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> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1da177e4 LT |
19 | #include <linux/param.h> |
20 | #include <linux/time.h> | |
c9243f5b | 21 | #include <linux/compat.h> |
00e300e1 | 22 | #include <linux/mutex.h> |
c9243f5b | 23 | |
1da177e4 LT |
24 | #include "autofs_i.h" |
25 | ||
b5c84bf6 NP |
26 | DEFINE_SPINLOCK(autofs4_lock); |
27 | ||
1da177e4 LT |
28 | static int autofs4_dir_symlink(struct inode *,struct dentry *,const char *); |
29 | static int autofs4_dir_unlink(struct inode *,struct dentry *); | |
30 | static int autofs4_dir_rmdir(struct inode *,struct dentry *); | |
31 | static int autofs4_dir_mkdir(struct inode *,struct dentry *,int); | |
3663df70 | 32 | static long autofs4_root_ioctl(struct file *,unsigned int,unsigned long); |
5a44a73b | 33 | #ifdef CONFIG_COMPAT |
c9243f5b | 34 | static long autofs4_root_compat_ioctl(struct file *,unsigned int,unsigned long); |
5a44a73b | 35 | #endif |
1da177e4 | 36 | static int autofs4_dir_open(struct inode *inode, struct file *file); |
1da177e4 | 37 | static struct dentry *autofs4_lookup(struct inode *,struct dentry *, struct nameidata *); |
34ca959c | 38 | static void *autofs4_follow_link(struct dentry *, struct nameidata *); |
1da177e4 | 39 | |
6d5cb926 IK |
40 | #define TRIGGER_FLAGS (LOOKUP_CONTINUE | LOOKUP_DIRECTORY) |
41 | #define TRIGGER_INTENTS (LOOKUP_OPEN | LOOKUP_CREATE) | |
42 | ||
4b6f5d20 | 43 | const struct file_operations autofs4_root_operations = { |
1da177e4 LT |
44 | .open = dcache_dir_open, |
45 | .release = dcache_dir_close, | |
46 | .read = generic_read_dir, | |
aa55ddf3 | 47 | .readdir = dcache_readdir, |
59af1584 | 48 | .llseek = dcache_dir_lseek, |
3663df70 | 49 | .unlocked_ioctl = autofs4_root_ioctl, |
c9243f5b AB |
50 | #ifdef CONFIG_COMPAT |
51 | .compat_ioctl = autofs4_root_compat_ioctl, | |
52 | #endif | |
1da177e4 LT |
53 | }; |
54 | ||
4b6f5d20 | 55 | const struct file_operations autofs4_dir_operations = { |
1da177e4 | 56 | .open = autofs4_dir_open, |
ff9cd499 | 57 | .release = dcache_dir_close, |
1da177e4 | 58 | .read = generic_read_dir, |
ff9cd499 | 59 | .readdir = dcache_readdir, |
59af1584 | 60 | .llseek = dcache_dir_lseek, |
1da177e4 LT |
61 | }; |
62 | ||
754661f1 | 63 | const struct inode_operations autofs4_indirect_root_inode_operations = { |
1da177e4 LT |
64 | .lookup = autofs4_lookup, |
65 | .unlink = autofs4_dir_unlink, | |
66 | .symlink = autofs4_dir_symlink, | |
67 | .mkdir = autofs4_dir_mkdir, | |
68 | .rmdir = autofs4_dir_rmdir, | |
69 | }; | |
70 | ||
754661f1 | 71 | const struct inode_operations autofs4_direct_root_inode_operations = { |
34ca959c | 72 | .lookup = autofs4_lookup, |
871f9434 IK |
73 | .unlink = autofs4_dir_unlink, |
74 | .mkdir = autofs4_dir_mkdir, | |
75 | .rmdir = autofs4_dir_rmdir, | |
34ca959c IK |
76 | .follow_link = autofs4_follow_link, |
77 | }; | |
78 | ||
754661f1 | 79 | const struct inode_operations autofs4_dir_inode_operations = { |
1da177e4 LT |
80 | .lookup = autofs4_lookup, |
81 | .unlink = autofs4_dir_unlink, | |
82 | .symlink = autofs4_dir_symlink, | |
83 | .mkdir = autofs4_dir_mkdir, | |
84 | .rmdir = autofs4_dir_rmdir, | |
85 | }; | |
86 | ||
4f8427d1 IK |
87 | static void autofs4_add_active(struct dentry *dentry) |
88 | { | |
89 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
90 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
91 | if (ino) { | |
92 | spin_lock(&sbi->lookup_lock); | |
93 | if (!ino->active_count) { | |
94 | if (list_empty(&ino->active)) | |
95 | list_add(&ino->active, &sbi->active_list); | |
96 | } | |
97 | ino->active_count++; | |
98 | spin_unlock(&sbi->lookup_lock); | |
99 | } | |
100 | return; | |
101 | } | |
102 | ||
103 | static void autofs4_del_active(struct dentry *dentry) | |
104 | { | |
105 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
106 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
107 | if (ino) { | |
108 | spin_lock(&sbi->lookup_lock); | |
109 | ino->active_count--; | |
110 | if (!ino->active_count) { | |
111 | if (!list_empty(&ino->active)) | |
112 | list_del_init(&ino->active); | |
113 | } | |
114 | spin_unlock(&sbi->lookup_lock); | |
115 | } | |
116 | return; | |
117 | } | |
118 | ||
36b6413e IK |
119 | static unsigned int autofs4_need_mount(unsigned int flags) |
120 | { | |
121 | unsigned int res = 0; | |
122 | if (flags & (TRIGGER_FLAGS | TRIGGER_INTENTS)) | |
123 | res = 1; | |
124 | return res; | |
125 | } | |
126 | ||
1da177e4 LT |
127 | static int autofs4_dir_open(struct inode *inode, struct file *file) |
128 | { | |
a4669ed8 | 129 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 | 130 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
f360ce3b | 131 | |
1da177e4 LT |
132 | DPRINTK("file=%p dentry=%p %.*s", |
133 | file, dentry, dentry->d_name.len, dentry->d_name.name); | |
134 | ||
135 | if (autofs4_oz_mode(sbi)) | |
136 | goto out; | |
137 | ||
ff9cd499 IK |
138 | /* |
139 | * An empty directory in an autofs file system is always a | |
140 | * mount point. The daemon must have failed to mount this | |
141 | * during lookup so it doesn't exist. This can happen, for | |
142 | * example, if user space returns an incorrect status for a | |
143 | * mount request. Otherwise we're doing a readdir on the | |
144 | * autofs file system so just let the libfs routines handle | |
145 | * it. | |
146 | */ | |
b5c84bf6 | 147 | spin_lock(&autofs4_lock); |
2fd6b7f5 | 148 | spin_lock(&dentry->d_lock); |
c42c7f7e | 149 | if (!d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) { |
2fd6b7f5 | 150 | spin_unlock(&dentry->d_lock); |
b5c84bf6 | 151 | spin_unlock(&autofs4_lock); |
ff9cd499 | 152 | return -ENOENT; |
1da177e4 | 153 | } |
2fd6b7f5 | 154 | spin_unlock(&dentry->d_lock); |
b5c84bf6 | 155 | spin_unlock(&autofs4_lock); |
1da177e4 | 156 | |
1da177e4 | 157 | out: |
ff9cd499 | 158 | return dcache_dir_open(inode, file); |
1da177e4 LT |
159 | } |
160 | ||
4b1ae27a | 161 | static int try_to_fill_dentry(struct dentry *dentry, int flags) |
1da177e4 | 162 | { |
862b110f | 163 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
718c604a | 164 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
9d2de6ad | 165 | int status; |
1da177e4 | 166 | |
1da177e4 LT |
167 | DPRINTK("dentry=%p %.*s ino=%p", |
168 | dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
169 | ||
718c604a IK |
170 | /* |
171 | * Wait for a pending mount, triggering one if there | |
172 | * isn't one already | |
173 | */ | |
4b1ae27a AV |
174 | if (dentry->d_inode == NULL) { |
175 | DPRINTK("waiting for mount name=%.*s", | |
176 | dentry->d_name.len, dentry->d_name.name); | |
1da177e4 | 177 | |
4b1ae27a | 178 | status = autofs4_wait(sbi, dentry, NFY_MOUNT); |
718c604a | 179 | |
4b1ae27a | 180 | DPRINTK("mount done status=%d", status); |
1da177e4 | 181 | |
4b1ae27a AV |
182 | /* Turn this into a real negative dentry? */ |
183 | if (status == -ENOENT) { | |
184 | spin_lock(&sbi->fs_lock); | |
185 | ino->flags &= ~AUTOFS_INF_PENDING; | |
186 | spin_unlock(&sbi->fs_lock); | |
187 | return status; | |
188 | } else if (status) { | |
189 | /* Return a negative dentry, but leave it "pending" */ | |
190 | return status; | |
191 | } | |
192 | /* Trigger mount for path component or follow link */ | |
193 | } else if (ino->flags & AUTOFS_INF_PENDING || | |
f7422464 | 194 | autofs4_need_mount(flags)) { |
4b1ae27a AV |
195 | DPRINTK("waiting for mount name=%.*s", |
196 | dentry->d_name.len, dentry->d_name.name); | |
1da177e4 | 197 | |
4b1ae27a AV |
198 | spin_lock(&sbi->fs_lock); |
199 | ino->flags |= AUTOFS_INF_PENDING; | |
200 | spin_unlock(&sbi->fs_lock); | |
201 | status = autofs4_wait(sbi, dentry, NFY_MOUNT); | |
202 | ||
203 | DPRINTK("mount done status=%d", status); | |
204 | ||
205 | if (status) { | |
206 | spin_lock(&sbi->fs_lock); | |
207 | ino->flags &= ~AUTOFS_INF_PENDING; | |
208 | spin_unlock(&sbi->fs_lock); | |
209 | return status; | |
210 | } | |
211 | } | |
212 | ||
213 | /* Initialize expiry counter after successful mount */ | |
5fc79d85 | 214 | ino->last_used = jiffies; |
4b1ae27a AV |
215 | |
216 | spin_lock(&sbi->fs_lock); | |
217 | ino->flags &= ~AUTOFS_INF_PENDING; | |
218 | spin_unlock(&sbi->fs_lock); | |
219 | ||
220 | return 0; | |
34ca959c IK |
221 | } |
222 | ||
223 | /* For autofs direct mounts the follow link triggers the mount */ | |
224 | static void *autofs4_follow_link(struct dentry *dentry, struct nameidata *nd) | |
225 | { | |
226 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
a5370553 | 227 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
34ca959c IK |
228 | int oz_mode = autofs4_oz_mode(sbi); |
229 | unsigned int lookup_type; | |
230 | int status; | |
231 | ||
232 | DPRINTK("dentry=%p %.*s oz_mode=%d nd->flags=%d", | |
233 | dentry, dentry->d_name.len, dentry->d_name.name, oz_mode, | |
234 | nd->flags); | |
6e60a9ab IK |
235 | /* |
236 | * For an expire of a covered direct or offset mount we need | |
cc53ce53 | 237 | * to break out of follow_down_one() at the autofs mount trigger |
6e60a9ab IK |
238 | * (d_mounted--), so we can see the expiring flag, and manage |
239 | * the blocking and following here until the expire is completed. | |
240 | */ | |
241 | if (oz_mode) { | |
242 | spin_lock(&sbi->fs_lock); | |
243 | if (ino->flags & AUTOFS_INF_EXPIRING) { | |
244 | spin_unlock(&sbi->fs_lock); | |
245 | /* Follow down to our covering mount. */ | |
cc53ce53 | 246 | if (!follow_down_one(&nd->path)) |
6e60a9ab | 247 | goto done; |
ec6e8c7d | 248 | goto follow; |
6e60a9ab IK |
249 | } |
250 | spin_unlock(&sbi->fs_lock); | |
34ca959c | 251 | goto done; |
6e60a9ab | 252 | } |
34ca959c | 253 | |
6e60a9ab | 254 | /* If an expire request is pending everyone must wait. */ |
06a35985 | 255 | autofs4_expire_wait(dentry); |
871f9434 | 256 | |
6e60a9ab | 257 | /* We trigger a mount for almost all flags */ |
36b6413e | 258 | lookup_type = autofs4_need_mount(nd->flags); |
aa952eb2 | 259 | spin_lock(&sbi->fs_lock); |
b5c84bf6 | 260 | spin_lock(&autofs4_lock); |
2fd6b7f5 | 261 | spin_lock(&dentry->d_lock); |
aa952eb2 | 262 | if (!(lookup_type || ino->flags & AUTOFS_INF_PENDING)) { |
2fd6b7f5 | 263 | spin_unlock(&dentry->d_lock); |
b5c84bf6 | 264 | spin_unlock(&autofs4_lock); |
aa952eb2 | 265 | spin_unlock(&sbi->fs_lock); |
ec6e8c7d | 266 | goto follow; |
aa952eb2 | 267 | } |
6e60a9ab | 268 | |
871f9434 | 269 | /* |
6e60a9ab IK |
270 | * If the dentry contains directories then it is an autofs |
271 | * multi-mount with no root mount offset. So don't try to | |
272 | * mount it again. | |
871f9434 | 273 | */ |
aa952eb2 | 274 | if (ino->flags & AUTOFS_INF_PENDING || |
c42c7f7e | 275 | (!d_mountpoint(dentry) && list_empty(&dentry->d_subdirs))) { |
2fd6b7f5 | 276 | spin_unlock(&dentry->d_lock); |
b5c84bf6 | 277 | spin_unlock(&autofs4_lock); |
aa952eb2 | 278 | spin_unlock(&sbi->fs_lock); |
871f9434 | 279 | |
f7422464 | 280 | status = try_to_fill_dentry(dentry, nd->flags); |
871f9434 IK |
281 | if (status) |
282 | goto out_error; | |
283 | ||
6e60a9ab | 284 | goto follow; |
34ca959c | 285 | } |
2fd6b7f5 | 286 | spin_unlock(&dentry->d_lock); |
b5c84bf6 | 287 | spin_unlock(&autofs4_lock); |
aa952eb2 | 288 | spin_unlock(&sbi->fs_lock); |
6e60a9ab IK |
289 | follow: |
290 | /* | |
291 | * If there is no root mount it must be an autofs | |
292 | * multi-mount with no root offset so we don't need | |
293 | * to follow it. | |
294 | */ | |
cc53ce53 DH |
295 | if (d_managed(dentry)) { |
296 | status = follow_down(&nd->path, false); | |
297 | if (status < 0) | |
6e60a9ab | 298 | goto out_error; |
6e60a9ab | 299 | } |
34ca959c IK |
300 | |
301 | done: | |
302 | return NULL; | |
303 | ||
304 | out_error: | |
1d957f9b | 305 | path_put(&nd->path); |
34ca959c | 306 | return ERR_PTR(status); |
1da177e4 LT |
307 | } |
308 | ||
309 | /* | |
310 | * Revalidate is called on every cache lookup. Some of those | |
311 | * cache lookups may actually happen while the dentry is not | |
312 | * yet completely filled in, and revalidate has to delay such | |
313 | * lookups.. | |
314 | */ | |
718c604a | 315 | static int autofs4_revalidate(struct dentry *dentry, struct nameidata *nd) |
1da177e4 | 316 | { |
34286d66 NP |
317 | struct inode *dir; |
318 | struct autofs_sb_info *sbi; | |
319 | int oz_mode; | |
1da177e4 | 320 | int flags = nd ? nd->flags : 0; |
4b1ae27a | 321 | int status = 1; |
1da177e4 | 322 | |
34286d66 NP |
323 | if (flags & LOOKUP_RCU) |
324 | return -ECHILD; | |
325 | ||
326 | dir = dentry->d_parent->d_inode; | |
327 | sbi = autofs4_sbi(dir->i_sb); | |
328 | oz_mode = autofs4_oz_mode(sbi); | |
329 | ||
213614d5 | 330 | /* Pending dentry */ |
4b1ae27a | 331 | spin_lock(&sbi->fs_lock); |
1da177e4 | 332 | if (autofs4_ispending(dentry)) { |
4b1ae27a | 333 | /* The daemon never causes a mount to trigger */ |
213614d5 | 334 | spin_unlock(&sbi->fs_lock); |
4b1ae27a AV |
335 | |
336 | if (oz_mode) | |
337 | return 1; | |
bcdc5e01 | 338 | |
06a35985 IK |
339 | /* |
340 | * If the directory has gone away due to an expire | |
341 | * we have been called as ->d_revalidate() and so | |
342 | * we need to return false and proceed to ->lookup(). | |
343 | */ | |
344 | if (autofs4_expire_wait(dentry) == -EAGAIN) | |
345 | return 0; | |
346 | ||
bcdc5e01 IK |
347 | /* |
348 | * A zero status is success otherwise we have a | |
349 | * negative error code. | |
350 | */ | |
4b1ae27a | 351 | status = try_to_fill_dentry(dentry, flags); |
bcdc5e01 | 352 | if (status == 0) |
f50b6f86 IK |
353 | return 1; |
354 | ||
bcdc5e01 | 355 | return status; |
1da177e4 | 356 | } |
4b1ae27a AV |
357 | spin_unlock(&sbi->fs_lock); |
358 | ||
359 | /* Negative dentry.. invalidate if "old" */ | |
360 | if (dentry->d_inode == NULL) | |
361 | return 0; | |
1da177e4 LT |
362 | |
363 | /* Check for a non-mountpoint directory with no contents */ | |
b5c84bf6 | 364 | spin_lock(&autofs4_lock); |
2fd6b7f5 | 365 | spin_lock(&dentry->d_lock); |
1da177e4 | 366 | if (S_ISDIR(dentry->d_inode->i_mode) && |
c42c7f7e | 367 | !d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) { |
1da177e4 LT |
368 | DPRINTK("dentry=%p %.*s, emptydir", |
369 | dentry, dentry->d_name.len, dentry->d_name.name); | |
2fd6b7f5 | 370 | spin_unlock(&dentry->d_lock); |
b5c84bf6 | 371 | spin_unlock(&autofs4_lock); |
97e7449a | 372 | |
4b1ae27a AV |
373 | /* The daemon never causes a mount to trigger */ |
374 | if (oz_mode) | |
375 | return 1; | |
213614d5 | 376 | |
4b1ae27a AV |
377 | /* |
378 | * A zero status is success otherwise we have a | |
379 | * negative error code. | |
380 | */ | |
381 | status = try_to_fill_dentry(dentry, flags); | |
382 | if (status == 0) | |
383 | return 1; | |
213614d5 | 384 | |
4b1ae27a | 385 | return status; |
1da177e4 | 386 | } |
2fd6b7f5 | 387 | spin_unlock(&dentry->d_lock); |
b5c84bf6 | 388 | spin_unlock(&autofs4_lock); |
1da177e4 | 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 */ | |
08f11513 | 422 | static const struct dentry_operations autofs4_root_dentry_operations = { |
1da177e4 LT |
423 | .d_revalidate = autofs4_revalidate, |
424 | .d_release = autofs4_dentry_release, | |
425 | }; | |
426 | ||
427 | /* For other dentries */ | |
08f11513 | 428 | static const struct dentry_operations autofs4_dentry_operations = { |
1da177e4 LT |
429 | .d_revalidate = autofs4_revalidate, |
430 | .d_release = autofs4_dentry_release, | |
431 | }; | |
432 | ||
6510c9d8 | 433 | static struct dentry *autofs4_lookup_active(struct dentry *dentry) |
25767378 | 434 | { |
6510c9d8 IK |
435 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
436 | struct dentry *parent = dentry->d_parent; | |
437 | struct qstr *name = &dentry->d_name; | |
25767378 IK |
438 | unsigned int len = name->len; |
439 | unsigned int hash = name->hash; | |
440 | const unsigned char *str = name->name; | |
441 | struct list_head *p, *head; | |
442 | ||
b5c84bf6 | 443 | spin_lock(&autofs4_lock); |
25767378 IK |
444 | spin_lock(&sbi->lookup_lock); |
445 | head = &sbi->active_list; | |
446 | list_for_each(p, head) { | |
447 | struct autofs_info *ino; | |
e4d5ade7 | 448 | struct dentry *active; |
25767378 IK |
449 | struct qstr *qstr; |
450 | ||
451 | ino = list_entry(p, struct autofs_info, active); | |
e4d5ade7 | 452 | active = ino->dentry; |
25767378 | 453 | |
e4d5ade7 | 454 | spin_lock(&active->d_lock); |
25767378 IK |
455 | |
456 | /* Already gone? */ | |
b7ab39f6 | 457 | if (active->d_count == 0) |
25767378 IK |
458 | goto next; |
459 | ||
e4d5ade7 | 460 | qstr = &active->d_name; |
25767378 | 461 | |
e4d5ade7 | 462 | if (active->d_name.hash != hash) |
25767378 | 463 | goto next; |
e4d5ade7 | 464 | if (active->d_parent != parent) |
25767378 IK |
465 | goto next; |
466 | ||
467 | if (qstr->len != len) | |
468 | goto next; | |
469 | if (memcmp(qstr->name, str, len)) | |
470 | goto next; | |
471 | ||
4b1ae27a | 472 | if (d_unhashed(active)) { |
b7ab39f6 | 473 | dget_dlock(active); |
4b1ae27a AV |
474 | spin_unlock(&active->d_lock); |
475 | spin_unlock(&sbi->lookup_lock); | |
b5c84bf6 | 476 | spin_unlock(&autofs4_lock); |
4b1ae27a AV |
477 | return active; |
478 | } | |
25767378 | 479 | next: |
e4d5ade7 | 480 | spin_unlock(&active->d_lock); |
25767378 IK |
481 | } |
482 | spin_unlock(&sbi->lookup_lock); | |
b5c84bf6 | 483 | spin_unlock(&autofs4_lock); |
25767378 IK |
484 | |
485 | return NULL; | |
486 | } | |
487 | ||
6510c9d8 | 488 | static struct dentry *autofs4_lookup_expiring(struct dentry *dentry) |
f50b6f86 | 489 | { |
6510c9d8 IK |
490 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
491 | struct dentry *parent = dentry->d_parent; | |
492 | struct qstr *name = &dentry->d_name; | |
f50b6f86 IK |
493 | unsigned int len = name->len; |
494 | unsigned int hash = name->hash; | |
495 | const unsigned char *str = name->name; | |
496 | struct list_head *p, *head; | |
497 | ||
b5c84bf6 | 498 | spin_lock(&autofs4_lock); |
5f6f4f28 IK |
499 | spin_lock(&sbi->lookup_lock); |
500 | head = &sbi->expiring_list; | |
f50b6f86 IK |
501 | list_for_each(p, head) { |
502 | struct autofs_info *ino; | |
cb4b492a | 503 | struct dentry *expiring; |
f50b6f86 IK |
504 | struct qstr *qstr; |
505 | ||
5f6f4f28 | 506 | ino = list_entry(p, struct autofs_info, expiring); |
cb4b492a | 507 | expiring = ino->dentry; |
f50b6f86 | 508 | |
cb4b492a | 509 | spin_lock(&expiring->d_lock); |
f50b6f86 IK |
510 | |
511 | /* Bad luck, we've already been dentry_iput */ | |
cb4b492a | 512 | if (!expiring->d_inode) |
f50b6f86 IK |
513 | goto next; |
514 | ||
cb4b492a | 515 | qstr = &expiring->d_name; |
f50b6f86 | 516 | |
cb4b492a | 517 | if (expiring->d_name.hash != hash) |
f50b6f86 | 518 | goto next; |
cb4b492a | 519 | if (expiring->d_parent != parent) |
f50b6f86 IK |
520 | goto next; |
521 | ||
522 | if (qstr->len != len) | |
523 | goto next; | |
524 | if (memcmp(qstr->name, str, len)) | |
525 | goto next; | |
526 | ||
4b1ae27a | 527 | if (d_unhashed(expiring)) { |
b7ab39f6 | 528 | dget_dlock(expiring); |
4b1ae27a AV |
529 | spin_unlock(&expiring->d_lock); |
530 | spin_unlock(&sbi->lookup_lock); | |
b5c84bf6 | 531 | spin_unlock(&autofs4_lock); |
4b1ae27a AV |
532 | return expiring; |
533 | } | |
f50b6f86 | 534 | next: |
cb4b492a | 535 | spin_unlock(&expiring->d_lock); |
f50b6f86 | 536 | } |
5f6f4f28 | 537 | spin_unlock(&sbi->lookup_lock); |
b5c84bf6 | 538 | spin_unlock(&autofs4_lock); |
f50b6f86 IK |
539 | |
540 | return NULL; | |
541 | } | |
542 | ||
1da177e4 LT |
543 | /* Lookups in the root directory */ |
544 | static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) | |
545 | { | |
546 | struct autofs_sb_info *sbi; | |
25767378 | 547 | struct autofs_info *ino; |
90387c9c | 548 | struct dentry *expiring, *active; |
1da177e4 LT |
549 | int oz_mode; |
550 | ||
551 | DPRINTK("name = %.*s", | |
552 | dentry->d_name.len, dentry->d_name.name); | |
553 | ||
718c604a | 554 | /* File name too long to exist */ |
1da177e4 | 555 | if (dentry->d_name.len > NAME_MAX) |
718c604a | 556 | return ERR_PTR(-ENAMETOOLONG); |
1da177e4 LT |
557 | |
558 | sbi = autofs4_sbi(dir->i_sb); | |
1da177e4 | 559 | oz_mode = autofs4_oz_mode(sbi); |
718c604a | 560 | |
1da177e4 | 561 | DPRINTK("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d", |
a47afb0f | 562 | current->pid, task_pgrp_nr(current), sbi->catatonic, oz_mode); |
1da177e4 | 563 | |
6510c9d8 | 564 | active = autofs4_lookup_active(dentry); |
90387c9c IK |
565 | if (active) { |
566 | dentry = active; | |
aa952eb2 IK |
567 | ino = autofs4_dentry_ino(dentry); |
568 | } else { | |
4b1ae27a AV |
569 | /* |
570 | * Mark the dentry incomplete but don't hash it. We do this | |
571 | * to serialize our inode creation operations (symlink and | |
572 | * mkdir) which prevents deadlock during the callback to | |
573 | * the daemon. Subsequent user space lookups for the same | |
574 | * dentry are placed on the wait queue while the daemon | |
575 | * itself is allowed passage unresticted so the create | |
576 | * operation itself can then hash the dentry. Finally, | |
577 | * we check for the hashed dentry and return the newly | |
578 | * hashed dentry. | |
579 | */ | |
fb045adb | 580 | d_set_d_op(dentry, &autofs4_root_dentry_operations); |
4b1ae27a AV |
581 | |
582 | /* | |
583 | * And we need to ensure that the same dentry is used for | |
584 | * all following lookup calls until it is hashed so that | |
585 | * the dentry flags are persistent throughout the request. | |
586 | */ | |
587 | ino = autofs4_init_ino(NULL, sbi, 0555); | |
588 | if (!ino) | |
589 | return ERR_PTR(-ENOMEM); | |
590 | ||
591 | dentry->d_fsdata = ino; | |
592 | ino->dentry = dentry; | |
5f6f4f28 | 593 | |
4b1ae27a AV |
594 | autofs4_add_active(dentry); |
595 | ||
596 | d_instantiate(dentry, NULL); | |
597 | } | |
213614d5 | 598 | |
1da177e4 | 599 | if (!oz_mode) { |
213614d5 | 600 | mutex_unlock(&dir->i_mutex); |
4b1ae27a | 601 | expiring = autofs4_lookup_expiring(dentry); |
8f63aaa8 IK |
602 | if (expiring) { |
603 | /* | |
604 | * If we are racing with expire the request might not | |
605 | * be quite complete but the directory has been removed | |
606 | * so it must have been successful, so just wait for it. | |
607 | */ | |
8f63aaa8 | 608 | autofs4_expire_wait(expiring); |
4b1ae27a | 609 | autofs4_del_expiring(expiring); |
8f63aaa8 IK |
610 | dput(expiring); |
611 | } | |
4b1ae27a | 612 | |
aa952eb2 | 613 | spin_lock(&sbi->fs_lock); |
4b1ae27a | 614 | ino->flags |= AUTOFS_INF_PENDING; |
aa952eb2 | 615 | spin_unlock(&sbi->fs_lock); |
4b1ae27a AV |
616 | if (dentry->d_op && dentry->d_op->d_revalidate) |
617 | (dentry->d_op->d_revalidate)(dentry, nd); | |
618 | mutex_lock(&dir->i_mutex); | |
1da177e4 LT |
619 | } |
620 | ||
621 | /* | |
4b1ae27a | 622 | * If we are still pending, check if we had to handle |
1da177e4 LT |
623 | * a signal. If so we can force a restart.. |
624 | */ | |
4b1ae27a | 625 | if (ino->flags & AUTOFS_INF_PENDING) { |
1da177e4 LT |
626 | /* See if we were interrupted */ |
627 | if (signal_pending(current)) { | |
628 | sigset_t *sigset = ¤t->pending.signal; | |
629 | if (sigismember (sigset, SIGKILL) || | |
630 | sigismember (sigset, SIGQUIT) || | |
631 | sigismember (sigset, SIGINT)) { | |
90387c9c IK |
632 | if (active) |
633 | dput(active); | |
1da177e4 LT |
634 | return ERR_PTR(-ERESTARTNOINTR); |
635 | } | |
636 | } | |
4b1ae27a AV |
637 | if (!oz_mode) { |
638 | spin_lock(&sbi->fs_lock); | |
639 | ino->flags &= ~AUTOFS_INF_PENDING; | |
640 | spin_unlock(&sbi->fs_lock); | |
213614d5 IK |
641 | } |
642 | } | |
c9ffec48 | 643 | |
213614d5 | 644 | /* |
4b1ae27a AV |
645 | * If this dentry is unhashed, then we shouldn't honour this |
646 | * lookup. Returning ENOENT here doesn't do the right thing | |
647 | * for all system calls, but it should be OK for the operations | |
648 | * we permit from an autofs. | |
213614d5 | 649 | */ |
4b1ae27a | 650 | if (!oz_mode && d_unhashed(dentry)) { |
213614d5 | 651 | /* |
4b1ae27a AV |
652 | * A user space application can (and has done in the past) |
653 | * remove and re-create this directory during the callback. | |
654 | * This can leave us with an unhashed dentry, but a | |
655 | * successful mount! So we need to perform another | |
656 | * cached lookup in case the dentry now exists. | |
213614d5 | 657 | */ |
4b1ae27a AV |
658 | struct dentry *parent = dentry->d_parent; |
659 | struct dentry *new = d_lookup(parent, &dentry->d_name); | |
660 | if (new != NULL) | |
661 | dentry = new; | |
662 | else | |
663 | dentry = ERR_PTR(-ENOENT); | |
664 | ||
213614d5 | 665 | if (active) |
4b1ae27a AV |
666 | dput(active); |
667 | ||
668 | return dentry; | |
f50b6f86 IK |
669 | } |
670 | ||
4b1ae27a AV |
671 | if (active) |
672 | return active; | |
673 | ||
1da177e4 LT |
674 | return NULL; |
675 | } | |
676 | ||
677 | static int autofs4_dir_symlink(struct inode *dir, | |
678 | struct dentry *dentry, | |
679 | const char *symname) | |
680 | { | |
681 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); | |
682 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
1aff3c8b | 683 | struct autofs_info *p_ino; |
1da177e4 LT |
684 | struct inode *inode; |
685 | char *cp; | |
686 | ||
687 | DPRINTK("%s <- %.*s", symname, | |
688 | dentry->d_name.len, dentry->d_name.name); | |
689 | ||
690 | if (!autofs4_oz_mode(sbi)) | |
691 | return -EACCES; | |
692 | ||
693 | ino = autofs4_init_ino(ino, sbi, S_IFLNK | 0555); | |
25767378 IK |
694 | if (!ino) |
695 | return -ENOMEM; | |
1da177e4 | 696 | |
4b1ae27a AV |
697 | autofs4_del_active(dentry); |
698 | ||
ef581a74 | 699 | ino->size = strlen(symname); |
25767378 IK |
700 | cp = kmalloc(ino->size + 1, GFP_KERNEL); |
701 | if (!cp) { | |
702 | if (!dentry->d_fsdata) | |
703 | kfree(ino); | |
704 | return -ENOMEM; | |
1da177e4 LT |
705 | } |
706 | ||
707 | strcpy(cp, symname); | |
708 | ||
709 | inode = autofs4_get_inode(dir->i_sb, ino); | |
25767378 IK |
710 | if (!inode) { |
711 | kfree(cp); | |
712 | if (!dentry->d_fsdata) | |
713 | kfree(ino); | |
714 | return -ENOMEM; | |
715 | } | |
1864f7bd | 716 | d_add(dentry, inode); |
1da177e4 LT |
717 | |
718 | if (dir == dir->i_sb->s_root->d_inode) | |
fb045adb | 719 | d_set_d_op(dentry, &autofs4_root_dentry_operations); |
1da177e4 | 720 | else |
fb045adb | 721 | d_set_d_op(dentry, &autofs4_dentry_operations); |
1da177e4 LT |
722 | |
723 | dentry->d_fsdata = ino; | |
724 | ino->dentry = dget(dentry); | |
1aff3c8b IK |
725 | atomic_inc(&ino->count); |
726 | p_ino = autofs4_dentry_ino(dentry->d_parent); | |
727 | if (p_ino && dentry->d_parent != dentry) | |
728 | atomic_inc(&p_ino->count); | |
1da177e4 LT |
729 | ino->inode = inode; |
730 | ||
25767378 | 731 | ino->u.symlink = cp; |
1da177e4 LT |
732 | dir->i_mtime = CURRENT_TIME; |
733 | ||
734 | return 0; | |
735 | } | |
736 | ||
737 | /* | |
738 | * NOTE! | |
739 | * | |
740 | * Normal filesystems would do a "d_delete()" to tell the VFS dcache | |
741 | * that the file no longer exists. However, doing that means that the | |
742 | * VFS layer can turn the dentry into a negative dentry. We don't want | |
f50b6f86 | 743 | * this, because the unlink is probably the result of an expire. |
5f6f4f28 IK |
744 | * We simply d_drop it and add it to a expiring list in the super block, |
745 | * which allows the dentry lookup to check for an incomplete expire. | |
1da177e4 LT |
746 | * |
747 | * If a process is blocked on the dentry waiting for the expire to finish, | |
748 | * it will invalidate the dentry and try to mount with a new one. | |
749 | * | |
750 | * Also see autofs4_dir_rmdir().. | |
751 | */ | |
752 | static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry) | |
753 | { | |
754 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); | |
755 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
1aff3c8b | 756 | struct autofs_info *p_ino; |
1da177e4 LT |
757 | |
758 | /* This allows root to remove symlinks */ | |
d78e53c8 | 759 | if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN)) |
1da177e4 LT |
760 | return -EACCES; |
761 | ||
1aff3c8b IK |
762 | if (atomic_dec_and_test(&ino->count)) { |
763 | p_ino = autofs4_dentry_ino(dentry->d_parent); | |
764 | if (p_ino && dentry->d_parent != dentry) | |
765 | atomic_dec(&p_ino->count); | |
766 | } | |
1da177e4 LT |
767 | dput(ino->dentry); |
768 | ||
769 | dentry->d_inode->i_size = 0; | |
ce71ec36 | 770 | clear_nlink(dentry->d_inode); |
1da177e4 LT |
771 | |
772 | dir->i_mtime = CURRENT_TIME; | |
773 | ||
b5c84bf6 | 774 | spin_lock(&autofs4_lock); |
4b1ae27a | 775 | autofs4_add_expiring(dentry); |
f50b6f86 IK |
776 | spin_lock(&dentry->d_lock); |
777 | __d_drop(dentry); | |
778 | spin_unlock(&dentry->d_lock); | |
b5c84bf6 | 779 | spin_unlock(&autofs4_lock); |
1da177e4 LT |
780 | |
781 | return 0; | |
782 | } | |
783 | ||
784 | static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry) | |
785 | { | |
786 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); | |
787 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
1aff3c8b | 788 | struct autofs_info *p_ino; |
1da177e4 | 789 | |
f50b6f86 IK |
790 | DPRINTK("dentry %p, removing %.*s", |
791 | dentry, dentry->d_name.len, dentry->d_name.name); | |
792 | ||
1da177e4 LT |
793 | if (!autofs4_oz_mode(sbi)) |
794 | return -EACCES; | |
795 | ||
b5c84bf6 | 796 | spin_lock(&autofs4_lock); |
2fd6b7f5 NP |
797 | spin_lock(&sbi->lookup_lock); |
798 | spin_lock(&dentry->d_lock); | |
1da177e4 | 799 | if (!list_empty(&dentry->d_subdirs)) { |
2fd6b7f5 NP |
800 | spin_unlock(&dentry->d_lock); |
801 | spin_unlock(&sbi->lookup_lock); | |
b5c84bf6 | 802 | spin_unlock(&autofs4_lock); |
1da177e4 LT |
803 | return -ENOTEMPTY; |
804 | } | |
2fd6b7f5 NP |
805 | __autofs4_add_expiring(dentry); |
806 | spin_unlock(&sbi->lookup_lock); | |
1da177e4 LT |
807 | __d_drop(dentry); |
808 | spin_unlock(&dentry->d_lock); | |
b5c84bf6 | 809 | spin_unlock(&autofs4_lock); |
1da177e4 | 810 | |
1aff3c8b IK |
811 | if (atomic_dec_and_test(&ino->count)) { |
812 | p_ino = autofs4_dentry_ino(dentry->d_parent); | |
813 | if (p_ino && dentry->d_parent != dentry) | |
814 | atomic_dec(&p_ino->count); | |
815 | } | |
1da177e4 | 816 | dput(ino->dentry); |
1da177e4 | 817 | dentry->d_inode->i_size = 0; |
ce71ec36 | 818 | clear_nlink(dentry->d_inode); |
1da177e4 LT |
819 | |
820 | if (dir->i_nlink) | |
9a53c3a7 | 821 | drop_nlink(dir); |
1da177e4 LT |
822 | |
823 | return 0; | |
824 | } | |
825 | ||
826 | static int autofs4_dir_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
827 | { | |
828 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); | |
829 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
1aff3c8b | 830 | struct autofs_info *p_ino; |
1da177e4 LT |
831 | struct inode *inode; |
832 | ||
d78e53c8 | 833 | if (!autofs4_oz_mode(sbi)) |
1da177e4 LT |
834 | return -EACCES; |
835 | ||
836 | DPRINTK("dentry %p, creating %.*s", | |
837 | dentry, dentry->d_name.len, dentry->d_name.name); | |
838 | ||
839 | ino = autofs4_init_ino(ino, sbi, S_IFDIR | 0555); | |
25767378 IK |
840 | if (!ino) |
841 | return -ENOMEM; | |
842 | ||
4b1ae27a AV |
843 | autofs4_del_active(dentry); |
844 | ||
1da177e4 | 845 | inode = autofs4_get_inode(dir->i_sb, ino); |
25767378 IK |
846 | if (!inode) { |
847 | if (!dentry->d_fsdata) | |
848 | kfree(ino); | |
849 | return -ENOMEM; | |
850 | } | |
1864f7bd | 851 | d_add(dentry, inode); |
1da177e4 LT |
852 | |
853 | if (dir == dir->i_sb->s_root->d_inode) | |
fb045adb | 854 | d_set_d_op(dentry, &autofs4_root_dentry_operations); |
1da177e4 | 855 | else |
fb045adb | 856 | d_set_d_op(dentry, &autofs4_dentry_operations); |
1da177e4 LT |
857 | |
858 | dentry->d_fsdata = ino; | |
859 | ino->dentry = dget(dentry); | |
1aff3c8b IK |
860 | atomic_inc(&ino->count); |
861 | p_ino = autofs4_dentry_ino(dentry->d_parent); | |
862 | if (p_ino && dentry->d_parent != dentry) | |
863 | atomic_inc(&p_ino->count); | |
1da177e4 | 864 | ino->inode = inode; |
d8c76e6f | 865 | inc_nlink(dir); |
1da177e4 LT |
866 | dir->i_mtime = CURRENT_TIME; |
867 | ||
868 | return 0; | |
869 | } | |
870 | ||
871 | /* Get/set timeout ioctl() operation */ | |
c9243f5b AB |
872 | #ifdef CONFIG_COMPAT |
873 | static inline int autofs4_compat_get_set_timeout(struct autofs_sb_info *sbi, | |
874 | compat_ulong_t __user *p) | |
875 | { | |
876 | int rv; | |
877 | unsigned long ntimeout; | |
878 | ||
879 | if ((rv = get_user(ntimeout, p)) || | |
880 | (rv = put_user(sbi->exp_timeout/HZ, p))) | |
881 | return rv; | |
882 | ||
883 | if (ntimeout > UINT_MAX/HZ) | |
884 | sbi->exp_timeout = 0; | |
885 | else | |
886 | sbi->exp_timeout = ntimeout * HZ; | |
887 | ||
888 | return 0; | |
889 | } | |
890 | #endif | |
891 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
922 | /* |
923 | * Tells the daemon whether it can umount the autofs mount. | |
924 | */ | |
925 | static inline int autofs4_ask_umount(struct vfsmount *mnt, int __user *p) | |
926 | { | |
927 | int status = 0; | |
928 | ||
e3474a8e | 929 | if (may_umount(mnt)) |
1da177e4 LT |
930 | status = 1; |
931 | ||
932 | DPRINTK("returning %d", status); | |
933 | ||
934 | status = put_user(status, p); | |
935 | ||
936 | return status; | |
937 | } | |
938 | ||
939 | /* Identify autofs4_dentries - this is so we can tell if there's | |
940 | an extra dentry refcount or not. We only hold a refcount on the | |
941 | dentry if its non-negative (ie, d_inode != NULL) | |
942 | */ | |
943 | int is_autofs4_dentry(struct dentry *dentry) | |
944 | { | |
945 | return dentry && dentry->d_inode && | |
946 | (dentry->d_op == &autofs4_root_dentry_operations || | |
947 | dentry->d_op == &autofs4_dentry_operations) && | |
948 | dentry->d_fsdata != NULL; | |
949 | } | |
950 | ||
951 | /* | |
952 | * ioctl()'s on the root directory is the chief method for the daemon to | |
953 | * generate kernel reactions | |
954 | */ | |
3663df70 FW |
955 | static int autofs4_root_ioctl_unlocked(struct inode *inode, struct file *filp, |
956 | unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
957 | { |
958 | struct autofs_sb_info *sbi = autofs4_sbi(inode->i_sb); | |
959 | void __user *p = (void __user *)arg; | |
960 | ||
961 | DPRINTK("cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u", | |
a47afb0f | 962 | cmd,arg,sbi,task_pgrp_nr(current)); |
1da177e4 | 963 | |
d78e53c8 SB |
964 | if (_IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) || |
965 | _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT) | |
1da177e4 LT |
966 | return -ENOTTY; |
967 | ||
d78e53c8 | 968 | if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN)) |
1da177e4 LT |
969 | return -EPERM; |
970 | ||
971 | switch(cmd) { | |
972 | case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */ | |
973 | return autofs4_wait_release(sbi,(autofs_wqt_t)arg,0); | |
974 | case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */ | |
975 | return autofs4_wait_release(sbi,(autofs_wqt_t)arg,-ENOENT); | |
976 | case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */ | |
977 | autofs4_catatonic_mode(sbi); | |
978 | return 0; | |
979 | case AUTOFS_IOC_PROTOVER: /* Get protocol version */ | |
980 | return autofs4_get_protover(sbi, p); | |
981 | case AUTOFS_IOC_PROTOSUBVER: /* Get protocol sub version */ | |
982 | return autofs4_get_protosubver(sbi, p); | |
983 | case AUTOFS_IOC_SETTIMEOUT: | |
984 | return autofs4_get_set_timeout(sbi, p); | |
c9243f5b AB |
985 | #ifdef CONFIG_COMPAT |
986 | case AUTOFS_IOC_SETTIMEOUT32: | |
987 | return autofs4_compat_get_set_timeout(sbi, p); | |
988 | #endif | |
1da177e4 | 989 | |
1da177e4 | 990 | case AUTOFS_IOC_ASKUMOUNT: |
a4669ed8 | 991 | return autofs4_ask_umount(filp->f_path.mnt, p); |
1da177e4 LT |
992 | |
993 | /* return a single thing to expire */ | |
994 | case AUTOFS_IOC_EXPIRE: | |
a4669ed8 | 995 | return autofs4_expire_run(inode->i_sb,filp->f_path.mnt,sbi, p); |
1da177e4 LT |
996 | /* same as above, but can send multiple expires through pipe */ |
997 | case AUTOFS_IOC_EXPIRE_MULTI: | |
a4669ed8 | 998 | return autofs4_expire_multi(inode->i_sb,filp->f_path.mnt,sbi, p); |
1da177e4 LT |
999 | |
1000 | default: | |
1001 | return -ENOSYS; | |
1002 | } | |
1003 | } | |
3663df70 FW |
1004 | |
1005 | static long autofs4_root_ioctl(struct file *filp, | |
1006 | unsigned int cmd, unsigned long arg) | |
1007 | { | |
3663df70 | 1008 | struct inode *inode = filp->f_dentry->d_inode; |
de47de74 | 1009 | return autofs4_root_ioctl_unlocked(inode, filp, cmd, arg); |
3663df70 | 1010 | } |
c9243f5b AB |
1011 | |
1012 | #ifdef CONFIG_COMPAT | |
1013 | static long autofs4_root_compat_ioctl(struct file *filp, | |
1014 | unsigned int cmd, unsigned long arg) | |
1015 | { | |
1016 | struct inode *inode = filp->f_path.dentry->d_inode; | |
1017 | int ret; | |
1018 | ||
c9243f5b AB |
1019 | if (cmd == AUTOFS_IOC_READY || cmd == AUTOFS_IOC_FAIL) |
1020 | ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, arg); | |
1021 | else | |
1022 | ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, | |
1023 | (unsigned long)compat_ptr(arg)); | |
c9243f5b AB |
1024 | |
1025 | return ret; | |
1026 | } | |
1027 | #endif |