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Commit | Line | Data |
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e9a7c2f1 IK |
1 | /* |
2 | * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved | |
3 | * Copyright 2001-2006 Ian Kent <raven@themaw.net> | |
1da177e4 LT |
4 | * |
5 | * This file is part of the Linux kernel and is made available under | |
6 | * the terms of the GNU General Public License, version 2, or at your | |
7 | * option, any later version, incorporated herein by reference. | |
e9a7c2f1 | 8 | */ |
1da177e4 LT |
9 | |
10 | #include <linux/slab.h> | |
11 | #include <linux/time.h> | |
12 | #include <linux/signal.h> | |
3f07c014 | 13 | #include <linux/sched/signal.h> |
1da177e4 LT |
14 | #include <linux/file.h> |
15 | #include "autofs_i.h" | |
16 | ||
17 | /* We make this a static variable rather than a part of the superblock; it | |
e9a7c2f1 IK |
18 | * is better if we don't reassign numbers easily even across filesystems |
19 | */ | |
1da177e4 LT |
20 | static autofs_wqt_t autofs4_next_wait_queue = 1; |
21 | ||
22 | /* These are the signals we allow interrupting a pending mount */ | |
23 | #define SHUTDOWN_SIGS (sigmask(SIGKILL) | sigmask(SIGINT) | sigmask(SIGQUIT)) | |
24 | ||
25 | void autofs4_catatonic_mode(struct autofs_sb_info *sbi) | |
26 | { | |
27 | struct autofs_wait_queue *wq, *nwq; | |
28 | ||
5a11d4d0 IK |
29 | mutex_lock(&sbi->wq_mutex); |
30 | if (sbi->catatonic) { | |
31 | mutex_unlock(&sbi->wq_mutex); | |
32 | return; | |
33 | } | |
34 | ||
8a78d593 | 35 | pr_debug("entering catatonic mode\n"); |
1da177e4 LT |
36 | |
37 | sbi->catatonic = 1; | |
38 | wq = sbi->queues; | |
39 | sbi->queues = NULL; /* Erase all wait queues */ | |
e77fbddf | 40 | while (wq) { |
1da177e4 LT |
41 | nwq = wq->next; |
42 | wq->status = -ENOENT; /* Magic is gone - report failure */ | |
5140a8ce TG |
43 | kfree(wq->name.name); |
44 | wq->name.name = NULL; | |
296f7bf7 | 45 | wq->wait_ctr--; |
1da177e4 LT |
46 | wake_up_interruptible(&wq->queue); |
47 | wq = nwq; | |
48 | } | |
ba8df43c IK |
49 | fput(sbi->pipe); /* Close the pipe */ |
50 | sbi->pipe = NULL; | |
5a11d4d0 IK |
51 | sbi->pipefd = -1; |
52 | mutex_unlock(&sbi->wq_mutex); | |
1da177e4 LT |
53 | } |
54 | ||
d668dc56 AV |
55 | static int autofs4_write(struct autofs_sb_info *sbi, |
56 | struct file *file, const void *addr, int bytes) | |
1da177e4 LT |
57 | { |
58 | unsigned long sigpipe, flags; | |
1da177e4 LT |
59 | const char *data = (const char *)addr; |
60 | ssize_t wr = 0; | |
61 | ||
1da177e4 LT |
62 | sigpipe = sigismember(¤t->pending.signal, SIGPIPE); |
63 | ||
d668dc56 | 64 | mutex_lock(&sbi->pipe_mutex); |
5a9294e5 | 65 | while (bytes) { |
317d5a5f | 66 | wr = __kernel_write(file, data, bytes, &file->f_pos); |
5a9294e5 AV |
67 | if (wr <= 0) |
68 | break; | |
1da177e4 LT |
69 | data += wr; |
70 | bytes -= wr; | |
71 | } | |
8638094e | 72 | mutex_unlock(&sbi->pipe_mutex); |
1da177e4 | 73 | |
1da177e4 | 74 | /* Keep the currently executing process from receiving a |
e9a7c2f1 IK |
75 | * SIGPIPE unless it was already supposed to get one |
76 | */ | |
1da177e4 LT |
77 | if (wr == -EPIPE && !sigpipe) { |
78 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
79 | sigdelset(¤t->pending.signal, SIGPIPE); | |
80 | recalc_sigpending(); | |
81 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
82 | } | |
83 | ||
84 | return (bytes > 0); | |
85 | } | |
0266725a | 86 | |
1da177e4 LT |
87 | static void autofs4_notify_daemon(struct autofs_sb_info *sbi, |
88 | struct autofs_wait_queue *wq, | |
89 | int type) | |
90 | { | |
e8514478 IK |
91 | union { |
92 | struct autofs_packet_hdr hdr; | |
93 | union autofs_packet_union v4_pkt; | |
94 | union autofs_v5_packet_union v5_pkt; | |
95 | } pkt; | |
e64be33c | 96 | struct file *pipe = NULL; |
1da177e4 LT |
97 | size_t pktsz; |
98 | ||
8a78d593 | 99 | pr_debug("wait id = 0x%08lx, name = %.*s, type=%d\n", |
7cee9384 | 100 | (unsigned long) wq->wait_queue_token, |
8a78d593 | 101 | wq->name.len, wq->name.name, type); |
1da177e4 | 102 | |
e9a7c2f1 | 103 | memset(&pkt, 0, sizeof(pkt)); /* For security reasons */ |
1da177e4 LT |
104 | |
105 | pkt.hdr.proto_version = sbi->version; | |
106 | pkt.hdr.type = type; | |
87533332 | 107 | |
5c0a32fc IK |
108 | switch (type) { |
109 | /* Kernel protocol v4 missing and expire packets */ | |
110 | case autofs_ptype_missing: | |
111 | { | |
e8514478 | 112 | struct autofs_packet_missing *mp = &pkt.v4_pkt.missing; |
1da177e4 LT |
113 | |
114 | pktsz = sizeof(*mp); | |
115 | ||
7cee9384 | 116 | mp->wait_queue_token = wq->wait_queue_token; |
70b52a0a JM |
117 | mp->len = wq->name.len; |
118 | memcpy(mp->name, wq->name.name, wq->name.len); | |
119 | mp->name[wq->name.len] = '\0'; | |
5c0a32fc IK |
120 | break; |
121 | } | |
122 | case autofs_ptype_expire_multi: | |
123 | { | |
e9a7c2f1 IK |
124 | struct autofs_packet_expire_multi *ep = |
125 | &pkt.v4_pkt.expire_multi; | |
1da177e4 LT |
126 | |
127 | pktsz = sizeof(*ep); | |
128 | ||
7cee9384 | 129 | ep->wait_queue_token = wq->wait_queue_token; |
70b52a0a JM |
130 | ep->len = wq->name.len; |
131 | memcpy(ep->name, wq->name.name, wq->name.len); | |
132 | ep->name[wq->name.len] = '\0'; | |
5c0a32fc IK |
133 | break; |
134 | } | |
135 | /* | |
136 | * Kernel protocol v5 packet for handling indirect and direct | |
137 | * mount missing and expire requests | |
138 | */ | |
139 | case autofs_ptype_missing_indirect: | |
140 | case autofs_ptype_expire_indirect: | |
141 | case autofs_ptype_missing_direct: | |
142 | case autofs_ptype_expire_direct: | |
143 | { | |
e8514478 | 144 | struct autofs_v5_packet *packet = &pkt.v5_pkt.v5_packet; |
45634cd8 | 145 | struct user_namespace *user_ns = sbi->pipe->f_cred->user_ns; |
5c0a32fc | 146 | |
fcbf94b9 LT |
147 | pktsz = sizeof(*packet); |
148 | ||
7cee9384 | 149 | packet->wait_queue_token = wq->wait_queue_token; |
70b52a0a JM |
150 | packet->len = wq->name.len; |
151 | memcpy(packet->name, wq->name.name, wq->name.len); | |
152 | packet->name[wq->name.len] = '\0'; | |
5c0a32fc IK |
153 | packet->dev = wq->dev; |
154 | packet->ino = wq->ino; | |
45634cd8 EB |
155 | packet->uid = from_kuid_munged(user_ns, wq->uid); |
156 | packet->gid = from_kgid_munged(user_ns, wq->gid); | |
5c0a32fc IK |
157 | packet->pid = wq->pid; |
158 | packet->tgid = wq->tgid; | |
159 | break; | |
160 | } | |
161 | default: | |
8a78d593 | 162 | pr_warn("bad type %d!\n", type); |
87533332 | 163 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
164 | return; |
165 | } | |
166 | ||
cb0942b8 | 167 | pipe = get_file(sbi->pipe); |
87533332 | 168 | |
e64be33c IK |
169 | mutex_unlock(&sbi->wq_mutex); |
170 | ||
d668dc56 | 171 | if (autofs4_write(sbi, pipe, &pkt, pktsz)) |
87533332 AV |
172 | autofs4_catatonic_mode(sbi); |
173 | fput(pipe); | |
1da177e4 LT |
174 | } |
175 | ||
176 | static int autofs4_getpath(struct autofs_sb_info *sbi, | |
177 | struct dentry *dentry, char **name) | |
178 | { | |
179 | struct dentry *root = sbi->sb->s_root; | |
180 | struct dentry *tmp; | |
949854d0 | 181 | char *buf; |
1da177e4 | 182 | char *p; |
949854d0 NP |
183 | int len; |
184 | unsigned seq; | |
185 | ||
186 | rename_retry: | |
187 | buf = *name; | |
188 | len = 0; | |
b5c84bf6 | 189 | |
949854d0 NP |
190 | seq = read_seqbegin(&rename_lock); |
191 | rcu_read_lock(); | |
e7854723 | 192 | spin_lock(&sbi->fs_lock); |
1da177e4 LT |
193 | for (tmp = dentry ; tmp != root ; tmp = tmp->d_parent) |
194 | len += tmp->d_name.len + 1; | |
195 | ||
cab0936a | 196 | if (!len || --len > NAME_MAX) { |
e7854723 | 197 | spin_unlock(&sbi->fs_lock); |
949854d0 NP |
198 | rcu_read_unlock(); |
199 | if (read_seqretry(&rename_lock, seq)) | |
200 | goto rename_retry; | |
1da177e4 LT |
201 | return 0; |
202 | } | |
203 | ||
204 | *(buf + len) = '\0'; | |
205 | p = buf + len - dentry->d_name.len; | |
206 | strncpy(p, dentry->d_name.name, dentry->d_name.len); | |
207 | ||
208 | for (tmp = dentry->d_parent; tmp != root ; tmp = tmp->d_parent) { | |
209 | *(--p) = '/'; | |
210 | p -= tmp->d_name.len; | |
211 | strncpy(p, tmp->d_name.name, tmp->d_name.len); | |
212 | } | |
e7854723 | 213 | spin_unlock(&sbi->fs_lock); |
949854d0 NP |
214 | rcu_read_unlock(); |
215 | if (read_seqretry(&rename_lock, seq)) | |
216 | goto rename_retry; | |
1da177e4 LT |
217 | |
218 | return len; | |
219 | } | |
220 | ||
a5370553 | 221 | static struct autofs_wait_queue * |
8ac790f3 | 222 | autofs4_find_wait(struct autofs_sb_info *sbi, const struct qstr *qstr) |
a5370553 IK |
223 | { |
224 | struct autofs_wait_queue *wq; | |
225 | ||
226 | for (wq = sbi->queues; wq; wq = wq->next) { | |
70b52a0a JM |
227 | if (wq->name.hash == qstr->hash && |
228 | wq->name.len == qstr->len && | |
229 | wq->name.name && | |
e9a7c2f1 | 230 | !memcmp(wq->name.name, qstr->name, qstr->len)) |
a5370553 IK |
231 | break; |
232 | } | |
233 | return wq; | |
234 | } | |
235 | ||
a1362fe9 IK |
236 | /* |
237 | * Check if we have a valid request. | |
238 | * Returns | |
239 | * 1 if the request should continue. | |
240 | * In this case we can return an autofs_wait_queue entry if one is | |
241 | * found or NULL to idicate a new wait needs to be created. | |
242 | * 0 or a negative errno if the request shouldn't continue. | |
243 | */ | |
244 | static int validate_request(struct autofs_wait_queue **wait, | |
245 | struct autofs_sb_info *sbi, | |
8ac790f3 | 246 | const struct qstr *qstr, |
60359741 | 247 | const struct path *path, enum autofs_notify notify) |
a1362fe9 | 248 | { |
60359741 | 249 | struct dentry *dentry = path->dentry; |
a1362fe9 IK |
250 | struct autofs_wait_queue *wq; |
251 | struct autofs_info *ino; | |
252 | ||
4041bcdc AV |
253 | if (sbi->catatonic) |
254 | return -ENOENT; | |
255 | ||
a1362fe9 IK |
256 | /* Wait in progress, continue; */ |
257 | wq = autofs4_find_wait(sbi, qstr); | |
258 | if (wq) { | |
259 | *wait = wq; | |
260 | return 1; | |
261 | } | |
262 | ||
263 | *wait = NULL; | |
264 | ||
265 | /* If we don't yet have any info this is a new request */ | |
266 | ino = autofs4_dentry_ino(dentry); | |
267 | if (!ino) | |
268 | return 1; | |
269 | ||
270 | /* | |
271 | * If we've been asked to wait on an existing expire (NFY_NONE) | |
272 | * but there is no wait in the queue ... | |
273 | */ | |
274 | if (notify == NFY_NONE) { | |
275 | /* | |
276 | * Either we've betean the pending expire to post it's | |
277 | * wait or it finished while we waited on the mutex. | |
278 | * So we need to wait till either, the wait appears | |
279 | * or the expire finishes. | |
280 | */ | |
281 | ||
282 | while (ino->flags & AUTOFS_INF_EXPIRING) { | |
283 | mutex_unlock(&sbi->wq_mutex); | |
284 | schedule_timeout_interruptible(HZ/10); | |
285 | if (mutex_lock_interruptible(&sbi->wq_mutex)) | |
286 | return -EINTR; | |
287 | ||
4041bcdc AV |
288 | if (sbi->catatonic) |
289 | return -ENOENT; | |
290 | ||
a1362fe9 IK |
291 | wq = autofs4_find_wait(sbi, qstr); |
292 | if (wq) { | |
293 | *wait = wq; | |
294 | return 1; | |
295 | } | |
296 | } | |
297 | ||
298 | /* | |
299 | * Not ideal but the status has already gone. Of the two | |
300 | * cases where we wait on NFY_NONE neither depend on the | |
301 | * return status of the wait. | |
302 | */ | |
303 | return 0; | |
304 | } | |
305 | ||
306 | /* | |
307 | * If we've been asked to trigger a mount and the request | |
308 | * completed while we waited on the mutex ... | |
309 | */ | |
310 | if (notify == NFY_MOUNT) { | |
9e3fea16 | 311 | struct dentry *new = NULL; |
60359741 | 312 | struct path this; |
9e3fea16 IK |
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 | 322 | if (!IS_ROOT(dentry)) { |
e9a7c2f1 IK |
323 | if (d_unhashed(dentry) && |
324 | d_really_is_positive(dentry)) { | |
9e3fea16 | 325 | struct dentry *parent = dentry->d_parent; |
e9a7c2f1 | 326 | |
9e3fea16 IK |
327 | new = d_lookup(parent, &dentry->d_name); |
328 | if (new) | |
329 | dentry = new; | |
330 | } | |
331 | } | |
60359741 IK |
332 | this.mnt = path->mnt; |
333 | this.dentry = dentry; | |
334 | if (path_has_submounts(&this)) | |
9e3fea16 IK |
335 | valid = 0; |
336 | ||
337 | if (new) | |
338 | dput(new); | |
339 | return valid; | |
a1362fe9 IK |
340 | } |
341 | ||
342 | return 1; | |
343 | } | |
344 | ||
e9a7c2f1 | 345 | int autofs4_wait(struct autofs_sb_info *sbi, |
dd36a882 | 346 | const struct path *path, enum autofs_notify notify) |
1da177e4 | 347 | { |
dd36a882 | 348 | struct dentry *dentry = path->dentry; |
1da177e4 | 349 | struct autofs_wait_queue *wq; |
70b52a0a | 350 | struct qstr qstr; |
1da177e4 | 351 | char *name; |
a1362fe9 | 352 | int status, ret, type; |
fbff0870 MS |
353 | pid_t pid; |
354 | pid_t tgid; | |
1da177e4 LT |
355 | |
356 | /* In catatonic mode, we don't wait for nobody */ | |
e77fbddf | 357 | if (sbi->catatonic) |
1da177e4 | 358 | return -ENOENT; |
a1362fe9 | 359 | |
fbff0870 MS |
360 | /* |
361 | * Try translating pids to the namespace of the daemon. | |
362 | * | |
363 | * Zero means failure: we are in an unrelated pid namespace. | |
364 | */ | |
365 | pid = task_pid_nr_ns(current, ns_of_pid(sbi->oz_pgrp)); | |
366 | tgid = task_tgid_nr_ns(current, ns_of_pid(sbi->oz_pgrp)); | |
367 | if (pid == 0 || tgid == 0) | |
368 | return -ENOENT; | |
369 | ||
2b0143b5 | 370 | if (d_really_is_negative(dentry)) { |
c72305b5 IK |
371 | /* |
372 | * A wait for a negative dentry is invalid for certain | |
373 | * cases. A direct or offset mount "always" has its mount | |
374 | * point directory created and so the request dentry must | |
375 | * be positive or the map key doesn't exist. The situation | |
376 | * is very similar for indirect mounts except only dentrys | |
377 | * in the root of the autofs file system may be negative. | |
378 | */ | |
a92daf6b | 379 | if (autofs_type_trigger(sbi->type)) |
c72305b5 IK |
380 | return -ENOENT; |
381 | else if (!IS_ROOT(dentry->d_parent)) | |
382 | return -ENOENT; | |
383 | } | |
eb3b1767 | 384 | |
1da177e4 LT |
385 | name = kmalloc(NAME_MAX + 1, GFP_KERNEL); |
386 | if (!name) | |
387 | return -ENOMEM; | |
388 | ||
5c0a32fc | 389 | /* If this is a direct mount request create a dummy name */ |
a92daf6b | 390 | if (IS_ROOT(dentry) && autofs_type_trigger(sbi->type)) |
70b52a0a | 391 | qstr.len = sprintf(name, "%p", dentry); |
5c0a32fc | 392 | else { |
70b52a0a JM |
393 | qstr.len = autofs4_getpath(sbi, dentry, &name); |
394 | if (!qstr.len) { | |
5c0a32fc IK |
395 | kfree(name); |
396 | return -ENOENT; | |
397 | } | |
1da177e4 | 398 | } |
70b52a0a | 399 | qstr.name = name; |
8387ff25 | 400 | qstr.hash = full_name_hash(dentry, name, qstr.len); |
1da177e4 | 401 | |
f4c7da02 IK |
402 | if (mutex_lock_interruptible(&sbi->wq_mutex)) { |
403 | kfree(qstr.name); | |
1da177e4 | 404 | return -EINTR; |
f4c7da02 | 405 | } |
a5370553 | 406 | |
60359741 | 407 | ret = validate_request(&wq, sbi, &qstr, path, notify); |
a1362fe9 | 408 | if (ret <= 0) { |
4041bcdc | 409 | if (ret != -EINTR) |
1d5599e3 | 410 | mutex_unlock(&sbi->wq_mutex); |
a1362fe9 IK |
411 | kfree(qstr.name); |
412 | return ret; | |
a5370553 | 413 | } |
cc9acc88 | 414 | |
a5370553 | 415 | if (!wq) { |
1da177e4 | 416 | /* Create a new wait queue */ |
e9a7c2f1 | 417 | wq = kmalloc(sizeof(struct autofs_wait_queue), GFP_KERNEL); |
e77fbddf | 418 | if (!wq) { |
70b52a0a | 419 | kfree(qstr.name); |
1d5599e3 | 420 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
421 | return -ENOMEM; |
422 | } | |
423 | ||
7cee9384 | 424 | wq->wait_queue_token = autofs4_next_wait_queue; |
1da177e4 LT |
425 | if (++autofs4_next_wait_queue == 0) |
426 | autofs4_next_wait_queue = 1; | |
427 | wq->next = sbi->queues; | |
428 | sbi->queues = wq; | |
429 | init_waitqueue_head(&wq->queue); | |
70b52a0a | 430 | memcpy(&wq->name, &qstr, sizeof(struct qstr)); |
5c0a32fc IK |
431 | wq->dev = autofs4_get_dev(sbi); |
432 | wq->ino = autofs4_get_ino(sbi); | |
93faccbb EB |
433 | wq->uid = current_cred()->uid; |
434 | wq->gid = current_cred()->gid; | |
fbff0870 MS |
435 | wq->pid = pid; |
436 | wq->tgid = tgid; | |
1da177e4 | 437 | wq->status = -EINTR; /* Status return if interrupted */ |
296f7bf7 | 438 | wq->wait_ctr = 2; |
3e7b1919 | 439 | |
5c0a32fc IK |
440 | if (sbi->version < 5) { |
441 | if (notify == NFY_MOUNT) | |
442 | type = autofs_ptype_missing; | |
443 | else | |
444 | type = autofs_ptype_expire_multi; | |
445 | } else { | |
446 | if (notify == NFY_MOUNT) | |
a92daf6b | 447 | type = autofs_type_trigger(sbi->type) ? |
5c0a32fc IK |
448 | autofs_ptype_missing_direct : |
449 | autofs_ptype_missing_indirect; | |
450 | else | |
a92daf6b | 451 | type = autofs_type_trigger(sbi->type) ? |
5c0a32fc IK |
452 | autofs_ptype_expire_direct : |
453 | autofs_ptype_expire_indirect; | |
454 | } | |
4dcd00b1 | 455 | |
8a78d593 | 456 | pr_debug("new wait id = 0x%08lx, name = %.*s, nfy=%d\n", |
7cee9384 | 457 | (unsigned long) wq->wait_queue_token, wq->name.len, |
8a78d593 | 458 | wq->name.name, notify); |
4dcd00b1 | 459 | |
e9a7c2f1 IK |
460 | /* |
461 | * autofs4_notify_daemon() may block; it will unlock ->wq_mutex | |
462 | */ | |
4dcd00b1 | 463 | autofs4_notify_daemon(sbi, wq, type); |
a5370553 | 464 | } else { |
296f7bf7 | 465 | wq->wait_ctr++; |
8a78d593 | 466 | pr_debug("existing wait id = 0x%08lx, name = %.*s, nfy=%d\n", |
7cee9384 | 467 | (unsigned long) wq->wait_queue_token, wq->name.len, |
8a78d593 | 468 | wq->name.name, notify); |
606035e7 AV |
469 | mutex_unlock(&sbi->wq_mutex); |
470 | kfree(qstr.name); | |
4dcd00b1 IK |
471 | } |
472 | ||
5a11d4d0 IK |
473 | /* |
474 | * wq->name.name is NULL iff the lock is already released | |
475 | * or the mount has been made catatonic. | |
476 | */ | |
70b52a0a | 477 | if (wq->name.name) { |
1da177e4 | 478 | /* Block all but "shutdown" signals while waiting */ |
b3f67a98 | 479 | unsigned long shutdown_sigs_mask; |
1da177e4 | 480 | unsigned long irqflags; |
b3f67a98 | 481 | sigset_t oldset; |
1da177e4 LT |
482 | |
483 | spin_lock_irqsave(¤t->sighand->siglock, irqflags); | |
484 | oldset = current->blocked; | |
b3f67a98 IK |
485 | shutdown_sigs_mask = SHUTDOWN_SIGS & ~oldset.sig[0]; |
486 | siginitsetinv(¤t->blocked, shutdown_sigs_mask); | |
1da177e4 LT |
487 | recalc_sigpending(); |
488 | spin_unlock_irqrestore(¤t->sighand->siglock, irqflags); | |
489 | ||
70b52a0a | 490 | wait_event_interruptible(wq->queue, wq->name.name == NULL); |
1da177e4 LT |
491 | |
492 | spin_lock_irqsave(¤t->sighand->siglock, irqflags); | |
493 | current->blocked = oldset; | |
494 | recalc_sigpending(); | |
495 | spin_unlock_irqrestore(¤t->sighand->siglock, irqflags); | |
496 | } else { | |
8a78d593 | 497 | pr_debug("skipped sleeping\n"); |
1da177e4 LT |
498 | } |
499 | ||
500 | status = wq->status; | |
501 | ||
c0f54d3e IK |
502 | /* |
503 | * For direct and offset mounts we need to track the requester's | |
504 | * uid and gid in the dentry info struct. This is so it can be | |
505 | * supplied, on request, by the misc device ioctl interface. | |
506 | * This is needed during daemon resatart when reconnecting | |
507 | * to existing, active, autofs mounts. The uid and gid (and | |
508 | * related string values) may be used for macro substitution | |
509 | * in autofs mount maps. | |
510 | */ | |
511 | if (!status) { | |
512 | struct autofs_info *ino; | |
513 | struct dentry *de = NULL; | |
514 | ||
515 | /* direct mount or browsable map */ | |
516 | ino = autofs4_dentry_ino(dentry); | |
517 | if (!ino) { | |
518 | /* If not lookup actual dentry used */ | |
519 | de = d_lookup(dentry->d_parent, &dentry->d_name); | |
520 | if (de) | |
521 | ino = autofs4_dentry_ino(de); | |
522 | } | |
523 | ||
524 | /* Set mount requester */ | |
525 | if (ino) { | |
526 | spin_lock(&sbi->fs_lock); | |
527 | ino->uid = wq->uid; | |
528 | ino->gid = wq->gid; | |
529 | spin_unlock(&sbi->fs_lock); | |
530 | } | |
531 | ||
532 | if (de) | |
533 | dput(de); | |
534 | } | |
535 | ||
1da177e4 | 536 | /* Are we the last process to need status? */ |
296f7bf7 IK |
537 | mutex_lock(&sbi->wq_mutex); |
538 | if (!--wq->wait_ctr) | |
1da177e4 | 539 | kfree(wq); |
296f7bf7 | 540 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
541 | |
542 | return status; | |
543 | } | |
544 | ||
545 | ||
7cee9384 | 546 | int autofs4_wait_release(struct autofs_sb_info *sbi, autofs_wqt_t wait_queue_token, int status) |
1da177e4 LT |
547 | { |
548 | struct autofs_wait_queue *wq, **wql; | |
549 | ||
1d5599e3 | 550 | mutex_lock(&sbi->wq_mutex); |
c80544dc | 551 | for (wql = &sbi->queues; (wq = *wql) != NULL; wql = &wq->next) { |
7cee9384 | 552 | if (wq->wait_queue_token == wait_queue_token) |
1da177e4 LT |
553 | break; |
554 | } | |
555 | ||
e77fbddf | 556 | if (!wq) { |
1d5599e3 | 557 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
558 | return -EINVAL; |
559 | } | |
560 | ||
561 | *wql = wq->next; /* Unlink from chain */ | |
70b52a0a JM |
562 | kfree(wq->name.name); |
563 | wq->name.name = NULL; /* Do not wait on this queue */ | |
1da177e4 | 564 | wq->status = status; |
296f7bf7 IK |
565 | wake_up_interruptible(&wq->queue); |
566 | if (!--wq->wait_ctr) | |
1da177e4 | 567 | kfree(wq); |
296f7bf7 | 568 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
569 | |
570 | return 0; | |
571 | } |