Commit | Line | Data |
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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 */ | |
5140a8ce TG |
45 | kfree(wq->name.name); |
46 | wq->name.name = NULL; | |
296f7bf7 | 47 | wq->wait_ctr--; |
1da177e4 LT |
48 | wake_up_interruptible(&wq->queue); |
49 | wq = nwq; | |
50 | } | |
ba8df43c IK |
51 | fput(sbi->pipe); /* Close the pipe */ |
52 | sbi->pipe = NULL; | |
5a11d4d0 IK |
53 | sbi->pipefd = -1; |
54 | mutex_unlock(&sbi->wq_mutex); | |
1da177e4 LT |
55 | } |
56 | ||
d668dc56 AV |
57 | static int autofs4_write(struct autofs_sb_info *sbi, |
58 | struct file *file, const void *addr, int bytes) | |
1da177e4 LT |
59 | { |
60 | unsigned long sigpipe, flags; | |
61 | mm_segment_t fs; | |
62 | const char *data = (const char *)addr; | |
63 | ssize_t wr = 0; | |
64 | ||
1da177e4 LT |
65 | sigpipe = sigismember(¤t->pending.signal, SIGPIPE); |
66 | ||
67 | /* Save pointer to user space and point back to kernel space */ | |
68 | fs = get_fs(); | |
69 | set_fs(KERNEL_DS); | |
70 | ||
d668dc56 | 71 | mutex_lock(&sbi->pipe_mutex); |
1da177e4 LT |
72 | while (bytes && |
73 | (wr = file->f_op->write(file,data,bytes,&file->f_pos)) > 0) { | |
74 | data += wr; | |
75 | bytes -= wr; | |
76 | } | |
8638094e | 77 | mutex_unlock(&sbi->pipe_mutex); |
1da177e4 LT |
78 | |
79 | set_fs(fs); | |
80 | ||
81 | /* Keep the currently executing process from receiving a | |
82 | SIGPIPE unless it was already supposed to get one */ | |
83 | if (wr == -EPIPE && !sigpipe) { | |
84 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
85 | sigdelset(¤t->pending.signal, SIGPIPE); | |
86 | recalc_sigpending(); | |
87 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
88 | } | |
89 | ||
90 | return (bytes > 0); | |
91 | } | |
fcbf94b9 | 92 | |
1da177e4 LT |
93 | static void autofs4_notify_daemon(struct autofs_sb_info *sbi, |
94 | struct autofs_wait_queue *wq, | |
95 | int type) | |
96 | { | |
e8514478 IK |
97 | union { |
98 | struct autofs_packet_hdr hdr; | |
99 | union autofs_packet_union v4_pkt; | |
100 | union autofs_v5_packet_union v5_pkt; | |
101 | } pkt; | |
e64be33c | 102 | struct file *pipe = NULL; |
1da177e4 LT |
103 | size_t pktsz; |
104 | ||
105 | DPRINTK("wait id = 0x%08lx, name = %.*s, type=%d", | |
2f84dd70 | 106 | (unsigned long) wq->wait_queue_token, wq->name.len, wq->name.name, type); |
1da177e4 LT |
107 | |
108 | memset(&pkt,0,sizeof pkt); /* For security reasons */ | |
109 | ||
110 | pkt.hdr.proto_version = sbi->version; | |
111 | pkt.hdr.type = type; | |
87533332 | 112 | |
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; |
45634cd8 | 149 | struct user_namespace *user_ns = sbi->pipe->f_cred->user_ns; |
5c0a32fc | 150 | |
fcbf94b9 LT |
151 | pktsz = sizeof(*packet); |
152 | ||
5c0a32fc | 153 | packet->wait_queue_token = wq->wait_queue_token; |
70b52a0a JM |
154 | packet->len = wq->name.len; |
155 | memcpy(packet->name, wq->name.name, wq->name.len); | |
156 | packet->name[wq->name.len] = '\0'; | |
5c0a32fc IK |
157 | packet->dev = wq->dev; |
158 | packet->ino = wq->ino; | |
45634cd8 EB |
159 | packet->uid = from_kuid_munged(user_ns, wq->uid); |
160 | packet->gid = from_kgid_munged(user_ns, wq->gid); | |
5c0a32fc IK |
161 | packet->pid = wq->pid; |
162 | packet->tgid = wq->tgid; | |
163 | break; | |
164 | } | |
165 | default: | |
1da177e4 | 166 | printk("autofs4_notify_daemon: bad type %d!\n", type); |
87533332 | 167 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
168 | return; |
169 | } | |
170 | ||
cb0942b8 | 171 | pipe = get_file(sbi->pipe); |
87533332 | 172 | |
e64be33c IK |
173 | mutex_unlock(&sbi->wq_mutex); |
174 | ||
d668dc56 | 175 | if (autofs4_write(sbi, pipe, &pkt, pktsz)) |
87533332 AV |
176 | autofs4_catatonic_mode(sbi); |
177 | fput(pipe); | |
1da177e4 LT |
178 | } |
179 | ||
180 | static int autofs4_getpath(struct autofs_sb_info *sbi, | |
181 | struct dentry *dentry, char **name) | |
182 | { | |
183 | struct dentry *root = sbi->sb->s_root; | |
184 | struct dentry *tmp; | |
949854d0 | 185 | char *buf; |
1da177e4 | 186 | char *p; |
949854d0 NP |
187 | int len; |
188 | unsigned seq; | |
189 | ||
190 | rename_retry: | |
191 | buf = *name; | |
192 | len = 0; | |
b5c84bf6 | 193 | |
949854d0 NP |
194 | seq = read_seqbegin(&rename_lock); |
195 | rcu_read_lock(); | |
e7854723 | 196 | spin_lock(&sbi->fs_lock); |
1da177e4 LT |
197 | for (tmp = dentry ; tmp != root ; tmp = tmp->d_parent) |
198 | len += tmp->d_name.len + 1; | |
199 | ||
cab0936a | 200 | if (!len || --len > NAME_MAX) { |
e7854723 | 201 | spin_unlock(&sbi->fs_lock); |
949854d0 NP |
202 | rcu_read_unlock(); |
203 | if (read_seqretry(&rename_lock, seq)) | |
204 | goto rename_retry; | |
1da177e4 LT |
205 | return 0; |
206 | } | |
207 | ||
208 | *(buf + len) = '\0'; | |
209 | p = buf + len - dentry->d_name.len; | |
210 | strncpy(p, dentry->d_name.name, dentry->d_name.len); | |
211 | ||
212 | for (tmp = dentry->d_parent; tmp != root ; tmp = tmp->d_parent) { | |
213 | *(--p) = '/'; | |
214 | p -= tmp->d_name.len; | |
215 | strncpy(p, tmp->d_name.name, tmp->d_name.len); | |
216 | } | |
e7854723 | 217 | spin_unlock(&sbi->fs_lock); |
949854d0 NP |
218 | rcu_read_unlock(); |
219 | if (read_seqretry(&rename_lock, seq)) | |
220 | goto rename_retry; | |
1da177e4 LT |
221 | |
222 | return len; | |
223 | } | |
224 | ||
a5370553 | 225 | static struct autofs_wait_queue * |
70b52a0a | 226 | autofs4_find_wait(struct autofs_sb_info *sbi, struct qstr *qstr) |
a5370553 IK |
227 | { |
228 | struct autofs_wait_queue *wq; | |
229 | ||
230 | for (wq = sbi->queues; wq; wq = wq->next) { | |
70b52a0a JM |
231 | if (wq->name.hash == qstr->hash && |
232 | wq->name.len == qstr->len && | |
233 | wq->name.name && | |
234 | !memcmp(wq->name.name, qstr->name, qstr->len)) | |
a5370553 IK |
235 | break; |
236 | } | |
237 | return wq; | |
238 | } | |
239 | ||
a1362fe9 IK |
240 | /* |
241 | * Check if we have a valid request. | |
242 | * Returns | |
243 | * 1 if the request should continue. | |
244 | * In this case we can return an autofs_wait_queue entry if one is | |
245 | * found or NULL to idicate a new wait needs to be created. | |
246 | * 0 or a negative errno if the request shouldn't continue. | |
247 | */ | |
248 | static int validate_request(struct autofs_wait_queue **wait, | |
249 | struct autofs_sb_info *sbi, | |
250 | struct qstr *qstr, | |
251 | struct dentry*dentry, enum autofs_notify notify) | |
252 | { | |
253 | struct autofs_wait_queue *wq; | |
254 | struct autofs_info *ino; | |
255 | ||
4041bcdc AV |
256 | if (sbi->catatonic) |
257 | return -ENOENT; | |
258 | ||
a1362fe9 IK |
259 | /* Wait in progress, continue; */ |
260 | wq = autofs4_find_wait(sbi, qstr); | |
261 | if (wq) { | |
262 | *wait = wq; | |
263 | return 1; | |
264 | } | |
265 | ||
266 | *wait = NULL; | |
267 | ||
268 | /* If we don't yet have any info this is a new request */ | |
269 | ino = autofs4_dentry_ino(dentry); | |
270 | if (!ino) | |
271 | return 1; | |
272 | ||
273 | /* | |
274 | * If we've been asked to wait on an existing expire (NFY_NONE) | |
275 | * but there is no wait in the queue ... | |
276 | */ | |
277 | if (notify == NFY_NONE) { | |
278 | /* | |
279 | * Either we've betean the pending expire to post it's | |
280 | * wait or it finished while we waited on the mutex. | |
281 | * So we need to wait till either, the wait appears | |
282 | * or the expire finishes. | |
283 | */ | |
284 | ||
285 | while (ino->flags & AUTOFS_INF_EXPIRING) { | |
286 | mutex_unlock(&sbi->wq_mutex); | |
287 | schedule_timeout_interruptible(HZ/10); | |
288 | if (mutex_lock_interruptible(&sbi->wq_mutex)) | |
289 | return -EINTR; | |
290 | ||
4041bcdc AV |
291 | if (sbi->catatonic) |
292 | return -ENOENT; | |
293 | ||
a1362fe9 IK |
294 | wq = autofs4_find_wait(sbi, qstr); |
295 | if (wq) { | |
296 | *wait = wq; | |
297 | return 1; | |
298 | } | |
299 | } | |
300 | ||
301 | /* | |
302 | * Not ideal but the status has already gone. Of the two | |
303 | * cases where we wait on NFY_NONE neither depend on the | |
304 | * return status of the wait. | |
305 | */ | |
306 | return 0; | |
307 | } | |
308 | ||
309 | /* | |
310 | * If we've been asked to trigger a mount and the request | |
311 | * completed while we waited on the mutex ... | |
312 | */ | |
313 | if (notify == NFY_MOUNT) { | |
9e3fea16 IK |
314 | struct dentry *new = NULL; |
315 | int valid = 1; | |
316 | ||
a1362fe9 | 317 | /* |
463aea1a IK |
318 | * If the dentry was successfully mounted while we slept |
319 | * on the wait queue mutex we can return success. If it | |
320 | * isn't mounted (doesn't have submounts for the case of | |
321 | * a multi-mount with no mount at it's base) we can | |
322 | * continue on and create a new request. | |
323 | */ | |
9e3fea16 IK |
324 | if (!IS_ROOT(dentry)) { |
325 | if (dentry->d_inode && d_unhashed(dentry)) { | |
326 | struct dentry *parent = dentry->d_parent; | |
327 | new = d_lookup(parent, &dentry->d_name); | |
328 | if (new) | |
329 | dentry = new; | |
330 | } | |
331 | } | |
463aea1a | 332 | if (have_submounts(dentry)) |
9e3fea16 IK |
333 | valid = 0; |
334 | ||
335 | if (new) | |
336 | dput(new); | |
337 | return valid; | |
a1362fe9 IK |
338 | } |
339 | ||
340 | return 1; | |
341 | } | |
342 | ||
1da177e4 LT |
343 | int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry, |
344 | enum autofs_notify notify) | |
345 | { | |
346 | struct autofs_wait_queue *wq; | |
70b52a0a | 347 | struct qstr qstr; |
1da177e4 | 348 | char *name; |
a1362fe9 | 349 | int status, ret, type; |
1da177e4 LT |
350 | |
351 | /* In catatonic mode, we don't wait for nobody */ | |
e77fbddf | 352 | if (sbi->catatonic) |
1da177e4 | 353 | return -ENOENT; |
a1362fe9 | 354 | |
c72305b5 IK |
355 | if (!dentry->d_inode) { |
356 | /* | |
357 | * A wait for a negative dentry is invalid for certain | |
358 | * cases. A direct or offset mount "always" has its mount | |
359 | * point directory created and so the request dentry must | |
360 | * be positive or the map key doesn't exist. The situation | |
361 | * is very similar for indirect mounts except only dentrys | |
362 | * in the root of the autofs file system may be negative. | |
363 | */ | |
a92daf6b | 364 | if (autofs_type_trigger(sbi->type)) |
c72305b5 IK |
365 | return -ENOENT; |
366 | else if (!IS_ROOT(dentry->d_parent)) | |
367 | return -ENOENT; | |
368 | } | |
eb3b1767 | 369 | |
1da177e4 LT |
370 | name = kmalloc(NAME_MAX + 1, GFP_KERNEL); |
371 | if (!name) | |
372 | return -ENOMEM; | |
373 | ||
5c0a32fc | 374 | /* If this is a direct mount request create a dummy name */ |
a92daf6b | 375 | if (IS_ROOT(dentry) && autofs_type_trigger(sbi->type)) |
70b52a0a | 376 | qstr.len = sprintf(name, "%p", dentry); |
5c0a32fc | 377 | else { |
70b52a0a JM |
378 | qstr.len = autofs4_getpath(sbi, dentry, &name); |
379 | if (!qstr.len) { | |
5c0a32fc IK |
380 | kfree(name); |
381 | return -ENOENT; | |
382 | } | |
1da177e4 | 383 | } |
70b52a0a JM |
384 | qstr.name = name; |
385 | qstr.hash = full_name_hash(name, qstr.len); | |
1da177e4 | 386 | |
f4c7da02 IK |
387 | if (mutex_lock_interruptible(&sbi->wq_mutex)) { |
388 | kfree(qstr.name); | |
1da177e4 | 389 | return -EINTR; |
f4c7da02 | 390 | } |
a5370553 | 391 | |
a1362fe9 IK |
392 | ret = validate_request(&wq, sbi, &qstr, dentry, notify); |
393 | if (ret <= 0) { | |
4041bcdc | 394 | if (ret != -EINTR) |
1d5599e3 | 395 | mutex_unlock(&sbi->wq_mutex); |
a1362fe9 IK |
396 | kfree(qstr.name); |
397 | return ret; | |
a5370553 | 398 | } |
cc9acc88 | 399 | |
a5370553 | 400 | if (!wq) { |
1da177e4 LT |
401 | /* Create a new wait queue */ |
402 | wq = kmalloc(sizeof(struct autofs_wait_queue),GFP_KERNEL); | |
e77fbddf | 403 | if (!wq) { |
70b52a0a | 404 | kfree(qstr.name); |
1d5599e3 | 405 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
406 | return -ENOMEM; |
407 | } | |
408 | ||
409 | wq->wait_queue_token = autofs4_next_wait_queue; | |
410 | if (++autofs4_next_wait_queue == 0) | |
411 | autofs4_next_wait_queue = 1; | |
412 | wq->next = sbi->queues; | |
413 | sbi->queues = wq; | |
414 | init_waitqueue_head(&wq->queue); | |
70b52a0a | 415 | memcpy(&wq->name, &qstr, sizeof(struct qstr)); |
5c0a32fc IK |
416 | wq->dev = autofs4_get_dev(sbi); |
417 | wq->ino = autofs4_get_ino(sbi); | |
0eb790e3 DH |
418 | wq->uid = current_uid(); |
419 | wq->gid = current_gid(); | |
5c0a32fc IK |
420 | wq->pid = current->pid; |
421 | wq->tgid = current->tgid; | |
1da177e4 | 422 | wq->status = -EINTR; /* Status return if interrupted */ |
296f7bf7 | 423 | wq->wait_ctr = 2; |
3e7b1919 | 424 | |
5c0a32fc IK |
425 | if (sbi->version < 5) { |
426 | if (notify == NFY_MOUNT) | |
427 | type = autofs_ptype_missing; | |
428 | else | |
429 | type = autofs_ptype_expire_multi; | |
430 | } else { | |
431 | if (notify == NFY_MOUNT) | |
a92daf6b | 432 | type = autofs_type_trigger(sbi->type) ? |
5c0a32fc IK |
433 | autofs_ptype_missing_direct : |
434 | autofs_ptype_missing_indirect; | |
435 | else | |
a92daf6b | 436 | type = autofs_type_trigger(sbi->type) ? |
5c0a32fc IK |
437 | autofs_ptype_expire_direct : |
438 | autofs_ptype_expire_indirect; | |
439 | } | |
4dcd00b1 | 440 | |
682d4fc9 | 441 | DPRINTK("new wait id = 0x%08lx, name = %.*s, nfy=%d\n", |
70b52a0a JM |
442 | (unsigned long) wq->wait_queue_token, wq->name.len, |
443 | wq->name.name, notify); | |
4dcd00b1 | 444 | |
606035e7 | 445 | /* autofs4_notify_daemon() may block; it will unlock ->wq_mutex */ |
4dcd00b1 | 446 | autofs4_notify_daemon(sbi, wq, type); |
a5370553 | 447 | } else { |
296f7bf7 | 448 | wq->wait_ctr++; |
a5370553 | 449 | DPRINTK("existing wait id = 0x%08lx, name = %.*s, nfy=%d", |
70b52a0a JM |
450 | (unsigned long) wq->wait_queue_token, wq->name.len, |
451 | wq->name.name, notify); | |
606035e7 AV |
452 | mutex_unlock(&sbi->wq_mutex); |
453 | kfree(qstr.name); | |
4dcd00b1 IK |
454 | } |
455 | ||
5a11d4d0 IK |
456 | /* |
457 | * wq->name.name is NULL iff the lock is already released | |
458 | * or the mount has been made catatonic. | |
459 | */ | |
70b52a0a | 460 | if (wq->name.name) { |
1da177e4 LT |
461 | /* Block all but "shutdown" signals while waiting */ |
462 | sigset_t oldset; | |
463 | unsigned long irqflags; | |
464 | ||
465 | spin_lock_irqsave(¤t->sighand->siglock, irqflags); | |
466 | oldset = current->blocked; | |
467 | siginitsetinv(¤t->blocked, SHUTDOWN_SIGS & ~oldset.sig[0]); | |
468 | recalc_sigpending(); | |
469 | spin_unlock_irqrestore(¤t->sighand->siglock, irqflags); | |
470 | ||
70b52a0a | 471 | wait_event_interruptible(wq->queue, wq->name.name == NULL); |
1da177e4 LT |
472 | |
473 | spin_lock_irqsave(¤t->sighand->siglock, irqflags); | |
474 | current->blocked = oldset; | |
475 | recalc_sigpending(); | |
476 | spin_unlock_irqrestore(¤t->sighand->siglock, irqflags); | |
477 | } else { | |
478 | DPRINTK("skipped sleeping"); | |
479 | } | |
480 | ||
481 | status = wq->status; | |
482 | ||
c0f54d3e IK |
483 | /* |
484 | * For direct and offset mounts we need to track the requester's | |
485 | * uid and gid in the dentry info struct. This is so it can be | |
486 | * supplied, on request, by the misc device ioctl interface. | |
487 | * This is needed during daemon resatart when reconnecting | |
488 | * to existing, active, autofs mounts. The uid and gid (and | |
489 | * related string values) may be used for macro substitution | |
490 | * in autofs mount maps. | |
491 | */ | |
492 | if (!status) { | |
493 | struct autofs_info *ino; | |
494 | struct dentry *de = NULL; | |
495 | ||
496 | /* direct mount or browsable map */ | |
497 | ino = autofs4_dentry_ino(dentry); | |
498 | if (!ino) { | |
499 | /* If not lookup actual dentry used */ | |
500 | de = d_lookup(dentry->d_parent, &dentry->d_name); | |
501 | if (de) | |
502 | ino = autofs4_dentry_ino(de); | |
503 | } | |
504 | ||
505 | /* Set mount requester */ | |
506 | if (ino) { | |
507 | spin_lock(&sbi->fs_lock); | |
508 | ino->uid = wq->uid; | |
509 | ino->gid = wq->gid; | |
510 | spin_unlock(&sbi->fs_lock); | |
511 | } | |
512 | ||
513 | if (de) | |
514 | dput(de); | |
515 | } | |
516 | ||
1da177e4 | 517 | /* Are we the last process to need status? */ |
296f7bf7 IK |
518 | mutex_lock(&sbi->wq_mutex); |
519 | if (!--wq->wait_ctr) | |
1da177e4 | 520 | kfree(wq); |
296f7bf7 | 521 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
522 | |
523 | return status; | |
524 | } | |
525 | ||
526 | ||
527 | int autofs4_wait_release(struct autofs_sb_info *sbi, autofs_wqt_t wait_queue_token, int status) | |
528 | { | |
529 | struct autofs_wait_queue *wq, **wql; | |
530 | ||
1d5599e3 | 531 | mutex_lock(&sbi->wq_mutex); |
c80544dc | 532 | for (wql = &sbi->queues; (wq = *wql) != NULL; wql = &wq->next) { |
e77fbddf | 533 | if (wq->wait_queue_token == wait_queue_token) |
1da177e4 LT |
534 | break; |
535 | } | |
536 | ||
e77fbddf | 537 | if (!wq) { |
1d5599e3 | 538 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
539 | return -EINVAL; |
540 | } | |
541 | ||
542 | *wql = wq->next; /* Unlink from chain */ | |
70b52a0a JM |
543 | kfree(wq->name.name); |
544 | wq->name.name = NULL; /* Do not wait on this queue */ | |
1da177e4 | 545 | wq->status = status; |
296f7bf7 IK |
546 | wake_up_interruptible(&wq->queue); |
547 | if (!--wq->wait_ctr) | |
1da177e4 | 548 | kfree(wq); |
296f7bf7 | 549 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
550 | |
551 | return 0; | |
552 | } | |
553 |