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 | ||
1ce12bad | 89 | /* |
2fd6b7f5 | 90 | * Calculate and dget next entry in top down tree traversal. |
1ce12bad | 91 | */ |
2fd6b7f5 NP |
92 | static struct dentry *get_next_positive_dentry(struct dentry *prev, |
93 | struct dentry *root) | |
1ce12bad | 94 | { |
2fd6b7f5 NP |
95 | struct list_head *next; |
96 | struct dentry *p, *ret; | |
97 | ||
98 | if (prev == NULL) | |
c14cc63a | 99 | return dget(root); |
1ce12bad | 100 | |
b5c84bf6 | 101 | spin_lock(&autofs4_lock); |
2fd6b7f5 NP |
102 | relock: |
103 | p = prev; | |
104 | spin_lock(&p->d_lock); | |
105 | again: | |
106 | next = p->d_subdirs.next; | |
1ce12bad IK |
107 | if (next == &p->d_subdirs) { |
108 | while (1) { | |
2fd6b7f5 NP |
109 | struct dentry *parent; |
110 | ||
111 | if (p == root) { | |
112 | spin_unlock(&p->d_lock); | |
b5c84bf6 | 113 | spin_unlock(&autofs4_lock); |
2fd6b7f5 | 114 | dput(prev); |
1ce12bad | 115 | return NULL; |
2fd6b7f5 NP |
116 | } |
117 | ||
118 | parent = p->d_parent; | |
119 | if (!spin_trylock(&parent->d_lock)) { | |
120 | spin_unlock(&p->d_lock); | |
121 | cpu_relax(); | |
122 | goto relock; | |
123 | } | |
124 | spin_unlock(&p->d_lock); | |
1ce12bad | 125 | next = p->d_u.d_child.next; |
2fd6b7f5 NP |
126 | p = parent; |
127 | if (next != &parent->d_subdirs) | |
1ce12bad | 128 | break; |
1ce12bad IK |
129 | } |
130 | } | |
2fd6b7f5 NP |
131 | ret = list_entry(next, struct dentry, d_u.d_child); |
132 | ||
133 | spin_lock_nested(&ret->d_lock, DENTRY_D_LOCK_NESTED); | |
134 | /* Negative dentry - try next */ | |
135 | if (!simple_positive(ret)) { | |
c14cc63a | 136 | spin_unlock(&p->d_lock); |
2fd6b7f5 NP |
137 | p = ret; |
138 | goto again; | |
139 | } | |
140 | dget_dlock(ret); | |
141 | spin_unlock(&ret->d_lock); | |
142 | spin_unlock(&p->d_lock); | |
b5c84bf6 | 143 | spin_unlock(&autofs4_lock); |
2fd6b7f5 NP |
144 | |
145 | dput(prev); | |
146 | ||
147 | return ret; | |
1ce12bad IK |
148 | } |
149 | ||
3a15e2ab IK |
150 | /* |
151 | * Check a direct mount point for busyness. | |
152 | * Direct mounts have similar expiry semantics to tree mounts. | |
153 | * The tree is not busy iff no mountpoints are busy and there are no | |
154 | * autofs submounts. | |
155 | */ | |
156 | static int autofs4_direct_busy(struct vfsmount *mnt, | |
157 | struct dentry *top, | |
158 | unsigned long timeout, | |
159 | int do_now) | |
160 | { | |
161 | DPRINTK("top %p %.*s", | |
162 | top, (int) top->d_name.len, top->d_name.name); | |
163 | ||
3a15e2ab IK |
164 | /* If it's busy update the expiry counters */ |
165 | if (!may_umount_tree(mnt)) { | |
166 | struct autofs_info *ino = autofs4_dentry_ino(top); | |
167 | if (ino) | |
168 | ino->last_used = jiffies; | |
169 | return 1; | |
170 | } | |
171 | ||
172 | /* Timeout of a direct mount is determined by its top dentry */ | |
173 | if (!autofs4_can_expire(top, timeout, do_now)) | |
174 | return 1; | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
1da177e4 LT |
179 | /* Check a directory tree of mount points for busyness |
180 | * The tree is not busy iff no mountpoints are busy | |
1da177e4 | 181 | */ |
1f5f2c30 IK |
182 | static int autofs4_tree_busy(struct vfsmount *mnt, |
183 | struct dentry *top, | |
184 | unsigned long timeout, | |
185 | int do_now) | |
1da177e4 | 186 | { |
e0a7aae9 | 187 | struct autofs_info *top_ino = autofs4_dentry_ino(top); |
1ce12bad | 188 | struct dentry *p; |
1da177e4 | 189 | |
1f5f2c30 | 190 | DPRINTK("top %p %.*s", |
1da177e4 LT |
191 | top, (int)top->d_name.len, top->d_name.name); |
192 | ||
193 | /* Negative dentry - give up */ | |
194 | if (!simple_positive(top)) | |
1f5f2c30 | 195 | return 1; |
1da177e4 | 196 | |
2fd6b7f5 NP |
197 | p = NULL; |
198 | while ((p = get_next_positive_dentry(p, top))) { | |
1da177e4 | 199 | DPRINTK("dentry %p %.*s", |
1ce12bad | 200 | p, (int) p->d_name.len, p->d_name.name); |
1da177e4 | 201 | |
1aff3c8b IK |
202 | /* |
203 | * Is someone visiting anywhere in the subtree ? | |
204 | * If there's no mount we need to check the usage | |
205 | * count for the autofs dentry. | |
e0a7aae9 | 206 | * If the fs is busy update the expiry counter. |
1aff3c8b | 207 | */ |
1ce12bad | 208 | if (d_mountpoint(p)) { |
1ce12bad | 209 | if (autofs4_mount_busy(mnt, p)) { |
e0a7aae9 | 210 | top_ino->last_used = jiffies; |
1ce12bad | 211 | dput(p); |
1f5f2c30 | 212 | return 1; |
1da177e4 | 213 | } |
1aff3c8b | 214 | } else { |
e0a7aae9 | 215 | struct autofs_info *ino = autofs4_dentry_ino(p); |
1aff3c8b IK |
216 | unsigned int ino_count = atomic_read(&ino->count); |
217 | ||
f9022f66 IK |
218 | /* |
219 | * Clean stale dentries below that have not been | |
220 | * invalidated after a mount fail during lookup | |
221 | */ | |
222 | d_invalidate(p); | |
223 | ||
1aff3c8b IK |
224 | /* allow for dget above and top is already dgot */ |
225 | if (p == top) | |
226 | ino_count += 2; | |
227 | else | |
228 | ino_count++; | |
229 | ||
b7ab39f6 | 230 | if (p->d_count > ino_count) { |
e0a7aae9 | 231 | top_ino->last_used = jiffies; |
1aff3c8b IK |
232 | dput(p); |
233 | return 1; | |
234 | } | |
1da177e4 | 235 | } |
1da177e4 | 236 | } |
1aff3c8b IK |
237 | |
238 | /* Timeout of a tree mount is ultimately determined by its top dentry */ | |
239 | if (!autofs4_can_expire(top, timeout, do_now)) | |
240 | return 1; | |
241 | ||
1f5f2c30 | 242 | return 0; |
1da177e4 LT |
243 | } |
244 | ||
245 | static struct dentry *autofs4_check_leaves(struct vfsmount *mnt, | |
246 | struct dentry *parent, | |
247 | unsigned long timeout, | |
248 | int do_now) | |
249 | { | |
1ce12bad | 250 | struct dentry *p; |
1da177e4 LT |
251 | |
252 | DPRINTK("parent %p %.*s", | |
253 | parent, (int)parent->d_name.len, parent->d_name.name); | |
254 | ||
2fd6b7f5 NP |
255 | p = NULL; |
256 | while ((p = get_next_positive_dentry(p, parent))) { | |
1da177e4 | 257 | DPRINTK("dentry %p %.*s", |
1ce12bad | 258 | p, (int) p->d_name.len, p->d_name.name); |
1da177e4 | 259 | |
1ce12bad | 260 | if (d_mountpoint(p)) { |
e0a7aae9 IK |
261 | /* Can we umount this guy */ |
262 | if (autofs4_mount_busy(mnt, p)) | |
2fd6b7f5 | 263 | continue; |
1da177e4 | 264 | |
e0a7aae9 IK |
265 | /* Can we expire this guy */ |
266 | if (autofs4_can_expire(p, timeout, do_now)) | |
1ce12bad | 267 | return p; |
1da177e4 | 268 | } |
1da177e4 | 269 | } |
1da177e4 LT |
270 | return NULL; |
271 | } | |
272 | ||
3a15e2ab | 273 | /* Check if we can expire a direct mount (possibly a tree) */ |
8d7b48e0 IK |
274 | struct dentry *autofs4_expire_direct(struct super_block *sb, |
275 | struct vfsmount *mnt, | |
276 | struct autofs_sb_info *sbi, | |
277 | int how) | |
3a15e2ab IK |
278 | { |
279 | unsigned long timeout; | |
280 | struct dentry *root = dget(sb->s_root); | |
281 | int do_now = how & AUTOFS_EXP_IMMEDIATE; | |
b5b80177 | 282 | struct autofs_info *ino; |
3a15e2ab | 283 | |
c0ba7e51 | 284 | if (!root) |
3a15e2ab IK |
285 | return NULL; |
286 | ||
287 | now = jiffies; | |
288 | timeout = sbi->exp_timeout; | |
289 | ||
3a15e2ab | 290 | spin_lock(&sbi->fs_lock); |
b5b80177 IK |
291 | ino = autofs4_dentry_ino(root); |
292 | /* No point expiring a pending mount */ | |
f9398c23 IK |
293 | if (ino->flags & AUTOFS_INF_PENDING) |
294 | goto out; | |
3a15e2ab IK |
295 | if (!autofs4_direct_busy(mnt, root, timeout, do_now)) { |
296 | struct autofs_info *ino = autofs4_dentry_ino(root); | |
3a15e2ab | 297 | ino->flags |= AUTOFS_INF_EXPIRING; |
6e60a9ab | 298 | init_completion(&ino->expire_complete); |
3a15e2ab IK |
299 | spin_unlock(&sbi->fs_lock); |
300 | return root; | |
301 | } | |
f9398c23 | 302 | out: |
3a15e2ab IK |
303 | spin_unlock(&sbi->fs_lock); |
304 | dput(root); | |
305 | ||
306 | return NULL; | |
307 | } | |
308 | ||
1da177e4 LT |
309 | /* |
310 | * Find an eligible tree to time-out | |
311 | * A tree is eligible if :- | |
312 | * - it is unused by any user process | |
313 | * - it has been unused for exp_timeout time | |
314 | */ | |
8d7b48e0 IK |
315 | struct dentry *autofs4_expire_indirect(struct super_block *sb, |
316 | struct vfsmount *mnt, | |
317 | struct autofs_sb_info *sbi, | |
318 | int how) | |
1da177e4 LT |
319 | { |
320 | unsigned long timeout; | |
321 | struct dentry *root = sb->s_root; | |
2fd6b7f5 | 322 | struct dentry *dentry; |
1da177e4 | 323 | struct dentry *expired = NULL; |
1da177e4 LT |
324 | int do_now = how & AUTOFS_EXP_IMMEDIATE; |
325 | int exp_leaves = how & AUTOFS_EXP_LEAVES; | |
97e7449a IK |
326 | struct autofs_info *ino; |
327 | unsigned int ino_count; | |
1da177e4 | 328 | |
c0ba7e51 | 329 | if (!root) |
1da177e4 LT |
330 | return NULL; |
331 | ||
332 | now = jiffies; | |
333 | timeout = sbi->exp_timeout; | |
334 | ||
2fd6b7f5 NP |
335 | dentry = NULL; |
336 | while ((dentry = get_next_positive_dentry(dentry, root))) { | |
97e7449a IK |
337 | spin_lock(&sbi->fs_lock); |
338 | ino = autofs4_dentry_ino(dentry); | |
b5b80177 IK |
339 | /* No point expiring a pending mount */ |
340 | if (ino->flags & AUTOFS_INF_PENDING) | |
3c319985 | 341 | goto next; |
97e7449a | 342 | |
3a15e2ab IK |
343 | /* |
344 | * Case 1: (i) indirect mount or top level pseudo direct mount | |
345 | * (autofs-4.1). | |
346 | * (ii) indirect mount with offset mount, check the "/" | |
347 | * offset (autofs-5.0+). | |
348 | */ | |
1da177e4 LT |
349 | if (d_mountpoint(dentry)) { |
350 | DPRINTK("checking mountpoint %p %.*s", | |
351 | dentry, (int)dentry->d_name.len, dentry->d_name.name); | |
352 | ||
97e7449a IK |
353 | /* Path walk currently on this dentry? */ |
354 | ino_count = atomic_read(&ino->count) + 2; | |
b7ab39f6 | 355 | if (dentry->d_count > ino_count) |
97e7449a IK |
356 | goto next; |
357 | ||
e0a7aae9 IK |
358 | /* Can we umount this guy */ |
359 | if (autofs4_mount_busy(mnt, dentry)) | |
1da177e4 LT |
360 | goto next; |
361 | ||
e0a7aae9 IK |
362 | /* Can we expire this guy */ |
363 | if (autofs4_can_expire(dentry, timeout, do_now)) { | |
1da177e4 | 364 | expired = dentry; |
afec570c | 365 | goto found; |
1da177e4 LT |
366 | } |
367 | goto next; | |
368 | } | |
369 | ||
1f5f2c30 | 370 | if (simple_empty(dentry)) |
1da177e4 LT |
371 | goto next; |
372 | ||
373 | /* Case 2: tree mount, expire iff entire tree is not busy */ | |
374 | if (!exp_leaves) { | |
97e7449a IK |
375 | /* Path walk currently on this dentry? */ |
376 | ino_count = atomic_read(&ino->count) + 1; | |
b7ab39f6 | 377 | if (dentry->d_count > ino_count) |
97e7449a | 378 | goto next; |
3a9720ce | 379 | |
97e7449a | 380 | if (!autofs4_tree_busy(mnt, dentry, timeout, do_now)) { |
3a9720ce | 381 | expired = dentry; |
afec570c | 382 | goto found; |
1da177e4 | 383 | } |
3a15e2ab IK |
384 | /* |
385 | * Case 3: pseudo direct mount, expire individual leaves | |
386 | * (autofs-4.1). | |
387 | */ | |
1da177e4 | 388 | } else { |
97e7449a IK |
389 | /* Path walk currently on this dentry? */ |
390 | ino_count = atomic_read(&ino->count) + 1; | |
b7ab39f6 | 391 | if (dentry->d_count > ino_count) |
97e7449a IK |
392 | goto next; |
393 | ||
1da177e4 LT |
394 | expired = autofs4_check_leaves(mnt, dentry, timeout, do_now); |
395 | if (expired) { | |
396 | dput(dentry); | |
afec570c | 397 | goto found; |
1da177e4 LT |
398 | } |
399 | } | |
400 | next: | |
97e7449a | 401 | spin_unlock(&sbi->fs_lock); |
1da177e4 | 402 | } |
1da177e4 | 403 | return NULL; |
afec570c IK |
404 | |
405 | found: | |
406 | DPRINTK("returning %p %.*s", | |
407 | expired, (int)expired->d_name.len, expired->d_name.name); | |
97e7449a IK |
408 | ino = autofs4_dentry_ino(expired); |
409 | ino->flags |= AUTOFS_INF_EXPIRING; | |
6e60a9ab | 410 | init_completion(&ino->expire_complete); |
97e7449a | 411 | spin_unlock(&sbi->fs_lock); |
b5c84bf6 | 412 | spin_lock(&autofs4_lock); |
2fd6b7f5 NP |
413 | spin_lock(&expired->d_parent->d_lock); |
414 | spin_lock_nested(&expired->d_lock, DENTRY_D_LOCK_NESTED); | |
afec570c | 415 | list_move(&expired->d_parent->d_subdirs, &expired->d_u.d_child); |
2fd6b7f5 NP |
416 | spin_unlock(&expired->d_lock); |
417 | spin_unlock(&expired->d_parent->d_lock); | |
b5c84bf6 | 418 | spin_unlock(&autofs4_lock); |
afec570c | 419 | return expired; |
1da177e4 LT |
420 | } |
421 | ||
06a35985 IK |
422 | int autofs4_expire_wait(struct dentry *dentry) |
423 | { | |
424 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
425 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
426 | int status; | |
427 | ||
428 | /* Block on any pending expire */ | |
429 | spin_lock(&sbi->fs_lock); | |
430 | if (ino->flags & AUTOFS_INF_EXPIRING) { | |
431 | spin_unlock(&sbi->fs_lock); | |
432 | ||
433 | DPRINTK("waiting for expire %p name=%.*s", | |
434 | dentry, dentry->d_name.len, dentry->d_name.name); | |
435 | ||
436 | status = autofs4_wait(sbi, dentry, NFY_NONE); | |
437 | wait_for_completion(&ino->expire_complete); | |
438 | ||
439 | DPRINTK("expire done status=%d", status); | |
440 | ||
4b1ae27a | 441 | if (d_unhashed(dentry)) |
06a35985 IK |
442 | return -EAGAIN; |
443 | ||
444 | return status; | |
445 | } | |
446 | spin_unlock(&sbi->fs_lock); | |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
1da177e4 LT |
451 | /* Perform an expiry operation */ |
452 | int autofs4_expire_run(struct super_block *sb, | |
453 | struct vfsmount *mnt, | |
454 | struct autofs_sb_info *sbi, | |
455 | struct autofs_packet_expire __user *pkt_p) | |
456 | { | |
457 | struct autofs_packet_expire pkt; | |
97e7449a | 458 | struct autofs_info *ino; |
1da177e4 | 459 | struct dentry *dentry; |
97e7449a | 460 | int ret = 0; |
1da177e4 LT |
461 | |
462 | memset(&pkt,0,sizeof pkt); | |
463 | ||
464 | pkt.hdr.proto_version = sbi->version; | |
465 | pkt.hdr.type = autofs_ptype_expire; | |
466 | ||
3a15e2ab | 467 | if ((dentry = autofs4_expire_indirect(sb, mnt, sbi, 0)) == NULL) |
1da177e4 LT |
468 | return -EAGAIN; |
469 | ||
470 | pkt.len = dentry->d_name.len; | |
471 | memcpy(pkt.name, dentry->d_name.name, pkt.len); | |
472 | pkt.name[pkt.len] = '\0'; | |
473 | dput(dentry); | |
474 | ||
475 | if ( copy_to_user(pkt_p, &pkt, sizeof(struct autofs_packet_expire)) ) | |
97e7449a | 476 | ret = -EFAULT; |
1da177e4 | 477 | |
97e7449a IK |
478 | spin_lock(&sbi->fs_lock); |
479 | ino = autofs4_dentry_ino(dentry); | |
480 | ino->flags &= ~AUTOFS_INF_EXPIRING; | |
6e60a9ab | 481 | complete_all(&ino->expire_complete); |
97e7449a IK |
482 | spin_unlock(&sbi->fs_lock); |
483 | ||
484 | return ret; | |
1da177e4 LT |
485 | } |
486 | ||
56fcef75 IK |
487 | int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt, |
488 | struct autofs_sb_info *sbi, int when) | |
1da177e4 LT |
489 | { |
490 | struct dentry *dentry; | |
491 | int ret = -EAGAIN; | |
1da177e4 | 492 | |
a92daf6b | 493 | if (autofs_type_trigger(sbi->type)) |
56fcef75 | 494 | dentry = autofs4_expire_direct(sb, mnt, sbi, when); |
3a15e2ab | 495 | else |
56fcef75 | 496 | dentry = autofs4_expire_indirect(sb, mnt, sbi, when); |
3a15e2ab IK |
497 | |
498 | if (dentry) { | |
1f5f2c30 | 499 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
1da177e4 LT |
500 | |
501 | /* This is synchronous because it makes the daemon a | |
502 | little easier */ | |
1da177e4 | 503 | ret = autofs4_wait(sbi, dentry, NFY_EXPIRE); |
6e60a9ab | 504 | |
97e7449a | 505 | spin_lock(&sbi->fs_lock); |
1f5f2c30 | 506 | ino->flags &= ~AUTOFS_INF_EXPIRING; |
b5b80177 | 507 | spin_lock(&dentry->d_lock); |
3c319985 | 508 | if (!ret) { |
b5b80177 IK |
509 | if ((IS_ROOT(dentry) || |
510 | (autofs_type_indirect(sbi->type) && | |
511 | IS_ROOT(dentry->d_parent))) && | |
512 | !(dentry->d_flags & DCACHE_NEED_AUTOMOUNT)) | |
513 | __managed_dentry_set_automount(dentry); | |
514 | } | |
515 | spin_unlock(&dentry->d_lock); | |
6e60a9ab | 516 | complete_all(&ino->expire_complete); |
97e7449a | 517 | spin_unlock(&sbi->fs_lock); |
1da177e4 LT |
518 | dput(dentry); |
519 | } | |
1f5f2c30 | 520 | |
1da177e4 LT |
521 | return ret; |
522 | } | |
523 | ||
56fcef75 IK |
524 | /* Call repeatedly until it returns -EAGAIN, meaning there's nothing |
525 | more to be done */ | |
526 | int autofs4_expire_multi(struct super_block *sb, struct vfsmount *mnt, | |
527 | struct autofs_sb_info *sbi, int __user *arg) | |
528 | { | |
529 | int do_now = 0; | |
530 | ||
531 | if (arg && get_user(do_now, arg)) | |
532 | return -EFAULT; | |
533 | ||
534 | return autofs4_do_expire_multi(sb, mnt, sbi, do_now); | |
535 | } | |
536 |