Commit | Line | Data |
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d6910058 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
ebc921ca IK |
2 | /* |
3 | * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved | |
4 | * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org> | |
5 | * Copyright 2001-2006 Ian Kent <raven@themaw.net> | |
ebc921ca IK |
6 | */ |
7 | ||
8 | #include "autofs_i.h" | |
9 | ||
ebc921ca IK |
10 | /* Check if a dentry can be expired */ |
11 | static inline int autofs_can_expire(struct dentry *dentry, | |
e5c85e1f | 12 | unsigned long timeout, unsigned int how) |
ebc921ca IK |
13 | { |
14 | struct autofs_info *ino = autofs_dentry_ino(dentry); | |
15 | ||
16 | /* dentry in the process of being deleted */ | |
17 | if (ino == NULL) | |
18 | return 0; | |
19 | ||
e5c85e1f | 20 | if (!(how & AUTOFS_EXP_IMMEDIATE)) { |
ebc921ca | 21 | /* Too young to die */ |
2fd9944f | 22 | if (!timeout || time_after(ino->last_used + timeout, jiffies)) |
ebc921ca IK |
23 | return 0; |
24 | } | |
25 | return 1; | |
26 | } | |
27 | ||
28 | /* Check a mount point for busyness */ | |
cbf6898f IK |
29 | static int autofs_mount_busy(struct vfsmount *mnt, |
30 | struct dentry *dentry, unsigned int how) | |
ebc921ca IK |
31 | { |
32 | struct dentry *top = dentry; | |
33 | struct path path = {.mnt = mnt, .dentry = dentry}; | |
34 | int status = 1; | |
35 | ||
36 | pr_debug("dentry %p %pd\n", dentry, dentry); | |
37 | ||
38 | path_get(&path); | |
39 | ||
40 | if (!follow_down_one(&path)) | |
41 | goto done; | |
42 | ||
43 | if (is_autofs_dentry(path.dentry)) { | |
44 | struct autofs_sb_info *sbi = autofs_sbi(path.dentry->d_sb); | |
45 | ||
46 | /* This is an autofs submount, we can't expire it */ | |
47 | if (autofs_type_indirect(sbi->type)) | |
48 | goto done; | |
49 | } | |
50 | ||
cbf6898f IK |
51 | /* Not a submount, has a forced expire been requested */ |
52 | if (how & AUTOFS_EXP_FORCED) { | |
53 | status = 0; | |
54 | goto done; | |
55 | } | |
56 | ||
ebc921ca IK |
57 | /* Update the expiry counter if fs is busy */ |
58 | if (!may_umount_tree(path.mnt)) { | |
59 | struct autofs_info *ino; | |
60 | ||
61 | ino = autofs_dentry_ino(top); | |
62 | ino->last_used = jiffies; | |
63 | goto done; | |
64 | } | |
65 | ||
66 | status = 0; | |
67 | done: | |
68 | pr_debug("returning = %d\n", status); | |
69 | path_put(&path); | |
70 | return status; | |
71 | } | |
72 | ||
ff09297e AV |
73 | /* p->d_lock held */ |
74 | static struct dentry *positive_after(struct dentry *p, struct dentry *child) | |
75 | { | |
76 | if (child) | |
77 | child = list_next_entry(child, d_child); | |
78 | else | |
79 | child = list_first_entry(&p->d_subdirs, struct dentry, d_child); | |
80 | ||
81 | list_for_each_entry_from(child, &p->d_subdirs, d_child) { | |
82 | spin_lock_nested(&child->d_lock, DENTRY_D_LOCK_NESTED); | |
83 | if (simple_positive(child)) { | |
84 | dget_dlock(child); | |
85 | spin_unlock(&child->d_lock); | |
86 | return child; | |
87 | } | |
88 | spin_unlock(&child->d_lock); | |
89 | } | |
90 | ||
91 | return NULL; | |
92 | } | |
93 | ||
ebc921ca IK |
94 | /* |
95 | * Calculate and dget next entry in the subdirs list under root. | |
96 | */ | |
97 | static struct dentry *get_next_positive_subdir(struct dentry *prev, | |
98 | struct dentry *root) | |
99 | { | |
100 | struct autofs_sb_info *sbi = autofs_sbi(root->d_sb); | |
ebc921ca IK |
101 | struct dentry *q; |
102 | ||
103 | spin_lock(&sbi->lookup_lock); | |
104 | spin_lock(&root->d_lock); | |
ff09297e | 105 | q = positive_after(root, prev); |
ebc921ca IK |
106 | spin_unlock(&root->d_lock); |
107 | spin_unlock(&sbi->lookup_lock); | |
ebc921ca | 108 | dput(prev); |
ebc921ca IK |
109 | return q; |
110 | } | |
111 | ||
112 | /* | |
113 | * Calculate and dget next entry in top down tree traversal. | |
114 | */ | |
115 | static struct dentry *get_next_positive_dentry(struct dentry *prev, | |
116 | struct dentry *root) | |
117 | { | |
118 | struct autofs_sb_info *sbi = autofs_sbi(root->d_sb); | |
ff09297e | 119 | struct dentry *p = prev, *ret = NULL, *d = NULL; |
ebc921ca IK |
120 | |
121 | if (prev == NULL) | |
122 | return dget(root); | |
123 | ||
124 | spin_lock(&sbi->lookup_lock); | |
ebc921ca | 125 | spin_lock(&p->d_lock); |
ff09297e AV |
126 | while (1) { |
127 | struct dentry *parent; | |
ebc921ca | 128 | |
ff09297e AV |
129 | ret = positive_after(p, d); |
130 | if (ret || p == root) | |
131 | break; | |
132 | parent = p->d_parent; | |
ebc921ca | 133 | spin_unlock(&p->d_lock); |
ff09297e AV |
134 | spin_lock(&parent->d_lock); |
135 | d = p; | |
136 | p = parent; | |
ebc921ca | 137 | } |
ebc921ca IK |
138 | spin_unlock(&p->d_lock); |
139 | spin_unlock(&sbi->lookup_lock); | |
ebc921ca | 140 | dput(prev); |
ebc921ca IK |
141 | return ret; |
142 | } | |
143 | ||
144 | /* | |
145 | * Check a direct mount point for busyness. | |
146 | * Direct mounts have similar expiry semantics to tree mounts. | |
147 | * The tree is not busy iff no mountpoints are busy and there are no | |
148 | * autofs submounts. | |
149 | */ | |
150 | static int autofs_direct_busy(struct vfsmount *mnt, | |
151 | struct dentry *top, | |
152 | unsigned long timeout, | |
e5c85e1f | 153 | unsigned int how) |
ebc921ca IK |
154 | { |
155 | pr_debug("top %p %pd\n", top, top); | |
156 | ||
cbf6898f IK |
157 | /* Forced expire, user space handles busy mounts */ |
158 | if (how & AUTOFS_EXP_FORCED) | |
159 | return 0; | |
160 | ||
ebc921ca IK |
161 | /* If it's busy update the expiry counters */ |
162 | if (!may_umount_tree(mnt)) { | |
163 | struct autofs_info *ino; | |
164 | ||
165 | ino = autofs_dentry_ino(top); | |
166 | if (ino) | |
167 | ino->last_used = jiffies; | |
168 | return 1; | |
169 | } | |
170 | ||
171 | /* Timeout of a direct mount is determined by its top dentry */ | |
e5c85e1f | 172 | if (!autofs_can_expire(top, timeout, how)) |
ebc921ca IK |
173 | return 1; |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | /* | |
179 | * Check a directory tree of mount points for busyness | |
180 | * The tree is not busy iff no mountpoints are busy | |
181 | */ | |
182 | static int autofs_tree_busy(struct vfsmount *mnt, | |
183 | struct dentry *top, | |
184 | unsigned long timeout, | |
e5c85e1f | 185 | unsigned int how) |
ebc921ca IK |
186 | { |
187 | struct autofs_info *top_ino = autofs_dentry_ino(top); | |
188 | struct dentry *p; | |
189 | ||
190 | pr_debug("top %p %pd\n", top, top); | |
191 | ||
192 | /* Negative dentry - give up */ | |
193 | if (!simple_positive(top)) | |
194 | return 1; | |
195 | ||
196 | p = NULL; | |
197 | while ((p = get_next_positive_dentry(p, top))) { | |
198 | pr_debug("dentry %p %pd\n", p, p); | |
199 | ||
200 | /* | |
201 | * Is someone visiting anywhere in the subtree ? | |
202 | * If there's no mount we need to check the usage | |
203 | * count for the autofs dentry. | |
204 | * If the fs is busy update the expiry counter. | |
205 | */ | |
206 | if (d_mountpoint(p)) { | |
cbf6898f | 207 | if (autofs_mount_busy(mnt, p, how)) { |
ebc921ca IK |
208 | top_ino->last_used = jiffies; |
209 | dput(p); | |
210 | return 1; | |
211 | } | |
212 | } else { | |
213 | struct autofs_info *ino = autofs_dentry_ino(p); | |
850d71ac | 214 | unsigned int ino_count = READ_ONCE(ino->count); |
ebc921ca IK |
215 | |
216 | /* allow for dget above and top is already dgot */ | |
217 | if (p == top) | |
218 | ino_count += 2; | |
219 | else | |
220 | ino_count++; | |
221 | ||
222 | if (d_count(p) > ino_count) { | |
223 | top_ino->last_used = jiffies; | |
224 | dput(p); | |
225 | return 1; | |
226 | } | |
227 | } | |
228 | } | |
229 | ||
cbf6898f IK |
230 | /* Forced expire, user space handles busy mounts */ |
231 | if (how & AUTOFS_EXP_FORCED) | |
232 | return 0; | |
233 | ||
ebc921ca | 234 | /* Timeout of a tree mount is ultimately determined by its top dentry */ |
e5c85e1f | 235 | if (!autofs_can_expire(top, timeout, how)) |
ebc921ca IK |
236 | return 1; |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | static struct dentry *autofs_check_leaves(struct vfsmount *mnt, | |
242 | struct dentry *parent, | |
243 | unsigned long timeout, | |
e5c85e1f | 244 | unsigned int how) |
ebc921ca IK |
245 | { |
246 | struct dentry *p; | |
247 | ||
248 | pr_debug("parent %p %pd\n", parent, parent); | |
249 | ||
250 | p = NULL; | |
251 | while ((p = get_next_positive_dentry(p, parent))) { | |
252 | pr_debug("dentry %p %pd\n", p, p); | |
253 | ||
254 | if (d_mountpoint(p)) { | |
255 | /* Can we umount this guy */ | |
cbf6898f | 256 | if (autofs_mount_busy(mnt, p, how)) |
ebc921ca IK |
257 | continue; |
258 | ||
cbf6898f IK |
259 | /* This isn't a submount so if a forced expire |
260 | * has been requested, user space handles busy | |
261 | * mounts */ | |
262 | if (how & AUTOFS_EXP_FORCED) | |
263 | return p; | |
264 | ||
ebc921ca | 265 | /* Can we expire this guy */ |
e5c85e1f | 266 | if (autofs_can_expire(p, timeout, how)) |
ebc921ca IK |
267 | return p; |
268 | } | |
269 | } | |
270 | return NULL; | |
271 | } | |
272 | ||
273 | /* Check if we can expire a direct mount (possibly a tree) */ | |
5d30517d IK |
274 | static struct dentry *autofs_expire_direct(struct super_block *sb, |
275 | struct vfsmount *mnt, | |
276 | struct autofs_sb_info *sbi, | |
e5c85e1f | 277 | unsigned int how) |
ebc921ca | 278 | { |
ebc921ca | 279 | struct dentry *root = dget(sb->s_root); |
ebc921ca | 280 | struct autofs_info *ino; |
e5c85e1f | 281 | unsigned long timeout; |
ebc921ca IK |
282 | |
283 | if (!root) | |
284 | return NULL; | |
285 | ||
ebc921ca IK |
286 | timeout = sbi->exp_timeout; |
287 | ||
e5c85e1f | 288 | if (!autofs_direct_busy(mnt, root, timeout, how)) { |
ebc921ca IK |
289 | spin_lock(&sbi->fs_lock); |
290 | ino = autofs_dentry_ino(root); | |
291 | /* No point expiring a pending mount */ | |
292 | if (ino->flags & AUTOFS_INF_PENDING) { | |
293 | spin_unlock(&sbi->fs_lock); | |
294 | goto out; | |
295 | } | |
296 | ino->flags |= AUTOFS_INF_WANT_EXPIRE; | |
297 | spin_unlock(&sbi->fs_lock); | |
298 | synchronize_rcu(); | |
e5c85e1f | 299 | if (!autofs_direct_busy(mnt, root, timeout, how)) { |
ebc921ca IK |
300 | spin_lock(&sbi->fs_lock); |
301 | ino->flags |= AUTOFS_INF_EXPIRING; | |
302 | init_completion(&ino->expire_complete); | |
303 | spin_unlock(&sbi->fs_lock); | |
304 | return root; | |
305 | } | |
306 | spin_lock(&sbi->fs_lock); | |
307 | ino->flags &= ~AUTOFS_INF_WANT_EXPIRE; | |
308 | spin_unlock(&sbi->fs_lock); | |
309 | } | |
310 | out: | |
311 | dput(root); | |
312 | ||
313 | return NULL; | |
314 | } | |
315 | ||
316 | /* Check if 'dentry' should expire, or return a nearby | |
317 | * dentry that is suitable. | |
318 | * If returned dentry is different from arg dentry, | |
319 | * then a dget() reference was taken, else not. | |
320 | */ | |
321 | static struct dentry *should_expire(struct dentry *dentry, | |
322 | struct vfsmount *mnt, | |
323 | unsigned long timeout, | |
e5c85e1f | 324 | unsigned int how) |
ebc921ca | 325 | { |
ebc921ca IK |
326 | struct autofs_info *ino = autofs_dentry_ino(dentry); |
327 | unsigned int ino_count; | |
328 | ||
329 | /* No point expiring a pending mount */ | |
330 | if (ino->flags & AUTOFS_INF_PENDING) | |
331 | return NULL; | |
332 | ||
333 | /* | |
334 | * Case 1: (i) indirect mount or top level pseudo direct mount | |
335 | * (autofs-4.1). | |
336 | * (ii) indirect mount with offset mount, check the "/" | |
337 | * offset (autofs-5.0+). | |
338 | */ | |
339 | if (d_mountpoint(dentry)) { | |
340 | pr_debug("checking mountpoint %p %pd\n", dentry, dentry); | |
341 | ||
342 | /* Can we umount this guy */ | |
cbf6898f | 343 | if (autofs_mount_busy(mnt, dentry, how)) |
ebc921ca IK |
344 | return NULL; |
345 | ||
cbf6898f IK |
346 | /* This isn't a submount so if a forced expire |
347 | * has been requested, user space handles busy | |
348 | * mounts */ | |
349 | if (how & AUTOFS_EXP_FORCED) | |
350 | return dentry; | |
351 | ||
ebc921ca | 352 | /* Can we expire this guy */ |
e5c85e1f | 353 | if (autofs_can_expire(dentry, timeout, how)) |
ebc921ca IK |
354 | return dentry; |
355 | return NULL; | |
356 | } | |
357 | ||
358 | if (d_really_is_positive(dentry) && d_is_symlink(dentry)) { | |
359 | pr_debug("checking symlink %p %pd\n", dentry, dentry); | |
cbf6898f IK |
360 | |
361 | /* Forced expire, user space handles busy mounts */ | |
362 | if (how & AUTOFS_EXP_FORCED) | |
363 | return dentry; | |
364 | ||
ebc921ca IK |
365 | /* |
366 | * A symlink can't be "busy" in the usual sense so | |
367 | * just check last used for expire timeout. | |
368 | */ | |
e5c85e1f | 369 | if (autofs_can_expire(dentry, timeout, how)) |
ebc921ca IK |
370 | return dentry; |
371 | return NULL; | |
372 | } | |
373 | ||
374 | if (simple_empty(dentry)) | |
375 | return NULL; | |
376 | ||
377 | /* Case 2: tree mount, expire iff entire tree is not busy */ | |
e5c85e1f | 378 | if (!(how & AUTOFS_EXP_LEAVES)) { |
cbf6898f IK |
379 | /* Not a forced expire? */ |
380 | if (!(how & AUTOFS_EXP_FORCED)) { | |
381 | /* ref-walk currently on this dentry? */ | |
850d71ac | 382 | ino_count = READ_ONCE(ino->count) + 1; |
cbf6898f IK |
383 | if (d_count(dentry) > ino_count) |
384 | return NULL; | |
385 | } | |
ebc921ca | 386 | |
e5c85e1f | 387 | if (!autofs_tree_busy(mnt, dentry, timeout, how)) |
ebc921ca IK |
388 | return dentry; |
389 | /* | |
390 | * Case 3: pseudo direct mount, expire individual leaves | |
391 | * (autofs-4.1). | |
392 | */ | |
393 | } else { | |
ebc921ca IK |
394 | struct dentry *expired; |
395 | ||
cbf6898f IK |
396 | /* Not a forced expire? */ |
397 | if (!(how & AUTOFS_EXP_FORCED)) { | |
398 | /* ref-walk currently on this dentry? */ | |
850d71ac | 399 | ino_count = READ_ONCE(ino->count) + 1; |
cbf6898f IK |
400 | if (d_count(dentry) > ino_count) |
401 | return NULL; | |
402 | } | |
ebc921ca | 403 | |
e5c85e1f | 404 | expired = autofs_check_leaves(mnt, dentry, timeout, how); |
ebc921ca IK |
405 | if (expired) { |
406 | if (expired == dentry) | |
407 | dput(dentry); | |
408 | return expired; | |
409 | } | |
410 | } | |
411 | return NULL; | |
412 | } | |
413 | ||
414 | /* | |
415 | * Find an eligible tree to time-out | |
416 | * A tree is eligible if :- | |
417 | * - it is unused by any user process | |
418 | * - it has been unused for exp_timeout time | |
419 | */ | |
571bc35c IK |
420 | static struct dentry *autofs_expire_indirect(struct super_block *sb, |
421 | struct vfsmount *mnt, | |
422 | struct autofs_sb_info *sbi, | |
e5c85e1f | 423 | unsigned int how) |
ebc921ca IK |
424 | { |
425 | unsigned long timeout; | |
426 | struct dentry *root = sb->s_root; | |
427 | struct dentry *dentry; | |
428 | struct dentry *expired; | |
429 | struct dentry *found; | |
430 | struct autofs_info *ino; | |
431 | ||
432 | if (!root) | |
433 | return NULL; | |
434 | ||
ebc921ca IK |
435 | timeout = sbi->exp_timeout; |
436 | ||
437 | dentry = NULL; | |
438 | while ((dentry = get_next_positive_subdir(dentry, root))) { | |
ebc921ca IK |
439 | spin_lock(&sbi->fs_lock); |
440 | ino = autofs_dentry_ino(dentry); | |
441 | if (ino->flags & AUTOFS_INF_WANT_EXPIRE) { | |
442 | spin_unlock(&sbi->fs_lock); | |
443 | continue; | |
444 | } | |
445 | spin_unlock(&sbi->fs_lock); | |
446 | ||
e5c85e1f | 447 | expired = should_expire(dentry, mnt, timeout, how); |
ebc921ca IK |
448 | if (!expired) |
449 | continue; | |
450 | ||
451 | spin_lock(&sbi->fs_lock); | |
452 | ino = autofs_dentry_ino(expired); | |
453 | ino->flags |= AUTOFS_INF_WANT_EXPIRE; | |
454 | spin_unlock(&sbi->fs_lock); | |
455 | synchronize_rcu(); | |
456 | ||
457 | /* Make sure a reference is not taken on found if | |
458 | * things have changed. | |
459 | */ | |
e5c85e1f IK |
460 | how &= ~AUTOFS_EXP_LEAVES; |
461 | found = should_expire(expired, mnt, timeout, how); | |
03ad0d70 AV |
462 | if (found != expired) { // something has changed, continue |
463 | dput(found); | |
ebc921ca | 464 | goto next; |
03ad0d70 | 465 | } |
ebc921ca IK |
466 | |
467 | if (expired != dentry) | |
468 | dput(dentry); | |
469 | ||
470 | spin_lock(&sbi->fs_lock); | |
471 | goto found; | |
472 | next: | |
473 | spin_lock(&sbi->fs_lock); | |
474 | ino->flags &= ~AUTOFS_INF_WANT_EXPIRE; | |
475 | spin_unlock(&sbi->fs_lock); | |
476 | if (expired != dentry) | |
477 | dput(expired); | |
478 | } | |
479 | return NULL; | |
480 | ||
481 | found: | |
482 | pr_debug("returning %p %pd\n", expired, expired); | |
483 | ino->flags |= AUTOFS_INF_EXPIRING; | |
484 | init_completion(&ino->expire_complete); | |
485 | spin_unlock(&sbi->fs_lock); | |
486 | return expired; | |
487 | } | |
488 | ||
489 | int autofs_expire_wait(const struct path *path, int rcu_walk) | |
490 | { | |
491 | struct dentry *dentry = path->dentry; | |
492 | struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb); | |
493 | struct autofs_info *ino = autofs_dentry_ino(dentry); | |
494 | int status; | |
495 | int state; | |
496 | ||
497 | /* Block on any pending expire */ | |
498 | if (!(ino->flags & AUTOFS_INF_WANT_EXPIRE)) | |
499 | return 0; | |
500 | if (rcu_walk) | |
501 | return -ECHILD; | |
502 | ||
503 | retry: | |
504 | spin_lock(&sbi->fs_lock); | |
505 | state = ino->flags & (AUTOFS_INF_WANT_EXPIRE | AUTOFS_INF_EXPIRING); | |
506 | if (state == AUTOFS_INF_WANT_EXPIRE) { | |
507 | spin_unlock(&sbi->fs_lock); | |
508 | /* | |
509 | * Possibly being selected for expire, wait until | |
510 | * it's selected or not. | |
511 | */ | |
512 | schedule_timeout_uninterruptible(HZ/10); | |
513 | goto retry; | |
514 | } | |
515 | if (state & AUTOFS_INF_EXPIRING) { | |
516 | spin_unlock(&sbi->fs_lock); | |
517 | ||
518 | pr_debug("waiting for expire %p name=%pd\n", dentry, dentry); | |
519 | ||
520 | status = autofs_wait(sbi, path, NFY_NONE); | |
521 | wait_for_completion(&ino->expire_complete); | |
522 | ||
523 | pr_debug("expire done status=%d\n", status); | |
524 | ||
525 | if (d_unhashed(dentry)) | |
526 | return -EAGAIN; | |
527 | ||
528 | return status; | |
529 | } | |
530 | spin_unlock(&sbi->fs_lock); | |
531 | ||
532 | return 0; | |
533 | } | |
534 | ||
535 | /* Perform an expiry operation */ | |
536 | int autofs_expire_run(struct super_block *sb, | |
537 | struct vfsmount *mnt, | |
538 | struct autofs_sb_info *sbi, | |
539 | struct autofs_packet_expire __user *pkt_p) | |
540 | { | |
541 | struct autofs_packet_expire pkt; | |
542 | struct autofs_info *ino; | |
543 | struct dentry *dentry; | |
544 | int ret = 0; | |
545 | ||
546 | memset(&pkt, 0, sizeof(pkt)); | |
547 | ||
548 | pkt.hdr.proto_version = sbi->version; | |
549 | pkt.hdr.type = autofs_ptype_expire; | |
550 | ||
551 | dentry = autofs_expire_indirect(sb, mnt, sbi, 0); | |
552 | if (!dentry) | |
553 | return -EAGAIN; | |
554 | ||
555 | pkt.len = dentry->d_name.len; | |
556 | memcpy(pkt.name, dentry->d_name.name, pkt.len); | |
557 | pkt.name[pkt.len] = '\0'; | |
ebc921ca IK |
558 | |
559 | if (copy_to_user(pkt_p, &pkt, sizeof(struct autofs_packet_expire))) | |
560 | ret = -EFAULT; | |
561 | ||
562 | spin_lock(&sbi->fs_lock); | |
563 | ino = autofs_dentry_ino(dentry); | |
564 | /* avoid rapid-fire expire attempts if expiry fails */ | |
2fd9944f | 565 | ino->last_used = jiffies; |
ebc921ca IK |
566 | ino->flags &= ~(AUTOFS_INF_EXPIRING|AUTOFS_INF_WANT_EXPIRE); |
567 | complete_all(&ino->expire_complete); | |
568 | spin_unlock(&sbi->fs_lock); | |
569 | ||
63ce5f55 PB |
570 | dput(dentry); |
571 | ||
ebc921ca IK |
572 | return ret; |
573 | } | |
574 | ||
575 | int autofs_do_expire_multi(struct super_block *sb, struct vfsmount *mnt, | |
e5c85e1f | 576 | struct autofs_sb_info *sbi, unsigned int how) |
ebc921ca IK |
577 | { |
578 | struct dentry *dentry; | |
579 | int ret = -EAGAIN; | |
580 | ||
581 | if (autofs_type_trigger(sbi->type)) | |
e5c85e1f | 582 | dentry = autofs_expire_direct(sb, mnt, sbi, how); |
ebc921ca | 583 | else |
e5c85e1f | 584 | dentry = autofs_expire_indirect(sb, mnt, sbi, how); |
ebc921ca IK |
585 | |
586 | if (dentry) { | |
587 | struct autofs_info *ino = autofs_dentry_ino(dentry); | |
588 | const struct path path = { .mnt = mnt, .dentry = dentry }; | |
589 | ||
590 | /* This is synchronous because it makes the daemon a | |
591 | * little easier | |
592 | */ | |
593 | ret = autofs_wait(sbi, &path, NFY_EXPIRE); | |
594 | ||
595 | spin_lock(&sbi->fs_lock); | |
596 | /* avoid rapid-fire expire attempts if expiry fails */ | |
2fd9944f | 597 | ino->last_used = jiffies; |
ebc921ca IK |
598 | ino->flags &= ~(AUTOFS_INF_EXPIRING|AUTOFS_INF_WANT_EXPIRE); |
599 | complete_all(&ino->expire_complete); | |
600 | spin_unlock(&sbi->fs_lock); | |
601 | dput(dentry); | |
602 | } | |
603 | ||
604 | return ret; | |
605 | } | |
606 | ||
607 | /* | |
608 | * Call repeatedly until it returns -EAGAIN, meaning there's nothing | |
609 | * more to be done. | |
610 | */ | |
611 | int autofs_expire_multi(struct super_block *sb, struct vfsmount *mnt, | |
612 | struct autofs_sb_info *sbi, int __user *arg) | |
613 | { | |
e5c85e1f | 614 | unsigned int how = 0; |
ebc921ca | 615 | |
e5c85e1f | 616 | if (arg && get_user(how, arg)) |
ebc921ca IK |
617 | return -EFAULT; |
618 | ||
e5c85e1f | 619 | return autofs_do_expire_multi(sb, mnt, sbi, how); |
ebc921ca | 620 | } |