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Commit | Line | Data |
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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 | 32 | return 0; |
1da177e4 | 33 | } |
1da177e4 LT |
34 | return 1; |
35 | } | |
36 | ||
1f5f2c30 IK |
37 | /* Check a mount point for busyness */ |
38 | static int autofs4_mount_busy(struct vfsmount *mnt, struct dentry *dentry) | |
1da177e4 | 39 | { |
e0a7aae9 | 40 | struct dentry *top = dentry; |
9393bd07 | 41 | struct path path = {.mnt = mnt, .dentry = dentry}; |
1f5f2c30 | 42 | int status = 1; |
1da177e4 | 43 | |
a455589f | 44 | DPRINTK("dentry %p %pd", dentry, dentry); |
1da177e4 | 45 | |
9393bd07 | 46 | path_get(&path); |
1da177e4 | 47 | |
cc53ce53 | 48 | if (!follow_down_one(&path)) |
1da177e4 LT |
49 | goto done; |
50 | ||
9393bd07 AV |
51 | if (is_autofs4_dentry(path.dentry)) { |
52 | struct autofs_sb_info *sbi = autofs4_sbi(path.dentry->d_sb); | |
bc9c4068 IK |
53 | |
54 | /* This is an autofs submount, we can't expire it */ | |
a92daf6b | 55 | if (autofs_type_indirect(sbi->type)) |
bc9c4068 | 56 | goto done; |
bc9c4068 | 57 | } |
1da177e4 | 58 | |
e0a7aae9 | 59 | /* Update the expiry counter if fs is busy */ |
37d0892c | 60 | if (!may_umount_tree(path.mnt)) { |
e0a7aae9 IK |
61 | struct autofs_info *ino = autofs4_dentry_ino(top); |
62 | ino->last_used = jiffies; | |
63 | goto done; | |
64 | } | |
65 | ||
66 | status = 0; | |
1da177e4 LT |
67 | done: |
68 | DPRINTK("returning = %d", status); | |
9393bd07 | 69 | path_put(&path); |
1da177e4 LT |
70 | return status; |
71 | } | |
72 | ||
d4a85e35 IK |
73 | /* |
74 | * Calculate and dget next entry in the subdirs list under root. | |
75 | */ | |
76 | static struct dentry *get_next_positive_subdir(struct dentry *prev, | |
77 | struct dentry *root) | |
78 | { | |
e7854723 | 79 | struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb); |
d4a85e35 | 80 | struct list_head *next; |
a45440f0 | 81 | struct dentry *q; |
d4a85e35 | 82 | |
e7854723 | 83 | spin_lock(&sbi->lookup_lock); |
a45440f0 | 84 | spin_lock(&root->d_lock); |
d4a85e35 | 85 | |
a45440f0 | 86 | if (prev) |
946e51f2 | 87 | next = prev->d_child.next; |
a45440f0 | 88 | else { |
d4a85e35 IK |
89 | prev = dget_dlock(root); |
90 | next = prev->d_subdirs.next; | |
d4a85e35 IK |
91 | } |
92 | ||
a45440f0 | 93 | cont: |
d4a85e35 | 94 | if (next == &root->d_subdirs) { |
a45440f0 | 95 | spin_unlock(&root->d_lock); |
e7854723 | 96 | spin_unlock(&sbi->lookup_lock); |
d4a85e35 IK |
97 | dput(prev); |
98 | return NULL; | |
99 | } | |
100 | ||
946e51f2 | 101 | q = list_entry(next, struct dentry, d_child); |
d4a85e35 IK |
102 | |
103 | spin_lock_nested(&q->d_lock, DENTRY_D_LOCK_NESTED); | |
a45440f0 | 104 | /* Already gone or negative dentry (under construction) - try next */ |
84d08fa8 | 105 | if (!d_count(q) || !simple_positive(q)) { |
a45440f0 | 106 | spin_unlock(&q->d_lock); |
946e51f2 | 107 | next = q->d_child.next; |
a45440f0 | 108 | goto cont; |
d4a85e35 IK |
109 | } |
110 | dget_dlock(q); | |
111 | spin_unlock(&q->d_lock); | |
a45440f0 | 112 | spin_unlock(&root->d_lock); |
e7854723 | 113 | spin_unlock(&sbi->lookup_lock); |
d4a85e35 IK |
114 | |
115 | dput(prev); | |
116 | ||
117 | return q; | |
118 | } | |
119 | ||
1ce12bad | 120 | /* |
2fd6b7f5 | 121 | * Calculate and dget next entry in top down tree traversal. |
1ce12bad | 122 | */ |
2fd6b7f5 NP |
123 | static struct dentry *get_next_positive_dentry(struct dentry *prev, |
124 | struct dentry *root) | |
1ce12bad | 125 | { |
e7854723 | 126 | struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb); |
2fd6b7f5 NP |
127 | struct list_head *next; |
128 | struct dentry *p, *ret; | |
129 | ||
130 | if (prev == NULL) | |
c14cc63a | 131 | return dget(root); |
1ce12bad | 132 | |
e7854723 | 133 | spin_lock(&sbi->lookup_lock); |
2fd6b7f5 NP |
134 | relock: |
135 | p = prev; | |
136 | spin_lock(&p->d_lock); | |
137 | again: | |
138 | next = p->d_subdirs.next; | |
1ce12bad IK |
139 | if (next == &p->d_subdirs) { |
140 | while (1) { | |
2fd6b7f5 NP |
141 | struct dentry *parent; |
142 | ||
143 | if (p == root) { | |
144 | spin_unlock(&p->d_lock); | |
e7854723 | 145 | spin_unlock(&sbi->lookup_lock); |
2fd6b7f5 | 146 | dput(prev); |
1ce12bad | 147 | return NULL; |
2fd6b7f5 NP |
148 | } |
149 | ||
150 | parent = p->d_parent; | |
151 | if (!spin_trylock(&parent->d_lock)) { | |
152 | spin_unlock(&p->d_lock); | |
153 | cpu_relax(); | |
154 | goto relock; | |
155 | } | |
156 | spin_unlock(&p->d_lock); | |
946e51f2 | 157 | next = p->d_child.next; |
2fd6b7f5 NP |
158 | p = parent; |
159 | if (next != &parent->d_subdirs) | |
1ce12bad | 160 | break; |
1ce12bad IK |
161 | } |
162 | } | |
946e51f2 | 163 | ret = list_entry(next, struct dentry, d_child); |
2fd6b7f5 NP |
164 | |
165 | spin_lock_nested(&ret->d_lock, DENTRY_D_LOCK_NESTED); | |
166 | /* Negative dentry - try next */ | |
167 | if (!simple_positive(ret)) { | |
c14cc63a | 168 | spin_unlock(&p->d_lock); |
1d6f2097 | 169 | lock_set_subclass(&ret->d_lock.dep_map, 0, _RET_IP_); |
2fd6b7f5 NP |
170 | p = ret; |
171 | goto again; | |
172 | } | |
173 | dget_dlock(ret); | |
174 | spin_unlock(&ret->d_lock); | |
175 | spin_unlock(&p->d_lock); | |
e7854723 | 176 | spin_unlock(&sbi->lookup_lock); |
2fd6b7f5 NP |
177 | |
178 | dput(prev); | |
179 | ||
180 | return ret; | |
1ce12bad IK |
181 | } |
182 | ||
3a15e2ab IK |
183 | /* |
184 | * Check a direct mount point for busyness. | |
185 | * Direct mounts have similar expiry semantics to tree mounts. | |
186 | * The tree is not busy iff no mountpoints are busy and there are no | |
187 | * autofs submounts. | |
188 | */ | |
189 | static int autofs4_direct_busy(struct vfsmount *mnt, | |
190 | struct dentry *top, | |
191 | unsigned long timeout, | |
192 | int do_now) | |
193 | { | |
a455589f | 194 | DPRINTK("top %p %pd", top, top); |
3a15e2ab | 195 | |
3a15e2ab IK |
196 | /* If it's busy update the expiry counters */ |
197 | if (!may_umount_tree(mnt)) { | |
198 | struct autofs_info *ino = autofs4_dentry_ino(top); | |
199 | if (ino) | |
200 | ino->last_used = jiffies; | |
201 | return 1; | |
202 | } | |
203 | ||
204 | /* Timeout of a direct mount is determined by its top dentry */ | |
205 | if (!autofs4_can_expire(top, timeout, do_now)) | |
206 | return 1; | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
1da177e4 LT |
211 | /* Check a directory tree of mount points for busyness |
212 | * The tree is not busy iff no mountpoints are busy | |
1da177e4 | 213 | */ |
1f5f2c30 IK |
214 | static int autofs4_tree_busy(struct vfsmount *mnt, |
215 | struct dentry *top, | |
216 | unsigned long timeout, | |
217 | int do_now) | |
1da177e4 | 218 | { |
e0a7aae9 | 219 | struct autofs_info *top_ino = autofs4_dentry_ino(top); |
1ce12bad | 220 | struct dentry *p; |
1da177e4 | 221 | |
a455589f | 222 | DPRINTK("top %p %pd", top, top); |
1da177e4 LT |
223 | |
224 | /* Negative dentry - give up */ | |
225 | if (!simple_positive(top)) | |
1f5f2c30 | 226 | return 1; |
1da177e4 | 227 | |
2fd6b7f5 NP |
228 | p = NULL; |
229 | while ((p = get_next_positive_dentry(p, top))) { | |
a455589f | 230 | DPRINTK("dentry %p %pd", p, p); |
1da177e4 | 231 | |
1aff3c8b IK |
232 | /* |
233 | * Is someone visiting anywhere in the subtree ? | |
234 | * If there's no mount we need to check the usage | |
235 | * count for the autofs dentry. | |
e0a7aae9 | 236 | * If the fs is busy update the expiry counter. |
1aff3c8b | 237 | */ |
1ce12bad | 238 | if (d_mountpoint(p)) { |
1ce12bad | 239 | if (autofs4_mount_busy(mnt, p)) { |
e0a7aae9 | 240 | top_ino->last_used = jiffies; |
1ce12bad | 241 | dput(p); |
1f5f2c30 | 242 | return 1; |
1da177e4 | 243 | } |
1aff3c8b | 244 | } else { |
e0a7aae9 | 245 | struct autofs_info *ino = autofs4_dentry_ino(p); |
1aff3c8b IK |
246 | unsigned int ino_count = atomic_read(&ino->count); |
247 | ||
248 | /* allow for dget above and top is already dgot */ | |
249 | if (p == top) | |
250 | ino_count += 2; | |
251 | else | |
252 | ino_count++; | |
253 | ||
84d08fa8 | 254 | if (d_count(p) > ino_count) { |
e0a7aae9 | 255 | top_ino->last_used = jiffies; |
1aff3c8b IK |
256 | dput(p); |
257 | return 1; | |
258 | } | |
1da177e4 | 259 | } |
1da177e4 | 260 | } |
1aff3c8b IK |
261 | |
262 | /* Timeout of a tree mount is ultimately determined by its top dentry */ | |
263 | if (!autofs4_can_expire(top, timeout, do_now)) | |
264 | return 1; | |
265 | ||
1f5f2c30 | 266 | return 0; |
1da177e4 LT |
267 | } |
268 | ||
269 | static struct dentry *autofs4_check_leaves(struct vfsmount *mnt, | |
270 | struct dentry *parent, | |
271 | unsigned long timeout, | |
272 | int do_now) | |
273 | { | |
1ce12bad | 274 | struct dentry *p; |
1da177e4 | 275 | |
a455589f | 276 | DPRINTK("parent %p %pd", parent, parent); |
1da177e4 | 277 | |
2fd6b7f5 NP |
278 | p = NULL; |
279 | while ((p = get_next_positive_dentry(p, parent))) { | |
a455589f | 280 | DPRINTK("dentry %p %pd", p, p); |
1da177e4 | 281 | |
1ce12bad | 282 | if (d_mountpoint(p)) { |
e0a7aae9 IK |
283 | /* Can we umount this guy */ |
284 | if (autofs4_mount_busy(mnt, p)) | |
2fd6b7f5 | 285 | continue; |
1da177e4 | 286 | |
e0a7aae9 IK |
287 | /* Can we expire this guy */ |
288 | if (autofs4_can_expire(p, timeout, do_now)) | |
1ce12bad | 289 | return p; |
1da177e4 | 290 | } |
1da177e4 | 291 | } |
1da177e4 LT |
292 | return NULL; |
293 | } | |
294 | ||
3a15e2ab | 295 | /* Check if we can expire a direct mount (possibly a tree) */ |
8d7b48e0 IK |
296 | struct dentry *autofs4_expire_direct(struct super_block *sb, |
297 | struct vfsmount *mnt, | |
298 | struct autofs_sb_info *sbi, | |
299 | int how) | |
3a15e2ab IK |
300 | { |
301 | unsigned long timeout; | |
302 | struct dentry *root = dget(sb->s_root); | |
303 | int do_now = how & AUTOFS_EXP_IMMEDIATE; | |
b5b80177 | 304 | struct autofs_info *ino; |
3a15e2ab | 305 | |
c0ba7e51 | 306 | if (!root) |
3a15e2ab IK |
307 | return NULL; |
308 | ||
309 | now = jiffies; | |
310 | timeout = sbi->exp_timeout; | |
311 | ||
3a15e2ab | 312 | spin_lock(&sbi->fs_lock); |
b5b80177 IK |
313 | ino = autofs4_dentry_ino(root); |
314 | /* No point expiring a pending mount */ | |
f9398c23 IK |
315 | if (ino->flags & AUTOFS_INF_PENDING) |
316 | goto out; | |
3a15e2ab | 317 | if (!autofs4_direct_busy(mnt, root, timeout, do_now)) { |
4d885f90 | 318 | ino->flags |= AUTOFS_INF_NO_RCU; |
3a15e2ab | 319 | spin_unlock(&sbi->fs_lock); |
4d885f90 N |
320 | synchronize_rcu(); |
321 | spin_lock(&sbi->fs_lock); | |
322 | if (!autofs4_direct_busy(mnt, root, timeout, do_now)) { | |
323 | ino->flags |= AUTOFS_INF_EXPIRING; | |
324 | smp_mb(); | |
325 | ino->flags &= ~AUTOFS_INF_NO_RCU; | |
326 | init_completion(&ino->expire_complete); | |
327 | spin_unlock(&sbi->fs_lock); | |
328 | return root; | |
329 | } | |
330 | ino->flags &= ~AUTOFS_INF_NO_RCU; | |
3a15e2ab | 331 | } |
f9398c23 | 332 | out: |
3a15e2ab IK |
333 | spin_unlock(&sbi->fs_lock); |
334 | dput(root); | |
335 | ||
336 | return NULL; | |
337 | } | |
338 | ||
a5d1dba1 N |
339 | /* Check if 'dentry' should expire, or return a nearby |
340 | * dentry that is suitable. | |
341 | * If returned dentry is different from arg dentry, | |
342 | * then a dget() reference was taken, else not. | |
343 | */ | |
344 | static struct dentry *should_expire(struct dentry *dentry, | |
345 | struct vfsmount *mnt, | |
346 | unsigned long timeout, | |
347 | int how) | |
348 | { | |
349 | int do_now = how & AUTOFS_EXP_IMMEDIATE; | |
350 | int exp_leaves = how & AUTOFS_EXP_LEAVES; | |
351 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
352 | unsigned int ino_count; | |
353 | ||
354 | /* No point expiring a pending mount */ | |
355 | if (ino->flags & AUTOFS_INF_PENDING) | |
356 | return NULL; | |
357 | ||
358 | /* | |
359 | * Case 1: (i) indirect mount or top level pseudo direct mount | |
360 | * (autofs-4.1). | |
361 | * (ii) indirect mount with offset mount, check the "/" | |
362 | * offset (autofs-5.0+). | |
363 | */ | |
364 | if (d_mountpoint(dentry)) { | |
a455589f | 365 | DPRINTK("checking mountpoint %p %pd", dentry, dentry); |
a5d1dba1 N |
366 | |
367 | /* Can we umount this guy */ | |
368 | if (autofs4_mount_busy(mnt, dentry)) | |
369 | return NULL; | |
370 | ||
371 | /* Can we expire this guy */ | |
372 | if (autofs4_can_expire(dentry, timeout, do_now)) | |
373 | return dentry; | |
374 | return NULL; | |
375 | } | |
376 | ||
2b0143b5 | 377 | if (d_really_is_positive(dentry) && d_is_symlink(dentry)) { |
a455589f | 378 | DPRINTK("checking symlink %p %pd", dentry, dentry); |
a5d1dba1 N |
379 | /* |
380 | * A symlink can't be "busy" in the usual sense so | |
381 | * just check last used for expire timeout. | |
382 | */ | |
383 | if (autofs4_can_expire(dentry, timeout, do_now)) | |
384 | return dentry; | |
385 | return NULL; | |
386 | } | |
387 | ||
388 | if (simple_empty(dentry)) | |
389 | return NULL; | |
390 | ||
391 | /* Case 2: tree mount, expire iff entire tree is not busy */ | |
392 | if (!exp_leaves) { | |
393 | /* Path walk currently on this dentry? */ | |
394 | ino_count = atomic_read(&ino->count) + 1; | |
395 | if (d_count(dentry) > ino_count) | |
396 | return NULL; | |
397 | ||
398 | if (!autofs4_tree_busy(mnt, dentry, timeout, do_now)) | |
399 | return dentry; | |
400 | /* | |
401 | * Case 3: pseudo direct mount, expire individual leaves | |
402 | * (autofs-4.1). | |
403 | */ | |
404 | } else { | |
405 | /* Path walk currently on this dentry? */ | |
406 | struct dentry *expired; | |
407 | ino_count = atomic_read(&ino->count) + 1; | |
408 | if (d_count(dentry) > ino_count) | |
409 | return NULL; | |
410 | ||
411 | expired = autofs4_check_leaves(mnt, dentry, timeout, do_now); | |
412 | if (expired) { | |
413 | if (expired == dentry) | |
414 | dput(dentry); | |
415 | return expired; | |
416 | } | |
417 | } | |
418 | return NULL; | |
419 | } | |
1da177e4 LT |
420 | /* |
421 | * Find an eligible tree to time-out | |
422 | * A tree is eligible if :- | |
423 | * - it is unused by any user process | |
424 | * - it has been unused for exp_timeout time | |
425 | */ | |
8d7b48e0 IK |
426 | struct dentry *autofs4_expire_indirect(struct super_block *sb, |
427 | struct vfsmount *mnt, | |
428 | struct autofs_sb_info *sbi, | |
429 | int how) | |
1da177e4 LT |
430 | { |
431 | unsigned long timeout; | |
432 | struct dentry *root = sb->s_root; | |
2fd6b7f5 | 433 | struct dentry *dentry; |
a5d1dba1 | 434 | struct dentry *expired; |
97e7449a | 435 | struct autofs_info *ino; |
1da177e4 | 436 | |
c0ba7e51 | 437 | if (!root) |
1da177e4 LT |
438 | return NULL; |
439 | ||
440 | now = jiffies; | |
441 | timeout = sbi->exp_timeout; | |
442 | ||
2fd6b7f5 | 443 | dentry = NULL; |
d4a85e35 | 444 | while ((dentry = get_next_positive_subdir(dentry, root))) { |
97e7449a | 445 | spin_lock(&sbi->fs_lock); |
4d885f90 N |
446 | ino = autofs4_dentry_ino(dentry); |
447 | if (ino->flags & AUTOFS_INF_NO_RCU) | |
448 | expired = NULL; | |
449 | else | |
450 | expired = should_expire(dentry, mnt, timeout, how); | |
451 | if (!expired) { | |
452 | spin_unlock(&sbi->fs_lock); | |
453 | continue; | |
454 | } | |
455 | ino = autofs4_dentry_ino(expired); | |
456 | ino->flags |= AUTOFS_INF_NO_RCU; | |
457 | spin_unlock(&sbi->fs_lock); | |
458 | synchronize_rcu(); | |
459 | spin_lock(&sbi->fs_lock); | |
460 | if (should_expire(expired, mnt, timeout, how)) { | |
a5d1dba1 | 461 | if (expired != dentry) |
1da177e4 | 462 | dput(dentry); |
a5d1dba1 | 463 | goto found; |
1da177e4 | 464 | } |
4d885f90 N |
465 | |
466 | ino->flags &= ~AUTOFS_INF_NO_RCU; | |
467 | if (expired != dentry) | |
468 | dput(expired); | |
97e7449a | 469 | spin_unlock(&sbi->fs_lock); |
1da177e4 | 470 | } |
1da177e4 | 471 | return NULL; |
afec570c IK |
472 | |
473 | found: | |
a455589f | 474 | DPRINTK("returning %p %pd", expired, expired); |
97e7449a | 475 | ino->flags |= AUTOFS_INF_EXPIRING; |
4d885f90 N |
476 | smp_mb(); |
477 | ino->flags &= ~AUTOFS_INF_NO_RCU; | |
6e60a9ab | 478 | init_completion(&ino->expire_complete); |
97e7449a | 479 | spin_unlock(&sbi->fs_lock); |
e7854723 | 480 | spin_lock(&sbi->lookup_lock); |
2fd6b7f5 NP |
481 | spin_lock(&expired->d_parent->d_lock); |
482 | spin_lock_nested(&expired->d_lock, DENTRY_D_LOCK_NESTED); | |
946e51f2 | 483 | list_move(&expired->d_parent->d_subdirs, &expired->d_child); |
2fd6b7f5 NP |
484 | spin_unlock(&expired->d_lock); |
485 | spin_unlock(&expired->d_parent->d_lock); | |
e7854723 | 486 | spin_unlock(&sbi->lookup_lock); |
afec570c | 487 | return expired; |
1da177e4 LT |
488 | } |
489 | ||
23bfc2a2 | 490 | int autofs4_expire_wait(struct dentry *dentry, int rcu_walk) |
06a35985 IK |
491 | { |
492 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
493 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
494 | int status; | |
495 | ||
496 | /* Block on any pending expire */ | |
4d885f90 N |
497 | if (!(ino->flags & (AUTOFS_INF_EXPIRING | AUTOFS_INF_NO_RCU))) |
498 | return 0; | |
499 | if (rcu_walk) | |
500 | return -ECHILD; | |
501 | ||
06a35985 IK |
502 | spin_lock(&sbi->fs_lock); |
503 | if (ino->flags & AUTOFS_INF_EXPIRING) { | |
504 | spin_unlock(&sbi->fs_lock); | |
505 | ||
a455589f | 506 | DPRINTK("waiting for expire %p name=%pd", dentry, dentry); |
06a35985 IK |
507 | |
508 | status = autofs4_wait(sbi, dentry, NFY_NONE); | |
509 | wait_for_completion(&ino->expire_complete); | |
510 | ||
511 | DPRINTK("expire done status=%d", status); | |
512 | ||
4b1ae27a | 513 | if (d_unhashed(dentry)) |
06a35985 IK |
514 | return -EAGAIN; |
515 | ||
516 | return status; | |
517 | } | |
518 | spin_unlock(&sbi->fs_lock); | |
519 | ||
520 | return 0; | |
521 | } | |
522 | ||
1da177e4 LT |
523 | /* Perform an expiry operation */ |
524 | int autofs4_expire_run(struct super_block *sb, | |
525 | struct vfsmount *mnt, | |
526 | struct autofs_sb_info *sbi, | |
527 | struct autofs_packet_expire __user *pkt_p) | |
528 | { | |
529 | struct autofs_packet_expire pkt; | |
97e7449a | 530 | struct autofs_info *ino; |
1da177e4 | 531 | struct dentry *dentry; |
97e7449a | 532 | int ret = 0; |
1da177e4 LT |
533 | |
534 | memset(&pkt,0,sizeof pkt); | |
535 | ||
536 | pkt.hdr.proto_version = sbi->version; | |
537 | pkt.hdr.type = autofs_ptype_expire; | |
538 | ||
3a15e2ab | 539 | if ((dentry = autofs4_expire_indirect(sb, mnt, sbi, 0)) == NULL) |
1da177e4 LT |
540 | return -EAGAIN; |
541 | ||
542 | pkt.len = dentry->d_name.len; | |
543 | memcpy(pkt.name, dentry->d_name.name, pkt.len); | |
544 | pkt.name[pkt.len] = '\0'; | |
545 | dput(dentry); | |
546 | ||
547 | if ( copy_to_user(pkt_p, &pkt, sizeof(struct autofs_packet_expire)) ) | |
97e7449a | 548 | ret = -EFAULT; |
1da177e4 | 549 | |
97e7449a IK |
550 | spin_lock(&sbi->fs_lock); |
551 | ino = autofs4_dentry_ino(dentry); | |
6ece08e6 N |
552 | /* avoid rapid-fire expire attempts if expiry fails */ |
553 | ino->last_used = now; | |
97e7449a | 554 | ino->flags &= ~AUTOFS_INF_EXPIRING; |
6e60a9ab | 555 | complete_all(&ino->expire_complete); |
97e7449a IK |
556 | spin_unlock(&sbi->fs_lock); |
557 | ||
558 | return ret; | |
1da177e4 LT |
559 | } |
560 | ||
56fcef75 IK |
561 | int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt, |
562 | struct autofs_sb_info *sbi, int when) | |
1da177e4 LT |
563 | { |
564 | struct dentry *dentry; | |
565 | int ret = -EAGAIN; | |
1da177e4 | 566 | |
a92daf6b | 567 | if (autofs_type_trigger(sbi->type)) |
56fcef75 | 568 | dentry = autofs4_expire_direct(sb, mnt, sbi, when); |
3a15e2ab | 569 | else |
56fcef75 | 570 | dentry = autofs4_expire_indirect(sb, mnt, sbi, when); |
3a15e2ab IK |
571 | |
572 | if (dentry) { | |
1f5f2c30 | 573 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
1da177e4 LT |
574 | |
575 | /* This is synchronous because it makes the daemon a | |
576 | little easier */ | |
1da177e4 | 577 | ret = autofs4_wait(sbi, dentry, NFY_EXPIRE); |
6e60a9ab | 578 | |
97e7449a | 579 | spin_lock(&sbi->fs_lock); |
6ece08e6 N |
580 | /* avoid rapid-fire expire attempts if expiry fails */ |
581 | ino->last_used = now; | |
1f5f2c30 | 582 | ino->flags &= ~AUTOFS_INF_EXPIRING; |
6e60a9ab | 583 | complete_all(&ino->expire_complete); |
97e7449a | 584 | spin_unlock(&sbi->fs_lock); |
1da177e4 LT |
585 | dput(dentry); |
586 | } | |
1f5f2c30 | 587 | |
1da177e4 LT |
588 | return ret; |
589 | } | |
590 | ||
56fcef75 IK |
591 | /* Call repeatedly until it returns -EAGAIN, meaning there's nothing |
592 | more to be done */ | |
593 | int autofs4_expire_multi(struct super_block *sb, struct vfsmount *mnt, | |
594 | struct autofs_sb_info *sbi, int __user *arg) | |
595 | { | |
596 | int do_now = 0; | |
597 | ||
598 | if (arg && get_user(do_now, arg)) | |
599 | return -EFAULT; | |
600 | ||
601 | return autofs4_do_expire_multi(sb, mnt, sbi, do_now); | |
602 | } | |
603 |