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1da177e4 LT |
1 | /* -*- linux-c -*- --------------------------------------------------------- * |
2 | * | |
3 | * linux/fs/autofs/root.c | |
4 | * | |
5 | * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved | |
6 | * | |
7 | * This file is part of the Linux kernel and is made available under | |
8 | * the terms of the GNU General Public License, version 2, or at your | |
9 | * option, any later version, incorporated herein by reference. | |
10 | * | |
11 | * ------------------------------------------------------------------------- */ | |
12 | ||
16f7e0fe | 13 | #include <linux/capability.h> |
1da177e4 LT |
14 | #include <linux/errno.h> |
15 | #include <linux/stat.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
1da177e4 LT |
17 | #include <linux/param.h> |
18 | #include <linux/time.h> | |
19 | #include <linux/smp_lock.h> | |
20 | #include "autofs_i.h" | |
21 | ||
22 | static int autofs_root_readdir(struct file *,void *,filldir_t); | |
23 | static struct dentry *autofs_root_lookup(struct inode *,struct dentry *, struct nameidata *); | |
24 | static int autofs_root_symlink(struct inode *,struct dentry *,const char *); | |
25 | static int autofs_root_unlink(struct inode *,struct dentry *); | |
26 | static int autofs_root_rmdir(struct inode *,struct dentry *); | |
27 | static int autofs_root_mkdir(struct inode *,struct dentry *,int); | |
28 | static int autofs_root_ioctl(struct inode *, struct file *,unsigned int,unsigned long); | |
29 | ||
4b6f5d20 | 30 | const struct file_operations autofs_root_operations = { |
1da177e4 LT |
31 | .read = generic_read_dir, |
32 | .readdir = autofs_root_readdir, | |
33 | .ioctl = autofs_root_ioctl, | |
34 | }; | |
35 | ||
754661f1 | 36 | const struct inode_operations autofs_root_inode_operations = { |
1da177e4 LT |
37 | .lookup = autofs_root_lookup, |
38 | .unlink = autofs_root_unlink, | |
39 | .symlink = autofs_root_symlink, | |
40 | .mkdir = autofs_root_mkdir, | |
41 | .rmdir = autofs_root_rmdir, | |
42 | }; | |
43 | ||
44 | static int autofs_root_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
45 | { | |
46 | struct autofs_dir_ent *ent = NULL; | |
47 | struct autofs_dirhash *dirhash; | |
48 | struct autofs_sb_info *sbi; | |
81ed19b0 | 49 | struct inode * inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
50 | off_t onr, nr; |
51 | ||
52 | lock_kernel(); | |
53 | ||
54 | sbi = autofs_sbi(inode->i_sb); | |
55 | dirhash = &sbi->dirhash; | |
56 | nr = filp->f_pos; | |
57 | ||
58 | switch(nr) | |
59 | { | |
60 | case 0: | |
61 | if (filldir(dirent, ".", 1, nr, inode->i_ino, DT_DIR) < 0) | |
62 | goto out; | |
63 | filp->f_pos = ++nr; | |
64 | /* fall through */ | |
65 | case 1: | |
66 | if (filldir(dirent, "..", 2, nr, inode->i_ino, DT_DIR) < 0) | |
67 | goto out; | |
68 | filp->f_pos = ++nr; | |
69 | /* fall through */ | |
70 | default: | |
d78e53c8 SB |
71 | while (onr = nr, ent = autofs_hash_enum(dirhash,&nr,ent)) { |
72 | if (!ent->dentry || d_mountpoint(ent->dentry)) { | |
1da177e4 LT |
73 | if (filldir(dirent,ent->name,ent->len,onr,ent->ino,DT_UNKNOWN) < 0) |
74 | goto out; | |
75 | filp->f_pos = nr; | |
76 | } | |
77 | } | |
78 | break; | |
79 | } | |
80 | ||
81 | out: | |
82 | unlock_kernel(); | |
83 | return 0; | |
84 | } | |
85 | ||
86 | static int try_to_fill_dentry(struct dentry *dentry, struct super_block *sb, struct autofs_sb_info *sbi) | |
87 | { | |
88 | struct inode * inode; | |
89 | struct autofs_dir_ent *ent; | |
90 | int status = 0; | |
91 | ||
d78e53c8 | 92 | if (!(ent = autofs_hash_lookup(&sbi->dirhash, &dentry->d_name))) { |
1da177e4 | 93 | do { |
d78e53c8 SB |
94 | if (status && dentry->d_inode) { |
95 | if (status != -ENOENT) | |
1da177e4 LT |
96 | printk("autofs warning: lookup failure on positive dentry, status = %d, name = %s\n", status, dentry->d_name.name); |
97 | return 0; /* Try to get the kernel to invalidate this dentry */ | |
98 | } | |
99 | ||
100 | /* Turn this into a real negative dentry? */ | |
101 | if (status == -ENOENT) { | |
102 | dentry->d_time = jiffies + AUTOFS_NEGATIVE_TIMEOUT; | |
103 | dentry->d_flags &= ~DCACHE_AUTOFS_PENDING; | |
104 | return 1; | |
105 | } else if (status) { | |
106 | /* Return a negative dentry, but leave it "pending" */ | |
107 | return 1; | |
108 | } | |
109 | status = autofs_wait(sbi, &dentry->d_name); | |
d78e53c8 | 110 | } while (!(ent = autofs_hash_lookup(&sbi->dirhash, &dentry->d_name))); |
1da177e4 LT |
111 | } |
112 | ||
113 | /* Abuse this field as a pointer to the directory entry, used to | |
114 | find the expire list pointers */ | |
115 | dentry->d_time = (unsigned long) ent; | |
116 | ||
117 | if (!dentry->d_inode) { | |
62328a02 DH |
118 | inode = autofs_iget(sb, ent->ino); |
119 | if (IS_ERR(inode)) { | |
1da177e4 LT |
120 | /* Failed, but leave pending for next time */ |
121 | return 1; | |
122 | } | |
123 | dentry->d_inode = inode; | |
124 | } | |
125 | ||
126 | /* If this is a directory that isn't a mount point, bitch at the | |
127 | daemon and fix it in user space */ | |
d78e53c8 | 128 | if (S_ISDIR(dentry->d_inode->i_mode) && !d_mountpoint(dentry)) { |
1da177e4 LT |
129 | return !autofs_wait(sbi, &dentry->d_name); |
130 | } | |
131 | ||
132 | /* We don't update the usages for the autofs daemon itself, this | |
133 | is necessary for recursive autofs mounts */ | |
d78e53c8 | 134 | if (!autofs_oz_mode(sbi)) { |
1da177e4 LT |
135 | autofs_update_usage(&sbi->dirhash,ent); |
136 | } | |
137 | ||
138 | dentry->d_flags &= ~DCACHE_AUTOFS_PENDING; | |
139 | return 1; | |
140 | } | |
141 | ||
142 | ||
143 | /* | |
144 | * Revalidate is called on every cache lookup. Some of those | |
145 | * cache lookups may actually happen while the dentry is not | |
146 | * yet completely filled in, and revalidate has to delay such | |
147 | * lookups.. | |
148 | */ | |
149 | static int autofs_revalidate(struct dentry * dentry, struct nameidata *nd) | |
150 | { | |
151 | struct inode * dir; | |
152 | struct autofs_sb_info *sbi; | |
153 | struct autofs_dir_ent *ent; | |
154 | int res; | |
155 | ||
156 | lock_kernel(); | |
157 | dir = dentry->d_parent->d_inode; | |
158 | sbi = autofs_sbi(dir->i_sb); | |
159 | ||
160 | /* Pending dentry */ | |
d78e53c8 | 161 | if (dentry->d_flags & DCACHE_AUTOFS_PENDING) { |
1da177e4 LT |
162 | if (autofs_oz_mode(sbi)) |
163 | res = 1; | |
164 | else | |
165 | res = try_to_fill_dentry(dentry, dir->i_sb, sbi); | |
166 | unlock_kernel(); | |
167 | return res; | |
168 | } | |
169 | ||
170 | /* Negative dentry.. invalidate if "old" */ | |
171 | if (!dentry->d_inode) { | |
172 | unlock_kernel(); | |
173 | return (dentry->d_time - jiffies <= AUTOFS_NEGATIVE_TIMEOUT); | |
174 | } | |
175 | ||
176 | /* Check for a non-mountpoint directory */ | |
d78e53c8 | 177 | if (S_ISDIR(dentry->d_inode->i_mode) && !d_mountpoint(dentry)) { |
1da177e4 LT |
178 | if (autofs_oz_mode(sbi)) |
179 | res = 1; | |
180 | else | |
181 | res = try_to_fill_dentry(dentry, dir->i_sb, sbi); | |
182 | unlock_kernel(); | |
183 | return res; | |
184 | } | |
185 | ||
186 | /* Update the usage list */ | |
d78e53c8 | 187 | if (!autofs_oz_mode(sbi)) { |
1da177e4 | 188 | ent = (struct autofs_dir_ent *) dentry->d_time; |
d78e53c8 | 189 | if (ent) |
1da177e4 LT |
190 | autofs_update_usage(&sbi->dirhash,ent); |
191 | } | |
192 | unlock_kernel(); | |
193 | return 1; | |
194 | } | |
195 | ||
08f11513 | 196 | static const struct dentry_operations autofs_dentry_operations = { |
1da177e4 LT |
197 | .d_revalidate = autofs_revalidate, |
198 | }; | |
199 | ||
200 | static struct dentry *autofs_root_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) | |
201 | { | |
202 | struct autofs_sb_info *sbi; | |
203 | int oz_mode; | |
204 | ||
205 | DPRINTK(("autofs_root_lookup: name = ")); | |
206 | lock_kernel(); | |
207 | autofs_say(dentry->d_name.name,dentry->d_name.len); | |
208 | ||
209 | if (dentry->d_name.len > NAME_MAX) { | |
210 | unlock_kernel(); | |
211 | return ERR_PTR(-ENAMETOOLONG);/* File name too long to exist */ | |
212 | } | |
213 | ||
214 | sbi = autofs_sbi(dir->i_sb); | |
215 | ||
216 | oz_mode = autofs_oz_mode(sbi); | |
fa0334f1 | 217 | DPRINTK(("autofs_lookup: pid = %u, pgrp = %u, catatonic = %d, " |
69cccb88 | 218 | "oz_mode = %d\n", task_pid_nr(current), |
a47afb0f | 219 | task_pgrp_nr(current), sbi->catatonic, |
fa0334f1 | 220 | oz_mode)); |
1da177e4 LT |
221 | |
222 | /* | |
223 | * Mark the dentry incomplete, but add it. This is needed so | |
224 | * that the VFS layer knows about the dentry, and we can count | |
225 | * on catching any lookups through the revalidate. | |
226 | * | |
227 | * Let all the hard work be done by the revalidate function that | |
228 | * needs to be able to do this anyway.. | |
229 | * | |
230 | * We need to do this before we release the directory semaphore. | |
231 | */ | |
232 | dentry->d_op = &autofs_dentry_operations; | |
233 | dentry->d_flags |= DCACHE_AUTOFS_PENDING; | |
234 | d_add(dentry, NULL); | |
235 | ||
1b1dcc1b | 236 | mutex_unlock(&dir->i_mutex); |
1da177e4 | 237 | autofs_revalidate(dentry, nd); |
1b1dcc1b | 238 | mutex_lock(&dir->i_mutex); |
1da177e4 LT |
239 | |
240 | /* | |
241 | * If we are still pending, check if we had to handle | |
242 | * a signal. If so we can force a restart.. | |
243 | */ | |
244 | if (dentry->d_flags & DCACHE_AUTOFS_PENDING) { | |
245 | /* See if we were interrupted */ | |
246 | if (signal_pending(current)) { | |
247 | sigset_t *sigset = ¤t->pending.signal; | |
248 | if (sigismember (sigset, SIGKILL) || | |
249 | sigismember (sigset, SIGQUIT) || | |
250 | sigismember (sigset, SIGINT)) { | |
251 | unlock_kernel(); | |
252 | return ERR_PTR(-ERESTARTNOINTR); | |
253 | } | |
254 | } | |
255 | } | |
256 | unlock_kernel(); | |
257 | ||
258 | /* | |
259 | * If this dentry is unhashed, then we shouldn't honour this | |
260 | * lookup even if the dentry is positive. Returning ENOENT here | |
261 | * doesn't do the right thing for all system calls, but it should | |
262 | * be OK for the operations we permit from an autofs. | |
263 | */ | |
d78e53c8 | 264 | if (dentry->d_inode && d_unhashed(dentry)) |
1da177e4 LT |
265 | return ERR_PTR(-ENOENT); |
266 | ||
267 | return NULL; | |
268 | } | |
269 | ||
270 | static int autofs_root_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
271 | { | |
272 | struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb); | |
273 | struct autofs_dirhash *dh = &sbi->dirhash; | |
274 | struct autofs_dir_ent *ent; | |
275 | unsigned int n; | |
276 | int slsize; | |
277 | struct autofs_symlink *sl; | |
62328a02 | 278 | struct inode *inode; |
1da177e4 LT |
279 | |
280 | DPRINTK(("autofs_root_symlink: %s <- ", symname)); | |
281 | autofs_say(dentry->d_name.name,dentry->d_name.len); | |
282 | ||
283 | lock_kernel(); | |
d78e53c8 | 284 | if (!autofs_oz_mode(sbi)) { |
1da177e4 LT |
285 | unlock_kernel(); |
286 | return -EACCES; | |
287 | } | |
288 | ||
d78e53c8 | 289 | if (autofs_hash_lookup(dh, &dentry->d_name)) { |
1da177e4 LT |
290 | unlock_kernel(); |
291 | return -EEXIST; | |
292 | } | |
293 | ||
294 | n = find_first_zero_bit(sbi->symlink_bitmap,AUTOFS_MAX_SYMLINKS); | |
d78e53c8 | 295 | if (n >= AUTOFS_MAX_SYMLINKS) { |
1da177e4 LT |
296 | unlock_kernel(); |
297 | return -ENOSPC; | |
298 | } | |
299 | ||
300 | set_bit(n,sbi->symlink_bitmap); | |
301 | sl = &sbi->symlink[n]; | |
302 | sl->len = strlen(symname); | |
303 | sl->data = kmalloc(slsize = sl->len+1, GFP_KERNEL); | |
d78e53c8 | 304 | if (!sl->data) { |
1da177e4 LT |
305 | clear_bit(n,sbi->symlink_bitmap); |
306 | unlock_kernel(); | |
307 | return -ENOSPC; | |
308 | } | |
309 | ||
310 | ent = kmalloc(sizeof(struct autofs_dir_ent), GFP_KERNEL); | |
d78e53c8 | 311 | if (!ent) { |
1da177e4 LT |
312 | kfree(sl->data); |
313 | clear_bit(n,sbi->symlink_bitmap); | |
314 | unlock_kernel(); | |
315 | return -ENOSPC; | |
316 | } | |
317 | ||
318 | ent->name = kmalloc(dentry->d_name.len+1, GFP_KERNEL); | |
d78e53c8 | 319 | if (!ent->name) { |
1da177e4 LT |
320 | kfree(sl->data); |
321 | kfree(ent); | |
322 | clear_bit(n,sbi->symlink_bitmap); | |
323 | unlock_kernel(); | |
324 | return -ENOSPC; | |
325 | } | |
326 | ||
327 | memcpy(sl->data,symname,slsize); | |
328 | sl->mtime = get_seconds(); | |
329 | ||
330 | ent->ino = AUTOFS_FIRST_SYMLINK + n; | |
331 | ent->hash = dentry->d_name.hash; | |
332 | memcpy(ent->name, dentry->d_name.name, 1+(ent->len = dentry->d_name.len)); | |
333 | ent->dentry = NULL; /* We don't keep the dentry for symlinks */ | |
334 | ||
335 | autofs_hash_insert(dh,ent); | |
62328a02 DH |
336 | |
337 | inode = autofs_iget(dir->i_sb, ent->ino); | |
338 | if (IS_ERR(inode)) | |
339 | return PTR_ERR(inode); | |
340 | ||
341 | d_instantiate(dentry, inode); | |
1da177e4 LT |
342 | unlock_kernel(); |
343 | return 0; | |
344 | } | |
345 | ||
346 | /* | |
347 | * NOTE! | |
348 | * | |
349 | * Normal filesystems would do a "d_delete()" to tell the VFS dcache | |
350 | * that the file no longer exists. However, doing that means that the | |
351 | * VFS layer can turn the dentry into a negative dentry, which we | |
352 | * obviously do not want (we're dropping the entry not because it | |
353 | * doesn't exist, but because it has timed out). | |
354 | * | |
355 | * Also see autofs_root_rmdir().. | |
356 | */ | |
357 | static int autofs_root_unlink(struct inode *dir, struct dentry *dentry) | |
358 | { | |
359 | struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb); | |
360 | struct autofs_dirhash *dh = &sbi->dirhash; | |
361 | struct autofs_dir_ent *ent; | |
362 | unsigned int n; | |
363 | ||
364 | /* This allows root to remove symlinks */ | |
365 | lock_kernel(); | |
d78e53c8 | 366 | if (!autofs_oz_mode(sbi) && !capable(CAP_SYS_ADMIN)) { |
1da177e4 LT |
367 | unlock_kernel(); |
368 | return -EACCES; | |
369 | } | |
370 | ||
371 | ent = autofs_hash_lookup(dh, &dentry->d_name); | |
d78e53c8 | 372 | if (!ent) { |
1da177e4 LT |
373 | unlock_kernel(); |
374 | return -ENOENT; | |
375 | } | |
376 | ||
377 | n = ent->ino - AUTOFS_FIRST_SYMLINK; | |
d78e53c8 | 378 | if (n >= AUTOFS_MAX_SYMLINKS) { |
1da177e4 LT |
379 | unlock_kernel(); |
380 | return -EISDIR; /* It's a directory, dummy */ | |
381 | } | |
d78e53c8 | 382 | if (!test_bit(n,sbi->symlink_bitmap)) { |
1da177e4 LT |
383 | unlock_kernel(); |
384 | return -EINVAL; /* Nonexistent symlink? Shouldn't happen */ | |
385 | } | |
386 | ||
387 | dentry->d_time = (unsigned long)(struct autofs_dirhash *)NULL; | |
388 | autofs_hash_delete(ent); | |
389 | clear_bit(n,sbi->symlink_bitmap); | |
390 | kfree(sbi->symlink[n].data); | |
391 | d_drop(dentry); | |
392 | ||
393 | unlock_kernel(); | |
394 | return 0; | |
395 | } | |
396 | ||
397 | static int autofs_root_rmdir(struct inode *dir, struct dentry *dentry) | |
398 | { | |
399 | struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb); | |
400 | struct autofs_dirhash *dh = &sbi->dirhash; | |
401 | struct autofs_dir_ent *ent; | |
402 | ||
403 | lock_kernel(); | |
d78e53c8 | 404 | if (!autofs_oz_mode(sbi)) { |
1da177e4 LT |
405 | unlock_kernel(); |
406 | return -EACCES; | |
407 | } | |
408 | ||
409 | ent = autofs_hash_lookup(dh, &dentry->d_name); | |
d78e53c8 | 410 | if (!ent) { |
1da177e4 LT |
411 | unlock_kernel(); |
412 | return -ENOENT; | |
413 | } | |
414 | ||
d78e53c8 | 415 | if ((unsigned int)ent->ino < AUTOFS_FIRST_DIR_INO) { |
1da177e4 LT |
416 | unlock_kernel(); |
417 | return -ENOTDIR; /* Not a directory */ | |
418 | } | |
419 | ||
d78e53c8 | 420 | if (ent->dentry != dentry) { |
1da177e4 LT |
421 | printk("autofs_rmdir: odentry != dentry for entry %s\n", dentry->d_name.name); |
422 | } | |
423 | ||
424 | dentry->d_time = (unsigned long)(struct autofs_dir_ent *)NULL; | |
425 | autofs_hash_delete(ent); | |
9a53c3a7 | 426 | drop_nlink(dir); |
1da177e4 LT |
427 | d_drop(dentry); |
428 | unlock_kernel(); | |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
433 | static int autofs_root_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
434 | { | |
435 | struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb); | |
436 | struct autofs_dirhash *dh = &sbi->dirhash; | |
437 | struct autofs_dir_ent *ent; | |
62328a02 | 438 | struct inode *inode; |
1da177e4 LT |
439 | ino_t ino; |
440 | ||
441 | lock_kernel(); | |
d78e53c8 | 442 | if (!autofs_oz_mode(sbi)) { |
1da177e4 LT |
443 | unlock_kernel(); |
444 | return -EACCES; | |
445 | } | |
446 | ||
447 | ent = autofs_hash_lookup(dh, &dentry->d_name); | |
d78e53c8 | 448 | if (ent) { |
1da177e4 LT |
449 | unlock_kernel(); |
450 | return -EEXIST; | |
451 | } | |
452 | ||
d78e53c8 | 453 | if (sbi->next_dir_ino < AUTOFS_FIRST_DIR_INO) { |
1da177e4 LT |
454 | printk("autofs: Out of inode numbers -- what the heck did you do??\n"); |
455 | unlock_kernel(); | |
456 | return -ENOSPC; | |
457 | } | |
458 | ino = sbi->next_dir_ino++; | |
459 | ||
460 | ent = kmalloc(sizeof(struct autofs_dir_ent), GFP_KERNEL); | |
d78e53c8 | 461 | if (!ent) { |
1da177e4 LT |
462 | unlock_kernel(); |
463 | return -ENOSPC; | |
464 | } | |
465 | ||
466 | ent->name = kmalloc(dentry->d_name.len+1, GFP_KERNEL); | |
d78e53c8 | 467 | if (!ent->name) { |
1da177e4 LT |
468 | kfree(ent); |
469 | unlock_kernel(); | |
470 | return -ENOSPC; | |
471 | } | |
472 | ||
473 | ent->hash = dentry->d_name.hash; | |
474 | memcpy(ent->name, dentry->d_name.name, 1+(ent->len = dentry->d_name.len)); | |
475 | ent->ino = ino; | |
476 | ent->dentry = dentry; | |
477 | autofs_hash_insert(dh,ent); | |
478 | ||
d8c76e6f | 479 | inc_nlink(dir); |
62328a02 DH |
480 | |
481 | inode = autofs_iget(dir->i_sb, ino); | |
482 | if (IS_ERR(inode)) { | |
483 | drop_nlink(dir); | |
484 | return PTR_ERR(inode); | |
485 | } | |
486 | ||
487 | d_instantiate(dentry, inode); | |
1da177e4 LT |
488 | unlock_kernel(); |
489 | ||
490 | return 0; | |
491 | } | |
492 | ||
493 | /* Get/set timeout ioctl() operation */ | |
494 | static inline int autofs_get_set_timeout(struct autofs_sb_info *sbi, | |
495 | unsigned long __user *p) | |
496 | { | |
497 | unsigned long ntimeout; | |
498 | ||
499 | if (get_user(ntimeout, p) || | |
500 | put_user(sbi->exp_timeout / HZ, p)) | |
501 | return -EFAULT; | |
502 | ||
d78e53c8 | 503 | if (ntimeout > ULONG_MAX/HZ) |
1da177e4 LT |
504 | sbi->exp_timeout = 0; |
505 | else | |
506 | sbi->exp_timeout = ntimeout * HZ; | |
507 | ||
508 | return 0; | |
509 | } | |
510 | ||
511 | /* Return protocol version */ | |
512 | static inline int autofs_get_protover(int __user *p) | |
513 | { | |
514 | return put_user(AUTOFS_PROTO_VERSION, p); | |
515 | } | |
516 | ||
517 | /* Perform an expiry operation */ | |
518 | static inline int autofs_expire_run(struct super_block *sb, | |
519 | struct autofs_sb_info *sbi, | |
520 | struct vfsmount *mnt, | |
521 | struct autofs_packet_expire __user *pkt_p) | |
522 | { | |
523 | struct autofs_dir_ent *ent; | |
524 | struct autofs_packet_expire pkt; | |
525 | ||
526 | memset(&pkt,0,sizeof pkt); | |
527 | ||
528 | pkt.hdr.proto_version = AUTOFS_PROTO_VERSION; | |
529 | pkt.hdr.type = autofs_ptype_expire; | |
530 | ||
d78e53c8 | 531 | if (!sbi->exp_timeout || !(ent = autofs_expire(sb,sbi,mnt))) |
1da177e4 LT |
532 | return -EAGAIN; |
533 | ||
534 | pkt.len = ent->len; | |
535 | memcpy(pkt.name, ent->name, pkt.len); | |
536 | pkt.name[pkt.len] = '\0'; | |
537 | ||
d78e53c8 | 538 | if (copy_to_user(pkt_p, &pkt, sizeof(struct autofs_packet_expire))) |
1da177e4 LT |
539 | return -EFAULT; |
540 | ||
541 | return 0; | |
542 | } | |
543 | ||
544 | /* | |
545 | * ioctl()'s on the root directory is the chief method for the daemon to | |
546 | * generate kernel reactions | |
547 | */ | |
548 | static int autofs_root_ioctl(struct inode *inode, struct file *filp, | |
549 | unsigned int cmd, unsigned long arg) | |
550 | { | |
551 | struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb); | |
552 | void __user *argp = (void __user *)arg; | |
553 | ||
a47afb0f | 554 | DPRINTK(("autofs_ioctl: cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u\n",cmd,arg,sbi,task_pgrp_nr(current))); |
1da177e4 | 555 | |
d78e53c8 SB |
556 | if (_IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) || |
557 | _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT) | |
1da177e4 LT |
558 | return -ENOTTY; |
559 | ||
d78e53c8 | 560 | if (!autofs_oz_mode(sbi) && !capable(CAP_SYS_ADMIN)) |
1da177e4 LT |
561 | return -EPERM; |
562 | ||
563 | switch(cmd) { | |
564 | case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */ | |
565 | return autofs_wait_release(sbi,(autofs_wqt_t)arg,0); | |
566 | case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */ | |
567 | return autofs_wait_release(sbi,(autofs_wqt_t)arg,-ENOENT); | |
568 | case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */ | |
569 | autofs_catatonic_mode(sbi); | |
570 | return 0; | |
571 | case AUTOFS_IOC_PROTOVER: /* Get protocol version */ | |
572 | return autofs_get_protover(argp); | |
573 | case AUTOFS_IOC_SETTIMEOUT: | |
574 | return autofs_get_set_timeout(sbi, argp); | |
575 | case AUTOFS_IOC_EXPIRE: | |
81ed19b0 | 576 | return autofs_expire_run(inode->i_sb, sbi, filp->f_path.mnt, |
1da177e4 LT |
577 | argp); |
578 | default: | |
579 | return -ENOSYS; | |
580 | } | |
581 | } |