1 /* -*- c -*- --------------------------------------------------------------- *
3 * linux/fs/autofs/root.c
5 * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
6 * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
7 * Copyright 2001-2006 Ian Kent <raven@themaw.net>
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.
13 * ------------------------------------------------------------------------- */
15 #include <linux/capability.h>
16 #include <linux/errno.h>
17 #include <linux/stat.h>
18 #include <linux/slab.h>
19 #include <linux/param.h>
20 #include <linux/time.h>
21 #include <linux/compat.h>
22 #include <linux/mutex.h>
26 DEFINE_SPINLOCK(autofs4_lock
);
28 static int autofs4_dir_symlink(struct inode
*,struct dentry
*,const char *);
29 static int autofs4_dir_unlink(struct inode
*,struct dentry
*);
30 static int autofs4_dir_rmdir(struct inode
*,struct dentry
*);
31 static int autofs4_dir_mkdir(struct inode
*,struct dentry
*,int);
32 static long autofs4_root_ioctl(struct file
*,unsigned int,unsigned long);
34 static long autofs4_root_compat_ioctl(struct file
*,unsigned int,unsigned long);
36 static int autofs4_dir_open(struct inode
*inode
, struct file
*file
);
37 static struct dentry
*autofs4_lookup(struct inode
*,struct dentry
*, struct nameidata
*);
38 static struct vfsmount
*autofs4_d_automount(struct path
*);
39 static int autofs4_d_manage(struct dentry
*, bool, bool);
41 const struct file_operations autofs4_root_operations
= {
42 .open
= dcache_dir_open
,
43 .release
= dcache_dir_close
,
44 .read
= generic_read_dir
,
45 .readdir
= dcache_readdir
,
46 .llseek
= dcache_dir_lseek
,
47 .unlocked_ioctl
= autofs4_root_ioctl
,
49 .compat_ioctl
= autofs4_root_compat_ioctl
,
53 const struct file_operations autofs4_dir_operations
= {
54 .open
= autofs4_dir_open
,
55 .release
= dcache_dir_close
,
56 .read
= generic_read_dir
,
57 .readdir
= dcache_readdir
,
58 .llseek
= dcache_dir_lseek
,
61 const struct inode_operations autofs4_dir_inode_operations
= {
62 .lookup
= autofs4_lookup
,
63 .unlink
= autofs4_dir_unlink
,
64 .symlink
= autofs4_dir_symlink
,
65 .mkdir
= autofs4_dir_mkdir
,
66 .rmdir
= autofs4_dir_rmdir
,
69 const struct dentry_operations autofs4_dentry_operations
= {
70 .d_automount
= autofs4_d_automount
,
71 .d_manage
= autofs4_d_manage
,
72 .d_release
= autofs4_dentry_release
,
75 static void autofs4_add_active(struct dentry
*dentry
)
77 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
78 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
80 spin_lock(&sbi
->lookup_lock
);
81 if (!ino
->active_count
) {
82 if (list_empty(&ino
->active
))
83 list_add(&ino
->active
, &sbi
->active_list
);
86 spin_unlock(&sbi
->lookup_lock
);
91 static void autofs4_del_active(struct dentry
*dentry
)
93 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
94 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
96 spin_lock(&sbi
->lookup_lock
);
98 if (!ino
->active_count
) {
99 if (!list_empty(&ino
->active
))
100 list_del_init(&ino
->active
);
102 spin_unlock(&sbi
->lookup_lock
);
107 static int autofs4_dir_open(struct inode
*inode
, struct file
*file
)
109 struct dentry
*dentry
= file
->f_path
.dentry
;
110 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
112 DPRINTK("file=%p dentry=%p %.*s",
113 file
, dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
115 if (autofs4_oz_mode(sbi
))
119 * An empty directory in an autofs file system is always a
120 * mount point. The daemon must have failed to mount this
121 * during lookup so it doesn't exist. This can happen, for
122 * example, if user space returns an incorrect status for a
123 * mount request. Otherwise we're doing a readdir on the
124 * autofs file system so just let the libfs routines handle
127 spin_lock(&autofs4_lock
);
128 spin_lock(&dentry
->d_lock
);
129 if (!d_mountpoint(dentry
) && list_empty(&dentry
->d_subdirs
)) {
130 spin_unlock(&dentry
->d_lock
);
131 spin_unlock(&autofs4_lock
);
134 spin_unlock(&dentry
->d_lock
);
135 spin_unlock(&autofs4_lock
);
138 return dcache_dir_open(inode
, file
);
141 void autofs4_dentry_release(struct dentry
*de
)
143 struct autofs_info
*inf
;
145 DPRINTK("releasing %p", de
);
147 inf
= autofs4_dentry_ino(de
);
149 struct autofs_sb_info
*sbi
= autofs4_sbi(de
->d_sb
);
151 spin_lock(&sbi
->lookup_lock
);
152 if (!list_empty(&inf
->active
))
153 list_del(&inf
->active
);
154 if (!list_empty(&inf
->expiring
))
155 list_del(&inf
->expiring
);
156 spin_unlock(&sbi
->lookup_lock
);
158 autofs4_free_ino(inf
);
162 static struct dentry
*autofs4_lookup_active(struct dentry
*dentry
)
164 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
165 struct dentry
*parent
= dentry
->d_parent
;
166 struct qstr
*name
= &dentry
->d_name
;
167 unsigned int len
= name
->len
;
168 unsigned int hash
= name
->hash
;
169 const unsigned char *str
= name
->name
;
170 struct list_head
*p
, *head
;
172 spin_lock(&autofs4_lock
);
173 spin_lock(&sbi
->lookup_lock
);
174 head
= &sbi
->active_list
;
175 list_for_each(p
, head
) {
176 struct autofs_info
*ino
;
177 struct dentry
*active
;
180 ino
= list_entry(p
, struct autofs_info
, active
);
181 active
= ino
->dentry
;
183 spin_lock(&active
->d_lock
);
186 if (active
->d_count
== 0)
189 qstr
= &active
->d_name
;
191 if (active
->d_name
.hash
!= hash
)
193 if (active
->d_parent
!= parent
)
196 if (qstr
->len
!= len
)
198 if (memcmp(qstr
->name
, str
, len
))
201 if (d_unhashed(active
)) {
203 spin_unlock(&active
->d_lock
);
204 spin_unlock(&sbi
->lookup_lock
);
205 spin_unlock(&autofs4_lock
);
209 spin_unlock(&active
->d_lock
);
211 spin_unlock(&sbi
->lookup_lock
);
212 spin_unlock(&autofs4_lock
);
217 static struct dentry
*autofs4_lookup_expiring(struct dentry
*dentry
)
219 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
220 struct dentry
*parent
= dentry
->d_parent
;
221 struct qstr
*name
= &dentry
->d_name
;
222 unsigned int len
= name
->len
;
223 unsigned int hash
= name
->hash
;
224 const unsigned char *str
= name
->name
;
225 struct list_head
*p
, *head
;
227 spin_lock(&autofs4_lock
);
228 spin_lock(&sbi
->lookup_lock
);
229 head
= &sbi
->expiring_list
;
230 list_for_each(p
, head
) {
231 struct autofs_info
*ino
;
232 struct dentry
*expiring
;
235 ino
= list_entry(p
, struct autofs_info
, expiring
);
236 expiring
= ino
->dentry
;
238 spin_lock(&expiring
->d_lock
);
240 /* Bad luck, we've already been dentry_iput */
241 if (!expiring
->d_inode
)
244 qstr
= &expiring
->d_name
;
246 if (expiring
->d_name
.hash
!= hash
)
248 if (expiring
->d_parent
!= parent
)
251 if (qstr
->len
!= len
)
253 if (memcmp(qstr
->name
, str
, len
))
256 if (d_unhashed(expiring
)) {
257 dget_dlock(expiring
);
258 spin_unlock(&expiring
->d_lock
);
259 spin_unlock(&sbi
->lookup_lock
);
260 spin_unlock(&autofs4_lock
);
264 spin_unlock(&expiring
->d_lock
);
266 spin_unlock(&sbi
->lookup_lock
);
267 spin_unlock(&autofs4_lock
);
272 static int autofs4_mount_wait(struct dentry
*dentry
)
274 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
275 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
278 if (ino
->flags
& AUTOFS_INF_PENDING
) {
279 DPRINTK("waiting for mount name=%.*s",
280 dentry
->d_name
.len
, dentry
->d_name
.name
);
281 status
= autofs4_wait(sbi
, dentry
, NFY_MOUNT
);
282 DPRINTK("mount wait done status=%d", status
);
283 ino
->last_used
= jiffies
;
289 static int do_expire_wait(struct dentry
*dentry
)
291 struct dentry
*expiring
;
293 expiring
= autofs4_lookup_expiring(dentry
);
295 return autofs4_expire_wait(dentry
);
298 * If we are racing with expire the request might not
299 * be quite complete, but the directory has been removed
300 * so it must have been successful, just wait for it.
302 autofs4_expire_wait(expiring
);
303 autofs4_del_expiring(expiring
);
309 static struct dentry
*autofs4_mountpoint_changed(struct path
*path
)
311 struct dentry
*dentry
= path
->dentry
;
312 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
315 * If this is an indirect mount the dentry could have gone away
316 * as a result of an expire and a new one created.
318 if (autofs_type_indirect(sbi
->type
) && d_unhashed(dentry
)) {
319 struct dentry
*parent
= dentry
->d_parent
;
320 struct dentry
*new = d_lookup(parent
, &dentry
->d_name
);
329 static struct vfsmount
*autofs4_d_automount(struct path
*path
)
331 struct dentry
*dentry
= path
->dentry
;
332 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
333 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
336 DPRINTK("dentry=%p %.*s",
337 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
340 * Someone may have manually umounted this or it was a submount
341 * that has gone away.
343 spin_lock(&dentry
->d_lock
);
344 if (!d_mountpoint(dentry
) && list_empty(&dentry
->d_subdirs
)) {
345 if (!(dentry
->d_flags
& DCACHE_MANAGE_TRANSIT
) &&
346 (dentry
->d_flags
& DCACHE_NEED_AUTOMOUNT
))
347 __managed_dentry_set_transit(path
->dentry
);
349 spin_unlock(&dentry
->d_lock
);
351 /* The daemon never triggers a mount. */
352 if (autofs4_oz_mode(sbi
))
356 * If an expire request is pending everyone must wait.
357 * If the expire fails we're still mounted so continue
358 * the follow and return. A return of -EAGAIN (which only
359 * happens with indirect mounts) means the expire completed
360 * and the directory was removed, so just go ahead and try
363 status
= do_expire_wait(dentry
);
364 if (status
&& status
!= -EAGAIN
)
367 /* Callback to the daemon to perform the mount or wait */
368 spin_lock(&sbi
->fs_lock
);
369 if (ino
->flags
& AUTOFS_INF_PENDING
) {
370 spin_unlock(&sbi
->fs_lock
);
371 status
= autofs4_mount_wait(dentry
);
373 return ERR_PTR(status
);
374 spin_lock(&sbi
->fs_lock
);
379 * If the dentry is a symlink it's equivalent to a directory
380 * having d_mountpoint() true, so there's no need to call back
383 if (dentry
->d_inode
&& S_ISLNK(dentry
->d_inode
->i_mode
))
385 if (!d_mountpoint(dentry
)) {
387 * It's possible that user space hasn't removed directories
388 * after umounting a rootless multi-mount, although it
389 * should. For v5 have_submounts() is sufficient to handle
390 * this because the leaves of the directory tree under the
391 * mount never trigger mounts themselves (they have an autofs
392 * trigger mount mounted on them). But v4 pseudo direct mounts
393 * do need the leaves to to trigger mounts. In this case we
394 * have no choice but to use the list_empty() check and
395 * require user space behave.
397 if (sbi
->version
> 4) {
398 if (have_submounts(dentry
))
401 spin_lock(&dentry
->d_lock
);
402 if (!list_empty(&dentry
->d_subdirs
)) {
403 spin_unlock(&dentry
->d_lock
);
406 spin_unlock(&dentry
->d_lock
);
408 ino
->flags
|= AUTOFS_INF_PENDING
;
409 spin_unlock(&sbi
->fs_lock
);
410 status
= autofs4_mount_wait(dentry
);
412 return ERR_PTR(status
);
413 spin_lock(&sbi
->fs_lock
);
414 ino
->flags
&= ~AUTOFS_INF_PENDING
;
417 if (!(ino
->flags
& AUTOFS_INF_EXPIRING
)) {
419 * Any needed mounting has been completed and the path updated
420 * so turn this into a normal dentry so we don't continually
421 * call ->d_automount() and ->d_manage().
423 spin_lock(&dentry
->d_lock
);
424 __managed_dentry_clear_transit(dentry
);
426 * Only clear DMANAGED_AUTOMOUNT for rootless multi-mounts and
427 * symlinks as in all other cases the dentry will be covered by
428 * an actual mount so ->d_automount() won't be called during
431 if ((!d_mountpoint(dentry
) &&
432 !list_empty(&dentry
->d_subdirs
)) ||
433 (dentry
->d_inode
&& S_ISLNK(dentry
->d_inode
->i_mode
)))
434 __managed_dentry_clear_automount(dentry
);
435 spin_unlock(&dentry
->d_lock
);
437 spin_unlock(&sbi
->fs_lock
);
439 /* Mount succeeded, check if we ended up with a new dentry */
440 dentry
= autofs4_mountpoint_changed(path
);
442 return ERR_PTR(-ENOENT
);
447 int autofs4_d_manage(struct dentry
*dentry
, bool mounting_here
, bool rcu_walk
)
449 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
451 DPRINTK("dentry=%p %.*s",
452 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
454 /* The daemon never waits. */
455 if (autofs4_oz_mode(sbi
) || mounting_here
) {
456 if (!d_mountpoint(dentry
))
461 /* We need to sleep, so we need pathwalk to be in ref-mode */
465 /* Wait for pending expires */
466 do_expire_wait(dentry
);
469 * This dentry may be under construction so wait on mount
472 return autofs4_mount_wait(dentry
);
475 /* Lookups in the root directory */
476 static struct dentry
*autofs4_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
)
478 struct autofs_sb_info
*sbi
;
479 struct autofs_info
*ino
;
480 struct dentry
*active
;
482 DPRINTK("name = %.*s", dentry
->d_name
.len
, dentry
->d_name
.name
);
484 /* File name too long to exist */
485 if (dentry
->d_name
.len
> NAME_MAX
)
486 return ERR_PTR(-ENAMETOOLONG
);
488 sbi
= autofs4_sbi(dir
->i_sb
);
490 DPRINTK("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d",
491 current
->pid
, task_pgrp_nr(current
), sbi
->catatonic
,
492 autofs4_oz_mode(sbi
));
494 active
= autofs4_lookup_active(dentry
);
499 * A dentry that is not within the root can never trigger a
500 * mount operation, unless the directory already exists, so we
501 * can return fail immediately. The daemon however does need
502 * to create directories within the file system.
504 if (!autofs4_oz_mode(sbi
) && !IS_ROOT(dentry
->d_parent
))
505 return ERR_PTR(-ENOENT
);
507 /* Mark entries in the root as mount triggers */
508 if (autofs_type_indirect(sbi
->type
) && IS_ROOT(dentry
->d_parent
))
509 __managed_dentry_set_managed(dentry
);
511 ino
= autofs4_init_ino(NULL
, sbi
, 0555);
513 return ERR_PTR(-ENOMEM
);
515 dentry
->d_fsdata
= ino
;
516 ino
->dentry
= dentry
;
518 autofs4_add_active(dentry
);
520 d_instantiate(dentry
, NULL
);
525 static int autofs4_dir_symlink(struct inode
*dir
,
526 struct dentry
*dentry
,
529 struct autofs_sb_info
*sbi
= autofs4_sbi(dir
->i_sb
);
530 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
531 struct autofs_info
*p_ino
;
535 DPRINTK("%s <- %.*s", symname
,
536 dentry
->d_name
.len
, dentry
->d_name
.name
);
538 if (!autofs4_oz_mode(sbi
))
541 ino
= autofs4_init_ino(ino
, sbi
, S_IFLNK
| 0555);
545 autofs4_del_active(dentry
);
547 ino
->size
= strlen(symname
);
548 cp
= kmalloc(ino
->size
+ 1, GFP_KERNEL
);
550 if (!dentry
->d_fsdata
)
557 inode
= autofs4_get_inode(dir
->i_sb
, ino
);
560 if (!dentry
->d_fsdata
)
564 d_add(dentry
, inode
);
566 dentry
->d_fsdata
= ino
;
567 ino
->dentry
= dget(dentry
);
568 atomic_inc(&ino
->count
);
569 p_ino
= autofs4_dentry_ino(dentry
->d_parent
);
570 if (p_ino
&& dentry
->d_parent
!= dentry
)
571 atomic_inc(&p_ino
->count
);
574 dir
->i_mtime
= CURRENT_TIME
;
582 * Normal filesystems would do a "d_delete()" to tell the VFS dcache
583 * that the file no longer exists. However, doing that means that the
584 * VFS layer can turn the dentry into a negative dentry. We don't want
585 * this, because the unlink is probably the result of an expire.
586 * We simply d_drop it and add it to a expiring list in the super block,
587 * which allows the dentry lookup to check for an incomplete expire.
589 * If a process is blocked on the dentry waiting for the expire to finish,
590 * it will invalidate the dentry and try to mount with a new one.
592 * Also see autofs4_dir_rmdir()..
594 static int autofs4_dir_unlink(struct inode
*dir
, struct dentry
*dentry
)
596 struct autofs_sb_info
*sbi
= autofs4_sbi(dir
->i_sb
);
597 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
598 struct autofs_info
*p_ino
;
600 /* This allows root to remove symlinks */
601 if (!autofs4_oz_mode(sbi
) && !capable(CAP_SYS_ADMIN
))
604 if (atomic_dec_and_test(&ino
->count
)) {
605 p_ino
= autofs4_dentry_ino(dentry
->d_parent
);
606 if (p_ino
&& dentry
->d_parent
!= dentry
)
607 atomic_dec(&p_ino
->count
);
611 dentry
->d_inode
->i_size
= 0;
612 clear_nlink(dentry
->d_inode
);
614 dir
->i_mtime
= CURRENT_TIME
;
616 spin_lock(&autofs4_lock
);
617 autofs4_add_expiring(dentry
);
618 spin_lock(&dentry
->d_lock
);
620 spin_unlock(&dentry
->d_lock
);
621 spin_unlock(&autofs4_lock
);
627 * Version 4 of autofs provides a pseudo direct mount implementation
628 * that relies on directories at the leaves of a directory tree under
629 * an indirect mount to trigger mounts. To allow for this we need to
630 * set the DMANAGED_AUTOMOUNT and DMANAGED_TRANSIT flags on the leaves
631 * of the directory tree. There is no need to clear the automount flag
632 * following a mount or restore it after an expire because these mounts
633 * are always covered. However, it is neccessary to ensure that these
634 * flags are clear on non-empty directories to avoid unnecessary calls
637 static void autofs_set_leaf_automount_flags(struct dentry
*dentry
)
639 struct dentry
*parent
;
641 /* root and dentrys in the root are already handled */
642 if (IS_ROOT(dentry
->d_parent
))
645 managed_dentry_set_managed(dentry
);
647 parent
= dentry
->d_parent
;
648 /* only consider parents below dentrys in the root */
649 if (IS_ROOT(parent
->d_parent
))
651 managed_dentry_clear_managed(parent
);
655 static void autofs_clear_leaf_automount_flags(struct dentry
*dentry
)
657 struct list_head
*d_child
;
658 struct dentry
*parent
;
660 /* flags for dentrys in the root are handled elsewhere */
661 if (IS_ROOT(dentry
->d_parent
))
664 managed_dentry_clear_managed(dentry
);
666 parent
= dentry
->d_parent
;
667 /* only consider parents below dentrys in the root */
668 if (IS_ROOT(parent
->d_parent
))
670 d_child
= &dentry
->d_u
.d_child
;
671 /* Set parent managed if it's becoming empty */
672 if (d_child
->next
== &parent
->d_subdirs
&&
673 d_child
->prev
== &parent
->d_subdirs
)
674 managed_dentry_set_managed(parent
);
678 static int autofs4_dir_rmdir(struct inode
*dir
, struct dentry
*dentry
)
680 struct autofs_sb_info
*sbi
= autofs4_sbi(dir
->i_sb
);
681 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
682 struct autofs_info
*p_ino
;
684 DPRINTK("dentry %p, removing %.*s",
685 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
687 if (!autofs4_oz_mode(sbi
))
690 spin_lock(&autofs4_lock
);
691 spin_lock(&sbi
->lookup_lock
);
692 spin_lock(&dentry
->d_lock
);
693 if (!list_empty(&dentry
->d_subdirs
)) {
694 spin_unlock(&dentry
->d_lock
);
695 spin_unlock(&sbi
->lookup_lock
);
696 spin_unlock(&autofs4_lock
);
699 __autofs4_add_expiring(dentry
);
700 spin_unlock(&sbi
->lookup_lock
);
702 spin_unlock(&dentry
->d_lock
);
703 spin_unlock(&autofs4_lock
);
705 if (sbi
->version
< 5)
706 autofs_clear_leaf_automount_flags(dentry
);
708 if (atomic_dec_and_test(&ino
->count
)) {
709 p_ino
= autofs4_dentry_ino(dentry
->d_parent
);
710 if (p_ino
&& dentry
->d_parent
!= dentry
)
711 atomic_dec(&p_ino
->count
);
714 dentry
->d_inode
->i_size
= 0;
715 clear_nlink(dentry
->d_inode
);
723 static int autofs4_dir_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
725 struct autofs_sb_info
*sbi
= autofs4_sbi(dir
->i_sb
);
726 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
727 struct autofs_info
*p_ino
;
730 if (!autofs4_oz_mode(sbi
))
733 DPRINTK("dentry %p, creating %.*s",
734 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
736 ino
= autofs4_init_ino(ino
, sbi
, S_IFDIR
| 0555);
740 autofs4_del_active(dentry
);
742 inode
= autofs4_get_inode(dir
->i_sb
, ino
);
744 if (!dentry
->d_fsdata
)
748 d_add(dentry
, inode
);
750 if (sbi
->version
< 5)
751 autofs_set_leaf_automount_flags(dentry
);
753 dentry
->d_fsdata
= ino
;
754 ino
->dentry
= dget(dentry
);
755 atomic_inc(&ino
->count
);
756 p_ino
= autofs4_dentry_ino(dentry
->d_parent
);
757 if (p_ino
&& dentry
->d_parent
!= dentry
)
758 atomic_inc(&p_ino
->count
);
760 dir
->i_mtime
= CURRENT_TIME
;
765 /* Get/set timeout ioctl() operation */
767 static inline int autofs4_compat_get_set_timeout(struct autofs_sb_info
*sbi
,
768 compat_ulong_t __user
*p
)
771 unsigned long ntimeout
;
773 if ((rv
= get_user(ntimeout
, p
)) ||
774 (rv
= put_user(sbi
->exp_timeout
/HZ
, p
)))
777 if (ntimeout
> UINT_MAX
/HZ
)
778 sbi
->exp_timeout
= 0;
780 sbi
->exp_timeout
= ntimeout
* HZ
;
786 static inline int autofs4_get_set_timeout(struct autofs_sb_info
*sbi
,
787 unsigned long __user
*p
)
790 unsigned long ntimeout
;
792 if ((rv
= get_user(ntimeout
, p
)) ||
793 (rv
= put_user(sbi
->exp_timeout
/HZ
, p
)))
796 if (ntimeout
> ULONG_MAX
/HZ
)
797 sbi
->exp_timeout
= 0;
799 sbi
->exp_timeout
= ntimeout
* HZ
;
804 /* Return protocol version */
805 static inline int autofs4_get_protover(struct autofs_sb_info
*sbi
, int __user
*p
)
807 return put_user(sbi
->version
, p
);
810 /* Return protocol sub version */
811 static inline int autofs4_get_protosubver(struct autofs_sb_info
*sbi
, int __user
*p
)
813 return put_user(sbi
->sub_version
, p
);
817 * Tells the daemon whether it can umount the autofs mount.
819 static inline int autofs4_ask_umount(struct vfsmount
*mnt
, int __user
*p
)
826 DPRINTK("returning %d", status
);
828 status
= put_user(status
, p
);
833 /* Identify autofs4_dentries - this is so we can tell if there's
834 an extra dentry refcount or not. We only hold a refcount on the
835 dentry if its non-negative (ie, d_inode != NULL)
837 int is_autofs4_dentry(struct dentry
*dentry
)
839 return dentry
&& dentry
->d_inode
&&
840 dentry
->d_op
== &autofs4_dentry_operations
&&
841 dentry
->d_fsdata
!= NULL
;
845 * ioctl()'s on the root directory is the chief method for the daemon to
846 * generate kernel reactions
848 static int autofs4_root_ioctl_unlocked(struct inode
*inode
, struct file
*filp
,
849 unsigned int cmd
, unsigned long arg
)
851 struct autofs_sb_info
*sbi
= autofs4_sbi(inode
->i_sb
);
852 void __user
*p
= (void __user
*)arg
;
854 DPRINTK("cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u",
855 cmd
,arg
,sbi
,task_pgrp_nr(current
));
857 if (_IOC_TYPE(cmd
) != _IOC_TYPE(AUTOFS_IOC_FIRST
) ||
858 _IOC_NR(cmd
) - _IOC_NR(AUTOFS_IOC_FIRST
) >= AUTOFS_IOC_COUNT
)
861 if (!autofs4_oz_mode(sbi
) && !capable(CAP_SYS_ADMIN
))
865 case AUTOFS_IOC_READY
: /* Wait queue: go ahead and retry */
866 return autofs4_wait_release(sbi
,(autofs_wqt_t
)arg
,0);
867 case AUTOFS_IOC_FAIL
: /* Wait queue: fail with ENOENT */
868 return autofs4_wait_release(sbi
,(autofs_wqt_t
)arg
,-ENOENT
);
869 case AUTOFS_IOC_CATATONIC
: /* Enter catatonic mode (daemon shutdown) */
870 autofs4_catatonic_mode(sbi
);
872 case AUTOFS_IOC_PROTOVER
: /* Get protocol version */
873 return autofs4_get_protover(sbi
, p
);
874 case AUTOFS_IOC_PROTOSUBVER
: /* Get protocol sub version */
875 return autofs4_get_protosubver(sbi
, p
);
876 case AUTOFS_IOC_SETTIMEOUT
:
877 return autofs4_get_set_timeout(sbi
, p
);
879 case AUTOFS_IOC_SETTIMEOUT32
:
880 return autofs4_compat_get_set_timeout(sbi
, p
);
883 case AUTOFS_IOC_ASKUMOUNT
:
884 return autofs4_ask_umount(filp
->f_path
.mnt
, p
);
886 /* return a single thing to expire */
887 case AUTOFS_IOC_EXPIRE
:
888 return autofs4_expire_run(inode
->i_sb
,filp
->f_path
.mnt
,sbi
, p
);
889 /* same as above, but can send multiple expires through pipe */
890 case AUTOFS_IOC_EXPIRE_MULTI
:
891 return autofs4_expire_multi(inode
->i_sb
,filp
->f_path
.mnt
,sbi
, p
);
898 static long autofs4_root_ioctl(struct file
*filp
,
899 unsigned int cmd
, unsigned long arg
)
901 struct inode
*inode
= filp
->f_dentry
->d_inode
;
902 return autofs4_root_ioctl_unlocked(inode
, filp
, cmd
, arg
);
906 static long autofs4_root_compat_ioctl(struct file
*filp
,
907 unsigned int cmd
, unsigned long arg
)
909 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
912 if (cmd
== AUTOFS_IOC_READY
|| cmd
== AUTOFS_IOC_FAIL
)
913 ret
= autofs4_root_ioctl_unlocked(inode
, filp
, cmd
, arg
);
915 ret
= autofs4_root_ioctl_unlocked(inode
, filp
, cmd
,
916 (unsigned long)compat_ptr(arg
));