blob: 5efff3c0d886985351bbe1588da8245992974525 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* -*- 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
Randy Dunlap16f7e0f2006-01-11 12:17:46 -080013#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/errno.h>
15#include <linux/stat.h>
16#include <linux/param.h>
17#include <linux/time.h>
18#include <linux/smp_lock.h>
19#include "autofs_i.h"
20
21static int autofs_root_readdir(struct file *,void *,filldir_t);
22static struct dentry *autofs_root_lookup(struct inode *,struct dentry *, struct nameidata *);
23static int autofs_root_symlink(struct inode *,struct dentry *,const char *);
24static int autofs_root_unlink(struct inode *,struct dentry *);
25static int autofs_root_rmdir(struct inode *,struct dentry *);
26static int autofs_root_mkdir(struct inode *,struct dentry *,int);
27static int autofs_root_ioctl(struct inode *, struct file *,unsigned int,unsigned long);
28
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080029const struct file_operations autofs_root_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070030 .read = generic_read_dir,
31 .readdir = autofs_root_readdir,
32 .ioctl = autofs_root_ioctl,
33};
34
Arjan van de Ven754661f2007-02-12 00:55:38 -080035const struct inode_operations autofs_root_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 .lookup = autofs_root_lookup,
37 .unlink = autofs_root_unlink,
38 .symlink = autofs_root_symlink,
39 .mkdir = autofs_root_mkdir,
40 .rmdir = autofs_root_rmdir,
41};
42
43static int autofs_root_readdir(struct file *filp, void *dirent, filldir_t filldir)
44{
45 struct autofs_dir_ent *ent = NULL;
46 struct autofs_dirhash *dirhash;
47 struct autofs_sb_info *sbi;
Josef "Jeff" Sipek81ed19b2006-12-08 02:36:46 -080048 struct inode * inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 off_t onr, nr;
50
51 lock_kernel();
52
53 sbi = autofs_sbi(inode->i_sb);
54 dirhash = &sbi->dirhash;
55 nr = filp->f_pos;
56
57 switch(nr)
58 {
59 case 0:
60 if (filldir(dirent, ".", 1, nr, inode->i_ino, DT_DIR) < 0)
61 goto out;
62 filp->f_pos = ++nr;
63 /* fall through */
64 case 1:
65 if (filldir(dirent, "..", 2, nr, inode->i_ino, DT_DIR) < 0)
66 goto out;
67 filp->f_pos = ++nr;
68 /* fall through */
69 default:
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -070070 while (onr = nr, ent = autofs_hash_enum(dirhash,&nr,ent)) {
71 if (!ent->dentry || d_mountpoint(ent->dentry)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 if (filldir(dirent,ent->name,ent->len,onr,ent->ino,DT_UNKNOWN) < 0)
73 goto out;
74 filp->f_pos = nr;
75 }
76 }
77 break;
78 }
79
80out:
81 unlock_kernel();
82 return 0;
83}
84
85static int try_to_fill_dentry(struct dentry *dentry, struct super_block *sb, struct autofs_sb_info *sbi)
86{
87 struct inode * inode;
88 struct autofs_dir_ent *ent;
89 int status = 0;
90
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -070091 if (!(ent = autofs_hash_lookup(&sbi->dirhash, &dentry->d_name))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 do {
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -070093 if (status && dentry->d_inode) {
94 if (status != -ENOENT)
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 printk("autofs warning: lookup failure on positive dentry, status = %d, name = %s\n", status, dentry->d_name.name);
96 return 0; /* Try to get the kernel to invalidate this dentry */
97 }
98
99 /* Turn this into a real negative dentry? */
100 if (status == -ENOENT) {
101 dentry->d_time = jiffies + AUTOFS_NEGATIVE_TIMEOUT;
102 dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
103 return 1;
104 } else if (status) {
105 /* Return a negative dentry, but leave it "pending" */
106 return 1;
107 }
108 status = autofs_wait(sbi, &dentry->d_name);
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700109 } while (!(ent = autofs_hash_lookup(&sbi->dirhash, &dentry->d_name)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 }
111
112 /* Abuse this field as a pointer to the directory entry, used to
113 find the expire list pointers */
114 dentry->d_time = (unsigned long) ent;
115
116 if (!dentry->d_inode) {
117 inode = iget(sb, ent->ino);
118 if (!inode) {
119 /* Failed, but leave pending for next time */
120 return 1;
121 }
122 dentry->d_inode = inode;
123 }
124
125 /* If this is a directory that isn't a mount point, bitch at the
126 daemon and fix it in user space */
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700127 if (S_ISDIR(dentry->d_inode->i_mode) && !d_mountpoint(dentry)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 return !autofs_wait(sbi, &dentry->d_name);
129 }
130
131 /* We don't update the usages for the autofs daemon itself, this
132 is necessary for recursive autofs mounts */
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700133 if (!autofs_oz_mode(sbi)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 autofs_update_usage(&sbi->dirhash,ent);
135 }
136
137 dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
138 return 1;
139}
140
141
142/*
143 * Revalidate is called on every cache lookup. Some of those
144 * cache lookups may actually happen while the dentry is not
145 * yet completely filled in, and revalidate has to delay such
146 * lookups..
147 */
148static int autofs_revalidate(struct dentry * dentry, struct nameidata *nd)
149{
150 struct inode * dir;
151 struct autofs_sb_info *sbi;
152 struct autofs_dir_ent *ent;
153 int res;
154
155 lock_kernel();
156 dir = dentry->d_parent->d_inode;
157 sbi = autofs_sbi(dir->i_sb);
158
159 /* Pending dentry */
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700160 if (dentry->d_flags & DCACHE_AUTOFS_PENDING) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 if (autofs_oz_mode(sbi))
162 res = 1;
163 else
164 res = try_to_fill_dentry(dentry, dir->i_sb, sbi);
165 unlock_kernel();
166 return res;
167 }
168
169 /* Negative dentry.. invalidate if "old" */
170 if (!dentry->d_inode) {
171 unlock_kernel();
172 return (dentry->d_time - jiffies <= AUTOFS_NEGATIVE_TIMEOUT);
173 }
174
175 /* Check for a non-mountpoint directory */
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700176 if (S_ISDIR(dentry->d_inode->i_mode) && !d_mountpoint(dentry)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 if (autofs_oz_mode(sbi))
178 res = 1;
179 else
180 res = try_to_fill_dentry(dentry, dir->i_sb, sbi);
181 unlock_kernel();
182 return res;
183 }
184
185 /* Update the usage list */
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700186 if (!autofs_oz_mode(sbi)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 ent = (struct autofs_dir_ent *) dentry->d_time;
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700188 if (ent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 autofs_update_usage(&sbi->dirhash,ent);
190 }
191 unlock_kernel();
192 return 1;
193}
194
195static struct dentry_operations autofs_dentry_operations = {
196 .d_revalidate = autofs_revalidate,
197};
198
199static struct dentry *autofs_root_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
200{
201 struct autofs_sb_info *sbi;
202 int oz_mode;
203
204 DPRINTK(("autofs_root_lookup: name = "));
205 lock_kernel();
206 autofs_say(dentry->d_name.name,dentry->d_name.len);
207
208 if (dentry->d_name.len > NAME_MAX) {
209 unlock_kernel();
210 return ERR_PTR(-ENAMETOOLONG);/* File name too long to exist */
211 }
212
213 sbi = autofs_sbi(dir->i_sb);
214
215 oz_mode = autofs_oz_mode(sbi);
Sukadev Bhattiprolufa0334f2007-05-10 22:23:08 -0700216 DPRINTK(("autofs_lookup: pid = %u, pgrp = %u, catatonic = %d, "
Pavel Emelyanov69cccb82007-10-18 23:40:44 -0700217 "oz_mode = %d\n", task_pid_nr(current),
Pavel Emelianova47afb02007-10-18 23:39:46 -0700218 task_pgrp_nr(current), sbi->catatonic,
Sukadev Bhattiprolufa0334f2007-05-10 22:23:08 -0700219 oz_mode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
221 /*
222 * Mark the dentry incomplete, but add it. This is needed so
223 * that the VFS layer knows about the dentry, and we can count
224 * on catching any lookups through the revalidate.
225 *
226 * Let all the hard work be done by the revalidate function that
227 * needs to be able to do this anyway..
228 *
229 * We need to do this before we release the directory semaphore.
230 */
231 dentry->d_op = &autofs_dentry_operations;
232 dentry->d_flags |= DCACHE_AUTOFS_PENDING;
233 d_add(dentry, NULL);
234
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800235 mutex_unlock(&dir->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 autofs_revalidate(dentry, nd);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800237 mutex_lock(&dir->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
239 /*
240 * If we are still pending, check if we had to handle
241 * a signal. If so we can force a restart..
242 */
243 if (dentry->d_flags & DCACHE_AUTOFS_PENDING) {
244 /* See if we were interrupted */
245 if (signal_pending(current)) {
246 sigset_t *sigset = &current->pending.signal;
247 if (sigismember (sigset, SIGKILL) ||
248 sigismember (sigset, SIGQUIT) ||
249 sigismember (sigset, SIGINT)) {
250 unlock_kernel();
251 return ERR_PTR(-ERESTARTNOINTR);
252 }
253 }
254 }
255 unlock_kernel();
256
257 /*
258 * If this dentry is unhashed, then we shouldn't honour this
259 * lookup even if the dentry is positive. Returning ENOENT here
260 * doesn't do the right thing for all system calls, but it should
261 * be OK for the operations we permit from an autofs.
262 */
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700263 if (dentry->d_inode && d_unhashed(dentry))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 return ERR_PTR(-ENOENT);
265
266 return NULL;
267}
268
269static int autofs_root_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
270{
271 struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
272 struct autofs_dirhash *dh = &sbi->dirhash;
273 struct autofs_dir_ent *ent;
274 unsigned int n;
275 int slsize;
276 struct autofs_symlink *sl;
277
278 DPRINTK(("autofs_root_symlink: %s <- ", symname));
279 autofs_say(dentry->d_name.name,dentry->d_name.len);
280
281 lock_kernel();
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700282 if (!autofs_oz_mode(sbi)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 unlock_kernel();
284 return -EACCES;
285 }
286
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700287 if (autofs_hash_lookup(dh, &dentry->d_name)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 unlock_kernel();
289 return -EEXIST;
290 }
291
292 n = find_first_zero_bit(sbi->symlink_bitmap,AUTOFS_MAX_SYMLINKS);
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700293 if (n >= AUTOFS_MAX_SYMLINKS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 unlock_kernel();
295 return -ENOSPC;
296 }
297
298 set_bit(n,sbi->symlink_bitmap);
299 sl = &sbi->symlink[n];
300 sl->len = strlen(symname);
301 sl->data = kmalloc(slsize = sl->len+1, GFP_KERNEL);
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700302 if (!sl->data) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 clear_bit(n,sbi->symlink_bitmap);
304 unlock_kernel();
305 return -ENOSPC;
306 }
307
308 ent = kmalloc(sizeof(struct autofs_dir_ent), GFP_KERNEL);
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700309 if (!ent) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 kfree(sl->data);
311 clear_bit(n,sbi->symlink_bitmap);
312 unlock_kernel();
313 return -ENOSPC;
314 }
315
316 ent->name = kmalloc(dentry->d_name.len+1, GFP_KERNEL);
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700317 if (!ent->name) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 kfree(sl->data);
319 kfree(ent);
320 clear_bit(n,sbi->symlink_bitmap);
321 unlock_kernel();
322 return -ENOSPC;
323 }
324
325 memcpy(sl->data,symname,slsize);
326 sl->mtime = get_seconds();
327
328 ent->ino = AUTOFS_FIRST_SYMLINK + n;
329 ent->hash = dentry->d_name.hash;
330 memcpy(ent->name, dentry->d_name.name, 1+(ent->len = dentry->d_name.len));
331 ent->dentry = NULL; /* We don't keep the dentry for symlinks */
332
333 autofs_hash_insert(dh,ent);
334 d_instantiate(dentry, iget(dir->i_sb,ent->ino));
335 unlock_kernel();
336 return 0;
337}
338
339/*
340 * NOTE!
341 *
342 * Normal filesystems would do a "d_delete()" to tell the VFS dcache
343 * that the file no longer exists. However, doing that means that the
344 * VFS layer can turn the dentry into a negative dentry, which we
345 * obviously do not want (we're dropping the entry not because it
346 * doesn't exist, but because it has timed out).
347 *
348 * Also see autofs_root_rmdir()..
349 */
350static int autofs_root_unlink(struct inode *dir, struct dentry *dentry)
351{
352 struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
353 struct autofs_dirhash *dh = &sbi->dirhash;
354 struct autofs_dir_ent *ent;
355 unsigned int n;
356
357 /* This allows root to remove symlinks */
358 lock_kernel();
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700359 if (!autofs_oz_mode(sbi) && !capable(CAP_SYS_ADMIN)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 unlock_kernel();
361 return -EACCES;
362 }
363
364 ent = autofs_hash_lookup(dh, &dentry->d_name);
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700365 if (!ent) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 unlock_kernel();
367 return -ENOENT;
368 }
369
370 n = ent->ino - AUTOFS_FIRST_SYMLINK;
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700371 if (n >= AUTOFS_MAX_SYMLINKS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 unlock_kernel();
373 return -EISDIR; /* It's a directory, dummy */
374 }
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700375 if (!test_bit(n,sbi->symlink_bitmap)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 unlock_kernel();
377 return -EINVAL; /* Nonexistent symlink? Shouldn't happen */
378 }
379
380 dentry->d_time = (unsigned long)(struct autofs_dirhash *)NULL;
381 autofs_hash_delete(ent);
382 clear_bit(n,sbi->symlink_bitmap);
383 kfree(sbi->symlink[n].data);
384 d_drop(dentry);
385
386 unlock_kernel();
387 return 0;
388}
389
390static int autofs_root_rmdir(struct inode *dir, struct dentry *dentry)
391{
392 struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
393 struct autofs_dirhash *dh = &sbi->dirhash;
394 struct autofs_dir_ent *ent;
395
396 lock_kernel();
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700397 if (!autofs_oz_mode(sbi)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 unlock_kernel();
399 return -EACCES;
400 }
401
402 ent = autofs_hash_lookup(dh, &dentry->d_name);
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700403 if (!ent) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 unlock_kernel();
405 return -ENOENT;
406 }
407
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700408 if ((unsigned int)ent->ino < AUTOFS_FIRST_DIR_INO) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 unlock_kernel();
410 return -ENOTDIR; /* Not a directory */
411 }
412
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700413 if (ent->dentry != dentry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 printk("autofs_rmdir: odentry != dentry for entry %s\n", dentry->d_name.name);
415 }
416
417 dentry->d_time = (unsigned long)(struct autofs_dir_ent *)NULL;
418 autofs_hash_delete(ent);
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700419 drop_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 d_drop(dentry);
421 unlock_kernel();
422
423 return 0;
424}
425
426static int autofs_root_mkdir(struct inode *dir, struct dentry *dentry, int mode)
427{
428 struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
429 struct autofs_dirhash *dh = &sbi->dirhash;
430 struct autofs_dir_ent *ent;
431 ino_t ino;
432
433 lock_kernel();
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700434 if (!autofs_oz_mode(sbi)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 unlock_kernel();
436 return -EACCES;
437 }
438
439 ent = autofs_hash_lookup(dh, &dentry->d_name);
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700440 if (ent) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 unlock_kernel();
442 return -EEXIST;
443 }
444
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700445 if (sbi->next_dir_ino < AUTOFS_FIRST_DIR_INO) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 printk("autofs: Out of inode numbers -- what the heck did you do??\n");
447 unlock_kernel();
448 return -ENOSPC;
449 }
450 ino = sbi->next_dir_ino++;
451
452 ent = kmalloc(sizeof(struct autofs_dir_ent), GFP_KERNEL);
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700453 if (!ent) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 unlock_kernel();
455 return -ENOSPC;
456 }
457
458 ent->name = kmalloc(dentry->d_name.len+1, GFP_KERNEL);
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700459 if (!ent->name) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 kfree(ent);
461 unlock_kernel();
462 return -ENOSPC;
463 }
464
465 ent->hash = dentry->d_name.hash;
466 memcpy(ent->name, dentry->d_name.name, 1+(ent->len = dentry->d_name.len));
467 ent->ino = ino;
468 ent->dentry = dentry;
469 autofs_hash_insert(dh,ent);
470
Dave Hansend8c76e62006-09-30 23:29:04 -0700471 inc_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 d_instantiate(dentry, iget(dir->i_sb,ino));
473 unlock_kernel();
474
475 return 0;
476}
477
478/* Get/set timeout ioctl() operation */
479static inline int autofs_get_set_timeout(struct autofs_sb_info *sbi,
480 unsigned long __user *p)
481{
482 unsigned long ntimeout;
483
484 if (get_user(ntimeout, p) ||
485 put_user(sbi->exp_timeout / HZ, p))
486 return -EFAULT;
487
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700488 if (ntimeout > ULONG_MAX/HZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 sbi->exp_timeout = 0;
490 else
491 sbi->exp_timeout = ntimeout * HZ;
492
493 return 0;
494}
495
496/* Return protocol version */
497static inline int autofs_get_protover(int __user *p)
498{
499 return put_user(AUTOFS_PROTO_VERSION, p);
500}
501
502/* Perform an expiry operation */
503static inline int autofs_expire_run(struct super_block *sb,
504 struct autofs_sb_info *sbi,
505 struct vfsmount *mnt,
506 struct autofs_packet_expire __user *pkt_p)
507{
508 struct autofs_dir_ent *ent;
509 struct autofs_packet_expire pkt;
510
511 memset(&pkt,0,sizeof pkt);
512
513 pkt.hdr.proto_version = AUTOFS_PROTO_VERSION;
514 pkt.hdr.type = autofs_ptype_expire;
515
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700516 if (!sbi->exp_timeout || !(ent = autofs_expire(sb,sbi,mnt)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 return -EAGAIN;
518
519 pkt.len = ent->len;
520 memcpy(pkt.name, ent->name, pkt.len);
521 pkt.name[pkt.len] = '\0';
522
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700523 if (copy_to_user(pkt_p, &pkt, sizeof(struct autofs_packet_expire)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 return -EFAULT;
525
526 return 0;
527}
528
529/*
530 * ioctl()'s on the root directory is the chief method for the daemon to
531 * generate kernel reactions
532 */
533static int autofs_root_ioctl(struct inode *inode, struct file *filp,
534 unsigned int cmd, unsigned long arg)
535{
536 struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb);
537 void __user *argp = (void __user *)arg;
538
Pavel Emelianova47afb02007-10-18 23:39:46 -0700539 DPRINTK(("autofs_ioctl: cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u\n",cmd,arg,sbi,task_pgrp_nr(current)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700541 if (_IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) ||
542 _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 return -ENOTTY;
544
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700545 if (!autofs_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 return -EPERM;
547
548 switch(cmd) {
549 case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */
550 return autofs_wait_release(sbi,(autofs_wqt_t)arg,0);
551 case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */
552 return autofs_wait_release(sbi,(autofs_wqt_t)arg,-ENOENT);
553 case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */
554 autofs_catatonic_mode(sbi);
555 return 0;
556 case AUTOFS_IOC_PROTOVER: /* Get protocol version */
557 return autofs_get_protover(argp);
558 case AUTOFS_IOC_SETTIMEOUT:
559 return autofs_get_set_timeout(sbi, argp);
560 case AUTOFS_IOC_EXPIRE:
Josef "Jeff" Sipek81ed19b2006-12-08 02:36:46 -0800561 return autofs_expire_run(inode->i_sb, sbi, filp->f_path.mnt,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 argp);
563 default:
564 return -ENOSYS;
565 }
566}