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); | |
1d6f2097 | 127 | lock_set_subclass(&q->d_lock.dep_map, 0, _RET_IP_); |
d4a85e35 IK |
128 | p = q; |
129 | goto again; | |
130 | } | |
131 | dget_dlock(q); | |
132 | spin_unlock(&q->d_lock); | |
133 | spin_unlock(&p->d_lock); | |
e7854723 | 134 | spin_unlock(&sbi->lookup_lock); |
d4a85e35 IK |
135 | |
136 | dput(prev); | |
137 | ||
138 | return q; | |
139 | } | |
140 | ||
1ce12bad | 141 | /* |
2fd6b7f5 | 142 | * Calculate and dget next entry in top down tree traversal. |
1ce12bad | 143 | */ |
2fd6b7f5 NP |
144 | static struct dentry *get_next_positive_dentry(struct dentry *prev, |
145 | struct dentry *root) | |
1ce12bad | 146 | { |
e7854723 | 147 | struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb); |
2fd6b7f5 NP |
148 | struct list_head *next; |
149 | struct dentry *p, *ret; | |
150 | ||
151 | if (prev == NULL) | |
c14cc63a | 152 | return dget(root); |
1ce12bad | 153 | |
e7854723 | 154 | spin_lock(&sbi->lookup_lock); |
2fd6b7f5 NP |
155 | relock: |
156 | p = prev; | |
157 | spin_lock(&p->d_lock); | |
158 | again: | |
159 | next = p->d_subdirs.next; | |
1ce12bad IK |
160 | if (next == &p->d_subdirs) { |
161 | while (1) { | |
2fd6b7f5 NP |
162 | struct dentry *parent; |
163 | ||
164 | if (p == root) { | |
165 | spin_unlock(&p->d_lock); | |
e7854723 | 166 | spin_unlock(&sbi->lookup_lock); |
2fd6b7f5 | 167 | dput(prev); |
1ce12bad | 168 | return NULL; |
2fd6b7f5 NP |
169 | } |
170 | ||
171 | parent = p->d_parent; | |
172 | if (!spin_trylock(&parent->d_lock)) { | |
173 | spin_unlock(&p->d_lock); | |
174 | cpu_relax(); | |
175 | goto relock; | |
176 | } | |
177 | spin_unlock(&p->d_lock); | |
1ce12bad | 178 | next = p->d_u.d_child.next; |
2fd6b7f5 NP |
179 | p = parent; |
180 | if (next != &parent->d_subdirs) | |
1ce12bad | 181 | break; |
1ce12bad IK |
182 | } |
183 | } | |
2fd6b7f5 NP |
184 | ret = list_entry(next, struct dentry, d_u.d_child); |
185 | ||
186 | spin_lock_nested(&ret->d_lock, DENTRY_D_LOCK_NESTED); | |
187 | /* Negative dentry - try next */ | |
188 | if (!simple_positive(ret)) { | |
c14cc63a | 189 | spin_unlock(&p->d_lock); |
1d6f2097 | 190 | lock_set_subclass(&ret->d_lock.dep_map, 0, _RET_IP_); |
2fd6b7f5 NP |
191 | p = ret; |
192 | goto again; | |
193 | } | |
194 | dget_dlock(ret); | |
195 | spin_unlock(&ret->d_lock); | |
196 | spin_unlock(&p->d_lock); | |
e7854723 | 197 | spin_unlock(&sbi->lookup_lock); |
2fd6b7f5 NP |
198 | |
199 | dput(prev); | |
200 | ||
201 | return ret; | |
1ce12bad IK |
202 | } |
203 | ||
3a15e2ab IK |
204 | /* |
205 | * Check a direct mount point for busyness. | |
206 | * Direct mounts have similar expiry semantics to tree mounts. | |
207 | * The tree is not busy iff no mountpoints are busy and there are no | |
208 | * autofs submounts. | |
209 | */ | |
210 | static int autofs4_direct_busy(struct vfsmount *mnt, | |
211 | struct dentry *top, | |
212 | unsigned long timeout, | |
213 | int do_now) | |
214 | { | |
215 | DPRINTK("top %p %.*s", | |
216 | top, (int) top->d_name.len, top->d_name.name); | |
217 | ||
3a15e2ab IK |
218 | /* If it's busy update the expiry counters */ |
219 | if (!may_umount_tree(mnt)) { | |
220 | struct autofs_info *ino = autofs4_dentry_ino(top); | |
221 | if (ino) | |
222 | ino->last_used = jiffies; | |
223 | return 1; | |
224 | } | |
225 | ||
226 | /* Timeout of a direct mount is determined by its top dentry */ | |
227 | if (!autofs4_can_expire(top, timeout, do_now)) | |
228 | return 1; | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
1da177e4 LT |
233 | /* Check a directory tree of mount points for busyness |
234 | * The tree is not busy iff no mountpoints are busy | |
1da177e4 | 235 | */ |
1f5f2c30 IK |
236 | static int autofs4_tree_busy(struct vfsmount *mnt, |
237 | struct dentry *top, | |
238 | unsigned long timeout, | |
239 | int do_now) | |
1da177e4 | 240 | { |
e0a7aae9 | 241 | struct autofs_info *top_ino = autofs4_dentry_ino(top); |
1ce12bad | 242 | struct dentry *p; |
1da177e4 | 243 | |
1f5f2c30 | 244 | DPRINTK("top %p %.*s", |
1da177e4 LT |
245 | top, (int)top->d_name.len, top->d_name.name); |
246 | ||
247 | /* Negative dentry - give up */ | |
248 | if (!simple_positive(top)) | |
1f5f2c30 | 249 | return 1; |
1da177e4 | 250 | |
2fd6b7f5 NP |
251 | p = NULL; |
252 | while ((p = get_next_positive_dentry(p, top))) { | |
1da177e4 | 253 | DPRINTK("dentry %p %.*s", |
1ce12bad | 254 | p, (int) p->d_name.len, p->d_name.name); |
1da177e4 | 255 | |
1aff3c8b IK |
256 | /* |
257 | * Is someone visiting anywhere in the subtree ? | |
258 | * If there's no mount we need to check the usage | |
259 | * count for the autofs dentry. | |
e0a7aae9 | 260 | * If the fs is busy update the expiry counter. |
1aff3c8b | 261 | */ |
1ce12bad | 262 | if (d_mountpoint(p)) { |
1ce12bad | 263 | if (autofs4_mount_busy(mnt, p)) { |
e0a7aae9 | 264 | top_ino->last_used = jiffies; |
1ce12bad | 265 | dput(p); |
1f5f2c30 | 266 | return 1; |
1da177e4 | 267 | } |
1aff3c8b | 268 | } else { |
e0a7aae9 | 269 | struct autofs_info *ino = autofs4_dentry_ino(p); |
1aff3c8b IK |
270 | unsigned int ino_count = atomic_read(&ino->count); |
271 | ||
f9022f66 IK |
272 | /* |
273 | * Clean stale dentries below that have not been | |
274 | * invalidated after a mount fail during lookup | |
275 | */ | |
276 | d_invalidate(p); | |
277 | ||
1aff3c8b IK |
278 | /* allow for dget above and top is already dgot */ |
279 | if (p == top) | |
280 | ino_count += 2; | |
281 | else | |
282 | ino_count++; | |
283 | ||
b7ab39f6 | 284 | if (p->d_count > ino_count) { |
e0a7aae9 | 285 | top_ino->last_used = jiffies; |
1aff3c8b IK |
286 | dput(p); |
287 | return 1; | |
288 | } | |
1da177e4 | 289 | } |
1da177e4 | 290 | } |
1aff3c8b IK |
291 | |
292 | /* Timeout of a tree mount is ultimately determined by its top dentry */ | |
293 | if (!autofs4_can_expire(top, timeout, do_now)) | |
294 | return 1; | |
295 | ||
1f5f2c30 | 296 | return 0; |
1da177e4 LT |
297 | } |
298 | ||
299 | static struct dentry *autofs4_check_leaves(struct vfsmount *mnt, | |
300 | struct dentry *parent, | |
301 | unsigned long timeout, | |
302 | int do_now) | |
303 | { | |
1ce12bad | 304 | struct dentry *p; |
1da177e4 LT |
305 | |
306 | DPRINTK("parent %p %.*s", | |
307 | parent, (int)parent->d_name.len, parent->d_name.name); | |
308 | ||
2fd6b7f5 NP |
309 | p = NULL; |
310 | while ((p = get_next_positive_dentry(p, parent))) { | |
1da177e4 | 311 | DPRINTK("dentry %p %.*s", |
1ce12bad | 312 | p, (int) p->d_name.len, p->d_name.name); |
1da177e4 | 313 | |
1ce12bad | 314 | if (d_mountpoint(p)) { |
e0a7aae9 IK |
315 | /* Can we umount this guy */ |
316 | if (autofs4_mount_busy(mnt, p)) | |
2fd6b7f5 | 317 | continue; |
1da177e4 | 318 | |
e0a7aae9 IK |
319 | /* Can we expire this guy */ |
320 | if (autofs4_can_expire(p, timeout, do_now)) | |
1ce12bad | 321 | return p; |
1da177e4 | 322 | } |
1da177e4 | 323 | } |
1da177e4 LT |
324 | return NULL; |
325 | } | |
326 | ||
3a15e2ab | 327 | /* Check if we can expire a direct mount (possibly a tree) */ |
8d7b48e0 IK |
328 | struct dentry *autofs4_expire_direct(struct super_block *sb, |
329 | struct vfsmount *mnt, | |
330 | struct autofs_sb_info *sbi, | |
331 | int how) | |
3a15e2ab IK |
332 | { |
333 | unsigned long timeout; | |
334 | struct dentry *root = dget(sb->s_root); | |
335 | int do_now = how & AUTOFS_EXP_IMMEDIATE; | |
b5b80177 | 336 | struct autofs_info *ino; |
3a15e2ab | 337 | |
c0ba7e51 | 338 | if (!root) |
3a15e2ab IK |
339 | return NULL; |
340 | ||
341 | now = jiffies; | |
342 | timeout = sbi->exp_timeout; | |
343 | ||
3a15e2ab | 344 | spin_lock(&sbi->fs_lock); |
b5b80177 IK |
345 | ino = autofs4_dentry_ino(root); |
346 | /* No point expiring a pending mount */ | |
f9398c23 IK |
347 | if (ino->flags & AUTOFS_INF_PENDING) |
348 | goto out; | |
3a15e2ab IK |
349 | if (!autofs4_direct_busy(mnt, root, timeout, do_now)) { |
350 | struct autofs_info *ino = autofs4_dentry_ino(root); | |
3a15e2ab | 351 | ino->flags |= AUTOFS_INF_EXPIRING; |
6e60a9ab | 352 | init_completion(&ino->expire_complete); |
3a15e2ab IK |
353 | spin_unlock(&sbi->fs_lock); |
354 | return root; | |
355 | } | |
f9398c23 | 356 | out: |
3a15e2ab IK |
357 | spin_unlock(&sbi->fs_lock); |
358 | dput(root); | |
359 | ||
360 | return NULL; | |
361 | } | |
362 | ||
1da177e4 LT |
363 | /* |
364 | * Find an eligible tree to time-out | |
365 | * A tree is eligible if :- | |
366 | * - it is unused by any user process | |
367 | * - it has been unused for exp_timeout time | |
368 | */ | |
8d7b48e0 IK |
369 | struct dentry *autofs4_expire_indirect(struct super_block *sb, |
370 | struct vfsmount *mnt, | |
371 | struct autofs_sb_info *sbi, | |
372 | int how) | |
1da177e4 LT |
373 | { |
374 | unsigned long timeout; | |
375 | struct dentry *root = sb->s_root; | |
2fd6b7f5 | 376 | struct dentry *dentry; |
1da177e4 | 377 | struct dentry *expired = NULL; |
1da177e4 LT |
378 | int do_now = how & AUTOFS_EXP_IMMEDIATE; |
379 | int exp_leaves = how & AUTOFS_EXP_LEAVES; | |
97e7449a IK |
380 | struct autofs_info *ino; |
381 | unsigned int ino_count; | |
1da177e4 | 382 | |
c0ba7e51 | 383 | if (!root) |
1da177e4 LT |
384 | return NULL; |
385 | ||
386 | now = jiffies; | |
387 | timeout = sbi->exp_timeout; | |
388 | ||
2fd6b7f5 | 389 | dentry = NULL; |
d4a85e35 | 390 | while ((dentry = get_next_positive_subdir(dentry, root))) { |
97e7449a IK |
391 | spin_lock(&sbi->fs_lock); |
392 | ino = autofs4_dentry_ino(dentry); | |
b5b80177 IK |
393 | /* No point expiring a pending mount */ |
394 | if (ino->flags & AUTOFS_INF_PENDING) | |
3c319985 | 395 | goto next; |
97e7449a | 396 | |
3a15e2ab IK |
397 | /* |
398 | * Case 1: (i) indirect mount or top level pseudo direct mount | |
399 | * (autofs-4.1). | |
400 | * (ii) indirect mount with offset mount, check the "/" | |
401 | * offset (autofs-5.0+). | |
402 | */ | |
1da177e4 LT |
403 | if (d_mountpoint(dentry)) { |
404 | DPRINTK("checking mountpoint %p %.*s", | |
405 | dentry, (int)dentry->d_name.len, dentry->d_name.name); | |
406 | ||
97e7449a IK |
407 | /* Path walk currently on this dentry? */ |
408 | ino_count = atomic_read(&ino->count) + 2; | |
b7ab39f6 | 409 | if (dentry->d_count > ino_count) |
97e7449a IK |
410 | goto next; |
411 | ||
e0a7aae9 IK |
412 | /* Can we umount this guy */ |
413 | if (autofs4_mount_busy(mnt, dentry)) | |
1da177e4 LT |
414 | goto next; |
415 | ||
e0a7aae9 IK |
416 | /* Can we expire this guy */ |
417 | if (autofs4_can_expire(dentry, timeout, do_now)) { | |
1da177e4 | 418 | expired = dentry; |
afec570c | 419 | goto found; |
1da177e4 LT |
420 | } |
421 | goto next; | |
422 | } | |
423 | ||
1f5f2c30 | 424 | if (simple_empty(dentry)) |
1da177e4 LT |
425 | goto next; |
426 | ||
427 | /* Case 2: tree mount, expire iff entire tree is not busy */ | |
428 | if (!exp_leaves) { | |
97e7449a IK |
429 | /* Path walk currently on this dentry? */ |
430 | ino_count = atomic_read(&ino->count) + 1; | |
b7ab39f6 | 431 | if (dentry->d_count > ino_count) |
97e7449a | 432 | goto next; |
3a9720ce | 433 | |
97e7449a | 434 | if (!autofs4_tree_busy(mnt, dentry, timeout, do_now)) { |
3a9720ce | 435 | expired = dentry; |
afec570c | 436 | goto found; |
1da177e4 | 437 | } |
3a15e2ab IK |
438 | /* |
439 | * Case 3: pseudo direct mount, expire individual leaves | |
440 | * (autofs-4.1). | |
441 | */ | |
1da177e4 | 442 | } else { |
97e7449a IK |
443 | /* Path walk currently on this dentry? */ |
444 | ino_count = atomic_read(&ino->count) + 1; | |
b7ab39f6 | 445 | if (dentry->d_count > ino_count) |
97e7449a IK |
446 | goto next; |
447 | ||
1da177e4 LT |
448 | expired = autofs4_check_leaves(mnt, dentry, timeout, do_now); |
449 | if (expired) { | |
450 | dput(dentry); | |
afec570c | 451 | goto found; |
1da177e4 LT |
452 | } |
453 | } | |
454 | next: | |
97e7449a | 455 | spin_unlock(&sbi->fs_lock); |
1da177e4 | 456 | } |
1da177e4 | 457 | return NULL; |
afec570c IK |
458 | |
459 | found: | |
460 | DPRINTK("returning %p %.*s", | |
461 | expired, (int)expired->d_name.len, expired->d_name.name); | |
97e7449a IK |
462 | ino = autofs4_dentry_ino(expired); |
463 | ino->flags |= AUTOFS_INF_EXPIRING; | |
6e60a9ab | 464 | init_completion(&ino->expire_complete); |
97e7449a | 465 | spin_unlock(&sbi->fs_lock); |
e7854723 | 466 | spin_lock(&sbi->lookup_lock); |
2fd6b7f5 NP |
467 | spin_lock(&expired->d_parent->d_lock); |
468 | spin_lock_nested(&expired->d_lock, DENTRY_D_LOCK_NESTED); | |
afec570c | 469 | list_move(&expired->d_parent->d_subdirs, &expired->d_u.d_child); |
2fd6b7f5 NP |
470 | spin_unlock(&expired->d_lock); |
471 | spin_unlock(&expired->d_parent->d_lock); | |
e7854723 | 472 | spin_unlock(&sbi->lookup_lock); |
afec570c | 473 | return expired; |
1da177e4 LT |
474 | } |
475 | ||
06a35985 IK |
476 | int autofs4_expire_wait(struct dentry *dentry) |
477 | { | |
478 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
479 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
480 | int status; | |
481 | ||
482 | /* Block on any pending expire */ | |
483 | spin_lock(&sbi->fs_lock); | |
484 | if (ino->flags & AUTOFS_INF_EXPIRING) { | |
485 | spin_unlock(&sbi->fs_lock); | |
486 | ||
487 | DPRINTK("waiting for expire %p name=%.*s", | |
488 | dentry, dentry->d_name.len, dentry->d_name.name); | |
489 | ||
490 | status = autofs4_wait(sbi, dentry, NFY_NONE); | |
491 | wait_for_completion(&ino->expire_complete); | |
492 | ||
493 | DPRINTK("expire done status=%d", status); | |
494 | ||
4b1ae27a | 495 | if (d_unhashed(dentry)) |
06a35985 IK |
496 | return -EAGAIN; |
497 | ||
498 | return status; | |
499 | } | |
500 | spin_unlock(&sbi->fs_lock); | |
501 | ||
502 | return 0; | |
503 | } | |
504 | ||
1da177e4 LT |
505 | /* Perform an expiry operation */ |
506 | int autofs4_expire_run(struct super_block *sb, | |
507 | struct vfsmount *mnt, | |
508 | struct autofs_sb_info *sbi, | |
509 | struct autofs_packet_expire __user *pkt_p) | |
510 | { | |
511 | struct autofs_packet_expire pkt; | |
97e7449a | 512 | struct autofs_info *ino; |
1da177e4 | 513 | struct dentry *dentry; |
97e7449a | 514 | int ret = 0; |
1da177e4 LT |
515 | |
516 | memset(&pkt,0,sizeof pkt); | |
517 | ||
518 | pkt.hdr.proto_version = sbi->version; | |
519 | pkt.hdr.type = autofs_ptype_expire; | |
520 | ||
3a15e2ab | 521 | if ((dentry = autofs4_expire_indirect(sb, mnt, sbi, 0)) == NULL) |
1da177e4 LT |
522 | return -EAGAIN; |
523 | ||
524 | pkt.len = dentry->d_name.len; | |
525 | memcpy(pkt.name, dentry->d_name.name, pkt.len); | |
526 | pkt.name[pkt.len] = '\0'; | |
527 | dput(dentry); | |
528 | ||
529 | if ( copy_to_user(pkt_p, &pkt, sizeof(struct autofs_packet_expire)) ) | |
97e7449a | 530 | ret = -EFAULT; |
1da177e4 | 531 | |
97e7449a IK |
532 | spin_lock(&sbi->fs_lock); |
533 | ino = autofs4_dentry_ino(dentry); | |
534 | ino->flags &= ~AUTOFS_INF_EXPIRING; | |
6e60a9ab | 535 | complete_all(&ino->expire_complete); |
97e7449a IK |
536 | spin_unlock(&sbi->fs_lock); |
537 | ||
538 | return ret; | |
1da177e4 LT |
539 | } |
540 | ||
56fcef75 IK |
541 | int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt, |
542 | struct autofs_sb_info *sbi, int when) | |
1da177e4 LT |
543 | { |
544 | struct dentry *dentry; | |
545 | int ret = -EAGAIN; | |
1da177e4 | 546 | |
a92daf6b | 547 | if (autofs_type_trigger(sbi->type)) |
56fcef75 | 548 | dentry = autofs4_expire_direct(sb, mnt, sbi, when); |
3a15e2ab | 549 | else |
56fcef75 | 550 | dentry = autofs4_expire_indirect(sb, mnt, sbi, when); |
3a15e2ab IK |
551 | |
552 | if (dentry) { | |
1f5f2c30 | 553 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
1da177e4 LT |
554 | |
555 | /* This is synchronous because it makes the daemon a | |
556 | little easier */ | |
1da177e4 | 557 | ret = autofs4_wait(sbi, dentry, NFY_EXPIRE); |
6e60a9ab | 558 | |
97e7449a | 559 | spin_lock(&sbi->fs_lock); |
1f5f2c30 | 560 | ino->flags &= ~AUTOFS_INF_EXPIRING; |
b5b80177 | 561 | spin_lock(&dentry->d_lock); |
3c319985 | 562 | if (!ret) { |
b5b80177 IK |
563 | if ((IS_ROOT(dentry) || |
564 | (autofs_type_indirect(sbi->type) && | |
565 | IS_ROOT(dentry->d_parent))) && | |
566 | !(dentry->d_flags & DCACHE_NEED_AUTOMOUNT)) | |
567 | __managed_dentry_set_automount(dentry); | |
568 | } | |
569 | spin_unlock(&dentry->d_lock); | |
6e60a9ab | 570 | complete_all(&ino->expire_complete); |
97e7449a | 571 | spin_unlock(&sbi->fs_lock); |
1da177e4 LT |
572 | dput(dentry); |
573 | } | |
1f5f2c30 | 574 | |
1da177e4 LT |
575 | return ret; |
576 | } | |
577 | ||
56fcef75 IK |
578 | /* Call repeatedly until it returns -EAGAIN, meaning there's nothing |
579 | more to be done */ | |
580 | int autofs4_expire_multi(struct super_block *sb, struct vfsmount *mnt, | |
581 | struct autofs_sb_info *sbi, int __user *arg) | |
582 | { | |
583 | int do_now = 0; | |
584 | ||
585 | if (arg && get_user(do_now, arg)) | |
586 | return -EFAULT; | |
587 | ||
588 | return autofs4_do_expire_multi(sb, mnt, sbi, do_now); | |
589 | } | |
590 |