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);
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 /* For dentries that don't initiate mounting */
70 const struct dentry_operations autofs4_dentry_operations
= {
71 .d_release
= autofs4_dentry_release
,
74 /* For dentries that do initiate mounting */
75 const struct dentry_operations autofs4_mount_dentry_operations
= {
76 .d_automount
= autofs4_d_automount
,
77 .d_manage
= autofs4_d_manage
,
78 .d_release
= autofs4_dentry_release
,
81 static void autofs4_add_active(struct dentry
*dentry
)
83 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
84 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
86 spin_lock(&sbi
->lookup_lock
);
87 if (!ino
->active_count
) {
88 if (list_empty(&ino
->active
))
89 list_add(&ino
->active
, &sbi
->active_list
);
92 spin_unlock(&sbi
->lookup_lock
);
97 static void autofs4_del_active(struct dentry
*dentry
)
99 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
100 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
102 spin_lock(&sbi
->lookup_lock
);
104 if (!ino
->active_count
) {
105 if (!list_empty(&ino
->active
))
106 list_del_init(&ino
->active
);
108 spin_unlock(&sbi
->lookup_lock
);
113 static int autofs4_dir_open(struct inode
*inode
, struct file
*file
)
115 struct dentry
*dentry
= file
->f_path
.dentry
;
116 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
118 DPRINTK("file=%p dentry=%p %.*s",
119 file
, dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
121 if (autofs4_oz_mode(sbi
))
125 * An empty directory in an autofs file system is always a
126 * mount point. The daemon must have failed to mount this
127 * during lookup so it doesn't exist. This can happen, for
128 * example, if user space returns an incorrect status for a
129 * mount request. Otherwise we're doing a readdir on the
130 * autofs file system so just let the libfs routines handle
133 spin_lock(&autofs4_lock
);
134 spin_lock(&dentry
->d_lock
);
135 if (!d_mountpoint(dentry
) && list_empty(&dentry
->d_subdirs
)) {
136 spin_unlock(&dentry
->d_lock
);
137 spin_unlock(&autofs4_lock
);
140 spin_unlock(&dentry
->d_lock
);
141 spin_unlock(&autofs4_lock
);
144 return dcache_dir_open(inode
, file
);
147 void autofs4_dentry_release(struct dentry
*de
)
149 struct autofs_info
*inf
;
151 DPRINTK("releasing %p", de
);
153 inf
= autofs4_dentry_ino(de
);
155 struct autofs_sb_info
*sbi
= autofs4_sbi(de
->d_sb
);
157 spin_lock(&sbi
->lookup_lock
);
158 if (!list_empty(&inf
->active
))
159 list_del(&inf
->active
);
160 if (!list_empty(&inf
->expiring
))
161 list_del(&inf
->expiring
);
162 spin_unlock(&sbi
->lookup_lock
);
164 autofs4_free_ino(inf
);
168 static struct dentry
*autofs4_lookup_active(struct dentry
*dentry
)
170 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
171 struct dentry
*parent
= dentry
->d_parent
;
172 struct qstr
*name
= &dentry
->d_name
;
173 unsigned int len
= name
->len
;
174 unsigned int hash
= name
->hash
;
175 const unsigned char *str
= name
->name
;
176 struct list_head
*p
, *head
;
178 spin_lock(&autofs4_lock
);
179 spin_lock(&sbi
->lookup_lock
);
180 head
= &sbi
->active_list
;
181 list_for_each(p
, head
) {
182 struct autofs_info
*ino
;
183 struct dentry
*active
;
186 ino
= list_entry(p
, struct autofs_info
, active
);
187 active
= ino
->dentry
;
189 spin_lock(&active
->d_lock
);
192 if (active
->d_count
== 0)
195 qstr
= &active
->d_name
;
197 if (active
->d_name
.hash
!= hash
)
199 if (active
->d_parent
!= parent
)
202 if (qstr
->len
!= len
)
204 if (memcmp(qstr
->name
, str
, len
))
207 if (d_unhashed(active
)) {
209 spin_unlock(&active
->d_lock
);
210 spin_unlock(&sbi
->lookup_lock
);
211 spin_unlock(&autofs4_lock
);
215 spin_unlock(&active
->d_lock
);
217 spin_unlock(&sbi
->lookup_lock
);
218 spin_unlock(&autofs4_lock
);
223 static struct dentry
*autofs4_lookup_expiring(struct dentry
*dentry
)
225 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
226 struct dentry
*parent
= dentry
->d_parent
;
227 struct qstr
*name
= &dentry
->d_name
;
228 unsigned int len
= name
->len
;
229 unsigned int hash
= name
->hash
;
230 const unsigned char *str
= name
->name
;
231 struct list_head
*p
, *head
;
233 spin_lock(&autofs4_lock
);
234 spin_lock(&sbi
->lookup_lock
);
235 head
= &sbi
->expiring_list
;
236 list_for_each(p
, head
) {
237 struct autofs_info
*ino
;
238 struct dentry
*expiring
;
241 ino
= list_entry(p
, struct autofs_info
, expiring
);
242 expiring
= ino
->dentry
;
244 spin_lock(&expiring
->d_lock
);
246 /* Bad luck, we've already been dentry_iput */
247 if (!expiring
->d_inode
)
250 qstr
= &expiring
->d_name
;
252 if (expiring
->d_name
.hash
!= hash
)
254 if (expiring
->d_parent
!= parent
)
257 if (qstr
->len
!= len
)
259 if (memcmp(qstr
->name
, str
, len
))
262 if (d_unhashed(expiring
)) {
263 dget_dlock(expiring
);
264 spin_unlock(&expiring
->d_lock
);
265 spin_unlock(&sbi
->lookup_lock
);
266 spin_unlock(&autofs4_lock
);
270 spin_unlock(&expiring
->d_lock
);
272 spin_unlock(&sbi
->lookup_lock
);
273 spin_unlock(&autofs4_lock
);
278 static int autofs4_mount_wait(struct dentry
*dentry
)
280 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
281 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
284 if (ino
->flags
& AUTOFS_INF_PENDING
) {
285 DPRINTK("waiting for mount name=%.*s",
286 dentry
->d_name
.len
, dentry
->d_name
.name
);
287 status
= autofs4_wait(sbi
, dentry
, NFY_MOUNT
);
288 DPRINTK("mount wait done status=%d", status
);
289 ino
->last_used
= jiffies
;
295 static int do_expire_wait(struct dentry
*dentry
)
297 struct dentry
*expiring
;
299 expiring
= autofs4_lookup_expiring(dentry
);
301 return autofs4_expire_wait(dentry
);
304 * If we are racing with expire the request might not
305 * be quite complete, but the directory has been removed
306 * so it must have been successful, just wait for it.
308 autofs4_expire_wait(expiring
);
309 autofs4_del_expiring(expiring
);
315 static struct dentry
*autofs4_mountpoint_changed(struct path
*path
)
317 struct dentry
*dentry
= path
->dentry
;
318 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
321 * If this is an indirect mount the dentry could have gone away
322 * as a result of an expire and a new one created.
324 if (autofs_type_indirect(sbi
->type
) && d_unhashed(dentry
)) {
325 struct dentry
*parent
= dentry
->d_parent
;
326 struct dentry
*new = d_lookup(parent
, &dentry
->d_name
);
335 static struct vfsmount
*autofs4_d_automount(struct path
*path
)
337 struct dentry
*dentry
= path
->dentry
;
338 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
339 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
342 DPRINTK("dentry=%p %.*s",
343 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
346 * Someone may have manually umounted this or it was a submount
347 * that has gone away.
349 spin_lock(&dentry
->d_lock
);
350 if (!d_mountpoint(dentry
) && list_empty(&dentry
->d_subdirs
)) {
351 if (!(dentry
->d_flags
& DCACHE_MANAGE_TRANSIT
) &&
352 (dentry
->d_flags
& DCACHE_NEED_AUTOMOUNT
))
353 __managed_dentry_set_transit(path
->dentry
);
355 spin_unlock(&dentry
->d_lock
);
357 /* The daemon never triggers a mount. */
358 if (autofs4_oz_mode(sbi
))
362 * If an expire request is pending everyone must wait.
363 * If the expire fails we're still mounted so continue
364 * the follow and return. A return of -EAGAIN (which only
365 * happens with indirect mounts) means the expire completed
366 * and the directory was removed, so just go ahead and try
369 status
= do_expire_wait(dentry
);
370 if (status
&& status
!= -EAGAIN
)
373 /* Callback to the daemon to perform the mount or wait */
374 spin_lock(&sbi
->fs_lock
);
375 if (ino
->flags
& AUTOFS_INF_PENDING
) {
376 spin_unlock(&sbi
->fs_lock
);
377 status
= autofs4_mount_wait(dentry
);
379 return ERR_PTR(status
);
380 spin_lock(&sbi
->fs_lock
);
385 * If the dentry is a symlink it's equivalent to a directory
386 * having d_mountpoint() true, so there's no need to call back
389 if (dentry
->d_inode
&& S_ISLNK(dentry
->d_inode
->i_mode
))
391 if (!d_mountpoint(dentry
)) {
393 * It's possible that user space hasn't removed directories
394 * after umounting a rootless multi-mount, although it
395 * should. For v5 have_submounts() is sufficient to handle
396 * this because the leaves of the directory tree under the
397 * mount never trigger mounts themselves (they have an autofs
398 * trigger mount mounted on them). But v4 pseudo direct mounts
399 * do need the leaves to to trigger mounts. In this case we
400 * have no choice but to use the list_empty() check and
401 * require user space behave.
403 if (sbi
->version
> 4) {
404 if (have_submounts(dentry
))
407 spin_lock(&dentry
->d_lock
);
408 if (!list_empty(&dentry
->d_subdirs
)) {
409 spin_unlock(&dentry
->d_lock
);
412 spin_unlock(&dentry
->d_lock
);
414 ino
->flags
|= AUTOFS_INF_PENDING
;
415 spin_unlock(&sbi
->fs_lock
);
416 status
= autofs4_mount_wait(dentry
);
418 return ERR_PTR(status
);
419 spin_lock(&sbi
->fs_lock
);
420 ino
->flags
&= ~AUTOFS_INF_PENDING
;
423 if (!(ino
->flags
& AUTOFS_INF_EXPIRING
)) {
425 * Any needed mounting has been completed and the path updated
426 * so turn this into a normal dentry so we don't continually
427 * call ->d_automount() and ->d_manage().
429 spin_lock(&dentry
->d_lock
);
430 __managed_dentry_clear_transit(dentry
);
432 * Only clear DMANAGED_AUTOMOUNT for rootless multi-mounts and
433 * symlinks as in all other cases the dentry will be covered by
434 * an actual mount so ->d_automount() won't be called during
437 if ((!d_mountpoint(dentry
) &&
438 !list_empty(&dentry
->d_subdirs
)) ||
439 (dentry
->d_inode
&& S_ISLNK(dentry
->d_inode
->i_mode
)))
440 __managed_dentry_clear_automount(dentry
);
441 spin_unlock(&dentry
->d_lock
);
443 spin_unlock(&sbi
->fs_lock
);
445 /* Mount succeeded, check if we ended up with a new dentry */
446 dentry
= autofs4_mountpoint_changed(path
);
448 return ERR_PTR(-ENOENT
);
453 int autofs4_d_manage(struct dentry
*dentry
, bool mounting_here
)
455 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
457 DPRINTK("dentry=%p %.*s",
458 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
460 /* The daemon never waits. */
461 if (autofs4_oz_mode(sbi
) || mounting_here
) {
462 if (!d_mountpoint(dentry
))
467 /* Wait for pending expires */
468 do_expire_wait(dentry
);
471 * This dentry may be under construction so wait on mount
474 return autofs4_mount_wait(dentry
);
477 /* Lookups in the root directory */
478 static struct dentry
*autofs4_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
)
480 struct autofs_sb_info
*sbi
;
481 struct autofs_info
*ino
;
482 struct dentry
*active
;
484 DPRINTK("name = %.*s", dentry
->d_name
.len
, dentry
->d_name
.name
);
486 /* File name too long to exist */
487 if (dentry
->d_name
.len
> NAME_MAX
)
488 return ERR_PTR(-ENAMETOOLONG
);
490 sbi
= autofs4_sbi(dir
->i_sb
);
492 DPRINTK("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d",
493 current
->pid
, task_pgrp_nr(current
), sbi
->catatonic
, oz_mode
);
495 active
= autofs4_lookup_active(dentry
);
499 d_set_d_op(dentry
, &autofs4_dentry_operations
);
502 * A dentry that is not within the root can never trigger a
503 * mount operation, unless the directory already exists, so we
504 * can return fail immediately. The daemon however does need
505 * to create directories within the file system.
507 if (!autofs4_oz_mode(sbi
) && !IS_ROOT(dentry
->d_parent
))
508 return ERR_PTR(-ENOENT
);
510 /* Mark entries in the root as mount triggers */
511 if (autofs_type_indirect(sbi
->type
) && IS_ROOT(dentry
->d_parent
)) {
512 d_set_d_op(dentry
, &autofs4_mount_dentry_operations
);
513 __managed_dentry_set_managed(dentry
);
516 ino
= autofs4_init_ino(NULL
, sbi
, 0555);
518 return ERR_PTR(-ENOMEM
);
520 dentry
->d_fsdata
= ino
;
521 ino
->dentry
= dentry
;
523 autofs4_add_active(dentry
);
525 d_instantiate(dentry
, NULL
);
530 static int autofs4_dir_symlink(struct inode
*dir
,
531 struct dentry
*dentry
,
534 struct autofs_sb_info
*sbi
= autofs4_sbi(dir
->i_sb
);
535 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
536 struct autofs_info
*p_ino
;
540 DPRINTK("%s <- %.*s", symname
,
541 dentry
->d_name
.len
, dentry
->d_name
.name
);
543 if (!autofs4_oz_mode(sbi
))
546 ino
= autofs4_init_ino(ino
, sbi
, S_IFLNK
| 0555);
550 autofs4_del_active(dentry
);
552 ino
->size
= strlen(symname
);
553 cp
= kmalloc(ino
->size
+ 1, GFP_KERNEL
);
555 if (!dentry
->d_fsdata
)
562 inode
= autofs4_get_inode(dir
->i_sb
, ino
);
565 if (!dentry
->d_fsdata
)
569 d_add(dentry
, inode
);
571 d_set_d_op(dentry
, &autofs4_dentry_operations
);
573 dentry
->d_fsdata
= ino
;
574 ino
->dentry
= dget(dentry
);
575 atomic_inc(&ino
->count
);
576 p_ino
= autofs4_dentry_ino(dentry
->d_parent
);
577 if (p_ino
&& dentry
->d_parent
!= dentry
)
578 atomic_inc(&p_ino
->count
);
581 dir
->i_mtime
= CURRENT_TIME
;
589 * Normal filesystems would do a "d_delete()" to tell the VFS dcache
590 * that the file no longer exists. However, doing that means that the
591 * VFS layer can turn the dentry into a negative dentry. We don't want
592 * this, because the unlink is probably the result of an expire.
593 * We simply d_drop it and add it to a expiring list in the super block,
594 * which allows the dentry lookup to check for an incomplete expire.
596 * If a process is blocked on the dentry waiting for the expire to finish,
597 * it will invalidate the dentry and try to mount with a new one.
599 * Also see autofs4_dir_rmdir()..
601 static int autofs4_dir_unlink(struct inode
*dir
, struct dentry
*dentry
)
603 struct autofs_sb_info
*sbi
= autofs4_sbi(dir
->i_sb
);
604 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
605 struct autofs_info
*p_ino
;
607 /* This allows root to remove symlinks */
608 if (!autofs4_oz_mode(sbi
) && !capable(CAP_SYS_ADMIN
))
611 if (atomic_dec_and_test(&ino
->count
)) {
612 p_ino
= autofs4_dentry_ino(dentry
->d_parent
);
613 if (p_ino
&& dentry
->d_parent
!= dentry
)
614 atomic_dec(&p_ino
->count
);
618 dentry
->d_inode
->i_size
= 0;
619 clear_nlink(dentry
->d_inode
);
621 dir
->i_mtime
= CURRENT_TIME
;
623 spin_lock(&autofs4_lock
);
624 autofs4_add_expiring(dentry
);
625 spin_lock(&dentry
->d_lock
);
627 spin_unlock(&dentry
->d_lock
);
628 spin_unlock(&autofs4_lock
);
633 static int autofs4_dir_rmdir(struct inode
*dir
, struct dentry
*dentry
)
635 struct autofs_sb_info
*sbi
= autofs4_sbi(dir
->i_sb
);
636 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
637 struct autofs_info
*p_ino
;
639 DPRINTK("dentry %p, removing %.*s",
640 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
642 if (!autofs4_oz_mode(sbi
))
645 spin_lock(&autofs4_lock
);
646 spin_lock(&sbi
->lookup_lock
);
647 spin_lock(&dentry
->d_lock
);
648 if (!list_empty(&dentry
->d_subdirs
)) {
649 spin_unlock(&dentry
->d_lock
);
650 spin_unlock(&sbi
->lookup_lock
);
651 spin_unlock(&autofs4_lock
);
654 __autofs4_add_expiring(dentry
);
655 spin_unlock(&sbi
->lookup_lock
);
657 spin_unlock(&dentry
->d_lock
);
658 spin_unlock(&autofs4_lock
);
660 if (atomic_dec_and_test(&ino
->count
)) {
661 p_ino
= autofs4_dentry_ino(dentry
->d_parent
);
662 if (p_ino
&& dentry
->d_parent
!= dentry
)
663 atomic_dec(&p_ino
->count
);
666 dentry
->d_inode
->i_size
= 0;
667 clear_nlink(dentry
->d_inode
);
675 static int autofs4_dir_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
677 struct autofs_sb_info
*sbi
= autofs4_sbi(dir
->i_sb
);
678 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
679 struct autofs_info
*p_ino
;
682 if (!autofs4_oz_mode(sbi
))
685 DPRINTK("dentry %p, creating %.*s",
686 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
688 ino
= autofs4_init_ino(ino
, sbi
, S_IFDIR
| 0555);
692 autofs4_del_active(dentry
);
694 inode
= autofs4_get_inode(dir
->i_sb
, ino
);
696 if (!dentry
->d_fsdata
)
700 d_add(dentry
, inode
);
702 dentry
->d_fsdata
= ino
;
703 ino
->dentry
= dget(dentry
);
704 atomic_inc(&ino
->count
);
705 p_ino
= autofs4_dentry_ino(dentry
->d_parent
);
706 if (p_ino
&& dentry
->d_parent
!= dentry
)
707 atomic_inc(&p_ino
->count
);
709 dir
->i_mtime
= CURRENT_TIME
;
714 /* Get/set timeout ioctl() operation */
716 static inline int autofs4_compat_get_set_timeout(struct autofs_sb_info
*sbi
,
717 compat_ulong_t __user
*p
)
720 unsigned long ntimeout
;
722 if ((rv
= get_user(ntimeout
, p
)) ||
723 (rv
= put_user(sbi
->exp_timeout
/HZ
, p
)))
726 if (ntimeout
> UINT_MAX
/HZ
)
727 sbi
->exp_timeout
= 0;
729 sbi
->exp_timeout
= ntimeout
* HZ
;
735 static inline int autofs4_get_set_timeout(struct autofs_sb_info
*sbi
,
736 unsigned long __user
*p
)
739 unsigned long ntimeout
;
741 if ((rv
= get_user(ntimeout
, p
)) ||
742 (rv
= put_user(sbi
->exp_timeout
/HZ
, p
)))
745 if (ntimeout
> ULONG_MAX
/HZ
)
746 sbi
->exp_timeout
= 0;
748 sbi
->exp_timeout
= ntimeout
* HZ
;
753 /* Return protocol version */
754 static inline int autofs4_get_protover(struct autofs_sb_info
*sbi
, int __user
*p
)
756 return put_user(sbi
->version
, p
);
759 /* Return protocol sub version */
760 static inline int autofs4_get_protosubver(struct autofs_sb_info
*sbi
, int __user
*p
)
762 return put_user(sbi
->sub_version
, p
);
766 * Tells the daemon whether it can umount the autofs mount.
768 static inline int autofs4_ask_umount(struct vfsmount
*mnt
, int __user
*p
)
775 DPRINTK("returning %d", status
);
777 status
= put_user(status
, p
);
782 /* Identify autofs4_dentries - this is so we can tell if there's
783 an extra dentry refcount or not. We only hold a refcount on the
784 dentry if its non-negative (ie, d_inode != NULL)
786 int is_autofs4_dentry(struct dentry
*dentry
)
788 return dentry
&& dentry
->d_inode
&&
789 (dentry
->d_op
== &autofs4_mount_dentry_operations
||
790 dentry
->d_op
== &autofs4_dentry_operations
) &&
791 dentry
->d_fsdata
!= NULL
;
795 * ioctl()'s on the root directory is the chief method for the daemon to
796 * generate kernel reactions
798 static int autofs4_root_ioctl_unlocked(struct inode
*inode
, struct file
*filp
,
799 unsigned int cmd
, unsigned long arg
)
801 struct autofs_sb_info
*sbi
= autofs4_sbi(inode
->i_sb
);
802 void __user
*p
= (void __user
*)arg
;
804 DPRINTK("cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u",
805 cmd
,arg
,sbi
,task_pgrp_nr(current
));
807 if (_IOC_TYPE(cmd
) != _IOC_TYPE(AUTOFS_IOC_FIRST
) ||
808 _IOC_NR(cmd
) - _IOC_NR(AUTOFS_IOC_FIRST
) >= AUTOFS_IOC_COUNT
)
811 if (!autofs4_oz_mode(sbi
) && !capable(CAP_SYS_ADMIN
))
815 case AUTOFS_IOC_READY
: /* Wait queue: go ahead and retry */
816 return autofs4_wait_release(sbi
,(autofs_wqt_t
)arg
,0);
817 case AUTOFS_IOC_FAIL
: /* Wait queue: fail with ENOENT */
818 return autofs4_wait_release(sbi
,(autofs_wqt_t
)arg
,-ENOENT
);
819 case AUTOFS_IOC_CATATONIC
: /* Enter catatonic mode (daemon shutdown) */
820 autofs4_catatonic_mode(sbi
);
822 case AUTOFS_IOC_PROTOVER
: /* Get protocol version */
823 return autofs4_get_protover(sbi
, p
);
824 case AUTOFS_IOC_PROTOSUBVER
: /* Get protocol sub version */
825 return autofs4_get_protosubver(sbi
, p
);
826 case AUTOFS_IOC_SETTIMEOUT
:
827 return autofs4_get_set_timeout(sbi
, p
);
829 case AUTOFS_IOC_SETTIMEOUT32
:
830 return autofs4_compat_get_set_timeout(sbi
, p
);
833 case AUTOFS_IOC_ASKUMOUNT
:
834 return autofs4_ask_umount(filp
->f_path
.mnt
, p
);
836 /* return a single thing to expire */
837 case AUTOFS_IOC_EXPIRE
:
838 return autofs4_expire_run(inode
->i_sb
,filp
->f_path
.mnt
,sbi
, p
);
839 /* same as above, but can send multiple expires through pipe */
840 case AUTOFS_IOC_EXPIRE_MULTI
:
841 return autofs4_expire_multi(inode
->i_sb
,filp
->f_path
.mnt
,sbi
, p
);
848 static long autofs4_root_ioctl(struct file
*filp
,
849 unsigned int cmd
, unsigned long arg
)
851 struct inode
*inode
= filp
->f_dentry
->d_inode
;
852 return autofs4_root_ioctl_unlocked(inode
, filp
, cmd
, arg
);
856 static long autofs4_root_compat_ioctl(struct file
*filp
,
857 unsigned int cmd
, unsigned long arg
)
859 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
862 if (cmd
== AUTOFS_IOC_READY
|| cmd
== AUTOFS_IOC_FAIL
)
863 ret
= autofs4_root_ioctl_unlocked(inode
, filp
, cmd
, arg
);
865 ret
= autofs4_root_ioctl_unlocked(inode
, filp
, cmd
,
866 (unsigned long)compat_ptr(arg
));