[mirror_ubuntu-jammy-kernel.git] / fs / autofs4 / autofs_i.h

/* -*- c -*- ------------------------------------------------------------- *
 *   
 * linux/fs/autofs/autofs_i.h
 *
 *   Copyright 1997-1998 Transmeta Corporation - All Rights Reserved
 *   Copyright 2005-2006 Ian Kent <raven@themaw.net>
 *
 * This file is part of the Linux kernel and is made available under
 * the terms of the GNU General Public License, version 2, or at your
 * option, any later version, incorporated herein by reference.
 *
 * ----------------------------------------------------------------------- */

/* Internal header file for autofs */

#include <linux/auto_fs4.h>
#include <linux/auto_dev-ioctl.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/list.h>

/* This is the range of ioctl() numbers we claim as ours */
#define AUTOFS_IOC_FIRST     AUTOFS_IOC_READY
#define AUTOFS_IOC_COUNT     32

#define AUTOFS_DEV_IOCTL_IOC_FIRST	(AUTOFS_DEV_IOCTL_VERSION)
#define AUTOFS_DEV_IOCTL_IOC_COUNT	(AUTOFS_IOC_COUNT - 11)

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/string.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <asm/current.h>
#include <asm/uaccess.h>

/* #define DEBUG */

#define DPRINTK(fmt, ...)				\
	pr_debug("pid %d: %s: " fmt "\n",		\
		current->pid, __func__, ##__VA_ARGS__)

#define AUTOFS_WARN(fmt, ...)				\
	printk(KERN_WARNING "pid %d: %s: " fmt "\n",	\
		current->pid, __func__, ##__VA_ARGS__)

#define AUTOFS_ERROR(fmt, ...)				\
	printk(KERN_ERR "pid %d: %s: " fmt "\n",	\
		current->pid, __func__, ##__VA_ARGS__)

/* Unified info structure.  This is pointed to by both the dentry and
   inode structures.  Each file in the filesystem has an instance of this
   structure.  It holds a reference to the dentry, so dentries are never
   flushed while the file exists.  All name lookups are dealt with at the
   dentry level, although the filesystem can interfere in the validation
   process.  Readdir is implemented by traversing the dentry lists. */
struct autofs_info {
	struct dentry	*dentry;
	struct inode	*inode;

	int		flags;

	struct completion expire_complete;

	struct list_head active;
	int active_count;

	struct list_head expiring;

	struct autofs_sb_info *sbi;
	unsigned long last_used;
	atomic_t count;

	uid_t uid;
	gid_t gid;
};

#define AUTOFS_INF_EXPIRING	(1<<0) /* dentry is in the process of expiring */
#define AUTOFS_INF_PENDING	(1<<2) /* dentry pending mount */

struct autofs_wait_queue {
	wait_queue_head_t queue;
	struct autofs_wait_queue *next;
	autofs_wqt_t wait_queue_token;
	/* We use the following to see what we are waiting for */
	struct qstr name;
	u32 dev;
	u64 ino;
	uid_t uid;
	gid_t gid;
	pid_t pid;
	pid_t tgid;
	/* This is for status reporting upon return */
	int status;
	unsigned int wait_ctr;
};

#define AUTOFS_SBI_MAGIC 0x6d4a556d

struct autofs_sb_info {
	u32 magic;
	int pipefd;
	struct file *pipe;
	pid_t oz_pgrp;
	int catatonic;
	int version;
	int sub_version;
	int min_proto;
	int max_proto;
	unsigned long exp_timeout;
	unsigned int type;
	int reghost_enabled;
	int needs_reghost;
	struct super_block *sb;
	struct mutex wq_mutex;
	spinlock_t fs_lock;
	struct autofs_wait_queue *queues; /* Wait queue pointer */
	spinlock_t lookup_lock;
	struct list_head active_list;
	struct list_head expiring_list;
};

static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb)
{
	return (struct autofs_sb_info *)(sb->s_fs_info);
}

static inline struct autofs_info *autofs4_dentry_ino(struct dentry *dentry)
{
	return (struct autofs_info *)(dentry->d_fsdata);
}

/* autofs4_oz_mode(): do we see the man behind the curtain?  (The
   processes which do manipulations for us in user space sees the raw
   filesystem without "magic".) */

static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) {
	return sbi->catatonic || task_pgrp_nr(current) == sbi->oz_pgrp;
}

/* Does a dentry have some pending activity? */
static inline int autofs4_ispending(struct dentry *dentry)
{
	struct autofs_info *inf = autofs4_dentry_ino(dentry);

	if (inf->flags & AUTOFS_INF_PENDING)
		return 1;

	if (inf->flags & AUTOFS_INF_EXPIRING)
		return 1;

	return 0;
}

struct inode *autofs4_get_inode(struct super_block *, mode_t);
void autofs4_free_ino(struct autofs_info *);

/* Expiration */
int is_autofs4_dentry(struct dentry *);
int autofs4_expire_wait(struct dentry *dentry);
int autofs4_expire_run(struct super_block *, struct vfsmount *,
			struct autofs_sb_info *,
			struct autofs_packet_expire __user *);
int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
			    struct autofs_sb_info *sbi, int when);
int autofs4_expire_multi(struct super_block *, struct vfsmount *,
			struct autofs_sb_info *, int __user *);
struct dentry *autofs4_expire_direct(struct super_block *sb,
				     struct vfsmount *mnt,
				     struct autofs_sb_info *sbi, int how);
struct dentry *autofs4_expire_indirect(struct super_block *sb,
				       struct vfsmount *mnt,
				       struct autofs_sb_info *sbi, int how);

/* Device node initialization */

int autofs_dev_ioctl_init(void);
void autofs_dev_ioctl_exit(void);

/* Operations structures */

extern const struct inode_operations autofs4_symlink_inode_operations;
extern const struct inode_operations autofs4_dir_inode_operations;
extern const struct file_operations autofs4_dir_operations;
extern const struct file_operations autofs4_root_operations;
extern const struct dentry_operations autofs4_dentry_operations;

/* VFS automount flags management functions */

static inline void __managed_dentry_set_automount(struct dentry *dentry)
{
	dentry->d_flags |= DCACHE_NEED_AUTOMOUNT;
}

static inline void managed_dentry_set_automount(struct dentry *dentry)
{
	spin_lock(&dentry->d_lock);
	__managed_dentry_set_automount(dentry);
	spin_unlock(&dentry->d_lock);
}

static inline void __managed_dentry_clear_automount(struct dentry *dentry)
{
	dentry->d_flags &= ~DCACHE_NEED_AUTOMOUNT;
}

static inline void managed_dentry_clear_automount(struct dentry *dentry)
{
	spin_lock(&dentry->d_lock);
	__managed_dentry_clear_automount(dentry);
	spin_unlock(&dentry->d_lock);
}

static inline void __managed_dentry_set_transit(struct dentry *dentry)
{
	dentry->d_flags |= DCACHE_MANAGE_TRANSIT;
}

static inline void managed_dentry_set_transit(struct dentry *dentry)
{
	spin_lock(&dentry->d_lock);
	__managed_dentry_set_transit(dentry);
	spin_unlock(&dentry->d_lock);
}

static inline void __managed_dentry_clear_transit(struct dentry *dentry)
{
	dentry->d_flags &= ~DCACHE_MANAGE_TRANSIT;
}

static inline void managed_dentry_clear_transit(struct dentry *dentry)
{
	spin_lock(&dentry->d_lock);
	__managed_dentry_clear_transit(dentry);
	spin_unlock(&dentry->d_lock);
}

static inline void __managed_dentry_set_managed(struct dentry *dentry)
{
	dentry->d_flags |= (DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
}

static inline void managed_dentry_set_managed(struct dentry *dentry)
{
	spin_lock(&dentry->d_lock);
	__managed_dentry_set_managed(dentry);
	spin_unlock(&dentry->d_lock);
}

static inline void __managed_dentry_clear_managed(struct dentry *dentry)
{
	dentry->d_flags &= ~(DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
}

static inline void managed_dentry_clear_managed(struct dentry *dentry)
{
	spin_lock(&dentry->d_lock);
	__managed_dentry_clear_managed(dentry);
	spin_unlock(&dentry->d_lock);
}

/* Initializing function */

int autofs4_fill_super(struct super_block *, void *, int);
struct autofs_info *autofs4_new_ino(struct autofs_sb_info *);
void autofs4_clean_ino(struct autofs_info *);

/* Queue management functions */

int autofs4_wait(struct autofs_sb_info *,struct dentry *, enum autofs_notify);
int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
void autofs4_catatonic_mode(struct autofs_sb_info *);

static inline u32 autofs4_get_dev(struct autofs_sb_info *sbi)
{
	return new_encode_dev(sbi->sb->s_dev);
}

static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi)
{
	return sbi->sb->s_root->d_inode->i_ino;
}

static inline int simple_positive(struct dentry *dentry)
{
	return dentry->d_inode && !d_unhashed(dentry);
}

static inline void __autofs4_add_expiring(struct dentry *dentry)
{
	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
	struct autofs_info *ino = autofs4_dentry_ino(dentry);
	if (ino) {
		if (list_empty(&ino->expiring))
			list_add(&ino->expiring, &sbi->expiring_list);
	}
	return;
}

static inline void autofs4_add_expiring(struct dentry *dentry)
{
	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
	struct autofs_info *ino = autofs4_dentry_ino(dentry);
	if (ino) {
		spin_lock(&sbi->lookup_lock);
		if (list_empty(&ino->expiring))
			list_add(&ino->expiring, &sbi->expiring_list);
		spin_unlock(&sbi->lookup_lock);
	}
	return;
}

static inline void autofs4_del_expiring(struct dentry *dentry)
{
	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
	struct autofs_info *ino = autofs4_dentry_ino(dentry);
	if (ino) {
		spin_lock(&sbi->lookup_lock);
		if (!list_empty(&ino->expiring))
			list_del_init(&ino->expiring);
		spin_unlock(&sbi->lookup_lock);
	}
	return;
}

extern void autofs4_kill_sb(struct super_block *);
Commit	Line	Data
1da177e4 LT	1	/* -- c -- ------------------------------------------------------------- *
	2	*
	3	* linux/fs/autofs/autofs_i.h
	4	*
	5	* Copyright 1997-1998 Transmeta Corporation - All Rights Reserved
34ca959c	6	* Copyright 2005-2006 Ian Kent <raven@themaw.net>
1da177e4 LT	7	*
	8	* This file is part of the Linux kernel and is made available under
	9	* the terms of the GNU General Public License, version 2, or at your
	10	* option, any later version, incorporated herein by reference.
	11	*
	12	* ----------------------------------------------------------------------- */
	13
	14	/* Internal header file for autofs */
	15
	16	#include <linux/auto_fs4.h>
8d7b48e0	17	#include <linux/auto_dev-ioctl.h>
1d5599e3	18	#include <linux/mutex.h>
b5c84bf6	19	#include <linux/spinlock.h>
1da177e4 LT	20	#include <linux/list.h>
	21
	22	/* This is the range of ioctl() numbers we claim as ours */
	23	#define AUTOFS_IOC_FIRST AUTOFS_IOC_READY
	24	#define AUTOFS_IOC_COUNT 32
	25
8d7b48e0 IK	26	#define AUTOFS_DEV_IOCTL_IOC_FIRST (AUTOFS_DEV_IOCTL_VERSION)
	27	#define AUTOFS_DEV_IOCTL_IOC_COUNT (AUTOFS_IOC_COUNT - 11)
	28
1da177e4 LT	29	#include <linux/kernel.h>
	30	#include <linux/slab.h>
	31	#include <linux/time.h>
	32	#include <linux/string.h>
	33	#include <linux/wait.h>
	34	#include <linux/sched.h>
	35	#include <linux/mount.h>
	36	#include <linux/namei.h>
	37	#include <asm/current.h>
	38	#include <asm/uaccess.h>
	39
	40	/* #define DEBUG */
	41
c3ad9962 LT	42	#define DPRINTK(fmt, ...) \
	43	pr_debug("pid %d: %s: " fmt "\n", \
	44	current->pid, __func__, ##__VA_ARGS__)
1da177e4	45
c3ad9962	46	#define AUTOFS_WARN(fmt, ...) \
8d7b48e0	47	printk(KERN_WARNING "pid %d: %s: " fmt "\n", \
c3ad9962	48	current->pid, __func__, ##__VA_ARGS__)
8d7b48e0	49
c3ad9962	50	#define AUTOFS_ERROR(fmt, ...) \
8d7b48e0	51	printk(KERN_ERR "pid %d: %s: " fmt "\n", \
c3ad9962	52	current->pid, __func__, ##__VA_ARGS__)
8d7b48e0	53
1da177e4 LT	54	/* Unified info structure. This is pointed to by both the dentry and
	55	inode structures. Each file in the filesystem has an instance of this
	56	structure. It holds a reference to the dentry, so dentries are never
	57	flushed while the file exists. All name lookups are dealt with at the
	58	dentry level, although the filesystem can interfere in the validation
	59	process. Readdir is implemented by traversing the dentry lists. */
	60	struct autofs_info {
	61	struct dentry *dentry;
	62	struct inode *inode;
	63
	64	int flags;
	65
6e60a9ab IK	66	struct completion expire_complete;
6e60a9ab IK	67
25767378	68	struct list_head active;
4f8427d1 IK	69	int active_count;
4f8427d1 IK	70
5f6f4f28	71	struct list_head expiring;
f50b6f86	72
1da177e4 LT	73	struct autofs_sb_info *sbi;
1da177e4 LT	74	unsigned long last_used;
1aff3c8b	75	atomic_t count;
1da177e4	76
c0f54d3e IK	77	uid_t uid;
c0f54d3e IK	78	gid_t gid;
1da177e4 LT	79	};
	80
	81	#define AUTOFS_INF_EXPIRING (1<<0) /* dentry is in the process of expiring */
aa952eb2	82	#define AUTOFS_INF_PENDING (1<<2) /* dentry pending mount */
1da177e4 LT	83
	84	struct autofs_wait_queue {
	85	wait_queue_head_t queue;
	86	struct autofs_wait_queue *next;
	87	autofs_wqt_t wait_queue_token;
	88	/* We use the following to see what we are waiting for */
70b52a0a	89	struct qstr name;
5c0a32fc IK	90	u32 dev;
	91	u64 ino;
	92	uid_t uid;
	93	gid_t gid;
	94	pid_t pid;
	95	pid_t tgid;
1da177e4 LT	96	/* This is for status reporting upon return */
1da177e4 LT	97	int status;
296f7bf7	98	unsigned int wait_ctr;
1da177e4 LT	99	};
	100
	101	#define AUTOFS_SBI_MAGIC 0x6d4a556d
	102
	103	struct autofs_sb_info {
	104	u32 magic;
d7c4a5f1	105	int pipefd;
1da177e4 LT	106	struct file *pipe;
	107	pid_t oz_pgrp;
	108	int catatonic;
	109	int version;
	110	int sub_version;
d7c4a5f1 IK	111	int min_proto;
d7c4a5f1 IK	112	int max_proto;
1da177e4	113	unsigned long exp_timeout;
34ca959c	114	unsigned int type;
1da177e4 LT	115	int reghost_enabled;
	116	int needs_reghost;
	117	struct super_block *sb;
1d5599e3	118	struct mutex wq_mutex;
3a9720ce	119	spinlock_t fs_lock;
1da177e4	120	struct autofs_wait_queue queues; / Wait queue pointer */
5f6f4f28	121	spinlock_t lookup_lock;
25767378	122	struct list_head active_list;
5f6f4f28	123	struct list_head expiring_list;
1da177e4 LT	124	};
	125
	126	static inline struct autofs_sb_info autofs4_sbi(struct super_block sb)
	127	{
	128	return (struct autofs_sb_info *)(sb->s_fs_info);
	129	}
	130
	131	static inline struct autofs_info autofs4_dentry_ino(struct dentry dentry)
	132	{
	133	return (struct autofs_info *)(dentry->d_fsdata);
	134	}
	135
	136	/* autofs4_oz_mode(): do we see the man behind the curtain? (The
	137	processes which do manipulations for us in user space sees the raw
	138	filesystem without "magic".) */
	139
	140	static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) {
a47afb0f	141	return sbi->catatonic \|\| task_pgrp_nr(current) == sbi->oz_pgrp;
1da177e4 LT	142	}
	143
	144	/* Does a dentry have some pending activity? */
	145	static inline int autofs4_ispending(struct dentry *dentry)
	146	{
	147	struct autofs_info *inf = autofs4_dentry_ino(dentry);
	148
aa952eb2	149	if (inf->flags & AUTOFS_INF_PENDING)
3a9720ce IK	150	return 1;
3a9720ce IK	151
97e7449a IK	152	if (inf->flags & AUTOFS_INF_EXPIRING)
97e7449a IK	153	return 1;
3a9720ce	154
97e7449a	155	return 0;
1da177e4 LT	156	}
1da177e4 LT	157
726a5e06	158	struct inode autofs4_get_inode(struct super_block , mode_t);
1da177e4 LT	159	void autofs4_free_ino(struct autofs_info *);
	160
	161	/* Expiration */
	162	int is_autofs4_dentry(struct dentry *);
06a35985	163	int autofs4_expire_wait(struct dentry *dentry);
1da177e4 LT	164	int autofs4_expire_run(struct super_block , struct vfsmount ,
	165	struct autofs_sb_info *,
	166	struct autofs_packet_expire __user *);
56fcef75 IK	167	int autofs4_do_expire_multi(struct super_block sb, struct vfsmount mnt,
56fcef75 IK	168	struct autofs_sb_info *sbi, int when);
1da177e4 LT	169	int autofs4_expire_multi(struct super_block , struct vfsmount ,
1da177e4 LT	170	struct autofs_sb_info , int __user );
8d7b48e0 IK	171	struct dentry autofs4_expire_direct(struct super_block sb,
	172	struct vfsmount *mnt,
	173	struct autofs_sb_info *sbi, int how);
	174	struct dentry autofs4_expire_indirect(struct super_block sb,
	175	struct vfsmount *mnt,
	176	struct autofs_sb_info *sbi, int how);
	177
	178	/* Device node initialization */
	179
	180	int autofs_dev_ioctl_init(void);
	181	void autofs_dev_ioctl_exit(void);
1da177e4 LT	182
	183	/* Operations structures */
	184
754661f1 AV	185	extern const struct inode_operations autofs4_symlink_inode_operations;
754661f1 AV	186	extern const struct inode_operations autofs4_dir_inode_operations;
4b6f5d20 AV	187	extern const struct file_operations autofs4_dir_operations;
4b6f5d20 AV	188	extern const struct file_operations autofs4_root_operations;
71e469db	189	extern const struct dentry_operations autofs4_dentry_operations;
10584211 IK	190
	191	/* VFS automount flags management functions */
	192
	193	static inline void __managed_dentry_set_automount(struct dentry *dentry)
	194	{
	195	dentry->d_flags \|= DCACHE_NEED_AUTOMOUNT;
	196	}
	197
	198	static inline void managed_dentry_set_automount(struct dentry *dentry)
	199	{
	200	spin_lock(&dentry->d_lock);
	201	__managed_dentry_set_automount(dentry);
	202	spin_unlock(&dentry->d_lock);
	203	}
	204
	205	static inline void __managed_dentry_clear_automount(struct dentry *dentry)
	206	{
	207	dentry->d_flags &= ~DCACHE_NEED_AUTOMOUNT;
	208	}
	209
	210	static inline void managed_dentry_clear_automount(struct dentry *dentry)
	211	{
	212	spin_lock(&dentry->d_lock);
	213	__managed_dentry_clear_automount(dentry);
	214	spin_unlock(&dentry->d_lock);
	215	}
	216
b5b80177 IK	217	static inline void __managed_dentry_set_transit(struct dentry *dentry)
	218	{
	219	dentry->d_flags \|= DCACHE_MANAGE_TRANSIT;
	220	}
	221
	222	static inline void managed_dentry_set_transit(struct dentry *dentry)
	223	{
	224	spin_lock(&dentry->d_lock);
	225	__managed_dentry_set_transit(dentry);
	226	spin_unlock(&dentry->d_lock);
	227	}
	228
	229	static inline void __managed_dentry_clear_transit(struct dentry *dentry)
	230	{
	231	dentry->d_flags &= ~DCACHE_MANAGE_TRANSIT;
	232	}
	233
	234	static inline void managed_dentry_clear_transit(struct dentry *dentry)
	235	{
	236	spin_lock(&dentry->d_lock);
	237	__managed_dentry_clear_transit(dentry);
	238	spin_unlock(&dentry->d_lock);
	239	}
	240
	241	static inline void __managed_dentry_set_managed(struct dentry *dentry)
	242	{
	243	dentry->d_flags \|= (DCACHE_NEED_AUTOMOUNT\|DCACHE_MANAGE_TRANSIT);
	244	}
	245
	246	static inline void managed_dentry_set_managed(struct dentry *dentry)
	247	{
	248	spin_lock(&dentry->d_lock);
	249	__managed_dentry_set_managed(dentry);
	250	spin_unlock(&dentry->d_lock);
	251	}
	252
	253	static inline void __managed_dentry_clear_managed(struct dentry *dentry)
	254	{
	255	dentry->d_flags &= ~(DCACHE_NEED_AUTOMOUNT\|DCACHE_MANAGE_TRANSIT);
	256	}
	257
	258	static inline void managed_dentry_clear_managed(struct dentry *dentry)
	259	{
	260	spin_lock(&dentry->d_lock);
	261	__managed_dentry_clear_managed(dentry);
	262	spin_unlock(&dentry->d_lock);
	263	}
	264
1da177e4 LT	265	/* Initializing function */
	266
	267	int autofs4_fill_super(struct super_block , void , int);
26e6c910 AV	268	struct autofs_info autofs4_new_ino(struct autofs_sb_info );
26e6c910 AV	269	void autofs4_clean_ino(struct autofs_info *);
1da177e4 LT	270
	271	/* Queue management functions */
	272
1da177e4 LT	273	int autofs4_wait(struct autofs_sb_info ,struct dentry , enum autofs_notify);
	274	int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
	275	void autofs4_catatonic_mode(struct autofs_sb_info *);
	276
5c0a32fc IK	277	static inline u32 autofs4_get_dev(struct autofs_sb_info *sbi)
	278	{
	279	return new_encode_dev(sbi->sb->s_dev);
	280	}
	281
	282	static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi)
	283	{
	284	return sbi->sb->s_root->d_inode->i_ino;
	285	}
	286
1da177e4 LT	287	static inline int simple_positive(struct dentry *dentry)
	288	{
	289	return dentry->d_inode && !d_unhashed(dentry);
	290	}
	291
2fd6b7f5 NP	292	static inline void __autofs4_add_expiring(struct dentry *dentry)
	293	{
	294	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
	295	struct autofs_info *ino = autofs4_dentry_ino(dentry);
	296	if (ino) {
	297	if (list_empty(&ino->expiring))
	298	list_add(&ino->expiring, &sbi->expiring_list);
	299	}
	300	return;
	301	}
	302
c4cd70b3 IK	303	static inline void autofs4_add_expiring(struct dentry *dentry)
	304	{
	305	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
	306	struct autofs_info *ino = autofs4_dentry_ino(dentry);
	307	if (ino) {
	308	spin_lock(&sbi->lookup_lock);
	309	if (list_empty(&ino->expiring))
	310	list_add(&ino->expiring, &sbi->expiring_list);
	311	spin_unlock(&sbi->lookup_lock);
	312	}
	313	return;
	314	}
	315
	316	static inline void autofs4_del_expiring(struct dentry *dentry)
	317	{
	318	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
	319	struct autofs_info *ino = autofs4_dentry_ino(dentry);
	320	if (ino) {
	321	spin_lock(&sbi->lookup_lock);
	322	if (!list_empty(&ino->expiring))
	323	list_del_init(&ino->expiring);
	324	spin_unlock(&sbi->lookup_lock);
	325	}
	326	return;
	327	}
	328
6ce31523	329	extern void autofs4_kill_sb(struct super_block *);