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 static int autofs4_dir_symlink(struct inode *,struct dentry *,const char *);
27 static int autofs4_dir_unlink(struct inode *,struct dentry *);
28 static int autofs4_dir_rmdir(struct inode *,struct dentry *);
29 static int autofs4_dir_mkdir(struct inode *,struct dentry *,umode_t);
30 static long autofs4_root_ioctl(struct file *,unsigned int,unsigned long);
32 static long autofs4_root_compat_ioctl(struct file *,unsigned int,unsigned long);
34 static int autofs4_dir_open(struct inode *inode, struct file *file);
35 static struct dentry *autofs4_lookup(struct inode *,struct dentry *, unsigned int);
36 static struct vfsmount *autofs4_d_automount(struct path *);
37 static int autofs4_d_manage(struct dentry *, bool);
38 static void autofs4_dentry_release(struct dentry *);
40 const struct file_operations autofs4_root_operations = {
41 .open = dcache_dir_open,
42 .release = dcache_dir_close,
43 .read = generic_read_dir,
44 .readdir = dcache_readdir,
45 .llseek = dcache_dir_lseek,
46 .unlocked_ioctl = autofs4_root_ioctl,
48 .compat_ioctl = autofs4_root_compat_ioctl,
52 const struct file_operations autofs4_dir_operations = {
53 .open = autofs4_dir_open,
54 .release = dcache_dir_close,
55 .read = generic_read_dir,
56 .readdir = dcache_readdir,
57 .llseek = dcache_dir_lseek,
60 const struct inode_operations autofs4_dir_inode_operations = {
61 .lookup = autofs4_lookup,
62 .unlink = autofs4_dir_unlink,
63 .symlink = autofs4_dir_symlink,
64 .mkdir = autofs4_dir_mkdir,
65 .rmdir = autofs4_dir_rmdir,
68 const struct dentry_operations autofs4_dentry_operations = {
69 .d_automount = autofs4_d_automount,
70 .d_manage = autofs4_d_manage,
71 .d_release = autofs4_dentry_release,
74 static void autofs4_add_active(struct dentry *dentry)
76 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
77 struct autofs_info *ino = autofs4_dentry_ino(dentry);
79 spin_lock(&sbi->lookup_lock);
80 if (!ino->active_count) {
81 if (list_empty(&ino->active))
82 list_add(&ino->active, &sbi->active_list);
85 spin_unlock(&sbi->lookup_lock);
90 static void autofs4_del_active(struct dentry *dentry)
92 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
93 struct autofs_info *ino = autofs4_dentry_ino(dentry);
95 spin_lock(&sbi->lookup_lock);
97 if (!ino->active_count) {
98 if (!list_empty(&ino->active))
99 list_del_init(&ino->active);
101 spin_unlock(&sbi->lookup_lock);
106 static int autofs4_dir_open(struct inode *inode, struct file *file)
108 struct dentry *dentry = file->f_path.dentry;
109 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
111 DPRINTK("file=%p dentry=%p %.*s",
112 file, dentry, dentry->d_name.len, dentry->d_name.name);
114 if (autofs4_oz_mode(sbi))
118 * An empty directory in an autofs file system is always a
119 * mount point. The daemon must have failed to mount this
120 * during lookup so it doesn't exist. This can happen, for
121 * example, if user space returns an incorrect status for a
122 * mount request. Otherwise we're doing a readdir on the
123 * autofs file system so just let the libfs routines handle
126 spin_lock(&sbi->lookup_lock);
127 spin_lock(&dentry->d_lock);
128 if (!d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) {
129 spin_unlock(&dentry->d_lock);
130 spin_unlock(&sbi->lookup_lock);
133 spin_unlock(&dentry->d_lock);
134 spin_unlock(&sbi->lookup_lock);
137 return dcache_dir_open(inode, file);
140 static void autofs4_dentry_release(struct dentry *de)
142 struct autofs_info *ino = autofs4_dentry_ino(de);
143 struct autofs_sb_info *sbi = autofs4_sbi(de->d_sb);
145 DPRINTK("releasing %p", de);
151 spin_lock(&sbi->lookup_lock);
152 if (!list_empty(&ino->active))
153 list_del(&ino->active);
154 if (!list_empty(&ino->expiring))
155 list_del(&ino->expiring);
156 spin_unlock(&sbi->lookup_lock);
159 autofs4_free_ino(ino);
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(&sbi->lookup_lock);
173 head = &sbi->active_list;
174 list_for_each(p, head) {
175 struct autofs_info *ino;
176 struct dentry *active;
179 ino = list_entry(p, struct autofs_info, active);
180 active = ino->dentry;
182 spin_lock(&active->d_lock);
185 if (active->d_count == 0)
188 qstr = &active->d_name;
190 if (active->d_name.hash != hash)
192 if (active->d_parent != parent)
195 if (qstr->len != len)
197 if (memcmp(qstr->name, str, len))
200 if (d_unhashed(active)) {
202 spin_unlock(&active->d_lock);
203 spin_unlock(&sbi->lookup_lock);
207 spin_unlock(&active->d_lock);
209 spin_unlock(&sbi->lookup_lock);
214 static struct dentry *autofs4_lookup_expiring(struct dentry *dentry)
216 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
217 struct dentry *parent = dentry->d_parent;
218 struct qstr *name = &dentry->d_name;
219 unsigned int len = name->len;
220 unsigned int hash = name->hash;
221 const unsigned char *str = name->name;
222 struct list_head *p, *head;
224 spin_lock(&sbi->lookup_lock);
225 head = &sbi->expiring_list;
226 list_for_each(p, head) {
227 struct autofs_info *ino;
228 struct dentry *expiring;
231 ino = list_entry(p, struct autofs_info, expiring);
232 expiring = ino->dentry;
234 spin_lock(&expiring->d_lock);
236 /* Bad luck, we've already been dentry_iput */
237 if (!expiring->d_inode)
240 qstr = &expiring->d_name;
242 if (expiring->d_name.hash != hash)
244 if (expiring->d_parent != parent)
247 if (qstr->len != len)
249 if (memcmp(qstr->name, str, len))
252 if (d_unhashed(expiring)) {
253 dget_dlock(expiring);
254 spin_unlock(&expiring->d_lock);
255 spin_unlock(&sbi->lookup_lock);
259 spin_unlock(&expiring->d_lock);
261 spin_unlock(&sbi->lookup_lock);
266 static int autofs4_mount_wait(struct dentry *dentry)
268 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
269 struct autofs_info *ino = autofs4_dentry_ino(dentry);
272 if (ino->flags & AUTOFS_INF_PENDING) {
273 DPRINTK("waiting for mount name=%.*s",
274 dentry->d_name.len, dentry->d_name.name);
275 status = autofs4_wait(sbi, dentry, NFY_MOUNT);
276 DPRINTK("mount wait done status=%d", status);
278 ino->last_used = jiffies;
282 static int do_expire_wait(struct dentry *dentry)
284 struct dentry *expiring;
286 expiring = autofs4_lookup_expiring(dentry);
288 return autofs4_expire_wait(dentry);
291 * If we are racing with expire the request might not
292 * be quite complete, but the directory has been removed
293 * so it must have been successful, just wait for it.
295 autofs4_expire_wait(expiring);
296 autofs4_del_expiring(expiring);
302 static struct dentry *autofs4_mountpoint_changed(struct path *path)
304 struct dentry *dentry = path->dentry;
305 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
308 * If this is an indirect mount the dentry could have gone away
309 * as a result of an expire and a new one created.
311 if (autofs_type_indirect(sbi->type) && d_unhashed(dentry)) {
312 struct dentry *parent = dentry->d_parent;
313 struct autofs_info *ino;
314 struct dentry *new = d_lookup(parent, &dentry->d_name);
317 ino = autofs4_dentry_ino(new);
318 ino->last_used = jiffies;
325 static struct vfsmount *autofs4_d_automount(struct path *path)
327 struct dentry *dentry = path->dentry;
328 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
329 struct autofs_info *ino = autofs4_dentry_ino(dentry);
332 DPRINTK("dentry=%p %.*s",
333 dentry, dentry->d_name.len, dentry->d_name.name);
335 /* The daemon never triggers a mount. */
336 if (autofs4_oz_mode(sbi))
340 * If an expire request is pending everyone must wait.
341 * If the expire fails we're still mounted so continue
342 * the follow and return. A return of -EAGAIN (which only
343 * happens with indirect mounts) means the expire completed
344 * and the directory was removed, so just go ahead and try
347 status = do_expire_wait(dentry);
348 if (status && status != -EAGAIN)
351 /* Callback to the daemon to perform the mount or wait */
352 spin_lock(&sbi->fs_lock);
353 if (ino->flags & AUTOFS_INF_PENDING) {
354 spin_unlock(&sbi->fs_lock);
355 status = autofs4_mount_wait(dentry);
357 return ERR_PTR(status);
362 * If the dentry is a symlink it's equivalent to a directory
363 * having d_mountpoint() true, so there's no need to call back
366 if (dentry->d_inode && S_ISLNK(dentry->d_inode->i_mode)) {
367 spin_unlock(&sbi->fs_lock);
371 if (!d_mountpoint(dentry)) {
373 * It's possible that user space hasn't removed directories
374 * after umounting a rootless multi-mount, although it
375 * should. For v5 have_submounts() is sufficient to handle
376 * this because the leaves of the directory tree under the
377 * mount never trigger mounts themselves (they have an autofs
378 * trigger mount mounted on them). But v4 pseudo direct mounts
379 * do need the leaves to to trigger mounts. In this case we
380 * have no choice but to use the list_empty() check and
381 * require user space behave.
383 if (sbi->version > 4) {
384 if (have_submounts(dentry)) {
385 spin_unlock(&sbi->fs_lock);
389 spin_lock(&dentry->d_lock);
390 if (!list_empty(&dentry->d_subdirs)) {
391 spin_unlock(&dentry->d_lock);
394 spin_unlock(&dentry->d_lock);
396 ino->flags |= AUTOFS_INF_PENDING;
397 spin_unlock(&sbi->fs_lock);
398 status = autofs4_mount_wait(dentry);
399 spin_lock(&sbi->fs_lock);
400 ino->flags &= ~AUTOFS_INF_PENDING;
402 spin_unlock(&sbi->fs_lock);
403 return ERR_PTR(status);
406 spin_unlock(&sbi->fs_lock);
408 /* Mount succeeded, check if we ended up with a new dentry */
409 dentry = autofs4_mountpoint_changed(path);
411 return ERR_PTR(-ENOENT);
416 int autofs4_d_manage(struct dentry *dentry, bool rcu_walk)
418 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
419 struct autofs_info *ino = autofs4_dentry_ino(dentry);
422 DPRINTK("dentry=%p %.*s",
423 dentry, dentry->d_name.len, dentry->d_name.name);
425 /* The daemon never waits. */
426 if (autofs4_oz_mode(sbi)) {
429 if (!d_mountpoint(dentry))
434 /* We need to sleep, so we need pathwalk to be in ref-mode */
438 /* Wait for pending expires */
439 do_expire_wait(dentry);
442 * This dentry may be under construction so wait on mount
445 status = autofs4_mount_wait(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 ((!d_mountpoint(dentry) && !simple_empty(dentry)) ||
465 (dentry->d_inode && S_ISLNK(dentry->d_inode->i_mode)))
468 spin_unlock(&sbi->fs_lock);
473 /* Lookups in the root directory */
474 static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
476 struct autofs_sb_info *sbi;
477 struct autofs_info *ino;
478 struct dentry *active;
480 DPRINTK("name = %.*s", dentry->d_name.len, dentry->d_name.name);
482 /* File name too long to exist */
483 if (dentry->d_name.len > NAME_MAX)
484 return ERR_PTR(-ENAMETOOLONG);
486 sbi = autofs4_sbi(dir->i_sb);
488 DPRINTK("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d",
489 current->pid, task_pgrp_nr(current), sbi->catatonic,
490 autofs4_oz_mode(sbi));
492 active = autofs4_lookup_active(dentry);
497 * A dentry that is not within the root can never trigger a
498 * mount operation, unless the directory already exists, so we
499 * can return fail immediately. The daemon however does need
500 * to create directories within the file system.
502 if (!autofs4_oz_mode(sbi) && !IS_ROOT(dentry->d_parent))
503 return ERR_PTR(-ENOENT);
505 /* Mark entries in the root as mount triggers */
506 if (autofs_type_indirect(sbi->type) && IS_ROOT(dentry->d_parent))
507 __managed_dentry_set_managed(dentry);
509 ino = autofs4_new_ino(sbi);
511 return ERR_PTR(-ENOMEM);
513 dentry->d_fsdata = ino;
514 ino->dentry = dentry;
516 autofs4_add_active(dentry);
518 d_instantiate(dentry, NULL);
523 static int autofs4_dir_symlink(struct inode *dir,
524 struct dentry *dentry,
527 struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
528 struct autofs_info *ino = autofs4_dentry_ino(dentry);
529 struct autofs_info *p_ino;
531 size_t size = strlen(symname);
534 DPRINTK("%s <- %.*s", symname,
535 dentry->d_name.len, dentry->d_name.name);
537 if (!autofs4_oz_mode(sbi))
542 autofs4_clean_ino(ino);
544 autofs4_del_active(dentry);
546 cp = kmalloc(size + 1, GFP_KERNEL);
552 inode = autofs4_get_inode(dir->i_sb, S_IFLNK | 0555);
555 if (!dentry->d_fsdata)
559 inode->i_private = cp;
560 inode->i_size = size;
561 d_add(dentry, inode);
564 atomic_inc(&ino->count);
565 p_ino = autofs4_dentry_ino(dentry->d_parent);
566 if (p_ino && dentry->d_parent != dentry)
567 atomic_inc(&p_ino->count);
569 dir->i_mtime = CURRENT_TIME;
577 * Normal filesystems would do a "d_delete()" to tell the VFS dcache
578 * that the file no longer exists. However, doing that means that the
579 * VFS layer can turn the dentry into a negative dentry. We don't want
580 * this, because the unlink is probably the result of an expire.
581 * We simply d_drop it and add it to a expiring list in the super block,
582 * which allows the dentry lookup to check for an incomplete expire.
584 * If a process is blocked on the dentry waiting for the expire to finish,
585 * it will invalidate the dentry and try to mount with a new one.
587 * Also see autofs4_dir_rmdir()..
589 static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry)
591 struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
592 struct autofs_info *ino = autofs4_dentry_ino(dentry);
593 struct autofs_info *p_ino;
595 /* This allows root to remove symlinks */
596 if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
599 if (atomic_dec_and_test(&ino->count)) {
600 p_ino = autofs4_dentry_ino(dentry->d_parent);
601 if (p_ino && dentry->d_parent != dentry)
602 atomic_dec(&p_ino->count);
606 dentry->d_inode->i_size = 0;
607 clear_nlink(dentry->d_inode);
609 dir->i_mtime = CURRENT_TIME;
611 spin_lock(&sbi->lookup_lock);
612 __autofs4_add_expiring(dentry);
613 spin_lock(&dentry->d_lock);
615 spin_unlock(&dentry->d_lock);
616 spin_unlock(&sbi->lookup_lock);
622 * Version 4 of autofs provides a pseudo direct mount implementation
623 * that relies on directories at the leaves of a directory tree under
624 * an indirect mount to trigger mounts. To allow for this we need to
625 * set the DMANAGED_AUTOMOUNT and DMANAGED_TRANSIT flags on the leaves
626 * of the directory tree. There is no need to clear the automount flag
627 * following a mount or restore it after an expire because these mounts
628 * are always covered. However, it is necessary to ensure that these
629 * flags are clear on non-empty directories to avoid unnecessary calls
632 static void autofs_set_leaf_automount_flags(struct dentry *dentry)
634 struct dentry *parent;
636 /* root and dentrys in the root are already handled */
637 if (IS_ROOT(dentry->d_parent))
640 managed_dentry_set_managed(dentry);
642 parent = dentry->d_parent;
643 /* only consider parents below dentrys in the root */
644 if (IS_ROOT(parent->d_parent))
646 managed_dentry_clear_managed(parent);
650 static void autofs_clear_leaf_automount_flags(struct dentry *dentry)
652 struct list_head *d_child;
653 struct dentry *parent;
655 /* flags for dentrys in the root are handled elsewhere */
656 if (IS_ROOT(dentry->d_parent))
659 managed_dentry_clear_managed(dentry);
661 parent = dentry->d_parent;
662 /* only consider parents below dentrys in the root */
663 if (IS_ROOT(parent->d_parent))
665 d_child = &dentry->d_u.d_child;
666 /* Set parent managed if it's becoming empty */
667 if (d_child->next == &parent->d_subdirs &&
668 d_child->prev == &parent->d_subdirs)
669 managed_dentry_set_managed(parent);
673 static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry)
675 struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
676 struct autofs_info *ino = autofs4_dentry_ino(dentry);
677 struct autofs_info *p_ino;
679 DPRINTK("dentry %p, removing %.*s",
680 dentry, dentry->d_name.len, dentry->d_name.name);
682 if (!autofs4_oz_mode(sbi))
685 spin_lock(&sbi->lookup_lock);
686 spin_lock(&dentry->d_lock);
687 if (!list_empty(&dentry->d_subdirs)) {
688 spin_unlock(&dentry->d_lock);
689 spin_unlock(&sbi->lookup_lock);
692 __autofs4_add_expiring(dentry);
694 spin_unlock(&dentry->d_lock);
695 spin_unlock(&sbi->lookup_lock);
697 if (sbi->version < 5)
698 autofs_clear_leaf_automount_flags(dentry);
700 if (atomic_dec_and_test(&ino->count)) {
701 p_ino = autofs4_dentry_ino(dentry->d_parent);
702 if (p_ino && dentry->d_parent != dentry)
703 atomic_dec(&p_ino->count);
706 dentry->d_inode->i_size = 0;
707 clear_nlink(dentry->d_inode);
715 static int autofs4_dir_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
717 struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
718 struct autofs_info *ino = autofs4_dentry_ino(dentry);
719 struct autofs_info *p_ino;
722 if (!autofs4_oz_mode(sbi))
725 DPRINTK("dentry %p, creating %.*s",
726 dentry, dentry->d_name.len, dentry->d_name.name);
730 autofs4_clean_ino(ino);
732 autofs4_del_active(dentry);
734 inode = autofs4_get_inode(dir->i_sb, S_IFDIR | 0555);
737 d_add(dentry, inode);
739 if (sbi->version < 5)
740 autofs_set_leaf_automount_flags(dentry);
743 atomic_inc(&ino->count);
744 p_ino = autofs4_dentry_ino(dentry->d_parent);
745 if (p_ino && dentry->d_parent != dentry)
746 atomic_inc(&p_ino->count);
748 dir->i_mtime = CURRENT_TIME;
753 /* Get/set timeout ioctl() operation */
755 static inline int autofs4_compat_get_set_timeout(struct autofs_sb_info *sbi,
756 compat_ulong_t __user *p)
759 unsigned long ntimeout;
761 if ((rv = get_user(ntimeout, p)) ||
762 (rv = put_user(sbi->exp_timeout/HZ, p)))
765 if (ntimeout > UINT_MAX/HZ)
766 sbi->exp_timeout = 0;
768 sbi->exp_timeout = ntimeout * HZ;
774 static inline int autofs4_get_set_timeout(struct autofs_sb_info *sbi,
775 unsigned long __user *p)
778 unsigned long ntimeout;
780 if ((rv = get_user(ntimeout, p)) ||
781 (rv = put_user(sbi->exp_timeout/HZ, p)))
784 if (ntimeout > ULONG_MAX/HZ)
785 sbi->exp_timeout = 0;
787 sbi->exp_timeout = ntimeout * HZ;
792 /* Return protocol version */
793 static inline int autofs4_get_protover(struct autofs_sb_info *sbi, int __user *p)
795 return put_user(sbi->version, p);
798 /* Return protocol sub version */
799 static inline int autofs4_get_protosubver(struct autofs_sb_info *sbi, int __user *p)
801 return put_user(sbi->sub_version, p);
805 * Tells the daemon whether it can umount the autofs mount.
807 static inline int autofs4_ask_umount(struct vfsmount *mnt, int __user *p)
814 DPRINTK("returning %d", status);
816 status = put_user(status, p);
821 /* Identify autofs4_dentries - this is so we can tell if there's
822 an extra dentry refcount or not. We only hold a refcount on the
823 dentry if its non-negative (ie, d_inode != NULL)
825 int is_autofs4_dentry(struct dentry *dentry)
827 return dentry && dentry->d_inode &&
828 dentry->d_op == &autofs4_dentry_operations &&
829 dentry->d_fsdata != NULL;
833 * ioctl()'s on the root directory is the chief method for the daemon to
834 * generate kernel reactions
836 static int autofs4_root_ioctl_unlocked(struct inode *inode, struct file *filp,
837 unsigned int cmd, unsigned long arg)
839 struct autofs_sb_info *sbi = autofs4_sbi(inode->i_sb);
840 void __user *p = (void __user *)arg;
842 DPRINTK("cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u",
843 cmd,arg,sbi,task_pgrp_nr(current));
845 if (_IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) ||
846 _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT)
849 if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
853 case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */
854 return autofs4_wait_release(sbi,(autofs_wqt_t)arg,0);
855 case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */
856 return autofs4_wait_release(sbi,(autofs_wqt_t)arg,-ENOENT);
857 case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */
858 autofs4_catatonic_mode(sbi);
860 case AUTOFS_IOC_PROTOVER: /* Get protocol version */
861 return autofs4_get_protover(sbi, p);
862 case AUTOFS_IOC_PROTOSUBVER: /* Get protocol sub version */
863 return autofs4_get_protosubver(sbi, p);
864 case AUTOFS_IOC_SETTIMEOUT:
865 return autofs4_get_set_timeout(sbi, p);
867 case AUTOFS_IOC_SETTIMEOUT32:
868 return autofs4_compat_get_set_timeout(sbi, p);
871 case AUTOFS_IOC_ASKUMOUNT:
872 return autofs4_ask_umount(filp->f_path.mnt, p);
874 /* return a single thing to expire */
875 case AUTOFS_IOC_EXPIRE:
876 return autofs4_expire_run(inode->i_sb,filp->f_path.mnt,sbi, p);
877 /* same as above, but can send multiple expires through pipe */
878 case AUTOFS_IOC_EXPIRE_MULTI:
879 return autofs4_expire_multi(inode->i_sb,filp->f_path.mnt,sbi, p);
886 static long autofs4_root_ioctl(struct file *filp,
887 unsigned int cmd, unsigned long arg)
889 struct inode *inode = filp->f_dentry->d_inode;
890 return autofs4_root_ioctl_unlocked(inode, filp, cmd, arg);
894 static long autofs4_root_compat_ioctl(struct file *filp,
895 unsigned int cmd, unsigned long arg)
897 struct inode *inode = filp->f_path.dentry->d_inode;
900 if (cmd == AUTOFS_IOC_READY || cmd == AUTOFS_IOC_FAIL)
901 ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, arg);
903 ret = autofs4_root_ioctl_unlocked(inode, filp, cmd,
904 (unsigned long)compat_ptr(arg));