]>
Commit | Line | Data |
---|---|---|
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> | |
1da177e4 LT |
47 | #include <linux/workqueue.h> |
48 | #include <linux/bitops.h> | |
49 | ||
4ce79717 | 50 | #include "nfs4_fs.h" |
1da177e4 LT |
51 | #include "callback.h" |
52 | #include "delegation.h" | |
53 | ||
54 | #define OPENOWNER_POOL_SIZE 8 | |
55 | ||
4ce79717 | 56 | const nfs4_stateid zero_stateid; |
1da177e4 | 57 | |
4ce79717 | 58 | static DEFINE_SPINLOCK(state_spinlock); |
1da177e4 LT |
59 | static LIST_HEAD(nfs4_clientid_list); |
60 | ||
1da177e4 LT |
61 | void |
62 | init_nfsv4_state(struct nfs_server *server) | |
63 | { | |
7539bbab | 64 | server->nfs_client = NULL; |
1da177e4 LT |
65 | INIT_LIST_HEAD(&server->nfs4_siblings); |
66 | } | |
67 | ||
68 | void | |
69 | destroy_nfsv4_state(struct nfs_server *server) | |
70 | { | |
f99d49ad JJ |
71 | kfree(server->mnt_path); |
72 | server->mnt_path = NULL; | |
7539bbab DH |
73 | if (server->nfs_client) { |
74 | nfs4_put_client(server->nfs_client); | |
75 | server->nfs_client = NULL; | |
1da177e4 LT |
76 | } |
77 | } | |
78 | ||
79 | /* | |
80 | * nfs4_get_client(): returns an empty client structure | |
81 | * nfs4_put_client(): drops reference to client structure | |
82 | * | |
83 | * Since these are allocated/deallocated very rarely, we don't | |
84 | * bother putting them in a slab cache... | |
85 | */ | |
adfa6f98 | 86 | static struct nfs_client * |
1da177e4 LT |
87 | nfs4_alloc_client(struct in_addr *addr) |
88 | { | |
adfa6f98 | 89 | struct nfs_client *clp; |
1da177e4 LT |
90 | |
91 | if (nfs_callback_up() < 0) | |
92 | return NULL; | |
286d7d6a | 93 | if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) { |
1da177e4 LT |
94 | nfs_callback_down(); |
95 | return NULL; | |
96 | } | |
1da177e4 LT |
97 | memcpy(&clp->cl_addr, addr, sizeof(clp->cl_addr)); |
98 | init_rwsem(&clp->cl_sem); | |
99 | INIT_LIST_HEAD(&clp->cl_delegations); | |
100 | INIT_LIST_HEAD(&clp->cl_state_owners); | |
101 | INIT_LIST_HEAD(&clp->cl_unused); | |
102 | spin_lock_init(&clp->cl_lock); | |
103 | atomic_set(&clp->cl_count, 1); | |
1da177e4 LT |
104 | INIT_WORK(&clp->cl_renewd, nfs4_renew_state, clp); |
105 | INIT_LIST_HEAD(&clp->cl_superblocks); | |
1da177e4 | 106 | rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS4 client"); |
6a19275a | 107 | clp->cl_rpcclient = ERR_PTR(-EINVAL); |
1da177e4 | 108 | clp->cl_boot_time = CURRENT_TIME; |
286d7d6a | 109 | clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; |
1da177e4 LT |
110 | return clp; |
111 | } | |
112 | ||
113 | static void | |
adfa6f98 | 114 | nfs4_free_client(struct nfs_client *clp) |
1da177e4 LT |
115 | { |
116 | struct nfs4_state_owner *sp; | |
117 | ||
118 | while (!list_empty(&clp->cl_unused)) { | |
119 | sp = list_entry(clp->cl_unused.next, | |
120 | struct nfs4_state_owner, | |
121 | so_list); | |
122 | list_del(&sp->so_list); | |
123 | kfree(sp); | |
124 | } | |
125 | BUG_ON(!list_empty(&clp->cl_state_owners)); | |
1da177e4 | 126 | nfs_idmap_delete(clp); |
6a19275a | 127 | if (!IS_ERR(clp->cl_rpcclient)) |
1da177e4 LT |
128 | rpc_shutdown_client(clp->cl_rpcclient); |
129 | kfree(clp); | |
130 | nfs_callback_down(); | |
131 | } | |
132 | ||
adfa6f98 | 133 | static struct nfs_client *__nfs4_find_client(struct in_addr *addr) |
1da177e4 | 134 | { |
adfa6f98 | 135 | struct nfs_client *clp; |
1da177e4 LT |
136 | list_for_each_entry(clp, &nfs4_clientid_list, cl_servers) { |
137 | if (memcmp(&clp->cl_addr, addr, sizeof(clp->cl_addr)) == 0) { | |
138 | atomic_inc(&clp->cl_count); | |
139 | return clp; | |
140 | } | |
141 | } | |
142 | return NULL; | |
143 | } | |
144 | ||
adfa6f98 | 145 | struct nfs_client *nfs4_find_client(struct in_addr *addr) |
1da177e4 | 146 | { |
adfa6f98 | 147 | struct nfs_client *clp; |
1da177e4 LT |
148 | spin_lock(&state_spinlock); |
149 | clp = __nfs4_find_client(addr); | |
150 | spin_unlock(&state_spinlock); | |
151 | return clp; | |
152 | } | |
153 | ||
adfa6f98 | 154 | struct nfs_client * |
1da177e4 LT |
155 | nfs4_get_client(struct in_addr *addr) |
156 | { | |
adfa6f98 | 157 | struct nfs_client *clp, *new = NULL; |
1da177e4 LT |
158 | |
159 | spin_lock(&state_spinlock); | |
160 | for (;;) { | |
161 | clp = __nfs4_find_client(addr); | |
162 | if (clp != NULL) | |
163 | break; | |
164 | clp = new; | |
165 | if (clp != NULL) { | |
166 | list_add(&clp->cl_servers, &nfs4_clientid_list); | |
167 | new = NULL; | |
168 | break; | |
169 | } | |
170 | spin_unlock(&state_spinlock); | |
171 | new = nfs4_alloc_client(addr); | |
172 | spin_lock(&state_spinlock); | |
173 | if (new == NULL) | |
174 | break; | |
175 | } | |
176 | spin_unlock(&state_spinlock); | |
177 | if (new) | |
178 | nfs4_free_client(new); | |
179 | return clp; | |
180 | } | |
181 | ||
182 | void | |
adfa6f98 | 183 | nfs4_put_client(struct nfs_client *clp) |
1da177e4 LT |
184 | { |
185 | if (!atomic_dec_and_lock(&clp->cl_count, &state_spinlock)) | |
186 | return; | |
187 | list_del(&clp->cl_servers); | |
188 | spin_unlock(&state_spinlock); | |
189 | BUG_ON(!list_empty(&clp->cl_superblocks)); | |
1da177e4 LT |
190 | rpc_wake_up(&clp->cl_rpcwaitq); |
191 | nfs4_kill_renewd(clp); | |
192 | nfs4_free_client(clp); | |
193 | } | |
194 | ||
adfa6f98 | 195 | static int nfs4_init_client(struct nfs_client *clp, struct rpc_cred *cred) |
1da177e4 | 196 | { |
286d7d6a TM |
197 | int status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, |
198 | nfs_callback_tcpport, cred); | |
1da177e4 | 199 | if (status == 0) |
286d7d6a | 200 | status = nfs4_proc_setclientid_confirm(clp, cred); |
1da177e4 LT |
201 | if (status == 0) |
202 | nfs4_schedule_state_renewal(clp); | |
203 | return status; | |
204 | } | |
205 | ||
1da177e4 | 206 | u32 |
adfa6f98 | 207 | nfs4_alloc_lockowner_id(struct nfs_client *clp) |
1da177e4 LT |
208 | { |
209 | return clp->cl_lockowner_id ++; | |
210 | } | |
211 | ||
212 | static struct nfs4_state_owner * | |
adfa6f98 | 213 | nfs4_client_grab_unused(struct nfs_client *clp, struct rpc_cred *cred) |
1da177e4 LT |
214 | { |
215 | struct nfs4_state_owner *sp = NULL; | |
216 | ||
217 | if (!list_empty(&clp->cl_unused)) { | |
218 | sp = list_entry(clp->cl_unused.next, struct nfs4_state_owner, so_list); | |
219 | atomic_inc(&sp->so_count); | |
220 | sp->so_cred = cred; | |
221 | list_move(&sp->so_list, &clp->cl_state_owners); | |
222 | clp->cl_nunused--; | |
223 | } | |
224 | return sp; | |
225 | } | |
226 | ||
adfa6f98 | 227 | struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp) |
b4454fe1 TM |
228 | { |
229 | struct nfs4_state_owner *sp; | |
230 | struct rpc_cred *cred = NULL; | |
231 | ||
232 | list_for_each_entry(sp, &clp->cl_state_owners, so_list) { | |
233 | if (list_empty(&sp->so_states)) | |
234 | continue; | |
235 | cred = get_rpccred(sp->so_cred); | |
236 | break; | |
237 | } | |
238 | return cred; | |
239 | } | |
240 | ||
adfa6f98 | 241 | struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp) |
286d7d6a TM |
242 | { |
243 | struct nfs4_state_owner *sp; | |
244 | ||
245 | if (!list_empty(&clp->cl_state_owners)) { | |
246 | sp = list_entry(clp->cl_state_owners.next, | |
247 | struct nfs4_state_owner, so_list); | |
248 | return get_rpccred(sp->so_cred); | |
249 | } | |
250 | return NULL; | |
251 | } | |
252 | ||
1da177e4 | 253 | static struct nfs4_state_owner * |
adfa6f98 | 254 | nfs4_find_state_owner(struct nfs_client *clp, struct rpc_cred *cred) |
1da177e4 LT |
255 | { |
256 | struct nfs4_state_owner *sp, *res = NULL; | |
257 | ||
258 | list_for_each_entry(sp, &clp->cl_state_owners, so_list) { | |
259 | if (sp->so_cred != cred) | |
260 | continue; | |
261 | atomic_inc(&sp->so_count); | |
262 | /* Move to the head of the list */ | |
263 | list_move(&sp->so_list, &clp->cl_state_owners); | |
264 | res = sp; | |
265 | break; | |
266 | } | |
267 | return res; | |
268 | } | |
269 | ||
270 | /* | |
271 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to | |
272 | * create a new state_owner. | |
273 | * | |
274 | */ | |
275 | static struct nfs4_state_owner * | |
276 | nfs4_alloc_state_owner(void) | |
277 | { | |
278 | struct nfs4_state_owner *sp; | |
279 | ||
cee54fc9 | 280 | sp = kzalloc(sizeof(*sp),GFP_KERNEL); |
1da177e4 LT |
281 | if (!sp) |
282 | return NULL; | |
ec073428 | 283 | spin_lock_init(&sp->so_lock); |
1da177e4 LT |
284 | INIT_LIST_HEAD(&sp->so_states); |
285 | INIT_LIST_HEAD(&sp->so_delegations); | |
cee54fc9 TM |
286 | rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue"); |
287 | sp->so_seqid.sequence = &sp->so_sequence; | |
288 | spin_lock_init(&sp->so_sequence.lock); | |
289 | INIT_LIST_HEAD(&sp->so_sequence.list); | |
1da177e4 LT |
290 | atomic_set(&sp->so_count, 1); |
291 | return sp; | |
292 | } | |
293 | ||
294 | void | |
295 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) | |
296 | { | |
adfa6f98 | 297 | struct nfs_client *clp = sp->so_client; |
1da177e4 LT |
298 | spin_lock(&clp->cl_lock); |
299 | list_del_init(&sp->so_list); | |
300 | spin_unlock(&clp->cl_lock); | |
301 | } | |
302 | ||
303 | /* | |
304 | * Note: must be called with clp->cl_sem held in order to prevent races | |
305 | * with reboot recovery! | |
306 | */ | |
307 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred) | |
308 | { | |
7539bbab | 309 | struct nfs_client *clp = server->nfs_client; |
1da177e4 LT |
310 | struct nfs4_state_owner *sp, *new; |
311 | ||
312 | get_rpccred(cred); | |
313 | new = nfs4_alloc_state_owner(); | |
314 | spin_lock(&clp->cl_lock); | |
315 | sp = nfs4_find_state_owner(clp, cred); | |
316 | if (sp == NULL) | |
317 | sp = nfs4_client_grab_unused(clp, cred); | |
318 | if (sp == NULL && new != NULL) { | |
319 | list_add(&new->so_list, &clp->cl_state_owners); | |
320 | new->so_client = clp; | |
321 | new->so_id = nfs4_alloc_lockowner_id(clp); | |
322 | new->so_cred = cred; | |
323 | sp = new; | |
324 | new = NULL; | |
325 | } | |
326 | spin_unlock(&clp->cl_lock); | |
f99d49ad | 327 | kfree(new); |
1da177e4 LT |
328 | if (sp != NULL) |
329 | return sp; | |
330 | put_rpccred(cred); | |
331 | return NULL; | |
332 | } | |
333 | ||
334 | /* | |
335 | * Must be called with clp->cl_sem held in order to avoid races | |
336 | * with state recovery... | |
337 | */ | |
338 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) | |
339 | { | |
adfa6f98 | 340 | struct nfs_client *clp = sp->so_client; |
1da177e4 LT |
341 | struct rpc_cred *cred = sp->so_cred; |
342 | ||
343 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
344 | return; | |
345 | if (clp->cl_nunused >= OPENOWNER_POOL_SIZE) | |
346 | goto out_free; | |
347 | if (list_empty(&sp->so_list)) | |
348 | goto out_free; | |
349 | list_move(&sp->so_list, &clp->cl_unused); | |
350 | clp->cl_nunused++; | |
351 | spin_unlock(&clp->cl_lock); | |
352 | put_rpccred(cred); | |
353 | cred = NULL; | |
354 | return; | |
355 | out_free: | |
356 | list_del(&sp->so_list); | |
357 | spin_unlock(&clp->cl_lock); | |
358 | put_rpccred(cred); | |
359 | kfree(sp); | |
360 | } | |
361 | ||
362 | static struct nfs4_state * | |
363 | nfs4_alloc_open_state(void) | |
364 | { | |
365 | struct nfs4_state *state; | |
366 | ||
e7616923 | 367 | state = kzalloc(sizeof(*state), GFP_KERNEL); |
1da177e4 LT |
368 | if (!state) |
369 | return NULL; | |
1da177e4 LT |
370 | atomic_set(&state->count, 1); |
371 | INIT_LIST_HEAD(&state->lock_states); | |
8d0a8a9d | 372 | spin_lock_init(&state->state_lock); |
1da177e4 LT |
373 | return state; |
374 | } | |
375 | ||
4cecb76f TM |
376 | void |
377 | nfs4_state_set_mode_locked(struct nfs4_state *state, mode_t mode) | |
378 | { | |
379 | if (state->state == mode) | |
380 | return; | |
381 | /* NB! List reordering - see the reclaim code for why. */ | |
382 | if ((mode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { | |
383 | if (mode & FMODE_WRITE) | |
384 | list_move(&state->open_states, &state->owner->so_states); | |
385 | else | |
386 | list_move_tail(&state->open_states, &state->owner->so_states); | |
387 | } | |
388 | if (mode == 0) | |
389 | list_del_init(&state->inode_states); | |
390 | state->state = mode; | |
391 | } | |
392 | ||
1da177e4 LT |
393 | static struct nfs4_state * |
394 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
395 | { | |
396 | struct nfs_inode *nfsi = NFS_I(inode); | |
397 | struct nfs4_state *state; | |
398 | ||
399 | list_for_each_entry(state, &nfsi->open_states, inode_states) { | |
400 | /* Is this in the process of being freed? */ | |
4cecb76f | 401 | if (state->state == 0) |
1da177e4 LT |
402 | continue; |
403 | if (state->owner == owner) { | |
404 | atomic_inc(&state->count); | |
405 | return state; | |
406 | } | |
407 | } | |
408 | return NULL; | |
409 | } | |
410 | ||
1da177e4 LT |
411 | static void |
412 | nfs4_free_open_state(struct nfs4_state *state) | |
413 | { | |
414 | kfree(state); | |
415 | } | |
416 | ||
417 | struct nfs4_state * | |
418 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
419 | { | |
420 | struct nfs4_state *state, *new; | |
421 | struct nfs_inode *nfsi = NFS_I(inode); | |
422 | ||
423 | spin_lock(&inode->i_lock); | |
424 | state = __nfs4_find_state_byowner(inode, owner); | |
425 | spin_unlock(&inode->i_lock); | |
426 | if (state) | |
427 | goto out; | |
428 | new = nfs4_alloc_open_state(); | |
ec073428 | 429 | spin_lock(&owner->so_lock); |
1da177e4 LT |
430 | spin_lock(&inode->i_lock); |
431 | state = __nfs4_find_state_byowner(inode, owner); | |
432 | if (state == NULL && new != NULL) { | |
433 | state = new; | |
1da177e4 LT |
434 | state->owner = owner; |
435 | atomic_inc(&owner->so_count); | |
436 | list_add(&state->inode_states, &nfsi->open_states); | |
437 | state->inode = igrab(inode); | |
438 | spin_unlock(&inode->i_lock); | |
ec073428 TM |
439 | /* Note: The reclaim code dictates that we add stateless |
440 | * and read-only stateids to the end of the list */ | |
441 | list_add_tail(&state->open_states, &owner->so_states); | |
442 | spin_unlock(&owner->so_lock); | |
1da177e4 LT |
443 | } else { |
444 | spin_unlock(&inode->i_lock); | |
ec073428 | 445 | spin_unlock(&owner->so_lock); |
1da177e4 LT |
446 | if (new) |
447 | nfs4_free_open_state(new); | |
448 | } | |
449 | out: | |
450 | return state; | |
451 | } | |
452 | ||
453 | /* | |
454 | * Beware! Caller must be holding exactly one | |
e6dfa553 | 455 | * reference to clp->cl_sem! |
1da177e4 LT |
456 | */ |
457 | void nfs4_put_open_state(struct nfs4_state *state) | |
458 | { | |
459 | struct inode *inode = state->inode; | |
460 | struct nfs4_state_owner *owner = state->owner; | |
461 | ||
ec073428 | 462 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
1da177e4 | 463 | return; |
ec073428 | 464 | spin_lock(&inode->i_lock); |
1da177e4 LT |
465 | if (!list_empty(&state->inode_states)) |
466 | list_del(&state->inode_states); | |
1da177e4 | 467 | list_del(&state->open_states); |
ec073428 TM |
468 | spin_unlock(&inode->i_lock); |
469 | spin_unlock(&owner->so_lock); | |
1da177e4 | 470 | iput(inode); |
1da177e4 LT |
471 | nfs4_free_open_state(state); |
472 | nfs4_put_state_owner(owner); | |
473 | } | |
474 | ||
475 | /* | |
83c9d41e | 476 | * Close the current file. |
1da177e4 LT |
477 | */ |
478 | void nfs4_close_state(struct nfs4_state *state, mode_t mode) | |
479 | { | |
480 | struct inode *inode = state->inode; | |
481 | struct nfs4_state_owner *owner = state->owner; | |
4cecb76f | 482 | int oldstate, newstate = 0; |
1da177e4 LT |
483 | |
484 | atomic_inc(&owner->so_count); | |
1da177e4 | 485 | /* Protect against nfs4_find_state() */ |
ec073428 | 486 | spin_lock(&owner->so_lock); |
1da177e4 | 487 | spin_lock(&inode->i_lock); |
e7616923 TM |
488 | switch (mode & (FMODE_READ | FMODE_WRITE)) { |
489 | case FMODE_READ: | |
490 | state->n_rdonly--; | |
491 | break; | |
492 | case FMODE_WRITE: | |
493 | state->n_wronly--; | |
494 | break; | |
495 | case FMODE_READ|FMODE_WRITE: | |
496 | state->n_rdwr--; | |
497 | } | |
4cecb76f | 498 | oldstate = newstate = state->state; |
e7616923 TM |
499 | if (state->n_rdwr == 0) { |
500 | if (state->n_rdonly == 0) | |
501 | newstate &= ~FMODE_READ; | |
502 | if (state->n_wronly == 0) | |
503 | newstate &= ~FMODE_WRITE; | |
504 | } | |
4cecb76f TM |
505 | if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { |
506 | nfs4_state_set_mode_locked(state, newstate); | |
507 | oldstate = newstate; | |
1da177e4 LT |
508 | } |
509 | spin_unlock(&inode->i_lock); | |
ec073428 | 510 | spin_unlock(&owner->so_lock); |
4cecb76f TM |
511 | |
512 | if (oldstate != newstate && nfs4_do_close(inode, state) == 0) | |
513 | return; | |
1da177e4 | 514 | nfs4_put_open_state(state); |
1da177e4 | 515 | nfs4_put_state_owner(owner); |
1da177e4 LT |
516 | } |
517 | ||
518 | /* | |
519 | * Search the state->lock_states for an existing lock_owner | |
520 | * that is compatible with current->files | |
521 | */ | |
522 | static struct nfs4_lock_state * | |
523 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) | |
524 | { | |
525 | struct nfs4_lock_state *pos; | |
526 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
527 | if (pos->ls_owner != fl_owner) | |
528 | continue; | |
529 | atomic_inc(&pos->ls_count); | |
530 | return pos; | |
531 | } | |
532 | return NULL; | |
533 | } | |
534 | ||
1da177e4 LT |
535 | /* |
536 | * Return a compatible lock_state. If no initialized lock_state structure | |
537 | * exists, return an uninitialized one. | |
538 | * | |
1da177e4 LT |
539 | */ |
540 | static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) | |
541 | { | |
542 | struct nfs4_lock_state *lsp; | |
adfa6f98 | 543 | struct nfs_client *clp = state->owner->so_client; |
1da177e4 | 544 | |
cee54fc9 | 545 | lsp = kzalloc(sizeof(*lsp), GFP_KERNEL); |
1da177e4 LT |
546 | if (lsp == NULL) |
547 | return NULL; | |
cee54fc9 | 548 | lsp->ls_seqid.sequence = &state->owner->so_sequence; |
1da177e4 LT |
549 | atomic_set(&lsp->ls_count, 1); |
550 | lsp->ls_owner = fl_owner; | |
1da177e4 LT |
551 | spin_lock(&clp->cl_lock); |
552 | lsp->ls_id = nfs4_alloc_lockowner_id(clp); | |
553 | spin_unlock(&clp->cl_lock); | |
8d0a8a9d | 554 | INIT_LIST_HEAD(&lsp->ls_locks); |
1da177e4 LT |
555 | return lsp; |
556 | } | |
557 | ||
558 | /* | |
559 | * Return a compatible lock_state. If no initialized lock_state structure | |
560 | * exists, return an uninitialized one. | |
561 | * | |
e6dfa553 | 562 | * The caller must be holding clp->cl_sem |
1da177e4 | 563 | */ |
8d0a8a9d | 564 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner) |
1da177e4 | 565 | { |
8d0a8a9d | 566 | struct nfs4_lock_state *lsp, *new = NULL; |
1da177e4 | 567 | |
8d0a8a9d TM |
568 | for(;;) { |
569 | spin_lock(&state->state_lock); | |
570 | lsp = __nfs4_find_lock_state(state, owner); | |
571 | if (lsp != NULL) | |
572 | break; | |
573 | if (new != NULL) { | |
574 | new->ls_state = state; | |
575 | list_add(&new->ls_locks, &state->lock_states); | |
576 | set_bit(LK_STATE_IN_USE, &state->flags); | |
577 | lsp = new; | |
578 | new = NULL; | |
579 | break; | |
580 | } | |
581 | spin_unlock(&state->state_lock); | |
582 | new = nfs4_alloc_lock_state(state, owner); | |
583 | if (new == NULL) | |
584 | return NULL; | |
585 | } | |
586 | spin_unlock(&state->state_lock); | |
587 | kfree(new); | |
1da177e4 LT |
588 | return lsp; |
589 | } | |
590 | ||
591 | /* | |
8d0a8a9d TM |
592 | * Release reference to lock_state, and free it if we see that |
593 | * it is no longer in use | |
1da177e4 | 594 | */ |
faf5f49c | 595 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
1da177e4 | 596 | { |
8d0a8a9d | 597 | struct nfs4_state *state; |
1da177e4 | 598 | |
8d0a8a9d TM |
599 | if (lsp == NULL) |
600 | return; | |
601 | state = lsp->ls_state; | |
602 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) | |
603 | return; | |
604 | list_del(&lsp->ls_locks); | |
605 | if (list_empty(&state->lock_states)) | |
606 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
607 | spin_unlock(&state->state_lock); | |
608 | kfree(lsp); | |
1da177e4 LT |
609 | } |
610 | ||
8d0a8a9d | 611 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
1da177e4 | 612 | { |
8d0a8a9d | 613 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
1da177e4 | 614 | |
8d0a8a9d TM |
615 | dst->fl_u.nfs4_fl.owner = lsp; |
616 | atomic_inc(&lsp->ls_count); | |
617 | } | |
1da177e4 | 618 | |
8d0a8a9d | 619 | static void nfs4_fl_release_lock(struct file_lock *fl) |
1da177e4 | 620 | { |
8d0a8a9d | 621 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
1da177e4 LT |
622 | } |
623 | ||
8d0a8a9d TM |
624 | static struct file_lock_operations nfs4_fl_lock_ops = { |
625 | .fl_copy_lock = nfs4_fl_copy_lock, | |
626 | .fl_release_private = nfs4_fl_release_lock, | |
627 | }; | |
628 | ||
629 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
1da177e4 | 630 | { |
8d0a8a9d TM |
631 | struct nfs4_lock_state *lsp; |
632 | ||
633 | if (fl->fl_ops != NULL) | |
634 | return 0; | |
635 | lsp = nfs4_get_lock_state(state, fl->fl_owner); | |
636 | if (lsp == NULL) | |
637 | return -ENOMEM; | |
638 | fl->fl_u.nfs4_fl.owner = lsp; | |
639 | fl->fl_ops = &nfs4_fl_lock_ops; | |
640 | return 0; | |
1da177e4 LT |
641 | } |
642 | ||
8d0a8a9d TM |
643 | /* |
644 | * Byte-range lock aware utility to initialize the stateid of read/write | |
645 | * requests. | |
1da177e4 | 646 | */ |
8d0a8a9d | 647 | void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner) |
1da177e4 | 648 | { |
8d0a8a9d | 649 | struct nfs4_lock_state *lsp; |
1da177e4 | 650 | |
8d0a8a9d TM |
651 | memcpy(dst, &state->stateid, sizeof(*dst)); |
652 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) | |
653 | return; | |
1da177e4 | 654 | |
8d0a8a9d TM |
655 | spin_lock(&state->state_lock); |
656 | lsp = __nfs4_find_lock_state(state, fl_owner); | |
657 | if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) | |
658 | memcpy(dst, &lsp->ls_stateid, sizeof(*dst)); | |
659 | spin_unlock(&state->state_lock); | |
1da177e4 LT |
660 | nfs4_put_lock_state(lsp); |
661 | } | |
662 | ||
cee54fc9 TM |
663 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter) |
664 | { | |
36f20c6d | 665 | struct rpc_sequence *sequence = counter->sequence; |
cee54fc9 TM |
666 | struct nfs_seqid *new; |
667 | ||
668 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
669 | if (new != NULL) { | |
670 | new->sequence = counter; | |
36f20c6d TM |
671 | spin_lock(&sequence->lock); |
672 | list_add_tail(&new->list, &sequence->list); | |
673 | spin_unlock(&sequence->lock); | |
cee54fc9 TM |
674 | } |
675 | return new; | |
676 | } | |
677 | ||
678 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
1da177e4 | 679 | { |
cee54fc9 | 680 | struct rpc_sequence *sequence = seqid->sequence->sequence; |
cee54fc9 | 681 | |
36f20c6d TM |
682 | spin_lock(&sequence->lock); |
683 | list_del(&seqid->list); | |
684 | spin_unlock(&sequence->lock); | |
685 | rpc_wake_up(&sequence->wait); | |
cee54fc9 | 686 | kfree(seqid); |
1da177e4 LT |
687 | } |
688 | ||
689 | /* | |
cee54fc9 TM |
690 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
691 | * failed with a seqid incrementing error - | |
692 | * see comments nfs_fs.h:seqid_mutating_error() | |
693 | */ | |
694 | static inline void nfs_increment_seqid(int status, struct nfs_seqid *seqid) | |
695 | { | |
696 | switch (status) { | |
697 | case 0: | |
698 | break; | |
699 | case -NFS4ERR_BAD_SEQID: | |
700 | case -NFS4ERR_STALE_CLIENTID: | |
701 | case -NFS4ERR_STALE_STATEID: | |
702 | case -NFS4ERR_BAD_STATEID: | |
703 | case -NFS4ERR_BADXDR: | |
704 | case -NFS4ERR_RESOURCE: | |
705 | case -NFS4ERR_NOFILEHANDLE: | |
706 | /* Non-seqid mutating errors */ | |
707 | return; | |
708 | }; | |
709 | /* | |
710 | * Note: no locking needed as we are guaranteed to be first | |
711 | * on the sequence list | |
712 | */ | |
713 | seqid->sequence->counter++; | |
714 | } | |
715 | ||
716 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
717 | { | |
718 | if (status == -NFS4ERR_BAD_SEQID) { | |
719 | struct nfs4_state_owner *sp = container_of(seqid->sequence, | |
720 | struct nfs4_state_owner, so_seqid); | |
1da177e4 | 721 | nfs4_drop_state_owner(sp); |
cee54fc9 TM |
722 | } |
723 | return nfs_increment_seqid(status, seqid); | |
724 | } | |
725 | ||
726 | /* | |
cee54fc9 TM |
727 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
728 | * failed with a seqid incrementing error - | |
729 | * see comments nfs_fs.h:seqid_mutating_error() | |
730 | */ | |
731 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
732 | { | |
733 | return nfs_increment_seqid(status, seqid); | |
734 | } | |
735 | ||
736 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
737 | { | |
738 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
739 | int status = 0; | |
740 | ||
4e51336a TM |
741 | if (sequence->list.next == &seqid->list) |
742 | goto out; | |
cee54fc9 | 743 | spin_lock(&sequence->lock); |
36f20c6d | 744 | if (sequence->list.next != &seqid->list) { |
cee54fc9 TM |
745 | rpc_sleep_on(&sequence->wait, task, NULL, NULL); |
746 | status = -EAGAIN; | |
36f20c6d | 747 | } |
cee54fc9 | 748 | spin_unlock(&sequence->lock); |
4e51336a | 749 | out: |
cee54fc9 | 750 | return status; |
1da177e4 LT |
751 | } |
752 | ||
753 | static int reclaimer(void *); | |
1da177e4 | 754 | |
adfa6f98 | 755 | static inline void nfs4_clear_recover_bit(struct nfs_client *clp) |
433fbe4c TM |
756 | { |
757 | smp_mb__before_clear_bit(); | |
758 | clear_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state); | |
759 | smp_mb__after_clear_bit(); | |
760 | wake_up_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER); | |
761 | rpc_wake_up(&clp->cl_rpcwaitq); | |
762 | } | |
763 | ||
1da177e4 LT |
764 | /* |
765 | * State recovery routine | |
766 | */ | |
adfa6f98 | 767 | static void nfs4_recover_state(struct nfs_client *clp) |
1da177e4 | 768 | { |
5043e900 | 769 | struct task_struct *task; |
1da177e4 | 770 | |
5043e900 TM |
771 | __module_get(THIS_MODULE); |
772 | atomic_inc(&clp->cl_count); | |
773 | task = kthread_run(reclaimer, clp, "%u.%u.%u.%u-reclaim", | |
774 | NIPQUAD(clp->cl_addr)); | |
775 | if (!IS_ERR(task)) | |
776 | return; | |
433fbe4c | 777 | nfs4_clear_recover_bit(clp); |
5043e900 TM |
778 | nfs4_put_client(clp); |
779 | module_put(THIS_MODULE); | |
1da177e4 LT |
780 | } |
781 | ||
782 | /* | |
783 | * Schedule a state recovery attempt | |
784 | */ | |
adfa6f98 | 785 | void nfs4_schedule_state_recovery(struct nfs_client *clp) |
1da177e4 LT |
786 | { |
787 | if (!clp) | |
788 | return; | |
433fbe4c | 789 | if (test_and_set_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0) |
5043e900 | 790 | nfs4_recover_state(clp); |
1da177e4 LT |
791 | } |
792 | ||
793 | static int nfs4_reclaim_locks(struct nfs4_state_recovery_ops *ops, struct nfs4_state *state) | |
794 | { | |
795 | struct inode *inode = state->inode; | |
796 | struct file_lock *fl; | |
797 | int status = 0; | |
798 | ||
799 | for (fl = inode->i_flock; fl != 0; fl = fl->fl_next) { | |
43b2a33a | 800 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
1da177e4 LT |
801 | continue; |
802 | if (((struct nfs_open_context *)fl->fl_file->private_data)->state != state) | |
803 | continue; | |
804 | status = ops->recover_lock(state, fl); | |
805 | if (status >= 0) | |
806 | continue; | |
807 | switch (status) { | |
808 | default: | |
809 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
810 | __FUNCTION__, status); | |
811 | case -NFS4ERR_EXPIRED: | |
812 | case -NFS4ERR_NO_GRACE: | |
813 | case -NFS4ERR_RECLAIM_BAD: | |
814 | case -NFS4ERR_RECLAIM_CONFLICT: | |
43b2a33a | 815 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
1da177e4 LT |
816 | break; |
817 | case -NFS4ERR_STALE_CLIENTID: | |
818 | goto out_err; | |
819 | } | |
820 | } | |
821 | return 0; | |
822 | out_err: | |
823 | return status; | |
824 | } | |
825 | ||
826 | static int nfs4_reclaim_open_state(struct nfs4_state_recovery_ops *ops, struct nfs4_state_owner *sp) | |
827 | { | |
828 | struct nfs4_state *state; | |
829 | struct nfs4_lock_state *lock; | |
830 | int status = 0; | |
831 | ||
832 | /* Note: we rely on the sp->so_states list being ordered | |
833 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
834 | * states first. | |
835 | * This is needed to ensure that the server won't give us any | |
836 | * read delegations that we have to return if, say, we are | |
837 | * recovering after a network partition or a reboot from a | |
838 | * server that doesn't support a grace period. | |
839 | */ | |
840 | list_for_each_entry(state, &sp->so_states, open_states) { | |
841 | if (state->state == 0) | |
842 | continue; | |
843 | status = ops->recover_open(sp, state); | |
1da177e4 LT |
844 | if (status >= 0) { |
845 | status = nfs4_reclaim_locks(ops, state); | |
846 | if (status < 0) | |
847 | goto out_err; | |
848 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
849 | if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) | |
850 | printk("%s: Lock reclaim failed!\n", | |
851 | __FUNCTION__); | |
852 | } | |
853 | continue; | |
854 | } | |
855 | switch (status) { | |
856 | default: | |
857 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
858 | __FUNCTION__, status); | |
859 | case -ENOENT: | |
860 | case -NFS4ERR_RECLAIM_BAD: | |
861 | case -NFS4ERR_RECLAIM_CONFLICT: | |
862 | /* | |
863 | * Open state on this file cannot be recovered | |
864 | * All we can do is revert to using the zero stateid. | |
865 | */ | |
866 | memset(state->stateid.data, 0, | |
867 | sizeof(state->stateid.data)); | |
868 | /* Mark the file as being 'closed' */ | |
869 | state->state = 0; | |
870 | break; | |
871 | case -NFS4ERR_EXPIRED: | |
872 | case -NFS4ERR_NO_GRACE: | |
873 | case -NFS4ERR_STALE_CLIENTID: | |
874 | goto out_err; | |
875 | } | |
876 | } | |
877 | return 0; | |
878 | out_err: | |
879 | return status; | |
880 | } | |
881 | ||
adfa6f98 | 882 | static void nfs4_state_mark_reclaim(struct nfs_client *clp) |
cee54fc9 TM |
883 | { |
884 | struct nfs4_state_owner *sp; | |
885 | struct nfs4_state *state; | |
886 | struct nfs4_lock_state *lock; | |
887 | ||
888 | /* Reset all sequence ids to zero */ | |
889 | list_for_each_entry(sp, &clp->cl_state_owners, so_list) { | |
890 | sp->so_seqid.counter = 0; | |
891 | sp->so_seqid.flags = 0; | |
ec073428 | 892 | spin_lock(&sp->so_lock); |
cee54fc9 TM |
893 | list_for_each_entry(state, &sp->so_states, open_states) { |
894 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
895 | lock->ls_seqid.counter = 0; | |
896 | lock->ls_seqid.flags = 0; | |
897 | lock->ls_flags &= ~NFS_LOCK_INITIALIZED; | |
898 | } | |
899 | } | |
ec073428 | 900 | spin_unlock(&sp->so_lock); |
cee54fc9 TM |
901 | } |
902 | } | |
903 | ||
1da177e4 LT |
904 | static int reclaimer(void *ptr) |
905 | { | |
adfa6f98 | 906 | struct nfs_client *clp = ptr; |
1da177e4 LT |
907 | struct nfs4_state_owner *sp; |
908 | struct nfs4_state_recovery_ops *ops; | |
286d7d6a | 909 | struct rpc_cred *cred; |
1da177e4 LT |
910 | int status = 0; |
911 | ||
1da177e4 LT |
912 | allow_signal(SIGKILL); |
913 | ||
1da177e4 LT |
914 | /* Ensure exclusive access to NFSv4 state */ |
915 | lock_kernel(); | |
916 | down_write(&clp->cl_sem); | |
917 | /* Are there any NFS mounts out there? */ | |
918 | if (list_empty(&clp->cl_superblocks)) | |
919 | goto out; | |
920 | restart_loop: | |
286d7d6a TM |
921 | ops = &nfs4_network_partition_recovery_ops; |
922 | /* Are there any open files on this volume? */ | |
923 | cred = nfs4_get_renew_cred(clp); | |
924 | if (cred != NULL) { | |
925 | /* Yes there are: try to renew the old lease */ | |
926 | status = nfs4_proc_renew(clp, cred); | |
927 | switch (status) { | |
928 | case 0: | |
929 | case -NFS4ERR_CB_PATH_DOWN: | |
930 | put_rpccred(cred); | |
931 | goto out; | |
932 | case -NFS4ERR_STALE_CLIENTID: | |
933 | case -NFS4ERR_LEASE_MOVED: | |
934 | ops = &nfs4_reboot_recovery_ops; | |
935 | } | |
936 | } else { | |
937 | /* "reboot" to ensure we clear all state on the server */ | |
938 | clp->cl_boot_time = CURRENT_TIME; | |
939 | cred = nfs4_get_setclientid_cred(clp); | |
940 | } | |
941 | /* We're going to have to re-establish a clientid */ | |
cee54fc9 | 942 | nfs4_state_mark_reclaim(clp); |
286d7d6a TM |
943 | status = -ENOENT; |
944 | if (cred != NULL) { | |
945 | status = nfs4_init_client(clp, cred); | |
946 | put_rpccred(cred); | |
947 | } | |
1da177e4 LT |
948 | if (status) |
949 | goto out_error; | |
950 | /* Mark all delegations for reclaim */ | |
951 | nfs_delegation_mark_reclaim(clp); | |
952 | /* Note: list is protected by exclusive lock on cl->cl_sem */ | |
953 | list_for_each_entry(sp, &clp->cl_state_owners, so_list) { | |
954 | status = nfs4_reclaim_open_state(ops, sp); | |
955 | if (status < 0) { | |
956 | if (status == -NFS4ERR_NO_GRACE) { | |
957 | ops = &nfs4_network_partition_recovery_ops; | |
958 | status = nfs4_reclaim_open_state(ops, sp); | |
959 | } | |
960 | if (status == -NFS4ERR_STALE_CLIENTID) | |
961 | goto restart_loop; | |
962 | if (status == -NFS4ERR_EXPIRED) | |
963 | goto restart_loop; | |
964 | } | |
965 | } | |
966 | nfs_delegation_reap_unclaimed(clp); | |
967 | out: | |
1da177e4 LT |
968 | up_write(&clp->cl_sem); |
969 | unlock_kernel(); | |
1da177e4 LT |
970 | if (status == -NFS4ERR_CB_PATH_DOWN) |
971 | nfs_handle_cb_pathdown(clp); | |
433fbe4c | 972 | nfs4_clear_recover_bit(clp); |
1da177e4 | 973 | nfs4_put_client(clp); |
5043e900 | 974 | module_put_and_exit(0); |
1da177e4 LT |
975 | return 0; |
976 | out_error: | |
977 | printk(KERN_WARNING "Error: state recovery failed on NFSv4 server %u.%u.%u.%u with error %d\n", | |
978 | NIPQUAD(clp->cl_addr.s_addr), -status); | |
51581f3b | 979 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
1da177e4 LT |
980 | goto out; |
981 | } | |
982 | ||
983 | /* | |
984 | * Local variables: | |
985 | * c-basic-offset: 8 | |
986 | * End: | |
987 | */ |