Commit | Line | Data |
---|---|---|
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", | |
2f84dd70 | 107 | (unsigned long) 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; | |
87533332 AV |
113 | mutex_lock(&sbi->wq_mutex); |
114 | ||
115 | /* Check if we have become catatonic */ | |
116 | if (sbi->catatonic) { | |
117 | mutex_unlock(&sbi->wq_mutex); | |
118 | return; | |
119 | } | |
5c0a32fc IK |
120 | switch (type) { |
121 | /* Kernel protocol v4 missing and expire packets */ | |
122 | case autofs_ptype_missing: | |
123 | { | |
e8514478 | 124 | struct autofs_packet_missing *mp = &pkt.v4_pkt.missing; |
1da177e4 LT |
125 | |
126 | pktsz = sizeof(*mp); | |
127 | ||
128 | mp->wait_queue_token = wq->wait_queue_token; | |
70b52a0a JM |
129 | mp->len = wq->name.len; |
130 | memcpy(mp->name, wq->name.name, wq->name.len); | |
131 | mp->name[wq->name.len] = '\0'; | |
5c0a32fc IK |
132 | break; |
133 | } | |
134 | case autofs_ptype_expire_multi: | |
135 | { | |
e8514478 | 136 | struct autofs_packet_expire_multi *ep = &pkt.v4_pkt.expire_multi; |
1da177e4 LT |
137 | |
138 | pktsz = sizeof(*ep); | |
139 | ||
140 | ep->wait_queue_token = wq->wait_queue_token; | |
70b52a0a JM |
141 | ep->len = wq->name.len; |
142 | memcpy(ep->name, wq->name.name, wq->name.len); | |
143 | ep->name[wq->name.len] = '\0'; | |
5c0a32fc IK |
144 | break; |
145 | } | |
146 | /* | |
147 | * Kernel protocol v5 packet for handling indirect and direct | |
148 | * mount missing and expire requests | |
149 | */ | |
150 | case autofs_ptype_missing_indirect: | |
151 | case autofs_ptype_expire_indirect: | |
152 | case autofs_ptype_missing_direct: | |
153 | case autofs_ptype_expire_direct: | |
154 | { | |
e8514478 | 155 | struct autofs_v5_packet *packet = &pkt.v5_pkt.v5_packet; |
5c0a32fc IK |
156 | |
157 | pktsz = sizeof(*packet); | |
158 | ||
159 | packet->wait_queue_token = wq->wait_queue_token; | |
70b52a0a JM |
160 | packet->len = wq->name.len; |
161 | memcpy(packet->name, wq->name.name, wq->name.len); | |
162 | packet->name[wq->name.len] = '\0'; | |
5c0a32fc IK |
163 | packet->dev = wq->dev; |
164 | packet->ino = wq->ino; | |
165 | packet->uid = wq->uid; | |
166 | packet->gid = wq->gid; | |
167 | packet->pid = wq->pid; | |
168 | packet->tgid = wq->tgid; | |
169 | break; | |
170 | } | |
171 | default: | |
1da177e4 | 172 | printk("autofs4_notify_daemon: bad type %d!\n", type); |
87533332 | 173 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
174 | return; |
175 | } | |
176 | ||
87533332 AV |
177 | pipe = sbi->pipe; |
178 | get_file(pipe); | |
179 | ||
e64be33c IK |
180 | mutex_unlock(&sbi->wq_mutex); |
181 | ||
87533332 AV |
182 | if (autofs4_write(pipe, &pkt, pktsz)) |
183 | autofs4_catatonic_mode(sbi); | |
184 | fput(pipe); | |
1da177e4 LT |
185 | } |
186 | ||
187 | static int autofs4_getpath(struct autofs_sb_info *sbi, | |
188 | struct dentry *dentry, char **name) | |
189 | { | |
190 | struct dentry *root = sbi->sb->s_root; | |
191 | struct dentry *tmp; | |
949854d0 | 192 | char *buf; |
1da177e4 | 193 | char *p; |
949854d0 NP |
194 | int len; |
195 | unsigned seq; | |
196 | ||
197 | rename_retry: | |
198 | buf = *name; | |
199 | len = 0; | |
b5c84bf6 | 200 | |
949854d0 NP |
201 | seq = read_seqbegin(&rename_lock); |
202 | rcu_read_lock(); | |
e7854723 | 203 | spin_lock(&sbi->fs_lock); |
1da177e4 LT |
204 | for (tmp = dentry ; tmp != root ; tmp = tmp->d_parent) |
205 | len += tmp->d_name.len + 1; | |
206 | ||
cab0936a | 207 | if (!len || --len > NAME_MAX) { |
e7854723 | 208 | spin_unlock(&sbi->fs_lock); |
949854d0 NP |
209 | rcu_read_unlock(); |
210 | if (read_seqretry(&rename_lock, seq)) | |
211 | goto rename_retry; | |
1da177e4 LT |
212 | return 0; |
213 | } | |
214 | ||
215 | *(buf + len) = '\0'; | |
216 | p = buf + len - dentry->d_name.len; | |
217 | strncpy(p, dentry->d_name.name, dentry->d_name.len); | |
218 | ||
219 | for (tmp = dentry->d_parent; tmp != root ; tmp = tmp->d_parent) { | |
220 | *(--p) = '/'; | |
221 | p -= tmp->d_name.len; | |
222 | strncpy(p, tmp->d_name.name, tmp->d_name.len); | |
223 | } | |
e7854723 | 224 | spin_unlock(&sbi->fs_lock); |
949854d0 NP |
225 | rcu_read_unlock(); |
226 | if (read_seqretry(&rename_lock, seq)) | |
227 | goto rename_retry; | |
1da177e4 LT |
228 | |
229 | return len; | |
230 | } | |
231 | ||
a5370553 | 232 | static struct autofs_wait_queue * |
70b52a0a | 233 | autofs4_find_wait(struct autofs_sb_info *sbi, struct qstr *qstr) |
a5370553 IK |
234 | { |
235 | struct autofs_wait_queue *wq; | |
236 | ||
237 | for (wq = sbi->queues; wq; wq = wq->next) { | |
70b52a0a JM |
238 | if (wq->name.hash == qstr->hash && |
239 | wq->name.len == qstr->len && | |
240 | wq->name.name && | |
241 | !memcmp(wq->name.name, qstr->name, qstr->len)) | |
a5370553 IK |
242 | break; |
243 | } | |
244 | return wq; | |
245 | } | |
246 | ||
a1362fe9 IK |
247 | /* |
248 | * Check if we have a valid request. | |
249 | * Returns | |
250 | * 1 if the request should continue. | |
251 | * In this case we can return an autofs_wait_queue entry if one is | |
252 | * found or NULL to idicate a new wait needs to be created. | |
253 | * 0 or a negative errno if the request shouldn't continue. | |
254 | */ | |
255 | static int validate_request(struct autofs_wait_queue **wait, | |
256 | struct autofs_sb_info *sbi, | |
257 | struct qstr *qstr, | |
258 | struct dentry*dentry, enum autofs_notify notify) | |
259 | { | |
260 | struct autofs_wait_queue *wq; | |
261 | struct autofs_info *ino; | |
262 | ||
4041bcdc AV |
263 | if (sbi->catatonic) |
264 | return -ENOENT; | |
265 | ||
a1362fe9 IK |
266 | /* Wait in progress, continue; */ |
267 | wq = autofs4_find_wait(sbi, qstr); | |
268 | if (wq) { | |
269 | *wait = wq; | |
270 | return 1; | |
271 | } | |
272 | ||
273 | *wait = NULL; | |
274 | ||
275 | /* If we don't yet have any info this is a new request */ | |
276 | ino = autofs4_dentry_ino(dentry); | |
277 | if (!ino) | |
278 | return 1; | |
279 | ||
280 | /* | |
281 | * If we've been asked to wait on an existing expire (NFY_NONE) | |
282 | * but there is no wait in the queue ... | |
283 | */ | |
284 | if (notify == NFY_NONE) { | |
285 | /* | |
286 | * Either we've betean the pending expire to post it's | |
287 | * wait or it finished while we waited on the mutex. | |
288 | * So we need to wait till either, the wait appears | |
289 | * or the expire finishes. | |
290 | */ | |
291 | ||
292 | while (ino->flags & AUTOFS_INF_EXPIRING) { | |
293 | mutex_unlock(&sbi->wq_mutex); | |
294 | schedule_timeout_interruptible(HZ/10); | |
295 | if (mutex_lock_interruptible(&sbi->wq_mutex)) | |
296 | return -EINTR; | |
297 | ||
4041bcdc AV |
298 | if (sbi->catatonic) |
299 | return -ENOENT; | |
300 | ||
a1362fe9 IK |
301 | wq = autofs4_find_wait(sbi, qstr); |
302 | if (wq) { | |
303 | *wait = wq; | |
304 | return 1; | |
305 | } | |
306 | } | |
307 | ||
308 | /* | |
309 | * Not ideal but the status has already gone. Of the two | |
310 | * cases where we wait on NFY_NONE neither depend on the | |
311 | * return status of the wait. | |
312 | */ | |
313 | return 0; | |
314 | } | |
315 | ||
316 | /* | |
317 | * If we've been asked to trigger a mount and the request | |
318 | * completed while we waited on the mutex ... | |
319 | */ | |
320 | if (notify == NFY_MOUNT) { | |
9e3fea16 IK |
321 | struct dentry *new = NULL; |
322 | int valid = 1; | |
323 | ||
a1362fe9 | 324 | /* |
463aea1a IK |
325 | * If the dentry was successfully mounted while we slept |
326 | * on the wait queue mutex we can return success. If it | |
327 | * isn't mounted (doesn't have submounts for the case of | |
328 | * a multi-mount with no mount at it's base) we can | |
329 | * continue on and create a new request. | |
330 | */ | |
9e3fea16 IK |
331 | if (!IS_ROOT(dentry)) { |
332 | if (dentry->d_inode && d_unhashed(dentry)) { | |
333 | struct dentry *parent = dentry->d_parent; | |
334 | new = d_lookup(parent, &dentry->d_name); | |
335 | if (new) | |
336 | dentry = new; | |
337 | } | |
338 | } | |
463aea1a | 339 | if (have_submounts(dentry)) |
9e3fea16 IK |
340 | valid = 0; |
341 | ||
342 | if (new) | |
343 | dput(new); | |
344 | return valid; | |
a1362fe9 IK |
345 | } |
346 | ||
347 | return 1; | |
348 | } | |
349 | ||
1da177e4 LT |
350 | int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry, |
351 | enum autofs_notify notify) | |
352 | { | |
353 | struct autofs_wait_queue *wq; | |
70b52a0a | 354 | struct qstr qstr; |
1da177e4 | 355 | char *name; |
a1362fe9 | 356 | int status, ret, type; |
1da177e4 LT |
357 | |
358 | /* In catatonic mode, we don't wait for nobody */ | |
e77fbddf | 359 | if (sbi->catatonic) |
1da177e4 | 360 | return -ENOENT; |
a1362fe9 | 361 | |
c72305b5 IK |
362 | if (!dentry->d_inode) { |
363 | /* | |
364 | * A wait for a negative dentry is invalid for certain | |
365 | * cases. A direct or offset mount "always" has its mount | |
366 | * point directory created and so the request dentry must | |
367 | * be positive or the map key doesn't exist. The situation | |
368 | * is very similar for indirect mounts except only dentrys | |
369 | * in the root of the autofs file system may be negative. | |
370 | */ | |
a92daf6b | 371 | if (autofs_type_trigger(sbi->type)) |
c72305b5 IK |
372 | return -ENOENT; |
373 | else if (!IS_ROOT(dentry->d_parent)) | |
374 | return -ENOENT; | |
375 | } | |
eb3b1767 | 376 | |
1da177e4 LT |
377 | name = kmalloc(NAME_MAX + 1, GFP_KERNEL); |
378 | if (!name) | |
379 | return -ENOMEM; | |
380 | ||
5c0a32fc | 381 | /* If this is a direct mount request create a dummy name */ |
a92daf6b | 382 | if (IS_ROOT(dentry) && autofs_type_trigger(sbi->type)) |
70b52a0a | 383 | qstr.len = sprintf(name, "%p", dentry); |
5c0a32fc | 384 | else { |
70b52a0a JM |
385 | qstr.len = autofs4_getpath(sbi, dentry, &name); |
386 | if (!qstr.len) { | |
5c0a32fc IK |
387 | kfree(name); |
388 | return -ENOENT; | |
389 | } | |
1da177e4 | 390 | } |
70b52a0a JM |
391 | qstr.name = name; |
392 | qstr.hash = full_name_hash(name, qstr.len); | |
1da177e4 | 393 | |
f4c7da02 IK |
394 | if (mutex_lock_interruptible(&sbi->wq_mutex)) { |
395 | kfree(qstr.name); | |
1da177e4 | 396 | return -EINTR; |
f4c7da02 | 397 | } |
a5370553 | 398 | |
a1362fe9 IK |
399 | ret = validate_request(&wq, sbi, &qstr, dentry, notify); |
400 | if (ret <= 0) { | |
4041bcdc | 401 | if (ret != -EINTR) |
1d5599e3 | 402 | mutex_unlock(&sbi->wq_mutex); |
a1362fe9 IK |
403 | kfree(qstr.name); |
404 | return ret; | |
a5370553 | 405 | } |
cc9acc88 | 406 | |
a5370553 | 407 | if (!wq) { |
1da177e4 LT |
408 | /* Create a new wait queue */ |
409 | wq = kmalloc(sizeof(struct autofs_wait_queue),GFP_KERNEL); | |
e77fbddf | 410 | if (!wq) { |
70b52a0a | 411 | kfree(qstr.name); |
1d5599e3 | 412 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
413 | return -ENOMEM; |
414 | } | |
415 | ||
416 | wq->wait_queue_token = autofs4_next_wait_queue; | |
417 | if (++autofs4_next_wait_queue == 0) | |
418 | autofs4_next_wait_queue = 1; | |
419 | wq->next = sbi->queues; | |
420 | sbi->queues = wq; | |
421 | init_waitqueue_head(&wq->queue); | |
70b52a0a | 422 | memcpy(&wq->name, &qstr, sizeof(struct qstr)); |
5c0a32fc IK |
423 | wq->dev = autofs4_get_dev(sbi); |
424 | wq->ino = autofs4_get_ino(sbi); | |
0eb790e3 DH |
425 | wq->uid = current_uid(); |
426 | wq->gid = current_gid(); | |
5c0a32fc IK |
427 | wq->pid = current->pid; |
428 | wq->tgid = current->tgid; | |
1da177e4 | 429 | wq->status = -EINTR; /* Status return if interrupted */ |
296f7bf7 | 430 | wq->wait_ctr = 2; |
1d5599e3 | 431 | mutex_unlock(&sbi->wq_mutex); |
3e7b1919 | 432 | |
5c0a32fc IK |
433 | if (sbi->version < 5) { |
434 | if (notify == NFY_MOUNT) | |
435 | type = autofs_ptype_missing; | |
436 | else | |
437 | type = autofs_ptype_expire_multi; | |
438 | } else { | |
439 | if (notify == NFY_MOUNT) | |
a92daf6b | 440 | type = autofs_type_trigger(sbi->type) ? |
5c0a32fc IK |
441 | autofs_ptype_missing_direct : |
442 | autofs_ptype_missing_indirect; | |
443 | else | |
a92daf6b | 444 | type = autofs_type_trigger(sbi->type) ? |
5c0a32fc IK |
445 | autofs_ptype_expire_direct : |
446 | autofs_ptype_expire_indirect; | |
447 | } | |
4dcd00b1 | 448 | |
682d4fc9 | 449 | DPRINTK("new wait id = 0x%08lx, name = %.*s, nfy=%d\n", |
70b52a0a JM |
450 | (unsigned long) wq->wait_queue_token, wq->name.len, |
451 | wq->name.name, notify); | |
4dcd00b1 IK |
452 | |
453 | /* autofs4_notify_daemon() may block */ | |
454 | autofs4_notify_daemon(sbi, wq, type); | |
a5370553 | 455 | } else { |
296f7bf7 | 456 | wq->wait_ctr++; |
a5370553 | 457 | mutex_unlock(&sbi->wq_mutex); |
70b52a0a | 458 | kfree(qstr.name); |
a5370553 | 459 | DPRINTK("existing wait id = 0x%08lx, name = %.*s, nfy=%d", |
70b52a0a JM |
460 | (unsigned long) wq->wait_queue_token, wq->name.len, |
461 | wq->name.name, notify); | |
4dcd00b1 IK |
462 | } |
463 | ||
5a11d4d0 IK |
464 | /* |
465 | * wq->name.name is NULL iff the lock is already released | |
466 | * or the mount has been made catatonic. | |
467 | */ | |
70b52a0a | 468 | if (wq->name.name) { |
1da177e4 LT |
469 | /* Block all but "shutdown" signals while waiting */ |
470 | sigset_t oldset; | |
471 | unsigned long irqflags; | |
472 | ||
473 | spin_lock_irqsave(¤t->sighand->siglock, irqflags); | |
474 | oldset = current->blocked; | |
475 | siginitsetinv(¤t->blocked, SHUTDOWN_SIGS & ~oldset.sig[0]); | |
476 | recalc_sigpending(); | |
477 | spin_unlock_irqrestore(¤t->sighand->siglock, irqflags); | |
478 | ||
70b52a0a | 479 | wait_event_interruptible(wq->queue, wq->name.name == NULL); |
1da177e4 LT |
480 | |
481 | spin_lock_irqsave(¤t->sighand->siglock, irqflags); | |
482 | current->blocked = oldset; | |
483 | recalc_sigpending(); | |
484 | spin_unlock_irqrestore(¤t->sighand->siglock, irqflags); | |
485 | } else { | |
486 | DPRINTK("skipped sleeping"); | |
487 | } | |
488 | ||
489 | status = wq->status; | |
490 | ||
c0f54d3e IK |
491 | /* |
492 | * For direct and offset mounts we need to track the requester's | |
493 | * uid and gid in the dentry info struct. This is so it can be | |
494 | * supplied, on request, by the misc device ioctl interface. | |
495 | * This is needed during daemon resatart when reconnecting | |
496 | * to existing, active, autofs mounts. The uid and gid (and | |
497 | * related string values) may be used for macro substitution | |
498 | * in autofs mount maps. | |
499 | */ | |
500 | if (!status) { | |
501 | struct autofs_info *ino; | |
502 | struct dentry *de = NULL; | |
503 | ||
504 | /* direct mount or browsable map */ | |
505 | ino = autofs4_dentry_ino(dentry); | |
506 | if (!ino) { | |
507 | /* If not lookup actual dentry used */ | |
508 | de = d_lookup(dentry->d_parent, &dentry->d_name); | |
509 | if (de) | |
510 | ino = autofs4_dentry_ino(de); | |
511 | } | |
512 | ||
513 | /* Set mount requester */ | |
514 | if (ino) { | |
515 | spin_lock(&sbi->fs_lock); | |
516 | ino->uid = wq->uid; | |
517 | ino->gid = wq->gid; | |
518 | spin_unlock(&sbi->fs_lock); | |
519 | } | |
520 | ||
521 | if (de) | |
522 | dput(de); | |
523 | } | |
524 | ||
1da177e4 | 525 | /* Are we the last process to need status? */ |
296f7bf7 IK |
526 | mutex_lock(&sbi->wq_mutex); |
527 | if (!--wq->wait_ctr) | |
1da177e4 | 528 | kfree(wq); |
296f7bf7 | 529 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
530 | |
531 | return status; | |
532 | } | |
533 | ||
534 | ||
535 | int autofs4_wait_release(struct autofs_sb_info *sbi, autofs_wqt_t wait_queue_token, int status) | |
536 | { | |
537 | struct autofs_wait_queue *wq, **wql; | |
538 | ||
1d5599e3 | 539 | mutex_lock(&sbi->wq_mutex); |
c80544dc | 540 | for (wql = &sbi->queues; (wq = *wql) != NULL; wql = &wq->next) { |
e77fbddf | 541 | if (wq->wait_queue_token == wait_queue_token) |
1da177e4 LT |
542 | break; |
543 | } | |
544 | ||
e77fbddf | 545 | if (!wq) { |
1d5599e3 | 546 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
547 | return -EINVAL; |
548 | } | |
549 | ||
550 | *wql = wq->next; /* Unlink from chain */ | |
70b52a0a JM |
551 | kfree(wq->name.name); |
552 | wq->name.name = NULL; /* Do not wait on this queue */ | |
1da177e4 | 553 | wq->status = status; |
296f7bf7 IK |
554 | wake_up_interruptible(&wq->queue); |
555 | if (!--wq->wait_ctr) | |
1da177e4 | 556 | kfree(wq); |
296f7bf7 | 557 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
558 | |
559 | return 0; | |
560 | } | |
561 |