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 | { | |
da549bdd | 76 | child = child ? d_next_sibling(child) : d_first_child(p); |
ff09297e | 77 | |
da549bdd | 78 | hlist_for_each_entry_from(child, d_sib) { |
ff09297e AV |
79 | spin_lock_nested(&child->d_lock, DENTRY_D_LOCK_NESTED); |
80 | if (simple_positive(child)) { | |
81 | dget_dlock(child); | |
82 | spin_unlock(&child->d_lock); | |
83 | return child; | |
84 | } | |
85 | spin_unlock(&child->d_lock); | |
86 | } | |
87 | ||
88 | return NULL; | |
89 | } | |
90 | ||
ebc921ca IK |
91 | /* |
92 | * Calculate and dget next entry in the subdirs list under root. | |
93 | */ | |
94 | static struct dentry *get_next_positive_subdir(struct dentry *prev, | |
95 | struct dentry *root) | |
96 | { | |
97 | struct autofs_sb_info *sbi = autofs_sbi(root->d_sb); | |
ebc921ca IK |
98 | struct dentry *q; |
99 | ||
100 | spin_lock(&sbi->lookup_lock); | |
101 | spin_lock(&root->d_lock); | |
ff09297e | 102 | q = positive_after(root, prev); |
ebc921ca IK |
103 | spin_unlock(&root->d_lock); |
104 | spin_unlock(&sbi->lookup_lock); | |
ebc921ca | 105 | dput(prev); |
ebc921ca IK |
106 | return q; |
107 | } | |
108 | ||
109 | /* | |
110 | * Calculate and dget next entry in top down tree traversal. | |
111 | */ | |
112 | static struct dentry *get_next_positive_dentry(struct dentry *prev, | |
113 | struct dentry *root) | |
114 | { | |
115 | struct autofs_sb_info *sbi = autofs_sbi(root->d_sb); | |
ff09297e | 116 | struct dentry *p = prev, *ret = NULL, *d = NULL; |
ebc921ca IK |
117 | |
118 | if (prev == NULL) | |
119 | return dget(root); | |
120 | ||
121 | spin_lock(&sbi->lookup_lock); | |
ebc921ca | 122 | spin_lock(&p->d_lock); |
ff09297e AV |
123 | while (1) { |
124 | struct dentry *parent; | |
ebc921ca | 125 | |
ff09297e AV |
126 | ret = positive_after(p, d); |
127 | if (ret || p == root) | |
128 | break; | |
129 | parent = p->d_parent; | |
ebc921ca | 130 | spin_unlock(&p->d_lock); |
ff09297e AV |
131 | spin_lock(&parent->d_lock); |
132 | d = p; | |
133 | p = parent; | |
ebc921ca | 134 | } |
ebc921ca IK |
135 | spin_unlock(&p->d_lock); |
136 | spin_unlock(&sbi->lookup_lock); | |
ebc921ca | 137 | dput(prev); |
ebc921ca IK |
138 | return ret; |
139 | } | |
140 | ||
141 | /* | |
142 | * Check a direct mount point for busyness. | |
143 | * Direct mounts have similar expiry semantics to tree mounts. | |
144 | * The tree is not busy iff no mountpoints are busy and there are no | |
145 | * autofs submounts. | |
146 | */ | |
147 | static int autofs_direct_busy(struct vfsmount *mnt, | |
148 | struct dentry *top, | |
149 | unsigned long timeout, | |
e5c85e1f | 150 | unsigned int how) |
ebc921ca IK |
151 | { |
152 | pr_debug("top %p %pd\n", top, top); | |
153 | ||
cbf6898f IK |
154 | /* Forced expire, user space handles busy mounts */ |
155 | if (how & AUTOFS_EXP_FORCED) | |
156 | return 0; | |
157 | ||
ebc921ca IK |
158 | /* If it's busy update the expiry counters */ |
159 | if (!may_umount_tree(mnt)) { | |
160 | struct autofs_info *ino; | |
161 | ||
162 | ino = autofs_dentry_ino(top); | |
163 | if (ino) | |
164 | ino->last_used = jiffies; | |
165 | return 1; | |
166 | } | |
167 | ||
168 | /* Timeout of a direct mount is determined by its top dentry */ | |
e5c85e1f | 169 | if (!autofs_can_expire(top, timeout, how)) |
ebc921ca IK |
170 | return 1; |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | /* | |
176 | * Check a directory tree of mount points for busyness | |
177 | * The tree is not busy iff no mountpoints are busy | |
178 | */ | |
179 | static int autofs_tree_busy(struct vfsmount *mnt, | |
180 | struct dentry *top, | |
181 | unsigned long timeout, | |
e5c85e1f | 182 | unsigned int how) |
ebc921ca IK |
183 | { |
184 | struct autofs_info *top_ino = autofs_dentry_ino(top); | |
185 | struct dentry *p; | |
186 | ||
187 | pr_debug("top %p %pd\n", top, top); | |
188 | ||
189 | /* Negative dentry - give up */ | |
190 | if (!simple_positive(top)) | |
191 | return 1; | |
192 | ||
193 | p = NULL; | |
194 | while ((p = get_next_positive_dentry(p, top))) { | |
195 | pr_debug("dentry %p %pd\n", p, p); | |
196 | ||
197 | /* | |
198 | * Is someone visiting anywhere in the subtree ? | |
199 | * If there's no mount we need to check the usage | |
200 | * count for the autofs dentry. | |
201 | * If the fs is busy update the expiry counter. | |
202 | */ | |
203 | if (d_mountpoint(p)) { | |
cbf6898f | 204 | if (autofs_mount_busy(mnt, p, how)) { |
ebc921ca IK |
205 | top_ino->last_used = jiffies; |
206 | dput(p); | |
207 | return 1; | |
208 | } | |
209 | } else { | |
210 | struct autofs_info *ino = autofs_dentry_ino(p); | |
850d71ac | 211 | unsigned int ino_count = READ_ONCE(ino->count); |
ebc921ca IK |
212 | |
213 | /* allow for dget above and top is already dgot */ | |
214 | if (p == top) | |
215 | ino_count += 2; | |
216 | else | |
217 | ino_count++; | |
218 | ||
219 | if (d_count(p) > ino_count) { | |
220 | top_ino->last_used = jiffies; | |
221 | dput(p); | |
222 | return 1; | |
223 | } | |
224 | } | |
225 | } | |
226 | ||
cbf6898f IK |
227 | /* Forced expire, user space handles busy mounts */ |
228 | if (how & AUTOFS_EXP_FORCED) | |
229 | return 0; | |
230 | ||
ebc921ca | 231 | /* Timeout of a tree mount is ultimately determined by its top dentry */ |
e5c85e1f | 232 | if (!autofs_can_expire(top, timeout, how)) |
ebc921ca IK |
233 | return 1; |
234 | ||
235 | return 0; | |
236 | } | |
237 | ||
238 | static struct dentry *autofs_check_leaves(struct vfsmount *mnt, | |
239 | struct dentry *parent, | |
240 | unsigned long timeout, | |
e5c85e1f | 241 | unsigned int how) |
ebc921ca IK |
242 | { |
243 | struct dentry *p; | |
244 | ||
245 | pr_debug("parent %p %pd\n", parent, parent); | |
246 | ||
247 | p = NULL; | |
248 | while ((p = get_next_positive_dentry(p, parent))) { | |
249 | pr_debug("dentry %p %pd\n", p, p); | |
250 | ||
251 | if (d_mountpoint(p)) { | |
252 | /* Can we umount this guy */ | |
cbf6898f | 253 | if (autofs_mount_busy(mnt, p, how)) |
ebc921ca IK |
254 | continue; |
255 | ||
cbf6898f IK |
256 | /* This isn't a submount so if a forced expire |
257 | * has been requested, user space handles busy | |
258 | * mounts */ | |
259 | if (how & AUTOFS_EXP_FORCED) | |
260 | return p; | |
261 | ||
ebc921ca | 262 | /* Can we expire this guy */ |
e5c85e1f | 263 | if (autofs_can_expire(p, timeout, how)) |
ebc921ca IK |
264 | return p; |
265 | } | |
266 | } | |
267 | return NULL; | |
268 | } | |
269 | ||
270 | /* Check if we can expire a direct mount (possibly a tree) */ | |
5d30517d IK |
271 | static struct dentry *autofs_expire_direct(struct super_block *sb, |
272 | struct vfsmount *mnt, | |
273 | struct autofs_sb_info *sbi, | |
e5c85e1f | 274 | unsigned int how) |
ebc921ca | 275 | { |
ebc921ca | 276 | struct dentry *root = dget(sb->s_root); |
ebc921ca | 277 | struct autofs_info *ino; |
e5c85e1f | 278 | unsigned long timeout; |
ebc921ca IK |
279 | |
280 | if (!root) | |
281 | return NULL; | |
282 | ||
ebc921ca IK |
283 | timeout = sbi->exp_timeout; |
284 | ||
e5c85e1f | 285 | if (!autofs_direct_busy(mnt, root, timeout, how)) { |
ebc921ca IK |
286 | spin_lock(&sbi->fs_lock); |
287 | ino = autofs_dentry_ino(root); | |
288 | /* No point expiring a pending mount */ | |
289 | if (ino->flags & AUTOFS_INF_PENDING) { | |
290 | spin_unlock(&sbi->fs_lock); | |
291 | goto out; | |
292 | } | |
293 | ino->flags |= AUTOFS_INF_WANT_EXPIRE; | |
294 | spin_unlock(&sbi->fs_lock); | |
295 | synchronize_rcu(); | |
e5c85e1f | 296 | if (!autofs_direct_busy(mnt, root, timeout, how)) { |
ebc921ca IK |
297 | spin_lock(&sbi->fs_lock); |
298 | ino->flags |= AUTOFS_INF_EXPIRING; | |
299 | init_completion(&ino->expire_complete); | |
300 | spin_unlock(&sbi->fs_lock); | |
301 | return root; | |
302 | } | |
303 | spin_lock(&sbi->fs_lock); | |
304 | ino->flags &= ~AUTOFS_INF_WANT_EXPIRE; | |
305 | spin_unlock(&sbi->fs_lock); | |
306 | } | |
307 | out: | |
308 | dput(root); | |
309 | ||
310 | return NULL; | |
311 | } | |
312 | ||
313 | /* Check if 'dentry' should expire, or return a nearby | |
314 | * dentry that is suitable. | |
315 | * If returned dentry is different from arg dentry, | |
316 | * then a dget() reference was taken, else not. | |
317 | */ | |
318 | static struct dentry *should_expire(struct dentry *dentry, | |
319 | struct vfsmount *mnt, | |
320 | unsigned long timeout, | |
e5c85e1f | 321 | unsigned int how) |
ebc921ca | 322 | { |
ebc921ca IK |
323 | struct autofs_info *ino = autofs_dentry_ino(dentry); |
324 | unsigned int ino_count; | |
325 | ||
326 | /* No point expiring a pending mount */ | |
327 | if (ino->flags & AUTOFS_INF_PENDING) | |
328 | return NULL; | |
329 | ||
330 | /* | |
331 | * Case 1: (i) indirect mount or top level pseudo direct mount | |
332 | * (autofs-4.1). | |
333 | * (ii) indirect mount with offset mount, check the "/" | |
334 | * offset (autofs-5.0+). | |
335 | */ | |
336 | if (d_mountpoint(dentry)) { | |
337 | pr_debug("checking mountpoint %p %pd\n", dentry, dentry); | |
338 | ||
339 | /* Can we umount this guy */ | |
cbf6898f | 340 | if (autofs_mount_busy(mnt, dentry, how)) |
ebc921ca IK |
341 | return NULL; |
342 | ||
cbf6898f IK |
343 | /* This isn't a submount so if a forced expire |
344 | * has been requested, user space handles busy | |
345 | * mounts */ | |
346 | if (how & AUTOFS_EXP_FORCED) | |
347 | return dentry; | |
348 | ||
ebc921ca | 349 | /* Can we expire this guy */ |
e5c85e1f | 350 | if (autofs_can_expire(dentry, timeout, how)) |
ebc921ca IK |
351 | return dentry; |
352 | return NULL; | |
353 | } | |
354 | ||
eecf77e0 | 355 | if (d_is_symlink(dentry)) { |
ebc921ca | 356 | pr_debug("checking symlink %p %pd\n", dentry, dentry); |
cbf6898f IK |
357 | |
358 | /* Forced expire, user space handles busy mounts */ | |
359 | if (how & AUTOFS_EXP_FORCED) | |
360 | return dentry; | |
361 | ||
ebc921ca IK |
362 | /* |
363 | * A symlink can't be "busy" in the usual sense so | |
364 | * just check last used for expire timeout. | |
365 | */ | |
e5c85e1f | 366 | if (autofs_can_expire(dentry, timeout, how)) |
ebc921ca IK |
367 | return dentry; |
368 | return NULL; | |
369 | } | |
370 | ||
a4a87303 | 371 | if (autofs_empty(ino)) |
ebc921ca IK |
372 | return NULL; |
373 | ||
374 | /* Case 2: tree mount, expire iff entire tree is not busy */ | |
e5c85e1f | 375 | if (!(how & AUTOFS_EXP_LEAVES)) { |
cbf6898f IK |
376 | /* Not a forced expire? */ |
377 | if (!(how & AUTOFS_EXP_FORCED)) { | |
378 | /* ref-walk currently on this dentry? */ | |
850d71ac | 379 | ino_count = READ_ONCE(ino->count) + 1; |
cbf6898f IK |
380 | if (d_count(dentry) > ino_count) |
381 | return NULL; | |
382 | } | |
ebc921ca | 383 | |
e5c85e1f | 384 | if (!autofs_tree_busy(mnt, dentry, timeout, how)) |
ebc921ca IK |
385 | return dentry; |
386 | /* | |
387 | * Case 3: pseudo direct mount, expire individual leaves | |
388 | * (autofs-4.1). | |
389 | */ | |
390 | } else { | |
ebc921ca IK |
391 | struct dentry *expired; |
392 | ||
cbf6898f IK |
393 | /* Not a forced expire? */ |
394 | if (!(how & AUTOFS_EXP_FORCED)) { | |
395 | /* ref-walk currently on this dentry? */ | |
850d71ac | 396 | ino_count = READ_ONCE(ino->count) + 1; |
cbf6898f IK |
397 | if (d_count(dentry) > ino_count) |
398 | return NULL; | |
399 | } | |
ebc921ca | 400 | |
e5c85e1f | 401 | expired = autofs_check_leaves(mnt, dentry, timeout, how); |
ebc921ca IK |
402 | if (expired) { |
403 | if (expired == dentry) | |
404 | dput(dentry); | |
405 | return expired; | |
406 | } | |
407 | } | |
408 | return NULL; | |
409 | } | |
410 | ||
411 | /* | |
412 | * Find an eligible tree to time-out | |
413 | * A tree is eligible if :- | |
414 | * - it is unused by any user process | |
415 | * - it has been unused for exp_timeout time | |
416 | */ | |
571bc35c IK |
417 | static struct dentry *autofs_expire_indirect(struct super_block *sb, |
418 | struct vfsmount *mnt, | |
419 | struct autofs_sb_info *sbi, | |
e5c85e1f | 420 | unsigned int how) |
ebc921ca IK |
421 | { |
422 | unsigned long timeout; | |
423 | struct dentry *root = sb->s_root; | |
424 | struct dentry *dentry; | |
425 | struct dentry *expired; | |
426 | struct dentry *found; | |
427 | struct autofs_info *ino; | |
428 | ||
429 | if (!root) | |
430 | return NULL; | |
431 | ||
ebc921ca IK |
432 | timeout = sbi->exp_timeout; |
433 | ||
434 | dentry = NULL; | |
435 | while ((dentry = get_next_positive_subdir(dentry, root))) { | |
ebc921ca IK |
436 | spin_lock(&sbi->fs_lock); |
437 | ino = autofs_dentry_ino(dentry); | |
438 | if (ino->flags & AUTOFS_INF_WANT_EXPIRE) { | |
439 | spin_unlock(&sbi->fs_lock); | |
440 | continue; | |
441 | } | |
442 | spin_unlock(&sbi->fs_lock); | |
443 | ||
e5c85e1f | 444 | expired = should_expire(dentry, mnt, timeout, how); |
ebc921ca IK |
445 | if (!expired) |
446 | continue; | |
447 | ||
448 | spin_lock(&sbi->fs_lock); | |
449 | ino = autofs_dentry_ino(expired); | |
450 | ino->flags |= AUTOFS_INF_WANT_EXPIRE; | |
451 | spin_unlock(&sbi->fs_lock); | |
452 | synchronize_rcu(); | |
453 | ||
454 | /* Make sure a reference is not taken on found if | |
455 | * things have changed. | |
456 | */ | |
e5c85e1f IK |
457 | how &= ~AUTOFS_EXP_LEAVES; |
458 | found = should_expire(expired, mnt, timeout, how); | |
03ad0d70 AV |
459 | if (found != expired) { // something has changed, continue |
460 | dput(found); | |
ebc921ca | 461 | goto next; |
03ad0d70 | 462 | } |
ebc921ca IK |
463 | |
464 | if (expired != dentry) | |
465 | dput(dentry); | |
466 | ||
467 | spin_lock(&sbi->fs_lock); | |
468 | goto found; | |
469 | next: | |
470 | spin_lock(&sbi->fs_lock); | |
471 | ino->flags &= ~AUTOFS_INF_WANT_EXPIRE; | |
472 | spin_unlock(&sbi->fs_lock); | |
473 | if (expired != dentry) | |
474 | dput(expired); | |
475 | } | |
476 | return NULL; | |
477 | ||
478 | found: | |
479 | pr_debug("returning %p %pd\n", expired, expired); | |
480 | ino->flags |= AUTOFS_INF_EXPIRING; | |
481 | init_completion(&ino->expire_complete); | |
482 | spin_unlock(&sbi->fs_lock); | |
483 | return expired; | |
484 | } | |
485 | ||
486 | int autofs_expire_wait(const struct path *path, int rcu_walk) | |
487 | { | |
488 | struct dentry *dentry = path->dentry; | |
489 | struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb); | |
490 | struct autofs_info *ino = autofs_dentry_ino(dentry); | |
491 | int status; | |
492 | int state; | |
493 | ||
494 | /* Block on any pending expire */ | |
495 | if (!(ino->flags & AUTOFS_INF_WANT_EXPIRE)) | |
496 | return 0; | |
497 | if (rcu_walk) | |
498 | return -ECHILD; | |
499 | ||
500 | retry: | |
501 | spin_lock(&sbi->fs_lock); | |
502 | state = ino->flags & (AUTOFS_INF_WANT_EXPIRE | AUTOFS_INF_EXPIRING); | |
503 | if (state == AUTOFS_INF_WANT_EXPIRE) { | |
504 | spin_unlock(&sbi->fs_lock); | |
505 | /* | |
506 | * Possibly being selected for expire, wait until | |
507 | * it's selected or not. | |
508 | */ | |
509 | schedule_timeout_uninterruptible(HZ/10); | |
510 | goto retry; | |
511 | } | |
512 | if (state & AUTOFS_INF_EXPIRING) { | |
513 | spin_unlock(&sbi->fs_lock); | |
514 | ||
515 | pr_debug("waiting for expire %p name=%pd\n", dentry, dentry); | |
516 | ||
517 | status = autofs_wait(sbi, path, NFY_NONE); | |
518 | wait_for_completion(&ino->expire_complete); | |
519 | ||
520 | pr_debug("expire done status=%d\n", status); | |
521 | ||
522 | if (d_unhashed(dentry)) | |
523 | return -EAGAIN; | |
524 | ||
525 | return status; | |
526 | } | |
527 | spin_unlock(&sbi->fs_lock); | |
528 | ||
529 | return 0; | |
530 | } | |
531 | ||
532 | /* Perform an expiry operation */ | |
533 | int autofs_expire_run(struct super_block *sb, | |
534 | struct vfsmount *mnt, | |
535 | struct autofs_sb_info *sbi, | |
536 | struct autofs_packet_expire __user *pkt_p) | |
537 | { | |
538 | struct autofs_packet_expire pkt; | |
539 | struct autofs_info *ino; | |
540 | struct dentry *dentry; | |
541 | int ret = 0; | |
542 | ||
543 | memset(&pkt, 0, sizeof(pkt)); | |
544 | ||
545 | pkt.hdr.proto_version = sbi->version; | |
546 | pkt.hdr.type = autofs_ptype_expire; | |
547 | ||
548 | dentry = autofs_expire_indirect(sb, mnt, sbi, 0); | |
549 | if (!dentry) | |
550 | return -EAGAIN; | |
551 | ||
552 | pkt.len = dentry->d_name.len; | |
553 | memcpy(pkt.name, dentry->d_name.name, pkt.len); | |
554 | pkt.name[pkt.len] = '\0'; | |
ebc921ca IK |
555 | |
556 | if (copy_to_user(pkt_p, &pkt, sizeof(struct autofs_packet_expire))) | |
557 | ret = -EFAULT; | |
558 | ||
559 | spin_lock(&sbi->fs_lock); | |
560 | ino = autofs_dentry_ino(dentry); | |
561 | /* avoid rapid-fire expire attempts if expiry fails */ | |
2fd9944f | 562 | ino->last_used = jiffies; |
ebc921ca IK |
563 | ino->flags &= ~(AUTOFS_INF_EXPIRING|AUTOFS_INF_WANT_EXPIRE); |
564 | complete_all(&ino->expire_complete); | |
565 | spin_unlock(&sbi->fs_lock); | |
566 | ||
63ce5f55 PB |
567 | dput(dentry); |
568 | ||
ebc921ca IK |
569 | return ret; |
570 | } | |
571 | ||
572 | int autofs_do_expire_multi(struct super_block *sb, struct vfsmount *mnt, | |
e5c85e1f | 573 | struct autofs_sb_info *sbi, unsigned int how) |
ebc921ca IK |
574 | { |
575 | struct dentry *dentry; | |
576 | int ret = -EAGAIN; | |
577 | ||
578 | if (autofs_type_trigger(sbi->type)) | |
e5c85e1f | 579 | dentry = autofs_expire_direct(sb, mnt, sbi, how); |
ebc921ca | 580 | else |
e5c85e1f | 581 | dentry = autofs_expire_indirect(sb, mnt, sbi, how); |
ebc921ca IK |
582 | |
583 | if (dentry) { | |
584 | struct autofs_info *ino = autofs_dentry_ino(dentry); | |
585 | const struct path path = { .mnt = mnt, .dentry = dentry }; | |
586 | ||
587 | /* This is synchronous because it makes the daemon a | |
588 | * little easier | |
589 | */ | |
590 | ret = autofs_wait(sbi, &path, NFY_EXPIRE); | |
591 | ||
592 | spin_lock(&sbi->fs_lock); | |
593 | /* avoid rapid-fire expire attempts if expiry fails */ | |
2fd9944f | 594 | ino->last_used = jiffies; |
ebc921ca IK |
595 | ino->flags &= ~(AUTOFS_INF_EXPIRING|AUTOFS_INF_WANT_EXPIRE); |
596 | complete_all(&ino->expire_complete); | |
597 | spin_unlock(&sbi->fs_lock); | |
598 | dput(dentry); | |
599 | } | |
600 | ||
601 | return ret; | |
602 | } | |
603 | ||
604 | /* | |
605 | * Call repeatedly until it returns -EAGAIN, meaning there's nothing | |
606 | * more to be done. | |
607 | */ | |
608 | int autofs_expire_multi(struct super_block *sb, struct vfsmount *mnt, | |
609 | struct autofs_sb_info *sbi, int __user *arg) | |
610 | { | |
e5c85e1f | 611 | unsigned int how = 0; |
ebc921ca | 612 | |
e5c85e1f | 613 | if (arg && get_user(how, arg)) |
ebc921ca IK |
614 | return -EFAULT; |
615 | ||
e5c85e1f | 616 | return autofs_do_expire_multi(sb, mnt, sbi, how); |
ebc921ca | 617 | } |