[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;
};

#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
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;
c0f54d3e IK	90	gid_t gid;
1da177e4 LT	91	};
	92
	93	#define AUTOFS_INF_EXPIRING (1<<0) /* dentry is in the process of expiring */
aa952eb2	94	#define AUTOFS_INF_PENDING (1<<2) /* dentry pending mount */
1da177e4 LT	95
	96	struct autofs_wait_queue {
	97	wait_queue_head_t queue;
	98	struct autofs_wait_queue *next;
	99	autofs_wqt_t wait_queue_token;
	100	/* We use the following to see what we are waiting for */
70b52a0a	101	struct qstr name;
5c0a32fc IK	102	u32 dev;
	103	u64 ino;
	104	uid_t uid;
	105	gid_t gid;
	106	pid_t pid;
	107	pid_t tgid;
1da177e4 LT	108	/* This is for status reporting upon return */
1da177e4 LT	109	int status;
296f7bf7	110	unsigned int wait_ctr;
1da177e4 LT	111	};
	112
	113	#define AUTOFS_SBI_MAGIC 0x6d4a556d
	114
	115	struct autofs_sb_info {
	116	u32 magic;
d7c4a5f1	117	int pipefd;
1da177e4 LT	118	struct file *pipe;
	119	pid_t oz_pgrp;
	120	int catatonic;
	121	int version;
	122	int sub_version;
d7c4a5f1 IK	123	int min_proto;
d7c4a5f1 IK	124	int max_proto;
1da177e4	125	unsigned long exp_timeout;
34ca959c	126	unsigned int type;
1da177e4 LT	127	int reghost_enabled;
	128	int needs_reghost;
	129	struct super_block *sb;
1d5599e3	130	struct mutex wq_mutex;
3a9720ce	131	spinlock_t fs_lock;
1da177e4	132	struct autofs_wait_queue queues; / Wait queue pointer */
5f6f4f28	133	spinlock_t lookup_lock;
25767378	134	struct list_head active_list;
5f6f4f28	135	struct list_head expiring_list;
1da177e4 LT	136	};
	137
	138	static inline struct autofs_sb_info autofs4_sbi(struct super_block sb)
	139	{
	140	return (struct autofs_sb_info *)(sb->s_fs_info);
	141	}
	142
	143	static inline struct autofs_info autofs4_dentry_ino(struct dentry dentry)
	144	{
	145	return (struct autofs_info *)(dentry->d_fsdata);
	146	}
	147
	148	/* autofs4_oz_mode(): do we see the man behind the curtain? (The
	149	processes which do manipulations for us in user space sees the raw
	150	filesystem without "magic".) */
	151
	152	static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) {
a47afb0f	153	return sbi->catatonic \|\| task_pgrp_nr(current) == sbi->oz_pgrp;
1da177e4 LT	154	}
	155
	156	/* Does a dentry have some pending activity? */
	157	static inline int autofs4_ispending(struct dentry *dentry)
	158	{
	159	struct autofs_info *inf = autofs4_dentry_ino(dentry);
	160
aa952eb2	161	if (inf->flags & AUTOFS_INF_PENDING)
3a9720ce IK	162	return 1;
3a9720ce IK	163
97e7449a IK	164	if (inf->flags & AUTOFS_INF_EXPIRING)
97e7449a IK	165	return 1;
3a9720ce	166
97e7449a	167	return 0;
1da177e4 LT	168	}
1da177e4 LT	169
726a5e06	170	struct inode autofs4_get_inode(struct super_block , mode_t);
1da177e4 LT	171	void autofs4_free_ino(struct autofs_info *);
	172
	173	/* Expiration */
	174	int is_autofs4_dentry(struct dentry *);
06a35985	175	int autofs4_expire_wait(struct dentry *dentry);
1da177e4 LT	176	int autofs4_expire_run(struct super_block , struct vfsmount ,
	177	struct autofs_sb_info *,
	178	struct autofs_packet_expire __user *);
56fcef75 IK	179	int autofs4_do_expire_multi(struct super_block sb, struct vfsmount mnt,
56fcef75 IK	180	struct autofs_sb_info *sbi, int when);
1da177e4 LT	181	int autofs4_expire_multi(struct super_block , struct vfsmount ,
1da177e4 LT	182	struct autofs_sb_info , int __user );
8d7b48e0 IK	183	struct dentry autofs4_expire_direct(struct super_block sb,
	184	struct vfsmount *mnt,
	185	struct autofs_sb_info *sbi, int how);
	186	struct dentry autofs4_expire_indirect(struct super_block sb,
	187	struct vfsmount *mnt,
	188	struct autofs_sb_info *sbi, int how);
	189
	190	/* Device node initialization */
	191
	192	int autofs_dev_ioctl_init(void);
	193	void autofs_dev_ioctl_exit(void);
1da177e4 LT	194
	195	/* Operations structures */
	196
754661f1 AV	197	extern const struct inode_operations autofs4_symlink_inode_operations;
754661f1 AV	198	extern const struct inode_operations autofs4_dir_inode_operations;
4b6f5d20 AV	199	extern const struct file_operations autofs4_dir_operations;
4b6f5d20 AV	200	extern const struct file_operations autofs4_root_operations;
71e469db	201	extern const struct dentry_operations autofs4_dentry_operations;
10584211 IK	202
	203	/* VFS automount flags management functions */
	204
	205	static inline void __managed_dentry_set_automount(struct dentry *dentry)
	206	{
	207	dentry->d_flags \|= DCACHE_NEED_AUTOMOUNT;
	208	}
	209
	210	static inline void managed_dentry_set_automount(struct dentry *dentry)
	211	{
	212	spin_lock(&dentry->d_lock);
	213	__managed_dentry_set_automount(dentry);
	214	spin_unlock(&dentry->d_lock);
	215	}
	216
	217	static inline void __managed_dentry_clear_automount(struct dentry *dentry)
	218	{
	219	dentry->d_flags &= ~DCACHE_NEED_AUTOMOUNT;
	220	}
	221
	222	static inline void managed_dentry_clear_automount(struct dentry *dentry)
	223	{
	224	spin_lock(&dentry->d_lock);
	225	__managed_dentry_clear_automount(dentry);
	226	spin_unlock(&dentry->d_lock);
	227	}
	228
b5b80177 IK	229	static inline void __managed_dentry_set_transit(struct dentry *dentry)
	230	{
	231	dentry->d_flags \|= DCACHE_MANAGE_TRANSIT;
	232	}
	233
	234	static inline void managed_dentry_set_transit(struct dentry *dentry)
	235	{
	236	spin_lock(&dentry->d_lock);
	237	__managed_dentry_set_transit(dentry);
	238	spin_unlock(&dentry->d_lock);
	239	}
	240
	241	static inline void __managed_dentry_clear_transit(struct dentry *dentry)
	242	{
	243	dentry->d_flags &= ~DCACHE_MANAGE_TRANSIT;
	244	}
	245
	246	static inline void managed_dentry_clear_transit(struct dentry *dentry)
	247	{
	248	spin_lock(&dentry->d_lock);
	249	__managed_dentry_clear_transit(dentry);
	250	spin_unlock(&dentry->d_lock);
	251	}
	252
	253	static inline void __managed_dentry_set_managed(struct dentry *dentry)
	254	{
	255	dentry->d_flags \|= (DCACHE_NEED_AUTOMOUNT\|DCACHE_MANAGE_TRANSIT);
	256	}
	257
	258	static inline void managed_dentry_set_managed(struct dentry *dentry)
	259	{
	260	spin_lock(&dentry->d_lock);
	261	__managed_dentry_set_managed(dentry);
	262	spin_unlock(&dentry->d_lock);
	263	}
	264
	265	static inline void __managed_dentry_clear_managed(struct dentry *dentry)
	266	{
	267	dentry->d_flags &= ~(DCACHE_NEED_AUTOMOUNT\|DCACHE_MANAGE_TRANSIT);
	268	}
	269
	270	static inline void managed_dentry_clear_managed(struct dentry *dentry)
	271	{
	272	spin_lock(&dentry->d_lock);
	273	__managed_dentry_clear_managed(dentry);
	274	spin_unlock(&dentry->d_lock);
	275	}
	276
1da177e4 LT	277	/* Initializing function */
	278
	279	int autofs4_fill_super(struct super_block , void , int);
26e6c910 AV	280	struct autofs_info autofs4_new_ino(struct autofs_sb_info );
26e6c910 AV	281	void autofs4_clean_ino(struct autofs_info *);
1da177e4 LT	282
	283	/* Queue management functions */
	284
1da177e4 LT	285	int autofs4_wait(struct autofs_sb_info ,struct dentry , enum autofs_notify);
	286	int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
	287	void autofs4_catatonic_mode(struct autofs_sb_info *);
	288
5c0a32fc IK	289	static inline u32 autofs4_get_dev(struct autofs_sb_info *sbi)
	290	{
	291	return new_encode_dev(sbi->sb->s_dev);
	292	}
	293
	294	static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi)
	295	{
	296	return sbi->sb->s_root->d_inode->i_ino;
	297	}
	298
1da177e4 LT	299	static inline int simple_positive(struct dentry *dentry)
	300	{
	301	return dentry->d_inode && !d_unhashed(dentry);
	302	}
	303
2fd6b7f5 NP	304	static inline void __autofs4_add_expiring(struct dentry *dentry)
	305	{
	306	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
	307	struct autofs_info *ino = autofs4_dentry_ino(dentry);
	308	if (ino) {
	309	if (list_empty(&ino->expiring))
	310	list_add(&ino->expiring, &sbi->expiring_list);
	311	}
	312	return;
	313	}
	314
c4cd70b3 IK	315	static inline void autofs4_add_expiring(struct dentry *dentry)
	316	{
	317	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
	318	struct autofs_info *ino = autofs4_dentry_ino(dentry);
	319	if (ino) {
	320	spin_lock(&sbi->lookup_lock);
	321	if (list_empty(&ino->expiring))
	322	list_add(&ino->expiring, &sbi->expiring_list);
	323	spin_unlock(&sbi->lookup_lock);
	324	}
	325	return;
	326	}
	327
	328	static inline void autofs4_del_expiring(struct dentry *dentry)
	329	{
	330	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
	331	struct autofs_info *ino = autofs4_dentry_ino(dentry);
	332	if (ino) {
	333	spin_lock(&sbi->lookup_lock);
	334	if (!list_empty(&ino->expiring))
	335	list_del_init(&ino->expiring);
	336	spin_unlock(&sbi->lookup_lock);
	337	}
	338	return;
	339	}
	340
6ce31523	341	extern void autofs4_kill_sb(struct super_block *);