[deliverable/linux.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 */

#ifdef DEBUG
#define DPRINTK(fmt, args...)				\
do {							\
	printk(KERN_DEBUG "pid %d: %s: " fmt "\n",	\
		current->pid, __func__, ##args);	\
} while (0)
#else
#define DPRINTK(fmt, args...) do {} while (0)
#endif

#define AUTOFS_WARN(fmt, args...)			\
do {							\
	printk(KERN_WARNING "pid %d: %s: " fmt "\n",	\
		current->pid, __func__, ##args);	\
} while (0)

#define AUTOFS_ERROR(fmt, args...)			\
do {							\
	printk(KERN_ERR "pid %d: %s: " fmt "\n",	\
		current->pid, __func__, ##args);	\
} while (0)

extern spinlock_t autofs4_lock;

/* 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;

	size_t	size;
};

#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 *, struct autofs_info *, 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_init_ino(struct autofs_info *, struct autofs_sb_info *sbi);

/* 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;
}

void autofs4_dentry_release(struct dentry *);
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
	42	#ifdef DEBUG
8d7b48e0 IK	43	#define DPRINTK(fmt, args...) \
	44	do { \
	45	printk(KERN_DEBUG "pid %d: %s: " fmt "\n", \
	46	current->pid, __func__, ##args); \
	47	} while (0)
1da177e4	48	#else
8d7b48e0	49	#define DPRINTK(fmt, args...) do {} while (0)
1da177e4 LT	50	#endif
1da177e4 LT	51
8d7b48e0 IK	52	#define AUTOFS_WARN(fmt, args...) \
	53	do { \
	54	printk(KERN_WARNING "pid %d: %s: " fmt "\n", \
	55	current->pid, __func__, ##args); \
	56	} while (0)
	57
	58	#define AUTOFS_ERROR(fmt, args...) \
	59	do { \
	60	printk(KERN_ERR "pid %d: %s: " fmt "\n", \
	61	current->pid, __func__, ##args); \
	62	} while (0)
	63
b5c84bf6 NP	64	extern spinlock_t autofs4_lock;
b5c84bf6 NP	65
1da177e4 LT	66	/* Unified info structure. This is pointed to by both the dentry and
	67	inode structures. Each file in the filesystem has an instance of this
	68	structure. It holds a reference to the dentry, so dentries are never
	69	flushed while the file exists. All name lookups are dealt with at the
	70	dentry level, although the filesystem can interfere in the validation
	71	process. Readdir is implemented by traversing the dentry lists. */
	72	struct autofs_info {
	73	struct dentry *dentry;
	74	struct inode *inode;
	75
	76	int flags;
	77
6e60a9ab IK	78	struct completion expire_complete;
6e60a9ab IK	79
25767378	80	struct list_head active;
4f8427d1 IK	81	int active_count;
4f8427d1 IK	82
5f6f4f28	83	struct list_head expiring;
f50b6f86	84
1da177e4 LT	85	struct autofs_sb_info *sbi;
1da177e4 LT	86	unsigned long last_used;
1aff3c8b	87	atomic_t count;
1da177e4	88
c0f54d3e IK	89	uid_t uid;
	90	gid_t gid;
	91
1da177e4	92	size_t size;
1da177e4 LT	93	};
	94
	95	#define AUTOFS_INF_EXPIRING (1<<0) /* dentry is in the process of expiring */
aa952eb2	96	#define AUTOFS_INF_PENDING (1<<2) /* dentry pending mount */
1da177e4 LT	97
	98	struct autofs_wait_queue {
	99	wait_queue_head_t queue;
	100	struct autofs_wait_queue *next;
	101	autofs_wqt_t wait_queue_token;
	102	/* We use the following to see what we are waiting for */
70b52a0a	103	struct qstr name;
5c0a32fc IK	104	u32 dev;
	105	u64 ino;
	106	uid_t uid;
	107	gid_t gid;
	108	pid_t pid;
	109	pid_t tgid;
1da177e4 LT	110	/* This is for status reporting upon return */
1da177e4 LT	111	int status;
296f7bf7	112	unsigned int wait_ctr;
1da177e4 LT	113	};
	114
	115	#define AUTOFS_SBI_MAGIC 0x6d4a556d
	116
	117	struct autofs_sb_info {
	118	u32 magic;
d7c4a5f1	119	int pipefd;
1da177e4 LT	120	struct file *pipe;
	121	pid_t oz_pgrp;
	122	int catatonic;
	123	int version;
	124	int sub_version;
d7c4a5f1 IK	125	int min_proto;
d7c4a5f1 IK	126	int max_proto;
1da177e4	127	unsigned long exp_timeout;
34ca959c	128	unsigned int type;
1da177e4 LT	129	int reghost_enabled;
	130	int needs_reghost;
	131	struct super_block *sb;
1d5599e3	132	struct mutex wq_mutex;
3a9720ce	133	spinlock_t fs_lock;
1da177e4	134	struct autofs_wait_queue queues; / Wait queue pointer */
5f6f4f28	135	spinlock_t lookup_lock;
25767378	136	struct list_head active_list;
5f6f4f28	137	struct list_head expiring_list;
1da177e4 LT	138	};
	139
	140	static inline struct autofs_sb_info autofs4_sbi(struct super_block sb)
	141	{
	142	return (struct autofs_sb_info *)(sb->s_fs_info);
	143	}
	144
	145	static inline struct autofs_info autofs4_dentry_ino(struct dentry dentry)
	146	{
	147	return (struct autofs_info *)(dentry->d_fsdata);
	148	}
	149
	150	/* autofs4_oz_mode(): do we see the man behind the curtain? (The
	151	processes which do manipulations for us in user space sees the raw
	152	filesystem without "magic".) */
	153
	154	static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) {
a47afb0f	155	return sbi->catatonic \|\| task_pgrp_nr(current) == sbi->oz_pgrp;
1da177e4 LT	156	}
	157
	158	/* Does a dentry have some pending activity? */
	159	static inline int autofs4_ispending(struct dentry *dentry)
	160	{
	161	struct autofs_info *inf = autofs4_dentry_ino(dentry);
	162
aa952eb2	163	if (inf->flags & AUTOFS_INF_PENDING)
3a9720ce IK	164	return 1;
3a9720ce IK	165
97e7449a IK	166	if (inf->flags & AUTOFS_INF_EXPIRING)
97e7449a IK	167	return 1;
3a9720ce	168
97e7449a	169	return 0;
1da177e4 LT	170	}
1da177e4 LT	171
09f12c03	172	struct inode autofs4_get_inode(struct super_block , struct autofs_info *, mode_t);
1da177e4 LT	173	void autofs4_free_ino(struct autofs_info *);
	174
	175	/* Expiration */
	176	int is_autofs4_dentry(struct dentry *);
06a35985	177	int autofs4_expire_wait(struct dentry *dentry);
1da177e4 LT	178	int autofs4_expire_run(struct super_block , struct vfsmount ,
	179	struct autofs_sb_info *,
	180	struct autofs_packet_expire __user *);
56fcef75 IK	181	int autofs4_do_expire_multi(struct super_block sb, struct vfsmount mnt,
56fcef75 IK	182	struct autofs_sb_info *sbi, int when);
1da177e4 LT	183	int autofs4_expire_multi(struct super_block , struct vfsmount ,
1da177e4 LT	184	struct autofs_sb_info , int __user );
8d7b48e0 IK	185	struct dentry autofs4_expire_direct(struct super_block sb,
	186	struct vfsmount *mnt,
	187	struct autofs_sb_info *sbi, int how);
	188	struct dentry autofs4_expire_indirect(struct super_block sb,
	189	struct vfsmount *mnt,
	190	struct autofs_sb_info *sbi, int how);
	191
	192	/* Device node initialization */
	193
	194	int autofs_dev_ioctl_init(void);
	195	void autofs_dev_ioctl_exit(void);
1da177e4 LT	196
	197	/* Operations structures */
	198
754661f1 AV	199	extern const struct inode_operations autofs4_symlink_inode_operations;
754661f1 AV	200	extern const struct inode_operations autofs4_dir_inode_operations;
4b6f5d20 AV	201	extern const struct file_operations autofs4_dir_operations;
4b6f5d20 AV	202	extern const struct file_operations autofs4_root_operations;
71e469db	203	extern const struct dentry_operations autofs4_dentry_operations;
10584211 IK	204
	205	/* VFS automount flags management functions */
	206
	207	static inline void __managed_dentry_set_automount(struct dentry *dentry)
	208	{
	209	dentry->d_flags \|= DCACHE_NEED_AUTOMOUNT;
	210	}
	211
	212	static inline void managed_dentry_set_automount(struct dentry *dentry)
	213	{
	214	spin_lock(&dentry->d_lock);
	215	__managed_dentry_set_automount(dentry);
	216	spin_unlock(&dentry->d_lock);
	217	}
	218
	219	static inline void __managed_dentry_clear_automount(struct dentry *dentry)
	220	{
	221	dentry->d_flags &= ~DCACHE_NEED_AUTOMOUNT;
	222	}
	223
	224	static inline void managed_dentry_clear_automount(struct dentry *dentry)
	225	{
	226	spin_lock(&dentry->d_lock);
	227	__managed_dentry_clear_automount(dentry);
	228	spin_unlock(&dentry->d_lock);
	229	}
	230
b5b80177 IK	231	static inline void __managed_dentry_set_transit(struct dentry *dentry)
	232	{
	233	dentry->d_flags \|= DCACHE_MANAGE_TRANSIT;
	234	}
	235
	236	static inline void managed_dentry_set_transit(struct dentry *dentry)
	237	{
	238	spin_lock(&dentry->d_lock);
	239	__managed_dentry_set_transit(dentry);
	240	spin_unlock(&dentry->d_lock);
	241	}
	242
	243	static inline void __managed_dentry_clear_transit(struct dentry *dentry)
	244	{
	245	dentry->d_flags &= ~DCACHE_MANAGE_TRANSIT;
	246	}
	247
	248	static inline void managed_dentry_clear_transit(struct dentry *dentry)
	249	{
	250	spin_lock(&dentry->d_lock);
	251	__managed_dentry_clear_transit(dentry);
	252	spin_unlock(&dentry->d_lock);
	253	}
	254
	255	static inline void __managed_dentry_set_managed(struct dentry *dentry)
	256	{
	257	dentry->d_flags \|= (DCACHE_NEED_AUTOMOUNT\|DCACHE_MANAGE_TRANSIT);
	258	}
	259
	260	static inline void managed_dentry_set_managed(struct dentry *dentry)
	261	{
	262	spin_lock(&dentry->d_lock);
	263	__managed_dentry_set_managed(dentry);
	264	spin_unlock(&dentry->d_lock);
	265	}
	266
	267	static inline void __managed_dentry_clear_managed(struct dentry *dentry)
	268	{
	269	dentry->d_flags &= ~(DCACHE_NEED_AUTOMOUNT\|DCACHE_MANAGE_TRANSIT);
	270	}
	271
	272	static inline void managed_dentry_clear_managed(struct dentry *dentry)
	273	{
	274	spin_lock(&dentry->d_lock);
	275	__managed_dentry_clear_managed(dentry);
	276	spin_unlock(&dentry->d_lock);
	277	}
	278
1da177e4 LT	279	/* Initializing function */
	280
	281	int autofs4_fill_super(struct super_block , void , int);
09f12c03	282	struct autofs_info autofs4_init_ino(struct autofs_info , struct autofs_sb_info *sbi);
1da177e4 LT	283
	284	/* Queue management functions */
	285
1da177e4 LT	286	int autofs4_wait(struct autofs_sb_info ,struct dentry , enum autofs_notify);
	287	int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
	288	void autofs4_catatonic_mode(struct autofs_sb_info *);
	289
5c0a32fc IK	290	static inline u32 autofs4_get_dev(struct autofs_sb_info *sbi)
	291	{
	292	return new_encode_dev(sbi->sb->s_dev);
	293	}
	294
	295	static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi)
	296	{
	297	return sbi->sb->s_root->d_inode->i_ino;
	298	}
	299
1da177e4 LT	300	static inline int simple_positive(struct dentry *dentry)
	301	{
	302	return dentry->d_inode && !d_unhashed(dentry);
	303	}
	304
2fd6b7f5 NP	305	static inline void __autofs4_add_expiring(struct dentry *dentry)
	306	{
	307	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
	308	struct autofs_info *ino = autofs4_dentry_ino(dentry);
	309	if (ino) {
	310	if (list_empty(&ino->expiring))
	311	list_add(&ino->expiring, &sbi->expiring_list);
	312	}
	313	return;
	314	}
	315
c4cd70b3 IK	316	static inline void autofs4_add_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_add(&ino->expiring, &sbi->expiring_list);
	324	spin_unlock(&sbi->lookup_lock);
	325	}
	326	return;
	327	}
	328
	329	static inline void autofs4_del_expiring(struct dentry *dentry)
	330	{
	331	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
	332	struct autofs_info *ino = autofs4_dentry_ino(dentry);
	333	if (ino) {
	334	spin_lock(&sbi->lookup_lock);
	335	if (!list_empty(&ino->expiring))
	336	list_del_init(&ino->expiring);
	337	spin_unlock(&sbi->lookup_lock);
	338	}
	339	return;
	340	}
	341
f5b95ff0	342	void autofs4_dentry_release(struct dentry *);
6ce31523	343	extern void autofs4_kill_sb(struct super_block *);