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Commit | Line | Data |
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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> |
3663df70 | 22 | #include <linux/smp_lock.h> |
c9243f5b | 23 | |
1da177e4 LT |
24 | #include "autofs_i.h" |
25 | ||
26 | static int autofs4_dir_symlink(struct inode *,struct dentry *,const char *); | |
27 | static int autofs4_dir_unlink(struct inode *,struct dentry *); | |
28 | static int autofs4_dir_rmdir(struct inode *,struct dentry *); | |
29 | static int autofs4_dir_mkdir(struct inode *,struct dentry *,int); | |
3663df70 | 30 | static long autofs4_root_ioctl(struct file *,unsigned int,unsigned long); |
c9243f5b | 31 | static long autofs4_root_compat_ioctl(struct file *,unsigned int,unsigned long); |
1da177e4 | 32 | static int autofs4_dir_open(struct inode *inode, struct file *file); |
1da177e4 | 33 | static struct dentry *autofs4_lookup(struct inode *,struct dentry *, struct nameidata *); |
34ca959c | 34 | static void *autofs4_follow_link(struct dentry *, struct nameidata *); |
1da177e4 | 35 | |
6d5cb926 IK |
36 | #define TRIGGER_FLAGS (LOOKUP_CONTINUE | LOOKUP_DIRECTORY) |
37 | #define TRIGGER_INTENTS (LOOKUP_OPEN | LOOKUP_CREATE) | |
38 | ||
4b6f5d20 | 39 | const struct file_operations autofs4_root_operations = { |
1da177e4 LT |
40 | .open = dcache_dir_open, |
41 | .release = dcache_dir_close, | |
42 | .read = generic_read_dir, | |
aa55ddf3 | 43 | .readdir = dcache_readdir, |
59af1584 | 44 | .llseek = dcache_dir_lseek, |
3663df70 | 45 | .unlocked_ioctl = autofs4_root_ioctl, |
c9243f5b AB |
46 | #ifdef CONFIG_COMPAT |
47 | .compat_ioctl = autofs4_root_compat_ioctl, | |
48 | #endif | |
1da177e4 LT |
49 | }; |
50 | ||
4b6f5d20 | 51 | const struct file_operations autofs4_dir_operations = { |
1da177e4 | 52 | .open = autofs4_dir_open, |
ff9cd499 | 53 | .release = dcache_dir_close, |
1da177e4 | 54 | .read = generic_read_dir, |
ff9cd499 | 55 | .readdir = dcache_readdir, |
59af1584 | 56 | .llseek = dcache_dir_lseek, |
1da177e4 LT |
57 | }; |
58 | ||
754661f1 | 59 | const struct inode_operations autofs4_indirect_root_inode_operations = { |
1da177e4 LT |
60 | .lookup = autofs4_lookup, |
61 | .unlink = autofs4_dir_unlink, | |
62 | .symlink = autofs4_dir_symlink, | |
63 | .mkdir = autofs4_dir_mkdir, | |
64 | .rmdir = autofs4_dir_rmdir, | |
65 | }; | |
66 | ||
754661f1 | 67 | const struct inode_operations autofs4_direct_root_inode_operations = { |
34ca959c | 68 | .lookup = autofs4_lookup, |
871f9434 IK |
69 | .unlink = autofs4_dir_unlink, |
70 | .mkdir = autofs4_dir_mkdir, | |
71 | .rmdir = autofs4_dir_rmdir, | |
34ca959c IK |
72 | .follow_link = autofs4_follow_link, |
73 | }; | |
74 | ||
754661f1 | 75 | const struct inode_operations autofs4_dir_inode_operations = { |
1da177e4 LT |
76 | .lookup = autofs4_lookup, |
77 | .unlink = autofs4_dir_unlink, | |
78 | .symlink = autofs4_dir_symlink, | |
79 | .mkdir = autofs4_dir_mkdir, | |
80 | .rmdir = autofs4_dir_rmdir, | |
81 | }; | |
82 | ||
4f8427d1 IK |
83 | static void autofs4_add_active(struct dentry *dentry) |
84 | { | |
85 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
86 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
87 | if (ino) { | |
88 | spin_lock(&sbi->lookup_lock); | |
89 | if (!ino->active_count) { | |
90 | if (list_empty(&ino->active)) | |
91 | list_add(&ino->active, &sbi->active_list); | |
92 | } | |
93 | ino->active_count++; | |
94 | spin_unlock(&sbi->lookup_lock); | |
95 | } | |
96 | return; | |
97 | } | |
98 | ||
99 | static void autofs4_del_active(struct dentry *dentry) | |
100 | { | |
101 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
102 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
103 | if (ino) { | |
104 | spin_lock(&sbi->lookup_lock); | |
105 | ino->active_count--; | |
106 | if (!ino->active_count) { | |
107 | if (!list_empty(&ino->active)) | |
108 | list_del_init(&ino->active); | |
109 | } | |
110 | spin_unlock(&sbi->lookup_lock); | |
111 | } | |
112 | return; | |
113 | } | |
114 | ||
36b6413e IK |
115 | static unsigned int autofs4_need_mount(unsigned int flags) |
116 | { | |
117 | unsigned int res = 0; | |
118 | if (flags & (TRIGGER_FLAGS | TRIGGER_INTENTS)) | |
119 | res = 1; | |
120 | return res; | |
121 | } | |
122 | ||
1da177e4 LT |
123 | static int autofs4_dir_open(struct inode *inode, struct file *file) |
124 | { | |
a4669ed8 | 125 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 | 126 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
f360ce3b | 127 | |
1da177e4 LT |
128 | DPRINTK("file=%p dentry=%p %.*s", |
129 | file, dentry, dentry->d_name.len, dentry->d_name.name); | |
130 | ||
131 | if (autofs4_oz_mode(sbi)) | |
132 | goto out; | |
133 | ||
ff9cd499 IK |
134 | /* |
135 | * An empty directory in an autofs file system is always a | |
136 | * mount point. The daemon must have failed to mount this | |
137 | * during lookup so it doesn't exist. This can happen, for | |
138 | * example, if user space returns an incorrect status for a | |
139 | * mount request. Otherwise we're doing a readdir on the | |
140 | * autofs file system so just let the libfs routines handle | |
141 | * it. | |
142 | */ | |
143 | spin_lock(&dcache_lock); | |
c42c7f7e | 144 | if (!d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) { |
1da177e4 | 145 | spin_unlock(&dcache_lock); |
ff9cd499 | 146 | return -ENOENT; |
1da177e4 | 147 | } |
ff9cd499 | 148 | spin_unlock(&dcache_lock); |
1da177e4 | 149 | |
1da177e4 | 150 | out: |
ff9cd499 | 151 | return dcache_dir_open(inode, file); |
1da177e4 LT |
152 | } |
153 | ||
4b1ae27a | 154 | static int try_to_fill_dentry(struct dentry *dentry, int flags) |
1da177e4 | 155 | { |
862b110f | 156 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
718c604a | 157 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
9d2de6ad | 158 | int status; |
1da177e4 | 159 | |
1da177e4 LT |
160 | DPRINTK("dentry=%p %.*s ino=%p", |
161 | dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
162 | ||
718c604a IK |
163 | /* |
164 | * Wait for a pending mount, triggering one if there | |
165 | * isn't one already | |
166 | */ | |
4b1ae27a AV |
167 | if (dentry->d_inode == NULL) { |
168 | DPRINTK("waiting for mount name=%.*s", | |
169 | dentry->d_name.len, dentry->d_name.name); | |
1da177e4 | 170 | |
4b1ae27a | 171 | status = autofs4_wait(sbi, dentry, NFY_MOUNT); |
718c604a | 172 | |
4b1ae27a | 173 | DPRINTK("mount done status=%d", status); |
1da177e4 | 174 | |
4b1ae27a AV |
175 | /* Turn this into a real negative dentry? */ |
176 | if (status == -ENOENT) { | |
177 | spin_lock(&sbi->fs_lock); | |
178 | ino->flags &= ~AUTOFS_INF_PENDING; | |
179 | spin_unlock(&sbi->fs_lock); | |
180 | return status; | |
181 | } else if (status) { | |
182 | /* Return a negative dentry, but leave it "pending" */ | |
183 | return status; | |
184 | } | |
185 | /* Trigger mount for path component or follow link */ | |
186 | } else if (ino->flags & AUTOFS_INF_PENDING || | |
f7422464 | 187 | autofs4_need_mount(flags)) { |
4b1ae27a AV |
188 | DPRINTK("waiting for mount name=%.*s", |
189 | dentry->d_name.len, dentry->d_name.name); | |
1da177e4 | 190 | |
4b1ae27a AV |
191 | spin_lock(&sbi->fs_lock); |
192 | ino->flags |= AUTOFS_INF_PENDING; | |
193 | spin_unlock(&sbi->fs_lock); | |
194 | status = autofs4_wait(sbi, dentry, NFY_MOUNT); | |
195 | ||
196 | DPRINTK("mount done status=%d", status); | |
197 | ||
198 | if (status) { | |
199 | spin_lock(&sbi->fs_lock); | |
200 | ino->flags &= ~AUTOFS_INF_PENDING; | |
201 | spin_unlock(&sbi->fs_lock); | |
202 | return status; | |
203 | } | |
204 | } | |
205 | ||
206 | /* Initialize expiry counter after successful mount */ | |
5fc79d85 | 207 | ino->last_used = jiffies; |
4b1ae27a AV |
208 | |
209 | spin_lock(&sbi->fs_lock); | |
210 | ino->flags &= ~AUTOFS_INF_PENDING; | |
211 | spin_unlock(&sbi->fs_lock); | |
212 | ||
213 | return 0; | |
34ca959c IK |
214 | } |
215 | ||
216 | /* For autofs direct mounts the follow link triggers the mount */ | |
217 | static void *autofs4_follow_link(struct dentry *dentry, struct nameidata *nd) | |
218 | { | |
219 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
a5370553 | 220 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
34ca959c IK |
221 | int oz_mode = autofs4_oz_mode(sbi); |
222 | unsigned int lookup_type; | |
223 | int status; | |
224 | ||
225 | DPRINTK("dentry=%p %.*s oz_mode=%d nd->flags=%d", | |
226 | dentry, dentry->d_name.len, dentry->d_name.name, oz_mode, | |
227 | nd->flags); | |
6e60a9ab IK |
228 | /* |
229 | * For an expire of a covered direct or offset mount we need | |
9393bd07 | 230 | * to break out of follow_down() at the autofs mount trigger |
6e60a9ab IK |
231 | * (d_mounted--), so we can see the expiring flag, and manage |
232 | * the blocking and following here until the expire is completed. | |
233 | */ | |
234 | if (oz_mode) { | |
235 | spin_lock(&sbi->fs_lock); | |
236 | if (ino->flags & AUTOFS_INF_EXPIRING) { | |
237 | spin_unlock(&sbi->fs_lock); | |
238 | /* Follow down to our covering mount. */ | |
9393bd07 | 239 | if (!follow_down(&nd->path)) |
6e60a9ab | 240 | goto done; |
ec6e8c7d | 241 | goto follow; |
6e60a9ab IK |
242 | } |
243 | spin_unlock(&sbi->fs_lock); | |
34ca959c | 244 | goto done; |
6e60a9ab | 245 | } |
34ca959c | 246 | |
6e60a9ab | 247 | /* If an expire request is pending everyone must wait. */ |
06a35985 | 248 | autofs4_expire_wait(dentry); |
871f9434 | 249 | |
6e60a9ab | 250 | /* We trigger a mount for almost all flags */ |
36b6413e | 251 | lookup_type = autofs4_need_mount(nd->flags); |
aa952eb2 IK |
252 | spin_lock(&sbi->fs_lock); |
253 | spin_lock(&dcache_lock); | |
254 | if (!(lookup_type || ino->flags & AUTOFS_INF_PENDING)) { | |
255 | spin_unlock(&dcache_lock); | |
256 | spin_unlock(&sbi->fs_lock); | |
ec6e8c7d | 257 | goto follow; |
aa952eb2 | 258 | } |
6e60a9ab | 259 | |
871f9434 | 260 | /* |
6e60a9ab IK |
261 | * If the dentry contains directories then it is an autofs |
262 | * multi-mount with no root mount offset. So don't try to | |
263 | * mount it again. | |
871f9434 | 264 | */ |
aa952eb2 | 265 | if (ino->flags & AUTOFS_INF_PENDING || |
c42c7f7e | 266 | (!d_mountpoint(dentry) && list_empty(&dentry->d_subdirs))) { |
871f9434 | 267 | spin_unlock(&dcache_lock); |
aa952eb2 | 268 | spin_unlock(&sbi->fs_lock); |
871f9434 | 269 | |
f7422464 | 270 | status = try_to_fill_dentry(dentry, nd->flags); |
871f9434 IK |
271 | if (status) |
272 | goto out_error; | |
273 | ||
6e60a9ab | 274 | goto follow; |
34ca959c | 275 | } |
871f9434 | 276 | spin_unlock(&dcache_lock); |
aa952eb2 | 277 | spin_unlock(&sbi->fs_lock); |
6e60a9ab IK |
278 | follow: |
279 | /* | |
280 | * If there is no root mount it must be an autofs | |
281 | * multi-mount with no root offset so we don't need | |
282 | * to follow it. | |
283 | */ | |
284 | if (d_mountpoint(dentry)) { | |
9393bd07 | 285 | if (!autofs4_follow_mount(&nd->path)) { |
6e60a9ab IK |
286 | status = -ENOENT; |
287 | goto out_error; | |
288 | } | |
289 | } | |
34ca959c IK |
290 | |
291 | done: | |
292 | return NULL; | |
293 | ||
294 | out_error: | |
1d957f9b | 295 | path_put(&nd->path); |
34ca959c | 296 | return ERR_PTR(status); |
1da177e4 LT |
297 | } |
298 | ||
299 | /* | |
300 | * Revalidate is called on every cache lookup. Some of those | |
301 | * cache lookups may actually happen while the dentry is not | |
302 | * yet completely filled in, and revalidate has to delay such | |
303 | * lookups.. | |
304 | */ | |
718c604a | 305 | static int autofs4_revalidate(struct dentry *dentry, struct nameidata *nd) |
1da177e4 | 306 | { |
718c604a | 307 | struct inode *dir = dentry->d_parent->d_inode; |
1da177e4 | 308 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); |
4b1ae27a | 309 | int oz_mode = autofs4_oz_mode(sbi); |
1da177e4 | 310 | int flags = nd ? nd->flags : 0; |
4b1ae27a | 311 | int status = 1; |
1da177e4 | 312 | |
213614d5 | 313 | /* Pending dentry */ |
4b1ae27a | 314 | spin_lock(&sbi->fs_lock); |
1da177e4 | 315 | if (autofs4_ispending(dentry)) { |
4b1ae27a | 316 | /* The daemon never causes a mount to trigger */ |
213614d5 | 317 | spin_unlock(&sbi->fs_lock); |
4b1ae27a AV |
318 | |
319 | if (oz_mode) | |
320 | return 1; | |
bcdc5e01 | 321 | |
06a35985 IK |
322 | /* |
323 | * If the directory has gone away due to an expire | |
324 | * we have been called as ->d_revalidate() and so | |
325 | * we need to return false and proceed to ->lookup(). | |
326 | */ | |
327 | if (autofs4_expire_wait(dentry) == -EAGAIN) | |
328 | return 0; | |
329 | ||
bcdc5e01 IK |
330 | /* |
331 | * A zero status is success otherwise we have a | |
332 | * negative error code. | |
333 | */ | |
4b1ae27a | 334 | status = try_to_fill_dentry(dentry, flags); |
bcdc5e01 | 335 | if (status == 0) |
f50b6f86 IK |
336 | return 1; |
337 | ||
bcdc5e01 | 338 | return status; |
1da177e4 | 339 | } |
4b1ae27a AV |
340 | spin_unlock(&sbi->fs_lock); |
341 | ||
342 | /* Negative dentry.. invalidate if "old" */ | |
343 | if (dentry->d_inode == NULL) | |
344 | return 0; | |
1da177e4 LT |
345 | |
346 | /* Check for a non-mountpoint directory with no contents */ | |
4b1ae27a | 347 | spin_lock(&dcache_lock); |
1da177e4 | 348 | if (S_ISDIR(dentry->d_inode->i_mode) && |
c42c7f7e | 349 | !d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) { |
1da177e4 LT |
350 | DPRINTK("dentry=%p %.*s, emptydir", |
351 | dentry, dentry->d_name.len, dentry->d_name.name); | |
4b1ae27a | 352 | spin_unlock(&dcache_lock); |
97e7449a | 353 | |
4b1ae27a AV |
354 | /* The daemon never causes a mount to trigger */ |
355 | if (oz_mode) | |
356 | return 1; | |
213614d5 | 357 | |
4b1ae27a AV |
358 | /* |
359 | * A zero status is success otherwise we have a | |
360 | * negative error code. | |
361 | */ | |
362 | status = try_to_fill_dentry(dentry, flags); | |
363 | if (status == 0) | |
364 | return 1; | |
213614d5 | 365 | |
4b1ae27a | 366 | return status; |
1da177e4 LT |
367 | } |
368 | spin_unlock(&dcache_lock); | |
369 | ||
1da177e4 LT |
370 | return 1; |
371 | } | |
372 | ||
34ca959c | 373 | void autofs4_dentry_release(struct dentry *de) |
1da177e4 LT |
374 | { |
375 | struct autofs_info *inf; | |
376 | ||
377 | DPRINTK("releasing %p", de); | |
378 | ||
379 | inf = autofs4_dentry_ino(de); | |
380 | de->d_fsdata = NULL; | |
381 | ||
382 | if (inf) { | |
f50b6f86 IK |
383 | struct autofs_sb_info *sbi = autofs4_sbi(de->d_sb); |
384 | ||
f50b6f86 | 385 | if (sbi) { |
5f6f4f28 | 386 | spin_lock(&sbi->lookup_lock); |
25767378 IK |
387 | if (!list_empty(&inf->active)) |
388 | list_del(&inf->active); | |
5f6f4f28 IK |
389 | if (!list_empty(&inf->expiring)) |
390 | list_del(&inf->expiring); | |
391 | spin_unlock(&sbi->lookup_lock); | |
f50b6f86 IK |
392 | } |
393 | ||
c3724b12 JM |
394 | inf->dentry = NULL; |
395 | inf->inode = NULL; | |
396 | ||
1da177e4 LT |
397 | autofs4_free_ino(inf); |
398 | } | |
399 | } | |
400 | ||
401 | /* For dentries of directories in the root dir */ | |
08f11513 | 402 | static const struct dentry_operations autofs4_root_dentry_operations = { |
1da177e4 LT |
403 | .d_revalidate = autofs4_revalidate, |
404 | .d_release = autofs4_dentry_release, | |
405 | }; | |
406 | ||
407 | /* For other dentries */ | |
08f11513 | 408 | static const struct dentry_operations autofs4_dentry_operations = { |
1da177e4 LT |
409 | .d_revalidate = autofs4_revalidate, |
410 | .d_release = autofs4_dentry_release, | |
411 | }; | |
412 | ||
6510c9d8 | 413 | static struct dentry *autofs4_lookup_active(struct dentry *dentry) |
25767378 | 414 | { |
6510c9d8 IK |
415 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
416 | struct dentry *parent = dentry->d_parent; | |
417 | struct qstr *name = &dentry->d_name; | |
25767378 IK |
418 | unsigned int len = name->len; |
419 | unsigned int hash = name->hash; | |
420 | const unsigned char *str = name->name; | |
421 | struct list_head *p, *head; | |
422 | ||
423 | spin_lock(&dcache_lock); | |
424 | spin_lock(&sbi->lookup_lock); | |
425 | head = &sbi->active_list; | |
426 | list_for_each(p, head) { | |
427 | struct autofs_info *ino; | |
e4d5ade7 | 428 | struct dentry *active; |
25767378 IK |
429 | struct qstr *qstr; |
430 | ||
431 | ino = list_entry(p, struct autofs_info, active); | |
e4d5ade7 | 432 | active = ino->dentry; |
25767378 | 433 | |
e4d5ade7 | 434 | spin_lock(&active->d_lock); |
25767378 IK |
435 | |
436 | /* Already gone? */ | |
e4d5ade7 | 437 | if (atomic_read(&active->d_count) == 0) |
25767378 IK |
438 | goto next; |
439 | ||
e4d5ade7 | 440 | qstr = &active->d_name; |
25767378 | 441 | |
e4d5ade7 | 442 | if (active->d_name.hash != hash) |
25767378 | 443 | goto next; |
e4d5ade7 | 444 | if (active->d_parent != parent) |
25767378 IK |
445 | goto next; |
446 | ||
447 | if (qstr->len != len) | |
448 | goto next; | |
449 | if (memcmp(qstr->name, str, len)) | |
450 | goto next; | |
451 | ||
4b1ae27a AV |
452 | if (d_unhashed(active)) { |
453 | dget(active); | |
454 | spin_unlock(&active->d_lock); | |
455 | spin_unlock(&sbi->lookup_lock); | |
456 | spin_unlock(&dcache_lock); | |
457 | return active; | |
458 | } | |
25767378 | 459 | next: |
e4d5ade7 | 460 | spin_unlock(&active->d_lock); |
25767378 IK |
461 | } |
462 | spin_unlock(&sbi->lookup_lock); | |
463 | spin_unlock(&dcache_lock); | |
464 | ||
465 | return NULL; | |
466 | } | |
467 | ||
6510c9d8 | 468 | static struct dentry *autofs4_lookup_expiring(struct dentry *dentry) |
f50b6f86 | 469 | { |
6510c9d8 IK |
470 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
471 | struct dentry *parent = dentry->d_parent; | |
472 | struct qstr *name = &dentry->d_name; | |
f50b6f86 IK |
473 | unsigned int len = name->len; |
474 | unsigned int hash = name->hash; | |
475 | const unsigned char *str = name->name; | |
476 | struct list_head *p, *head; | |
477 | ||
478 | spin_lock(&dcache_lock); | |
5f6f4f28 IK |
479 | spin_lock(&sbi->lookup_lock); |
480 | head = &sbi->expiring_list; | |
f50b6f86 IK |
481 | list_for_each(p, head) { |
482 | struct autofs_info *ino; | |
cb4b492a | 483 | struct dentry *expiring; |
f50b6f86 IK |
484 | struct qstr *qstr; |
485 | ||
5f6f4f28 | 486 | ino = list_entry(p, struct autofs_info, expiring); |
cb4b492a | 487 | expiring = ino->dentry; |
f50b6f86 | 488 | |
cb4b492a | 489 | spin_lock(&expiring->d_lock); |
f50b6f86 IK |
490 | |
491 | /* Bad luck, we've already been dentry_iput */ | |
cb4b492a | 492 | if (!expiring->d_inode) |
f50b6f86 IK |
493 | goto next; |
494 | ||
cb4b492a | 495 | qstr = &expiring->d_name; |
f50b6f86 | 496 | |
cb4b492a | 497 | if (expiring->d_name.hash != hash) |
f50b6f86 | 498 | goto next; |
cb4b492a | 499 | if (expiring->d_parent != parent) |
f50b6f86 IK |
500 | goto next; |
501 | ||
502 | if (qstr->len != len) | |
503 | goto next; | |
504 | if (memcmp(qstr->name, str, len)) | |
505 | goto next; | |
506 | ||
4b1ae27a AV |
507 | if (d_unhashed(expiring)) { |
508 | dget(expiring); | |
509 | spin_unlock(&expiring->d_lock); | |
510 | spin_unlock(&sbi->lookup_lock); | |
511 | spin_unlock(&dcache_lock); | |
512 | return expiring; | |
513 | } | |
f50b6f86 | 514 | next: |
cb4b492a | 515 | spin_unlock(&expiring->d_lock); |
f50b6f86 | 516 | } |
5f6f4f28 | 517 | spin_unlock(&sbi->lookup_lock); |
f50b6f86 IK |
518 | spin_unlock(&dcache_lock); |
519 | ||
520 | return NULL; | |
521 | } | |
522 | ||
1da177e4 LT |
523 | /* Lookups in the root directory */ |
524 | static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) | |
525 | { | |
526 | struct autofs_sb_info *sbi; | |
25767378 | 527 | struct autofs_info *ino; |
90387c9c | 528 | struct dentry *expiring, *active; |
1da177e4 LT |
529 | int oz_mode; |
530 | ||
531 | DPRINTK("name = %.*s", | |
532 | dentry->d_name.len, dentry->d_name.name); | |
533 | ||
718c604a | 534 | /* File name too long to exist */ |
1da177e4 | 535 | if (dentry->d_name.len > NAME_MAX) |
718c604a | 536 | return ERR_PTR(-ENAMETOOLONG); |
1da177e4 LT |
537 | |
538 | sbi = autofs4_sbi(dir->i_sb); | |
1da177e4 | 539 | oz_mode = autofs4_oz_mode(sbi); |
718c604a | 540 | |
1da177e4 | 541 | DPRINTK("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d", |
a47afb0f | 542 | current->pid, task_pgrp_nr(current), sbi->catatonic, oz_mode); |
1da177e4 | 543 | |
6510c9d8 | 544 | active = autofs4_lookup_active(dentry); |
90387c9c IK |
545 | if (active) { |
546 | dentry = active; | |
aa952eb2 IK |
547 | ino = autofs4_dentry_ino(dentry); |
548 | } else { | |
4b1ae27a AV |
549 | /* |
550 | * Mark the dentry incomplete but don't hash it. We do this | |
551 | * to serialize our inode creation operations (symlink and | |
552 | * mkdir) which prevents deadlock during the callback to | |
553 | * the daemon. Subsequent user space lookups for the same | |
554 | * dentry are placed on the wait queue while the daemon | |
555 | * itself is allowed passage unresticted so the create | |
556 | * operation itself can then hash the dentry. Finally, | |
557 | * we check for the hashed dentry and return the newly | |
558 | * hashed dentry. | |
559 | */ | |
560 | dentry->d_op = &autofs4_root_dentry_operations; | |
561 | ||
562 | /* | |
563 | * And we need to ensure that the same dentry is used for | |
564 | * all following lookup calls until it is hashed so that | |
565 | * the dentry flags are persistent throughout the request. | |
566 | */ | |
567 | ino = autofs4_init_ino(NULL, sbi, 0555); | |
568 | if (!ino) | |
569 | return ERR_PTR(-ENOMEM); | |
570 | ||
571 | dentry->d_fsdata = ino; | |
572 | ino->dentry = dentry; | |
5f6f4f28 | 573 | |
4b1ae27a AV |
574 | autofs4_add_active(dentry); |
575 | ||
576 | d_instantiate(dentry, NULL); | |
577 | } | |
213614d5 | 578 | |
1da177e4 | 579 | if (!oz_mode) { |
213614d5 | 580 | mutex_unlock(&dir->i_mutex); |
4b1ae27a | 581 | expiring = autofs4_lookup_expiring(dentry); |
8f63aaa8 IK |
582 | if (expiring) { |
583 | /* | |
584 | * If we are racing with expire the request might not | |
585 | * be quite complete but the directory has been removed | |
586 | * so it must have been successful, so just wait for it. | |
587 | */ | |
8f63aaa8 | 588 | autofs4_expire_wait(expiring); |
4b1ae27a | 589 | autofs4_del_expiring(expiring); |
8f63aaa8 IK |
590 | dput(expiring); |
591 | } | |
4b1ae27a | 592 | |
aa952eb2 | 593 | spin_lock(&sbi->fs_lock); |
4b1ae27a | 594 | ino->flags |= AUTOFS_INF_PENDING; |
aa952eb2 | 595 | spin_unlock(&sbi->fs_lock); |
4b1ae27a AV |
596 | if (dentry->d_op && dentry->d_op->d_revalidate) |
597 | (dentry->d_op->d_revalidate)(dentry, nd); | |
598 | mutex_lock(&dir->i_mutex); | |
1da177e4 LT |
599 | } |
600 | ||
601 | /* | |
4b1ae27a | 602 | * If we are still pending, check if we had to handle |
1da177e4 LT |
603 | * a signal. If so we can force a restart.. |
604 | */ | |
4b1ae27a | 605 | if (ino->flags & AUTOFS_INF_PENDING) { |
1da177e4 LT |
606 | /* See if we were interrupted */ |
607 | if (signal_pending(current)) { | |
608 | sigset_t *sigset = ¤t->pending.signal; | |
609 | if (sigismember (sigset, SIGKILL) || | |
610 | sigismember (sigset, SIGQUIT) || | |
611 | sigismember (sigset, SIGINT)) { | |
90387c9c IK |
612 | if (active) |
613 | dput(active); | |
1da177e4 LT |
614 | return ERR_PTR(-ERESTARTNOINTR); |
615 | } | |
616 | } | |
4b1ae27a AV |
617 | if (!oz_mode) { |
618 | spin_lock(&sbi->fs_lock); | |
619 | ino->flags &= ~AUTOFS_INF_PENDING; | |
620 | spin_unlock(&sbi->fs_lock); | |
213614d5 IK |
621 | } |
622 | } | |
c9ffec48 | 623 | |
213614d5 | 624 | /* |
4b1ae27a AV |
625 | * If this dentry is unhashed, then we shouldn't honour this |
626 | * lookup. Returning ENOENT here doesn't do the right thing | |
627 | * for all system calls, but it should be OK for the operations | |
628 | * we permit from an autofs. | |
213614d5 | 629 | */ |
4b1ae27a | 630 | if (!oz_mode && d_unhashed(dentry)) { |
213614d5 | 631 | /* |
4b1ae27a AV |
632 | * A user space application can (and has done in the past) |
633 | * remove and re-create this directory during the callback. | |
634 | * This can leave us with an unhashed dentry, but a | |
635 | * successful mount! So we need to perform another | |
636 | * cached lookup in case the dentry now exists. | |
213614d5 | 637 | */ |
4b1ae27a AV |
638 | struct dentry *parent = dentry->d_parent; |
639 | struct dentry *new = d_lookup(parent, &dentry->d_name); | |
640 | if (new != NULL) | |
641 | dentry = new; | |
642 | else | |
643 | dentry = ERR_PTR(-ENOENT); | |
644 | ||
213614d5 | 645 | if (active) |
4b1ae27a AV |
646 | dput(active); |
647 | ||
648 | return dentry; | |
f50b6f86 IK |
649 | } |
650 | ||
4b1ae27a AV |
651 | if (active) |
652 | return active; | |
653 | ||
1da177e4 LT |
654 | return NULL; |
655 | } | |
656 | ||
657 | static int autofs4_dir_symlink(struct inode *dir, | |
658 | struct dentry *dentry, | |
659 | const char *symname) | |
660 | { | |
661 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); | |
662 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
1aff3c8b | 663 | struct autofs_info *p_ino; |
1da177e4 LT |
664 | struct inode *inode; |
665 | char *cp; | |
666 | ||
667 | DPRINTK("%s <- %.*s", symname, | |
668 | dentry->d_name.len, dentry->d_name.name); | |
669 | ||
670 | if (!autofs4_oz_mode(sbi)) | |
671 | return -EACCES; | |
672 | ||
673 | ino = autofs4_init_ino(ino, sbi, S_IFLNK | 0555); | |
25767378 IK |
674 | if (!ino) |
675 | return -ENOMEM; | |
1da177e4 | 676 | |
4b1ae27a AV |
677 | autofs4_del_active(dentry); |
678 | ||
ef581a74 | 679 | ino->size = strlen(symname); |
25767378 IK |
680 | cp = kmalloc(ino->size + 1, GFP_KERNEL); |
681 | if (!cp) { | |
682 | if (!dentry->d_fsdata) | |
683 | kfree(ino); | |
684 | return -ENOMEM; | |
1da177e4 LT |
685 | } |
686 | ||
687 | strcpy(cp, symname); | |
688 | ||
689 | inode = autofs4_get_inode(dir->i_sb, ino); | |
25767378 IK |
690 | if (!inode) { |
691 | kfree(cp); | |
692 | if (!dentry->d_fsdata) | |
693 | kfree(ino); | |
694 | return -ENOMEM; | |
695 | } | |
1864f7bd | 696 | d_add(dentry, inode); |
1da177e4 LT |
697 | |
698 | if (dir == dir->i_sb->s_root->d_inode) | |
699 | dentry->d_op = &autofs4_root_dentry_operations; | |
700 | else | |
701 | dentry->d_op = &autofs4_dentry_operations; | |
702 | ||
703 | dentry->d_fsdata = ino; | |
704 | ino->dentry = dget(dentry); | |
1aff3c8b IK |
705 | atomic_inc(&ino->count); |
706 | p_ino = autofs4_dentry_ino(dentry->d_parent); | |
707 | if (p_ino && dentry->d_parent != dentry) | |
708 | atomic_inc(&p_ino->count); | |
1da177e4 LT |
709 | ino->inode = inode; |
710 | ||
25767378 | 711 | ino->u.symlink = cp; |
1da177e4 LT |
712 | dir->i_mtime = CURRENT_TIME; |
713 | ||
714 | return 0; | |
715 | } | |
716 | ||
717 | /* | |
718 | * NOTE! | |
719 | * | |
720 | * Normal filesystems would do a "d_delete()" to tell the VFS dcache | |
721 | * that the file no longer exists. However, doing that means that the | |
722 | * VFS layer can turn the dentry into a negative dentry. We don't want | |
f50b6f86 | 723 | * this, because the unlink is probably the result of an expire. |
5f6f4f28 IK |
724 | * We simply d_drop it and add it to a expiring list in the super block, |
725 | * which allows the dentry lookup to check for an incomplete expire. | |
1da177e4 LT |
726 | * |
727 | * If a process is blocked on the dentry waiting for the expire to finish, | |
728 | * it will invalidate the dentry and try to mount with a new one. | |
729 | * | |
730 | * Also see autofs4_dir_rmdir().. | |
731 | */ | |
732 | static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry) | |
733 | { | |
734 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); | |
735 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
1aff3c8b | 736 | struct autofs_info *p_ino; |
1da177e4 LT |
737 | |
738 | /* This allows root to remove symlinks */ | |
d78e53c8 | 739 | if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN)) |
1da177e4 LT |
740 | return -EACCES; |
741 | ||
1aff3c8b IK |
742 | if (atomic_dec_and_test(&ino->count)) { |
743 | p_ino = autofs4_dentry_ino(dentry->d_parent); | |
744 | if (p_ino && dentry->d_parent != dentry) | |
745 | atomic_dec(&p_ino->count); | |
746 | } | |
1da177e4 LT |
747 | dput(ino->dentry); |
748 | ||
749 | dentry->d_inode->i_size = 0; | |
ce71ec36 | 750 | clear_nlink(dentry->d_inode); |
1da177e4 LT |
751 | |
752 | dir->i_mtime = CURRENT_TIME; | |
753 | ||
f50b6f86 | 754 | spin_lock(&dcache_lock); |
4b1ae27a | 755 | autofs4_add_expiring(dentry); |
f50b6f86 IK |
756 | spin_lock(&dentry->d_lock); |
757 | __d_drop(dentry); | |
758 | spin_unlock(&dentry->d_lock); | |
759 | spin_unlock(&dcache_lock); | |
1da177e4 LT |
760 | |
761 | return 0; | |
762 | } | |
763 | ||
764 | static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry) | |
765 | { | |
766 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); | |
767 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
1aff3c8b | 768 | struct autofs_info *p_ino; |
1da177e4 | 769 | |
f50b6f86 IK |
770 | DPRINTK("dentry %p, removing %.*s", |
771 | dentry, dentry->d_name.len, dentry->d_name.name); | |
772 | ||
1da177e4 LT |
773 | if (!autofs4_oz_mode(sbi)) |
774 | return -EACCES; | |
775 | ||
776 | spin_lock(&dcache_lock); | |
777 | if (!list_empty(&dentry->d_subdirs)) { | |
778 | spin_unlock(&dcache_lock); | |
779 | return -ENOTEMPTY; | |
780 | } | |
4b1ae27a | 781 | autofs4_add_expiring(dentry); |
1da177e4 LT |
782 | spin_lock(&dentry->d_lock); |
783 | __d_drop(dentry); | |
784 | spin_unlock(&dentry->d_lock); | |
785 | spin_unlock(&dcache_lock); | |
786 | ||
1aff3c8b IK |
787 | if (atomic_dec_and_test(&ino->count)) { |
788 | p_ino = autofs4_dentry_ino(dentry->d_parent); | |
789 | if (p_ino && dentry->d_parent != dentry) | |
790 | atomic_dec(&p_ino->count); | |
791 | } | |
1da177e4 | 792 | dput(ino->dentry); |
1da177e4 | 793 | dentry->d_inode->i_size = 0; |
ce71ec36 | 794 | clear_nlink(dentry->d_inode); |
1da177e4 LT |
795 | |
796 | if (dir->i_nlink) | |
9a53c3a7 | 797 | drop_nlink(dir); |
1da177e4 LT |
798 | |
799 | return 0; | |
800 | } | |
801 | ||
802 | static int autofs4_dir_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
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 LT |
807 | struct inode *inode; |
808 | ||
d78e53c8 | 809 | if (!autofs4_oz_mode(sbi)) |
1da177e4 LT |
810 | return -EACCES; |
811 | ||
812 | DPRINTK("dentry %p, creating %.*s", | |
813 | dentry, dentry->d_name.len, dentry->d_name.name); | |
814 | ||
815 | ino = autofs4_init_ino(ino, sbi, S_IFDIR | 0555); | |
25767378 IK |
816 | if (!ino) |
817 | return -ENOMEM; | |
818 | ||
4b1ae27a AV |
819 | autofs4_del_active(dentry); |
820 | ||
1da177e4 | 821 | inode = autofs4_get_inode(dir->i_sb, ino); |
25767378 IK |
822 | if (!inode) { |
823 | if (!dentry->d_fsdata) | |
824 | kfree(ino); | |
825 | return -ENOMEM; | |
826 | } | |
1864f7bd | 827 | d_add(dentry, inode); |
1da177e4 LT |
828 | |
829 | if (dir == dir->i_sb->s_root->d_inode) | |
830 | dentry->d_op = &autofs4_root_dentry_operations; | |
831 | else | |
832 | dentry->d_op = &autofs4_dentry_operations; | |
833 | ||
834 | dentry->d_fsdata = ino; | |
835 | ino->dentry = dget(dentry); | |
1aff3c8b IK |
836 | atomic_inc(&ino->count); |
837 | p_ino = autofs4_dentry_ino(dentry->d_parent); | |
838 | if (p_ino && dentry->d_parent != dentry) | |
839 | atomic_inc(&p_ino->count); | |
1da177e4 | 840 | ino->inode = inode; |
d8c76e6f | 841 | inc_nlink(dir); |
1da177e4 LT |
842 | dir->i_mtime = CURRENT_TIME; |
843 | ||
844 | return 0; | |
845 | } | |
846 | ||
847 | /* Get/set timeout ioctl() operation */ | |
c9243f5b AB |
848 | #ifdef CONFIG_COMPAT |
849 | static inline int autofs4_compat_get_set_timeout(struct autofs_sb_info *sbi, | |
850 | compat_ulong_t __user *p) | |
851 | { | |
852 | int rv; | |
853 | unsigned long ntimeout; | |
854 | ||
855 | if ((rv = get_user(ntimeout, p)) || | |
856 | (rv = put_user(sbi->exp_timeout/HZ, p))) | |
857 | return rv; | |
858 | ||
859 | if (ntimeout > UINT_MAX/HZ) | |
860 | sbi->exp_timeout = 0; | |
861 | else | |
862 | sbi->exp_timeout = ntimeout * HZ; | |
863 | ||
864 | return 0; | |
865 | } | |
866 | #endif | |
867 | ||
1da177e4 LT |
868 | static inline int autofs4_get_set_timeout(struct autofs_sb_info *sbi, |
869 | unsigned long __user *p) | |
870 | { | |
871 | int rv; | |
872 | unsigned long ntimeout; | |
873 | ||
d78e53c8 SB |
874 | if ((rv = get_user(ntimeout, p)) || |
875 | (rv = put_user(sbi->exp_timeout/HZ, p))) | |
1da177e4 LT |
876 | return rv; |
877 | ||
d78e53c8 | 878 | if (ntimeout > ULONG_MAX/HZ) |
1da177e4 LT |
879 | sbi->exp_timeout = 0; |
880 | else | |
881 | sbi->exp_timeout = ntimeout * HZ; | |
882 | ||
883 | return 0; | |
884 | } | |
885 | ||
886 | /* Return protocol version */ | |
887 | static inline int autofs4_get_protover(struct autofs_sb_info *sbi, int __user *p) | |
888 | { | |
889 | return put_user(sbi->version, p); | |
890 | } | |
891 | ||
892 | /* Return protocol sub version */ | |
893 | static inline int autofs4_get_protosubver(struct autofs_sb_info *sbi, int __user *p) | |
894 | { | |
895 | return put_user(sbi->sub_version, p); | |
896 | } | |
897 | ||
1da177e4 LT |
898 | /* |
899 | * Tells the daemon whether it can umount the autofs mount. | |
900 | */ | |
901 | static inline int autofs4_ask_umount(struct vfsmount *mnt, int __user *p) | |
902 | { | |
903 | int status = 0; | |
904 | ||
e3474a8e | 905 | if (may_umount(mnt)) |
1da177e4 LT |
906 | status = 1; |
907 | ||
908 | DPRINTK("returning %d", status); | |
909 | ||
910 | status = put_user(status, p); | |
911 | ||
912 | return status; | |
913 | } | |
914 | ||
915 | /* Identify autofs4_dentries - this is so we can tell if there's | |
916 | an extra dentry refcount or not. We only hold a refcount on the | |
917 | dentry if its non-negative (ie, d_inode != NULL) | |
918 | */ | |
919 | int is_autofs4_dentry(struct dentry *dentry) | |
920 | { | |
921 | return dentry && dentry->d_inode && | |
922 | (dentry->d_op == &autofs4_root_dentry_operations || | |
923 | dentry->d_op == &autofs4_dentry_operations) && | |
924 | dentry->d_fsdata != NULL; | |
925 | } | |
926 | ||
927 | /* | |
928 | * ioctl()'s on the root directory is the chief method for the daemon to | |
929 | * generate kernel reactions | |
930 | */ | |
3663df70 FW |
931 | static int autofs4_root_ioctl_unlocked(struct inode *inode, struct file *filp, |
932 | unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
933 | { |
934 | struct autofs_sb_info *sbi = autofs4_sbi(inode->i_sb); | |
935 | void __user *p = (void __user *)arg; | |
936 | ||
937 | DPRINTK("cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u", | |
a47afb0f | 938 | cmd,arg,sbi,task_pgrp_nr(current)); |
1da177e4 | 939 | |
d78e53c8 SB |
940 | if (_IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) || |
941 | _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT) | |
1da177e4 LT |
942 | return -ENOTTY; |
943 | ||
d78e53c8 | 944 | if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN)) |
1da177e4 LT |
945 | return -EPERM; |
946 | ||
947 | switch(cmd) { | |
948 | case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */ | |
949 | return autofs4_wait_release(sbi,(autofs_wqt_t)arg,0); | |
950 | case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */ | |
951 | return autofs4_wait_release(sbi,(autofs_wqt_t)arg,-ENOENT); | |
952 | case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */ | |
953 | autofs4_catatonic_mode(sbi); | |
954 | return 0; | |
955 | case AUTOFS_IOC_PROTOVER: /* Get protocol version */ | |
956 | return autofs4_get_protover(sbi, p); | |
957 | case AUTOFS_IOC_PROTOSUBVER: /* Get protocol sub version */ | |
958 | return autofs4_get_protosubver(sbi, p); | |
959 | case AUTOFS_IOC_SETTIMEOUT: | |
960 | return autofs4_get_set_timeout(sbi, p); | |
c9243f5b AB |
961 | #ifdef CONFIG_COMPAT |
962 | case AUTOFS_IOC_SETTIMEOUT32: | |
963 | return autofs4_compat_get_set_timeout(sbi, p); | |
964 | #endif | |
1da177e4 | 965 | |
1da177e4 | 966 | case AUTOFS_IOC_ASKUMOUNT: |
a4669ed8 | 967 | return autofs4_ask_umount(filp->f_path.mnt, p); |
1da177e4 LT |
968 | |
969 | /* return a single thing to expire */ | |
970 | case AUTOFS_IOC_EXPIRE: | |
a4669ed8 | 971 | return autofs4_expire_run(inode->i_sb,filp->f_path.mnt,sbi, p); |
1da177e4 LT |
972 | /* same as above, but can send multiple expires through pipe */ |
973 | case AUTOFS_IOC_EXPIRE_MULTI: | |
a4669ed8 | 974 | return autofs4_expire_multi(inode->i_sb,filp->f_path.mnt,sbi, p); |
1da177e4 LT |
975 | |
976 | default: | |
977 | return -ENOSYS; | |
978 | } | |
979 | } | |
3663df70 FW |
980 | |
981 | static long autofs4_root_ioctl(struct file *filp, | |
982 | unsigned int cmd, unsigned long arg) | |
983 | { | |
984 | long ret; | |
985 | struct inode *inode = filp->f_dentry->d_inode; | |
986 | ||
987 | lock_kernel(); | |
988 | ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, arg); | |
989 | unlock_kernel(); | |
990 | ||
991 | return ret; | |
992 | } | |
c9243f5b AB |
993 | |
994 | #ifdef CONFIG_COMPAT | |
995 | static long autofs4_root_compat_ioctl(struct file *filp, | |
996 | unsigned int cmd, unsigned long arg) | |
997 | { | |
998 | struct inode *inode = filp->f_path.dentry->d_inode; | |
999 | int ret; | |
1000 | ||
1001 | lock_kernel(); | |
1002 | if (cmd == AUTOFS_IOC_READY || cmd == AUTOFS_IOC_FAIL) | |
1003 | ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, arg); | |
1004 | else | |
1005 | ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, | |
1006 | (unsigned long)compat_ptr(arg)); | |
1007 | unlock_kernel(); | |
1008 | ||
1009 | return ret; | |
1010 | } | |
1011 | #endif |