[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)

/* 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
	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
1da177e4 LT	64	/* Unified info structure. This is pointed to by both the dentry and
	65	inode structures. Each file in the filesystem has an instance of this
	66	structure. It holds a reference to the dentry, so dentries are never
	67	flushed while the file exists. All name lookups are dealt with at the
	68	dentry level, although the filesystem can interfere in the validation
	69	process. Readdir is implemented by traversing the dentry lists. */
	70	struct autofs_info {
	71	struct dentry *dentry;
	72	struct inode *inode;
	73
	74	int flags;
	75
6e60a9ab IK	76	struct completion expire_complete;
6e60a9ab IK	77
25767378	78	struct list_head active;
4f8427d1 IK	79	int active_count;
4f8427d1 IK	80
5f6f4f28	81	struct list_head expiring;
f50b6f86	82
1da177e4 LT	83	struct autofs_sb_info *sbi;
1da177e4 LT	84	unsigned long last_used;
1aff3c8b	85	atomic_t count;
1da177e4	86
c0f54d3e IK	87	uid_t uid;
c0f54d3e IK	88	gid_t gid;
1da177e4 LT	89	};
	90
	91	#define AUTOFS_INF_EXPIRING (1<<0) /* dentry is in the process of expiring */
aa952eb2	92	#define AUTOFS_INF_PENDING (1<<2) /* dentry pending mount */
1da177e4 LT	93
	94	struct autofs_wait_queue {
	95	wait_queue_head_t queue;
	96	struct autofs_wait_queue *next;
	97	autofs_wqt_t wait_queue_token;
	98	/* We use the following to see what we are waiting for */
70b52a0a	99	struct qstr name;
5c0a32fc IK	100	u32 dev;
	101	u64 ino;
	102	uid_t uid;
	103	gid_t gid;
	104	pid_t pid;
	105	pid_t tgid;
1da177e4 LT	106	/* This is for status reporting upon return */
1da177e4 LT	107	int status;
296f7bf7	108	unsigned int wait_ctr;
1da177e4 LT	109	};
	110
	111	#define AUTOFS_SBI_MAGIC 0x6d4a556d
	112
	113	struct autofs_sb_info {
	114	u32 magic;
d7c4a5f1	115	int pipefd;
1da177e4 LT	116	struct file *pipe;
	117	pid_t oz_pgrp;
	118	int catatonic;
	119	int version;
	120	int sub_version;
d7c4a5f1 IK	121	int min_proto;
d7c4a5f1 IK	122	int max_proto;
1da177e4	123	unsigned long exp_timeout;
34ca959c	124	unsigned int type;
1da177e4 LT	125	int reghost_enabled;
	126	int needs_reghost;
	127	struct super_block *sb;
1d5599e3	128	struct mutex wq_mutex;
3a9720ce	129	spinlock_t fs_lock;
1da177e4	130	struct autofs_wait_queue queues; / Wait queue pointer */
5f6f4f28	131	spinlock_t lookup_lock;
25767378	132	struct list_head active_list;
5f6f4f28	133	struct list_head expiring_list;
1da177e4 LT	134	};
	135
	136	static inline struct autofs_sb_info autofs4_sbi(struct super_block sb)
	137	{
	138	return (struct autofs_sb_info *)(sb->s_fs_info);
	139	}
	140
	141	static inline struct autofs_info autofs4_dentry_ino(struct dentry dentry)
	142	{
	143	return (struct autofs_info *)(dentry->d_fsdata);
	144	}
	145
	146	/* autofs4_oz_mode(): do we see the man behind the curtain? (The
	147	processes which do manipulations for us in user space sees the raw
	148	filesystem without "magic".) */
	149
	150	static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) {
a47afb0f	151	return sbi->catatonic \|\| task_pgrp_nr(current) == sbi->oz_pgrp;
1da177e4 LT	152	}
	153
	154	/* Does a dentry have some pending activity? */
	155	static inline int autofs4_ispending(struct dentry *dentry)
	156	{
	157	struct autofs_info *inf = autofs4_dentry_ino(dentry);
	158
aa952eb2	159	if (inf->flags & AUTOFS_INF_PENDING)
3a9720ce IK	160	return 1;
3a9720ce IK	161
97e7449a IK	162	if (inf->flags & AUTOFS_INF_EXPIRING)
97e7449a IK	163	return 1;
3a9720ce	164
97e7449a	165	return 0;
1da177e4 LT	166	}
1da177e4 LT	167
726a5e06	168	struct inode autofs4_get_inode(struct super_block , mode_t);
1da177e4 LT	169	void autofs4_free_ino(struct autofs_info *);
	170
	171	/* Expiration */
	172	int is_autofs4_dentry(struct dentry *);
06a35985	173	int autofs4_expire_wait(struct dentry *dentry);
1da177e4 LT	174	int autofs4_expire_run(struct super_block , struct vfsmount ,
	175	struct autofs_sb_info *,
	176	struct autofs_packet_expire __user *);
56fcef75 IK	177	int autofs4_do_expire_multi(struct super_block sb, struct vfsmount mnt,
56fcef75 IK	178	struct autofs_sb_info *sbi, int when);
1da177e4 LT	179	int autofs4_expire_multi(struct super_block , struct vfsmount ,
1da177e4 LT	180	struct autofs_sb_info , int __user );
8d7b48e0 IK	181	struct dentry autofs4_expire_direct(struct super_block sb,
	182	struct vfsmount *mnt,
	183	struct autofs_sb_info *sbi, int how);
	184	struct dentry autofs4_expire_indirect(struct super_block sb,
	185	struct vfsmount *mnt,
	186	struct autofs_sb_info *sbi, int how);
	187
	188	/* Device node initialization */
	189
	190	int autofs_dev_ioctl_init(void);
	191	void autofs_dev_ioctl_exit(void);
1da177e4 LT	192
	193	/* Operations structures */
	194
754661f1 AV	195	extern const struct inode_operations autofs4_symlink_inode_operations;
754661f1 AV	196	extern const struct inode_operations autofs4_dir_inode_operations;
4b6f5d20 AV	197	extern const struct file_operations autofs4_dir_operations;
4b6f5d20 AV	198	extern const struct file_operations autofs4_root_operations;
71e469db	199	extern const struct dentry_operations autofs4_dentry_operations;
10584211 IK	200
	201	/* VFS automount flags management functions */
	202
	203	static inline void __managed_dentry_set_automount(struct dentry *dentry)
	204	{
	205	dentry->d_flags \|= DCACHE_NEED_AUTOMOUNT;
	206	}
	207
	208	static inline void managed_dentry_set_automount(struct dentry *dentry)
	209	{
	210	spin_lock(&dentry->d_lock);
	211	__managed_dentry_set_automount(dentry);
	212	spin_unlock(&dentry->d_lock);
	213	}
	214
	215	static inline void __managed_dentry_clear_automount(struct dentry *dentry)
	216	{
	217	dentry->d_flags &= ~DCACHE_NEED_AUTOMOUNT;
	218	}
	219
	220	static inline void managed_dentry_clear_automount(struct dentry *dentry)
	221	{
	222	spin_lock(&dentry->d_lock);
	223	__managed_dentry_clear_automount(dentry);
	224	spin_unlock(&dentry->d_lock);
	225	}
	226
b5b80177 IK	227	static inline void __managed_dentry_set_transit(struct dentry *dentry)
	228	{
	229	dentry->d_flags \|= DCACHE_MANAGE_TRANSIT;
	230	}
	231
	232	static inline void managed_dentry_set_transit(struct dentry *dentry)
	233	{
	234	spin_lock(&dentry->d_lock);
	235	__managed_dentry_set_transit(dentry);
	236	spin_unlock(&dentry->d_lock);
	237	}
	238
	239	static inline void __managed_dentry_clear_transit(struct dentry *dentry)
	240	{
	241	dentry->d_flags &= ~DCACHE_MANAGE_TRANSIT;
	242	}
	243
	244	static inline void managed_dentry_clear_transit(struct dentry *dentry)
	245	{
	246	spin_lock(&dentry->d_lock);
	247	__managed_dentry_clear_transit(dentry);
	248	spin_unlock(&dentry->d_lock);
	249	}
	250
	251	static inline void __managed_dentry_set_managed(struct dentry *dentry)
	252	{
	253	dentry->d_flags \|= (DCACHE_NEED_AUTOMOUNT\|DCACHE_MANAGE_TRANSIT);
	254	}
	255
	256	static inline void managed_dentry_set_managed(struct dentry *dentry)
	257	{
	258	spin_lock(&dentry->d_lock);
	259	__managed_dentry_set_managed(dentry);
	260	spin_unlock(&dentry->d_lock);
	261	}
	262
	263	static inline void __managed_dentry_clear_managed(struct dentry *dentry)
	264	{
	265	dentry->d_flags &= ~(DCACHE_NEED_AUTOMOUNT\|DCACHE_MANAGE_TRANSIT);
	266	}
	267
	268	static inline void managed_dentry_clear_managed(struct dentry *dentry)
	269	{
	270	spin_lock(&dentry->d_lock);
	271	__managed_dentry_clear_managed(dentry);
	272	spin_unlock(&dentry->d_lock);
	273	}
	274
1da177e4 LT	275	/* Initializing function */
	276
	277	int autofs4_fill_super(struct super_block , void , int);
26e6c910 AV	278	struct autofs_info autofs4_new_ino(struct autofs_sb_info );
26e6c910 AV	279	void autofs4_clean_ino(struct autofs_info *);
1da177e4 LT	280
	281	/* Queue management functions */
	282
1da177e4 LT	283	int autofs4_wait(struct autofs_sb_info ,struct dentry , enum autofs_notify);
	284	int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
	285	void autofs4_catatonic_mode(struct autofs_sb_info *);
	286
5c0a32fc IK	287	static inline u32 autofs4_get_dev(struct autofs_sb_info *sbi)
	288	{
	289	return new_encode_dev(sbi->sb->s_dev);
	290	}
	291
	292	static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi)
	293	{
	294	return sbi->sb->s_root->d_inode->i_ino;
	295	}
	296
1da177e4 LT	297	static inline int simple_positive(struct dentry *dentry)
	298	{
	299	return dentry->d_inode && !d_unhashed(dentry);
	300	}
	301
2fd6b7f5 NP	302	static inline void __autofs4_add_expiring(struct dentry *dentry)
	303	{
	304	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
	305	struct autofs_info *ino = autofs4_dentry_ino(dentry);
	306	if (ino) {
	307	if (list_empty(&ino->expiring))
	308	list_add(&ino->expiring, &sbi->expiring_list);
	309	}
	310	return;
	311	}
	312
c4cd70b3 IK	313	static inline void autofs4_add_expiring(struct dentry *dentry)
	314	{
	315	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
	316	struct autofs_info *ino = autofs4_dentry_ino(dentry);
	317	if (ino) {
	318	spin_lock(&sbi->lookup_lock);
	319	if (list_empty(&ino->expiring))
	320	list_add(&ino->expiring, &sbi->expiring_list);
	321	spin_unlock(&sbi->lookup_lock);
	322	}
	323	return;
	324	}
	325
	326	static inline void autofs4_del_expiring(struct dentry *dentry)
	327	{
	328	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
	329	struct autofs_info *ino = autofs4_dentry_ino(dentry);
	330	if (ino) {
	331	spin_lock(&sbi->lookup_lock);
	332	if (!list_empty(&ino->expiring))
	333	list_del_init(&ino->expiring);
	334	spin_unlock(&sbi->lookup_lock);
	335	}
	336	return;
	337	}
	338
6ce31523	339	extern void autofs4_kill_sb(struct super_block *);