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 | ||
29 | /* No point expiring a pending mount */ | |
aa952eb2 | 30 | if (ino->flags & AUTOFS_INF_PENDING) |
1da177e4 LT |
31 | return 0; |
32 | ||
33 | if (!do_now) { | |
34 | /* Too young to die */ | |
c0ba7e51 | 35 | if (!timeout || time_after(ino->last_used + timeout, now)) |
1da177e4 LT |
36 | return 0; |
37 | ||
38 | /* update last_used here :- | |
39 | - obviously makes sense if it is in use now | |
40 | - less obviously, prevents rapid-fire expire | |
41 | attempts if expire fails the first time */ | |
42 | ino->last_used = now; | |
43 | } | |
1da177e4 LT |
44 | return 1; |
45 | } | |
46 | ||
1f5f2c30 IK |
47 | /* Check a mount point for busyness */ |
48 | static int autofs4_mount_busy(struct vfsmount *mnt, struct dentry *dentry) | |
1da177e4 | 49 | { |
e0a7aae9 | 50 | struct dentry *top = dentry; |
9393bd07 | 51 | struct path path = {.mnt = mnt, .dentry = dentry}; |
1f5f2c30 | 52 | int status = 1; |
1da177e4 LT |
53 | |
54 | DPRINTK("dentry %p %.*s", | |
55 | dentry, (int)dentry->d_name.len, dentry->d_name.name); | |
56 | ||
9393bd07 | 57 | path_get(&path); |
1da177e4 | 58 | |
9393bd07 | 59 | if (!follow_down(&path)) |
1da177e4 LT |
60 | goto done; |
61 | ||
9393bd07 AV |
62 | if (is_autofs4_dentry(path.dentry)) { |
63 | struct autofs_sb_info *sbi = autofs4_sbi(path.dentry->d_sb); | |
bc9c4068 IK |
64 | |
65 | /* This is an autofs submount, we can't expire it */ | |
a92daf6b | 66 | if (autofs_type_indirect(sbi->type)) |
bc9c4068 IK |
67 | goto done; |
68 | ||
69 | /* | |
70 | * Otherwise it's an offset mount and we need to check | |
71 | * if we can umount its mount, if there is one. | |
72 | */ | |
9393bd07 | 73 | if (!d_mountpoint(path.dentry)) { |
a8985f3a | 74 | status = 0; |
bc9c4068 | 75 | goto done; |
a8985f3a | 76 | } |
bc9c4068 | 77 | } |
1da177e4 | 78 | |
e0a7aae9 | 79 | /* Update the expiry counter if fs is busy */ |
37d0892c | 80 | if (!may_umount_tree(path.mnt)) { |
e0a7aae9 IK |
81 | struct autofs_info *ino = autofs4_dentry_ino(top); |
82 | ino->last_used = jiffies; | |
83 | goto done; | |
84 | } | |
85 | ||
86 | status = 0; | |
1da177e4 LT |
87 | done: |
88 | DPRINTK("returning = %d", status); | |
9393bd07 | 89 | path_put(&path); |
1da177e4 LT |
90 | return status; |
91 | } | |
92 | ||
1ce12bad IK |
93 | /* |
94 | * Calculate next entry in top down tree traversal. | |
95 | * From next_mnt in namespace.c - elegant. | |
96 | */ | |
97 | static struct dentry *next_dentry(struct dentry *p, struct dentry *root) | |
98 | { | |
99 | struct list_head *next = p->d_subdirs.next; | |
100 | ||
101 | if (next == &p->d_subdirs) { | |
102 | while (1) { | |
103 | if (p == root) | |
104 | return NULL; | |
105 | next = p->d_u.d_child.next; | |
106 | if (next != &p->d_parent->d_subdirs) | |
107 | break; | |
108 | p = p->d_parent; | |
109 | } | |
110 | } | |
111 | return list_entry(next, struct dentry, d_u.d_child); | |
112 | } | |
113 | ||
3a15e2ab IK |
114 | /* |
115 | * Check a direct mount point for busyness. | |
116 | * Direct mounts have similar expiry semantics to tree mounts. | |
117 | * The tree is not busy iff no mountpoints are busy and there are no | |
118 | * autofs submounts. | |
119 | */ | |
120 | static int autofs4_direct_busy(struct vfsmount *mnt, | |
121 | struct dentry *top, | |
122 | unsigned long timeout, | |
123 | int do_now) | |
124 | { | |
125 | DPRINTK("top %p %.*s", | |
126 | top, (int) top->d_name.len, top->d_name.name); | |
127 | ||
3a15e2ab IK |
128 | /* If it's busy update the expiry counters */ |
129 | if (!may_umount_tree(mnt)) { | |
130 | struct autofs_info *ino = autofs4_dentry_ino(top); | |
131 | if (ino) | |
132 | ino->last_used = jiffies; | |
133 | return 1; | |
134 | } | |
135 | ||
136 | /* Timeout of a direct mount is determined by its top dentry */ | |
137 | if (!autofs4_can_expire(top, timeout, do_now)) | |
138 | return 1; | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
1da177e4 LT |
143 | /* Check a directory tree of mount points for busyness |
144 | * The tree is not busy iff no mountpoints are busy | |
1da177e4 | 145 | */ |
1f5f2c30 IK |
146 | static int autofs4_tree_busy(struct vfsmount *mnt, |
147 | struct dentry *top, | |
148 | unsigned long timeout, | |
149 | int do_now) | |
1da177e4 | 150 | { |
e0a7aae9 | 151 | struct autofs_info *top_ino = autofs4_dentry_ino(top); |
1ce12bad | 152 | struct dentry *p; |
1da177e4 | 153 | |
1f5f2c30 | 154 | DPRINTK("top %p %.*s", |
1da177e4 LT |
155 | top, (int)top->d_name.len, top->d_name.name); |
156 | ||
157 | /* Negative dentry - give up */ | |
158 | if (!simple_positive(top)) | |
1f5f2c30 | 159 | return 1; |
1da177e4 | 160 | |
1da177e4 | 161 | spin_lock(&dcache_lock); |
1ce12bad | 162 | for (p = top; p; p = next_dentry(p, top)) { |
1da177e4 | 163 | /* Negative dentry - give up */ |
1ce12bad | 164 | if (!simple_positive(p)) |
1da177e4 | 165 | continue; |
1da177e4 LT |
166 | |
167 | DPRINTK("dentry %p %.*s", | |
1ce12bad | 168 | p, (int) p->d_name.len, p->d_name.name); |
1da177e4 | 169 | |
1ce12bad | 170 | p = dget(p); |
1da177e4 LT |
171 | spin_unlock(&dcache_lock); |
172 | ||
1aff3c8b IK |
173 | /* |
174 | * Is someone visiting anywhere in the subtree ? | |
175 | * If there's no mount we need to check the usage | |
176 | * count for the autofs dentry. | |
e0a7aae9 | 177 | * If the fs is busy update the expiry counter. |
1aff3c8b | 178 | */ |
1ce12bad | 179 | if (d_mountpoint(p)) { |
1ce12bad | 180 | if (autofs4_mount_busy(mnt, p)) { |
e0a7aae9 | 181 | top_ino->last_used = jiffies; |
1ce12bad | 182 | dput(p); |
1f5f2c30 | 183 | return 1; |
1da177e4 | 184 | } |
1aff3c8b | 185 | } else { |
e0a7aae9 | 186 | struct autofs_info *ino = autofs4_dentry_ino(p); |
1aff3c8b IK |
187 | unsigned int ino_count = atomic_read(&ino->count); |
188 | ||
f9022f66 IK |
189 | /* |
190 | * Clean stale dentries below that have not been | |
191 | * invalidated after a mount fail during lookup | |
192 | */ | |
193 | d_invalidate(p); | |
194 | ||
1aff3c8b IK |
195 | /* allow for dget above and top is already dgot */ |
196 | if (p == top) | |
197 | ino_count += 2; | |
198 | else | |
199 | ino_count++; | |
200 | ||
201 | if (atomic_read(&p->d_count) > ino_count) { | |
e0a7aae9 | 202 | top_ino->last_used = jiffies; |
1aff3c8b IK |
203 | dput(p); |
204 | return 1; | |
205 | } | |
1da177e4 | 206 | } |
1ce12bad | 207 | dput(p); |
1da177e4 | 208 | spin_lock(&dcache_lock); |
1da177e4 LT |
209 | } |
210 | spin_unlock(&dcache_lock); | |
1aff3c8b IK |
211 | |
212 | /* Timeout of a tree mount is ultimately determined by its top dentry */ | |
213 | if (!autofs4_can_expire(top, timeout, do_now)) | |
214 | return 1; | |
215 | ||
1f5f2c30 | 216 | return 0; |
1da177e4 LT |
217 | } |
218 | ||
219 | static struct dentry *autofs4_check_leaves(struct vfsmount *mnt, | |
220 | struct dentry *parent, | |
221 | unsigned long timeout, | |
222 | int do_now) | |
223 | { | |
1ce12bad | 224 | struct dentry *p; |
1da177e4 LT |
225 | |
226 | DPRINTK("parent %p %.*s", | |
227 | parent, (int)parent->d_name.len, parent->d_name.name); | |
228 | ||
229 | spin_lock(&dcache_lock); | |
1ce12bad | 230 | for (p = parent; p; p = next_dentry(p, parent)) { |
1da177e4 | 231 | /* Negative dentry - give up */ |
1ce12bad | 232 | if (!simple_positive(p)) |
1da177e4 | 233 | continue; |
1da177e4 LT |
234 | |
235 | DPRINTK("dentry %p %.*s", | |
1ce12bad | 236 | p, (int) p->d_name.len, p->d_name.name); |
1da177e4 | 237 | |
1ce12bad | 238 | p = dget(p); |
1da177e4 LT |
239 | spin_unlock(&dcache_lock); |
240 | ||
1ce12bad | 241 | if (d_mountpoint(p)) { |
e0a7aae9 IK |
242 | /* Can we umount this guy */ |
243 | if (autofs4_mount_busy(mnt, p)) | |
1da177e4 LT |
244 | goto cont; |
245 | ||
e0a7aae9 IK |
246 | /* Can we expire this guy */ |
247 | if (autofs4_can_expire(p, timeout, do_now)) | |
1ce12bad | 248 | return p; |
1da177e4 LT |
249 | } |
250 | cont: | |
1ce12bad | 251 | dput(p); |
1da177e4 | 252 | spin_lock(&dcache_lock); |
1da177e4 LT |
253 | } |
254 | spin_unlock(&dcache_lock); | |
1da177e4 LT |
255 | return NULL; |
256 | } | |
257 | ||
3a15e2ab | 258 | /* Check if we can expire a direct mount (possibly a tree) */ |
8d7b48e0 IK |
259 | struct dentry *autofs4_expire_direct(struct super_block *sb, |
260 | struct vfsmount *mnt, | |
261 | struct autofs_sb_info *sbi, | |
262 | int how) | |
3a15e2ab IK |
263 | { |
264 | unsigned long timeout; | |
265 | struct dentry *root = dget(sb->s_root); | |
266 | int do_now = how & AUTOFS_EXP_IMMEDIATE; | |
267 | ||
c0ba7e51 | 268 | if (!root) |
3a15e2ab IK |
269 | return NULL; |
270 | ||
271 | now = jiffies; | |
272 | timeout = sbi->exp_timeout; | |
273 | ||
3a15e2ab IK |
274 | spin_lock(&sbi->fs_lock); |
275 | if (!autofs4_direct_busy(mnt, root, timeout, do_now)) { | |
276 | struct autofs_info *ino = autofs4_dentry_ino(root); | |
6e60a9ab IK |
277 | if (d_mountpoint(root)) { |
278 | ino->flags |= AUTOFS_INF_MOUNTPOINT; | |
279 | root->d_mounted--; | |
280 | } | |
3a15e2ab | 281 | ino->flags |= AUTOFS_INF_EXPIRING; |
213614d5 | 282 | autofs4_add_expiring(root); |
6e60a9ab | 283 | init_completion(&ino->expire_complete); |
3a15e2ab IK |
284 | spin_unlock(&sbi->fs_lock); |
285 | return root; | |
286 | } | |
287 | spin_unlock(&sbi->fs_lock); | |
288 | dput(root); | |
289 | ||
290 | return NULL; | |
291 | } | |
292 | ||
1da177e4 LT |
293 | /* |
294 | * Find an eligible tree to time-out | |
295 | * A tree is eligible if :- | |
296 | * - it is unused by any user process | |
297 | * - it has been unused for exp_timeout time | |
298 | */ | |
8d7b48e0 IK |
299 | struct dentry *autofs4_expire_indirect(struct super_block *sb, |
300 | struct vfsmount *mnt, | |
301 | struct autofs_sb_info *sbi, | |
302 | int how) | |
1da177e4 LT |
303 | { |
304 | unsigned long timeout; | |
305 | struct dentry *root = sb->s_root; | |
306 | struct dentry *expired = NULL; | |
307 | struct list_head *next; | |
308 | int do_now = how & AUTOFS_EXP_IMMEDIATE; | |
309 | int exp_leaves = how & AUTOFS_EXP_LEAVES; | |
97e7449a IK |
310 | struct autofs_info *ino; |
311 | unsigned int ino_count; | |
1da177e4 | 312 | |
c0ba7e51 | 313 | if (!root) |
1da177e4 LT |
314 | return NULL; |
315 | ||
316 | now = jiffies; | |
317 | timeout = sbi->exp_timeout; | |
318 | ||
319 | spin_lock(&dcache_lock); | |
320 | next = root->d_subdirs.next; | |
321 | ||
322 | /* On exit from the loop expire is set to a dgot dentry | |
323 | * to expire or it's NULL */ | |
324 | while ( next != &root->d_subdirs ) { | |
5160ee6f | 325 | struct dentry *dentry = list_entry(next, struct dentry, d_u.d_child); |
1da177e4 LT |
326 | |
327 | /* Negative dentry - give up */ | |
1f5f2c30 | 328 | if (!simple_positive(dentry)) { |
1da177e4 LT |
329 | next = next->next; |
330 | continue; | |
331 | } | |
332 | ||
333 | dentry = dget(dentry); | |
334 | spin_unlock(&dcache_lock); | |
335 | ||
97e7449a IK |
336 | spin_lock(&sbi->fs_lock); |
337 | ino = autofs4_dentry_ino(dentry); | |
338 | ||
3a15e2ab IK |
339 | /* |
340 | * Case 1: (i) indirect mount or top level pseudo direct mount | |
341 | * (autofs-4.1). | |
342 | * (ii) indirect mount with offset mount, check the "/" | |
343 | * offset (autofs-5.0+). | |
344 | */ | |
1da177e4 LT |
345 | if (d_mountpoint(dentry)) { |
346 | DPRINTK("checking mountpoint %p %.*s", | |
347 | dentry, (int)dentry->d_name.len, dentry->d_name.name); | |
348 | ||
97e7449a IK |
349 | /* Path walk currently on this dentry? */ |
350 | ino_count = atomic_read(&ino->count) + 2; | |
351 | if (atomic_read(&dentry->d_count) > ino_count) | |
352 | goto next; | |
353 | ||
e0a7aae9 IK |
354 | /* Can we umount this guy */ |
355 | if (autofs4_mount_busy(mnt, dentry)) | |
1da177e4 LT |
356 | goto next; |
357 | ||
e0a7aae9 IK |
358 | /* Can we expire this guy */ |
359 | if (autofs4_can_expire(dentry, timeout, do_now)) { | |
1da177e4 | 360 | expired = dentry; |
afec570c | 361 | goto found; |
1da177e4 LT |
362 | } |
363 | goto next; | |
364 | } | |
365 | ||
1f5f2c30 | 366 | if (simple_empty(dentry)) |
1da177e4 LT |
367 | goto next; |
368 | ||
369 | /* Case 2: tree mount, expire iff entire tree is not busy */ | |
370 | if (!exp_leaves) { | |
97e7449a IK |
371 | /* Path walk currently on this dentry? */ |
372 | ino_count = atomic_read(&ino->count) + 1; | |
373 | if (atomic_read(&dentry->d_count) > ino_count) | |
374 | goto next; | |
3a9720ce | 375 | |
97e7449a | 376 | if (!autofs4_tree_busy(mnt, dentry, timeout, do_now)) { |
3a9720ce | 377 | expired = dentry; |
afec570c | 378 | goto found; |
1da177e4 | 379 | } |
3a15e2ab IK |
380 | /* |
381 | * Case 3: pseudo direct mount, expire individual leaves | |
382 | * (autofs-4.1). | |
383 | */ | |
1da177e4 | 384 | } else { |
97e7449a IK |
385 | /* Path walk currently on this dentry? */ |
386 | ino_count = atomic_read(&ino->count) + 1; | |
387 | if (atomic_read(&dentry->d_count) > ino_count) | |
388 | goto next; | |
389 | ||
1da177e4 LT |
390 | expired = autofs4_check_leaves(mnt, dentry, timeout, do_now); |
391 | if (expired) { | |
392 | dput(dentry); | |
afec570c | 393 | goto found; |
1da177e4 LT |
394 | } |
395 | } | |
396 | next: | |
97e7449a | 397 | spin_unlock(&sbi->fs_lock); |
1da177e4 LT |
398 | dput(dentry); |
399 | spin_lock(&dcache_lock); | |
400 | next = next->next; | |
401 | } | |
1da177e4 | 402 | spin_unlock(&dcache_lock); |
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; | |
213614d5 | 410 | autofs4_add_expiring(expired); |
6e60a9ab | 411 | init_completion(&ino->expire_complete); |
97e7449a | 412 | spin_unlock(&sbi->fs_lock); |
afec570c IK |
413 | spin_lock(&dcache_lock); |
414 | list_move(&expired->d_parent->d_subdirs, &expired->d_u.d_child); | |
415 | spin_unlock(&dcache_lock); | |
416 | return expired; | |
1da177e4 LT |
417 | } |
418 | ||
06a35985 IK |
419 | int autofs4_expire_wait(struct dentry *dentry) |
420 | { | |
421 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
422 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
423 | int status; | |
424 | ||
425 | /* Block on any pending expire */ | |
426 | spin_lock(&sbi->fs_lock); | |
427 | if (ino->flags & AUTOFS_INF_EXPIRING) { | |
428 | spin_unlock(&sbi->fs_lock); | |
429 | ||
430 | DPRINTK("waiting for expire %p name=%.*s", | |
431 | dentry, dentry->d_name.len, dentry->d_name.name); | |
432 | ||
433 | status = autofs4_wait(sbi, dentry, NFY_NONE); | |
434 | wait_for_completion(&ino->expire_complete); | |
435 | ||
436 | DPRINTK("expire done status=%d", status); | |
437 | ||
213614d5 | 438 | if (d_unhashed(dentry) && IS_DEADDIR(dentry->d_inode)) |
06a35985 IK |
439 | return -EAGAIN; |
440 | ||
441 | return status; | |
442 | } | |
443 | spin_unlock(&sbi->fs_lock); | |
444 | ||
445 | return 0; | |
446 | } | |
447 | ||
1da177e4 LT |
448 | /* Perform an expiry operation */ |
449 | int autofs4_expire_run(struct super_block *sb, | |
450 | struct vfsmount *mnt, | |
451 | struct autofs_sb_info *sbi, | |
452 | struct autofs_packet_expire __user *pkt_p) | |
453 | { | |
454 | struct autofs_packet_expire pkt; | |
97e7449a | 455 | struct autofs_info *ino; |
1da177e4 | 456 | struct dentry *dentry; |
97e7449a | 457 | int ret = 0; |
1da177e4 LT |
458 | |
459 | memset(&pkt,0,sizeof pkt); | |
460 | ||
461 | pkt.hdr.proto_version = sbi->version; | |
462 | pkt.hdr.type = autofs_ptype_expire; | |
463 | ||
3a15e2ab | 464 | if ((dentry = autofs4_expire_indirect(sb, mnt, sbi, 0)) == NULL) |
1da177e4 LT |
465 | return -EAGAIN; |
466 | ||
467 | pkt.len = dentry->d_name.len; | |
468 | memcpy(pkt.name, dentry->d_name.name, pkt.len); | |
469 | pkt.name[pkt.len] = '\0'; | |
470 | dput(dentry); | |
471 | ||
472 | if ( copy_to_user(pkt_p, &pkt, sizeof(struct autofs_packet_expire)) ) | |
97e7449a | 473 | ret = -EFAULT; |
1da177e4 | 474 | |
97e7449a IK |
475 | spin_lock(&sbi->fs_lock); |
476 | ino = autofs4_dentry_ino(dentry); | |
477 | ino->flags &= ~AUTOFS_INF_EXPIRING; | |
213614d5 | 478 | autofs4_del_expiring(dentry); |
6e60a9ab | 479 | complete_all(&ino->expire_complete); |
97e7449a IK |
480 | spin_unlock(&sbi->fs_lock); |
481 | ||
482 | return ret; | |
1da177e4 LT |
483 | } |
484 | ||
56fcef75 IK |
485 | int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt, |
486 | struct autofs_sb_info *sbi, int when) | |
1da177e4 LT |
487 | { |
488 | struct dentry *dentry; | |
489 | int ret = -EAGAIN; | |
1da177e4 | 490 | |
a92daf6b | 491 | if (autofs_type_trigger(sbi->type)) |
56fcef75 | 492 | dentry = autofs4_expire_direct(sb, mnt, sbi, when); |
3a15e2ab | 493 | else |
56fcef75 | 494 | dentry = autofs4_expire_indirect(sb, mnt, sbi, when); |
3a15e2ab IK |
495 | |
496 | if (dentry) { | |
1f5f2c30 | 497 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
1da177e4 LT |
498 | |
499 | /* This is synchronous because it makes the daemon a | |
500 | little easier */ | |
1da177e4 | 501 | ret = autofs4_wait(sbi, dentry, NFY_EXPIRE); |
6e60a9ab | 502 | |
97e7449a | 503 | spin_lock(&sbi->fs_lock); |
6e60a9ab IK |
504 | if (ino->flags & AUTOFS_INF_MOUNTPOINT) { |
505 | sb->s_root->d_mounted++; | |
506 | ino->flags &= ~AUTOFS_INF_MOUNTPOINT; | |
507 | } | |
1f5f2c30 | 508 | ino->flags &= ~AUTOFS_INF_EXPIRING; |
213614d5 | 509 | autofs4_del_expiring(dentry); |
6e60a9ab | 510 | complete_all(&ino->expire_complete); |
97e7449a | 511 | spin_unlock(&sbi->fs_lock); |
1da177e4 LT |
512 | dput(dentry); |
513 | } | |
1f5f2c30 | 514 | |
1da177e4 LT |
515 | return ret; |
516 | } | |
517 | ||
56fcef75 IK |
518 | /* Call repeatedly until it returns -EAGAIN, meaning there's nothing |
519 | more to be done */ | |
520 | int autofs4_expire_multi(struct super_block *sb, struct vfsmount *mnt, | |
521 | struct autofs_sb_info *sbi, int __user *arg) | |
522 | { | |
523 | int do_now = 0; | |
524 | ||
525 | if (arg && get_user(do_now, arg)) | |
526 | return -EFAULT; | |
527 | ||
528 | return autofs4_do_expire_multi(sb, mnt, sbi, do_now); | |
529 | } | |
530 |