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/param.h>
19 #include <linux/time.h>
20 #include <linux/smp_lock.h>
23 static int autofs4_dir_symlink(struct inode
*,struct dentry
*,const char *);
24 static int autofs4_dir_unlink(struct inode
*,struct dentry
*);
25 static int autofs4_dir_rmdir(struct inode
*,struct dentry
*);
26 static int autofs4_dir_mkdir(struct inode
*,struct dentry
*,int);
27 static int autofs4_root_ioctl(struct inode
*, struct file
*,unsigned int,unsigned long);
28 static int autofs4_dir_open(struct inode
*inode
, struct file
*file
);
29 static int autofs4_dir_close(struct inode
*inode
, struct file
*file
);
30 static int autofs4_dir_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
);
31 static int autofs4_root_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
);
32 static struct dentry
*autofs4_lookup(struct inode
*,struct dentry
*, struct nameidata
*);
33 static void *autofs4_follow_link(struct dentry
*, struct nameidata
*);
35 const struct file_operations autofs4_root_operations
= {
36 .open
= dcache_dir_open
,
37 .release
= dcache_dir_close
,
38 .read
= generic_read_dir
,
39 .readdir
= autofs4_root_readdir
,
40 .ioctl
= autofs4_root_ioctl
,
43 const struct file_operations autofs4_dir_operations
= {
44 .open
= autofs4_dir_open
,
45 .release
= autofs4_dir_close
,
46 .read
= generic_read_dir
,
47 .readdir
= autofs4_dir_readdir
,
50 struct inode_operations autofs4_indirect_root_inode_operations
= {
51 .lookup
= autofs4_lookup
,
52 .unlink
= autofs4_dir_unlink
,
53 .symlink
= autofs4_dir_symlink
,
54 .mkdir
= autofs4_dir_mkdir
,
55 .rmdir
= autofs4_dir_rmdir
,
58 struct inode_operations autofs4_direct_root_inode_operations
= {
59 .lookup
= autofs4_lookup
,
60 .unlink
= autofs4_dir_unlink
,
61 .mkdir
= autofs4_dir_mkdir
,
62 .rmdir
= autofs4_dir_rmdir
,
63 .follow_link
= autofs4_follow_link
,
66 struct inode_operations autofs4_dir_inode_operations
= {
67 .lookup
= autofs4_lookup
,
68 .unlink
= autofs4_dir_unlink
,
69 .symlink
= autofs4_dir_symlink
,
70 .mkdir
= autofs4_dir_mkdir
,
71 .rmdir
= autofs4_dir_rmdir
,
74 static int autofs4_root_readdir(struct file
*file
, void *dirent
,
77 struct autofs_sb_info
*sbi
= autofs4_sbi(file
->f_dentry
->d_sb
);
78 int oz_mode
= autofs4_oz_mode(sbi
);
80 DPRINTK("called, filp->f_pos = %lld", file
->f_pos
);
83 * Don't set reghost flag if:
84 * 1) f_pos is larger than zero -- we've already been here.
85 * 2) we haven't even enabled reghosting in the 1st place.
86 * 3) this is the daemon doing a readdir
88 if (oz_mode
&& file
->f_pos
== 0 && sbi
->reghost_enabled
)
89 sbi
->needs_reghost
= 1;
91 DPRINTK("needs_reghost = %d", sbi
->needs_reghost
);
93 return dcache_readdir(file
, dirent
, filldir
);
96 static int autofs4_dir_open(struct inode
*inode
, struct file
*file
)
98 struct dentry
*dentry
= file
->f_dentry
;
99 struct vfsmount
*mnt
= file
->f_vfsmnt
;
100 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
101 struct dentry
*cursor
;
104 status
= dcache_dir_open(inode
, file
);
108 cursor
= file
->private_data
;
109 cursor
->d_fsdata
= NULL
;
111 DPRINTK("file=%p dentry=%p %.*s",
112 file
, dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
114 if (autofs4_oz_mode(sbi
))
117 if (autofs4_ispending(dentry
)) {
118 DPRINTK("dentry busy");
119 dcache_dir_close(inode
, file
);
125 if (!d_mountpoint(dentry
) && dentry
->d_op
&& dentry
->d_op
->d_revalidate
) {
129 /* In case there are stale directory dentrys from a failed mount */
130 spin_lock(&dcache_lock
);
131 empty
= list_empty(&dentry
->d_subdirs
);
132 spin_unlock(&dcache_lock
);
135 d_invalidate(dentry
);
137 nd
.flags
= LOOKUP_DIRECTORY
;
138 ret
= (dentry
->d_op
->d_revalidate
)(dentry
, &nd
);
141 dcache_dir_close(inode
, file
);
146 if (d_mountpoint(dentry
)) {
147 struct file
*fp
= NULL
;
148 struct vfsmount
*fp_mnt
= mntget(mnt
);
149 struct dentry
*fp_dentry
= dget(dentry
);
151 if (!autofs4_follow_mount(&fp_mnt
, &fp_dentry
)) {
154 dcache_dir_close(inode
, file
);
158 fp
= dentry_open(fp_dentry
, fp_mnt
, file
->f_flags
);
159 status
= PTR_ERR(fp
);
161 dcache_dir_close(inode
, file
);
164 cursor
->d_fsdata
= fp
;
171 static int autofs4_dir_close(struct inode
*inode
, struct file
*file
)
173 struct dentry
*dentry
= file
->f_dentry
;
174 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
175 struct dentry
*cursor
= file
->private_data
;
178 DPRINTK("file=%p dentry=%p %.*s",
179 file
, dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
181 if (autofs4_oz_mode(sbi
))
184 if (autofs4_ispending(dentry
)) {
185 DPRINTK("dentry busy");
190 if (d_mountpoint(dentry
)) {
191 struct file
*fp
= cursor
->d_fsdata
;
196 filp_close(fp
, current
->files
);
199 dcache_dir_close(inode
, file
);
203 static int autofs4_dir_readdir(struct file
*file
, void *dirent
, filldir_t filldir
)
205 struct dentry
*dentry
= file
->f_dentry
;
206 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
207 struct dentry
*cursor
= file
->private_data
;
210 DPRINTK("file=%p dentry=%p %.*s",
211 file
, dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
213 if (autofs4_oz_mode(sbi
))
216 if (autofs4_ispending(dentry
)) {
217 DPRINTK("dentry busy");
221 if (d_mountpoint(dentry
)) {
222 struct file
*fp
= cursor
->d_fsdata
;
227 if (!fp
->f_op
|| !fp
->f_op
->readdir
)
230 status
= vfs_readdir(fp
, filldir
, dirent
);
231 file
->f_pos
= fp
->f_pos
;
233 autofs4_copy_atime(file
, fp
);
237 return dcache_readdir(file
, dirent
, filldir
);
240 static int try_to_fill_dentry(struct dentry
*dentry
, int flags
)
242 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
243 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
246 /* Block on any pending expiry here; invalidate the dentry
247 when expiration is done to trigger mount request with a new
249 if (ino
&& (ino
->flags
& AUTOFS_INF_EXPIRING
)) {
250 DPRINTK("waiting for expire %p name=%.*s",
251 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
253 status
= autofs4_wait(sbi
, dentry
, NFY_NONE
);
255 DPRINTK("expire done status=%d", status
);
258 * If the directory still exists the mount request must
259 * continue otherwise it can't be followed at the right
260 * time during the walk.
262 status
= d_invalidate(dentry
);
263 if (status
!= -EBUSY
)
267 DPRINTK("dentry=%p %.*s ino=%p",
268 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
, dentry
->d_inode
);
271 * Wait for a pending mount, triggering one if there
274 if (dentry
->d_inode
== NULL
) {
275 DPRINTK("waiting for mount name=%.*s",
276 dentry
->d_name
.len
, dentry
->d_name
.name
);
278 status
= autofs4_wait(sbi
, dentry
, NFY_MOUNT
);
280 DPRINTK("mount done status=%d", status
);
282 if (status
&& dentry
->d_inode
)
283 return status
; /* Try to get the kernel to invalidate this dentry */
285 /* Turn this into a real negative dentry? */
286 if (status
== -ENOENT
) {
287 spin_lock(&dentry
->d_lock
);
288 dentry
->d_flags
&= ~DCACHE_AUTOFS_PENDING
;
289 spin_unlock(&dentry
->d_lock
);
292 /* Return a negative dentry, but leave it "pending" */
295 /* Trigger mount for path component or follow link */
296 } else if (flags
& (LOOKUP_CONTINUE
| LOOKUP_DIRECTORY
) ||
297 current
->link_count
) {
298 DPRINTK("waiting for mount name=%.*s",
299 dentry
->d_name
.len
, dentry
->d_name
.name
);
301 spin_lock(&dentry
->d_lock
);
302 dentry
->d_flags
|= DCACHE_AUTOFS_PENDING
;
303 spin_unlock(&dentry
->d_lock
);
304 status
= autofs4_wait(sbi
, dentry
, NFY_MOUNT
);
306 DPRINTK("mount done status=%d", status
);
309 spin_lock(&dentry
->d_lock
);
310 dentry
->d_flags
&= ~DCACHE_AUTOFS_PENDING
;
311 spin_unlock(&dentry
->d_lock
);
316 /* Initialize expiry counter after successful mount */
318 ino
->last_used
= jiffies
;
320 spin_lock(&dentry
->d_lock
);
321 dentry
->d_flags
&= ~DCACHE_AUTOFS_PENDING
;
322 spin_unlock(&dentry
->d_lock
);
326 /* For autofs direct mounts the follow link triggers the mount */
327 static void *autofs4_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
329 struct autofs_sb_info
*sbi
= autofs4_sbi(dentry
->d_sb
);
330 int oz_mode
= autofs4_oz_mode(sbi
);
331 unsigned int lookup_type
;
334 DPRINTK("dentry=%p %.*s oz_mode=%d nd->flags=%d",
335 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
, oz_mode
,
338 /* If it's our master or we shouldn't trigger a mount we're done */
339 lookup_type
= nd
->flags
& (LOOKUP_CONTINUE
| LOOKUP_DIRECTORY
);
340 if (oz_mode
|| !lookup_type
)
344 * If a request is pending wait for it.
345 * If it's a mount then it won't be expired till at least
346 * a liitle later and if it's an expire then we might need
349 if (autofs4_ispending(dentry
)) {
350 DPRINTK("waiting for active request %p name=%.*s",
351 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
353 status
= autofs4_wait(sbi
, dentry
, NFY_NONE
);
355 DPRINTK("request done status=%d", status
);
359 * If the dentry contains directories then it is an
360 * autofs multi-mount with no root mount offset. So
361 * don't try to mount it again.
363 spin_lock(&dcache_lock
);
364 if (!d_mountpoint(dentry
) && list_empty(&dentry
->d_subdirs
)) {
365 spin_unlock(&dcache_lock
);
367 status
= try_to_fill_dentry(dentry
, 0);
372 * The mount succeeded but if there is no root mount
373 * it must be an autofs multi-mount with no root offset
374 * so we don't need to follow the mount.
376 if (d_mountpoint(dentry
)) {
377 if (!autofs4_follow_mount(&nd
->mnt
, &nd
->dentry
)) {
385 spin_unlock(&dcache_lock
);
392 return ERR_PTR(status
);
396 * Revalidate is called on every cache lookup. Some of those
397 * cache lookups may actually happen while the dentry is not
398 * yet completely filled in, and revalidate has to delay such
401 static int autofs4_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
403 struct inode
*dir
= dentry
->d_parent
->d_inode
;
404 struct autofs_sb_info
*sbi
= autofs4_sbi(dir
->i_sb
);
405 int oz_mode
= autofs4_oz_mode(sbi
);
406 int flags
= nd
? nd
->flags
: 0;
410 if (autofs4_ispending(dentry
)) {
412 status
= try_to_fill_dentry(dentry
, flags
);
416 /* Negative dentry.. invalidate if "old" */
417 if (dentry
->d_inode
== NULL
)
420 /* Check for a non-mountpoint directory with no contents */
421 spin_lock(&dcache_lock
);
422 if (S_ISDIR(dentry
->d_inode
->i_mode
) &&
423 !d_mountpoint(dentry
) &&
424 __simple_empty(dentry
)) {
425 DPRINTK("dentry=%p %.*s, emptydir",
426 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
427 spin_unlock(&dcache_lock
);
429 status
= try_to_fill_dentry(dentry
, flags
);
432 spin_unlock(&dcache_lock
);
437 void autofs4_dentry_release(struct dentry
*de
)
439 struct autofs_info
*inf
;
441 DPRINTK("releasing %p", de
);
443 inf
= autofs4_dentry_ino(de
);
450 autofs4_free_ino(inf
);
454 /* For dentries of directories in the root dir */
455 static struct dentry_operations autofs4_root_dentry_operations
= {
456 .d_revalidate
= autofs4_revalidate
,
457 .d_release
= autofs4_dentry_release
,
460 /* For other dentries */
461 static struct dentry_operations autofs4_dentry_operations
= {
462 .d_revalidate
= autofs4_revalidate
,
463 .d_release
= autofs4_dentry_release
,
466 /* Lookups in the root directory */
467 static struct dentry
*autofs4_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
)
469 struct autofs_sb_info
*sbi
;
472 DPRINTK("name = %.*s",
473 dentry
->d_name
.len
, dentry
->d_name
.name
);
475 /* File name too long to exist */
476 if (dentry
->d_name
.len
> NAME_MAX
)
477 return ERR_PTR(-ENAMETOOLONG
);
479 sbi
= autofs4_sbi(dir
->i_sb
);
480 oz_mode
= autofs4_oz_mode(sbi
);
482 DPRINTK("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d",
483 current
->pid
, process_group(current
), sbi
->catatonic
, oz_mode
);
486 * Mark the dentry incomplete, but add it. This is needed so
487 * that the VFS layer knows about the dentry, and we can count
488 * on catching any lookups through the revalidate.
490 * Let all the hard work be done by the revalidate function that
491 * needs to be able to do this anyway..
493 * We need to do this before we release the directory semaphore.
495 dentry
->d_op
= &autofs4_root_dentry_operations
;
498 spin_lock(&dentry
->d_lock
);
499 dentry
->d_flags
|= DCACHE_AUTOFS_PENDING
;
500 spin_unlock(&dentry
->d_lock
);
502 dentry
->d_fsdata
= NULL
;
505 if (dentry
->d_op
&& dentry
->d_op
->d_revalidate
) {
506 mutex_unlock(&dir
->i_mutex
);
507 (dentry
->d_op
->d_revalidate
)(dentry
, nd
);
508 mutex_lock(&dir
->i_mutex
);
512 * If we are still pending, check if we had to handle
513 * a signal. If so we can force a restart..
515 if (dentry
->d_flags
& DCACHE_AUTOFS_PENDING
) {
516 /* See if we were interrupted */
517 if (signal_pending(current
)) {
518 sigset_t
*sigset
= ¤t
->pending
.signal
;
519 if (sigismember (sigset
, SIGKILL
) ||
520 sigismember (sigset
, SIGQUIT
) ||
521 sigismember (sigset
, SIGINT
)) {
522 return ERR_PTR(-ERESTARTNOINTR
);
528 * If this dentry is unhashed, then we shouldn't honour this
529 * lookup even if the dentry is positive. Returning ENOENT here
530 * doesn't do the right thing for all system calls, but it should
531 * be OK for the operations we permit from an autofs.
533 if (dentry
->d_inode
&& d_unhashed(dentry
))
534 return ERR_PTR(-ENOENT
);
539 static int autofs4_dir_symlink(struct inode
*dir
,
540 struct dentry
*dentry
,
543 struct autofs_sb_info
*sbi
= autofs4_sbi(dir
->i_sb
);
544 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
545 struct autofs_info
*p_ino
;
549 DPRINTK("%s <- %.*s", symname
,
550 dentry
->d_name
.len
, dentry
->d_name
.name
);
552 if (!autofs4_oz_mode(sbi
))
555 ino
= autofs4_init_ino(ino
, sbi
, S_IFLNK
| 0555);
559 ino
->size
= strlen(symname
);
560 ino
->u
.symlink
= cp
= kmalloc(ino
->size
+ 1, GFP_KERNEL
);
569 inode
= autofs4_get_inode(dir
->i_sb
, ino
);
570 d_instantiate(dentry
, inode
);
572 if (dir
== dir
->i_sb
->s_root
->d_inode
)
573 dentry
->d_op
= &autofs4_root_dentry_operations
;
575 dentry
->d_op
= &autofs4_dentry_operations
;
577 dentry
->d_fsdata
= ino
;
578 ino
->dentry
= dget(dentry
);
579 atomic_inc(&ino
->count
);
580 p_ino
= autofs4_dentry_ino(dentry
->d_parent
);
581 if (p_ino
&& dentry
->d_parent
!= dentry
)
582 atomic_inc(&p_ino
->count
);
585 dir
->i_mtime
= CURRENT_TIME
;
593 * Normal filesystems would do a "d_delete()" to tell the VFS dcache
594 * that the file no longer exists. However, doing that means that the
595 * VFS layer can turn the dentry into a negative dentry. We don't want
596 * this, because since the unlink is probably the result of an expire.
597 * We simply d_drop it, which allows the dentry lookup to remount it
600 * If a process is blocked on the dentry waiting for the expire to finish,
601 * it will invalidate the dentry and try to mount with a new one.
603 * Also see autofs4_dir_rmdir()..
605 static int autofs4_dir_unlink(struct inode
*dir
, struct dentry
*dentry
)
607 struct autofs_sb_info
*sbi
= autofs4_sbi(dir
->i_sb
);
608 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
609 struct autofs_info
*p_ino
;
611 /* This allows root to remove symlinks */
612 if ( !autofs4_oz_mode(sbi
) && !capable(CAP_SYS_ADMIN
) )
615 if (atomic_dec_and_test(&ino
->count
)) {
616 p_ino
= autofs4_dentry_ino(dentry
->d_parent
);
617 if (p_ino
&& dentry
->d_parent
!= dentry
)
618 atomic_dec(&p_ino
->count
);
622 dentry
->d_inode
->i_size
= 0;
623 dentry
->d_inode
->i_nlink
= 0;
625 dir
->i_mtime
= CURRENT_TIME
;
632 static int autofs4_dir_rmdir(struct inode
*dir
, struct dentry
*dentry
)
634 struct autofs_sb_info
*sbi
= autofs4_sbi(dir
->i_sb
);
635 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
636 struct autofs_info
*p_ino
;
638 if (!autofs4_oz_mode(sbi
))
641 spin_lock(&dcache_lock
);
642 if (!list_empty(&dentry
->d_subdirs
)) {
643 spin_unlock(&dcache_lock
);
646 spin_lock(&dentry
->d_lock
);
648 spin_unlock(&dentry
->d_lock
);
649 spin_unlock(&dcache_lock
);
651 if (atomic_dec_and_test(&ino
->count
)) {
652 p_ino
= autofs4_dentry_ino(dentry
->d_parent
);
653 if (p_ino
&& dentry
->d_parent
!= dentry
)
654 atomic_dec(&p_ino
->count
);
657 dentry
->d_inode
->i_size
= 0;
658 dentry
->d_inode
->i_nlink
= 0;
666 static int autofs4_dir_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
668 struct autofs_sb_info
*sbi
= autofs4_sbi(dir
->i_sb
);
669 struct autofs_info
*ino
= autofs4_dentry_ino(dentry
);
670 struct autofs_info
*p_ino
;
673 if ( !autofs4_oz_mode(sbi
) )
676 DPRINTK("dentry %p, creating %.*s",
677 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
679 ino
= autofs4_init_ino(ino
, sbi
, S_IFDIR
| 0555);
683 inode
= autofs4_get_inode(dir
->i_sb
, ino
);
684 d_instantiate(dentry
, inode
);
686 if (dir
== dir
->i_sb
->s_root
->d_inode
)
687 dentry
->d_op
= &autofs4_root_dentry_operations
;
689 dentry
->d_op
= &autofs4_dentry_operations
;
691 dentry
->d_fsdata
= ino
;
692 ino
->dentry
= dget(dentry
);
693 atomic_inc(&ino
->count
);
694 p_ino
= autofs4_dentry_ino(dentry
->d_parent
);
695 if (p_ino
&& dentry
->d_parent
!= dentry
)
696 atomic_inc(&p_ino
->count
);
699 dir
->i_mtime
= CURRENT_TIME
;
704 /* Get/set timeout ioctl() operation */
705 static inline int autofs4_get_set_timeout(struct autofs_sb_info
*sbi
,
706 unsigned long __user
*p
)
709 unsigned long ntimeout
;
711 if ( (rv
= get_user(ntimeout
, p
)) ||
712 (rv
= put_user(sbi
->exp_timeout
/HZ
, p
)) )
715 if ( ntimeout
> ULONG_MAX
/HZ
)
716 sbi
->exp_timeout
= 0;
718 sbi
->exp_timeout
= ntimeout
* HZ
;
723 /* Return protocol version */
724 static inline int autofs4_get_protover(struct autofs_sb_info
*sbi
, int __user
*p
)
726 return put_user(sbi
->version
, p
);
729 /* Return protocol sub version */
730 static inline int autofs4_get_protosubver(struct autofs_sb_info
*sbi
, int __user
*p
)
732 return put_user(sbi
->sub_version
, p
);
736 * Tells the daemon whether we need to reghost or not. Also, clears
737 * the reghost_needed flag.
739 static inline int autofs4_ask_reghost(struct autofs_sb_info
*sbi
, int __user
*p
)
743 DPRINTK("returning %d", sbi
->needs_reghost
);
745 status
= put_user(sbi
->needs_reghost
, p
);
749 sbi
->needs_reghost
= 0;
754 * Enable / Disable reghosting ioctl() operation
756 static inline int autofs4_toggle_reghost(struct autofs_sb_info
*sbi
, int __user
*p
)
761 status
= get_user(val
, p
);
763 DPRINTK("reghost = %d", val
);
768 /* turn on/off reghosting, with the val */
769 sbi
->reghost_enabled
= val
;
774 * Tells the daemon whether it can umount the autofs mount.
776 static inline int autofs4_ask_umount(struct vfsmount
*mnt
, int __user
*p
)
783 DPRINTK("returning %d", status
);
785 status
= put_user(status
, p
);
790 /* Identify autofs4_dentries - this is so we can tell if there's
791 an extra dentry refcount or not. We only hold a refcount on the
792 dentry if its non-negative (ie, d_inode != NULL)
794 int is_autofs4_dentry(struct dentry
*dentry
)
796 return dentry
&& dentry
->d_inode
&&
797 (dentry
->d_op
== &autofs4_root_dentry_operations
||
798 dentry
->d_op
== &autofs4_dentry_operations
) &&
799 dentry
->d_fsdata
!= NULL
;
803 * ioctl()'s on the root directory is the chief method for the daemon to
804 * generate kernel reactions
806 static int autofs4_root_ioctl(struct inode
*inode
, struct file
*filp
,
807 unsigned int cmd
, unsigned long arg
)
809 struct autofs_sb_info
*sbi
= autofs4_sbi(inode
->i_sb
);
810 void __user
*p
= (void __user
*)arg
;
812 DPRINTK("cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u",
813 cmd
,arg
,sbi
,process_group(current
));
815 if ( _IOC_TYPE(cmd
) != _IOC_TYPE(AUTOFS_IOC_FIRST
) ||
816 _IOC_NR(cmd
) - _IOC_NR(AUTOFS_IOC_FIRST
) >= AUTOFS_IOC_COUNT
)
819 if ( !autofs4_oz_mode(sbi
) && !capable(CAP_SYS_ADMIN
) )
823 case AUTOFS_IOC_READY
: /* Wait queue: go ahead and retry */
824 return autofs4_wait_release(sbi
,(autofs_wqt_t
)arg
,0);
825 case AUTOFS_IOC_FAIL
: /* Wait queue: fail with ENOENT */
826 return autofs4_wait_release(sbi
,(autofs_wqt_t
)arg
,-ENOENT
);
827 case AUTOFS_IOC_CATATONIC
: /* Enter catatonic mode (daemon shutdown) */
828 autofs4_catatonic_mode(sbi
);
830 case AUTOFS_IOC_PROTOVER
: /* Get protocol version */
831 return autofs4_get_protover(sbi
, p
);
832 case AUTOFS_IOC_PROTOSUBVER
: /* Get protocol sub version */
833 return autofs4_get_protosubver(sbi
, p
);
834 case AUTOFS_IOC_SETTIMEOUT
:
835 return autofs4_get_set_timeout(sbi
, p
);
837 case AUTOFS_IOC_TOGGLEREGHOST
:
838 return autofs4_toggle_reghost(sbi
, p
);
839 case AUTOFS_IOC_ASKREGHOST
:
840 return autofs4_ask_reghost(sbi
, p
);
842 case AUTOFS_IOC_ASKUMOUNT
:
843 return autofs4_ask_umount(filp
->f_vfsmnt
, p
);
845 /* return a single thing to expire */
846 case AUTOFS_IOC_EXPIRE
:
847 return autofs4_expire_run(inode
->i_sb
,filp
->f_vfsmnt
,sbi
, p
);
848 /* same as above, but can send multiple expires through pipe */
849 case AUTOFS_IOC_EXPIRE_MULTI
:
850 return autofs4_expire_multi(inode
->i_sb
,filp
->f_vfsmnt
,sbi
, p
);