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 | { | |
e7854723 | 95 | struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb); |
d4a85e35 IK |
96 | struct list_head *next; |
97 | struct dentry *p, *q; | |
98 | ||
e7854723 | 99 | spin_lock(&sbi->lookup_lock); |
d4a85e35 IK |
100 | |
101 | if (prev == NULL) { | |
102 | spin_lock(&root->d_lock); | |
103 | prev = dget_dlock(root); | |
104 | next = prev->d_subdirs.next; | |
105 | p = prev; | |
106 | goto start; | |
107 | } | |
108 | ||
109 | p = prev; | |
110 | spin_lock(&p->d_lock); | |
111 | again: | |
112 | next = p->d_u.d_child.next; | |
113 | start: | |
114 | if (next == &root->d_subdirs) { | |
115 | spin_unlock(&p->d_lock); | |
e7854723 | 116 | spin_unlock(&sbi->lookup_lock); |
d4a85e35 IK |
117 | dput(prev); |
118 | return NULL; | |
119 | } | |
120 | ||
121 | q = list_entry(next, struct dentry, d_u.d_child); | |
122 | ||
123 | spin_lock_nested(&q->d_lock, DENTRY_D_LOCK_NESTED); | |
124 | /* Negative dentry - try next */ | |
125 | if (!simple_positive(q)) { | |
126 | spin_unlock(&p->d_lock); | |
127 | p = q; | |
128 | goto again; | |
129 | } | |
130 | dget_dlock(q); | |
131 | spin_unlock(&q->d_lock); | |
132 | spin_unlock(&p->d_lock); | |
e7854723 | 133 | spin_unlock(&sbi->lookup_lock); |
d4a85e35 IK |
134 | |
135 | dput(prev); | |
136 | ||
137 | return q; | |
138 | } | |
139 | ||
1ce12bad | 140 | /* |
2fd6b7f5 | 141 | * Calculate and dget next entry in top down tree traversal. |
1ce12bad | 142 | */ |
2fd6b7f5 NP |
143 | static struct dentry *get_next_positive_dentry(struct dentry *prev, |
144 | struct dentry *root) | |
1ce12bad | 145 | { |
e7854723 | 146 | struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb); |
2fd6b7f5 NP |
147 | struct list_head *next; |
148 | struct dentry *p, *ret; | |
149 | ||
150 | if (prev == NULL) | |
c14cc63a | 151 | return dget(root); |
1ce12bad | 152 | |
e7854723 | 153 | spin_lock(&sbi->lookup_lock); |
2fd6b7f5 NP |
154 | relock: |
155 | p = prev; | |
156 | spin_lock(&p->d_lock); | |
157 | again: | |
158 | next = p->d_subdirs.next; | |
1ce12bad IK |
159 | if (next == &p->d_subdirs) { |
160 | while (1) { | |
2fd6b7f5 NP |
161 | struct dentry *parent; |
162 | ||
163 | if (p == root) { | |
164 | spin_unlock(&p->d_lock); | |
e7854723 | 165 | spin_unlock(&sbi->lookup_lock); |
2fd6b7f5 | 166 | dput(prev); |
1ce12bad | 167 | return NULL; |
2fd6b7f5 NP |
168 | } |
169 | ||
170 | parent = p->d_parent; | |
171 | if (!spin_trylock(&parent->d_lock)) { | |
172 | spin_unlock(&p->d_lock); | |
173 | cpu_relax(); | |
174 | goto relock; | |
175 | } | |
176 | spin_unlock(&p->d_lock); | |
1ce12bad | 177 | next = p->d_u.d_child.next; |
2fd6b7f5 NP |
178 | p = parent; |
179 | if (next != &parent->d_subdirs) | |
1ce12bad | 180 | break; |
1ce12bad IK |
181 | } |
182 | } | |
2fd6b7f5 NP |
183 | ret = list_entry(next, struct dentry, d_u.d_child); |
184 | ||
185 | spin_lock_nested(&ret->d_lock, DENTRY_D_LOCK_NESTED); | |
186 | /* Negative dentry - try next */ | |
187 | if (!simple_positive(ret)) { | |
c14cc63a | 188 | spin_unlock(&p->d_lock); |
2fd6b7f5 NP |
189 | p = ret; |
190 | goto again; | |
191 | } | |
192 | dget_dlock(ret); | |
193 | spin_unlock(&ret->d_lock); | |
194 | spin_unlock(&p->d_lock); | |
e7854723 | 195 | spin_unlock(&sbi->lookup_lock); |
2fd6b7f5 NP |
196 | |
197 | dput(prev); | |
198 | ||
199 | return ret; | |
1ce12bad IK |
200 | } |
201 | ||
3a15e2ab IK |
202 | /* |
203 | * Check a direct mount point for busyness. | |
204 | * Direct mounts have similar expiry semantics to tree mounts. | |
205 | * The tree is not busy iff no mountpoints are busy and there are no | |
206 | * autofs submounts. | |
207 | */ | |
208 | static int autofs4_direct_busy(struct vfsmount *mnt, | |
209 | struct dentry *top, | |
210 | unsigned long timeout, | |
211 | int do_now) | |
212 | { | |
213 | DPRINTK("top %p %.*s", | |
214 | top, (int) top->d_name.len, top->d_name.name); | |
215 | ||
3a15e2ab IK |
216 | /* If it's busy update the expiry counters */ |
217 | if (!may_umount_tree(mnt)) { | |
218 | struct autofs_info *ino = autofs4_dentry_ino(top); | |
219 | if (ino) | |
220 | ino->last_used = jiffies; | |
221 | return 1; | |
222 | } | |
223 | ||
224 | /* Timeout of a direct mount is determined by its top dentry */ | |
225 | if (!autofs4_can_expire(top, timeout, do_now)) | |
226 | return 1; | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
1da177e4 LT |
231 | /* Check a directory tree of mount points for busyness |
232 | * The tree is not busy iff no mountpoints are busy | |
1da177e4 | 233 | */ |
1f5f2c30 IK |
234 | static int autofs4_tree_busy(struct vfsmount *mnt, |
235 | struct dentry *top, | |
236 | unsigned long timeout, | |
237 | int do_now) | |
1da177e4 | 238 | { |
e0a7aae9 | 239 | struct autofs_info *top_ino = autofs4_dentry_ino(top); |
1ce12bad | 240 | struct dentry *p; |
1da177e4 | 241 | |
1f5f2c30 | 242 | DPRINTK("top %p %.*s", |
1da177e4 LT |
243 | top, (int)top->d_name.len, top->d_name.name); |
244 | ||
245 | /* Negative dentry - give up */ | |
246 | if (!simple_positive(top)) | |
1f5f2c30 | 247 | return 1; |
1da177e4 | 248 | |
2fd6b7f5 NP |
249 | p = NULL; |
250 | while ((p = get_next_positive_dentry(p, top))) { | |
1da177e4 | 251 | DPRINTK("dentry %p %.*s", |
1ce12bad | 252 | p, (int) p->d_name.len, p->d_name.name); |
1da177e4 | 253 | |
1aff3c8b IK |
254 | /* |
255 | * Is someone visiting anywhere in the subtree ? | |
256 | * If there's no mount we need to check the usage | |
257 | * count for the autofs dentry. | |
e0a7aae9 | 258 | * If the fs is busy update the expiry counter. |
1aff3c8b | 259 | */ |
1ce12bad | 260 | if (d_mountpoint(p)) { |
1ce12bad | 261 | if (autofs4_mount_busy(mnt, p)) { |
e0a7aae9 | 262 | top_ino->last_used = jiffies; |
1ce12bad | 263 | dput(p); |
1f5f2c30 | 264 | return 1; |
1da177e4 | 265 | } |
1aff3c8b | 266 | } else { |
e0a7aae9 | 267 | struct autofs_info *ino = autofs4_dentry_ino(p); |
1aff3c8b IK |
268 | unsigned int ino_count = atomic_read(&ino->count); |
269 | ||
f9022f66 IK |
270 | /* |
271 | * Clean stale dentries below that have not been | |
272 | * invalidated after a mount fail during lookup | |
273 | */ | |
274 | d_invalidate(p); | |
275 | ||
1aff3c8b IK |
276 | /* allow for dget above and top is already dgot */ |
277 | if (p == top) | |
278 | ino_count += 2; | |
279 | else | |
280 | ino_count++; | |
281 | ||
b7ab39f6 | 282 | if (p->d_count > ino_count) { |
e0a7aae9 | 283 | top_ino->last_used = jiffies; |
1aff3c8b IK |
284 | dput(p); |
285 | return 1; | |
286 | } | |
1da177e4 | 287 | } |
1da177e4 | 288 | } |
1aff3c8b IK |
289 | |
290 | /* Timeout of a tree mount is ultimately determined by its top dentry */ | |
291 | if (!autofs4_can_expire(top, timeout, do_now)) | |
292 | return 1; | |
293 | ||
1f5f2c30 | 294 | return 0; |
1da177e4 LT |
295 | } |
296 | ||
297 | static struct dentry *autofs4_check_leaves(struct vfsmount *mnt, | |
298 | struct dentry *parent, | |
299 | unsigned long timeout, | |
300 | int do_now) | |
301 | { | |
1ce12bad | 302 | struct dentry *p; |
1da177e4 LT |
303 | |
304 | DPRINTK("parent %p %.*s", | |
305 | parent, (int)parent->d_name.len, parent->d_name.name); | |
306 | ||
2fd6b7f5 NP |
307 | p = NULL; |
308 | while ((p = get_next_positive_dentry(p, parent))) { | |
1da177e4 | 309 | DPRINTK("dentry %p %.*s", |
1ce12bad | 310 | p, (int) p->d_name.len, p->d_name.name); |
1da177e4 | 311 | |
1ce12bad | 312 | if (d_mountpoint(p)) { |
e0a7aae9 IK |
313 | /* Can we umount this guy */ |
314 | if (autofs4_mount_busy(mnt, p)) | |
2fd6b7f5 | 315 | continue; |
1da177e4 | 316 | |
e0a7aae9 IK |
317 | /* Can we expire this guy */ |
318 | if (autofs4_can_expire(p, timeout, do_now)) | |
1ce12bad | 319 | return p; |
1da177e4 | 320 | } |
1da177e4 | 321 | } |
1da177e4 LT |
322 | return NULL; |
323 | } | |
324 | ||
3a15e2ab | 325 | /* Check if we can expire a direct mount (possibly a tree) */ |
8d7b48e0 IK |
326 | struct dentry *autofs4_expire_direct(struct super_block *sb, |
327 | struct vfsmount *mnt, | |
328 | struct autofs_sb_info *sbi, | |
329 | int how) | |
3a15e2ab IK |
330 | { |
331 | unsigned long timeout; | |
332 | struct dentry *root = dget(sb->s_root); | |
333 | int do_now = how & AUTOFS_EXP_IMMEDIATE; | |
b5b80177 | 334 | struct autofs_info *ino; |
3a15e2ab | 335 | |
c0ba7e51 | 336 | if (!root) |
3a15e2ab IK |
337 | return NULL; |
338 | ||
339 | now = jiffies; | |
340 | timeout = sbi->exp_timeout; | |
341 | ||
3a15e2ab | 342 | spin_lock(&sbi->fs_lock); |
b5b80177 IK |
343 | ino = autofs4_dentry_ino(root); |
344 | /* No point expiring a pending mount */ | |
f9398c23 IK |
345 | if (ino->flags & AUTOFS_INF_PENDING) |
346 | goto out; | |
3a15e2ab IK |
347 | if (!autofs4_direct_busy(mnt, root, timeout, do_now)) { |
348 | struct autofs_info *ino = autofs4_dentry_ino(root); | |
3a15e2ab | 349 | ino->flags |= AUTOFS_INF_EXPIRING; |
6e60a9ab | 350 | init_completion(&ino->expire_complete); |
3a15e2ab IK |
351 | spin_unlock(&sbi->fs_lock); |
352 | return root; | |
353 | } | |
f9398c23 | 354 | out: |
3a15e2ab IK |
355 | spin_unlock(&sbi->fs_lock); |
356 | dput(root); | |
357 | ||
358 | return NULL; | |
359 | } | |
360 | ||
1da177e4 LT |
361 | /* |
362 | * Find an eligible tree to time-out | |
363 | * A tree is eligible if :- | |
364 | * - it is unused by any user process | |
365 | * - it has been unused for exp_timeout time | |
366 | */ | |
8d7b48e0 IK |
367 | struct dentry *autofs4_expire_indirect(struct super_block *sb, |
368 | struct vfsmount *mnt, | |
369 | struct autofs_sb_info *sbi, | |
370 | int how) | |
1da177e4 LT |
371 | { |
372 | unsigned long timeout; | |
373 | struct dentry *root = sb->s_root; | |
2fd6b7f5 | 374 | struct dentry *dentry; |
1da177e4 | 375 | struct dentry *expired = NULL; |
1da177e4 LT |
376 | int do_now = how & AUTOFS_EXP_IMMEDIATE; |
377 | int exp_leaves = how & AUTOFS_EXP_LEAVES; | |
97e7449a IK |
378 | struct autofs_info *ino; |
379 | unsigned int ino_count; | |
1da177e4 | 380 | |
c0ba7e51 | 381 | if (!root) |
1da177e4 LT |
382 | return NULL; |
383 | ||
384 | now = jiffies; | |
385 | timeout = sbi->exp_timeout; | |
386 | ||
2fd6b7f5 | 387 | dentry = NULL; |
d4a85e35 | 388 | while ((dentry = get_next_positive_subdir(dentry, root))) { |
97e7449a IK |
389 | spin_lock(&sbi->fs_lock); |
390 | ino = autofs4_dentry_ino(dentry); | |
b5b80177 IK |
391 | /* No point expiring a pending mount */ |
392 | if (ino->flags & AUTOFS_INF_PENDING) | |
3c319985 | 393 | goto next; |
97e7449a | 394 | |
3a15e2ab IK |
395 | /* |
396 | * Case 1: (i) indirect mount or top level pseudo direct mount | |
397 | * (autofs-4.1). | |
398 | * (ii) indirect mount with offset mount, check the "/" | |
399 | * offset (autofs-5.0+). | |
400 | */ | |
1da177e4 LT |
401 | if (d_mountpoint(dentry)) { |
402 | DPRINTK("checking mountpoint %p %.*s", | |
403 | dentry, (int)dentry->d_name.len, dentry->d_name.name); | |
404 | ||
97e7449a IK |
405 | /* Path walk currently on this dentry? */ |
406 | ino_count = atomic_read(&ino->count) + 2; | |
b7ab39f6 | 407 | if (dentry->d_count > ino_count) |
97e7449a IK |
408 | goto next; |
409 | ||
e0a7aae9 IK |
410 | /* Can we umount this guy */ |
411 | if (autofs4_mount_busy(mnt, dentry)) | |
1da177e4 LT |
412 | goto next; |
413 | ||
e0a7aae9 IK |
414 | /* Can we expire this guy */ |
415 | if (autofs4_can_expire(dentry, timeout, do_now)) { | |
1da177e4 | 416 | expired = dentry; |
afec570c | 417 | goto found; |
1da177e4 LT |
418 | } |
419 | goto next; | |
420 | } | |
421 | ||
1f5f2c30 | 422 | if (simple_empty(dentry)) |
1da177e4 LT |
423 | goto next; |
424 | ||
425 | /* Case 2: tree mount, expire iff entire tree is not busy */ | |
426 | if (!exp_leaves) { | |
97e7449a IK |
427 | /* Path walk currently on this dentry? */ |
428 | ino_count = atomic_read(&ino->count) + 1; | |
b7ab39f6 | 429 | if (dentry->d_count > ino_count) |
97e7449a | 430 | goto next; |
3a9720ce | 431 | |
97e7449a | 432 | if (!autofs4_tree_busy(mnt, dentry, timeout, do_now)) { |
3a9720ce | 433 | expired = dentry; |
afec570c | 434 | goto found; |
1da177e4 | 435 | } |
3a15e2ab IK |
436 | /* |
437 | * Case 3: pseudo direct mount, expire individual leaves | |
438 | * (autofs-4.1). | |
439 | */ | |
1da177e4 | 440 | } else { |
97e7449a IK |
441 | /* Path walk currently on this dentry? */ |
442 | ino_count = atomic_read(&ino->count) + 1; | |
b7ab39f6 | 443 | if (dentry->d_count > ino_count) |
97e7449a IK |
444 | goto next; |
445 | ||
1da177e4 LT |
446 | expired = autofs4_check_leaves(mnt, dentry, timeout, do_now); |
447 | if (expired) { | |
448 | dput(dentry); | |
afec570c | 449 | goto found; |
1da177e4 LT |
450 | } |
451 | } | |
452 | next: | |
97e7449a | 453 | spin_unlock(&sbi->fs_lock); |
1da177e4 | 454 | } |
1da177e4 | 455 | return NULL; |
afec570c IK |
456 | |
457 | found: | |
458 | DPRINTK("returning %p %.*s", | |
459 | expired, (int)expired->d_name.len, expired->d_name.name); | |
97e7449a IK |
460 | ino = autofs4_dentry_ino(expired); |
461 | ino->flags |= AUTOFS_INF_EXPIRING; | |
6e60a9ab | 462 | init_completion(&ino->expire_complete); |
97e7449a | 463 | spin_unlock(&sbi->fs_lock); |
e7854723 | 464 | spin_lock(&sbi->lookup_lock); |
2fd6b7f5 NP |
465 | spin_lock(&expired->d_parent->d_lock); |
466 | spin_lock_nested(&expired->d_lock, DENTRY_D_LOCK_NESTED); | |
afec570c | 467 | list_move(&expired->d_parent->d_subdirs, &expired->d_u.d_child); |
2fd6b7f5 NP |
468 | spin_unlock(&expired->d_lock); |
469 | spin_unlock(&expired->d_parent->d_lock); | |
e7854723 | 470 | spin_unlock(&sbi->lookup_lock); |
afec570c | 471 | return expired; |
1da177e4 LT |
472 | } |
473 | ||
06a35985 IK |
474 | int autofs4_expire_wait(struct dentry *dentry) |
475 | { | |
476 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
477 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
478 | int status; | |
479 | ||
480 | /* Block on any pending expire */ | |
481 | spin_lock(&sbi->fs_lock); | |
482 | if (ino->flags & AUTOFS_INF_EXPIRING) { | |
483 | spin_unlock(&sbi->fs_lock); | |
484 | ||
485 | DPRINTK("waiting for expire %p name=%.*s", | |
486 | dentry, dentry->d_name.len, dentry->d_name.name); | |
487 | ||
488 | status = autofs4_wait(sbi, dentry, NFY_NONE); | |
489 | wait_for_completion(&ino->expire_complete); | |
490 | ||
491 | DPRINTK("expire done status=%d", status); | |
492 | ||
4b1ae27a | 493 | if (d_unhashed(dentry)) |
06a35985 IK |
494 | return -EAGAIN; |
495 | ||
496 | return status; | |
497 | } | |
498 | spin_unlock(&sbi->fs_lock); | |
499 | ||
500 | return 0; | |
501 | } | |
502 | ||
1da177e4 LT |
503 | /* Perform an expiry operation */ |
504 | int autofs4_expire_run(struct super_block *sb, | |
505 | struct vfsmount *mnt, | |
506 | struct autofs_sb_info *sbi, | |
507 | struct autofs_packet_expire __user *pkt_p) | |
508 | { | |
509 | struct autofs_packet_expire pkt; | |
97e7449a | 510 | struct autofs_info *ino; |
1da177e4 | 511 | struct dentry *dentry; |
97e7449a | 512 | int ret = 0; |
1da177e4 LT |
513 | |
514 | memset(&pkt,0,sizeof pkt); | |
515 | ||
516 | pkt.hdr.proto_version = sbi->version; | |
517 | pkt.hdr.type = autofs_ptype_expire; | |
518 | ||
3a15e2ab | 519 | if ((dentry = autofs4_expire_indirect(sb, mnt, sbi, 0)) == NULL) |
1da177e4 LT |
520 | return -EAGAIN; |
521 | ||
522 | pkt.len = dentry->d_name.len; | |
523 | memcpy(pkt.name, dentry->d_name.name, pkt.len); | |
524 | pkt.name[pkt.len] = '\0'; | |
525 | dput(dentry); | |
526 | ||
527 | if ( copy_to_user(pkt_p, &pkt, sizeof(struct autofs_packet_expire)) ) | |
97e7449a | 528 | ret = -EFAULT; |
1da177e4 | 529 | |
97e7449a IK |
530 | spin_lock(&sbi->fs_lock); |
531 | ino = autofs4_dentry_ino(dentry); | |
532 | ino->flags &= ~AUTOFS_INF_EXPIRING; | |
6e60a9ab | 533 | complete_all(&ino->expire_complete); |
97e7449a IK |
534 | spin_unlock(&sbi->fs_lock); |
535 | ||
536 | return ret; | |
1da177e4 LT |
537 | } |
538 | ||
56fcef75 IK |
539 | int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt, |
540 | struct autofs_sb_info *sbi, int when) | |
1da177e4 LT |
541 | { |
542 | struct dentry *dentry; | |
543 | int ret = -EAGAIN; | |
1da177e4 | 544 | |
a92daf6b | 545 | if (autofs_type_trigger(sbi->type)) |
56fcef75 | 546 | dentry = autofs4_expire_direct(sb, mnt, sbi, when); |
3a15e2ab | 547 | else |
56fcef75 | 548 | dentry = autofs4_expire_indirect(sb, mnt, sbi, when); |
3a15e2ab IK |
549 | |
550 | if (dentry) { | |
1f5f2c30 | 551 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
1da177e4 LT |
552 | |
553 | /* This is synchronous because it makes the daemon a | |
554 | little easier */ | |
1da177e4 | 555 | ret = autofs4_wait(sbi, dentry, NFY_EXPIRE); |
6e60a9ab | 556 | |
97e7449a | 557 | spin_lock(&sbi->fs_lock); |
1f5f2c30 | 558 | ino->flags &= ~AUTOFS_INF_EXPIRING; |
b5b80177 | 559 | spin_lock(&dentry->d_lock); |
3c319985 | 560 | if (!ret) { |
b5b80177 IK |
561 | if ((IS_ROOT(dentry) || |
562 | (autofs_type_indirect(sbi->type) && | |
563 | IS_ROOT(dentry->d_parent))) && | |
564 | !(dentry->d_flags & DCACHE_NEED_AUTOMOUNT)) | |
565 | __managed_dentry_set_automount(dentry); | |
566 | } | |
567 | spin_unlock(&dentry->d_lock); | |
6e60a9ab | 568 | complete_all(&ino->expire_complete); |
97e7449a | 569 | spin_unlock(&sbi->fs_lock); |
1da177e4 LT |
570 | dput(dentry); |
571 | } | |
1f5f2c30 | 572 | |
1da177e4 LT |
573 | return ret; |
574 | } | |
575 | ||
56fcef75 IK |
576 | /* Call repeatedly until it returns -EAGAIN, meaning there's nothing |
577 | more to be done */ | |
578 | int autofs4_expire_multi(struct super_block *sb, struct vfsmount *mnt, | |
579 | struct autofs_sb_info *sbi, int __user *arg) | |
580 | { | |
581 | int do_now = 0; | |
582 | ||
583 | if (arg && get_user(do_now, arg)) | |
584 | return -EFAULT; | |
585 | ||
586 | return autofs4_do_expire_multi(sb, mnt, sbi, do_now); | |
587 | } | |
588 |