1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
4 * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
5 * Copyright 2001-2006 Ian Kent <raven@themaw.net>
8 #include <linux/capability.h>
9 #include <linux/compat.h>
13 static int autofs_dir_symlink(struct inode
*, struct dentry
*, const char *);
14 static int autofs_dir_unlink(struct inode
*, struct dentry
*);
15 static int autofs_dir_rmdir(struct inode
*, struct dentry
*);
16 static int autofs_dir_mkdir(struct inode
*, struct dentry
*, umode_t
);
17 static long autofs_root_ioctl(struct file
*, unsigned int, unsigned long);
19 static long autofs_root_compat_ioctl(struct file
*,
20 unsigned int, unsigned long);
22 static int autofs_dir_open(struct inode
*inode
, struct file
*file
);
23 static struct dentry
*autofs_lookup(struct inode
*,
24 struct dentry
*, unsigned int);
25 static struct vfsmount
*autofs_d_automount(struct path
*);
26 static int autofs_d_manage(const struct path
*, bool);
27 static void autofs_dentry_release(struct dentry
*);
29 const struct file_operations autofs_root_operations
= {
30 .open
= dcache_dir_open
,
31 .release
= dcache_dir_close
,
32 .read
= generic_read_dir
,
33 .iterate_shared
= dcache_readdir
,
34 .llseek
= dcache_dir_lseek
,
35 .unlocked_ioctl
= autofs_root_ioctl
,
37 .compat_ioctl
= autofs_root_compat_ioctl
,
41 const struct file_operations autofs_dir_operations
= {
42 .open
= autofs_dir_open
,
43 .release
= dcache_dir_close
,
44 .read
= generic_read_dir
,
45 .iterate_shared
= dcache_readdir
,
46 .llseek
= dcache_dir_lseek
,
49 const struct inode_operations autofs_dir_inode_operations
= {
50 .lookup
= autofs_lookup
,
51 .unlink
= autofs_dir_unlink
,
52 .symlink
= autofs_dir_symlink
,
53 .mkdir
= autofs_dir_mkdir
,
54 .rmdir
= autofs_dir_rmdir
,
57 const struct dentry_operations autofs_dentry_operations
= {
58 .d_automount
= autofs_d_automount
,
59 .d_manage
= autofs_d_manage
,
60 .d_release
= autofs_dentry_release
,
63 static void autofs_del_active(struct dentry
*dentry
)
65 struct autofs_sb_info
*sbi
= autofs_sbi(dentry
->d_sb
);
66 struct autofs_info
*ino
;
68 ino
= autofs_dentry_ino(dentry
);
69 spin_lock(&sbi
->lookup_lock
);
70 list_del_init(&ino
->active
);
71 spin_unlock(&sbi
->lookup_lock
);
74 static int autofs_dir_open(struct inode
*inode
, struct file
*file
)
76 struct dentry
*dentry
= file
->f_path
.dentry
;
77 struct autofs_sb_info
*sbi
= autofs_sbi(dentry
->d_sb
);
79 pr_debug("file=%p dentry=%p %pd\n", file
, dentry
, dentry
);
81 if (autofs_oz_mode(sbi
))
85 * An empty directory in an autofs file system is always a
86 * mount point. The daemon must have failed to mount this
87 * during lookup so it doesn't exist. This can happen, for
88 * example, if user space returns an incorrect status for a
89 * mount request. Otherwise we're doing a readdir on the
90 * autofs file system so just let the libfs routines handle
93 spin_lock(&sbi
->lookup_lock
);
94 if (!path_is_mountpoint(&file
->f_path
) && simple_empty(dentry
)) {
95 spin_unlock(&sbi
->lookup_lock
);
98 spin_unlock(&sbi
->lookup_lock
);
101 return dcache_dir_open(inode
, file
);
104 static void autofs_dentry_release(struct dentry
*de
)
106 struct autofs_info
*ino
= autofs_dentry_ino(de
);
107 struct autofs_sb_info
*sbi
= autofs_sbi(de
->d_sb
);
109 pr_debug("releasing %p\n", de
);
115 spin_lock(&sbi
->lookup_lock
);
116 if (!list_empty(&ino
->active
))
117 list_del(&ino
->active
);
118 if (!list_empty(&ino
->expiring
))
119 list_del(&ino
->expiring
);
120 spin_unlock(&sbi
->lookup_lock
);
123 autofs_free_ino(ino
);
126 static struct dentry
*autofs_lookup_active(struct dentry
*dentry
)
128 struct autofs_sb_info
*sbi
= autofs_sbi(dentry
->d_sb
);
129 struct dentry
*parent
= dentry
->d_parent
;
130 const struct qstr
*name
= &dentry
->d_name
;
131 unsigned int len
= name
->len
;
132 unsigned int hash
= name
->hash
;
133 const unsigned char *str
= name
->name
;
134 struct list_head
*p
, *head
;
136 head
= &sbi
->active_list
;
137 if (list_empty(head
))
139 spin_lock(&sbi
->lookup_lock
);
140 list_for_each(p
, head
) {
141 struct autofs_info
*ino
;
142 struct dentry
*active
;
143 const struct qstr
*qstr
;
145 ino
= list_entry(p
, struct autofs_info
, active
);
146 active
= ino
->dentry
;
148 spin_lock(&active
->d_lock
);
151 if ((int) d_count(active
) <= 0)
154 qstr
= &active
->d_name
;
156 if (active
->d_name
.hash
!= hash
)
158 if (active
->d_parent
!= parent
)
161 if (qstr
->len
!= len
)
163 if (memcmp(qstr
->name
, str
, len
))
166 if (d_unhashed(active
)) {
168 spin_unlock(&active
->d_lock
);
169 spin_unlock(&sbi
->lookup_lock
);
173 spin_unlock(&active
->d_lock
);
175 spin_unlock(&sbi
->lookup_lock
);
180 static struct dentry
*autofs_lookup_expiring(struct dentry
*dentry
,
183 struct autofs_sb_info
*sbi
= autofs_sbi(dentry
->d_sb
);
184 struct dentry
*parent
= dentry
->d_parent
;
185 const struct qstr
*name
= &dentry
->d_name
;
186 unsigned int len
= name
->len
;
187 unsigned int hash
= name
->hash
;
188 const unsigned char *str
= name
->name
;
189 struct list_head
*p
, *head
;
191 head
= &sbi
->expiring_list
;
192 if (list_empty(head
))
194 spin_lock(&sbi
->lookup_lock
);
195 list_for_each(p
, head
) {
196 struct autofs_info
*ino
;
197 struct dentry
*expiring
;
198 const struct qstr
*qstr
;
201 spin_unlock(&sbi
->lookup_lock
);
202 return ERR_PTR(-ECHILD
);
205 ino
= list_entry(p
, struct autofs_info
, expiring
);
206 expiring
= ino
->dentry
;
208 spin_lock(&expiring
->d_lock
);
210 /* We've already been dentry_iput or unlinked */
211 if (d_really_is_negative(expiring
))
214 qstr
= &expiring
->d_name
;
216 if (expiring
->d_name
.hash
!= hash
)
218 if (expiring
->d_parent
!= parent
)
221 if (qstr
->len
!= len
)
223 if (memcmp(qstr
->name
, str
, len
))
226 if (d_unhashed(expiring
)) {
227 dget_dlock(expiring
);
228 spin_unlock(&expiring
->d_lock
);
229 spin_unlock(&sbi
->lookup_lock
);
233 spin_unlock(&expiring
->d_lock
);
235 spin_unlock(&sbi
->lookup_lock
);
240 static int autofs_mount_wait(const struct path
*path
, bool rcu_walk
)
242 struct autofs_sb_info
*sbi
= autofs_sbi(path
->dentry
->d_sb
);
243 struct autofs_info
*ino
= autofs_dentry_ino(path
->dentry
);
246 if (ino
->flags
& AUTOFS_INF_PENDING
) {
249 pr_debug("waiting for mount name=%pd\n", path
->dentry
);
250 status
= autofs_wait(sbi
, path
, NFY_MOUNT
);
251 pr_debug("mount wait done status=%d\n", status
);
252 ino
->last_used
= jiffies
;
255 if (!(sbi
->flags
& AUTOFS_SBI_STRICTEXPIRE
))
256 ino
->last_used
= jiffies
;
260 static int do_expire_wait(const struct path
*path
, bool rcu_walk
)
262 struct dentry
*dentry
= path
->dentry
;
263 struct dentry
*expiring
;
265 expiring
= autofs_lookup_expiring(dentry
, rcu_walk
);
266 if (IS_ERR(expiring
))
267 return PTR_ERR(expiring
);
269 return autofs_expire_wait(path
, rcu_walk
);
271 const struct path
this = { .mnt
= path
->mnt
, .dentry
= expiring
};
273 * If we are racing with expire the request might not
274 * be quite complete, but the directory has been removed
275 * so it must have been successful, just wait for it.
277 autofs_expire_wait(&this, 0);
278 autofs_del_expiring(expiring
);
284 static struct dentry
*autofs_mountpoint_changed(struct path
*path
)
286 struct dentry
*dentry
= path
->dentry
;
287 struct autofs_sb_info
*sbi
= autofs_sbi(dentry
->d_sb
);
290 * If this is an indirect mount the dentry could have gone away
291 * as a result of an expire and a new one created.
293 if (autofs_type_indirect(sbi
->type
) && d_unhashed(dentry
)) {
294 struct dentry
*parent
= dentry
->d_parent
;
295 struct autofs_info
*ino
;
298 new = d_lookup(parent
, &dentry
->d_name
);
301 ino
= autofs_dentry_ino(new);
302 ino
->last_used
= jiffies
;
309 static struct vfsmount
*autofs_d_automount(struct path
*path
)
311 struct dentry
*dentry
= path
->dentry
;
312 struct autofs_sb_info
*sbi
= autofs_sbi(dentry
->d_sb
);
313 struct autofs_info
*ino
= autofs_dentry_ino(dentry
);
316 pr_debug("dentry=%p %pd\n", dentry
, dentry
);
318 /* The daemon never triggers a mount. */
319 if (autofs_oz_mode(sbi
))
323 * If an expire request is pending everyone must wait.
324 * If the expire fails we're still mounted so continue
325 * the follow and return. A return of -EAGAIN (which only
326 * happens with indirect mounts) means the expire completed
327 * and the directory was removed, so just go ahead and try
330 status
= do_expire_wait(path
, 0);
331 if (status
&& status
!= -EAGAIN
)
334 /* Callback to the daemon to perform the mount or wait */
335 spin_lock(&sbi
->fs_lock
);
336 if (ino
->flags
& AUTOFS_INF_PENDING
) {
337 spin_unlock(&sbi
->fs_lock
);
338 status
= autofs_mount_wait(path
, 0);
340 return ERR_PTR(status
);
345 * If the dentry is a symlink it's equivalent to a directory
346 * having path_is_mountpoint() true, so there's no need to call
347 * back to the daemon.
349 if (d_really_is_positive(dentry
) && d_is_symlink(dentry
)) {
350 spin_unlock(&sbi
->fs_lock
);
354 if (!path_is_mountpoint(path
)) {
356 * It's possible that user space hasn't removed directories
357 * after umounting a rootless multi-mount, although it
358 * should. For v5 path_has_submounts() is sufficient to
359 * handle this because the leaves of the directory tree under
360 * the mount never trigger mounts themselves (they have an
361 * autofs trigger mount mounted on them). But v4 pseudo direct
362 * mounts do need the leaves to trigger mounts. In this case
363 * we have no choice but to use the list_empty() check and
364 * require user space behave.
366 if (sbi
->version
> 4) {
367 if (path_has_submounts(path
)) {
368 spin_unlock(&sbi
->fs_lock
);
372 if (!simple_empty(dentry
)) {
373 spin_unlock(&sbi
->fs_lock
);
377 ino
->flags
|= AUTOFS_INF_PENDING
;
378 spin_unlock(&sbi
->fs_lock
);
379 status
= autofs_mount_wait(path
, 0);
380 spin_lock(&sbi
->fs_lock
);
381 ino
->flags
&= ~AUTOFS_INF_PENDING
;
383 spin_unlock(&sbi
->fs_lock
);
384 return ERR_PTR(status
);
387 spin_unlock(&sbi
->fs_lock
);
389 /* Mount succeeded, check if we ended up with a new dentry */
390 dentry
= autofs_mountpoint_changed(path
);
392 return ERR_PTR(-ENOENT
);
397 static int autofs_d_manage(const struct path
*path
, bool rcu_walk
)
399 struct dentry
*dentry
= path
->dentry
;
400 struct autofs_sb_info
*sbi
= autofs_sbi(dentry
->d_sb
);
401 struct autofs_info
*ino
= autofs_dentry_ino(dentry
);
404 pr_debug("dentry=%p %pd\n", dentry
, dentry
);
406 /* The daemon never waits. */
407 if (autofs_oz_mode(sbi
)) {
408 if (!path_is_mountpoint(path
))
413 /* Wait for pending expires */
414 if (do_expire_wait(path
, rcu_walk
) == -ECHILD
)
418 * This dentry may be under construction so wait on mount
421 status
= autofs_mount_wait(path
, rcu_walk
);
426 /* We don't need fs_lock in rcu_walk mode,
427 * just testing 'AUTOFS_INFO_NO_RCU' is enough.
428 * simple_empty() takes a spinlock, so leave it
430 * We only return -EISDIR when certain this isn't
435 if (ino
->flags
& AUTOFS_INF_WANT_EXPIRE
)
437 if (path_is_mountpoint(path
))
439 inode
= d_inode_rcu(dentry
);
440 if (inode
&& S_ISLNK(inode
->i_mode
))
442 if (list_empty(&dentry
->d_subdirs
))
444 if (!simple_empty(dentry
))
449 spin_lock(&sbi
->fs_lock
);
451 * If the dentry has been selected for expire while we slept
452 * on the lock then it might go away. We'll deal with that in
453 * ->d_automount() and wait on a new mount if the expire
454 * succeeds or return here if it doesn't (since there's no
455 * mount to follow with a rootless multi-mount).
457 if (!(ino
->flags
& AUTOFS_INF_EXPIRING
)) {
459 * Any needed mounting has been completed and the path
460 * updated so check if this is a rootless multi-mount so
461 * we can avoid needless calls ->d_automount() and avoid
462 * an incorrect ELOOP error return.
464 if ((!path_is_mountpoint(path
) && !simple_empty(dentry
)) ||
465 (d_really_is_positive(dentry
) && d_is_symlink(dentry
)))
468 spin_unlock(&sbi
->fs_lock
);
473 /* Lookups in the root directory */
474 static struct dentry
*autofs_lookup(struct inode
*dir
,
475 struct dentry
*dentry
, unsigned int flags
)
477 struct autofs_sb_info
*sbi
;
478 struct autofs_info
*ino
;
479 struct dentry
*active
;
481 pr_debug("name = %pd\n", dentry
);
483 /* File name too long to exist */
484 if (dentry
->d_name
.len
> NAME_MAX
)
485 return ERR_PTR(-ENAMETOOLONG
);
487 sbi
= autofs_sbi(dir
->i_sb
);
489 pr_debug("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d\n",
490 current
->pid
, task_pgrp_nr(current
),
491 sbi
->flags
& AUTOFS_SBI_CATATONIC
,
492 autofs_oz_mode(sbi
));
494 active
= autofs_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 (!autofs_oz_mode(sbi
) && !IS_ROOT(dentry
->d_parent
))
505 return ERR_PTR(-ENOENT
);
507 ino
= autofs_new_ino(sbi
);
509 return ERR_PTR(-ENOMEM
);
511 spin_lock(&sbi
->lookup_lock
);
512 spin_lock(&dentry
->d_lock
);
513 /* Mark entries in the root as mount triggers */
514 if (IS_ROOT(dentry
->d_parent
) &&
515 autofs_type_indirect(sbi
->type
))
516 __managed_dentry_set_managed(dentry
);
517 dentry
->d_fsdata
= ino
;
518 ino
->dentry
= dentry
;
520 list_add(&ino
->active
, &sbi
->active_list
);
521 spin_unlock(&sbi
->lookup_lock
);
522 spin_unlock(&dentry
->d_lock
);
527 static int autofs_dir_symlink(struct inode
*dir
,
528 struct dentry
*dentry
,
531 struct autofs_sb_info
*sbi
= autofs_sbi(dir
->i_sb
);
532 struct autofs_info
*ino
= autofs_dentry_ino(dentry
);
533 struct autofs_info
*p_ino
;
535 size_t size
= strlen(symname
);
538 pr_debug("%s <- %pd\n", symname
, dentry
);
540 if (!autofs_oz_mode(sbi
))
543 /* autofs_oz_mode() needs to allow path walks when the
544 * autofs mount is catatonic but the state of an autofs
545 * file system needs to be preserved over restarts.
547 if (sbi
->flags
& AUTOFS_SBI_CATATONIC
)
552 autofs_clean_ino(ino
);
554 autofs_del_active(dentry
);
556 cp
= kmalloc(size
+ 1, GFP_KERNEL
);
562 inode
= autofs_get_inode(dir
->i_sb
, S_IFLNK
| 0555);
567 inode
->i_private
= cp
;
568 inode
->i_size
= size
;
569 d_add(dentry
, inode
);
572 atomic_inc(&ino
->count
);
573 p_ino
= autofs_dentry_ino(dentry
->d_parent
);
574 if (p_ino
&& !IS_ROOT(dentry
))
575 atomic_inc(&p_ino
->count
);
577 dir
->i_mtime
= current_time(dir
);
585 * Normal filesystems would do a "d_delete()" to tell the VFS dcache
586 * that the file no longer exists. However, doing that means that the
587 * VFS layer can turn the dentry into a negative dentry. We don't want
588 * this, because the unlink is probably the result of an expire.
589 * We simply d_drop it and add it to a expiring list in the super block,
590 * which allows the dentry lookup to check for an incomplete expire.
592 * If a process is blocked on the dentry waiting for the expire to finish,
593 * it will invalidate the dentry and try to mount with a new one.
595 * Also see autofs_dir_rmdir()..
597 static int autofs_dir_unlink(struct inode
*dir
, struct dentry
*dentry
)
599 struct autofs_sb_info
*sbi
= autofs_sbi(dir
->i_sb
);
600 struct autofs_info
*ino
= autofs_dentry_ino(dentry
);
601 struct autofs_info
*p_ino
;
603 if (!autofs_oz_mode(sbi
))
606 /* autofs_oz_mode() needs to allow path walks when the
607 * autofs mount is catatonic but the state of an autofs
608 * file system needs to be preserved over restarts.
610 if (sbi
->flags
& AUTOFS_SBI_CATATONIC
)
613 if (atomic_dec_and_test(&ino
->count
)) {
614 p_ino
= autofs_dentry_ino(dentry
->d_parent
);
615 if (p_ino
&& !IS_ROOT(dentry
))
616 atomic_dec(&p_ino
->count
);
620 d_inode(dentry
)->i_size
= 0;
621 clear_nlink(d_inode(dentry
));
623 dir
->i_mtime
= current_time(dir
);
625 spin_lock(&sbi
->lookup_lock
);
626 __autofs_add_expiring(dentry
);
628 spin_unlock(&sbi
->lookup_lock
);
634 * Version 4 of autofs provides a pseudo direct mount implementation
635 * that relies on directories at the leaves of a directory tree under
636 * an indirect mount to trigger mounts. To allow for this we need to
637 * set the DMANAGED_AUTOMOUNT and DMANAGED_TRANSIT flags on the leaves
638 * of the directory tree. There is no need to clear the automount flag
639 * following a mount or restore it after an expire because these mounts
640 * are always covered. However, it is necessary to ensure that these
641 * flags are clear on non-empty directories to avoid unnecessary calls
644 static void autofs_set_leaf_automount_flags(struct dentry
*dentry
)
646 struct dentry
*parent
;
648 /* root and dentrys in the root are already handled */
649 if (IS_ROOT(dentry
->d_parent
))
652 managed_dentry_set_managed(dentry
);
654 parent
= dentry
->d_parent
;
655 /* only consider parents below dentrys in the root */
656 if (IS_ROOT(parent
->d_parent
))
658 managed_dentry_clear_managed(parent
);
661 static void autofs_clear_leaf_automount_flags(struct dentry
*dentry
)
663 struct list_head
*d_child
;
664 struct dentry
*parent
;
666 /* flags for dentrys in the root are handled elsewhere */
667 if (IS_ROOT(dentry
->d_parent
))
670 managed_dentry_clear_managed(dentry
);
672 parent
= dentry
->d_parent
;
673 /* only consider parents below dentrys in the root */
674 if (IS_ROOT(parent
->d_parent
))
676 d_child
= &dentry
->d_child
;
677 /* Set parent managed if it's becoming empty */
678 if (d_child
->next
== &parent
->d_subdirs
&&
679 d_child
->prev
== &parent
->d_subdirs
)
680 managed_dentry_set_managed(parent
);
683 static int autofs_dir_rmdir(struct inode
*dir
, struct dentry
*dentry
)
685 struct autofs_sb_info
*sbi
= autofs_sbi(dir
->i_sb
);
686 struct autofs_info
*ino
= autofs_dentry_ino(dentry
);
687 struct autofs_info
*p_ino
;
689 pr_debug("dentry %p, removing %pd\n", dentry
, dentry
);
691 if (!autofs_oz_mode(sbi
))
694 /* autofs_oz_mode() needs to allow path walks when the
695 * autofs mount is catatonic but the state of an autofs
696 * file system needs to be preserved over restarts.
698 if (sbi
->flags
& AUTOFS_SBI_CATATONIC
)
701 spin_lock(&sbi
->lookup_lock
);
702 if (!simple_empty(dentry
)) {
703 spin_unlock(&sbi
->lookup_lock
);
706 __autofs_add_expiring(dentry
);
708 spin_unlock(&sbi
->lookup_lock
);
710 if (sbi
->version
< 5)
711 autofs_clear_leaf_automount_flags(dentry
);
713 if (atomic_dec_and_test(&ino
->count
)) {
714 p_ino
= autofs_dentry_ino(dentry
->d_parent
);
715 if (p_ino
&& dentry
->d_parent
!= dentry
)
716 atomic_dec(&p_ino
->count
);
719 d_inode(dentry
)->i_size
= 0;
720 clear_nlink(d_inode(dentry
));
728 static int autofs_dir_mkdir(struct inode
*dir
,
729 struct dentry
*dentry
, umode_t mode
)
731 struct autofs_sb_info
*sbi
= autofs_sbi(dir
->i_sb
);
732 struct autofs_info
*ino
= autofs_dentry_ino(dentry
);
733 struct autofs_info
*p_ino
;
736 if (!autofs_oz_mode(sbi
))
739 /* autofs_oz_mode() needs to allow path walks when the
740 * autofs mount is catatonic but the state of an autofs
741 * file system needs to be preserved over restarts.
743 if (sbi
->flags
& AUTOFS_SBI_CATATONIC
)
746 pr_debug("dentry %p, creating %pd\n", dentry
, dentry
);
750 autofs_clean_ino(ino
);
752 autofs_del_active(dentry
);
754 inode
= autofs_get_inode(dir
->i_sb
, S_IFDIR
| mode
);
757 d_add(dentry
, inode
);
759 if (sbi
->version
< 5)
760 autofs_set_leaf_automount_flags(dentry
);
763 atomic_inc(&ino
->count
);
764 p_ino
= autofs_dentry_ino(dentry
->d_parent
);
765 if (p_ino
&& !IS_ROOT(dentry
))
766 atomic_inc(&p_ino
->count
);
768 dir
->i_mtime
= current_time(dir
);
773 /* Get/set timeout ioctl() operation */
775 static inline int autofs_compat_get_set_timeout(struct autofs_sb_info
*sbi
,
776 compat_ulong_t __user
*p
)
778 unsigned long ntimeout
;
781 rv
= get_user(ntimeout
, p
);
785 rv
= put_user(sbi
->exp_timeout
/HZ
, p
);
789 if (ntimeout
> UINT_MAX
/HZ
)
790 sbi
->exp_timeout
= 0;
792 sbi
->exp_timeout
= ntimeout
* HZ
;
800 static inline int autofs_get_set_timeout(struct autofs_sb_info
*sbi
,
801 unsigned long __user
*p
)
803 unsigned long ntimeout
;
806 rv
= get_user(ntimeout
, p
);
810 rv
= put_user(sbi
->exp_timeout
/HZ
, p
);
814 if (ntimeout
> ULONG_MAX
/HZ
)
815 sbi
->exp_timeout
= 0;
817 sbi
->exp_timeout
= ntimeout
* HZ
;
824 /* Return protocol version */
825 static inline int autofs_get_protover(struct autofs_sb_info
*sbi
,
828 return put_user(sbi
->version
, p
);
831 /* Return protocol sub version */
832 static inline int autofs_get_protosubver(struct autofs_sb_info
*sbi
,
835 return put_user(sbi
->sub_version
, p
);
839 * Tells the daemon whether it can umount the autofs mount.
841 static inline int autofs_ask_umount(struct vfsmount
*mnt
, int __user
*p
)
848 pr_debug("may umount %d\n", status
);
850 status
= put_user(status
, p
);
855 /* Identify autofs_dentries - this is so we can tell if there's
856 * an extra dentry refcount or not. We only hold a refcount on the
857 * dentry if its non-negative (ie, d_inode != NULL)
859 int is_autofs_dentry(struct dentry
*dentry
)
861 return dentry
&& d_really_is_positive(dentry
) &&
862 dentry
->d_op
== &autofs_dentry_operations
&&
863 dentry
->d_fsdata
!= NULL
;
867 * ioctl()'s on the root directory is the chief method for the daemon to
868 * generate kernel reactions
870 static int autofs_root_ioctl_unlocked(struct inode
*inode
, struct file
*filp
,
871 unsigned int cmd
, unsigned long arg
)
873 struct autofs_sb_info
*sbi
= autofs_sbi(inode
->i_sb
);
874 void __user
*p
= (void __user
*)arg
;
876 pr_debug("cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u\n",
877 cmd
, arg
, sbi
, task_pgrp_nr(current
));
879 if (_IOC_TYPE(cmd
) != _IOC_TYPE(AUTOFS_IOC_FIRST
) ||
880 _IOC_NR(cmd
) - _IOC_NR(AUTOFS_IOC_FIRST
) >= AUTOFS_IOC_COUNT
)
883 if (!autofs_oz_mode(sbi
) && !capable(CAP_SYS_ADMIN
))
887 case AUTOFS_IOC_READY
: /* Wait queue: go ahead and retry */
888 return autofs_wait_release(sbi
, (autofs_wqt_t
) arg
, 0);
889 case AUTOFS_IOC_FAIL
: /* Wait queue: fail with ENOENT */
890 return autofs_wait_release(sbi
, (autofs_wqt_t
) arg
, -ENOENT
);
891 case AUTOFS_IOC_CATATONIC
: /* Enter catatonic mode (daemon shutdown) */
892 autofs_catatonic_mode(sbi
);
894 case AUTOFS_IOC_PROTOVER
: /* Get protocol version */
895 return autofs_get_protover(sbi
, p
);
896 case AUTOFS_IOC_PROTOSUBVER
: /* Get protocol sub version */
897 return autofs_get_protosubver(sbi
, p
);
898 case AUTOFS_IOC_SETTIMEOUT
:
899 return autofs_get_set_timeout(sbi
, p
);
901 case AUTOFS_IOC_SETTIMEOUT32
:
902 return autofs_compat_get_set_timeout(sbi
, p
);
905 case AUTOFS_IOC_ASKUMOUNT
:
906 return autofs_ask_umount(filp
->f_path
.mnt
, p
);
908 /* return a single thing to expire */
909 case AUTOFS_IOC_EXPIRE
:
910 return autofs_expire_run(inode
->i_sb
, filp
->f_path
.mnt
, sbi
, p
);
911 /* same as above, but can send multiple expires through pipe */
912 case AUTOFS_IOC_EXPIRE_MULTI
:
913 return autofs_expire_multi(inode
->i_sb
,
914 filp
->f_path
.mnt
, sbi
, p
);
921 static long autofs_root_ioctl(struct file
*filp
,
922 unsigned int cmd
, unsigned long arg
)
924 struct inode
*inode
= file_inode(filp
);
926 return autofs_root_ioctl_unlocked(inode
, filp
, cmd
, arg
);
930 static long autofs_root_compat_ioctl(struct file
*filp
,
931 unsigned int cmd
, unsigned long arg
)
933 struct inode
*inode
= file_inode(filp
);
936 if (cmd
== AUTOFS_IOC_READY
|| cmd
== AUTOFS_IOC_FAIL
)
937 ret
= autofs_root_ioctl_unlocked(inode
, filp
, cmd
, arg
);
939 ret
= autofs_root_ioctl_unlocked(inode
, filp
, cmd
,
940 (unsigned long) compat_ptr(arg
));