Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* -*- c -*- --------------------------------------------------------------- * |
2 | * | |
3 | * linux/fs/autofs/expire.c | |
4 | * | |
5 | * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved | |
6 | * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org> | |
3a15e2ab | 7 | * Copyright 2001-2006 Ian Kent <raven@themaw.net> |
1da177e4 LT |
8 | * |
9 | * This file is part of the Linux kernel and is made available under | |
10 | * the terms of the GNU General Public License, version 2, or at your | |
11 | * option, any later version, incorporated herein by reference. | |
12 | * | |
13 | * ------------------------------------------------------------------------- */ | |
14 | ||
15 | #include "autofs_i.h" | |
16 | ||
17 | static unsigned long now; | |
18 | ||
1f5f2c30 | 19 | /* Check if a dentry can be expired */ |
1da177e4 LT |
20 | static inline int autofs4_can_expire(struct dentry *dentry, |
21 | unsigned long timeout, int do_now) | |
22 | { | |
23 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
24 | ||
25 | /* dentry in the process of being deleted */ | |
26 | if (ino == NULL) | |
27 | return 0; | |
28 | ||
1da177e4 LT |
29 | if (!do_now) { |
30 | /* Too young to die */ | |
c0ba7e51 | 31 | if (!timeout || time_after(ino->last_used + timeout, now)) |
1da177e4 LT |
32 | return 0; |
33 | ||
34 | /* update last_used here :- | |
35 | - obviously makes sense if it is in use now | |
36 | - less obviously, prevents rapid-fire expire | |
37 | attempts if expire fails the first time */ | |
38 | ino->last_used = now; | |
39 | } | |
1da177e4 LT |
40 | return 1; |
41 | } | |
42 | ||
1f5f2c30 IK |
43 | /* Check a mount point for busyness */ |
44 | static int autofs4_mount_busy(struct vfsmount *mnt, struct dentry *dentry) | |
1da177e4 | 45 | { |
e0a7aae9 | 46 | struct dentry *top = dentry; |
9393bd07 | 47 | struct path path = {.mnt = mnt, .dentry = dentry}; |
1f5f2c30 | 48 | int status = 1; |
1da177e4 LT |
49 | |
50 | DPRINTK("dentry %p %.*s", | |
51 | dentry, (int)dentry->d_name.len, dentry->d_name.name); | |
52 | ||
9393bd07 | 53 | path_get(&path); |
1da177e4 | 54 | |
cc53ce53 | 55 | if (!follow_down_one(&path)) |
1da177e4 LT |
56 | goto done; |
57 | ||
9393bd07 AV |
58 | if (is_autofs4_dentry(path.dentry)) { |
59 | struct autofs_sb_info *sbi = autofs4_sbi(path.dentry->d_sb); | |
bc9c4068 IK |
60 | |
61 | /* This is an autofs submount, we can't expire it */ | |
a92daf6b | 62 | if (autofs_type_indirect(sbi->type)) |
bc9c4068 IK |
63 | goto done; |
64 | ||
65 | /* | |
66 | * Otherwise it's an offset mount and we need to check | |
67 | * if we can umount its mount, if there is one. | |
68 | */ | |
9393bd07 | 69 | if (!d_mountpoint(path.dentry)) { |
a8985f3a | 70 | status = 0; |
bc9c4068 | 71 | goto done; |
a8985f3a | 72 | } |
bc9c4068 | 73 | } |
1da177e4 | 74 | |
e0a7aae9 | 75 | /* Update the expiry counter if fs is busy */ |
37d0892c | 76 | if (!may_umount_tree(path.mnt)) { |
e0a7aae9 IK |
77 | struct autofs_info *ino = autofs4_dentry_ino(top); |
78 | ino->last_used = jiffies; | |
79 | goto done; | |
80 | } | |
81 | ||
82 | status = 0; | |
1da177e4 LT |
83 | done: |
84 | DPRINTK("returning = %d", status); | |
9393bd07 | 85 | path_put(&path); |
1da177e4 LT |
86 | return status; |
87 | } | |
88 | ||
d4a85e35 IK |
89 | /* |
90 | * Calculate and dget next entry in the subdirs list under root. | |
91 | */ | |
92 | static struct dentry *get_next_positive_subdir(struct dentry *prev, | |
93 | struct dentry *root) | |
94 | { | |
95 | struct list_head *next; | |
96 | struct dentry *p, *q; | |
97 | ||
98 | spin_lock(&autofs4_lock); | |
99 | ||
100 | if (prev == NULL) { | |
101 | spin_lock(&root->d_lock); | |
102 | prev = dget_dlock(root); | |
103 | next = prev->d_subdirs.next; | |
104 | p = prev; | |
105 | goto start; | |
106 | } | |
107 | ||
108 | p = prev; | |
109 | spin_lock(&p->d_lock); | |
110 | again: | |
111 | next = p->d_u.d_child.next; | |
112 | start: | |
113 | if (next == &root->d_subdirs) { | |
114 | spin_unlock(&p->d_lock); | |
115 | spin_unlock(&autofs4_lock); | |
116 | dput(prev); | |
117 | return NULL; | |
118 | } | |
119 | ||
120 | q = list_entry(next, struct dentry, d_u.d_child); | |
121 | ||
122 | spin_lock_nested(&q->d_lock, DENTRY_D_LOCK_NESTED); | |
123 | /* Negative dentry - try next */ | |
124 | if (!simple_positive(q)) { | |
125 | spin_unlock(&p->d_lock); | |
126 | p = q; | |
127 | goto again; | |
128 | } | |
129 | dget_dlock(q); | |
130 | spin_unlock(&q->d_lock); | |
131 | spin_unlock(&p->d_lock); | |
132 | spin_unlock(&autofs4_lock); | |
133 | ||
134 | dput(prev); | |
135 | ||
136 | return q; | |
137 | } | |
138 | ||
1ce12bad | 139 | /* |
2fd6b7f5 | 140 | * Calculate and dget next entry in top down tree traversal. |
1ce12bad | 141 | */ |
2fd6b7f5 NP |
142 | static struct dentry *get_next_positive_dentry(struct dentry *prev, |
143 | struct dentry *root) | |
1ce12bad | 144 | { |
2fd6b7f5 NP |
145 | struct list_head *next; |
146 | struct dentry *p, *ret; | |
147 | ||
148 | if (prev == NULL) | |
c14cc63a | 149 | return dget(root); |
1ce12bad | 150 | |
b5c84bf6 | 151 | spin_lock(&autofs4_lock); |
2fd6b7f5 NP |
152 | relock: |
153 | p = prev; | |
154 | spin_lock(&p->d_lock); | |
155 | again: | |
156 | next = p->d_subdirs.next; | |
1ce12bad IK |
157 | if (next == &p->d_subdirs) { |
158 | while (1) { | |
2fd6b7f5 NP |
159 | struct dentry *parent; |
160 | ||
161 | if (p == root) { | |
162 | spin_unlock(&p->d_lock); | |
b5c84bf6 | 163 | spin_unlock(&autofs4_lock); |
2fd6b7f5 | 164 | dput(prev); |
1ce12bad | 165 | return NULL; |
2fd6b7f5 NP |
166 | } |
167 | ||
168 | parent = p->d_parent; | |
169 | if (!spin_trylock(&parent->d_lock)) { | |
170 | spin_unlock(&p->d_lock); | |
171 | cpu_relax(); | |
172 | goto relock; | |
173 | } | |
174 | spin_unlock(&p->d_lock); | |
1ce12bad | 175 | next = p->d_u.d_child.next; |
2fd6b7f5 NP |
176 | p = parent; |
177 | if (next != &parent->d_subdirs) | |
1ce12bad | 178 | break; |
1ce12bad IK |
179 | } |
180 | } | |
2fd6b7f5 NP |
181 | ret = list_entry(next, struct dentry, d_u.d_child); |
182 | ||
183 | spin_lock_nested(&ret->d_lock, DENTRY_D_LOCK_NESTED); | |
184 | /* Negative dentry - try next */ | |
185 | if (!simple_positive(ret)) { | |
c14cc63a | 186 | spin_unlock(&p->d_lock); |
2fd6b7f5 NP |
187 | p = ret; |
188 | goto again; | |
189 | } | |
190 | dget_dlock(ret); | |
191 | spin_unlock(&ret->d_lock); | |
192 | spin_unlock(&p->d_lock); | |
b5c84bf6 | 193 | spin_unlock(&autofs4_lock); |
2fd6b7f5 NP |
194 | |
195 | dput(prev); | |
196 | ||
197 | return ret; | |
1ce12bad IK |
198 | } |
199 | ||
3a15e2ab IK |
200 | /* |
201 | * Check a direct mount point for busyness. | |
202 | * Direct mounts have similar expiry semantics to tree mounts. | |
203 | * The tree is not busy iff no mountpoints are busy and there are no | |
204 | * autofs submounts. | |
205 | */ | |
206 | static int autofs4_direct_busy(struct vfsmount *mnt, | |
207 | struct dentry *top, | |
208 | unsigned long timeout, | |
209 | int do_now) | |
210 | { | |
211 | DPRINTK("top %p %.*s", | |
212 | top, (int) top->d_name.len, top->d_name.name); | |
213 | ||
3a15e2ab IK |
214 | /* If it's busy update the expiry counters */ |
215 | if (!may_umount_tree(mnt)) { | |
216 | struct autofs_info *ino = autofs4_dentry_ino(top); | |
217 | if (ino) | |
218 | ino->last_used = jiffies; | |
219 | return 1; | |
220 | } | |
221 | ||
222 | /* Timeout of a direct mount is determined by its top dentry */ | |
223 | if (!autofs4_can_expire(top, timeout, do_now)) | |
224 | return 1; | |
225 | ||
226 | return 0; | |
227 | } | |
228 | ||
1da177e4 LT |
229 | /* Check a directory tree of mount points for busyness |
230 | * The tree is not busy iff no mountpoints are busy | |
1da177e4 | 231 | */ |
1f5f2c30 IK |
232 | static int autofs4_tree_busy(struct vfsmount *mnt, |
233 | struct dentry *top, | |
234 | unsigned long timeout, | |
235 | int do_now) | |
1da177e4 | 236 | { |
e0a7aae9 | 237 | struct autofs_info *top_ino = autofs4_dentry_ino(top); |
1ce12bad | 238 | struct dentry *p; |
1da177e4 | 239 | |
1f5f2c30 | 240 | DPRINTK("top %p %.*s", |
1da177e4 LT |
241 | top, (int)top->d_name.len, top->d_name.name); |
242 | ||
243 | /* Negative dentry - give up */ | |
244 | if (!simple_positive(top)) | |
1f5f2c30 | 245 | return 1; |
1da177e4 | 246 | |
2fd6b7f5 NP |
247 | p = NULL; |
248 | while ((p = get_next_positive_dentry(p, top))) { | |
1da177e4 | 249 | DPRINTK("dentry %p %.*s", |
1ce12bad | 250 | p, (int) p->d_name.len, p->d_name.name); |
1da177e4 | 251 | |
1aff3c8b IK |
252 | /* |
253 | * Is someone visiting anywhere in the subtree ? | |
254 | * If there's no mount we need to check the usage | |
255 | * count for the autofs dentry. | |
e0a7aae9 | 256 | * If the fs is busy update the expiry counter. |
1aff3c8b | 257 | */ |
1ce12bad | 258 | if (d_mountpoint(p)) { |
1ce12bad | 259 | if (autofs4_mount_busy(mnt, p)) { |
e0a7aae9 | 260 | top_ino->last_used = jiffies; |
1ce12bad | 261 | dput(p); |
1f5f2c30 | 262 | return 1; |
1da177e4 | 263 | } |
1aff3c8b | 264 | } else { |
e0a7aae9 | 265 | struct autofs_info *ino = autofs4_dentry_ino(p); |
1aff3c8b IK |
266 | unsigned int ino_count = atomic_read(&ino->count); |
267 | ||
f9022f66 IK |
268 | /* |
269 | * Clean stale dentries below that have not been | |
270 | * invalidated after a mount fail during lookup | |
271 | */ | |
272 | d_invalidate(p); | |
273 | ||
1aff3c8b IK |
274 | /* allow for dget above and top is already dgot */ |
275 | if (p == top) | |
276 | ino_count += 2; | |
277 | else | |
278 | ino_count++; | |
279 | ||
b7ab39f6 | 280 | if (p->d_count > ino_count) { |
e0a7aae9 | 281 | top_ino->last_used = jiffies; |
1aff3c8b IK |
282 | dput(p); |
283 | return 1; | |
284 | } | |
1da177e4 | 285 | } |
1da177e4 | 286 | } |
1aff3c8b IK |
287 | |
288 | /* Timeout of a tree mount is ultimately determined by its top dentry */ | |
289 | if (!autofs4_can_expire(top, timeout, do_now)) | |
290 | return 1; | |
291 | ||
1f5f2c30 | 292 | return 0; |
1da177e4 LT |
293 | } |
294 | ||
295 | static struct dentry *autofs4_check_leaves(struct vfsmount *mnt, | |
296 | struct dentry *parent, | |
297 | unsigned long timeout, | |
298 | int do_now) | |
299 | { | |
1ce12bad | 300 | struct dentry *p; |
1da177e4 LT |
301 | |
302 | DPRINTK("parent %p %.*s", | |
303 | parent, (int)parent->d_name.len, parent->d_name.name); | |
304 | ||
2fd6b7f5 NP |
305 | p = NULL; |
306 | while ((p = get_next_positive_dentry(p, parent))) { | |
1da177e4 | 307 | DPRINTK("dentry %p %.*s", |
1ce12bad | 308 | p, (int) p->d_name.len, p->d_name.name); |
1da177e4 | 309 | |
1ce12bad | 310 | if (d_mountpoint(p)) { |
e0a7aae9 IK |
311 | /* Can we umount this guy */ |
312 | if (autofs4_mount_busy(mnt, p)) | |
2fd6b7f5 | 313 | continue; |
1da177e4 | 314 | |
e0a7aae9 IK |
315 | /* Can we expire this guy */ |
316 | if (autofs4_can_expire(p, timeout, do_now)) | |
1ce12bad | 317 | return p; |
1da177e4 | 318 | } |
1da177e4 | 319 | } |
1da177e4 LT |
320 | return NULL; |
321 | } | |
322 | ||
3a15e2ab | 323 | /* Check if we can expire a direct mount (possibly a tree) */ |
8d7b48e0 IK |
324 | struct dentry *autofs4_expire_direct(struct super_block *sb, |
325 | struct vfsmount *mnt, | |
326 | struct autofs_sb_info *sbi, | |
327 | int how) | |
3a15e2ab IK |
328 | { |
329 | unsigned long timeout; | |
330 | struct dentry *root = dget(sb->s_root); | |
331 | int do_now = how & AUTOFS_EXP_IMMEDIATE; | |
b5b80177 | 332 | struct autofs_info *ino; |
3a15e2ab | 333 | |
c0ba7e51 | 334 | if (!root) |
3a15e2ab IK |
335 | return NULL; |
336 | ||
337 | now = jiffies; | |
338 | timeout = sbi->exp_timeout; | |
339 | ||
3a15e2ab | 340 | spin_lock(&sbi->fs_lock); |
b5b80177 IK |
341 | ino = autofs4_dentry_ino(root); |
342 | /* No point expiring a pending mount */ | |
f9398c23 IK |
343 | if (ino->flags & AUTOFS_INF_PENDING) |
344 | goto out; | |
3a15e2ab IK |
345 | if (!autofs4_direct_busy(mnt, root, timeout, do_now)) { |
346 | struct autofs_info *ino = autofs4_dentry_ino(root); | |
3a15e2ab | 347 | ino->flags |= AUTOFS_INF_EXPIRING; |
6e60a9ab | 348 | init_completion(&ino->expire_complete); |
3a15e2ab IK |
349 | spin_unlock(&sbi->fs_lock); |
350 | return root; | |
351 | } | |
f9398c23 | 352 | out: |
3a15e2ab IK |
353 | spin_unlock(&sbi->fs_lock); |
354 | dput(root); | |
355 | ||
356 | return NULL; | |
357 | } | |
358 | ||
1da177e4 LT |
359 | /* |
360 | * Find an eligible tree to time-out | |
361 | * A tree is eligible if :- | |
362 | * - it is unused by any user process | |
363 | * - it has been unused for exp_timeout time | |
364 | */ | |
8d7b48e0 IK |
365 | struct dentry *autofs4_expire_indirect(struct super_block *sb, |
366 | struct vfsmount *mnt, | |
367 | struct autofs_sb_info *sbi, | |
368 | int how) | |
1da177e4 LT |
369 | { |
370 | unsigned long timeout; | |
371 | struct dentry *root = sb->s_root; | |
2fd6b7f5 | 372 | struct dentry *dentry; |
1da177e4 | 373 | struct dentry *expired = NULL; |
1da177e4 LT |
374 | int do_now = how & AUTOFS_EXP_IMMEDIATE; |
375 | int exp_leaves = how & AUTOFS_EXP_LEAVES; | |
97e7449a IK |
376 | struct autofs_info *ino; |
377 | unsigned int ino_count; | |
1da177e4 | 378 | |
c0ba7e51 | 379 | if (!root) |
1da177e4 LT |
380 | return NULL; |
381 | ||
382 | now = jiffies; | |
383 | timeout = sbi->exp_timeout; | |
384 | ||
2fd6b7f5 | 385 | dentry = NULL; |
d4a85e35 | 386 | while ((dentry = get_next_positive_subdir(dentry, root))) { |
97e7449a IK |
387 | spin_lock(&sbi->fs_lock); |
388 | ino = autofs4_dentry_ino(dentry); | |
b5b80177 IK |
389 | /* No point expiring a pending mount */ |
390 | if (ino->flags & AUTOFS_INF_PENDING) | |
3c319985 | 391 | goto next; |
97e7449a | 392 | |
3a15e2ab IK |
393 | /* |
394 | * Case 1: (i) indirect mount or top level pseudo direct mount | |
395 | * (autofs-4.1). | |
396 | * (ii) indirect mount with offset mount, check the "/" | |
397 | * offset (autofs-5.0+). | |
398 | */ | |
1da177e4 LT |
399 | if (d_mountpoint(dentry)) { |
400 | DPRINTK("checking mountpoint %p %.*s", | |
401 | dentry, (int)dentry->d_name.len, dentry->d_name.name); | |
402 | ||
97e7449a IK |
403 | /* Path walk currently on this dentry? */ |
404 | ino_count = atomic_read(&ino->count) + 2; | |
b7ab39f6 | 405 | if (dentry->d_count > ino_count) |
97e7449a IK |
406 | goto next; |
407 | ||
e0a7aae9 IK |
408 | /* Can we umount this guy */ |
409 | if (autofs4_mount_busy(mnt, dentry)) | |
1da177e4 LT |
410 | goto next; |
411 | ||
e0a7aae9 IK |
412 | /* Can we expire this guy */ |
413 | if (autofs4_can_expire(dentry, timeout, do_now)) { | |
1da177e4 | 414 | expired = dentry; |
afec570c | 415 | goto found; |
1da177e4 LT |
416 | } |
417 | goto next; | |
418 | } | |
419 | ||
1f5f2c30 | 420 | if (simple_empty(dentry)) |
1da177e4 LT |
421 | goto next; |
422 | ||
423 | /* Case 2: tree mount, expire iff entire tree is not busy */ | |
424 | if (!exp_leaves) { | |
97e7449a IK |
425 | /* Path walk currently on this dentry? */ |
426 | ino_count = atomic_read(&ino->count) + 1; | |
b7ab39f6 | 427 | if (dentry->d_count > ino_count) |
97e7449a | 428 | goto next; |
3a9720ce | 429 | |
97e7449a | 430 | if (!autofs4_tree_busy(mnt, dentry, timeout, do_now)) { |
3a9720ce | 431 | expired = dentry; |
afec570c | 432 | goto found; |
1da177e4 | 433 | } |
3a15e2ab IK |
434 | /* |
435 | * Case 3: pseudo direct mount, expire individual leaves | |
436 | * (autofs-4.1). | |
437 | */ | |
1da177e4 | 438 | } else { |
97e7449a IK |
439 | /* Path walk currently on this dentry? */ |
440 | ino_count = atomic_read(&ino->count) + 1; | |
b7ab39f6 | 441 | if (dentry->d_count > ino_count) |
97e7449a IK |
442 | goto next; |
443 | ||
1da177e4 LT |
444 | expired = autofs4_check_leaves(mnt, dentry, timeout, do_now); |
445 | if (expired) { | |
446 | dput(dentry); | |
afec570c | 447 | goto found; |
1da177e4 LT |
448 | } |
449 | } | |
450 | next: | |
97e7449a | 451 | spin_unlock(&sbi->fs_lock); |
1da177e4 | 452 | } |
1da177e4 | 453 | return NULL; |
afec570c IK |
454 | |
455 | found: | |
456 | DPRINTK("returning %p %.*s", | |
457 | expired, (int)expired->d_name.len, expired->d_name.name); | |
97e7449a IK |
458 | ino = autofs4_dentry_ino(expired); |
459 | ino->flags |= AUTOFS_INF_EXPIRING; | |
6e60a9ab | 460 | init_completion(&ino->expire_complete); |
97e7449a | 461 | spin_unlock(&sbi->fs_lock); |
b5c84bf6 | 462 | spin_lock(&autofs4_lock); |
2fd6b7f5 NP |
463 | spin_lock(&expired->d_parent->d_lock); |
464 | spin_lock_nested(&expired->d_lock, DENTRY_D_LOCK_NESTED); | |
afec570c | 465 | list_move(&expired->d_parent->d_subdirs, &expired->d_u.d_child); |
2fd6b7f5 NP |
466 | spin_unlock(&expired->d_lock); |
467 | spin_unlock(&expired->d_parent->d_lock); | |
b5c84bf6 | 468 | spin_unlock(&autofs4_lock); |
afec570c | 469 | return expired; |
1da177e4 LT |
470 | } |
471 | ||
06a35985 IK |
472 | int autofs4_expire_wait(struct dentry *dentry) |
473 | { | |
474 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
475 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
476 | int status; | |
477 | ||
478 | /* Block on any pending expire */ | |
479 | spin_lock(&sbi->fs_lock); | |
480 | if (ino->flags & AUTOFS_INF_EXPIRING) { | |
481 | spin_unlock(&sbi->fs_lock); | |
482 | ||
483 | DPRINTK("waiting for expire %p name=%.*s", | |
484 | dentry, dentry->d_name.len, dentry->d_name.name); | |
485 | ||
486 | status = autofs4_wait(sbi, dentry, NFY_NONE); | |
487 | wait_for_completion(&ino->expire_complete); | |
488 | ||
489 | DPRINTK("expire done status=%d", status); | |
490 | ||
4b1ae27a | 491 | if (d_unhashed(dentry)) |
06a35985 IK |
492 | return -EAGAIN; |
493 | ||
494 | return status; | |
495 | } | |
496 | spin_unlock(&sbi->fs_lock); | |
497 | ||
498 | return 0; | |
499 | } | |
500 | ||
1da177e4 LT |
501 | /* Perform an expiry operation */ |
502 | int autofs4_expire_run(struct super_block *sb, | |
503 | struct vfsmount *mnt, | |
504 | struct autofs_sb_info *sbi, | |
505 | struct autofs_packet_expire __user *pkt_p) | |
506 | { | |
507 | struct autofs_packet_expire pkt; | |
97e7449a | 508 | struct autofs_info *ino; |
1da177e4 | 509 | struct dentry *dentry; |
97e7449a | 510 | int ret = 0; |
1da177e4 LT |
511 | |
512 | memset(&pkt,0,sizeof pkt); | |
513 | ||
514 | pkt.hdr.proto_version = sbi->version; | |
515 | pkt.hdr.type = autofs_ptype_expire; | |
516 | ||
3a15e2ab | 517 | if ((dentry = autofs4_expire_indirect(sb, mnt, sbi, 0)) == NULL) |
1da177e4 LT |
518 | return -EAGAIN; |
519 | ||
520 | pkt.len = dentry->d_name.len; | |
521 | memcpy(pkt.name, dentry->d_name.name, pkt.len); | |
522 | pkt.name[pkt.len] = '\0'; | |
523 | dput(dentry); | |
524 | ||
525 | if ( copy_to_user(pkt_p, &pkt, sizeof(struct autofs_packet_expire)) ) | |
97e7449a | 526 | ret = -EFAULT; |
1da177e4 | 527 | |
97e7449a IK |
528 | spin_lock(&sbi->fs_lock); |
529 | ino = autofs4_dentry_ino(dentry); | |
530 | ino->flags &= ~AUTOFS_INF_EXPIRING; | |
6e60a9ab | 531 | complete_all(&ino->expire_complete); |
97e7449a IK |
532 | spin_unlock(&sbi->fs_lock); |
533 | ||
534 | return ret; | |
1da177e4 LT |
535 | } |
536 | ||
56fcef75 IK |
537 | int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt, |
538 | struct autofs_sb_info *sbi, int when) | |
1da177e4 LT |
539 | { |
540 | struct dentry *dentry; | |
541 | int ret = -EAGAIN; | |
1da177e4 | 542 | |
a92daf6b | 543 | if (autofs_type_trigger(sbi->type)) |
56fcef75 | 544 | dentry = autofs4_expire_direct(sb, mnt, sbi, when); |
3a15e2ab | 545 | else |
56fcef75 | 546 | dentry = autofs4_expire_indirect(sb, mnt, sbi, when); |
3a15e2ab IK |
547 | |
548 | if (dentry) { | |
1f5f2c30 | 549 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
1da177e4 LT |
550 | |
551 | /* This is synchronous because it makes the daemon a | |
552 | little easier */ | |
1da177e4 | 553 | ret = autofs4_wait(sbi, dentry, NFY_EXPIRE); |
6e60a9ab | 554 | |
97e7449a | 555 | spin_lock(&sbi->fs_lock); |
1f5f2c30 | 556 | ino->flags &= ~AUTOFS_INF_EXPIRING; |
b5b80177 | 557 | spin_lock(&dentry->d_lock); |
3c319985 | 558 | if (!ret) { |
b5b80177 IK |
559 | if ((IS_ROOT(dentry) || |
560 | (autofs_type_indirect(sbi->type) && | |
561 | IS_ROOT(dentry->d_parent))) && | |
562 | !(dentry->d_flags & DCACHE_NEED_AUTOMOUNT)) | |
563 | __managed_dentry_set_automount(dentry); | |
564 | } | |
565 | spin_unlock(&dentry->d_lock); | |
6e60a9ab | 566 | complete_all(&ino->expire_complete); |
97e7449a | 567 | spin_unlock(&sbi->fs_lock); |
1da177e4 LT |
568 | dput(dentry); |
569 | } | |
1f5f2c30 | 570 | |
1da177e4 LT |
571 | return ret; |
572 | } | |
573 | ||
56fcef75 IK |
574 | /* Call repeatedly until it returns -EAGAIN, meaning there's nothing |
575 | more to be done */ | |
576 | int autofs4_expire_multi(struct super_block *sb, struct vfsmount *mnt, | |
577 | struct autofs_sb_info *sbi, int __user *arg) | |
578 | { | |
579 | int do_now = 0; | |
580 | ||
581 | if (arg && get_user(do_now, arg)) | |
582 | return -EFAULT; | |
583 | ||
584 | return autofs4_do_expire_multi(sb, mnt, sbi, do_now); | |
585 | } | |
586 |