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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; | |
59 | mm_segment_t fs; | |
60 | const char *data = (const char *)addr; | |
61 | ssize_t wr = 0; | |
62 | ||
1da177e4 LT |
63 | sigpipe = sigismember(¤t->pending.signal, SIGPIPE); |
64 | ||
65 | /* Save pointer to user space and point back to kernel space */ | |
66 | fs = get_fs(); | |
67 | set_fs(KERNEL_DS); | |
68 | ||
d668dc56 | 69 | mutex_lock(&sbi->pipe_mutex); |
5a9294e5 AV |
70 | while (bytes) { |
71 | wr = __vfs_write(file, data, bytes, &file->f_pos); | |
72 | if (wr <= 0) | |
73 | break; | |
1da177e4 LT |
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 | |
e9a7c2f1 IK |
82 | * SIGPIPE unless it was already supposed to get one |
83 | */ | |
1da177e4 LT |
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 | } | |
0266725a | 93 | |
1da177e4 LT |
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 | ||
8a78d593 IK |
106 | pr_debug("wait id = 0x%08lx, name = %.*s, type=%d\n", |
107 | (unsigned long) wq->wait_queue_token, | |
108 | wq->name.len, wq->name.name, type); | |
1da177e4 | 109 | |
e9a7c2f1 | 110 | memset(&pkt, 0, sizeof(pkt)); /* For security reasons */ |
1da177e4 LT |
111 | |
112 | pkt.hdr.proto_version = sbi->version; | |
113 | pkt.hdr.type = type; | |
87533332 | 114 | |
5c0a32fc IK |
115 | switch (type) { |
116 | /* Kernel protocol v4 missing and expire packets */ | |
117 | case autofs_ptype_missing: | |
118 | { | |
e8514478 | 119 | struct autofs_packet_missing *mp = &pkt.v4_pkt.missing; |
1da177e4 LT |
120 | |
121 | pktsz = sizeof(*mp); | |
122 | ||
123 | mp->wait_queue_token = wq->wait_queue_token; | |
70b52a0a JM |
124 | mp->len = wq->name.len; |
125 | memcpy(mp->name, wq->name.name, wq->name.len); | |
126 | mp->name[wq->name.len] = '\0'; | |
5c0a32fc IK |
127 | break; |
128 | } | |
129 | case autofs_ptype_expire_multi: | |
130 | { | |
e9a7c2f1 IK |
131 | struct autofs_packet_expire_multi *ep = |
132 | &pkt.v4_pkt.expire_multi; | |
1da177e4 LT |
133 | |
134 | pktsz = sizeof(*ep); | |
135 | ||
136 | ep->wait_queue_token = wq->wait_queue_token; | |
70b52a0a JM |
137 | ep->len = wq->name.len; |
138 | memcpy(ep->name, wq->name.name, wq->name.len); | |
139 | ep->name[wq->name.len] = '\0'; | |
5c0a32fc IK |
140 | break; |
141 | } | |
142 | /* | |
143 | * Kernel protocol v5 packet for handling indirect and direct | |
144 | * mount missing and expire requests | |
145 | */ | |
146 | case autofs_ptype_missing_indirect: | |
147 | case autofs_ptype_expire_indirect: | |
148 | case autofs_ptype_missing_direct: | |
149 | case autofs_ptype_expire_direct: | |
150 | { | |
e8514478 | 151 | struct autofs_v5_packet *packet = &pkt.v5_pkt.v5_packet; |
45634cd8 | 152 | struct user_namespace *user_ns = sbi->pipe->f_cred->user_ns; |
5c0a32fc | 153 | |
fcbf94b9 LT |
154 | pktsz = sizeof(*packet); |
155 | ||
5c0a32fc | 156 | packet->wait_queue_token = wq->wait_queue_token; |
70b52a0a JM |
157 | packet->len = wq->name.len; |
158 | memcpy(packet->name, wq->name.name, wq->name.len); | |
159 | packet->name[wq->name.len] = '\0'; | |
5c0a32fc IK |
160 | packet->dev = wq->dev; |
161 | packet->ino = wq->ino; | |
45634cd8 EB |
162 | packet->uid = from_kuid_munged(user_ns, wq->uid); |
163 | packet->gid = from_kgid_munged(user_ns, wq->gid); | |
5c0a32fc IK |
164 | packet->pid = wq->pid; |
165 | packet->tgid = wq->tgid; | |
166 | break; | |
167 | } | |
168 | default: | |
8a78d593 | 169 | pr_warn("bad type %d!\n", type); |
87533332 | 170 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
171 | return; |
172 | } | |
173 | ||
cb0942b8 | 174 | pipe = get_file(sbi->pipe); |
87533332 | 175 | |
e64be33c IK |
176 | mutex_unlock(&sbi->wq_mutex); |
177 | ||
d668dc56 | 178 | if (autofs4_write(sbi, pipe, &pkt, pktsz)) |
87533332 AV |
179 | autofs4_catatonic_mode(sbi); |
180 | fput(pipe); | |
1da177e4 LT |
181 | } |
182 | ||
183 | static int autofs4_getpath(struct autofs_sb_info *sbi, | |
184 | struct dentry *dentry, char **name) | |
185 | { | |
186 | struct dentry *root = sbi->sb->s_root; | |
187 | struct dentry *tmp; | |
949854d0 | 188 | char *buf; |
1da177e4 | 189 | char *p; |
949854d0 NP |
190 | int len; |
191 | unsigned seq; | |
192 | ||
193 | rename_retry: | |
194 | buf = *name; | |
195 | len = 0; | |
b5c84bf6 | 196 | |
949854d0 NP |
197 | seq = read_seqbegin(&rename_lock); |
198 | rcu_read_lock(); | |
e7854723 | 199 | spin_lock(&sbi->fs_lock); |
1da177e4 LT |
200 | for (tmp = dentry ; tmp != root ; tmp = tmp->d_parent) |
201 | len += tmp->d_name.len + 1; | |
202 | ||
cab0936a | 203 | if (!len || --len > NAME_MAX) { |
e7854723 | 204 | spin_unlock(&sbi->fs_lock); |
949854d0 NP |
205 | rcu_read_unlock(); |
206 | if (read_seqretry(&rename_lock, seq)) | |
207 | goto rename_retry; | |
1da177e4 LT |
208 | return 0; |
209 | } | |
210 | ||
211 | *(buf + len) = '\0'; | |
212 | p = buf + len - dentry->d_name.len; | |
213 | strncpy(p, dentry->d_name.name, dentry->d_name.len); | |
214 | ||
215 | for (tmp = dentry->d_parent; tmp != root ; tmp = tmp->d_parent) { | |
216 | *(--p) = '/'; | |
217 | p -= tmp->d_name.len; | |
218 | strncpy(p, tmp->d_name.name, tmp->d_name.len); | |
219 | } | |
e7854723 | 220 | spin_unlock(&sbi->fs_lock); |
949854d0 NP |
221 | rcu_read_unlock(); |
222 | if (read_seqretry(&rename_lock, seq)) | |
223 | goto rename_retry; | |
1da177e4 LT |
224 | |
225 | return len; | |
226 | } | |
227 | ||
a5370553 | 228 | static struct autofs_wait_queue * |
8ac790f3 | 229 | autofs4_find_wait(struct autofs_sb_info *sbi, const struct qstr *qstr) |
a5370553 IK |
230 | { |
231 | struct autofs_wait_queue *wq; | |
232 | ||
233 | for (wq = sbi->queues; wq; wq = wq->next) { | |
70b52a0a JM |
234 | if (wq->name.hash == qstr->hash && |
235 | wq->name.len == qstr->len && | |
236 | wq->name.name && | |
e9a7c2f1 | 237 | !memcmp(wq->name.name, qstr->name, qstr->len)) |
a5370553 IK |
238 | break; |
239 | } | |
240 | return wq; | |
241 | } | |
242 | ||
a1362fe9 IK |
243 | /* |
244 | * Check if we have a valid request. | |
245 | * Returns | |
246 | * 1 if the request should continue. | |
247 | * In this case we can return an autofs_wait_queue entry if one is | |
248 | * found or NULL to idicate a new wait needs to be created. | |
249 | * 0 or a negative errno if the request shouldn't continue. | |
250 | */ | |
251 | static int validate_request(struct autofs_wait_queue **wait, | |
252 | struct autofs_sb_info *sbi, | |
8ac790f3 | 253 | const struct qstr *qstr, |
60359741 | 254 | const struct path *path, enum autofs_notify notify) |
a1362fe9 | 255 | { |
60359741 | 256 | struct dentry *dentry = path->dentry; |
a1362fe9 IK |
257 | struct autofs_wait_queue *wq; |
258 | struct autofs_info *ino; | |
259 | ||
4041bcdc AV |
260 | if (sbi->catatonic) |
261 | return -ENOENT; | |
262 | ||
a1362fe9 IK |
263 | /* Wait in progress, continue; */ |
264 | wq = autofs4_find_wait(sbi, qstr); | |
265 | if (wq) { | |
266 | *wait = wq; | |
267 | return 1; | |
268 | } | |
269 | ||
270 | *wait = NULL; | |
271 | ||
272 | /* If we don't yet have any info this is a new request */ | |
273 | ino = autofs4_dentry_ino(dentry); | |
274 | if (!ino) | |
275 | return 1; | |
276 | ||
277 | /* | |
278 | * If we've been asked to wait on an existing expire (NFY_NONE) | |
279 | * but there is no wait in the queue ... | |
280 | */ | |
281 | if (notify == NFY_NONE) { | |
282 | /* | |
283 | * Either we've betean the pending expire to post it's | |
284 | * wait or it finished while we waited on the mutex. | |
285 | * So we need to wait till either, the wait appears | |
286 | * or the expire finishes. | |
287 | */ | |
288 | ||
289 | while (ino->flags & AUTOFS_INF_EXPIRING) { | |
290 | mutex_unlock(&sbi->wq_mutex); | |
291 | schedule_timeout_interruptible(HZ/10); | |
292 | if (mutex_lock_interruptible(&sbi->wq_mutex)) | |
293 | return -EINTR; | |
294 | ||
4041bcdc AV |
295 | if (sbi->catatonic) |
296 | return -ENOENT; | |
297 | ||
a1362fe9 IK |
298 | wq = autofs4_find_wait(sbi, qstr); |
299 | if (wq) { | |
300 | *wait = wq; | |
301 | return 1; | |
302 | } | |
303 | } | |
304 | ||
305 | /* | |
306 | * Not ideal but the status has already gone. Of the two | |
307 | * cases where we wait on NFY_NONE neither depend on the | |
308 | * return status of the wait. | |
309 | */ | |
310 | return 0; | |
311 | } | |
312 | ||
313 | /* | |
314 | * If we've been asked to trigger a mount and the request | |
315 | * completed while we waited on the mutex ... | |
316 | */ | |
317 | if (notify == NFY_MOUNT) { | |
9e3fea16 | 318 | struct dentry *new = NULL; |
60359741 | 319 | struct path this; |
9e3fea16 IK |
320 | int valid = 1; |
321 | ||
a1362fe9 | 322 | /* |
463aea1a IK |
323 | * If the dentry was successfully mounted while we slept |
324 | * on the wait queue mutex we can return success. If it | |
325 | * isn't mounted (doesn't have submounts for the case of | |
326 | * a multi-mount with no mount at it's base) we can | |
327 | * continue on and create a new request. | |
328 | */ | |
9e3fea16 | 329 | if (!IS_ROOT(dentry)) { |
e9a7c2f1 IK |
330 | if (d_unhashed(dentry) && |
331 | d_really_is_positive(dentry)) { | |
9e3fea16 | 332 | struct dentry *parent = dentry->d_parent; |
e9a7c2f1 | 333 | |
9e3fea16 IK |
334 | new = d_lookup(parent, &dentry->d_name); |
335 | if (new) | |
336 | dentry = new; | |
337 | } | |
338 | } | |
60359741 IK |
339 | this.mnt = path->mnt; |
340 | this.dentry = dentry; | |
341 | if (path_has_submounts(&this)) | |
9e3fea16 IK |
342 | valid = 0; |
343 | ||
344 | if (new) | |
345 | dput(new); | |
346 | return valid; | |
a1362fe9 IK |
347 | } |
348 | ||
349 | return 1; | |
350 | } | |
351 | ||
e9a7c2f1 | 352 | int autofs4_wait(struct autofs_sb_info *sbi, |
dd36a882 | 353 | const struct path *path, enum autofs_notify notify) |
1da177e4 | 354 | { |
dd36a882 | 355 | struct dentry *dentry = path->dentry; |
1da177e4 | 356 | struct autofs_wait_queue *wq; |
70b52a0a | 357 | struct qstr qstr; |
1da177e4 | 358 | char *name; |
a1362fe9 | 359 | int status, ret, type; |
fbff0870 MS |
360 | pid_t pid; |
361 | pid_t tgid; | |
1da177e4 LT |
362 | |
363 | /* In catatonic mode, we don't wait for nobody */ | |
e77fbddf | 364 | if (sbi->catatonic) |
1da177e4 | 365 | return -ENOENT; |
a1362fe9 | 366 | |
fbff0870 MS |
367 | /* |
368 | * Try translating pids to the namespace of the daemon. | |
369 | * | |
370 | * Zero means failure: we are in an unrelated pid namespace. | |
371 | */ | |
372 | pid = task_pid_nr_ns(current, ns_of_pid(sbi->oz_pgrp)); | |
373 | tgid = task_tgid_nr_ns(current, ns_of_pid(sbi->oz_pgrp)); | |
374 | if (pid == 0 || tgid == 0) | |
375 | return -ENOENT; | |
376 | ||
2b0143b5 | 377 | if (d_really_is_negative(dentry)) { |
c72305b5 IK |
378 | /* |
379 | * A wait for a negative dentry is invalid for certain | |
380 | * cases. A direct or offset mount "always" has its mount | |
381 | * point directory created and so the request dentry must | |
382 | * be positive or the map key doesn't exist. The situation | |
383 | * is very similar for indirect mounts except only dentrys | |
384 | * in the root of the autofs file system may be negative. | |
385 | */ | |
a92daf6b | 386 | if (autofs_type_trigger(sbi->type)) |
c72305b5 IK |
387 | return -ENOENT; |
388 | else if (!IS_ROOT(dentry->d_parent)) | |
389 | return -ENOENT; | |
390 | } | |
eb3b1767 | 391 | |
1da177e4 LT |
392 | name = kmalloc(NAME_MAX + 1, GFP_KERNEL); |
393 | if (!name) | |
394 | return -ENOMEM; | |
395 | ||
5c0a32fc | 396 | /* If this is a direct mount request create a dummy name */ |
a92daf6b | 397 | if (IS_ROOT(dentry) && autofs_type_trigger(sbi->type)) |
70b52a0a | 398 | qstr.len = sprintf(name, "%p", dentry); |
5c0a32fc | 399 | else { |
70b52a0a JM |
400 | qstr.len = autofs4_getpath(sbi, dentry, &name); |
401 | if (!qstr.len) { | |
5c0a32fc IK |
402 | kfree(name); |
403 | return -ENOENT; | |
404 | } | |
1da177e4 | 405 | } |
70b52a0a | 406 | qstr.name = name; |
8387ff25 | 407 | qstr.hash = full_name_hash(dentry, name, qstr.len); |
1da177e4 | 408 | |
f4c7da02 IK |
409 | if (mutex_lock_interruptible(&sbi->wq_mutex)) { |
410 | kfree(qstr.name); | |
1da177e4 | 411 | return -EINTR; |
f4c7da02 | 412 | } |
a5370553 | 413 | |
60359741 | 414 | ret = validate_request(&wq, sbi, &qstr, path, notify); |
a1362fe9 | 415 | if (ret <= 0) { |
4041bcdc | 416 | if (ret != -EINTR) |
1d5599e3 | 417 | mutex_unlock(&sbi->wq_mutex); |
a1362fe9 IK |
418 | kfree(qstr.name); |
419 | return ret; | |
a5370553 | 420 | } |
cc9acc88 | 421 | |
a5370553 | 422 | if (!wq) { |
1da177e4 | 423 | /* Create a new wait queue */ |
e9a7c2f1 | 424 | wq = kmalloc(sizeof(struct autofs_wait_queue), GFP_KERNEL); |
e77fbddf | 425 | if (!wq) { |
70b52a0a | 426 | kfree(qstr.name); |
1d5599e3 | 427 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
428 | return -ENOMEM; |
429 | } | |
430 | ||
431 | wq->wait_queue_token = autofs4_next_wait_queue; | |
432 | if (++autofs4_next_wait_queue == 0) | |
433 | autofs4_next_wait_queue = 1; | |
434 | wq->next = sbi->queues; | |
435 | sbi->queues = wq; | |
436 | init_waitqueue_head(&wq->queue); | |
70b52a0a | 437 | memcpy(&wq->name, &qstr, sizeof(struct qstr)); |
5c0a32fc IK |
438 | wq->dev = autofs4_get_dev(sbi); |
439 | wq->ino = autofs4_get_ino(sbi); | |
93faccbb EB |
440 | wq->uid = current_cred()->uid; |
441 | wq->gid = current_cred()->gid; | |
fbff0870 MS |
442 | wq->pid = pid; |
443 | wq->tgid = tgid; | |
1da177e4 | 444 | wq->status = -EINTR; /* Status return if interrupted */ |
296f7bf7 | 445 | wq->wait_ctr = 2; |
3e7b1919 | 446 | |
5c0a32fc IK |
447 | if (sbi->version < 5) { |
448 | if (notify == NFY_MOUNT) | |
449 | type = autofs_ptype_missing; | |
450 | else | |
451 | type = autofs_ptype_expire_multi; | |
452 | } else { | |
453 | if (notify == NFY_MOUNT) | |
a92daf6b | 454 | type = autofs_type_trigger(sbi->type) ? |
5c0a32fc IK |
455 | autofs_ptype_missing_direct : |
456 | autofs_ptype_missing_indirect; | |
457 | else | |
a92daf6b | 458 | type = autofs_type_trigger(sbi->type) ? |
5c0a32fc IK |
459 | autofs_ptype_expire_direct : |
460 | autofs_ptype_expire_indirect; | |
461 | } | |
4dcd00b1 | 462 | |
8a78d593 IK |
463 | pr_debug("new wait id = 0x%08lx, name = %.*s, nfy=%d\n", |
464 | (unsigned long) wq->wait_queue_token, wq->name.len, | |
465 | wq->name.name, notify); | |
4dcd00b1 | 466 | |
e9a7c2f1 IK |
467 | /* |
468 | * autofs4_notify_daemon() may block; it will unlock ->wq_mutex | |
469 | */ | |
4dcd00b1 | 470 | autofs4_notify_daemon(sbi, wq, type); |
a5370553 | 471 | } else { |
296f7bf7 | 472 | wq->wait_ctr++; |
8a78d593 IK |
473 | pr_debug("existing wait id = 0x%08lx, name = %.*s, nfy=%d\n", |
474 | (unsigned long) wq->wait_queue_token, wq->name.len, | |
475 | wq->name.name, notify); | |
606035e7 AV |
476 | mutex_unlock(&sbi->wq_mutex); |
477 | kfree(qstr.name); | |
4dcd00b1 IK |
478 | } |
479 | ||
5a11d4d0 IK |
480 | /* |
481 | * wq->name.name is NULL iff the lock is already released | |
482 | * or the mount has been made catatonic. | |
483 | */ | |
70b52a0a | 484 | if (wq->name.name) { |
1da177e4 | 485 | /* Block all but "shutdown" signals while waiting */ |
b3f67a98 | 486 | unsigned long shutdown_sigs_mask; |
1da177e4 | 487 | unsigned long irqflags; |
b3f67a98 | 488 | sigset_t oldset; |
1da177e4 LT |
489 | |
490 | spin_lock_irqsave(¤t->sighand->siglock, irqflags); | |
491 | oldset = current->blocked; | |
b3f67a98 IK |
492 | shutdown_sigs_mask = SHUTDOWN_SIGS & ~oldset.sig[0]; |
493 | siginitsetinv(¤t->blocked, shutdown_sigs_mask); | |
1da177e4 LT |
494 | recalc_sigpending(); |
495 | spin_unlock_irqrestore(¤t->sighand->siglock, irqflags); | |
496 | ||
70b52a0a | 497 | wait_event_interruptible(wq->queue, wq->name.name == NULL); |
1da177e4 LT |
498 | |
499 | spin_lock_irqsave(¤t->sighand->siglock, irqflags); | |
500 | current->blocked = oldset; | |
501 | recalc_sigpending(); | |
502 | spin_unlock_irqrestore(¤t->sighand->siglock, irqflags); | |
503 | } else { | |
8a78d593 | 504 | pr_debug("skipped sleeping\n"); |
1da177e4 LT |
505 | } |
506 | ||
507 | status = wq->status; | |
508 | ||
c0f54d3e IK |
509 | /* |
510 | * For direct and offset mounts we need to track the requester's | |
511 | * uid and gid in the dentry info struct. This is so it can be | |
512 | * supplied, on request, by the misc device ioctl interface. | |
513 | * This is needed during daemon resatart when reconnecting | |
514 | * to existing, active, autofs mounts. The uid and gid (and | |
515 | * related string values) may be used for macro substitution | |
516 | * in autofs mount maps. | |
517 | */ | |
518 | if (!status) { | |
519 | struct autofs_info *ino; | |
520 | struct dentry *de = NULL; | |
521 | ||
522 | /* direct mount or browsable map */ | |
523 | ino = autofs4_dentry_ino(dentry); | |
524 | if (!ino) { | |
525 | /* If not lookup actual dentry used */ | |
526 | de = d_lookup(dentry->d_parent, &dentry->d_name); | |
527 | if (de) | |
528 | ino = autofs4_dentry_ino(de); | |
529 | } | |
530 | ||
531 | /* Set mount requester */ | |
532 | if (ino) { | |
533 | spin_lock(&sbi->fs_lock); | |
534 | ino->uid = wq->uid; | |
535 | ino->gid = wq->gid; | |
536 | spin_unlock(&sbi->fs_lock); | |
537 | } | |
538 | ||
539 | if (de) | |
540 | dput(de); | |
541 | } | |
542 | ||
1da177e4 | 543 | /* Are we the last process to need status? */ |
296f7bf7 IK |
544 | mutex_lock(&sbi->wq_mutex); |
545 | if (!--wq->wait_ctr) | |
1da177e4 | 546 | kfree(wq); |
296f7bf7 | 547 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
548 | |
549 | return status; | |
550 | } | |
551 | ||
552 | ||
553 | int autofs4_wait_release(struct autofs_sb_info *sbi, autofs_wqt_t wait_queue_token, int status) | |
554 | { | |
555 | struct autofs_wait_queue *wq, **wql; | |
556 | ||
1d5599e3 | 557 | mutex_lock(&sbi->wq_mutex); |
c80544dc | 558 | for (wql = &sbi->queues; (wq = *wql) != NULL; wql = &wq->next) { |
e77fbddf | 559 | if (wq->wait_queue_token == wait_queue_token) |
1da177e4 LT |
560 | break; |
561 | } | |
562 | ||
e77fbddf | 563 | if (!wq) { |
1d5599e3 | 564 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
565 | return -EINVAL; |
566 | } | |
567 | ||
568 | *wql = wq->next; /* Unlink from chain */ | |
70b52a0a JM |
569 | kfree(wq->name.name); |
570 | wq->name.name = NULL; /* Do not wait on this queue */ | |
1da177e4 | 571 | wq->status = status; |
296f7bf7 IK |
572 | wake_up_interruptible(&wq->queue); |
573 | if (!--wq->wait_ctr) | |
1da177e4 | 574 | kfree(wq); |
296f7bf7 | 575 | mutex_unlock(&sbi->wq_mutex); |
1da177e4 LT |
576 | |
577 | return 0; | |
578 | } |