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1 | /* AFS file locking support |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/smp_lock.h> | |
13 | #include "internal.h" | |
14 | ||
15 | #define AFS_LOCK_GRANTED 0 | |
16 | #define AFS_LOCK_PENDING 1 | |
17 | ||
18 | static void afs_fl_copy_lock(struct file_lock *new, struct file_lock *fl); | |
19 | static void afs_fl_release_private(struct file_lock *fl); | |
20 | ||
21 | static struct workqueue_struct *afs_lock_manager; | |
22 | ||
23 | static struct file_lock_operations afs_lock_ops = { | |
24 | .fl_copy_lock = afs_fl_copy_lock, | |
25 | .fl_release_private = afs_fl_release_private, | |
26 | }; | |
27 | ||
28 | /* | |
29 | * initialise the lock manager thread if it isn't already running | |
30 | */ | |
31 | static int afs_init_lock_manager(void) | |
32 | { | |
33 | if (!afs_lock_manager) { | |
34 | afs_lock_manager = create_singlethread_workqueue("kafs_lockd"); | |
35 | if (!afs_lock_manager) | |
36 | return -ENOMEM; | |
37 | } | |
38 | return 0; | |
39 | } | |
40 | ||
41 | /* | |
42 | * destroy the lock manager thread if it's running | |
43 | */ | |
44 | void __exit afs_kill_lock_manager(void) | |
45 | { | |
46 | if (afs_lock_manager) | |
47 | destroy_workqueue(afs_lock_manager); | |
48 | } | |
49 | ||
50 | /* | |
51 | * if the callback is broken on this vnode, then the lock may now be available | |
52 | */ | |
53 | void afs_lock_may_be_available(struct afs_vnode *vnode) | |
54 | { | |
55 | _enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode); | |
56 | ||
57 | queue_delayed_work(afs_lock_manager, &vnode->lock_work, 0); | |
58 | } | |
59 | ||
60 | /* | |
61 | * the lock will time out in 5 minutes unless we extend it, so schedule | |
62 | * extension in a bit less than that time | |
63 | */ | |
64 | static void afs_schedule_lock_extension(struct afs_vnode *vnode) | |
65 | { | |
66 | queue_delayed_work(afs_lock_manager, &vnode->lock_work, | |
67 | AFS_LOCKWAIT * HZ / 2); | |
68 | } | |
69 | ||
70 | /* | |
71 | * do work for a lock, including: | |
72 | * - probing for a lock we're waiting on but didn't get immediately | |
73 | * - extending a lock that's close to timing out | |
74 | */ | |
75 | void afs_lock_work(struct work_struct *work) | |
76 | { | |
77 | struct afs_vnode *vnode = | |
78 | container_of(work, struct afs_vnode, lock_work.work); | |
79 | struct file_lock *fl; | |
80 | afs_lock_type_t type; | |
81 | struct key *key; | |
82 | int ret; | |
83 | ||
84 | _enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode); | |
85 | ||
86 | spin_lock(&vnode->lock); | |
87 | ||
88 | if (test_bit(AFS_VNODE_UNLOCKING, &vnode->flags)) { | |
89 | _debug("unlock"); | |
90 | spin_unlock(&vnode->lock); | |
91 | ||
92 | /* attempt to release the server lock; if it fails, we just | |
93 | * wait 5 minutes and it'll time out anyway */ | |
94 | ret = afs_vnode_release_lock(vnode, vnode->unlock_key); | |
95 | if (ret < 0) | |
96 | printk(KERN_WARNING "AFS:" | |
97 | " Failed to release lock on {%x:%x} error %d\n", | |
98 | vnode->fid.vid, vnode->fid.vnode, ret); | |
99 | ||
100 | spin_lock(&vnode->lock); | |
101 | key_put(vnode->unlock_key); | |
102 | vnode->unlock_key = NULL; | |
103 | clear_bit(AFS_VNODE_UNLOCKING, &vnode->flags); | |
104 | } | |
105 | ||
106 | /* if we've got a lock, then it must be time to extend that lock as AFS | |
107 | * locks time out after 5 minutes */ | |
108 | if (!list_empty(&vnode->granted_locks)) { | |
109 | _debug("extend"); | |
110 | ||
111 | if (test_and_set_bit(AFS_VNODE_LOCKING, &vnode->flags)) | |
112 | BUG(); | |
113 | fl = list_entry(vnode->granted_locks.next, | |
114 | struct file_lock, fl_u.afs.link); | |
115 | key = key_get(fl->fl_file->private_data); | |
116 | spin_unlock(&vnode->lock); | |
117 | ||
118 | ret = afs_vnode_extend_lock(vnode, key); | |
119 | clear_bit(AFS_VNODE_LOCKING, &vnode->flags); | |
120 | key_put(key); | |
121 | switch (ret) { | |
122 | case 0: | |
123 | afs_schedule_lock_extension(vnode); | |
124 | break; | |
125 | default: | |
126 | /* ummm... we failed to extend the lock - retry | |
127 | * extension shortly */ | |
128 | printk(KERN_WARNING "AFS:" | |
129 | " Failed to extend lock on {%x:%x} error %d\n", | |
130 | vnode->fid.vid, vnode->fid.vnode, ret); | |
131 | queue_delayed_work(afs_lock_manager, &vnode->lock_work, | |
132 | HZ * 10); | |
133 | break; | |
134 | } | |
135 | _leave(" [extend]"); | |
136 | return; | |
137 | } | |
138 | ||
139 | /* if we don't have a granted lock, then we must've been called back by | |
140 | * the server, and so if might be possible to get a lock we're | |
141 | * currently waiting for */ | |
142 | if (!list_empty(&vnode->pending_locks)) { | |
143 | _debug("get"); | |
144 | ||
145 | if (test_and_set_bit(AFS_VNODE_LOCKING, &vnode->flags)) | |
146 | BUG(); | |
147 | fl = list_entry(vnode->pending_locks.next, | |
148 | struct file_lock, fl_u.afs.link); | |
149 | key = key_get(fl->fl_file->private_data); | |
150 | type = (fl->fl_type == F_RDLCK) ? | |
151 | AFS_LOCK_READ : AFS_LOCK_WRITE; | |
152 | spin_unlock(&vnode->lock); | |
153 | ||
154 | ret = afs_vnode_set_lock(vnode, key, type); | |
155 | clear_bit(AFS_VNODE_LOCKING, &vnode->flags); | |
156 | switch (ret) { | |
157 | case -EWOULDBLOCK: | |
158 | _debug("blocked"); | |
159 | break; | |
160 | case 0: | |
161 | _debug("acquired"); | |
162 | if (type == AFS_LOCK_READ) | |
163 | set_bit(AFS_VNODE_READLOCKED, &vnode->flags); | |
164 | else | |
165 | set_bit(AFS_VNODE_WRITELOCKED, &vnode->flags); | |
166 | ret = AFS_LOCK_GRANTED; | |
167 | default: | |
168 | spin_lock(&vnode->lock); | |
169 | /* the pending lock may have been withdrawn due to a | |
170 | * signal */ | |
171 | if (list_entry(vnode->pending_locks.next, | |
172 | struct file_lock, fl_u.afs.link) == fl) { | |
173 | fl->fl_u.afs.state = ret; | |
174 | if (ret == AFS_LOCK_GRANTED) | |
175 | list_move_tail(&fl->fl_u.afs.link, | |
176 | &vnode->granted_locks); | |
177 | else | |
178 | list_del_init(&fl->fl_u.afs.link); | |
179 | wake_up(&fl->fl_wait); | |
180 | spin_unlock(&vnode->lock); | |
181 | } else { | |
182 | _debug("withdrawn"); | |
183 | clear_bit(AFS_VNODE_READLOCKED, &vnode->flags); | |
184 | clear_bit(AFS_VNODE_WRITELOCKED, &vnode->flags); | |
185 | spin_unlock(&vnode->lock); | |
186 | afs_vnode_release_lock(vnode, key); | |
187 | if (!list_empty(&vnode->pending_locks)) | |
188 | afs_lock_may_be_available(vnode); | |
189 | } | |
190 | break; | |
191 | } | |
192 | key_put(key); | |
193 | _leave(" [pend]"); | |
194 | return; | |
195 | } | |
196 | ||
197 | /* looks like the lock request was withdrawn on a signal */ | |
198 | spin_unlock(&vnode->lock); | |
199 | _leave(" [no locks]"); | |
200 | } | |
201 | ||
202 | /* | |
203 | * pass responsibility for the unlocking of a vnode on the server to the | |
204 | * manager thread, lest a pending signal in the calling thread interrupt | |
205 | * AF_RXRPC | |
206 | * - the caller must hold the vnode lock | |
207 | */ | |
208 | static void afs_defer_unlock(struct afs_vnode *vnode, struct key *key) | |
209 | { | |
210 | cancel_delayed_work(&vnode->lock_work); | |
211 | if (!test_and_clear_bit(AFS_VNODE_READLOCKED, &vnode->flags) && | |
212 | !test_and_clear_bit(AFS_VNODE_WRITELOCKED, &vnode->flags)) | |
213 | BUG(); | |
214 | if (test_and_set_bit(AFS_VNODE_UNLOCKING, &vnode->flags)) | |
215 | BUG(); | |
216 | vnode->unlock_key = key_get(key); | |
217 | afs_lock_may_be_available(vnode); | |
218 | } | |
219 | ||
220 | /* | |
221 | * request a lock on a file on the server | |
222 | */ | |
223 | static int afs_do_setlk(struct file *file, struct file_lock *fl) | |
224 | { | |
225 | struct afs_vnode *vnode = AFS_FS_I(file->f_mapping->host); | |
226 | afs_lock_type_t type; | |
227 | struct key *key = file->private_data; | |
228 | int ret; | |
229 | ||
230 | _enter("{%x:%u},%u", vnode->fid.vid, vnode->fid.vnode, fl->fl_type); | |
231 | ||
232 | /* only whole-file locks are supported */ | |
233 | if (fl->fl_start != 0 || fl->fl_end != OFFSET_MAX) | |
234 | return -EINVAL; | |
235 | ||
236 | ret = afs_init_lock_manager(); | |
237 | if (ret < 0) | |
238 | return ret; | |
239 | ||
240 | fl->fl_ops = &afs_lock_ops; | |
241 | INIT_LIST_HEAD(&fl->fl_u.afs.link); | |
242 | fl->fl_u.afs.state = AFS_LOCK_PENDING; | |
243 | ||
244 | type = (fl->fl_type == F_RDLCK) ? AFS_LOCK_READ : AFS_LOCK_WRITE; | |
245 | ||
246 | lock_kernel(); | |
247 | ||
248 | /* make sure we've got a callback on this file and that our view of the | |
249 | * data version is up to date */ | |
250 | ret = afs_vnode_fetch_status(vnode, NULL, key); | |
251 | if (ret < 0) | |
252 | goto error; | |
253 | ||
254 | if (vnode->status.lock_count != 0 && !(fl->fl_flags & FL_SLEEP)) { | |
255 | ret = -EAGAIN; | |
256 | goto error; | |
257 | } | |
258 | ||
259 | spin_lock(&vnode->lock); | |
260 | ||
261 | if (list_empty(&vnode->pending_locks)) { | |
262 | /* if there's no-one else with a lock on this vnode, then we | |
263 | * need to ask the server for a lock */ | |
264 | if (list_empty(&vnode->granted_locks)) { | |
265 | _debug("not locked"); | |
266 | ASSERTCMP(vnode->flags & | |
267 | ((1 << AFS_VNODE_LOCKING) | | |
268 | (1 << AFS_VNODE_READLOCKED) | | |
269 | (1 << AFS_VNODE_WRITELOCKED)), ==, 0); | |
270 | list_add_tail(&fl->fl_u.afs.link, &vnode->pending_locks); | |
271 | set_bit(AFS_VNODE_LOCKING, &vnode->flags); | |
272 | spin_unlock(&vnode->lock); | |
273 | ||
274 | ret = afs_vnode_set_lock(vnode, key, type); | |
275 | clear_bit(AFS_VNODE_LOCKING, &vnode->flags); | |
276 | switch (ret) { | |
277 | case 0: | |
278 | goto acquired_server_lock; | |
279 | case -EWOULDBLOCK: | |
280 | spin_lock(&vnode->lock); | |
281 | ASSERT(list_empty(&vnode->granted_locks)); | |
282 | ASSERTCMP(vnode->pending_locks.next, ==, | |
283 | &fl->fl_u.afs.link); | |
284 | goto wait; | |
285 | default: | |
286 | spin_lock(&vnode->lock); | |
287 | list_del_init(&fl->fl_u.afs.link); | |
288 | spin_unlock(&vnode->lock); | |
289 | goto error; | |
290 | } | |
291 | } | |
292 | ||
293 | /* if we've already got a readlock on the server and no waiting | |
294 | * writelocks, then we might be able to instantly grant another | |
295 | * readlock */ | |
296 | if (type == AFS_LOCK_READ && | |
297 | vnode->flags & (1 << AFS_VNODE_READLOCKED)) { | |
298 | _debug("instant readlock"); | |
299 | ASSERTCMP(vnode->flags & | |
300 | ((1 << AFS_VNODE_LOCKING) | | |
301 | (1 << AFS_VNODE_WRITELOCKED)), ==, 0); | |
302 | ASSERT(!list_empty(&vnode->granted_locks)); | |
303 | goto sharing_existing_lock; | |
304 | } | |
305 | } | |
306 | ||
307 | /* otherwise, we need to wait for a local lock to become available */ | |
308 | _debug("wait local"); | |
309 | list_add_tail(&fl->fl_u.afs.link, &vnode->pending_locks); | |
310 | wait: | |
311 | if (!(fl->fl_flags & FL_SLEEP)) { | |
312 | _debug("noblock"); | |
313 | ret = -EAGAIN; | |
314 | goto abort_attempt; | |
315 | } | |
316 | spin_unlock(&vnode->lock); | |
317 | ||
318 | /* now we need to sleep and wait for the lock manager thread to get the | |
319 | * lock from the server */ | |
320 | _debug("sleep"); | |
321 | ret = wait_event_interruptible(fl->fl_wait, | |
322 | fl->fl_u.afs.state <= AFS_LOCK_GRANTED); | |
323 | if (fl->fl_u.afs.state <= AFS_LOCK_GRANTED) { | |
324 | ret = fl->fl_u.afs.state; | |
325 | if (ret < 0) | |
326 | goto error; | |
327 | spin_lock(&vnode->lock); | |
328 | goto given_lock; | |
329 | } | |
330 | ||
331 | /* we were interrupted, but someone may still be in the throes of | |
332 | * giving us the lock */ | |
333 | _debug("intr"); | |
334 | ASSERTCMP(ret, ==, -ERESTARTSYS); | |
335 | ||
336 | spin_lock(&vnode->lock); | |
337 | if (fl->fl_u.afs.state <= AFS_LOCK_GRANTED) { | |
338 | ret = fl->fl_u.afs.state; | |
339 | if (ret < 0) { | |
340 | spin_unlock(&vnode->lock); | |
341 | goto error; | |
342 | } | |
343 | goto given_lock; | |
344 | } | |
345 | ||
346 | abort_attempt: | |
347 | /* we aren't going to get the lock, either because we're unwilling to | |
348 | * wait, or because some signal happened */ | |
349 | _debug("abort"); | |
350 | if (list_empty(&vnode->granted_locks) && | |
351 | vnode->pending_locks.next == &fl->fl_u.afs.link) { | |
352 | if (vnode->pending_locks.prev != &fl->fl_u.afs.link) { | |
353 | /* kick the next pending lock into having a go */ | |
354 | list_del_init(&fl->fl_u.afs.link); | |
355 | afs_lock_may_be_available(vnode); | |
356 | } | |
357 | } else { | |
358 | list_del_init(&fl->fl_u.afs.link); | |
359 | } | |
360 | spin_unlock(&vnode->lock); | |
361 | goto error; | |
362 | ||
363 | acquired_server_lock: | |
364 | /* we've acquired a server lock, but it needs to be renewed after 5 | |
365 | * mins */ | |
366 | spin_lock(&vnode->lock); | |
367 | afs_schedule_lock_extension(vnode); | |
368 | if (type == AFS_LOCK_READ) | |
369 | set_bit(AFS_VNODE_READLOCKED, &vnode->flags); | |
370 | else | |
371 | set_bit(AFS_VNODE_WRITELOCKED, &vnode->flags); | |
372 | sharing_existing_lock: | |
373 | /* the lock has been granted as far as we're concerned... */ | |
374 | fl->fl_u.afs.state = AFS_LOCK_GRANTED; | |
375 | list_move_tail(&fl->fl_u.afs.link, &vnode->granted_locks); | |
376 | given_lock: | |
377 | /* ... but we do still need to get the VFS's blessing */ | |
378 | ASSERT(!(vnode->flags & (1 << AFS_VNODE_LOCKING))); | |
379 | ASSERT((vnode->flags & ((1 << AFS_VNODE_READLOCKED) | | |
380 | (1 << AFS_VNODE_WRITELOCKED))) != 0); | |
381 | ret = posix_lock_file(file, fl, NULL); | |
382 | if (ret < 0) | |
383 | goto vfs_rejected_lock; | |
384 | spin_unlock(&vnode->lock); | |
385 | ||
386 | /* again, make sure we've got a callback on this file and, again, make | |
387 | * sure that our view of the data version is up to date (we ignore | |
388 | * errors incurred here and deal with the consequences elsewhere) */ | |
389 | afs_vnode_fetch_status(vnode, NULL, key); | |
390 | ||
391 | error: | |
392 | unlock_kernel(); | |
393 | _leave(" = %d", ret); | |
394 | return ret; | |
395 | ||
396 | vfs_rejected_lock: | |
397 | /* the VFS rejected the lock we just obtained, so we have to discard | |
398 | * what we just got */ | |
399 | _debug("vfs refused %d", ret); | |
400 | list_del_init(&fl->fl_u.afs.link); | |
401 | if (list_empty(&vnode->granted_locks)) | |
402 | afs_defer_unlock(vnode, key); | |
403 | spin_unlock(&vnode->lock); | |
404 | goto abort_attempt; | |
405 | } | |
406 | ||
407 | /* | |
408 | * unlock on a file on the server | |
409 | */ | |
410 | static int afs_do_unlk(struct file *file, struct file_lock *fl) | |
411 | { | |
412 | struct afs_vnode *vnode = AFS_FS_I(file->f_mapping->host); | |
413 | struct key *key = file->private_data; | |
414 | int ret; | |
415 | ||
416 | _enter("{%x:%u},%u", vnode->fid.vid, vnode->fid.vnode, fl->fl_type); | |
417 | ||
418 | /* only whole-file unlocks are supported */ | |
419 | if (fl->fl_start != 0 || fl->fl_end != OFFSET_MAX) | |
420 | return -EINVAL; | |
421 | ||
422 | fl->fl_ops = &afs_lock_ops; | |
423 | INIT_LIST_HEAD(&fl->fl_u.afs.link); | |
424 | fl->fl_u.afs.state = AFS_LOCK_PENDING; | |
425 | ||
426 | spin_lock(&vnode->lock); | |
427 | ret = posix_lock_file(file, fl, NULL); | |
428 | if (ret < 0) { | |
429 | spin_unlock(&vnode->lock); | |
430 | _leave(" = %d [vfs]", ret); | |
431 | return ret; | |
432 | } | |
433 | ||
434 | /* discard the server lock only if all granted locks are gone */ | |
435 | if (list_empty(&vnode->granted_locks)) | |
436 | afs_defer_unlock(vnode, key); | |
437 | spin_unlock(&vnode->lock); | |
438 | _leave(" = 0"); | |
439 | return 0; | |
440 | } | |
441 | ||
442 | /* | |
443 | * return information about a lock we currently hold, if indeed we hold one | |
444 | */ | |
445 | static int afs_do_getlk(struct file *file, struct file_lock *fl) | |
446 | { | |
447 | struct afs_vnode *vnode = AFS_FS_I(file->f_mapping->host); | |
448 | struct key *key = file->private_data; | |
449 | int ret, lock_count; | |
450 | ||
451 | _enter(""); | |
452 | ||
453 | fl->fl_type = F_UNLCK; | |
454 | ||
455 | mutex_lock(&vnode->vfs_inode.i_mutex); | |
456 | ||
457 | /* check local lock records first */ | |
458 | ret = 0; | |
459 | if (posix_test_lock(file, fl) == 0) { | |
460 | /* no local locks; consult the server */ | |
461 | ret = afs_vnode_fetch_status(vnode, NULL, key); | |
462 | if (ret < 0) | |
463 | goto error; | |
464 | lock_count = vnode->status.lock_count; | |
465 | if (lock_count) { | |
466 | if (lock_count > 0) | |
467 | fl->fl_type = F_RDLCK; | |
468 | else | |
469 | fl->fl_type = F_WRLCK; | |
470 | fl->fl_start = 0; | |
471 | fl->fl_end = OFFSET_MAX; | |
472 | } | |
473 | } | |
474 | ||
475 | error: | |
476 | mutex_unlock(&vnode->vfs_inode.i_mutex); | |
477 | _leave(" = %d [%hd]", ret, fl->fl_type); | |
478 | return ret; | |
479 | } | |
480 | ||
481 | /* | |
482 | * manage POSIX locks on a file | |
483 | */ | |
484 | int afs_lock(struct file *file, int cmd, struct file_lock *fl) | |
485 | { | |
486 | struct afs_vnode *vnode = AFS_FS_I(file->f_dentry->d_inode); | |
487 | ||
488 | _enter("{%x:%u},%d,{t=%x,fl=%x,r=%Ld:%Ld}", | |
489 | vnode->fid.vid, vnode->fid.vnode, cmd, | |
490 | fl->fl_type, fl->fl_flags, | |
491 | (long long) fl->fl_start, (long long) fl->fl_end); | |
492 | ||
493 | /* AFS doesn't support mandatory locks */ | |
494 | if ((vnode->vfs_inode.i_mode & (S_ISGID | S_IXGRP)) == S_ISGID && | |
495 | fl->fl_type != F_UNLCK) | |
496 | return -ENOLCK; | |
497 | ||
498 | if (IS_GETLK(cmd)) | |
499 | return afs_do_getlk(file, fl); | |
500 | if (fl->fl_type == F_UNLCK) | |
501 | return afs_do_unlk(file, fl); | |
502 | return afs_do_setlk(file, fl); | |
503 | } | |
504 | ||
505 | /* | |
506 | * manage FLOCK locks on a file | |
507 | */ | |
508 | int afs_flock(struct file *file, int cmd, struct file_lock *fl) | |
509 | { | |
510 | struct afs_vnode *vnode = AFS_FS_I(file->f_dentry->d_inode); | |
511 | ||
512 | _enter("{%x:%u},%d,{t=%x,fl=%x}", | |
513 | vnode->fid.vid, vnode->fid.vnode, cmd, | |
514 | fl->fl_type, fl->fl_flags); | |
515 | ||
516 | /* | |
517 | * No BSD flocks over NFS allowed. | |
518 | * Note: we could try to fake a POSIX lock request here by | |
519 | * using ((u32) filp | 0x80000000) or some such as the pid. | |
520 | * Not sure whether that would be unique, though, or whether | |
521 | * that would break in other places. | |
522 | */ | |
523 | if (!(fl->fl_flags & FL_FLOCK)) | |
524 | return -ENOLCK; | |
525 | ||
526 | /* we're simulating flock() locks using posix locks on the server */ | |
527 | fl->fl_owner = (fl_owner_t) file; | |
528 | fl->fl_start = 0; | |
529 | fl->fl_end = OFFSET_MAX; | |
530 | ||
531 | if (fl->fl_type == F_UNLCK) | |
532 | return afs_do_unlk(file, fl); | |
533 | return afs_do_setlk(file, fl); | |
534 | } | |
535 | ||
536 | /* | |
537 | * the POSIX lock management core VFS code copies the lock record and adds the | |
538 | * copy into its own list, so we need to add that copy to the vnode's lock | |
539 | * queue in the same place as the original (which will be deleted shortly | |
540 | * after) | |
541 | */ | |
542 | static void afs_fl_copy_lock(struct file_lock *new, struct file_lock *fl) | |
543 | { | |
544 | _enter(""); | |
545 | ||
546 | list_add(&new->fl_u.afs.link, &fl->fl_u.afs.link); | |
547 | } | |
548 | ||
549 | /* | |
550 | * need to remove this lock from the vnode queue when it's removed from the | |
551 | * VFS's list | |
552 | */ | |
553 | static void afs_fl_release_private(struct file_lock *fl) | |
554 | { | |
555 | _enter(""); | |
556 | ||
557 | list_del_init(&fl->fl_u.afs.link); | |
558 | } |