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> |
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 */ | |
207 | if (ino) | |
208 | ino->last_used = jiffies; | |
209 | ||
210 | spin_lock(&sbi->fs_lock); | |
211 | ino->flags &= ~AUTOFS_INF_PENDING; | |
212 | spin_unlock(&sbi->fs_lock); | |
213 | ||
214 | return 0; | |
34ca959c IK |
215 | } |
216 | ||
217 | /* For autofs direct mounts the follow link triggers the mount */ | |
218 | static void *autofs4_follow_link(struct dentry *dentry, struct nameidata *nd) | |
219 | { | |
220 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
a5370553 | 221 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
34ca959c IK |
222 | int oz_mode = autofs4_oz_mode(sbi); |
223 | unsigned int lookup_type; | |
224 | int status; | |
225 | ||
226 | DPRINTK("dentry=%p %.*s oz_mode=%d nd->flags=%d", | |
227 | dentry, dentry->d_name.len, dentry->d_name.name, oz_mode, | |
228 | nd->flags); | |
6e60a9ab IK |
229 | /* |
230 | * For an expire of a covered direct or offset mount we need | |
9393bd07 | 231 | * to break out of follow_down() at the autofs mount trigger |
6e60a9ab IK |
232 | * (d_mounted--), so we can see the expiring flag, and manage |
233 | * the blocking and following here until the expire is completed. | |
234 | */ | |
235 | if (oz_mode) { | |
236 | spin_lock(&sbi->fs_lock); | |
237 | if (ino->flags & AUTOFS_INF_EXPIRING) { | |
238 | spin_unlock(&sbi->fs_lock); | |
239 | /* Follow down to our covering mount. */ | |
9393bd07 | 240 | if (!follow_down(&nd->path)) |
6e60a9ab | 241 | goto done; |
ec6e8c7d | 242 | goto follow; |
6e60a9ab IK |
243 | } |
244 | spin_unlock(&sbi->fs_lock); | |
34ca959c | 245 | goto done; |
6e60a9ab | 246 | } |
34ca959c | 247 | |
6e60a9ab | 248 | /* If an expire request is pending everyone must wait. */ |
06a35985 | 249 | autofs4_expire_wait(dentry); |
871f9434 | 250 | |
6e60a9ab | 251 | /* We trigger a mount for almost all flags */ |
36b6413e | 252 | lookup_type = autofs4_need_mount(nd->flags); |
aa952eb2 IK |
253 | spin_lock(&sbi->fs_lock); |
254 | spin_lock(&dcache_lock); | |
255 | if (!(lookup_type || ino->flags & AUTOFS_INF_PENDING)) { | |
256 | spin_unlock(&dcache_lock); | |
257 | spin_unlock(&sbi->fs_lock); | |
ec6e8c7d | 258 | goto follow; |
aa952eb2 | 259 | } |
6e60a9ab | 260 | |
871f9434 | 261 | /* |
6e60a9ab IK |
262 | * If the dentry contains directories then it is an autofs |
263 | * multi-mount with no root mount offset. So don't try to | |
264 | * mount it again. | |
871f9434 | 265 | */ |
aa952eb2 | 266 | if (ino->flags & AUTOFS_INF_PENDING || |
c42c7f7e | 267 | (!d_mountpoint(dentry) && list_empty(&dentry->d_subdirs))) { |
871f9434 | 268 | spin_unlock(&dcache_lock); |
aa952eb2 | 269 | spin_unlock(&sbi->fs_lock); |
871f9434 | 270 | |
f7422464 | 271 | status = try_to_fill_dentry(dentry, nd->flags); |
871f9434 IK |
272 | if (status) |
273 | goto out_error; | |
274 | ||
6e60a9ab | 275 | goto follow; |
34ca959c | 276 | } |
871f9434 | 277 | spin_unlock(&dcache_lock); |
aa952eb2 | 278 | spin_unlock(&sbi->fs_lock); |
6e60a9ab IK |
279 | follow: |
280 | /* | |
281 | * If there is no root mount it must be an autofs | |
282 | * multi-mount with no root offset so we don't need | |
283 | * to follow it. | |
284 | */ | |
285 | if (d_mountpoint(dentry)) { | |
9393bd07 | 286 | if (!autofs4_follow_mount(&nd->path)) { |
6e60a9ab IK |
287 | status = -ENOENT; |
288 | goto out_error; | |
289 | } | |
290 | } | |
34ca959c IK |
291 | |
292 | done: | |
293 | return NULL; | |
294 | ||
295 | out_error: | |
1d957f9b | 296 | path_put(&nd->path); |
34ca959c | 297 | return ERR_PTR(status); |
1da177e4 LT |
298 | } |
299 | ||
300 | /* | |
301 | * Revalidate is called on every cache lookup. Some of those | |
302 | * cache lookups may actually happen while the dentry is not | |
303 | * yet completely filled in, and revalidate has to delay such | |
304 | * lookups.. | |
305 | */ | |
718c604a | 306 | static int autofs4_revalidate(struct dentry *dentry, struct nameidata *nd) |
1da177e4 | 307 | { |
718c604a | 308 | struct inode *dir = dentry->d_parent->d_inode; |
1da177e4 | 309 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); |
4b1ae27a | 310 | int oz_mode = autofs4_oz_mode(sbi); |
1da177e4 | 311 | int flags = nd ? nd->flags : 0; |
4b1ae27a | 312 | int status = 1; |
1da177e4 | 313 | |
213614d5 | 314 | /* Pending dentry */ |
4b1ae27a | 315 | spin_lock(&sbi->fs_lock); |
1da177e4 | 316 | if (autofs4_ispending(dentry)) { |
4b1ae27a | 317 | /* The daemon never causes a mount to trigger */ |
213614d5 | 318 | spin_unlock(&sbi->fs_lock); |
4b1ae27a AV |
319 | |
320 | if (oz_mode) | |
321 | return 1; | |
bcdc5e01 | 322 | |
06a35985 IK |
323 | /* |
324 | * If the directory has gone away due to an expire | |
325 | * we have been called as ->d_revalidate() and so | |
326 | * we need to return false and proceed to ->lookup(). | |
327 | */ | |
328 | if (autofs4_expire_wait(dentry) == -EAGAIN) | |
329 | return 0; | |
330 | ||
bcdc5e01 IK |
331 | /* |
332 | * A zero status is success otherwise we have a | |
333 | * negative error code. | |
334 | */ | |
4b1ae27a | 335 | status = try_to_fill_dentry(dentry, flags); |
bcdc5e01 | 336 | if (status == 0) |
f50b6f86 IK |
337 | return 1; |
338 | ||
bcdc5e01 | 339 | return status; |
1da177e4 | 340 | } |
4b1ae27a AV |
341 | spin_unlock(&sbi->fs_lock); |
342 | ||
343 | /* Negative dentry.. invalidate if "old" */ | |
344 | if (dentry->d_inode == NULL) | |
345 | return 0; | |
1da177e4 LT |
346 | |
347 | /* Check for a non-mountpoint directory with no contents */ | |
4b1ae27a | 348 | spin_lock(&dcache_lock); |
1da177e4 | 349 | if (S_ISDIR(dentry->d_inode->i_mode) && |
c42c7f7e | 350 | !d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) { |
1da177e4 LT |
351 | DPRINTK("dentry=%p %.*s, emptydir", |
352 | dentry, dentry->d_name.len, dentry->d_name.name); | |
4b1ae27a | 353 | spin_unlock(&dcache_lock); |
97e7449a | 354 | |
4b1ae27a AV |
355 | /* The daemon never causes a mount to trigger */ |
356 | if (oz_mode) | |
357 | return 1; | |
213614d5 | 358 | |
4b1ae27a AV |
359 | /* |
360 | * A zero status is success otherwise we have a | |
361 | * negative error code. | |
362 | */ | |
363 | status = try_to_fill_dentry(dentry, flags); | |
364 | if (status == 0) | |
365 | return 1; | |
213614d5 | 366 | |
4b1ae27a | 367 | return status; |
1da177e4 LT |
368 | } |
369 | spin_unlock(&dcache_lock); | |
370 | ||
1da177e4 LT |
371 | return 1; |
372 | } | |
373 | ||
34ca959c | 374 | void autofs4_dentry_release(struct dentry *de) |
1da177e4 LT |
375 | { |
376 | struct autofs_info *inf; | |
377 | ||
378 | DPRINTK("releasing %p", de); | |
379 | ||
380 | inf = autofs4_dentry_ino(de); | |
381 | de->d_fsdata = NULL; | |
382 | ||
383 | if (inf) { | |
f50b6f86 IK |
384 | struct autofs_sb_info *sbi = autofs4_sbi(de->d_sb); |
385 | ||
f50b6f86 | 386 | if (sbi) { |
5f6f4f28 | 387 | spin_lock(&sbi->lookup_lock); |
25767378 IK |
388 | if (!list_empty(&inf->active)) |
389 | list_del(&inf->active); | |
5f6f4f28 IK |
390 | if (!list_empty(&inf->expiring)) |
391 | list_del(&inf->expiring); | |
392 | spin_unlock(&sbi->lookup_lock); | |
f50b6f86 IK |
393 | } |
394 | ||
c3724b12 JM |
395 | inf->dentry = NULL; |
396 | inf->inode = NULL; | |
397 | ||
1da177e4 LT |
398 | autofs4_free_ino(inf); |
399 | } | |
400 | } | |
401 | ||
402 | /* For dentries of directories in the root dir */ | |
08f11513 | 403 | static const struct dentry_operations autofs4_root_dentry_operations = { |
1da177e4 LT |
404 | .d_revalidate = autofs4_revalidate, |
405 | .d_release = autofs4_dentry_release, | |
406 | }; | |
407 | ||
408 | /* For other dentries */ | |
08f11513 | 409 | static const struct dentry_operations autofs4_dentry_operations = { |
1da177e4 LT |
410 | .d_revalidate = autofs4_revalidate, |
411 | .d_release = autofs4_dentry_release, | |
412 | }; | |
413 | ||
6510c9d8 | 414 | static struct dentry *autofs4_lookup_active(struct dentry *dentry) |
25767378 | 415 | { |
6510c9d8 IK |
416 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
417 | struct dentry *parent = dentry->d_parent; | |
418 | struct qstr *name = &dentry->d_name; | |
25767378 IK |
419 | unsigned int len = name->len; |
420 | unsigned int hash = name->hash; | |
421 | const unsigned char *str = name->name; | |
422 | struct list_head *p, *head; | |
423 | ||
424 | spin_lock(&dcache_lock); | |
425 | spin_lock(&sbi->lookup_lock); | |
426 | head = &sbi->active_list; | |
427 | list_for_each(p, head) { | |
428 | struct autofs_info *ino; | |
e4d5ade7 | 429 | struct dentry *active; |
25767378 IK |
430 | struct qstr *qstr; |
431 | ||
432 | ino = list_entry(p, struct autofs_info, active); | |
e4d5ade7 | 433 | active = ino->dentry; |
25767378 | 434 | |
e4d5ade7 | 435 | spin_lock(&active->d_lock); |
25767378 IK |
436 | |
437 | /* Already gone? */ | |
e4d5ade7 | 438 | if (atomic_read(&active->d_count) == 0) |
25767378 IK |
439 | goto next; |
440 | ||
e4d5ade7 | 441 | qstr = &active->d_name; |
25767378 | 442 | |
e4d5ade7 | 443 | if (active->d_name.hash != hash) |
25767378 | 444 | goto next; |
e4d5ade7 | 445 | if (active->d_parent != parent) |
25767378 IK |
446 | goto next; |
447 | ||
448 | if (qstr->len != len) | |
449 | goto next; | |
450 | if (memcmp(qstr->name, str, len)) | |
451 | goto next; | |
452 | ||
4b1ae27a AV |
453 | if (d_unhashed(active)) { |
454 | dget(active); | |
455 | spin_unlock(&active->d_lock); | |
456 | spin_unlock(&sbi->lookup_lock); | |
457 | spin_unlock(&dcache_lock); | |
458 | return active; | |
459 | } | |
25767378 | 460 | next: |
e4d5ade7 | 461 | spin_unlock(&active->d_lock); |
25767378 IK |
462 | } |
463 | spin_unlock(&sbi->lookup_lock); | |
464 | spin_unlock(&dcache_lock); | |
465 | ||
466 | return NULL; | |
467 | } | |
468 | ||
6510c9d8 | 469 | static struct dentry *autofs4_lookup_expiring(struct dentry *dentry) |
f50b6f86 | 470 | { |
6510c9d8 IK |
471 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
472 | struct dentry *parent = dentry->d_parent; | |
473 | struct qstr *name = &dentry->d_name; | |
f50b6f86 IK |
474 | unsigned int len = name->len; |
475 | unsigned int hash = name->hash; | |
476 | const unsigned char *str = name->name; | |
477 | struct list_head *p, *head; | |
478 | ||
479 | spin_lock(&dcache_lock); | |
5f6f4f28 IK |
480 | spin_lock(&sbi->lookup_lock); |
481 | head = &sbi->expiring_list; | |
f50b6f86 IK |
482 | list_for_each(p, head) { |
483 | struct autofs_info *ino; | |
cb4b492a | 484 | struct dentry *expiring; |
f50b6f86 IK |
485 | struct qstr *qstr; |
486 | ||
5f6f4f28 | 487 | ino = list_entry(p, struct autofs_info, expiring); |
cb4b492a | 488 | expiring = ino->dentry; |
f50b6f86 | 489 | |
cb4b492a | 490 | spin_lock(&expiring->d_lock); |
f50b6f86 IK |
491 | |
492 | /* Bad luck, we've already been dentry_iput */ | |
cb4b492a | 493 | if (!expiring->d_inode) |
f50b6f86 IK |
494 | goto next; |
495 | ||
cb4b492a | 496 | qstr = &expiring->d_name; |
f50b6f86 | 497 | |
cb4b492a | 498 | if (expiring->d_name.hash != hash) |
f50b6f86 | 499 | goto next; |
cb4b492a | 500 | if (expiring->d_parent != parent) |
f50b6f86 IK |
501 | goto next; |
502 | ||
503 | if (qstr->len != len) | |
504 | goto next; | |
505 | if (memcmp(qstr->name, str, len)) | |
506 | goto next; | |
507 | ||
4b1ae27a AV |
508 | if (d_unhashed(expiring)) { |
509 | dget(expiring); | |
510 | spin_unlock(&expiring->d_lock); | |
511 | spin_unlock(&sbi->lookup_lock); | |
512 | spin_unlock(&dcache_lock); | |
513 | return expiring; | |
514 | } | |
f50b6f86 | 515 | next: |
cb4b492a | 516 | spin_unlock(&expiring->d_lock); |
f50b6f86 | 517 | } |
5f6f4f28 | 518 | spin_unlock(&sbi->lookup_lock); |
f50b6f86 IK |
519 | spin_unlock(&dcache_lock); |
520 | ||
521 | return NULL; | |
522 | } | |
523 | ||
1da177e4 LT |
524 | /* Lookups in the root directory */ |
525 | static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) | |
526 | { | |
527 | struct autofs_sb_info *sbi; | |
25767378 | 528 | struct autofs_info *ino; |
90387c9c | 529 | struct dentry *expiring, *active; |
1da177e4 LT |
530 | int oz_mode; |
531 | ||
532 | DPRINTK("name = %.*s", | |
533 | dentry->d_name.len, dentry->d_name.name); | |
534 | ||
718c604a | 535 | /* File name too long to exist */ |
1da177e4 | 536 | if (dentry->d_name.len > NAME_MAX) |
718c604a | 537 | return ERR_PTR(-ENAMETOOLONG); |
1da177e4 LT |
538 | |
539 | sbi = autofs4_sbi(dir->i_sb); | |
1da177e4 | 540 | oz_mode = autofs4_oz_mode(sbi); |
718c604a | 541 | |
1da177e4 | 542 | DPRINTK("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d", |
a47afb0f | 543 | current->pid, task_pgrp_nr(current), sbi->catatonic, oz_mode); |
1da177e4 | 544 | |
6510c9d8 | 545 | active = autofs4_lookup_active(dentry); |
90387c9c IK |
546 | if (active) { |
547 | dentry = active; | |
aa952eb2 IK |
548 | ino = autofs4_dentry_ino(dentry); |
549 | } else { | |
4b1ae27a AV |
550 | /* |
551 | * Mark the dentry incomplete but don't hash it. We do this | |
552 | * to serialize our inode creation operations (symlink and | |
553 | * mkdir) which prevents deadlock during the callback to | |
554 | * the daemon. Subsequent user space lookups for the same | |
555 | * dentry are placed on the wait queue while the daemon | |
556 | * itself is allowed passage unresticted so the create | |
557 | * operation itself can then hash the dentry. Finally, | |
558 | * we check for the hashed dentry and return the newly | |
559 | * hashed dentry. | |
560 | */ | |
561 | dentry->d_op = &autofs4_root_dentry_operations; | |
562 | ||
563 | /* | |
564 | * And we need to ensure that the same dentry is used for | |
565 | * all following lookup calls until it is hashed so that | |
566 | * the dentry flags are persistent throughout the request. | |
567 | */ | |
568 | ino = autofs4_init_ino(NULL, sbi, 0555); | |
569 | if (!ino) | |
570 | return ERR_PTR(-ENOMEM); | |
571 | ||
572 | dentry->d_fsdata = ino; | |
573 | ino->dentry = dentry; | |
5f6f4f28 | 574 | |
4b1ae27a AV |
575 | autofs4_add_active(dentry); |
576 | ||
577 | d_instantiate(dentry, NULL); | |
578 | } | |
213614d5 | 579 | |
1da177e4 | 580 | if (!oz_mode) { |
213614d5 | 581 | mutex_unlock(&dir->i_mutex); |
4b1ae27a | 582 | expiring = autofs4_lookup_expiring(dentry); |
8f63aaa8 IK |
583 | if (expiring) { |
584 | /* | |
585 | * If we are racing with expire the request might not | |
586 | * be quite complete but the directory has been removed | |
587 | * so it must have been successful, so just wait for it. | |
588 | */ | |
8f63aaa8 | 589 | autofs4_expire_wait(expiring); |
4b1ae27a | 590 | autofs4_del_expiring(expiring); |
8f63aaa8 IK |
591 | dput(expiring); |
592 | } | |
4b1ae27a | 593 | |
aa952eb2 | 594 | spin_lock(&sbi->fs_lock); |
4b1ae27a | 595 | ino->flags |= AUTOFS_INF_PENDING; |
aa952eb2 | 596 | spin_unlock(&sbi->fs_lock); |
4b1ae27a AV |
597 | if (dentry->d_op && dentry->d_op->d_revalidate) |
598 | (dentry->d_op->d_revalidate)(dentry, nd); | |
599 | mutex_lock(&dir->i_mutex); | |
1da177e4 LT |
600 | } |
601 | ||
602 | /* | |
4b1ae27a | 603 | * If we are still pending, check if we had to handle |
1da177e4 LT |
604 | * a signal. If so we can force a restart.. |
605 | */ | |
4b1ae27a | 606 | if (ino->flags & AUTOFS_INF_PENDING) { |
1da177e4 LT |
607 | /* See if we were interrupted */ |
608 | if (signal_pending(current)) { | |
609 | sigset_t *sigset = ¤t->pending.signal; | |
610 | if (sigismember (sigset, SIGKILL) || | |
611 | sigismember (sigset, SIGQUIT) || | |
612 | sigismember (sigset, SIGINT)) { | |
90387c9c IK |
613 | if (active) |
614 | dput(active); | |
1da177e4 LT |
615 | return ERR_PTR(-ERESTARTNOINTR); |
616 | } | |
617 | } | |
4b1ae27a AV |
618 | if (!oz_mode) { |
619 | spin_lock(&sbi->fs_lock); | |
620 | ino->flags &= ~AUTOFS_INF_PENDING; | |
621 | spin_unlock(&sbi->fs_lock); | |
213614d5 IK |
622 | } |
623 | } | |
c9ffec48 | 624 | |
213614d5 | 625 | /* |
4b1ae27a AV |
626 | * If this dentry is unhashed, then we shouldn't honour this |
627 | * lookup. Returning ENOENT here doesn't do the right thing | |
628 | * for all system calls, but it should be OK for the operations | |
629 | * we permit from an autofs. | |
213614d5 | 630 | */ |
4b1ae27a | 631 | if (!oz_mode && d_unhashed(dentry)) { |
213614d5 | 632 | /* |
4b1ae27a AV |
633 | * A user space application can (and has done in the past) |
634 | * remove and re-create this directory during the callback. | |
635 | * This can leave us with an unhashed dentry, but a | |
636 | * successful mount! So we need to perform another | |
637 | * cached lookup in case the dentry now exists. | |
213614d5 | 638 | */ |
4b1ae27a AV |
639 | struct dentry *parent = dentry->d_parent; |
640 | struct dentry *new = d_lookup(parent, &dentry->d_name); | |
641 | if (new != NULL) | |
642 | dentry = new; | |
643 | else | |
644 | dentry = ERR_PTR(-ENOENT); | |
645 | ||
213614d5 | 646 | if (active) |
4b1ae27a AV |
647 | dput(active); |
648 | ||
649 | return dentry; | |
f50b6f86 IK |
650 | } |
651 | ||
4b1ae27a AV |
652 | if (active) |
653 | return active; | |
654 | ||
1da177e4 LT |
655 | return NULL; |
656 | } | |
657 | ||
658 | static int autofs4_dir_symlink(struct inode *dir, | |
659 | struct dentry *dentry, | |
660 | const char *symname) | |
661 | { | |
662 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); | |
663 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
1aff3c8b | 664 | struct autofs_info *p_ino; |
1da177e4 LT |
665 | struct inode *inode; |
666 | char *cp; | |
667 | ||
668 | DPRINTK("%s <- %.*s", symname, | |
669 | dentry->d_name.len, dentry->d_name.name); | |
670 | ||
671 | if (!autofs4_oz_mode(sbi)) | |
672 | return -EACCES; | |
673 | ||
674 | ino = autofs4_init_ino(ino, sbi, S_IFLNK | 0555); | |
25767378 IK |
675 | if (!ino) |
676 | return -ENOMEM; | |
1da177e4 | 677 | |
4b1ae27a AV |
678 | autofs4_del_active(dentry); |
679 | ||
ef581a74 | 680 | ino->size = strlen(symname); |
25767378 IK |
681 | cp = kmalloc(ino->size + 1, GFP_KERNEL); |
682 | if (!cp) { | |
683 | if (!dentry->d_fsdata) | |
684 | kfree(ino); | |
685 | return -ENOMEM; | |
1da177e4 LT |
686 | } |
687 | ||
688 | strcpy(cp, symname); | |
689 | ||
690 | inode = autofs4_get_inode(dir->i_sb, ino); | |
25767378 IK |
691 | if (!inode) { |
692 | kfree(cp); | |
693 | if (!dentry->d_fsdata) | |
694 | kfree(ino); | |
695 | return -ENOMEM; | |
696 | } | |
1864f7bd | 697 | d_add(dentry, inode); |
1da177e4 LT |
698 | |
699 | if (dir == dir->i_sb->s_root->d_inode) | |
700 | dentry->d_op = &autofs4_root_dentry_operations; | |
701 | else | |
702 | dentry->d_op = &autofs4_dentry_operations; | |
703 | ||
704 | dentry->d_fsdata = ino; | |
705 | ino->dentry = dget(dentry); | |
1aff3c8b IK |
706 | atomic_inc(&ino->count); |
707 | p_ino = autofs4_dentry_ino(dentry->d_parent); | |
708 | if (p_ino && dentry->d_parent != dentry) | |
709 | atomic_inc(&p_ino->count); | |
1da177e4 LT |
710 | ino->inode = inode; |
711 | ||
25767378 | 712 | ino->u.symlink = cp; |
1da177e4 LT |
713 | dir->i_mtime = CURRENT_TIME; |
714 | ||
715 | return 0; | |
716 | } | |
717 | ||
718 | /* | |
719 | * NOTE! | |
720 | * | |
721 | * Normal filesystems would do a "d_delete()" to tell the VFS dcache | |
722 | * that the file no longer exists. However, doing that means that the | |
723 | * VFS layer can turn the dentry into a negative dentry. We don't want | |
f50b6f86 | 724 | * this, because the unlink is probably the result of an expire. |
5f6f4f28 IK |
725 | * We simply d_drop it and add it to a expiring list in the super block, |
726 | * which allows the dentry lookup to check for an incomplete expire. | |
1da177e4 LT |
727 | * |
728 | * If a process is blocked on the dentry waiting for the expire to finish, | |
729 | * it will invalidate the dentry and try to mount with a new one. | |
730 | * | |
731 | * Also see autofs4_dir_rmdir().. | |
732 | */ | |
733 | static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry) | |
734 | { | |
735 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); | |
736 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
1aff3c8b | 737 | struct autofs_info *p_ino; |
1da177e4 LT |
738 | |
739 | /* This allows root to remove symlinks */ | |
d78e53c8 | 740 | if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN)) |
1da177e4 LT |
741 | return -EACCES; |
742 | ||
1aff3c8b IK |
743 | if (atomic_dec_and_test(&ino->count)) { |
744 | p_ino = autofs4_dentry_ino(dentry->d_parent); | |
745 | if (p_ino && dentry->d_parent != dentry) | |
746 | atomic_dec(&p_ino->count); | |
747 | } | |
1da177e4 LT |
748 | dput(ino->dentry); |
749 | ||
750 | dentry->d_inode->i_size = 0; | |
ce71ec36 | 751 | clear_nlink(dentry->d_inode); |
1da177e4 LT |
752 | |
753 | dir->i_mtime = CURRENT_TIME; | |
754 | ||
f50b6f86 | 755 | spin_lock(&dcache_lock); |
4b1ae27a | 756 | autofs4_add_expiring(dentry); |
f50b6f86 IK |
757 | spin_lock(&dentry->d_lock); |
758 | __d_drop(dentry); | |
759 | spin_unlock(&dentry->d_lock); | |
760 | spin_unlock(&dcache_lock); | |
1da177e4 LT |
761 | |
762 | return 0; | |
763 | } | |
764 | ||
765 | static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry) | |
766 | { | |
767 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); | |
768 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
1aff3c8b | 769 | struct autofs_info *p_ino; |
1da177e4 | 770 | |
f50b6f86 IK |
771 | DPRINTK("dentry %p, removing %.*s", |
772 | dentry, dentry->d_name.len, dentry->d_name.name); | |
773 | ||
1da177e4 LT |
774 | if (!autofs4_oz_mode(sbi)) |
775 | return -EACCES; | |
776 | ||
777 | spin_lock(&dcache_lock); | |
778 | if (!list_empty(&dentry->d_subdirs)) { | |
779 | spin_unlock(&dcache_lock); | |
780 | return -ENOTEMPTY; | |
781 | } | |
4b1ae27a | 782 | autofs4_add_expiring(dentry); |
1da177e4 LT |
783 | spin_lock(&dentry->d_lock); |
784 | __d_drop(dentry); | |
785 | spin_unlock(&dentry->d_lock); | |
786 | spin_unlock(&dcache_lock); | |
787 | ||
1aff3c8b IK |
788 | if (atomic_dec_and_test(&ino->count)) { |
789 | p_ino = autofs4_dentry_ino(dentry->d_parent); | |
790 | if (p_ino && dentry->d_parent != dentry) | |
791 | atomic_dec(&p_ino->count); | |
792 | } | |
1da177e4 | 793 | dput(ino->dentry); |
1da177e4 | 794 | dentry->d_inode->i_size = 0; |
ce71ec36 | 795 | clear_nlink(dentry->d_inode); |
1da177e4 LT |
796 | |
797 | if (dir->i_nlink) | |
9a53c3a7 | 798 | drop_nlink(dir); |
1da177e4 LT |
799 | |
800 | return 0; | |
801 | } | |
802 | ||
803 | static int autofs4_dir_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
804 | { | |
805 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); | |
806 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
1aff3c8b | 807 | struct autofs_info *p_ino; |
1da177e4 LT |
808 | struct inode *inode; |
809 | ||
d78e53c8 | 810 | if (!autofs4_oz_mode(sbi)) |
1da177e4 LT |
811 | return -EACCES; |
812 | ||
813 | DPRINTK("dentry %p, creating %.*s", | |
814 | dentry, dentry->d_name.len, dentry->d_name.name); | |
815 | ||
816 | ino = autofs4_init_ino(ino, sbi, S_IFDIR | 0555); | |
25767378 IK |
817 | if (!ino) |
818 | return -ENOMEM; | |
819 | ||
4b1ae27a AV |
820 | autofs4_del_active(dentry); |
821 | ||
1da177e4 | 822 | inode = autofs4_get_inode(dir->i_sb, ino); |
25767378 IK |
823 | if (!inode) { |
824 | if (!dentry->d_fsdata) | |
825 | kfree(ino); | |
826 | return -ENOMEM; | |
827 | } | |
1864f7bd | 828 | d_add(dentry, inode); |
1da177e4 LT |
829 | |
830 | if (dir == dir->i_sb->s_root->d_inode) | |
831 | dentry->d_op = &autofs4_root_dentry_operations; | |
832 | else | |
833 | dentry->d_op = &autofs4_dentry_operations; | |
834 | ||
835 | dentry->d_fsdata = ino; | |
836 | ino->dentry = dget(dentry); | |
1aff3c8b IK |
837 | atomic_inc(&ino->count); |
838 | p_ino = autofs4_dentry_ino(dentry->d_parent); | |
839 | if (p_ino && dentry->d_parent != dentry) | |
840 | atomic_inc(&p_ino->count); | |
1da177e4 | 841 | ino->inode = inode; |
d8c76e6f | 842 | inc_nlink(dir); |
1da177e4 LT |
843 | dir->i_mtime = CURRENT_TIME; |
844 | ||
845 | return 0; | |
846 | } | |
847 | ||
848 | /* Get/set timeout ioctl() operation */ | |
c9243f5b AB |
849 | #ifdef CONFIG_COMPAT |
850 | static inline int autofs4_compat_get_set_timeout(struct autofs_sb_info *sbi, | |
851 | compat_ulong_t __user *p) | |
852 | { | |
853 | int rv; | |
854 | unsigned long ntimeout; | |
855 | ||
856 | if ((rv = get_user(ntimeout, p)) || | |
857 | (rv = put_user(sbi->exp_timeout/HZ, p))) | |
858 | return rv; | |
859 | ||
860 | if (ntimeout > UINT_MAX/HZ) | |
861 | sbi->exp_timeout = 0; | |
862 | else | |
863 | sbi->exp_timeout = ntimeout * HZ; | |
864 | ||
865 | return 0; | |
866 | } | |
867 | #endif | |
868 | ||
1da177e4 LT |
869 | static inline int autofs4_get_set_timeout(struct autofs_sb_info *sbi, |
870 | unsigned long __user *p) | |
871 | { | |
872 | int rv; | |
873 | unsigned long ntimeout; | |
874 | ||
d78e53c8 SB |
875 | if ((rv = get_user(ntimeout, p)) || |
876 | (rv = put_user(sbi->exp_timeout/HZ, p))) | |
1da177e4 LT |
877 | return rv; |
878 | ||
d78e53c8 | 879 | if (ntimeout > ULONG_MAX/HZ) |
1da177e4 LT |
880 | sbi->exp_timeout = 0; |
881 | else | |
882 | sbi->exp_timeout = ntimeout * HZ; | |
883 | ||
884 | return 0; | |
885 | } | |
886 | ||
887 | /* Return protocol version */ | |
888 | static inline int autofs4_get_protover(struct autofs_sb_info *sbi, int __user *p) | |
889 | { | |
890 | return put_user(sbi->version, p); | |
891 | } | |
892 | ||
893 | /* Return protocol sub version */ | |
894 | static inline int autofs4_get_protosubver(struct autofs_sb_info *sbi, int __user *p) | |
895 | { | |
896 | return put_user(sbi->sub_version, p); | |
897 | } | |
898 | ||
1da177e4 LT |
899 | /* |
900 | * Tells the daemon whether it can umount the autofs mount. | |
901 | */ | |
902 | static inline int autofs4_ask_umount(struct vfsmount *mnt, int __user *p) | |
903 | { | |
904 | int status = 0; | |
905 | ||
e3474a8e | 906 | if (may_umount(mnt)) |
1da177e4 LT |
907 | status = 1; |
908 | ||
909 | DPRINTK("returning %d", status); | |
910 | ||
911 | status = put_user(status, p); | |
912 | ||
913 | return status; | |
914 | } | |
915 | ||
916 | /* Identify autofs4_dentries - this is so we can tell if there's | |
917 | an extra dentry refcount or not. We only hold a refcount on the | |
918 | dentry if its non-negative (ie, d_inode != NULL) | |
919 | */ | |
920 | int is_autofs4_dentry(struct dentry *dentry) | |
921 | { | |
922 | return dentry && dentry->d_inode && | |
923 | (dentry->d_op == &autofs4_root_dentry_operations || | |
924 | dentry->d_op == &autofs4_dentry_operations) && | |
925 | dentry->d_fsdata != NULL; | |
926 | } | |
927 | ||
928 | /* | |
929 | * ioctl()'s on the root directory is the chief method for the daemon to | |
930 | * generate kernel reactions | |
931 | */ | |
3663df70 FW |
932 | static int autofs4_root_ioctl_unlocked(struct inode *inode, struct file *filp, |
933 | unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
934 | { |
935 | struct autofs_sb_info *sbi = autofs4_sbi(inode->i_sb); | |
936 | void __user *p = (void __user *)arg; | |
937 | ||
938 | DPRINTK("cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u", | |
a47afb0f | 939 | cmd,arg,sbi,task_pgrp_nr(current)); |
1da177e4 | 940 | |
d78e53c8 SB |
941 | if (_IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) || |
942 | _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT) | |
1da177e4 LT |
943 | return -ENOTTY; |
944 | ||
d78e53c8 | 945 | if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN)) |
1da177e4 LT |
946 | return -EPERM; |
947 | ||
948 | switch(cmd) { | |
949 | case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */ | |
950 | return autofs4_wait_release(sbi,(autofs_wqt_t)arg,0); | |
951 | case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */ | |
952 | return autofs4_wait_release(sbi,(autofs_wqt_t)arg,-ENOENT); | |
953 | case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */ | |
954 | autofs4_catatonic_mode(sbi); | |
955 | return 0; | |
956 | case AUTOFS_IOC_PROTOVER: /* Get protocol version */ | |
957 | return autofs4_get_protover(sbi, p); | |
958 | case AUTOFS_IOC_PROTOSUBVER: /* Get protocol sub version */ | |
959 | return autofs4_get_protosubver(sbi, p); | |
960 | case AUTOFS_IOC_SETTIMEOUT: | |
961 | return autofs4_get_set_timeout(sbi, p); | |
c9243f5b AB |
962 | #ifdef CONFIG_COMPAT |
963 | case AUTOFS_IOC_SETTIMEOUT32: | |
964 | return autofs4_compat_get_set_timeout(sbi, p); | |
965 | #endif | |
1da177e4 | 966 | |
1da177e4 | 967 | case AUTOFS_IOC_ASKUMOUNT: |
a4669ed8 | 968 | return autofs4_ask_umount(filp->f_path.mnt, p); |
1da177e4 LT |
969 | |
970 | /* return a single thing to expire */ | |
971 | case AUTOFS_IOC_EXPIRE: | |
a4669ed8 | 972 | return autofs4_expire_run(inode->i_sb,filp->f_path.mnt,sbi, p); |
1da177e4 LT |
973 | /* same as above, but can send multiple expires through pipe */ |
974 | case AUTOFS_IOC_EXPIRE_MULTI: | |
a4669ed8 | 975 | return autofs4_expire_multi(inode->i_sb,filp->f_path.mnt,sbi, p); |
1da177e4 LT |
976 | |
977 | default: | |
978 | return -ENOSYS; | |
979 | } | |
980 | } | |
3663df70 FW |
981 | |
982 | static long autofs4_root_ioctl(struct file *filp, | |
983 | unsigned int cmd, unsigned long arg) | |
984 | { | |
985 | long ret; | |
986 | struct inode *inode = filp->f_dentry->d_inode; | |
987 | ||
988 | lock_kernel(); | |
989 | ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, arg); | |
990 | unlock_kernel(); | |
991 | ||
992 | return ret; | |
993 | } | |
c9243f5b AB |
994 | |
995 | #ifdef CONFIG_COMPAT | |
996 | static long autofs4_root_compat_ioctl(struct file *filp, | |
997 | unsigned int cmd, unsigned long arg) | |
998 | { | |
999 | struct inode *inode = filp->f_path.dentry->d_inode; | |
1000 | int ret; | |
1001 | ||
1002 | lock_kernel(); | |
1003 | if (cmd == AUTOFS_IOC_READY || cmd == AUTOFS_IOC_FAIL) | |
1004 | ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, arg); | |
1005 | else | |
1006 | ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, | |
1007 | (unsigned long)compat_ptr(arg)); | |
1008 | unlock_kernel(); | |
1009 | ||
1010 | return ret; | |
1011 | } | |
1012 | #endif |