Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* -*- c -*- --------------------------------------------------------------- * |
2 | * | |
3 | * linux/fs/autofs/root.c | |
4 | * | |
5 | * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved | |
6 | * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org> | |
34ca959c | 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 | ||
16f7e0fe | 15 | #include <linux/capability.h> |
1da177e4 LT |
16 | #include <linux/errno.h> |
17 | #include <linux/stat.h> | |
18 | #include <linux/param.h> | |
19 | #include <linux/time.h> | |
1da177e4 LT |
20 | #include "autofs_i.h" |
21 | ||
22 | static int autofs4_dir_symlink(struct inode *,struct dentry *,const char *); | |
23 | static int autofs4_dir_unlink(struct inode *,struct dentry *); | |
24 | static int autofs4_dir_rmdir(struct inode *,struct dentry *); | |
25 | static int autofs4_dir_mkdir(struct inode *,struct dentry *,int); | |
26 | static int autofs4_root_ioctl(struct inode *, struct file *,unsigned int,unsigned long); | |
27 | static int autofs4_dir_open(struct inode *inode, struct file *file); | |
1da177e4 LT |
28 | static int autofs4_root_readdir(struct file * filp, void * dirent, filldir_t filldir); |
29 | static struct dentry *autofs4_lookup(struct inode *,struct dentry *, struct nameidata *); | |
34ca959c | 30 | static void *autofs4_follow_link(struct dentry *, struct nameidata *); |
1da177e4 | 31 | |
6d5cb926 IK |
32 | #define TRIGGER_FLAGS (LOOKUP_CONTINUE | LOOKUP_DIRECTORY) |
33 | #define TRIGGER_INTENTS (LOOKUP_OPEN | LOOKUP_CREATE) | |
34 | ||
4b6f5d20 | 35 | const struct file_operations autofs4_root_operations = { |
1da177e4 LT |
36 | .open = dcache_dir_open, |
37 | .release = dcache_dir_close, | |
38 | .read = generic_read_dir, | |
39 | .readdir = autofs4_root_readdir, | |
40 | .ioctl = autofs4_root_ioctl, | |
41 | }; | |
42 | ||
4b6f5d20 | 43 | const struct file_operations autofs4_dir_operations = { |
1da177e4 | 44 | .open = autofs4_dir_open, |
ff9cd499 | 45 | .release = dcache_dir_close, |
1da177e4 | 46 | .read = generic_read_dir, |
ff9cd499 | 47 | .readdir = dcache_readdir, |
1da177e4 LT |
48 | }; |
49 | ||
754661f1 | 50 | const struct inode_operations autofs4_indirect_root_inode_operations = { |
1da177e4 LT |
51 | .lookup = autofs4_lookup, |
52 | .unlink = autofs4_dir_unlink, | |
53 | .symlink = autofs4_dir_symlink, | |
54 | .mkdir = autofs4_dir_mkdir, | |
55 | .rmdir = autofs4_dir_rmdir, | |
56 | }; | |
57 | ||
754661f1 | 58 | const struct inode_operations autofs4_direct_root_inode_operations = { |
34ca959c | 59 | .lookup = autofs4_lookup, |
871f9434 IK |
60 | .unlink = autofs4_dir_unlink, |
61 | .mkdir = autofs4_dir_mkdir, | |
62 | .rmdir = autofs4_dir_rmdir, | |
34ca959c IK |
63 | .follow_link = autofs4_follow_link, |
64 | }; | |
65 | ||
754661f1 | 66 | const struct inode_operations autofs4_dir_inode_operations = { |
1da177e4 LT |
67 | .lookup = autofs4_lookup, |
68 | .unlink = autofs4_dir_unlink, | |
69 | .symlink = autofs4_dir_symlink, | |
70 | .mkdir = autofs4_dir_mkdir, | |
71 | .rmdir = autofs4_dir_rmdir, | |
72 | }; | |
73 | ||
74 | static int autofs4_root_readdir(struct file *file, void *dirent, | |
75 | filldir_t filldir) | |
76 | { | |
a4669ed8 | 77 | struct autofs_sb_info *sbi = autofs4_sbi(file->f_path.dentry->d_sb); |
1da177e4 LT |
78 | int oz_mode = autofs4_oz_mode(sbi); |
79 | ||
80 | DPRINTK("called, filp->f_pos = %lld", file->f_pos); | |
81 | ||
82 | /* | |
83 | * Don't set reghost flag if: | |
84 | * 1) f_pos is larger than zero -- we've already been here. | |
85 | * 2) we haven't even enabled reghosting in the 1st place. | |
86 | * 3) this is the daemon doing a readdir | |
87 | */ | |
88 | if (oz_mode && file->f_pos == 0 && sbi->reghost_enabled) | |
89 | sbi->needs_reghost = 1; | |
90 | ||
91 | DPRINTK("needs_reghost = %d", sbi->needs_reghost); | |
92 | ||
f360ce3b | 93 | return dcache_readdir(file, dirent, filldir); |
1da177e4 LT |
94 | } |
95 | ||
1da177e4 LT |
96 | static int autofs4_dir_open(struct inode *inode, struct file *file) |
97 | { | |
a4669ed8 | 98 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 | 99 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
f360ce3b | 100 | |
1da177e4 LT |
101 | DPRINTK("file=%p dentry=%p %.*s", |
102 | file, dentry, dentry->d_name.len, dentry->d_name.name); | |
103 | ||
104 | if (autofs4_oz_mode(sbi)) | |
105 | goto out; | |
106 | ||
ff9cd499 IK |
107 | /* |
108 | * An empty directory in an autofs file system is always a | |
109 | * mount point. The daemon must have failed to mount this | |
110 | * during lookup so it doesn't exist. This can happen, for | |
111 | * example, if user space returns an incorrect status for a | |
112 | * mount request. Otherwise we're doing a readdir on the | |
113 | * autofs file system so just let the libfs routines handle | |
114 | * it. | |
115 | */ | |
116 | spin_lock(&dcache_lock); | |
117 | if (!d_mountpoint(dentry) && __simple_empty(dentry)) { | |
1da177e4 | 118 | spin_unlock(&dcache_lock); |
ff9cd499 | 119 | return -ENOENT; |
1da177e4 | 120 | } |
ff9cd499 | 121 | spin_unlock(&dcache_lock); |
1da177e4 | 122 | |
1da177e4 | 123 | out: |
ff9cd499 | 124 | return dcache_dir_open(inode, file); |
1da177e4 LT |
125 | } |
126 | ||
862b110f | 127 | static int try_to_fill_dentry(struct dentry *dentry, int flags) |
1da177e4 | 128 | { |
862b110f | 129 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
718c604a | 130 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
9d2de6ad | 131 | int status; |
1da177e4 LT |
132 | |
133 | /* Block on any pending expiry here; invalidate the dentry | |
134 | when expiration is done to trigger mount request with a new | |
135 | dentry */ | |
97e7449a IK |
136 | spin_lock(&sbi->fs_lock); |
137 | if (ino->flags & AUTOFS_INF_EXPIRING) { | |
138 | spin_unlock(&sbi->fs_lock); | |
139 | ||
1da177e4 LT |
140 | DPRINTK("waiting for expire %p name=%.*s", |
141 | dentry, dentry->d_name.len, dentry->d_name.name); | |
142 | ||
143 | status = autofs4_wait(sbi, dentry, NFY_NONE); | |
6e60a9ab | 144 | wait_for_completion(&ino->expire_complete); |
718c604a | 145 | |
1da177e4 | 146 | DPRINTK("expire done status=%d", status); |
718c604a | 147 | |
1684b2bb IK |
148 | /* |
149 | * If the directory still exists the mount request must | |
150 | * continue otherwise it can't be followed at the right | |
151 | * time during the walk. | |
152 | */ | |
153 | status = d_invalidate(dentry); | |
154 | if (status != -EBUSY) | |
f50b6f86 | 155 | return -EAGAIN; |
1da177e4 | 156 | |
97e7449a IK |
157 | goto cont; |
158 | } | |
159 | spin_unlock(&sbi->fs_lock); | |
160 | cont: | |
1da177e4 LT |
161 | DPRINTK("dentry=%p %.*s ino=%p", |
162 | dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
163 | ||
718c604a IK |
164 | /* |
165 | * Wait for a pending mount, triggering one if there | |
166 | * isn't one already | |
167 | */ | |
1da177e4 LT |
168 | if (dentry->d_inode == NULL) { |
169 | DPRINTK("waiting for mount name=%.*s", | |
170 | dentry->d_name.len, dentry->d_name.name); | |
171 | ||
172 | status = autofs4_wait(sbi, dentry, NFY_MOUNT); | |
718c604a | 173 | |
1da177e4 LT |
174 | DPRINTK("mount done status=%d", status); |
175 | ||
1da177e4 LT |
176 | /* Turn this into a real negative dentry? */ |
177 | if (status == -ENOENT) { | |
1da177e4 LT |
178 | spin_lock(&dentry->d_lock); |
179 | dentry->d_flags &= ~DCACHE_AUTOFS_PENDING; | |
180 | spin_unlock(&dentry->d_lock); | |
34ca959c | 181 | return status; |
1da177e4 LT |
182 | } else if (status) { |
183 | /* Return a negative dentry, but leave it "pending" */ | |
34ca959c | 184 | return status; |
1da177e4 LT |
185 | } |
186 | /* Trigger mount for path component or follow link */ | |
26e81b31 IK |
187 | } else if (dentry->d_flags & DCACHE_AUTOFS_PENDING || |
188 | flags & (TRIGGER_FLAGS | TRIGGER_INTENTS) || | |
1da177e4 LT |
189 | current->link_count) { |
190 | DPRINTK("waiting for mount name=%.*s", | |
191 | dentry->d_name.len, dentry->d_name.name); | |
192 | ||
193 | spin_lock(&dentry->d_lock); | |
194 | dentry->d_flags |= DCACHE_AUTOFS_PENDING; | |
195 | spin_unlock(&dentry->d_lock); | |
196 | status = autofs4_wait(sbi, dentry, NFY_MOUNT); | |
197 | ||
198 | DPRINTK("mount done status=%d", status); | |
199 | ||
200 | if (status) { | |
201 | spin_lock(&dentry->d_lock); | |
202 | dentry->d_flags &= ~DCACHE_AUTOFS_PENDING; | |
203 | spin_unlock(&dentry->d_lock); | |
34ca959c | 204 | return status; |
1da177e4 LT |
205 | } |
206 | } | |
207 | ||
e0a7aae9 IK |
208 | /* Initialize expiry counter after successful mount */ |
209 | if (ino) | |
210 | ino->last_used = jiffies; | |
211 | ||
1da177e4 LT |
212 | spin_lock(&dentry->d_lock); |
213 | dentry->d_flags &= ~DCACHE_AUTOFS_PENDING; | |
214 | spin_unlock(&dentry->d_lock); | |
03379044 | 215 | |
9d2de6ad | 216 | return 0; |
34ca959c IK |
217 | } |
218 | ||
219 | /* For autofs direct mounts the follow link triggers the mount */ | |
220 | static void *autofs4_follow_link(struct dentry *dentry, struct nameidata *nd) | |
221 | { | |
222 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
a5370553 | 223 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
34ca959c IK |
224 | int oz_mode = autofs4_oz_mode(sbi); |
225 | unsigned int lookup_type; | |
226 | int status; | |
227 | ||
228 | DPRINTK("dentry=%p %.*s oz_mode=%d nd->flags=%d", | |
229 | dentry, dentry->d_name.len, dentry->d_name.name, oz_mode, | |
230 | nd->flags); | |
6e60a9ab IK |
231 | /* |
232 | * For an expire of a covered direct or offset mount we need | |
233 | * to beeak out of follow_down() at the autofs mount trigger | |
234 | * (d_mounted--), so we can see the expiring flag, and manage | |
235 | * the blocking and following here until the expire is completed. | |
236 | */ | |
237 | if (oz_mode) { | |
238 | spin_lock(&sbi->fs_lock); | |
239 | if (ino->flags & AUTOFS_INF_EXPIRING) { | |
240 | spin_unlock(&sbi->fs_lock); | |
241 | /* Follow down to our covering mount. */ | |
242 | if (!follow_down(&nd->path.mnt, &nd->path.dentry)) | |
243 | goto done; | |
244 | /* | |
245 | * We shouldn't need to do this but we have no way | |
246 | * of knowing what may have been done so try a follow | |
247 | * just in case. | |
248 | */ | |
249 | autofs4_follow_mount(&nd->path.mnt, &nd->path.dentry); | |
250 | goto done; | |
251 | } | |
252 | spin_unlock(&sbi->fs_lock); | |
34ca959c | 253 | goto done; |
6e60a9ab | 254 | } |
34ca959c | 255 | |
6e60a9ab | 256 | /* If an expire request is pending everyone must wait. */ |
97e7449a IK |
257 | spin_lock(&sbi->fs_lock); |
258 | if (ino->flags & AUTOFS_INF_EXPIRING) { | |
259 | spin_unlock(&sbi->fs_lock); | |
260 | ||
871f9434 IK |
261 | DPRINTK("waiting for active request %p name=%.*s", |
262 | dentry, dentry->d_name.len, dentry->d_name.name); | |
263 | ||
264 | status = autofs4_wait(sbi, dentry, NFY_NONE); | |
6e60a9ab | 265 | wait_for_completion(&ino->expire_complete); |
871f9434 IK |
266 | |
267 | DPRINTK("request done status=%d", status); | |
34ca959c | 268 | |
97e7449a IK |
269 | goto cont; |
270 | } | |
271 | spin_unlock(&sbi->fs_lock); | |
272 | cont: | |
6e60a9ab IK |
273 | /* We trigger a mount for almost all flags */ |
274 | lookup_type = nd->flags & (TRIGGER_FLAGS | TRIGGER_INTENTS); | |
275 | if (!(lookup_type || dentry->d_flags & DCACHE_AUTOFS_PENDING)) | |
276 | goto done; | |
277 | ||
871f9434 | 278 | /* |
6e60a9ab IK |
279 | * If the dentry contains directories then it is an autofs |
280 | * multi-mount with no root mount offset. So don't try to | |
281 | * mount it again. | |
871f9434 IK |
282 | */ |
283 | spin_lock(&dcache_lock); | |
26e81b31 IK |
284 | if (dentry->d_flags & DCACHE_AUTOFS_PENDING || |
285 | (!d_mountpoint(dentry) && __simple_empty(dentry))) { | |
871f9434 IK |
286 | spin_unlock(&dcache_lock); |
287 | ||
288 | status = try_to_fill_dentry(dentry, 0); | |
289 | if (status) | |
290 | goto out_error; | |
291 | ||
6e60a9ab | 292 | goto follow; |
34ca959c | 293 | } |
871f9434 | 294 | spin_unlock(&dcache_lock); |
6e60a9ab IK |
295 | follow: |
296 | /* | |
297 | * If there is no root mount it must be an autofs | |
298 | * multi-mount with no root offset so we don't need | |
299 | * to follow it. | |
300 | */ | |
301 | if (d_mountpoint(dentry)) { | |
302 | if (!autofs4_follow_mount(&nd->path.mnt, | |
303 | &nd->path.dentry)) { | |
304 | status = -ENOENT; | |
305 | goto out_error; | |
306 | } | |
307 | } | |
34ca959c IK |
308 | |
309 | done: | |
310 | return NULL; | |
311 | ||
312 | out_error: | |
1d957f9b | 313 | path_put(&nd->path); |
34ca959c | 314 | return ERR_PTR(status); |
1da177e4 LT |
315 | } |
316 | ||
317 | /* | |
318 | * Revalidate is called on every cache lookup. Some of those | |
319 | * cache lookups may actually happen while the dentry is not | |
320 | * yet completely filled in, and revalidate has to delay such | |
321 | * lookups.. | |
322 | */ | |
718c604a | 323 | static int autofs4_revalidate(struct dentry *dentry, struct nameidata *nd) |
1da177e4 | 324 | { |
718c604a | 325 | struct inode *dir = dentry->d_parent->d_inode; |
1da177e4 LT |
326 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); |
327 | int oz_mode = autofs4_oz_mode(sbi); | |
328 | int flags = nd ? nd->flags : 0; | |
bcdc5e01 | 329 | int status = 1; |
1da177e4 LT |
330 | |
331 | /* Pending dentry */ | |
97e7449a | 332 | spin_lock(&sbi->fs_lock); |
1da177e4 | 333 | if (autofs4_ispending(dentry)) { |
bcdc5e01 | 334 | /* The daemon never causes a mount to trigger */ |
97e7449a IK |
335 | spin_unlock(&sbi->fs_lock); |
336 | ||
bcdc5e01 IK |
337 | if (oz_mode) |
338 | return 1; | |
339 | ||
340 | /* | |
341 | * A zero status is success otherwise we have a | |
342 | * negative error code. | |
343 | */ | |
344 | status = try_to_fill_dentry(dentry, flags); | |
345 | if (status == 0) | |
f50b6f86 IK |
346 | return 1; |
347 | ||
348 | /* | |
349 | * A status of EAGAIN here means that the dentry has gone | |
350 | * away while waiting for an expire to complete. If we are | |
351 | * racing with expire lookup will wait for it so this must | |
352 | * be a revalidate and we need to send it to lookup. | |
353 | */ | |
354 | if (status == -EAGAIN) | |
355 | return 0; | |
bcdc5e01 IK |
356 | |
357 | return status; | |
1da177e4 | 358 | } |
97e7449a | 359 | spin_unlock(&sbi->fs_lock); |
1da177e4 LT |
360 | |
361 | /* Negative dentry.. invalidate if "old" */ | |
362 | if (dentry->d_inode == NULL) | |
2d753e62 | 363 | return 0; |
1da177e4 LT |
364 | |
365 | /* Check for a non-mountpoint directory with no contents */ | |
366 | spin_lock(&dcache_lock); | |
367 | if (S_ISDIR(dentry->d_inode->i_mode) && | |
368 | !d_mountpoint(dentry) && | |
90a59c7c | 369 | __simple_empty(dentry)) { |
1da177e4 LT |
370 | DPRINTK("dentry=%p %.*s, emptydir", |
371 | dentry, dentry->d_name.len, dentry->d_name.name); | |
372 | spin_unlock(&dcache_lock); | |
97e7449a | 373 | |
bcdc5e01 IK |
374 | /* The daemon never causes a mount to trigger */ |
375 | if (oz_mode) | |
376 | return 1; | |
377 | ||
378 | /* | |
379 | * A zero status is success otherwise we have a | |
380 | * negative error code. | |
381 | */ | |
382 | status = try_to_fill_dentry(dentry, flags); | |
383 | if (status == 0) | |
384 | return 1; | |
385 | ||
386 | return status; | |
1da177e4 LT |
387 | } |
388 | spin_unlock(&dcache_lock); | |
389 | ||
1da177e4 LT |
390 | return 1; |
391 | } | |
392 | ||
34ca959c | 393 | void autofs4_dentry_release(struct dentry *de) |
1da177e4 LT |
394 | { |
395 | struct autofs_info *inf; | |
396 | ||
397 | DPRINTK("releasing %p", de); | |
398 | ||
399 | inf = autofs4_dentry_ino(de); | |
400 | de->d_fsdata = NULL; | |
401 | ||
402 | if (inf) { | |
f50b6f86 IK |
403 | struct autofs_sb_info *sbi = autofs4_sbi(de->d_sb); |
404 | ||
f50b6f86 | 405 | if (sbi) { |
5f6f4f28 | 406 | spin_lock(&sbi->lookup_lock); |
25767378 IK |
407 | if (!list_empty(&inf->active)) |
408 | list_del(&inf->active); | |
5f6f4f28 IK |
409 | if (!list_empty(&inf->expiring)) |
410 | list_del(&inf->expiring); | |
411 | spin_unlock(&sbi->lookup_lock); | |
f50b6f86 IK |
412 | } |
413 | ||
c3724b12 JM |
414 | inf->dentry = NULL; |
415 | inf->inode = NULL; | |
416 | ||
1da177e4 LT |
417 | autofs4_free_ino(inf); |
418 | } | |
419 | } | |
420 | ||
421 | /* For dentries of directories in the root dir */ | |
422 | static struct dentry_operations autofs4_root_dentry_operations = { | |
423 | .d_revalidate = autofs4_revalidate, | |
424 | .d_release = autofs4_dentry_release, | |
425 | }; | |
426 | ||
427 | /* For other dentries */ | |
428 | static struct dentry_operations autofs4_dentry_operations = { | |
429 | .d_revalidate = autofs4_revalidate, | |
430 | .d_release = autofs4_dentry_release, | |
431 | }; | |
432 | ||
25767378 IK |
433 | static struct dentry *autofs4_lookup_active(struct autofs_sb_info *sbi, struct dentry *parent, struct qstr *name) |
434 | { | |
435 | unsigned int len = name->len; | |
436 | unsigned int hash = name->hash; | |
437 | const unsigned char *str = name->name; | |
438 | struct list_head *p, *head; | |
439 | ||
440 | spin_lock(&dcache_lock); | |
441 | spin_lock(&sbi->lookup_lock); | |
442 | head = &sbi->active_list; | |
443 | list_for_each(p, head) { | |
444 | struct autofs_info *ino; | |
445 | struct dentry *dentry; | |
446 | struct qstr *qstr; | |
447 | ||
448 | ino = list_entry(p, struct autofs_info, active); | |
449 | dentry = ino->dentry; | |
450 | ||
451 | spin_lock(&dentry->d_lock); | |
452 | ||
453 | /* Already gone? */ | |
454 | if (atomic_read(&dentry->d_count) == 0) | |
455 | goto next; | |
456 | ||
457 | qstr = &dentry->d_name; | |
458 | ||
459 | if (dentry->d_name.hash != hash) | |
460 | goto next; | |
461 | if (dentry->d_parent != parent) | |
462 | goto next; | |
463 | ||
464 | if (qstr->len != len) | |
465 | goto next; | |
466 | if (memcmp(qstr->name, str, len)) | |
467 | goto next; | |
468 | ||
469 | if (d_unhashed(dentry)) { | |
470 | dget(dentry); | |
471 | spin_unlock(&dentry->d_lock); | |
472 | spin_unlock(&sbi->lookup_lock); | |
473 | spin_unlock(&dcache_lock); | |
474 | return dentry; | |
475 | } | |
476 | next: | |
477 | spin_unlock(&dentry->d_lock); | |
478 | } | |
479 | spin_unlock(&sbi->lookup_lock); | |
480 | spin_unlock(&dcache_lock); | |
481 | ||
482 | return NULL; | |
483 | } | |
484 | ||
5f6f4f28 | 485 | static struct dentry *autofs4_lookup_expiring(struct autofs_sb_info *sbi, struct dentry *parent, struct qstr *name) |
f50b6f86 IK |
486 | { |
487 | unsigned int len = name->len; | |
488 | unsigned int hash = name->hash; | |
489 | const unsigned char *str = name->name; | |
490 | struct list_head *p, *head; | |
491 | ||
492 | spin_lock(&dcache_lock); | |
5f6f4f28 IK |
493 | spin_lock(&sbi->lookup_lock); |
494 | head = &sbi->expiring_list; | |
f50b6f86 IK |
495 | list_for_each(p, head) { |
496 | struct autofs_info *ino; | |
497 | struct dentry *dentry; | |
498 | struct qstr *qstr; | |
499 | ||
5f6f4f28 | 500 | ino = list_entry(p, struct autofs_info, expiring); |
f50b6f86 IK |
501 | dentry = ino->dentry; |
502 | ||
503 | spin_lock(&dentry->d_lock); | |
504 | ||
505 | /* Bad luck, we've already been dentry_iput */ | |
506 | if (!dentry->d_inode) | |
507 | goto next; | |
508 | ||
509 | qstr = &dentry->d_name; | |
510 | ||
511 | if (dentry->d_name.hash != hash) | |
512 | goto next; | |
513 | if (dentry->d_parent != parent) | |
514 | goto next; | |
515 | ||
516 | if (qstr->len != len) | |
517 | goto next; | |
518 | if (memcmp(qstr->name, str, len)) | |
519 | goto next; | |
520 | ||
521 | if (d_unhashed(dentry)) { | |
f50b6f86 | 522 | dget(dentry); |
f50b6f86 | 523 | spin_unlock(&dentry->d_lock); |
5f6f4f28 | 524 | spin_unlock(&sbi->lookup_lock); |
f50b6f86 IK |
525 | spin_unlock(&dcache_lock); |
526 | return dentry; | |
527 | } | |
528 | next: | |
529 | spin_unlock(&dentry->d_lock); | |
530 | } | |
5f6f4f28 | 531 | spin_unlock(&sbi->lookup_lock); |
f50b6f86 IK |
532 | spin_unlock(&dcache_lock); |
533 | ||
534 | return NULL; | |
535 | } | |
536 | ||
1da177e4 LT |
537 | /* Lookups in the root directory */ |
538 | static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) | |
539 | { | |
540 | struct autofs_sb_info *sbi; | |
25767378 IK |
541 | struct autofs_info *ino; |
542 | struct dentry *expiring, *unhashed; | |
1da177e4 LT |
543 | int oz_mode; |
544 | ||
545 | DPRINTK("name = %.*s", | |
546 | dentry->d_name.len, dentry->d_name.name); | |
547 | ||
718c604a | 548 | /* File name too long to exist */ |
1da177e4 | 549 | if (dentry->d_name.len > NAME_MAX) |
718c604a | 550 | return ERR_PTR(-ENAMETOOLONG); |
1da177e4 LT |
551 | |
552 | sbi = autofs4_sbi(dir->i_sb); | |
1da177e4 | 553 | oz_mode = autofs4_oz_mode(sbi); |
718c604a | 554 | |
1da177e4 | 555 | DPRINTK("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d", |
a47afb0f | 556 | current->pid, task_pgrp_nr(current), sbi->catatonic, oz_mode); |
1da177e4 | 557 | |
5f6f4f28 IK |
558 | expiring = autofs4_lookup_expiring(sbi, dentry->d_parent, &dentry->d_name); |
559 | if (expiring) { | |
f50b6f86 IK |
560 | /* |
561 | * If we are racing with expire the request might not | |
562 | * be quite complete but the directory has been removed | |
563 | * so it must have been successful, so just wait for it. | |
564 | */ | |
25767378 | 565 | ino = autofs4_dentry_ino(expiring); |
97e7449a IK |
566 | spin_lock(&sbi->fs_lock); |
567 | if (ino->flags & AUTOFS_INF_EXPIRING) { | |
568 | spin_unlock(&sbi->fs_lock); | |
f50b6f86 | 569 | DPRINTK("wait for incomplete expire %p name=%.*s", |
5f6f4f28 IK |
570 | expiring, expiring->d_name.len, |
571 | expiring->d_name.name); | |
572 | autofs4_wait(sbi, expiring, NFY_NONE); | |
6e60a9ab | 573 | wait_for_completion(&ino->expire_complete); |
f50b6f86 | 574 | DPRINTK("request completed"); |
97e7449a | 575 | goto cont; |
f50b6f86 | 576 | } |
97e7449a IK |
577 | spin_unlock(&sbi->fs_lock); |
578 | cont: | |
5f6f4f28 IK |
579 | spin_lock(&sbi->lookup_lock); |
580 | if (!list_empty(&ino->expiring)) | |
581 | list_del_init(&ino->expiring); | |
582 | spin_unlock(&sbi->lookup_lock); | |
583 | dput(expiring); | |
f50b6f86 | 584 | } |
1da177e4 | 585 | |
25767378 IK |
586 | unhashed = autofs4_lookup_active(sbi, dentry->d_parent, &dentry->d_name); |
587 | if (unhashed) | |
588 | dentry = unhashed; | |
589 | else { | |
590 | /* | |
591 | * Mark the dentry incomplete but don't hash it. We do this | |
592 | * to serialize our inode creation operations (symlink and | |
593 | * mkdir) which prevents deadlock during the callback to | |
594 | * the daemon. Subsequent user space lookups for the same | |
595 | * dentry are placed on the wait queue while the daemon | |
596 | * itself is allowed passage unresticted so the create | |
597 | * operation itself can then hash the dentry. Finally, | |
598 | * we check for the hashed dentry and return the newly | |
599 | * hashed dentry. | |
600 | */ | |
601 | dentry->d_op = &autofs4_root_dentry_operations; | |
602 | ||
603 | /* | |
604 | * And we need to ensure that the same dentry is used for | |
605 | * all following lookup calls until it is hashed so that | |
606 | * the dentry flags are persistent throughout the request. | |
607 | */ | |
608 | ino = autofs4_init_ino(NULL, sbi, 0555); | |
609 | if (!ino) | |
610 | return ERR_PTR(-ENOMEM); | |
611 | ||
612 | dentry->d_fsdata = ino; | |
613 | ino->dentry = dentry; | |
614 | ||
615 | spin_lock(&sbi->lookup_lock); | |
616 | list_add(&ino->active, &sbi->active_list); | |
617 | spin_unlock(&sbi->lookup_lock); | |
5f6f4f28 | 618 | |
25767378 IK |
619 | d_instantiate(dentry, NULL); |
620 | } | |
5f6f4f28 | 621 | |
1da177e4 LT |
622 | if (!oz_mode) { |
623 | spin_lock(&dentry->d_lock); | |
624 | dentry->d_flags |= DCACHE_AUTOFS_PENDING; | |
625 | spin_unlock(&dentry->d_lock); | |
c432c258 IK |
626 | if (dentry->d_op && dentry->d_op->d_revalidate) { |
627 | mutex_unlock(&dir->i_mutex); | |
628 | (dentry->d_op->d_revalidate)(dentry, nd); | |
629 | mutex_lock(&dir->i_mutex); | |
630 | } | |
1da177e4 LT |
631 | } |
632 | ||
633 | /* | |
634 | * If we are still pending, check if we had to handle | |
635 | * a signal. If so we can force a restart.. | |
636 | */ | |
637 | if (dentry->d_flags & DCACHE_AUTOFS_PENDING) { | |
638 | /* See if we were interrupted */ | |
639 | if (signal_pending(current)) { | |
640 | sigset_t *sigset = ¤t->pending.signal; | |
641 | if (sigismember (sigset, SIGKILL) || | |
642 | sigismember (sigset, SIGQUIT) || | |
643 | sigismember (sigset, SIGINT)) { | |
25767378 IK |
644 | if (unhashed) |
645 | dput(unhashed); | |
1da177e4 LT |
646 | return ERR_PTR(-ERESTARTNOINTR); |
647 | } | |
648 | } | |
25767378 IK |
649 | if (!oz_mode) { |
650 | spin_lock(&dentry->d_lock); | |
651 | dentry->d_flags &= ~DCACHE_AUTOFS_PENDING; | |
652 | spin_unlock(&dentry->d_lock); | |
653 | } | |
1da177e4 LT |
654 | } |
655 | ||
656 | /* | |
657 | * If this dentry is unhashed, then we shouldn't honour this | |
c9ffec48 IK |
658 | * lookup. Returning ENOENT here doesn't do the right thing |
659 | * for all system calls, but it should be OK for the operations | |
660 | * we permit from an autofs. | |
1da177e4 | 661 | */ |
1864f7bd | 662 | if (!oz_mode && d_unhashed(dentry)) { |
c9ffec48 IK |
663 | /* |
664 | * A user space application can (and has done in the past) | |
665 | * remove and re-create this directory during the callback. | |
666 | * This can leave us with an unhashed dentry, but a | |
667 | * successful mount! So we need to perform another | |
668 | * cached lookup in case the dentry now exists. | |
669 | */ | |
670 | struct dentry *parent = dentry->d_parent; | |
671 | struct dentry *new = d_lookup(parent, &dentry->d_name); | |
672 | if (new != NULL) | |
673 | dentry = new; | |
674 | else | |
675 | dentry = ERR_PTR(-ENOENT); | |
676 | ||
25767378 IK |
677 | if (unhashed) |
678 | dput(unhashed); | |
679 | ||
c9ffec48 | 680 | return dentry; |
f50b6f86 IK |
681 | } |
682 | ||
25767378 IK |
683 | if (unhashed) |
684 | return unhashed; | |
685 | ||
1da177e4 LT |
686 | return NULL; |
687 | } | |
688 | ||
689 | static int autofs4_dir_symlink(struct inode *dir, | |
690 | struct dentry *dentry, | |
691 | const char *symname) | |
692 | { | |
693 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); | |
694 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
1aff3c8b | 695 | struct autofs_info *p_ino; |
1da177e4 LT |
696 | struct inode *inode; |
697 | char *cp; | |
698 | ||
699 | DPRINTK("%s <- %.*s", symname, | |
700 | dentry->d_name.len, dentry->d_name.name); | |
701 | ||
702 | if (!autofs4_oz_mode(sbi)) | |
703 | return -EACCES; | |
704 | ||
705 | ino = autofs4_init_ino(ino, sbi, S_IFLNK | 0555); | |
25767378 IK |
706 | if (!ino) |
707 | return -ENOMEM; | |
1da177e4 | 708 | |
25767378 IK |
709 | spin_lock(&sbi->lookup_lock); |
710 | if (!list_empty(&ino->active)) | |
711 | list_del_init(&ino->active); | |
712 | spin_unlock(&sbi->lookup_lock); | |
1da177e4 | 713 | |
ef581a74 | 714 | ino->size = strlen(symname); |
25767378 IK |
715 | cp = kmalloc(ino->size + 1, GFP_KERNEL); |
716 | if (!cp) { | |
717 | if (!dentry->d_fsdata) | |
718 | kfree(ino); | |
719 | return -ENOMEM; | |
1da177e4 LT |
720 | } |
721 | ||
722 | strcpy(cp, symname); | |
723 | ||
724 | inode = autofs4_get_inode(dir->i_sb, ino); | |
25767378 IK |
725 | if (!inode) { |
726 | kfree(cp); | |
727 | if (!dentry->d_fsdata) | |
728 | kfree(ino); | |
729 | return -ENOMEM; | |
730 | } | |
1864f7bd | 731 | d_add(dentry, inode); |
1da177e4 LT |
732 | |
733 | if (dir == dir->i_sb->s_root->d_inode) | |
734 | dentry->d_op = &autofs4_root_dentry_operations; | |
735 | else | |
736 | dentry->d_op = &autofs4_dentry_operations; | |
737 | ||
738 | dentry->d_fsdata = ino; | |
739 | ino->dentry = dget(dentry); | |
1aff3c8b IK |
740 | atomic_inc(&ino->count); |
741 | p_ino = autofs4_dentry_ino(dentry->d_parent); | |
742 | if (p_ino && dentry->d_parent != dentry) | |
743 | atomic_inc(&p_ino->count); | |
1da177e4 LT |
744 | ino->inode = inode; |
745 | ||
25767378 | 746 | ino->u.symlink = cp; |
1da177e4 LT |
747 | dir->i_mtime = CURRENT_TIME; |
748 | ||
749 | return 0; | |
750 | } | |
751 | ||
752 | /* | |
753 | * NOTE! | |
754 | * | |
755 | * Normal filesystems would do a "d_delete()" to tell the VFS dcache | |
756 | * that the file no longer exists. However, doing that means that the | |
757 | * VFS layer can turn the dentry into a negative dentry. We don't want | |
f50b6f86 | 758 | * this, because the unlink is probably the result of an expire. |
5f6f4f28 IK |
759 | * We simply d_drop it and add it to a expiring list in the super block, |
760 | * which allows the dentry lookup to check for an incomplete expire. | |
1da177e4 LT |
761 | * |
762 | * If a process is blocked on the dentry waiting for the expire to finish, | |
763 | * it will invalidate the dentry and try to mount with a new one. | |
764 | * | |
765 | * Also see autofs4_dir_rmdir().. | |
766 | */ | |
767 | static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry) | |
768 | { | |
769 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); | |
770 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
1aff3c8b | 771 | struct autofs_info *p_ino; |
1da177e4 LT |
772 | |
773 | /* This allows root to remove symlinks */ | |
d78e53c8 | 774 | if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN)) |
1da177e4 LT |
775 | return -EACCES; |
776 | ||
1aff3c8b IK |
777 | if (atomic_dec_and_test(&ino->count)) { |
778 | p_ino = autofs4_dentry_ino(dentry->d_parent); | |
779 | if (p_ino && dentry->d_parent != dentry) | |
780 | atomic_dec(&p_ino->count); | |
781 | } | |
1da177e4 LT |
782 | dput(ino->dentry); |
783 | ||
784 | dentry->d_inode->i_size = 0; | |
ce71ec36 | 785 | clear_nlink(dentry->d_inode); |
1da177e4 LT |
786 | |
787 | dir->i_mtime = CURRENT_TIME; | |
788 | ||
f50b6f86 | 789 | spin_lock(&dcache_lock); |
5f6f4f28 | 790 | spin_lock(&sbi->lookup_lock); |
25767378 IK |
791 | if (list_empty(&ino->expiring)) |
792 | list_add(&ino->expiring, &sbi->expiring_list); | |
5f6f4f28 | 793 | spin_unlock(&sbi->lookup_lock); |
f50b6f86 IK |
794 | spin_lock(&dentry->d_lock); |
795 | __d_drop(dentry); | |
796 | spin_unlock(&dentry->d_lock); | |
797 | spin_unlock(&dcache_lock); | |
1da177e4 LT |
798 | |
799 | return 0; | |
800 | } | |
801 | ||
802 | static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry) | |
803 | { | |
804 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); | |
805 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
1aff3c8b | 806 | struct autofs_info *p_ino; |
1da177e4 | 807 | |
f50b6f86 IK |
808 | DPRINTK("dentry %p, removing %.*s", |
809 | dentry, dentry->d_name.len, dentry->d_name.name); | |
810 | ||
1da177e4 LT |
811 | if (!autofs4_oz_mode(sbi)) |
812 | return -EACCES; | |
813 | ||
814 | spin_lock(&dcache_lock); | |
815 | if (!list_empty(&dentry->d_subdirs)) { | |
816 | spin_unlock(&dcache_lock); | |
817 | return -ENOTEMPTY; | |
818 | } | |
5f6f4f28 | 819 | spin_lock(&sbi->lookup_lock); |
25767378 IK |
820 | if (list_empty(&ino->expiring)) |
821 | list_add(&ino->expiring, &sbi->expiring_list); | |
5f6f4f28 | 822 | spin_unlock(&sbi->lookup_lock); |
1da177e4 LT |
823 | spin_lock(&dentry->d_lock); |
824 | __d_drop(dentry); | |
825 | spin_unlock(&dentry->d_lock); | |
826 | spin_unlock(&dcache_lock); | |
827 | ||
1aff3c8b IK |
828 | if (atomic_dec_and_test(&ino->count)) { |
829 | p_ino = autofs4_dentry_ino(dentry->d_parent); | |
830 | if (p_ino && dentry->d_parent != dentry) | |
831 | atomic_dec(&p_ino->count); | |
832 | } | |
1da177e4 | 833 | dput(ino->dentry); |
1da177e4 | 834 | dentry->d_inode->i_size = 0; |
ce71ec36 | 835 | clear_nlink(dentry->d_inode); |
1da177e4 LT |
836 | |
837 | if (dir->i_nlink) | |
9a53c3a7 | 838 | drop_nlink(dir); |
1da177e4 LT |
839 | |
840 | return 0; | |
841 | } | |
842 | ||
843 | static int autofs4_dir_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
844 | { | |
845 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); | |
846 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
1aff3c8b | 847 | struct autofs_info *p_ino; |
1da177e4 LT |
848 | struct inode *inode; |
849 | ||
d78e53c8 | 850 | if (!autofs4_oz_mode(sbi)) |
1da177e4 LT |
851 | return -EACCES; |
852 | ||
853 | DPRINTK("dentry %p, creating %.*s", | |
854 | dentry, dentry->d_name.len, dentry->d_name.name); | |
855 | ||
856 | ino = autofs4_init_ino(ino, sbi, S_IFDIR | 0555); | |
25767378 IK |
857 | if (!ino) |
858 | return -ENOMEM; | |
859 | ||
860 | spin_lock(&sbi->lookup_lock); | |
861 | if (!list_empty(&ino->active)) | |
862 | list_del_init(&ino->active); | |
863 | spin_unlock(&sbi->lookup_lock); | |
1da177e4 LT |
864 | |
865 | inode = autofs4_get_inode(dir->i_sb, ino); | |
25767378 IK |
866 | if (!inode) { |
867 | if (!dentry->d_fsdata) | |
868 | kfree(ino); | |
869 | return -ENOMEM; | |
870 | } | |
1864f7bd | 871 | d_add(dentry, inode); |
1da177e4 LT |
872 | |
873 | if (dir == dir->i_sb->s_root->d_inode) | |
874 | dentry->d_op = &autofs4_root_dentry_operations; | |
875 | else | |
876 | dentry->d_op = &autofs4_dentry_operations; | |
877 | ||
878 | dentry->d_fsdata = ino; | |
879 | ino->dentry = dget(dentry); | |
1aff3c8b IK |
880 | atomic_inc(&ino->count); |
881 | p_ino = autofs4_dentry_ino(dentry->d_parent); | |
882 | if (p_ino && dentry->d_parent != dentry) | |
883 | atomic_inc(&p_ino->count); | |
1da177e4 | 884 | ino->inode = inode; |
d8c76e6f | 885 | inc_nlink(dir); |
1da177e4 LT |
886 | dir->i_mtime = CURRENT_TIME; |
887 | ||
888 | return 0; | |
889 | } | |
890 | ||
891 | /* Get/set timeout ioctl() operation */ | |
892 | static inline int autofs4_get_set_timeout(struct autofs_sb_info *sbi, | |
893 | unsigned long __user *p) | |
894 | { | |
895 | int rv; | |
896 | unsigned long ntimeout; | |
897 | ||
d78e53c8 SB |
898 | if ((rv = get_user(ntimeout, p)) || |
899 | (rv = put_user(sbi->exp_timeout/HZ, p))) | |
1da177e4 LT |
900 | return rv; |
901 | ||
d78e53c8 | 902 | if (ntimeout > ULONG_MAX/HZ) |
1da177e4 LT |
903 | sbi->exp_timeout = 0; |
904 | else | |
905 | sbi->exp_timeout = ntimeout * HZ; | |
906 | ||
907 | return 0; | |
908 | } | |
909 | ||
910 | /* Return protocol version */ | |
911 | static inline int autofs4_get_protover(struct autofs_sb_info *sbi, int __user *p) | |
912 | { | |
913 | return put_user(sbi->version, p); | |
914 | } | |
915 | ||
916 | /* Return protocol sub version */ | |
917 | static inline int autofs4_get_protosubver(struct autofs_sb_info *sbi, int __user *p) | |
918 | { | |
919 | return put_user(sbi->sub_version, p); | |
920 | } | |
921 | ||
922 | /* | |
923 | * Tells the daemon whether we need to reghost or not. Also, clears | |
924 | * the reghost_needed flag. | |
925 | */ | |
926 | static inline int autofs4_ask_reghost(struct autofs_sb_info *sbi, int __user *p) | |
927 | { | |
928 | int status; | |
929 | ||
930 | DPRINTK("returning %d", sbi->needs_reghost); | |
931 | ||
932 | status = put_user(sbi->needs_reghost, p); | |
d78e53c8 | 933 | if (status) |
1da177e4 LT |
934 | return status; |
935 | ||
936 | sbi->needs_reghost = 0; | |
937 | return 0; | |
938 | } | |
939 | ||
940 | /* | |
941 | * Enable / Disable reghosting ioctl() operation | |
942 | */ | |
943 | static inline int autofs4_toggle_reghost(struct autofs_sb_info *sbi, int __user *p) | |
944 | { | |
945 | int status; | |
946 | int val; | |
947 | ||
948 | status = get_user(val, p); | |
949 | ||
950 | DPRINTK("reghost = %d", val); | |
951 | ||
952 | if (status) | |
953 | return status; | |
954 | ||
955 | /* turn on/off reghosting, with the val */ | |
956 | sbi->reghost_enabled = val; | |
957 | return 0; | |
958 | } | |
959 | ||
960 | /* | |
961 | * Tells the daemon whether it can umount the autofs mount. | |
962 | */ | |
963 | static inline int autofs4_ask_umount(struct vfsmount *mnt, int __user *p) | |
964 | { | |
965 | int status = 0; | |
966 | ||
e3474a8e | 967 | if (may_umount(mnt)) |
1da177e4 LT |
968 | status = 1; |
969 | ||
970 | DPRINTK("returning %d", status); | |
971 | ||
972 | status = put_user(status, p); | |
973 | ||
974 | return status; | |
975 | } | |
976 | ||
977 | /* Identify autofs4_dentries - this is so we can tell if there's | |
978 | an extra dentry refcount or not. We only hold a refcount on the | |
979 | dentry if its non-negative (ie, d_inode != NULL) | |
980 | */ | |
981 | int is_autofs4_dentry(struct dentry *dentry) | |
982 | { | |
983 | return dentry && dentry->d_inode && | |
984 | (dentry->d_op == &autofs4_root_dentry_operations || | |
985 | dentry->d_op == &autofs4_dentry_operations) && | |
986 | dentry->d_fsdata != NULL; | |
987 | } | |
988 | ||
989 | /* | |
990 | * ioctl()'s on the root directory is the chief method for the daemon to | |
991 | * generate kernel reactions | |
992 | */ | |
993 | static int autofs4_root_ioctl(struct inode *inode, struct file *filp, | |
994 | unsigned int cmd, unsigned long arg) | |
995 | { | |
996 | struct autofs_sb_info *sbi = autofs4_sbi(inode->i_sb); | |
997 | void __user *p = (void __user *)arg; | |
998 | ||
999 | DPRINTK("cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u", | |
a47afb0f | 1000 | cmd,arg,sbi,task_pgrp_nr(current)); |
1da177e4 | 1001 | |
d78e53c8 SB |
1002 | if (_IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) || |
1003 | _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT) | |
1da177e4 LT |
1004 | return -ENOTTY; |
1005 | ||
d78e53c8 | 1006 | if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN)) |
1da177e4 LT |
1007 | return -EPERM; |
1008 | ||
1009 | switch(cmd) { | |
1010 | case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */ | |
1011 | return autofs4_wait_release(sbi,(autofs_wqt_t)arg,0); | |
1012 | case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */ | |
1013 | return autofs4_wait_release(sbi,(autofs_wqt_t)arg,-ENOENT); | |
1014 | case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */ | |
1015 | autofs4_catatonic_mode(sbi); | |
1016 | return 0; | |
1017 | case AUTOFS_IOC_PROTOVER: /* Get protocol version */ | |
1018 | return autofs4_get_protover(sbi, p); | |
1019 | case AUTOFS_IOC_PROTOSUBVER: /* Get protocol sub version */ | |
1020 | return autofs4_get_protosubver(sbi, p); | |
1021 | case AUTOFS_IOC_SETTIMEOUT: | |
1022 | return autofs4_get_set_timeout(sbi, p); | |
1023 | ||
1024 | case AUTOFS_IOC_TOGGLEREGHOST: | |
1025 | return autofs4_toggle_reghost(sbi, p); | |
1026 | case AUTOFS_IOC_ASKREGHOST: | |
1027 | return autofs4_ask_reghost(sbi, p); | |
1028 | ||
1029 | case AUTOFS_IOC_ASKUMOUNT: | |
a4669ed8 | 1030 | return autofs4_ask_umount(filp->f_path.mnt, p); |
1da177e4 LT |
1031 | |
1032 | /* return a single thing to expire */ | |
1033 | case AUTOFS_IOC_EXPIRE: | |
a4669ed8 | 1034 | return autofs4_expire_run(inode->i_sb,filp->f_path.mnt,sbi, p); |
1da177e4 LT |
1035 | /* same as above, but can send multiple expires through pipe */ |
1036 | case AUTOFS_IOC_EXPIRE_MULTI: | |
a4669ed8 | 1037 | return autofs4_expire_multi(inode->i_sb,filp->f_path.mnt,sbi, p); |
1da177e4 LT |
1038 | |
1039 | default: | |
1040 | return -ENOSYS; | |
1041 | } | |
1042 | } |