 | * Must be called with clp->cl_sem held in order to avoid races | |
283 | * with state recovery... | |
284 | */ | |
285 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) | |
286 | { | |
adfa6f98 | 287 | struct nfs_client *clp = sp->so_client; |
1da177e4 LT |
288 | struct rpc_cred *cred = sp->so_cred; |
289 | ||
290 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
291 | return; | |
9f958ab8 | 292 | nfs4_remove_state_owner(clp, sp); |
1da177e4 LT |
293 | spin_unlock(&clp->cl_lock); |
294 | put_rpccred(cred); | |
295 | kfree(sp); | |
296 | } | |
297 | ||
298 | static struct nfs4_state * | |
299 | nfs4_alloc_open_state(void) | |
300 | { | |
301 | struct nfs4_state *state; | |
302 | ||
e7616923 | 303 | state = kzalloc(sizeof(*state), GFP_KERNEL); |
1da177e4 LT |
304 | if (!state) |
305 | return NULL; | |
1da177e4 LT |
306 | atomic_set(&state->count, 1); |
307 | INIT_LIST_HEAD(&state->lock_states); | |
8d0a8a9d | 308 | spin_lock_init(&state->state_lock); |
1da177e4 LT |
309 | return state; |
310 | } | |
311 | ||
4cecb76f TM |
312 | void |
313 | nfs4_state_set_mode_locked(struct nfs4_state *state, mode_t mode) | |
314 | { | |
315 | if (state->state == mode) | |
316 | return; | |
317 | /* NB! List reordering - see the reclaim code for why. */ | |
318 | if ((mode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { | |
319 | if (mode & FMODE_WRITE) | |
320 | list_move(&state->open_states, &state->owner->so_states); | |
321 | else | |
322 | list_move_tail(&state->open_states, &state->owner->so_states); | |
323 | } | |
324 | if (mode == 0) | |
325 | list_del_init(&state->inode_states); | |
326 | state->state = mode; | |
327 | } | |
328 | ||
1da177e4 LT |
329 | static struct nfs4_state * |
330 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
331 | { | |
332 | struct nfs_inode *nfsi = NFS_I(inode); | |
333 | struct nfs4_state *state; | |
334 | ||
335 | list_for_each_entry(state, &nfsi->open_states, inode_states) { | |
1c816efa | 336 | if (state->owner != owner) |
1da177e4 | 337 | continue; |
1c816efa | 338 | if (atomic_inc_not_zero(&state->count)) |
1da177e4 | 339 | return state; |
1da177e4 LT |
340 | } |
341 | return NULL; | |
342 | } | |
343 | ||
1da177e4 LT |
344 | static void |
345 | nfs4_free_open_state(struct nfs4_state *state) | |
346 | { | |
347 | kfree(state); | |
348 | } | |
349 | ||
350 | struct nfs4_state * | |
351 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
352 | { | |
353 | struct nfs4_state *state, *new; | |
354 | struct nfs_inode *nfsi = NFS_I(inode); | |
355 | ||
356 | spin_lock(&inode->i_lock); | |
357 | state = __nfs4_find_state_byowner(inode, owner); | |
358 | spin_unlock(&inode->i_lock); | |
359 | if (state) | |
360 | goto out; | |
361 | new = nfs4_alloc_open_state(); | |
ec073428 | 362 | spin_lock(&owner->so_lock); |
1da177e4 LT |
363 | spin_lock(&inode->i_lock); |
364 | state = __nfs4_find_state_byowner(inode, owner); | |
365 | if (state == NULL && new != NULL) { | |
366 | state = new; | |
1da177e4 LT |
367 | state->owner = owner; |
368 | atomic_inc(&owner->so_count); | |
369 | list_add(&state->inode_states, &nfsi->open_states); | |
370 | state->inode = igrab(inode); | |
371 | spin_unlock(&inode->i_lock); | |
ec073428 TM |
372 | /* Note: The reclaim code dictates that we add stateless |
373 | * and read-only stateids to the end of the list */ | |
374 | list_add_tail(&state->open_states, &owner->so_states); | |
375 | spin_unlock(&owner->so_lock); | |
1da177e4 LT |
376 | } else { |
377 | spin_unlock(&inode->i_lock); | |
ec073428 | 378 | spin_unlock(&owner->so_lock); |
1da177e4 LT |
379 | if (new) |
380 | nfs4_free_open_state(new); | |
381 | } | |
382 | out: | |
383 | return state; | |
384 | } | |
385 | ||
386 | /* | |
387 | * Beware! Caller must be holding exactly one | |
e6dfa553 | 388 | * reference to clp->cl_sem! |
1da177e4 LT |
389 | */ |
390 | void nfs4_put_open_state(struct nfs4_state *state) | |
391 | { | |
392 | struct inode *inode = state->inode; | |
393 | struct nfs4_state_owner *owner = state->owner; | |
394 | ||
ec073428 | 395 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
1da177e4 | 396 | return; |
ec073428 | 397 | spin_lock(&inode->i_lock); |
1da177e4 LT |
398 | if (!list_empty(&state->inode_states)) |
399 | list_del(&state->inode_states); | |
1da177e4 | 400 | list_del(&state->open_states); |
ec073428 TM |
401 | spin_unlock(&inode->i_lock); |
402 | spin_unlock(&owner->so_lock); | |
1da177e4 | 403 | iput(inode); |
1da177e4 LT |
404 | nfs4_free_open_state(state); |
405 | nfs4_put_state_owner(owner); | |
406 | } | |
407 | ||
408 | /* | |
83c9d41e | 409 | * Close the current file. |
1da177e4 | 410 | */ |
4a35bd41 | 411 | void nfs4_close_state(struct path *path, struct nfs4_state *state, mode_t mode) |
1da177e4 LT |
412 | { |
413 | struct inode *inode = state->inode; | |
414 | struct nfs4_state_owner *owner = state->owner; | |
003707c7 TM |
415 | int call_close = 0; |
416 | int newstate; | |
1da177e4 LT |
417 | |
418 | atomic_inc(&owner->so_count); | |
1da177e4 | 419 | /* Protect against nfs4_find_state() */ |
ec073428 | 420 | spin_lock(&owner->so_lock); |
1da177e4 | 421 | spin_lock(&inode->i_lock); |
e7616923 TM |
422 | switch (mode & (FMODE_READ | FMODE_WRITE)) { |
423 | case FMODE_READ: | |
424 | state->n_rdonly--; | |
425 | break; | |
426 | case FMODE_WRITE: | |
427 | state->n_wronly--; | |
428 | break; | |
429 | case FMODE_READ|FMODE_WRITE: | |
430 | state->n_rdwr--; | |
431 | } | |
003707c7 | 432 | newstate = FMODE_READ|FMODE_WRITE; |
e7616923 | 433 | if (state->n_rdwr == 0) { |
003707c7 | 434 | if (state->n_rdonly == 0) { |
e7616923 | 435 | newstate &= ~FMODE_READ; |
003707c7 TM |
436 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
437 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
438 | } | |
439 | if (state->n_wronly == 0) { | |
e7616923 | 440 | newstate &= ~FMODE_WRITE; |
003707c7 TM |
441 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
442 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
443 | } | |
444 | if (newstate == 0) | |
445 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
e7616923 | 446 | } |
003707c7 | 447 | nfs4_state_set_mode_locked(state, newstate); |
1da177e4 | 448 | spin_unlock(&inode->i_lock); |
ec073428 | 449 | spin_unlock(&owner->so_lock); |
4cecb76f | 450 | |
003707c7 | 451 | if (!call_close) { |
b39e625b TM |
452 | nfs4_put_open_state(state); |
453 | nfs4_put_state_owner(owner); | |
454 | } else | |
455 | nfs4_do_close(path, state); | |
1da177e4 LT |
456 | } |
457 | ||
458 | /* | |
459 | * Search the state->lock_states for an existing lock_owner | |
460 | * that is compatible with current->files | |
461 | */ | |
462 | static struct nfs4_lock_state * | |
463 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) | |
464 | { | |
465 | struct nfs4_lock_state *pos; | |
466 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
467 | if (pos->ls_owner != fl_owner) | |
468 | continue; | |
469 | atomic_inc(&pos->ls_count); | |
470 | return pos; | |
471 | } | |
472 | return NULL; | |
473 | } | |
474 | ||
1da177e4 LT |
475 | /* |
476 | * Return a compatible lock_state. If no initialized lock_state structure | |
477 | * exists, return an uninitialized one. | |
478 | * | |
1da177e4 LT |
479 | */ |
480 | static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) | |
481 | { | |
482 | struct nfs4_lock_state *lsp; | |
adfa6f98 | 483 | struct nfs_client *clp = state->owner->so_client; |
1da177e4 | 484 | |
cee54fc9 | 485 | lsp = kzalloc(sizeof(*lsp), GFP_KERNEL); |
1da177e4 LT |
486 | if (lsp == NULL) |
487 | return NULL; | |
cee54fc9 | 488 | lsp->ls_seqid.sequence = &state->owner->so_sequence; |
1da177e4 LT |
489 | atomic_set(&lsp->ls_count, 1); |
490 | lsp->ls_owner = fl_owner; | |
1da177e4 | 491 | spin_lock(&clp->cl_lock); |
9f958ab8 | 492 | nfs_alloc_unique_id(&clp->cl_lockowner_id, &lsp->ls_id, 1, 64); |
1da177e4 | 493 | spin_unlock(&clp->cl_lock); |
8d0a8a9d | 494 | INIT_LIST_HEAD(&lsp->ls_locks); |
1da177e4 LT |
495 | return lsp; |
496 | } | |
497 | ||
9f958ab8 TM |
498 | static void nfs4_free_lock_state(struct nfs4_lock_state *lsp) |
499 | { | |
500 | struct nfs_client *clp = lsp->ls_state->owner->so_client; | |
501 | ||
502 | spin_lock(&clp->cl_lock); | |
503 | nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id); | |
504 | spin_unlock(&clp->cl_lock); | |
505 | kfree(lsp); | |
506 | } | |
507 | ||
1da177e4 LT |
508 | /* |
509 | * Return a compatible lock_state. If no initialized lock_state structure | |
510 | * exists, return an uninitialized one. | |
511 | * | |
e6dfa553 | 512 | * The caller must be holding clp->cl_sem |
1da177e4 | 513 | */ |
8d0a8a9d | 514 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner) |
1da177e4 | 515 | { |
8d0a8a9d | 516 | struct nfs4_lock_state *lsp, *new = NULL; |
1da177e4 | 517 | |
8d0a8a9d TM |
518 | for(;;) { |
519 | spin_lock(&state->state_lock); | |
520 | lsp = __nfs4_find_lock_state(state, owner); | |
521 | if (lsp != NULL) | |
522 | break; | |
523 | if (new != NULL) { | |
524 | new->ls_state = state; | |
525 | list_add(&new->ls_locks, &state->lock_states); | |
526 | set_bit(LK_STATE_IN_USE, &state->flags); | |
527 | lsp = new; | |
528 | new = NULL; | |
529 | break; | |
530 | } | |
531 | spin_unlock(&state->state_lock); | |
532 | new = nfs4_alloc_lock_state(state, owner); | |
533 | if (new == NULL) | |
534 | return NULL; | |
535 | } | |
536 | spin_unlock(&state->state_lock); | |
9f958ab8 TM |
537 | if (new != NULL) |
538 | nfs4_free_lock_state(new); | |
1da177e4 LT |
539 | return lsp; |
540 | } | |
541 | ||
542 | /* | |
8d0a8a9d TM |
543 | * Release reference to lock_state, and free it if we see that |
544 | * it is no longer in use | |
1da177e4 | 545 | */ |
faf5f49c | 546 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
1da177e4 | 547 | { |
8d0a8a9d | 548 | struct nfs4_state *state; |
1da177e4 | 549 | |
8d0a8a9d TM |
550 | if (lsp == NULL) |
551 | return; | |
552 | state = lsp->ls_state; | |
553 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) | |
554 | return; | |
555 | list_del(&lsp->ls_locks); | |
556 | if (list_empty(&state->lock_states)) | |
557 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
558 | spin_unlock(&state->state_lock); | |
9f958ab8 | 559 | nfs4_free_lock_state(lsp); |
1da177e4 LT |
560 | } |
561 | ||
8d0a8a9d | 562 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
1da177e4 | 563 | { |
8d0a8a9d | 564 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
1da177e4 | 565 | |
8d0a8a9d TM |
566 | dst->fl_u.nfs4_fl.owner = lsp; |
567 | atomic_inc(&lsp->ls_count); | |
568 | } | |
1da177e4 | 569 | |
8d0a8a9d | 570 | static void nfs4_fl_release_lock(struct file_lock *fl) |
1da177e4 | 571 | { |
8d0a8a9d | 572 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
1da177e4 LT |
573 | } |
574 | ||
8d0a8a9d TM |
575 | static struct file_lock_operations nfs4_fl_lock_ops = { |
576 | .fl_copy_lock = nfs4_fl_copy_lock, | |
577 | .fl_release_private = nfs4_fl_release_lock, | |
578 | }; | |
579 | ||
580 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
1da177e4 | 581 | { |
8d0a8a9d TM |
582 | struct nfs4_lock_state *lsp; |
583 | ||
584 | if (fl->fl_ops != NULL) | |
585 | return 0; | |
586 | lsp = nfs4_get_lock_state(state, fl->fl_owner); | |
587 | if (lsp == NULL) | |
588 | return -ENOMEM; | |
589 | fl->fl_u.nfs4_fl.owner = lsp; | |
590 | fl->fl_ops = &nfs4_fl_lock_ops; | |
591 | return 0; | |
1da177e4 LT |
592 | } |
593 | ||
8d0a8a9d TM |
594 | /* |
595 | * Byte-range lock aware utility to initialize the stateid of read/write | |
596 | * requests. | |
1da177e4 | 597 | */ |
8d0a8a9d | 598 | void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner) |
1da177e4 | 599 | { |
8d0a8a9d | 600 | struct nfs4_lock_state *lsp; |
1da177e4 | 601 | |
8d0a8a9d TM |
602 | memcpy(dst, &state->stateid, sizeof(*dst)); |
603 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) | |
604 | return; | |
1da177e4 | 605 | |
8d0a8a9d TM |
606 | spin_lock(&state->state_lock); |
607 | lsp = __nfs4_find_lock_state(state, fl_owner); | |
608 | if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) | |
609 | memcpy(dst, &lsp->ls_stateid, sizeof(*dst)); | |
610 | spin_unlock(&state->state_lock); | |
1da177e4 LT |
611 | nfs4_put_lock_state(lsp); |
612 | } | |
613 | ||
cee54fc9 TM |
614 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter) |
615 | { | |
36f20c6d | 616 | struct rpc_sequence *sequence = counter->sequence; |
cee54fc9 TM |
617 | struct nfs_seqid *new; |
618 | ||
619 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
620 | if (new != NULL) { | |
621 | new->sequence = counter; | |
36f20c6d TM |
622 | spin_lock(&sequence->lock); |
623 | list_add_tail(&new->list, &sequence->list); | |
624 | spin_unlock(&sequence->lock); | |
cee54fc9 TM |
625 | } |
626 | return new; | |
627 | } | |
628 | ||
629 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
1da177e4 | 630 | { |
cee54fc9 | 631 | struct rpc_sequence *sequence = seqid->sequence->sequence; |
cee54fc9 | 632 | |
36f20c6d TM |
633 | spin_lock(&sequence->lock); |
634 | list_del(&seqid->list); | |
635 | spin_unlock(&sequence->lock); | |
636 | rpc_wake_up(&sequence->wait); | |
cee54fc9 | 637 | kfree(seqid); |
1da177e4 LT |
638 | } |
639 | ||
640 | /* | |
cee54fc9 TM |
641 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
642 | * failed with a seqid incrementing error - | |
643 | * see comments nfs_fs.h:seqid_mutating_error() | |
644 | */ | |
88d90939 | 645 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
cee54fc9 TM |
646 | { |
647 | switch (status) { | |
648 | case 0: | |
649 | break; | |
650 | case -NFS4ERR_BAD_SEQID: | |
651 | case -NFS4ERR_STALE_CLIENTID: | |
652 | case -NFS4ERR_STALE_STATEID: | |
653 | case -NFS4ERR_BAD_STATEID: | |
654 | case -NFS4ERR_BADXDR: | |
655 | case -NFS4ERR_RESOURCE: | |
656 | case -NFS4ERR_NOFILEHANDLE: | |
657 | /* Non-seqid mutating errors */ | |
658 | return; | |
659 | }; | |
660 | /* | |
661 | * Note: no locking needed as we are guaranteed to be first | |
662 | * on the sequence list | |
663 | */ | |
664 | seqid->sequence->counter++; | |
665 | } | |
666 | ||
667 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
668 | { | |
669 | if (status == -NFS4ERR_BAD_SEQID) { | |
670 | struct nfs4_state_owner *sp = container_of(seqid->sequence, | |
671 | struct nfs4_state_owner, so_seqid); | |
1da177e4 | 672 | nfs4_drop_state_owner(sp); |
cee54fc9 | 673 | } |
88d90939 | 674 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
675 | } |
676 | ||
677 | /* | |
cee54fc9 TM |
678 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
679 | * failed with a seqid incrementing error - | |
680 | * see comments nfs_fs.h:seqid_mutating_error() | |
681 | */ | |
682 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
683 | { | |
88d90939 | 684 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
685 | } |
686 | ||
687 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
688 | { | |
689 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
690 | int status = 0; | |
691 | ||
4e51336a TM |
692 | if (sequence->list.next == &seqid->list) |
693 | goto out; | |
cee54fc9 | 694 | spin_lock(&sequence->lock); |
36f20c6d | 695 | if (sequence->list.next != &seqid->list) { |
cee54fc9 TM |
696 | rpc_sleep_on(&sequence->wait, task, NULL, NULL); |
697 | status = -EAGAIN; | |
36f20c6d | 698 | } |
cee54fc9 | 699 | spin_unlock(&sequence->lock); |
4e51336a | 700 | out: |
cee54fc9 | 701 | return status; |
1da177e4 LT |
702 | } |
703 | ||
704 | static int reclaimer(void *); | |
1da177e4 | 705 | |
adfa6f98 | 706 | static inline void nfs4_clear_recover_bit(struct nfs_client *clp) |
433fbe4c TM |
707 | { |
708 | smp_mb__before_clear_bit(); | |
709 | clear_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state); | |
710 | smp_mb__after_clear_bit(); | |
711 | wake_up_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER); | |
712 | rpc_wake_up(&clp->cl_rpcwaitq); | |
713 | } | |
714 | ||
1da177e4 LT |
715 | /* |
716 | * State recovery routine | |
717 | */ | |
adfa6f98 | 718 | static void nfs4_recover_state(struct nfs_client *clp) |
1da177e4 | 719 | { |
5043e900 | 720 | struct task_struct *task; |
1da177e4 | 721 | |
5043e900 TM |
722 | __module_get(THIS_MODULE); |
723 | atomic_inc(&clp->cl_count); | |
724 | task = kthread_run(reclaimer, clp, "%u.%u.%u.%u-reclaim", | |
24c8dbbb | 725 | NIPQUAD(clp->cl_addr.sin_addr)); |
5043e900 TM |
726 | if (!IS_ERR(task)) |
727 | return; | |
433fbe4c | 728 | nfs4_clear_recover_bit(clp); |
24c8dbbb | 729 | nfs_put_client(clp); |
5043e900 | 730 | module_put(THIS_MODULE); |
1da177e4 LT |
731 | } |
732 | ||
733 | /* | |
734 | * Schedule a state recovery attempt | |
735 | */ | |
adfa6f98 | 736 | void nfs4_schedule_state_recovery(struct nfs_client *clp) |
1da177e4 LT |
737 | { |
738 | if (!clp) | |
739 | return; | |
433fbe4c | 740 | if (test_and_set_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0) |
5043e900 | 741 | nfs4_recover_state(clp); |
1da177e4 LT |
742 | } |
743 | ||
744 | static int nfs4_reclaim_locks(struct nfs4_state_recovery_ops *ops, struct nfs4_state *state) | |
745 | { | |
746 | struct inode *inode = state->inode; | |
747 | struct file_lock *fl; | |
748 | int status = 0; | |
749 | ||
750 | for (fl = inode->i_flock; fl != 0; fl = fl->fl_next) { | |
43b2a33a | 751 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
1da177e4 LT |
752 | continue; |
753 | if (((struct nfs_open_context *)fl->fl_file->private_data)->state != state) | |
754 | continue; | |
755 | status = ops->recover_lock(state, fl); | |
756 | if (status >= 0) | |
757 | continue; | |
758 | switch (status) { | |
759 | default: | |
760 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
761 | __FUNCTION__, status); | |
762 | case -NFS4ERR_EXPIRED: | |
763 | case -NFS4ERR_NO_GRACE: | |
764 | case -NFS4ERR_RECLAIM_BAD: | |
765 | case -NFS4ERR_RECLAIM_CONFLICT: | |
43b2a33a | 766 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
1da177e4 LT |
767 | break; |
768 | case -NFS4ERR_STALE_CLIENTID: | |
769 | goto out_err; | |
770 | } | |
771 | } | |
772 | return 0; | |
773 | out_err: | |
774 | return status; | |
775 | } | |
776 | ||
777 | static int nfs4_reclaim_open_state(struct nfs4_state_recovery_ops *ops, struct nfs4_state_owner *sp) | |
778 | { | |
779 | struct nfs4_state *state; | |
780 | struct nfs4_lock_state *lock; | |
781 | int status = 0; | |
782 | ||
783 | /* Note: we rely on the sp->so_states list being ordered | |
784 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
785 | * states first. | |
786 | * This is needed to ensure that the server won't give us any | |
787 | * read delegations that we have to return if, say, we are | |
788 | * recovering after a network partition or a reboot from a | |
789 | * server that doesn't support a grace period. | |
790 | */ | |
791 | list_for_each_entry(state, &sp->so_states, open_states) { | |
792 | if (state->state == 0) | |
793 | continue; | |
794 | status = ops->recover_open(sp, state); | |
1da177e4 LT |
795 | if (status >= 0) { |
796 | status = nfs4_reclaim_locks(ops, state); | |
797 | if (status < 0) | |
798 | goto out_err; | |
799 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
800 | if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) | |
801 | printk("%s: Lock reclaim failed!\n", | |
802 | __FUNCTION__); | |
803 | } | |
804 | continue; | |
805 | } | |
806 | switch (status) { | |
807 | default: | |
808 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
809 | __FUNCTION__, status); | |
810 | case -ENOENT: | |
811 | case -NFS4ERR_RECLAIM_BAD: | |
812 | case -NFS4ERR_RECLAIM_CONFLICT: | |
813 | /* | |
814 | * Open state on this file cannot be recovered | |
815 | * All we can do is revert to using the zero stateid. | |
816 | */ | |
817 | memset(state->stateid.data, 0, | |
818 | sizeof(state->stateid.data)); | |
819 | /* Mark the file as being 'closed' */ | |
820 | state->state = 0; | |
821 | break; | |
822 | case -NFS4ERR_EXPIRED: | |
823 | case -NFS4ERR_NO_GRACE: | |
824 | case -NFS4ERR_STALE_CLIENTID: | |
825 | goto out_err; | |
826 | } | |
827 | } | |
828 | return 0; | |
829 | out_err: | |
830 | return status; | |
831 | } | |
832 | ||
adfa6f98 | 833 | static void nfs4_state_mark_reclaim(struct nfs_client *clp) |
cee54fc9 TM |
834 | { |
835 | struct nfs4_state_owner *sp; | |
9f958ab8 | 836 | struct rb_node *pos; |
cee54fc9 TM |
837 | struct nfs4_state *state; |
838 | struct nfs4_lock_state *lock; | |
839 | ||
840 | /* Reset all sequence ids to zero */ | |
9f958ab8 TM |
841 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
842 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
cee54fc9 TM |
843 | sp->so_seqid.counter = 0; |
844 | sp->so_seqid.flags = 0; | |
ec073428 | 845 | spin_lock(&sp->so_lock); |
cee54fc9 | 846 | list_for_each_entry(state, &sp->so_states, open_states) { |
003707c7 TM |
847 | clear_bit(NFS_DELEGATED_STATE, &state->flags); |
848 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); | |
849 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); | |
850 | clear_bit(NFS_O_RDWR_STATE, &state->flags); | |
cee54fc9 TM |
851 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
852 | lock->ls_seqid.counter = 0; | |
853 | lock->ls_seqid.flags = 0; | |
854 | lock->ls_flags &= ~NFS_LOCK_INITIALIZED; | |
855 | } | |
856 | } | |
ec073428 | 857 | spin_unlock(&sp->so_lock); |
cee54fc9 TM |
858 | } |
859 | } | |
860 | ||
1da177e4 LT |
861 | static int reclaimer(void *ptr) |
862 | { | |
adfa6f98 | 863 | struct nfs_client *clp = ptr; |
1da177e4 | 864 | struct nfs4_state_owner *sp; |
9f958ab8 | 865 | struct rb_node *pos; |
1da177e4 | 866 | struct nfs4_state_recovery_ops *ops; |
286d7d6a | 867 | struct rpc_cred *cred; |
1da177e4 LT |
868 | int status = 0; |
869 | ||
1da177e4 LT |
870 | allow_signal(SIGKILL); |
871 | ||
1da177e4 LT |
872 | /* Ensure exclusive access to NFSv4 state */ |
873 | lock_kernel(); | |
874 | down_write(&clp->cl_sem); | |
875 | /* Are there any NFS mounts out there? */ | |
876 | if (list_empty(&clp->cl_superblocks)) | |
877 | goto out; | |
878 | restart_loop: | |
286d7d6a TM |
879 | ops = &nfs4_network_partition_recovery_ops; |
880 | /* Are there any open files on this volume? */ | |
881 | cred = nfs4_get_renew_cred(clp); | |
882 | if (cred != NULL) { | |
883 | /* Yes there are: try to renew the old lease */ | |
884 | status = nfs4_proc_renew(clp, cred); | |
885 | switch (status) { | |
886 | case 0: | |
887 | case -NFS4ERR_CB_PATH_DOWN: | |
888 | put_rpccred(cred); | |
889 | goto out; | |
890 | case -NFS4ERR_STALE_CLIENTID: | |
891 | case -NFS4ERR_LEASE_MOVED: | |
892 | ops = &nfs4_reboot_recovery_ops; | |
893 | } | |
894 | } else { | |
895 | /* "reboot" to ensure we clear all state on the server */ | |
896 | clp->cl_boot_time = CURRENT_TIME; | |
897 | cred = nfs4_get_setclientid_cred(clp); | |
898 | } | |
899 | /* We're going to have to re-establish a clientid */ | |
cee54fc9 | 900 | nfs4_state_mark_reclaim(clp); |
286d7d6a TM |
901 | status = -ENOENT; |
902 | if (cred != NULL) { | |
903 | status = nfs4_init_client(clp, cred); | |
904 | put_rpccred(cred); | |
905 | } | |
1da177e4 LT |
906 | if (status) |
907 | goto out_error; | |
908 | /* Mark all delegations for reclaim */ | |
909 | nfs_delegation_mark_reclaim(clp); | |
910 | /* Note: list is protected by exclusive lock on cl->cl_sem */ | |
9f958ab8 TM |
911 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
912 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); | |
1da177e4 LT |
913 | status = nfs4_reclaim_open_state(ops, sp); |
914 | if (status < 0) { | |
915 | if (status == -NFS4ERR_NO_GRACE) { | |
916 | ops = &nfs4_network_partition_recovery_ops; | |
917 | status = nfs4_reclaim_open_state(ops, sp); | |
918 | } | |
919 | if (status == -NFS4ERR_STALE_CLIENTID) | |
920 | goto restart_loop; | |
921 | if (status == -NFS4ERR_EXPIRED) | |
922 | goto restart_loop; | |
923 | } | |
924 | } | |
925 | nfs_delegation_reap_unclaimed(clp); | |
926 | out: | |
1da177e4 LT |
927 | up_write(&clp->cl_sem); |
928 | unlock_kernel(); | |
1da177e4 LT |
929 | if (status == -NFS4ERR_CB_PATH_DOWN) |
930 | nfs_handle_cb_pathdown(clp); | |
433fbe4c | 931 | nfs4_clear_recover_bit(clp); |
24c8dbbb | 932 | nfs_put_client(clp); |
5043e900 | 933 | module_put_and_exit(0); |
1da177e4 LT |
934 | return 0; |
935 | out_error: | |
936 | printk(KERN_WARNING "Error: state recovery failed on NFSv4 server %u.%u.%u.%u with error %d\n", | |
24c8dbbb | 937 | NIPQUAD(clp->cl_addr.sin_addr), -status); |
51581f3b | 938 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
1da177e4 LT |
939 | goto out; |
940 | } | |
941 | ||
942 | /* | |
943 | * Local variables: | |
944 | * c-basic-offset: 8 | |
945 | * End: | |
946 | */ |