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1da177e4 LT |
1 | /* -*- c -*- --------------------------------------------------------------- * |
2 | * | |
3 | * linux/fs/autofs/waitq.c | |
4 | * | |
5 | * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved | |
5c0a32fc | 6 | * Copyright 2001-2006 Ian Kent <raven@themaw.net> |
1da177e4 LT |
7 | * |
8 | * This file is part of the Linux kernel and is made available under | |
9 | * the terms of the GNU General Public License, version 2, or at your | |
10 | * option, any later version, incorporated herein by reference. | |
11 | * | |
12 | * ------------------------------------------------------------------------- */ | |
13 | ||
14 | #include <linux/slab.h> | |
15 | #include <linux/time.h> | |
16 | #include <linux/signal.h> | |
17 | #include <linux/file.h> | |
18 | #include "autofs_i.h" | |
19 | ||
20 | /* We make this a static variable rather than a part of the superblock; it | |
21 | is better if we don't reassign numbers easily even across filesystems */ | |
22 | static autofs_wqt_t autofs4_next_wait_queue = 1; | |
23 | ||
24 | /* These are the signals we allow interrupting a pending mount */ | |
25 | #define SHUTDOWN_SIGS (sigmask(SIGKILL) | sigmask(SIGINT) | sigmask(SIGQUIT)) | |
26 | ||
27 | void autofs4_catatonic_mode(struct autofs_sb_info *sbi) | |
28 | { | |
29 | struct autofs_wait_queue *wq, *nwq; | |
30 | ||
5a11d4d0 IK |
31 | mutex_lock(&sbi->wq_mutex); |
32 | if (sbi->catatonic) { | |
33 | mutex_unlock(&sbi->wq_mutex); | |
34 | return; | |
35 | } | |
36 | ||
1da177e4 LT |
37 | DPRINTK("entering catatonic mode"); |
38 | ||
39 | sbi->catatonic = 1; | |
40 | wq = sbi->queues; | |
41 | sbi->queues = NULL; /* Erase all wait queues */ | |
e77fbddf | 42 | while (wq) { |
1da177e4 LT |
43 | nwq = wq->next; |
44 | wq->status = -ENOENT; /* Magic is gone - report failure */ | |
70b52a0a JM |
45 | if (wq->name.name) { |
46 | kfree(wq->name.name); | |
47 | wq->name.name = NULL; | |
48 | } | |
296f7bf7 | 49 | wq->wait_ctr--; |
1da177e4 LT |
50 | wake_up_interruptible(&wq->queue); |
51 | wq = nwq; | |
52 | } | |
ba8df43c IK |
53 | fput(sbi->pipe); /* Close the pipe */ |
54 | sbi->pipe = NULL; | |
5a11d4d0 IK |
55 | sbi->pipefd = -1; |
56 | mutex_unlock(&sbi->wq_mutex); | |
1da177e4 LT |
57 | } |
58 | ||
59 | static int autofs4_write(struct file *file, const void *addr, int bytes) | |
60 | { | |
61 | unsigned long sigpipe, flags; | |
62 | mm_segment_t fs; | |
63 | const char *data = (const char *)addr; | |
64 | ssize_t wr = 0; | |
65 | ||
66 | /** WARNING: this is not safe for writing more than PIPE_BUF bytes! **/ | |
67 | ||
68 | sigpipe = sigismember(¤t->pending.signal, SIGPIPE); | |
69 | ||
70 | /* Save pointer to user space and point back to kernel space */ | |
71 | fs = get_fs(); | |
72 | set_fs(KERNEL_DS); | |
73 | ||
74 | while (bytes && | |
75 | (wr = file->f_op->write(file,data,bytes,&file->f_pos)) > 0) { | |
76 | data += wr; | |
77 | bytes -= wr; | |
78 | } | |
79 | ||
80 | set_fs(fs); | |
81 | ||
82 | /* Keep the currently executing process from receiving a | |
83 | SIGPIPE unless it was already supposed to get one */ | |
84 | if (wr == -EPIPE && !sigpipe) { | |
85 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
86 | sigdelset(¤t->pending.signal, SIGPIPE); | |
87 | recalc_sigpending(); | |
88 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
89 | } | |
90 | ||
91 | return (bytes > 0); | |
92 | } | |
93 | ||
94 | static void autofs4_notify_daemon(struct autofs_sb_info *sbi, | |
95 | struct autofs_wait_queue *wq, | |
96 | int type) | |
97 | { | |
e8514478 IK |
98 | union { |
99 | struct autofs_packet_hdr hdr; | |
100 | union autofs_packet_union v4_pkt; | |
101 | union autofs_v5_packet_union v5_pkt; | |
102 | } pkt; | |
e64be33c | 103 | struct file *pipe = NULL; |
1da177e4 LT |
104 | size_t pktsz; |
105 | ||
106 | DPRINTK("wait id = 0x%08lx, name = %.*s, type=%d", | |
70b52a0a | 107 | wq->wait_queue_token, wq->name.len, wq->name.name, type); |
1da177e4 LT |
108 | |
109 | memset(&pkt,0,sizeof pkt); /* For security reasons */ | |
110 | ||
111 | pkt.hdr.proto_version = sbi->version; | |
112 | pkt.hdr.type = type; | |
5c0a32fc IK |
113 | switch (type) { |
114 | /* Kernel protocol v4 missing and expire packets */ | |
115 | case autofs_ptype_missing: | |
116 | { | |
e8514478 | 117 | struct autofs_packet_missing *mp = &pkt.v4_pkt.missing; |
1da177e4 LT |
118 | |
119 | pktsz = sizeof(*mp); | |
120 | ||
121 | mp->wait_queue_token = wq->wait_queue_token; | |
70b52a0a JM |
122 | mp->len = wq->name.len; |
123 | memcpy(mp->name, wq->name.name, wq->name.len); | |
124 | mp->name[wq->name.len] = '\0'; | |
5c0a32fc IK |
125 | break; |
126 | } | |
127 | case autofs_ptype_expire_multi: | |
128 | { | |
e8514478 | 129 | struct autofs_packet_expire_multi *ep = &pkt.v4_pkt.expire_multi; |
1da177e4 LT |
130 | |
131 | pktsz = sizeof(*ep); | |
132 | ||
133 | ep->wait_queue_token = wq->wait_queue_token; | |
70b52a0a JM |
134 | ep->len = wq->name.len; |
135 | memcpy(ep->name, wq->name.name, wq->name.len); | |
136 | ep->name[wq->name.len] = '\0'; | |
5c0a32fc IK |
137 | break; |
138 | } | |
139 | /* | |
140 | * Kernel protocol v5 packet for handling indirect and direct | |
141 | * mount missing and expire requests | |
142 | */ | |
143 | case autofs_ptype_missing_indirect: | |
144 | case autofs_ptype_expire_indirect: | |
145 | case autofs_ptype_missing_direct: | |
146 | case autofs_ptype_expire_direct: | |
147 | { | |
e8514478 | 148 | struct autofs_v5_packet *packet = &pkt.v5_pkt.v5_packet; |
5c0a32fc IK |
149 | |
150 | pktsz = sizeof(*packet); | |
151 | ||
152 | packet->wait_queue_token = wq->wait_queue_token; | |
70b52a0a JM |
153 | packet->len = wq->name.len; |
154 | memcpy(packet->name, wq->name.name, wq->name.len); | |
155 | packet->name[wq->name.len] = '\0'; | |
5c0a32fc IK |
156 | packet->dev = wq->dev; |
157 | packet->ino = wq->ino; | |
158 | packet->uid = wq->uid; | |
159 | packet->gid = wq->gid; | |
160 | packet->pid = wq->pid; | |
161 | packet->tgid = wq->tgid; | |
162 | break; | |
163 | } | |
164 | default: | |
1da177e4 LT |
165 | printk("autofs4_notify_daemon: bad type %d!\n", type); |
166 | return; | |
167 | } | |
168 | ||
e64be33c IK |
169 | /* Check if we have become catatonic */ |
170 | mutex_lock(&sbi->wq_mutex); | |
171 | if (!sbi->catatonic) { | |
172 | pipe = sbi->pipe; | |
173 | get_file(pipe); | |
174 | } | |
175 | mutex_unlock(&sbi->wq_mutex); | |
176 | ||
177 | if (pipe) { | |
178 | if (autofs4_write(pipe, &pkt, pktsz)) | |
179 | autofs4_catatonic_mode(sbi); | |
180 | fput(pipe); | |
181 | } | |
1da177e4 LT |
182 | } |
183 | ||
184 | static int autofs4_getpath(struct autofs_sb_info *sbi, | |
185 | struct dentry *dentry, char **name) | |
186 | { | |
187 | struct dentry *root = sbi->sb->s_root; | |
188 | struct dentry *tmp; | |
949854d0 | 189 | char *buf; |
1da177e4 | 190 | char *p; |
949854d0 NP |
191 | int len; |
192 | unsigned seq; | |
193 | ||
194 | rename_retry: | |
195 | buf = *name; | |
196 | len = 0; | |
b5c84bf6 | 197 | |
949854d0 NP |
198 | seq = read_seqbegin(&rename_lock); |
199 | rcu_read_lock(); | |
e7854723 | 200 | spin_lock(&sbi->fs_lock); |
1da177e4 LT |
201 | for (tmp = dentry ; tmp != root ; tmp = tmp->d_parent) |
202 | len += tmp->d_name.len + 1; | |
203 | ||
cab0936a | 204 | if (!len || --len > NAME_MAX) { |
e7854723 | 205 | spin_unlock(&sbi->fs_lock); |
949854d0 NP |
206 | rcu_read_unlock(); |
207 | if (read_seqretry(&rename_lock, seq)) | |
208 | goto rename_retry; | |
1da177e4 LT |
209 | return 0; |
210 | } | |
211 | ||
212 | *(buf + len) = '\0'; | |
213 | p = buf + len - dentry->d_name.len; | |
214 | strncpy(p, dentry->d_name.name, dentry->d_name.len); | |
215 | ||
216 | for (tmp = dentry->d_parent; tmp != root ; tmp = tmp->d_parent) { | |
217 | *(--p) = '/'; | |
218 | p -= tmp->d_name.len; | |
219 | strncpy(p, tmp->d_name.name, tmp->d_name.len); | |
220 | } | |
e7854723 | 221 | spin_unlock(&sbi->fs_lock); |
949854d0 NP |
222 | rcu_read_unlock(); |
223 | if (read_seqretry(&rename_lock, seq)) | |
224 | goto rename_retry; | |
1da177e4 LT |
225 | |
226 | return len; | |
227 | } | |
228 | ||
a5370553 | 229 | static struct autofs_wait_queue * |
70b52a0a | 230 | autofs4_find_wait(struct autofs_sb_info *sbi, struct qstr *qstr) |
a5370553 IK |
231 | { |
232 | struct autofs_wait_queue *wq; | |
233 | ||
234 | for (wq = sbi->queues; wq; wq = wq->next) { | |
70b52a0a JM |
235 | if (wq->name.hash == qstr->hash && |
236 | wq->name.len == qstr->len && | |
237 | wq->name.name && | |
238 | !memcmp(wq->name.name, qstr->name, qstr->len)) | |
a5370553 IK |
239 | break; |
240 | } | |
241 | return wq; | |
242 | } | |
243 | ||
a1362fe9 IK |
244 | /* |
245 | * Check if we have a valid request. | |
246 | * Returns | |
247 | * 1 if the request should continue. | |
248 | * In this case we can return an autofs_wait_queue entry if one is | |
249 | * found or NULL to idicate a new wait needs to be created. | |
250 | * 0 or a negative errno if the request shouldn't continue. | |
251 | */ | |
252 | static int validate_request(struct autofs_wait_queue **wait, | |
253 | struct autofs_sb_info *sbi, | |
254 | struct qstr *qstr, | |
255 | struct dentry*dentry, enum autofs_notify notify) | |
256 | { | |
257 | struct autofs_wait_queue *wq; | |
258 | struct autofs_info *ino; | |
259 | ||
260 | /* Wait in progress, continue; */ | |
261 | wq = autofs4_find_wait(sbi, qstr); | |
262 | if (wq) { | |
263 | *wait = wq; | |
264 | return 1; | |
265 | } | |
266 | ||
267 | *wait = NULL; | |
268 | ||
269 | /* If we don't yet have any info this is a new request */ | |
270 | ino = autofs4_dentry_ino(dentry); | |
271 | if (!ino) | |
272 | return 1; | |
273 | ||
274 | /* | |
275 | * If we've been asked to wait on an existing expire (NFY_NONE) | |
276 | * but there is no wait in the queue ... | |
277 | */ | |
278 | if (notify == NFY_NONE) { | |
279 | /* | |
280 | * Either we've betean the pending expire to post it's | |
281 | * wait or it finished while we waited on the mutex. | |
282 | * So we need to wait till either, the wait appears | |
283 | * or the expire finishes. | |
284 | */ | |
285 | ||
286 | while (ino->flags & AUTOFS_INF_EXPIRING) { | |
287 | mutex_unlock(&sbi->wq_mutex); | |
288 | schedule_timeout_interruptible(HZ/10); | |
289 | if (mutex_lock_interruptible(&sbi->wq_mutex)) | |
290 | return -EINTR; | |
291 | ||
292 | wq = autofs4_find_wait(sbi, qstr); | |
293 | if (wq) { | |
294 | *wait = wq; | |
295 | return 1; | |
296 | } | |
297 | } | |
298 | ||
299 | /* | |
300 | * Not ideal but the status has already gone. Of the two | |
301 | * cases where we wait on NFY_NONE neither depend on the | |
302 | * return status of the wait. | |
303 | */ | |
304 | return 0; | |
305 | } | |
306 | ||
307 | /* | |
308 | * If we've been asked to trigger a mount and the request | |
309 | * completed while we waited on the mutex ... | |
310 | */ | |
311 | if (notify == NFY_MOUNT) { | |
9e3fea16 IK |
312 | struct dentry *new = NULL; |
313 | int valid = 1; | |
314 | ||
a1362fe9 | 315 | /* |
463aea1a IK |
316 | * If the dentry was successfully mounted while we slept |
317 | * on the wait queue mutex we can return success. If it | |
318 | * isn't mounted (doesn't have submounts for the case of | |
319 | * a multi-mount with no mount at it's base) we can | |
320 | * continue on and create a new request. | |
321 | */ | |
9e3fea16 IK |
322 | if (!IS_ROOT(dentry)) { |
323 | if (dentry->d_inode && d_unhashed(dentry)) { | |
324 | struct dentry *parent = dentry->d_parent; | |
325 | new = d_lookup(parent, &dentry->d_name); | |
326 | if (new) | |
327 | dentry = new; | |
328 | } | |
329 | } | |
463aea1a | 330 | if (have_submounts(dentry)) |
9e3fea16 IK |
331 | valid = 0; |
332 | ||
333 | if (new) | |
334 | dput(new); | |
335 | return valid; | |
a1362fe9 IK |
336 | } |
337 | ||
338 | return 1; | |
339 | } | |
340 | ||
1da177e4 LT |
341 | int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry, |
342 | enum autofs_notify notify) | |
343 | { | |
344 | struct autofs_wait_queue *wq; | |
70b52a0a | 345 | struct qstr qstr; |
1da177e4 | 346 | char *name; |
a1362fe9 | 347 | int status, ret, type; |
1da177e4 LT |
348 | |
349 | /* In catatonic mode, we don't wait for nobody */ | |
e77fbddf | 350 | if (sbi->catatonic) |
1da177e4 | 351 | return -ENOENT; |
a1362fe9 | 352 | |
c72305b5 IK |
353 | if (!dentry->d_inode) { |
354 | /* | |
355 | * A wait for a negative dentry is invalid for certain | |
356 | * cases. A direct or offset mount "always" has its mount | |
357 | * point directory created and so the request dentry must | |
358 | * be positive or the map key doesn't exist. The situation | |
359 | * is very similar for indirect mounts except only dentrys | |
360 | * in the root of the autofs file system may be negative. | |
361 | */ | |
a92daf6b | 362 | if (autofs_type_trigger(sbi->type)) |
c72305b5 IK |
363 | return -ENOENT; |
364 | else if (!IS_ROOT(dentry->d_parent)) | |
365 | return -ENOENT; | |
366 | } | |
eb3b1767 | 367 | |
1da177e4 LT |
368 | name = kmalloc(NAME_MAX + 1, GFP_KERNEL); |
369 | if (!name) | |
370 | return -ENOMEM; | |
371 | ||
5c0a32fc | 372 | /* If this is a direct mount request create a dummy name */ |
a92daf6b | 373 | if (IS_ROOT(dentry) && autofs_type_trigger(sbi->type)) |
70b52a0a | 374 | qstr.len = sprintf(name, "%p", dentry); |
5c0a32fc | 375 | else { |
70b52a0a JM |
376 | qstr.len = autofs4_getpath(sbi, dentry, &name); |
377 | if (!qstr.len) { | |
5c0a32fc IK |
378 | kfree(name); |
379 | return -ENOENT; | |
380 | } | |
1da177e4 | 381 | } |
70b52a0a JM |
382 | qstr.name = name; |
383 | qstr.hash = full_name_hash(name, qstr.len); | |
1da177e4 | 384 | |
f4c7da02 IK |
385 | if (mutex_lock_interruptible(&sbi->wq_mutex)) { |
386 | kfree(qstr.name); | |
1da177e4 | 387 | return -EINTR; |
f4c7da02 | 388 | } |
a5370553 | 389 | |
a1362fe9 IK |
390 | ret = validate_request(&wq, sbi, &qstr, dentry, notify); |
391 | if (ret <= 0) { | |
392 | if (ret == 0) | |
1d5599e3 | 393 | mutex_unlock(&sbi->wq_mutex); |
a1362fe9 IK |
394 | kfree(qstr.name); |
395 | return ret; | |
a5370553 | 396 | } |
cc9acc88 | 397 | |
a5370553 | 398 | if (!wq) { |
1da177e4 LT |
399 | /* Create a new wait queue */ |
400 | wq = kmalloc(sizeof(struct autofs_wait_queue),GFP_KERNEL); | |
e77fbddf | 401 | if (!wq) { |
70b52a0a | 402 | kfree(qstr.name); |
1d5599e3 | 403 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
404 | return -ENOMEM; |
405 | } | |
406 | ||
407 | wq->wait_queue_token = autofs4_next_wait_queue; | |
408 | if (++autofs4_next_wait_queue == 0) | |
409 | autofs4_next_wait_queue = 1; | |
410 | wq->next = sbi->queues; | |
411 | sbi->queues = wq; | |
412 | init_waitqueue_head(&wq->queue); | |
70b52a0a | 413 | memcpy(&wq->name, &qstr, sizeof(struct qstr)); |
5c0a32fc IK |
414 | wq->dev = autofs4_get_dev(sbi); |
415 | wq->ino = autofs4_get_ino(sbi); | |
0eb790e3 DH |
416 | wq->uid = current_uid(); |
417 | wq->gid = current_gid(); | |
5c0a32fc IK |
418 | wq->pid = current->pid; |
419 | wq->tgid = current->tgid; | |
1da177e4 | 420 | wq->status = -EINTR; /* Status return if interrupted */ |
296f7bf7 | 421 | wq->wait_ctr = 2; |
1d5599e3 | 422 | mutex_unlock(&sbi->wq_mutex); |
3e7b1919 | 423 | |
5c0a32fc IK |
424 | if (sbi->version < 5) { |
425 | if (notify == NFY_MOUNT) | |
426 | type = autofs_ptype_missing; | |
427 | else | |
428 | type = autofs_ptype_expire_multi; | |
429 | } else { | |
430 | if (notify == NFY_MOUNT) | |
a92daf6b | 431 | type = autofs_type_trigger(sbi->type) ? |
5c0a32fc IK |
432 | autofs_ptype_missing_direct : |
433 | autofs_ptype_missing_indirect; | |
434 | else | |
a92daf6b | 435 | type = autofs_type_trigger(sbi->type) ? |
5c0a32fc IK |
436 | autofs_ptype_expire_direct : |
437 | autofs_ptype_expire_indirect; | |
438 | } | |
4dcd00b1 | 439 | |
682d4fc9 | 440 | DPRINTK("new wait id = 0x%08lx, name = %.*s, nfy=%d\n", |
70b52a0a JM |
441 | (unsigned long) wq->wait_queue_token, wq->name.len, |
442 | wq->name.name, notify); | |
4dcd00b1 IK |
443 | |
444 | /* autofs4_notify_daemon() may block */ | |
445 | autofs4_notify_daemon(sbi, wq, type); | |
a5370553 | 446 | } else { |
296f7bf7 | 447 | wq->wait_ctr++; |
a5370553 | 448 | mutex_unlock(&sbi->wq_mutex); |
70b52a0a | 449 | kfree(qstr.name); |
a5370553 | 450 | DPRINTK("existing wait id = 0x%08lx, name = %.*s, nfy=%d", |
70b52a0a JM |
451 | (unsigned long) wq->wait_queue_token, wq->name.len, |
452 | wq->name.name, notify); | |
4dcd00b1 IK |
453 | } |
454 | ||
5a11d4d0 IK |
455 | /* |
456 | * wq->name.name is NULL iff the lock is already released | |
457 | * or the mount has been made catatonic. | |
458 | */ | |
70b52a0a | 459 | if (wq->name.name) { |
1da177e4 LT |
460 | /* Block all but "shutdown" signals while waiting */ |
461 | sigset_t oldset; | |
462 | unsigned long irqflags; | |
463 | ||
464 | spin_lock_irqsave(¤t->sighand->siglock, irqflags); | |
465 | oldset = current->blocked; | |
466 | siginitsetinv(¤t->blocked, SHUTDOWN_SIGS & ~oldset.sig[0]); | |
467 | recalc_sigpending(); | |
468 | spin_unlock_irqrestore(¤t->sighand->siglock, irqflags); | |
469 | ||
70b52a0a | 470 | wait_event_interruptible(wq->queue, wq->name.name == NULL); |
1da177e4 LT |
471 | |
472 | spin_lock_irqsave(¤t->sighand->siglock, irqflags); | |
473 | current->blocked = oldset; | |
474 | recalc_sigpending(); | |
475 | spin_unlock_irqrestore(¤t->sighand->siglock, irqflags); | |
476 | } else { | |
477 | DPRINTK("skipped sleeping"); | |
478 | } | |
479 | ||
480 | status = wq->status; | |
481 | ||
c0f54d3e IK |
482 | /* |
483 | * For direct and offset mounts we need to track the requester's | |
484 | * uid and gid in the dentry info struct. This is so it can be | |
485 | * supplied, on request, by the misc device ioctl interface. | |
486 | * This is needed during daemon resatart when reconnecting | |
487 | * to existing, active, autofs mounts. The uid and gid (and | |
488 | * related string values) may be used for macro substitution | |
489 | * in autofs mount maps. | |
490 | */ | |
491 | if (!status) { | |
492 | struct autofs_info *ino; | |
493 | struct dentry *de = NULL; | |
494 | ||
495 | /* direct mount or browsable map */ | |
496 | ino = autofs4_dentry_ino(dentry); | |
497 | if (!ino) { | |
498 | /* If not lookup actual dentry used */ | |
499 | de = d_lookup(dentry->d_parent, &dentry->d_name); | |
500 | if (de) | |
501 | ino = autofs4_dentry_ino(de); | |
502 | } | |
503 | ||
504 | /* Set mount requester */ | |
505 | if (ino) { | |
506 | spin_lock(&sbi->fs_lock); | |
507 | ino->uid = wq->uid; | |
508 | ino->gid = wq->gid; | |
509 | spin_unlock(&sbi->fs_lock); | |
510 | } | |
511 | ||
512 | if (de) | |
513 | dput(de); | |
514 | } | |
515 | ||
1da177e4 | 516 | /* Are we the last process to need status? */ |
296f7bf7 IK |
517 | mutex_lock(&sbi->wq_mutex); |
518 | if (!--wq->wait_ctr) | |
1da177e4 | 519 | kfree(wq); |
296f7bf7 | 520 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
521 | |
522 | return status; | |
523 | } | |
524 | ||
525 | ||
526 | int autofs4_wait_release(struct autofs_sb_info *sbi, autofs_wqt_t wait_queue_token, int status) | |
527 | { | |
528 | struct autofs_wait_queue *wq, **wql; | |
529 | ||
1d5599e3 | 530 | mutex_lock(&sbi->wq_mutex); |
c80544dc | 531 | for (wql = &sbi->queues; (wq = *wql) != NULL; wql = &wq->next) { |
e77fbddf | 532 | if (wq->wait_queue_token == wait_queue_token) |
1da177e4 LT |
533 | break; |
534 | } | |
535 | ||
e77fbddf | 536 | if (!wq) { |
1d5599e3 | 537 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
538 | return -EINVAL; |
539 | } | |
540 | ||
541 | *wql = wq->next; /* Unlink from chain */ | |
70b52a0a JM |
542 | kfree(wq->name.name); |
543 | wq->name.name = NULL; /* Do not wait on this queue */ | |
1da177e4 | 544 | wq->status = status; |
296f7bf7 IK |
545 | wake_up_interruptible(&wq->queue); |
546 | if (!--wq->wait_ctr) | |
1da177e4 | 547 | kfree(wq); |
296f7bf7 | 548 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
549 | |
550 | return 0; | |
551 | } | |
552 |