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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> |
00e300e1 | 22 | #include <linux/mutex.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); |
5a44a73b | 31 | #ifdef CONFIG_COMPAT |
c9243f5b | 32 | static long autofs4_root_compat_ioctl(struct file *,unsigned int,unsigned long); |
5a44a73b | 33 | #endif |
1da177e4 | 34 | static int autofs4_dir_open(struct inode *inode, struct file *file); |
1da177e4 | 35 | static struct dentry *autofs4_lookup(struct inode *,struct dentry *, struct nameidata *); |
34ca959c | 36 | static void *autofs4_follow_link(struct dentry *, struct nameidata *); |
1da177e4 | 37 | |
6d5cb926 IK |
38 | #define TRIGGER_FLAGS (LOOKUP_CONTINUE | LOOKUP_DIRECTORY) |
39 | #define TRIGGER_INTENTS (LOOKUP_OPEN | LOOKUP_CREATE) | |
40 | ||
4b6f5d20 | 41 | const struct file_operations autofs4_root_operations = { |
1da177e4 LT |
42 | .open = dcache_dir_open, |
43 | .release = dcache_dir_close, | |
44 | .read = generic_read_dir, | |
aa55ddf3 | 45 | .readdir = dcache_readdir, |
59af1584 | 46 | .llseek = dcache_dir_lseek, |
3663df70 | 47 | .unlocked_ioctl = autofs4_root_ioctl, |
c9243f5b AB |
48 | #ifdef CONFIG_COMPAT |
49 | .compat_ioctl = autofs4_root_compat_ioctl, | |
50 | #endif | |
1da177e4 LT |
51 | }; |
52 | ||
4b6f5d20 | 53 | const struct file_operations autofs4_dir_operations = { |
1da177e4 | 54 | .open = autofs4_dir_open, |
ff9cd499 | 55 | .release = dcache_dir_close, |
1da177e4 | 56 | .read = generic_read_dir, |
ff9cd499 | 57 | .readdir = dcache_readdir, |
59af1584 | 58 | .llseek = dcache_dir_lseek, |
1da177e4 LT |
59 | }; |
60 | ||
754661f1 | 61 | const struct inode_operations autofs4_indirect_root_inode_operations = { |
1da177e4 LT |
62 | .lookup = autofs4_lookup, |
63 | .unlink = autofs4_dir_unlink, | |
64 | .symlink = autofs4_dir_symlink, | |
65 | .mkdir = autofs4_dir_mkdir, | |
66 | .rmdir = autofs4_dir_rmdir, | |
67 | }; | |
68 | ||
754661f1 | 69 | const struct inode_operations autofs4_direct_root_inode_operations = { |
34ca959c | 70 | .lookup = autofs4_lookup, |
871f9434 IK |
71 | .unlink = autofs4_dir_unlink, |
72 | .mkdir = autofs4_dir_mkdir, | |
73 | .rmdir = autofs4_dir_rmdir, | |
34ca959c IK |
74 | .follow_link = autofs4_follow_link, |
75 | }; | |
76 | ||
754661f1 | 77 | const struct inode_operations autofs4_dir_inode_operations = { |
1da177e4 LT |
78 | .lookup = autofs4_lookup, |
79 | .unlink = autofs4_dir_unlink, | |
80 | .symlink = autofs4_dir_symlink, | |
81 | .mkdir = autofs4_dir_mkdir, | |
82 | .rmdir = autofs4_dir_rmdir, | |
83 | }; | |
84 | ||
4f8427d1 IK |
85 | static void autofs4_add_active(struct dentry *dentry) |
86 | { | |
87 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
88 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
89 | if (ino) { | |
90 | spin_lock(&sbi->lookup_lock); | |
91 | if (!ino->active_count) { | |
92 | if (list_empty(&ino->active)) | |
93 | list_add(&ino->active, &sbi->active_list); | |
94 | } | |
95 | ino->active_count++; | |
96 | spin_unlock(&sbi->lookup_lock); | |
97 | } | |
98 | return; | |
99 | } | |
100 | ||
101 | static void autofs4_del_active(struct dentry *dentry) | |
102 | { | |
103 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
104 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
105 | if (ino) { | |
106 | spin_lock(&sbi->lookup_lock); | |
107 | ino->active_count--; | |
108 | if (!ino->active_count) { | |
109 | if (!list_empty(&ino->active)) | |
110 | list_del_init(&ino->active); | |
111 | } | |
112 | spin_unlock(&sbi->lookup_lock); | |
113 | } | |
114 | return; | |
115 | } | |
116 | ||
36b6413e IK |
117 | static unsigned int autofs4_need_mount(unsigned int flags) |
118 | { | |
119 | unsigned int res = 0; | |
120 | if (flags & (TRIGGER_FLAGS | TRIGGER_INTENTS)) | |
121 | res = 1; | |
122 | return res; | |
123 | } | |
124 | ||
1da177e4 LT |
125 | static int autofs4_dir_open(struct inode *inode, struct file *file) |
126 | { | |
a4669ed8 | 127 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 | 128 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
f360ce3b | 129 | |
1da177e4 LT |
130 | DPRINTK("file=%p dentry=%p %.*s", |
131 | file, dentry, dentry->d_name.len, dentry->d_name.name); | |
132 | ||
133 | if (autofs4_oz_mode(sbi)) | |
134 | goto out; | |
135 | ||
ff9cd499 IK |
136 | /* |
137 | * An empty directory in an autofs file system is always a | |
138 | * mount point. The daemon must have failed to mount this | |
139 | * during lookup so it doesn't exist. This can happen, for | |
140 | * example, if user space returns an incorrect status for a | |
141 | * mount request. Otherwise we're doing a readdir on the | |
142 | * autofs file system so just let the libfs routines handle | |
143 | * it. | |
144 | */ | |
145 | spin_lock(&dcache_lock); | |
c42c7f7e | 146 | if (!d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) { |
1da177e4 | 147 | spin_unlock(&dcache_lock); |
ff9cd499 | 148 | return -ENOENT; |
1da177e4 | 149 | } |
ff9cd499 | 150 | spin_unlock(&dcache_lock); |
1da177e4 | 151 | |
1da177e4 | 152 | out: |
ff9cd499 | 153 | return dcache_dir_open(inode, file); |
1da177e4 LT |
154 | } |
155 | ||
4b1ae27a | 156 | static int try_to_fill_dentry(struct dentry *dentry, int flags) |
1da177e4 | 157 | { |
862b110f | 158 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
718c604a | 159 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
9d2de6ad | 160 | int status; |
1da177e4 | 161 | |
1da177e4 LT |
162 | DPRINTK("dentry=%p %.*s ino=%p", |
163 | dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
164 | ||
718c604a IK |
165 | /* |
166 | * Wait for a pending mount, triggering one if there | |
167 | * isn't one already | |
168 | */ | |
4b1ae27a AV |
169 | if (dentry->d_inode == NULL) { |
170 | DPRINTK("waiting for mount name=%.*s", | |
171 | dentry->d_name.len, dentry->d_name.name); | |
1da177e4 | 172 | |
4b1ae27a | 173 | status = autofs4_wait(sbi, dentry, NFY_MOUNT); |
718c604a | 174 | |
4b1ae27a | 175 | DPRINTK("mount done status=%d", status); |
1da177e4 | 176 | |
4b1ae27a AV |
177 | /* Turn this into a real negative dentry? */ |
178 | if (status == -ENOENT) { | |
179 | spin_lock(&sbi->fs_lock); | |
180 | ino->flags &= ~AUTOFS_INF_PENDING; | |
181 | spin_unlock(&sbi->fs_lock); | |
182 | return status; | |
183 | } else if (status) { | |
184 | /* Return a negative dentry, but leave it "pending" */ | |
185 | return status; | |
186 | } | |
187 | /* Trigger mount for path component or follow link */ | |
188 | } else if (ino->flags & AUTOFS_INF_PENDING || | |
f7422464 | 189 | autofs4_need_mount(flags)) { |
4b1ae27a AV |
190 | DPRINTK("waiting for mount name=%.*s", |
191 | dentry->d_name.len, dentry->d_name.name); | |
1da177e4 | 192 | |
4b1ae27a AV |
193 | spin_lock(&sbi->fs_lock); |
194 | ino->flags |= AUTOFS_INF_PENDING; | |
195 | spin_unlock(&sbi->fs_lock); | |
196 | status = autofs4_wait(sbi, dentry, NFY_MOUNT); | |
197 | ||
198 | DPRINTK("mount done status=%d", status); | |
199 | ||
200 | if (status) { | |
201 | spin_lock(&sbi->fs_lock); | |
202 | ino->flags &= ~AUTOFS_INF_PENDING; | |
203 | spin_unlock(&sbi->fs_lock); | |
204 | return status; | |
205 | } | |
206 | } | |
207 | ||
208 | /* Initialize expiry counter after successful mount */ | |
5fc79d85 | 209 | ino->last_used = jiffies; |
4b1ae27a AV |
210 | |
211 | spin_lock(&sbi->fs_lock); | |
212 | ino->flags &= ~AUTOFS_INF_PENDING; | |
213 | spin_unlock(&sbi->fs_lock); | |
214 | ||
215 | return 0; | |
34ca959c IK |
216 | } |
217 | ||
218 | /* For autofs direct mounts the follow link triggers the mount */ | |
219 | static void *autofs4_follow_link(struct dentry *dentry, struct nameidata *nd) | |
220 | { | |
221 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
a5370553 | 222 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
34ca959c IK |
223 | int oz_mode = autofs4_oz_mode(sbi); |
224 | unsigned int lookup_type; | |
225 | int status; | |
226 | ||
227 | DPRINTK("dentry=%p %.*s oz_mode=%d nd->flags=%d", | |
228 | dentry, dentry->d_name.len, dentry->d_name.name, oz_mode, | |
229 | nd->flags); | |
6e60a9ab IK |
230 | /* |
231 | * For an expire of a covered direct or offset mount we need | |
9393bd07 | 232 | * to break out of follow_down() at the autofs mount trigger |
6e60a9ab IK |
233 | * (d_mounted--), so we can see the expiring flag, and manage |
234 | * the blocking and following here until the expire is completed. | |
235 | */ | |
236 | if (oz_mode) { | |
237 | spin_lock(&sbi->fs_lock); | |
238 | if (ino->flags & AUTOFS_INF_EXPIRING) { | |
239 | spin_unlock(&sbi->fs_lock); | |
240 | /* Follow down to our covering mount. */ | |
9393bd07 | 241 | if (!follow_down(&nd->path)) |
6e60a9ab | 242 | goto done; |
ec6e8c7d | 243 | goto follow; |
6e60a9ab IK |
244 | } |
245 | spin_unlock(&sbi->fs_lock); | |
34ca959c | 246 | goto done; |
6e60a9ab | 247 | } |
34ca959c | 248 | |
6e60a9ab | 249 | /* If an expire request is pending everyone must wait. */ |
06a35985 | 250 | autofs4_expire_wait(dentry); |
871f9434 | 251 | |
6e60a9ab | 252 | /* We trigger a mount for almost all flags */ |
36b6413e | 253 | lookup_type = autofs4_need_mount(nd->flags); |
aa952eb2 IK |
254 | spin_lock(&sbi->fs_lock); |
255 | spin_lock(&dcache_lock); | |
256 | if (!(lookup_type || ino->flags & AUTOFS_INF_PENDING)) { | |
257 | spin_unlock(&dcache_lock); | |
258 | spin_unlock(&sbi->fs_lock); | |
ec6e8c7d | 259 | goto follow; |
aa952eb2 | 260 | } |
6e60a9ab | 261 | |
871f9434 | 262 | /* |
6e60a9ab IK |
263 | * If the dentry contains directories then it is an autofs |
264 | * multi-mount with no root mount offset. So don't try to | |
265 | * mount it again. | |
871f9434 | 266 | */ |
aa952eb2 | 267 | if (ino->flags & AUTOFS_INF_PENDING || |
c42c7f7e | 268 | (!d_mountpoint(dentry) && list_empty(&dentry->d_subdirs))) { |
871f9434 | 269 | spin_unlock(&dcache_lock); |
aa952eb2 | 270 | spin_unlock(&sbi->fs_lock); |
871f9434 | 271 | |
f7422464 | 272 | status = try_to_fill_dentry(dentry, nd->flags); |
871f9434 IK |
273 | if (status) |
274 | goto out_error; | |
275 | ||
6e60a9ab | 276 | goto follow; |
34ca959c | 277 | } |
871f9434 | 278 | spin_unlock(&dcache_lock); |
aa952eb2 | 279 | spin_unlock(&sbi->fs_lock); |
6e60a9ab IK |
280 | follow: |
281 | /* | |
282 | * If there is no root mount it must be an autofs | |
283 | * multi-mount with no root offset so we don't need | |
284 | * to follow it. | |
285 | */ | |
286 | if (d_mountpoint(dentry)) { | |
9393bd07 | 287 | if (!autofs4_follow_mount(&nd->path)) { |
6e60a9ab IK |
288 | status = -ENOENT; |
289 | goto out_error; | |
290 | } | |
291 | } | |
34ca959c IK |
292 | |
293 | done: | |
294 | return NULL; | |
295 | ||
296 | out_error: | |
1d957f9b | 297 | path_put(&nd->path); |
34ca959c | 298 | return ERR_PTR(status); |
1da177e4 LT |
299 | } |
300 | ||
301 | /* | |
302 | * Revalidate is called on every cache lookup. Some of those | |
303 | * cache lookups may actually happen while the dentry is not | |
304 | * yet completely filled in, and revalidate has to delay such | |
305 | * lookups.. | |
306 | */ | |
718c604a | 307 | static int autofs4_revalidate(struct dentry *dentry, struct nameidata *nd) |
1da177e4 | 308 | { |
718c604a | 309 | struct inode *dir = dentry->d_parent->d_inode; |
1da177e4 | 310 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); |
4b1ae27a | 311 | int oz_mode = autofs4_oz_mode(sbi); |
1da177e4 | 312 | int flags = nd ? nd->flags : 0; |
4b1ae27a | 313 | int status = 1; |
1da177e4 | 314 | |
213614d5 | 315 | /* Pending dentry */ |
4b1ae27a | 316 | spin_lock(&sbi->fs_lock); |
1da177e4 | 317 | if (autofs4_ispending(dentry)) { |
4b1ae27a | 318 | /* The daemon never causes a mount to trigger */ |
213614d5 | 319 | spin_unlock(&sbi->fs_lock); |
4b1ae27a AV |
320 | |
321 | if (oz_mode) | |
322 | return 1; | |
bcdc5e01 | 323 | |
06a35985 IK |
324 | /* |
325 | * If the directory has gone away due to an expire | |
326 | * we have been called as ->d_revalidate() and so | |
327 | * we need to return false and proceed to ->lookup(). | |
328 | */ | |
329 | if (autofs4_expire_wait(dentry) == -EAGAIN) | |
330 | return 0; | |
331 | ||
bcdc5e01 IK |
332 | /* |
333 | * A zero status is success otherwise we have a | |
334 | * negative error code. | |
335 | */ | |
4b1ae27a | 336 | status = try_to_fill_dentry(dentry, flags); |
bcdc5e01 | 337 | if (status == 0) |
f50b6f86 IK |
338 | return 1; |
339 | ||
bcdc5e01 | 340 | return status; |
1da177e4 | 341 | } |
4b1ae27a AV |
342 | spin_unlock(&sbi->fs_lock); |
343 | ||
344 | /* Negative dentry.. invalidate if "old" */ | |
345 | if (dentry->d_inode == NULL) | |
346 | return 0; | |
1da177e4 LT |
347 | |
348 | /* Check for a non-mountpoint directory with no contents */ | |
4b1ae27a | 349 | spin_lock(&dcache_lock); |
1da177e4 | 350 | if (S_ISDIR(dentry->d_inode->i_mode) && |
c42c7f7e | 351 | !d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) { |
1da177e4 LT |
352 | DPRINTK("dentry=%p %.*s, emptydir", |
353 | dentry, dentry->d_name.len, dentry->d_name.name); | |
4b1ae27a | 354 | spin_unlock(&dcache_lock); |
97e7449a | 355 | |
4b1ae27a AV |
356 | /* The daemon never causes a mount to trigger */ |
357 | if (oz_mode) | |
358 | return 1; | |
213614d5 | 359 | |
4b1ae27a AV |
360 | /* |
361 | * A zero status is success otherwise we have a | |
362 | * negative error code. | |
363 | */ | |
364 | status = try_to_fill_dentry(dentry, flags); | |
365 | if (status == 0) | |
366 | return 1; | |
213614d5 | 367 | |
4b1ae27a | 368 | return status; |
1da177e4 LT |
369 | } |
370 | spin_unlock(&dcache_lock); | |
371 | ||
1da177e4 LT |
372 | return 1; |
373 | } | |
374 | ||
34ca959c | 375 | void autofs4_dentry_release(struct dentry *de) |
1da177e4 LT |
376 | { |
377 | struct autofs_info *inf; | |
378 | ||
379 | DPRINTK("releasing %p", de); | |
380 | ||
381 | inf = autofs4_dentry_ino(de); | |
382 | de->d_fsdata = NULL; | |
383 | ||
384 | if (inf) { | |
f50b6f86 IK |
385 | struct autofs_sb_info *sbi = autofs4_sbi(de->d_sb); |
386 | ||
f50b6f86 | 387 | if (sbi) { |
5f6f4f28 | 388 | spin_lock(&sbi->lookup_lock); |
25767378 IK |
389 | if (!list_empty(&inf->active)) |
390 | list_del(&inf->active); | |
5f6f4f28 IK |
391 | if (!list_empty(&inf->expiring)) |
392 | list_del(&inf->expiring); | |
393 | spin_unlock(&sbi->lookup_lock); | |
f50b6f86 IK |
394 | } |
395 | ||
c3724b12 JM |
396 | inf->dentry = NULL; |
397 | inf->inode = NULL; | |
398 | ||
1da177e4 LT |
399 | autofs4_free_ino(inf); |
400 | } | |
401 | } | |
402 | ||
403 | /* For dentries of directories in the root dir */ | |
08f11513 | 404 | static const struct dentry_operations autofs4_root_dentry_operations = { |
1da177e4 LT |
405 | .d_revalidate = autofs4_revalidate, |
406 | .d_release = autofs4_dentry_release, | |
407 | }; | |
408 | ||
409 | /* For other dentries */ | |
08f11513 | 410 | static const struct dentry_operations autofs4_dentry_operations = { |
1da177e4 LT |
411 | .d_revalidate = autofs4_revalidate, |
412 | .d_release = autofs4_dentry_release, | |
413 | }; | |
414 | ||
6510c9d8 | 415 | static struct dentry *autofs4_lookup_active(struct dentry *dentry) |
25767378 | 416 | { |
6510c9d8 IK |
417 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
418 | struct dentry *parent = dentry->d_parent; | |
419 | struct qstr *name = &dentry->d_name; | |
25767378 IK |
420 | unsigned int len = name->len; |
421 | unsigned int hash = name->hash; | |
422 | const unsigned char *str = name->name; | |
423 | struct list_head *p, *head; | |
424 | ||
425 | spin_lock(&dcache_lock); | |
426 | spin_lock(&sbi->lookup_lock); | |
427 | head = &sbi->active_list; | |
428 | list_for_each(p, head) { | |
429 | struct autofs_info *ino; | |
e4d5ade7 | 430 | struct dentry *active; |
25767378 IK |
431 | struct qstr *qstr; |
432 | ||
433 | ino = list_entry(p, struct autofs_info, active); | |
e4d5ade7 | 434 | active = ino->dentry; |
25767378 | 435 | |
e4d5ade7 | 436 | spin_lock(&active->d_lock); |
25767378 IK |
437 | |
438 | /* Already gone? */ | |
e4d5ade7 | 439 | if (atomic_read(&active->d_count) == 0) |
25767378 IK |
440 | goto next; |
441 | ||
e4d5ade7 | 442 | qstr = &active->d_name; |
25767378 | 443 | |
e4d5ade7 | 444 | if (active->d_name.hash != hash) |
25767378 | 445 | goto next; |
e4d5ade7 | 446 | if (active->d_parent != parent) |
25767378 IK |
447 | goto next; |
448 | ||
449 | if (qstr->len != len) | |
450 | goto next; | |
451 | if (memcmp(qstr->name, str, len)) | |
452 | goto next; | |
453 | ||
4b1ae27a AV |
454 | if (d_unhashed(active)) { |
455 | dget(active); | |
456 | spin_unlock(&active->d_lock); | |
457 | spin_unlock(&sbi->lookup_lock); | |
458 | spin_unlock(&dcache_lock); | |
459 | return active; | |
460 | } | |
25767378 | 461 | next: |
e4d5ade7 | 462 | spin_unlock(&active->d_lock); |
25767378 IK |
463 | } |
464 | spin_unlock(&sbi->lookup_lock); | |
465 | spin_unlock(&dcache_lock); | |
466 | ||
467 | return NULL; | |
468 | } | |
469 | ||
6510c9d8 | 470 | static struct dentry *autofs4_lookup_expiring(struct dentry *dentry) |
f50b6f86 | 471 | { |
6510c9d8 IK |
472 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
473 | struct dentry *parent = dentry->d_parent; | |
474 | struct qstr *name = &dentry->d_name; | |
f50b6f86 IK |
475 | unsigned int len = name->len; |
476 | unsigned int hash = name->hash; | |
477 | const unsigned char *str = name->name; | |
478 | struct list_head *p, *head; | |
479 | ||
480 | spin_lock(&dcache_lock); | |
5f6f4f28 IK |
481 | spin_lock(&sbi->lookup_lock); |
482 | head = &sbi->expiring_list; | |
f50b6f86 IK |
483 | list_for_each(p, head) { |
484 | struct autofs_info *ino; | |
cb4b492a | 485 | struct dentry *expiring; |
f50b6f86 IK |
486 | struct qstr *qstr; |
487 | ||
5f6f4f28 | 488 | ino = list_entry(p, struct autofs_info, expiring); |
cb4b492a | 489 | expiring = ino->dentry; |
f50b6f86 | 490 | |
cb4b492a | 491 | spin_lock(&expiring->d_lock); |
f50b6f86 IK |
492 | |
493 | /* Bad luck, we've already been dentry_iput */ | |
cb4b492a | 494 | if (!expiring->d_inode) |
f50b6f86 IK |
495 | goto next; |
496 | ||
cb4b492a | 497 | qstr = &expiring->d_name; |
f50b6f86 | 498 | |
cb4b492a | 499 | if (expiring->d_name.hash != hash) |
f50b6f86 | 500 | goto next; |
cb4b492a | 501 | if (expiring->d_parent != parent) |
f50b6f86 IK |
502 | goto next; |
503 | ||
504 | if (qstr->len != len) | |
505 | goto next; | |
506 | if (memcmp(qstr->name, str, len)) | |
507 | goto next; | |
508 | ||
4b1ae27a AV |
509 | if (d_unhashed(expiring)) { |
510 | dget(expiring); | |
511 | spin_unlock(&expiring->d_lock); | |
512 | spin_unlock(&sbi->lookup_lock); | |
513 | spin_unlock(&dcache_lock); | |
514 | return expiring; | |
515 | } | |
f50b6f86 | 516 | next: |
cb4b492a | 517 | spin_unlock(&expiring->d_lock); |
f50b6f86 | 518 | } |
5f6f4f28 | 519 | spin_unlock(&sbi->lookup_lock); |
f50b6f86 IK |
520 | spin_unlock(&dcache_lock); |
521 | ||
522 | return NULL; | |
523 | } | |
524 | ||
1da177e4 LT |
525 | /* Lookups in the root directory */ |
526 | static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) | |
527 | { | |
528 | struct autofs_sb_info *sbi; | |
25767378 | 529 | struct autofs_info *ino; |
90387c9c | 530 | struct dentry *expiring, *active; |
1da177e4 LT |
531 | int oz_mode; |
532 | ||
533 | DPRINTK("name = %.*s", | |
534 | dentry->d_name.len, dentry->d_name.name); | |
535 | ||
718c604a | 536 | /* File name too long to exist */ |
1da177e4 | 537 | if (dentry->d_name.len > NAME_MAX) |
718c604a | 538 | return ERR_PTR(-ENAMETOOLONG); |
1da177e4 LT |
539 | |
540 | sbi = autofs4_sbi(dir->i_sb); | |
1da177e4 | 541 | oz_mode = autofs4_oz_mode(sbi); |
718c604a | 542 | |
1da177e4 | 543 | DPRINTK("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d", |
a47afb0f | 544 | current->pid, task_pgrp_nr(current), sbi->catatonic, oz_mode); |
1da177e4 | 545 | |
6510c9d8 | 546 | active = autofs4_lookup_active(dentry); |
90387c9c IK |
547 | if (active) { |
548 | dentry = active; | |
aa952eb2 IK |
549 | ino = autofs4_dentry_ino(dentry); |
550 | } else { | |
4b1ae27a AV |
551 | /* |
552 | * Mark the dentry incomplete but don't hash it. We do this | |
553 | * to serialize our inode creation operations (symlink and | |
554 | * mkdir) which prevents deadlock during the callback to | |
555 | * the daemon. Subsequent user space lookups for the same | |
556 | * dentry are placed on the wait queue while the daemon | |
557 | * itself is allowed passage unresticted so the create | |
558 | * operation itself can then hash the dentry. Finally, | |
559 | * we check for the hashed dentry and return the newly | |
560 | * hashed dentry. | |
561 | */ | |
562 | dentry->d_op = &autofs4_root_dentry_operations; | |
563 | ||
564 | /* | |
565 | * And we need to ensure that the same dentry is used for | |
566 | * all following lookup calls until it is hashed so that | |
567 | * the dentry flags are persistent throughout the request. | |
568 | */ | |
569 | ino = autofs4_init_ino(NULL, sbi, 0555); | |
570 | if (!ino) | |
571 | return ERR_PTR(-ENOMEM); | |
572 | ||
573 | dentry->d_fsdata = ino; | |
574 | ino->dentry = dentry; | |
5f6f4f28 | 575 | |
4b1ae27a AV |
576 | autofs4_add_active(dentry); |
577 | ||
578 | d_instantiate(dentry, NULL); | |
579 | } | |
213614d5 | 580 | |
1da177e4 | 581 | if (!oz_mode) { |
213614d5 | 582 | mutex_unlock(&dir->i_mutex); |
4b1ae27a | 583 | expiring = autofs4_lookup_expiring(dentry); |
8f63aaa8 IK |
584 | if (expiring) { |
585 | /* | |
586 | * If we are racing with expire the request might not | |
587 | * be quite complete but the directory has been removed | |
588 | * so it must have been successful, so just wait for it. | |
589 | */ | |
8f63aaa8 | 590 | autofs4_expire_wait(expiring); |
4b1ae27a | 591 | autofs4_del_expiring(expiring); |
8f63aaa8 IK |
592 | dput(expiring); |
593 | } | |
4b1ae27a | 594 | |
aa952eb2 | 595 | spin_lock(&sbi->fs_lock); |
4b1ae27a | 596 | ino->flags |= AUTOFS_INF_PENDING; |
aa952eb2 | 597 | spin_unlock(&sbi->fs_lock); |
4b1ae27a AV |
598 | if (dentry->d_op && dentry->d_op->d_revalidate) |
599 | (dentry->d_op->d_revalidate)(dentry, nd); | |
600 | mutex_lock(&dir->i_mutex); | |
1da177e4 LT |
601 | } |
602 | ||
603 | /* | |
4b1ae27a | 604 | * If we are still pending, check if we had to handle |
1da177e4 LT |
605 | * a signal. If so we can force a restart.. |
606 | */ | |
4b1ae27a | 607 | if (ino->flags & AUTOFS_INF_PENDING) { |
1da177e4 LT |
608 | /* See if we were interrupted */ |
609 | if (signal_pending(current)) { | |
610 | sigset_t *sigset = ¤t->pending.signal; | |
611 | if (sigismember (sigset, SIGKILL) || | |
612 | sigismember (sigset, SIGQUIT) || | |
613 | sigismember (sigset, SIGINT)) { | |
90387c9c IK |
614 | if (active) |
615 | dput(active); | |
1da177e4 LT |
616 | return ERR_PTR(-ERESTARTNOINTR); |
617 | } | |
618 | } | |
4b1ae27a AV |
619 | if (!oz_mode) { |
620 | spin_lock(&sbi->fs_lock); | |
621 | ino->flags &= ~AUTOFS_INF_PENDING; | |
622 | spin_unlock(&sbi->fs_lock); | |
213614d5 IK |
623 | } |
624 | } | |
c9ffec48 | 625 | |
213614d5 | 626 | /* |
4b1ae27a AV |
627 | * If this dentry is unhashed, then we shouldn't honour this |
628 | * lookup. Returning ENOENT here doesn't do the right thing | |
629 | * for all system calls, but it should be OK for the operations | |
630 | * we permit from an autofs. | |
213614d5 | 631 | */ |
4b1ae27a | 632 | if (!oz_mode && d_unhashed(dentry)) { |
213614d5 | 633 | /* |
4b1ae27a AV |
634 | * A user space application can (and has done in the past) |
635 | * remove and re-create this directory during the callback. | |
636 | * This can leave us with an unhashed dentry, but a | |
637 | * successful mount! So we need to perform another | |
638 | * cached lookup in case the dentry now exists. | |
213614d5 | 639 | */ |
4b1ae27a AV |
640 | struct dentry *parent = dentry->d_parent; |
641 | struct dentry *new = d_lookup(parent, &dentry->d_name); | |
642 | if (new != NULL) | |
643 | dentry = new; | |
644 | else | |
645 | dentry = ERR_PTR(-ENOENT); | |
646 | ||
213614d5 | 647 | if (active) |
4b1ae27a AV |
648 | dput(active); |
649 | ||
650 | return dentry; | |
f50b6f86 IK |
651 | } |
652 | ||
4b1ae27a AV |
653 | if (active) |
654 | return active; | |
655 | ||
1da177e4 LT |
656 | return NULL; |
657 | } | |
658 | ||
659 | static int autofs4_dir_symlink(struct inode *dir, | |
660 | struct dentry *dentry, | |
661 | const char *symname) | |
662 | { | |
663 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); | |
664 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
1aff3c8b | 665 | struct autofs_info *p_ino; |
1da177e4 LT |
666 | struct inode *inode; |
667 | char *cp; | |
668 | ||
669 | DPRINTK("%s <- %.*s", symname, | |
670 | dentry->d_name.len, dentry->d_name.name); | |
671 | ||
672 | if (!autofs4_oz_mode(sbi)) | |
673 | return -EACCES; | |
674 | ||
675 | ino = autofs4_init_ino(ino, sbi, S_IFLNK | 0555); | |
25767378 IK |
676 | if (!ino) |
677 | return -ENOMEM; | |
1da177e4 | 678 | |
4b1ae27a AV |
679 | autofs4_del_active(dentry); |
680 | ||
ef581a74 | 681 | ino->size = strlen(symname); |
25767378 IK |
682 | cp = kmalloc(ino->size + 1, GFP_KERNEL); |
683 | if (!cp) { | |
684 | if (!dentry->d_fsdata) | |
685 | kfree(ino); | |
686 | return -ENOMEM; | |
1da177e4 LT |
687 | } |
688 | ||
689 | strcpy(cp, symname); | |
690 | ||
691 | inode = autofs4_get_inode(dir->i_sb, ino); | |
25767378 IK |
692 | if (!inode) { |
693 | kfree(cp); | |
694 | if (!dentry->d_fsdata) | |
695 | kfree(ino); | |
696 | return -ENOMEM; | |
697 | } | |
1864f7bd | 698 | d_add(dentry, inode); |
1da177e4 LT |
699 | |
700 | if (dir == dir->i_sb->s_root->d_inode) | |
701 | dentry->d_op = &autofs4_root_dentry_operations; | |
702 | else | |
703 | dentry->d_op = &autofs4_dentry_operations; | |
704 | ||
705 | dentry->d_fsdata = ino; | |
706 | ino->dentry = dget(dentry); | |
1aff3c8b IK |
707 | atomic_inc(&ino->count); |
708 | p_ino = autofs4_dentry_ino(dentry->d_parent); | |
709 | if (p_ino && dentry->d_parent != dentry) | |
710 | atomic_inc(&p_ino->count); | |
1da177e4 LT |
711 | ino->inode = inode; |
712 | ||
25767378 | 713 | ino->u.symlink = cp; |
1da177e4 LT |
714 | dir->i_mtime = CURRENT_TIME; |
715 | ||
716 | return 0; | |
717 | } | |
718 | ||
719 | /* | |
720 | * NOTE! | |
721 | * | |
722 | * Normal filesystems would do a "d_delete()" to tell the VFS dcache | |
723 | * that the file no longer exists. However, doing that means that the | |
724 | * VFS layer can turn the dentry into a negative dentry. We don't want | |
f50b6f86 | 725 | * this, because the unlink is probably the result of an expire. |
5f6f4f28 IK |
726 | * We simply d_drop it and add it to a expiring list in the super block, |
727 | * which allows the dentry lookup to check for an incomplete expire. | |
1da177e4 LT |
728 | * |
729 | * If a process is blocked on the dentry waiting for the expire to finish, | |
730 | * it will invalidate the dentry and try to mount with a new one. | |
731 | * | |
732 | * Also see autofs4_dir_rmdir().. | |
733 | */ | |
734 | static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry) | |
735 | { | |
736 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); | |
737 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
1aff3c8b | 738 | struct autofs_info *p_ino; |
1da177e4 LT |
739 | |
740 | /* This allows root to remove symlinks */ | |
d78e53c8 | 741 | if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN)) |
1da177e4 LT |
742 | return -EACCES; |
743 | ||
1aff3c8b IK |
744 | if (atomic_dec_and_test(&ino->count)) { |
745 | p_ino = autofs4_dentry_ino(dentry->d_parent); | |
746 | if (p_ino && dentry->d_parent != dentry) | |
747 | atomic_dec(&p_ino->count); | |
748 | } | |
1da177e4 LT |
749 | dput(ino->dentry); |
750 | ||
751 | dentry->d_inode->i_size = 0; | |
ce71ec36 | 752 | clear_nlink(dentry->d_inode); |
1da177e4 LT |
753 | |
754 | dir->i_mtime = CURRENT_TIME; | |
755 | ||
f50b6f86 | 756 | spin_lock(&dcache_lock); |
4b1ae27a | 757 | autofs4_add_expiring(dentry); |
f50b6f86 IK |
758 | spin_lock(&dentry->d_lock); |
759 | __d_drop(dentry); | |
760 | spin_unlock(&dentry->d_lock); | |
761 | spin_unlock(&dcache_lock); | |
1da177e4 LT |
762 | |
763 | return 0; | |
764 | } | |
765 | ||
766 | static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry) | |
767 | { | |
768 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); | |
769 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
1aff3c8b | 770 | struct autofs_info *p_ino; |
1da177e4 | 771 | |
f50b6f86 IK |
772 | DPRINTK("dentry %p, removing %.*s", |
773 | dentry, dentry->d_name.len, dentry->d_name.name); | |
774 | ||
1da177e4 LT |
775 | if (!autofs4_oz_mode(sbi)) |
776 | return -EACCES; | |
777 | ||
778 | spin_lock(&dcache_lock); | |
779 | if (!list_empty(&dentry->d_subdirs)) { | |
780 | spin_unlock(&dcache_lock); | |
781 | return -ENOTEMPTY; | |
782 | } | |
4b1ae27a | 783 | autofs4_add_expiring(dentry); |
1da177e4 LT |
784 | spin_lock(&dentry->d_lock); |
785 | __d_drop(dentry); | |
786 | spin_unlock(&dentry->d_lock); | |
787 | spin_unlock(&dcache_lock); | |
788 | ||
1aff3c8b IK |
789 | if (atomic_dec_and_test(&ino->count)) { |
790 | p_ino = autofs4_dentry_ino(dentry->d_parent); | |
791 | if (p_ino && dentry->d_parent != dentry) | |
792 | atomic_dec(&p_ino->count); | |
793 | } | |
1da177e4 | 794 | dput(ino->dentry); |
1da177e4 | 795 | dentry->d_inode->i_size = 0; |
ce71ec36 | 796 | clear_nlink(dentry->d_inode); |
1da177e4 LT |
797 | |
798 | if (dir->i_nlink) | |
9a53c3a7 | 799 | drop_nlink(dir); |
1da177e4 LT |
800 | |
801 | return 0; | |
802 | } | |
803 | ||
804 | static int autofs4_dir_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
805 | { | |
806 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); | |
807 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
1aff3c8b | 808 | struct autofs_info *p_ino; |
1da177e4 LT |
809 | struct inode *inode; |
810 | ||
d78e53c8 | 811 | if (!autofs4_oz_mode(sbi)) |
1da177e4 LT |
812 | return -EACCES; |
813 | ||
814 | DPRINTK("dentry %p, creating %.*s", | |
815 | dentry, dentry->d_name.len, dentry->d_name.name); | |
816 | ||
817 | ino = autofs4_init_ino(ino, sbi, S_IFDIR | 0555); | |
25767378 IK |
818 | if (!ino) |
819 | return -ENOMEM; | |
820 | ||
4b1ae27a AV |
821 | autofs4_del_active(dentry); |
822 | ||
1da177e4 | 823 | inode = autofs4_get_inode(dir->i_sb, ino); |
25767378 IK |
824 | if (!inode) { |
825 | if (!dentry->d_fsdata) | |
826 | kfree(ino); | |
827 | return -ENOMEM; | |
828 | } | |
1864f7bd | 829 | d_add(dentry, inode); |
1da177e4 LT |
830 | |
831 | if (dir == dir->i_sb->s_root->d_inode) | |
832 | dentry->d_op = &autofs4_root_dentry_operations; | |
833 | else | |
834 | dentry->d_op = &autofs4_dentry_operations; | |
835 | ||
836 | dentry->d_fsdata = ino; | |
837 | ino->dentry = dget(dentry); | |
1aff3c8b IK |
838 | atomic_inc(&ino->count); |
839 | p_ino = autofs4_dentry_ino(dentry->d_parent); | |
840 | if (p_ino && dentry->d_parent != dentry) | |
841 | atomic_inc(&p_ino->count); | |
1da177e4 | 842 | ino->inode = inode; |
d8c76e6f | 843 | inc_nlink(dir); |
1da177e4 LT |
844 | dir->i_mtime = CURRENT_TIME; |
845 | ||
846 | return 0; | |
847 | } | |
848 | ||
849 | /* Get/set timeout ioctl() operation */ | |
c9243f5b AB |
850 | #ifdef CONFIG_COMPAT |
851 | static inline int autofs4_compat_get_set_timeout(struct autofs_sb_info *sbi, | |
852 | compat_ulong_t __user *p) | |
853 | { | |
854 | int rv; | |
855 | unsigned long ntimeout; | |
856 | ||
857 | if ((rv = get_user(ntimeout, p)) || | |
858 | (rv = put_user(sbi->exp_timeout/HZ, p))) | |
859 | return rv; | |
860 | ||
861 | if (ntimeout > UINT_MAX/HZ) | |
862 | sbi->exp_timeout = 0; | |
863 | else | |
864 | sbi->exp_timeout = ntimeout * HZ; | |
865 | ||
866 | return 0; | |
867 | } | |
868 | #endif | |
869 | ||
1da177e4 LT |
870 | static inline int autofs4_get_set_timeout(struct autofs_sb_info *sbi, |
871 | unsigned long __user *p) | |
872 | { | |
873 | int rv; | |
874 | unsigned long ntimeout; | |
875 | ||
d78e53c8 SB |
876 | if ((rv = get_user(ntimeout, p)) || |
877 | (rv = put_user(sbi->exp_timeout/HZ, p))) | |
1da177e4 LT |
878 | return rv; |
879 | ||
d78e53c8 | 880 | if (ntimeout > ULONG_MAX/HZ) |
1da177e4 LT |
881 | sbi->exp_timeout = 0; |
882 | else | |
883 | sbi->exp_timeout = ntimeout * HZ; | |
884 | ||
885 | return 0; | |
886 | } | |
887 | ||
888 | /* Return protocol version */ | |
889 | static inline int autofs4_get_protover(struct autofs_sb_info *sbi, int __user *p) | |
890 | { | |
891 | return put_user(sbi->version, p); | |
892 | } | |
893 | ||
894 | /* Return protocol sub version */ | |
895 | static inline int autofs4_get_protosubver(struct autofs_sb_info *sbi, int __user *p) | |
896 | { | |
897 | return put_user(sbi->sub_version, p); | |
898 | } | |
899 | ||
1da177e4 LT |
900 | /* |
901 | * Tells the daemon whether it can umount the autofs mount. | |
902 | */ | |
903 | static inline int autofs4_ask_umount(struct vfsmount *mnt, int __user *p) | |
904 | { | |
905 | int status = 0; | |
906 | ||
e3474a8e | 907 | if (may_umount(mnt)) |
1da177e4 LT |
908 | status = 1; |
909 | ||
910 | DPRINTK("returning %d", status); | |
911 | ||
912 | status = put_user(status, p); | |
913 | ||
914 | return status; | |
915 | } | |
916 | ||
917 | /* Identify autofs4_dentries - this is so we can tell if there's | |
918 | an extra dentry refcount or not. We only hold a refcount on the | |
919 | dentry if its non-negative (ie, d_inode != NULL) | |
920 | */ | |
921 | int is_autofs4_dentry(struct dentry *dentry) | |
922 | { | |
923 | return dentry && dentry->d_inode && | |
924 | (dentry->d_op == &autofs4_root_dentry_operations || | |
925 | dentry->d_op == &autofs4_dentry_operations) && | |
926 | dentry->d_fsdata != NULL; | |
927 | } | |
928 | ||
929 | /* | |
930 | * ioctl()'s on the root directory is the chief method for the daemon to | |
931 | * generate kernel reactions | |
932 | */ | |
3663df70 FW |
933 | static int autofs4_root_ioctl_unlocked(struct inode *inode, struct file *filp, |
934 | unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
935 | { |
936 | struct autofs_sb_info *sbi = autofs4_sbi(inode->i_sb); | |
937 | void __user *p = (void __user *)arg; | |
938 | ||
939 | DPRINTK("cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u", | |
a47afb0f | 940 | cmd,arg,sbi,task_pgrp_nr(current)); |
1da177e4 | 941 | |
d78e53c8 SB |
942 | if (_IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) || |
943 | _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT) | |
1da177e4 LT |
944 | return -ENOTTY; |
945 | ||
d78e53c8 | 946 | if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN)) |
1da177e4 LT |
947 | return -EPERM; |
948 | ||
949 | switch(cmd) { | |
950 | case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */ | |
951 | return autofs4_wait_release(sbi,(autofs_wqt_t)arg,0); | |
952 | case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */ | |
953 | return autofs4_wait_release(sbi,(autofs_wqt_t)arg,-ENOENT); | |
954 | case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */ | |
955 | autofs4_catatonic_mode(sbi); | |
956 | return 0; | |
957 | case AUTOFS_IOC_PROTOVER: /* Get protocol version */ | |
958 | return autofs4_get_protover(sbi, p); | |
959 | case AUTOFS_IOC_PROTOSUBVER: /* Get protocol sub version */ | |
960 | return autofs4_get_protosubver(sbi, p); | |
961 | case AUTOFS_IOC_SETTIMEOUT: | |
962 | return autofs4_get_set_timeout(sbi, p); | |
c9243f5b AB |
963 | #ifdef CONFIG_COMPAT |
964 | case AUTOFS_IOC_SETTIMEOUT32: | |
965 | return autofs4_compat_get_set_timeout(sbi, p); | |
966 | #endif | |
1da177e4 | 967 | |
1da177e4 | 968 | case AUTOFS_IOC_ASKUMOUNT: |
a4669ed8 | 969 | return autofs4_ask_umount(filp->f_path.mnt, p); |
1da177e4 LT |
970 | |
971 | /* return a single thing to expire */ | |
972 | case AUTOFS_IOC_EXPIRE: | |
a4669ed8 | 973 | return autofs4_expire_run(inode->i_sb,filp->f_path.mnt,sbi, p); |
1da177e4 LT |
974 | /* same as above, but can send multiple expires through pipe */ |
975 | case AUTOFS_IOC_EXPIRE_MULTI: | |
a4669ed8 | 976 | return autofs4_expire_multi(inode->i_sb,filp->f_path.mnt,sbi, p); |
1da177e4 LT |
977 | |
978 | default: | |
979 | return -ENOSYS; | |
980 | } | |
981 | } | |
3663df70 | 982 | |
00e300e1 AB |
983 | static DEFINE_MUTEX(autofs4_ioctl_mutex); |
984 | ||
3663df70 FW |
985 | static long autofs4_root_ioctl(struct file *filp, |
986 | unsigned int cmd, unsigned long arg) | |
987 | { | |
988 | long ret; | |
989 | struct inode *inode = filp->f_dentry->d_inode; | |
990 | ||
00e300e1 | 991 | mutex_lock(&autofs4_ioctl_mutex); |
3663df70 | 992 | ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, arg); |
00e300e1 | 993 | mutex_unlock(&autofs4_ioctl_mutex); |
3663df70 FW |
994 | |
995 | return ret; | |
996 | } | |
c9243f5b AB |
997 | |
998 | #ifdef CONFIG_COMPAT | |
999 | static long autofs4_root_compat_ioctl(struct file *filp, | |
1000 | unsigned int cmd, unsigned long arg) | |
1001 | { | |
1002 | struct inode *inode = filp->f_path.dentry->d_inode; | |
1003 | int ret; | |
1004 | ||
00e300e1 | 1005 | mutex_lock(&autofs4_ioctl_mutex); |
c9243f5b AB |
1006 | if (cmd == AUTOFS_IOC_READY || cmd == AUTOFS_IOC_FAIL) |
1007 | ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, arg); | |
1008 | else | |
1009 | ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, | |
1010 | (unsigned long)compat_ptr(arg)); | |
00e300e1 | 1011 | mutex_unlock(&autofs4_ioctl_mutex); |
c9243f5b AB |
1012 | |
1013 | return ret; | |
1014 | } | |
1015 | #endif |