[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 */

#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;

	kuid_t uid;
	kgid_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;
	kuid_t uid;
	kgid_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;
	struct mutex pipe_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;
	struct rcu_head rcu;
};

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 *, umode_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 *);

static inline int autofs_prepare_pipe(struct file *pipe)
{
	if (!pipe->f_op->write)
		return -EINVAL;
	if (!S_ISFIFO(file_inode(pipe)->i_mode))
		return -EINVAL;
	/* We want a packet pipe */
	pipe->f_flags |= O_DIRECT;
	return 0;
}

/* 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
45634cd8 EB	77	kuid_t uid;
45634cd8 EB	78	kgid_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;
5c0a32fc IK	91	u64 ino;
45634cd8 EB	92	kuid_t uid;
45634cd8 EB	93	kgid_t gid;
5c0a32fc IK	94	pid_t pid;
5c0a32fc IK	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;
d668dc56	119	struct mutex pipe_mutex;
3a9720ce	120	spinlock_t fs_lock;
1da177e4	121	struct autofs_wait_queue queues; / Wait queue pointer */
5f6f4f28	122	spinlock_t lookup_lock;
25767378	123	struct list_head active_list;
5f6f4f28	124	struct list_head expiring_list;
baa40671	125	struct rcu_head rcu;
1da177e4 LT	126	};
	127
	128	static inline struct autofs_sb_info autofs4_sbi(struct super_block sb)
	129	{
	130	return (struct autofs_sb_info *)(sb->s_fs_info);
	131	}
	132
	133	static inline struct autofs_info autofs4_dentry_ino(struct dentry dentry)
	134	{
	135	return (struct autofs_info *)(dentry->d_fsdata);
	136	}
	137
	138	/* autofs4_oz_mode(): do we see the man behind the curtain? (The
	139	processes which do manipulations for us in user space sees the raw
	140	filesystem without "magic".) */
	141
	142	static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) {
a47afb0f	143	return sbi->catatonic \|\| task_pgrp_nr(current) == sbi->oz_pgrp;
1da177e4 LT	144	}
	145
	146	/* Does a dentry have some pending activity? */
	147	static inline int autofs4_ispending(struct dentry *dentry)
	148	{
	149	struct autofs_info *inf = autofs4_dentry_ino(dentry);
	150
aa952eb2	151	if (inf->flags & AUTOFS_INF_PENDING)
3a9720ce IK	152	return 1;
3a9720ce IK	153
97e7449a IK	154	if (inf->flags & AUTOFS_INF_EXPIRING)
97e7449a IK	155	return 1;
3a9720ce	156
97e7449a	157	return 0;
1da177e4 LT	158	}
1da177e4 LT	159
030a8ba4	160	struct inode autofs4_get_inode(struct super_block , umode_t);
1da177e4 LT	161	void autofs4_free_ino(struct autofs_info *);
	162
	163	/* Expiration */
	164	int is_autofs4_dentry(struct dentry *);
06a35985	165	int autofs4_expire_wait(struct dentry *dentry);
1da177e4 LT	166	int autofs4_expire_run(struct super_block , struct vfsmount ,
	167	struct autofs_sb_info *,
	168	struct autofs_packet_expire __user *);
56fcef75 IK	169	int autofs4_do_expire_multi(struct super_block sb, struct vfsmount mnt,
56fcef75 IK	170	struct autofs_sb_info *sbi, int when);
1da177e4 LT	171	int autofs4_expire_multi(struct super_block , struct vfsmount ,
1da177e4 LT	172	struct autofs_sb_info , int __user );
8d7b48e0 IK	173	struct dentry autofs4_expire_direct(struct super_block sb,
	174	struct vfsmount *mnt,
	175	struct autofs_sb_info *sbi, int how);
	176	struct dentry autofs4_expire_indirect(struct super_block sb,
	177	struct vfsmount *mnt,
	178	struct autofs_sb_info *sbi, int how);
	179
	180	/* Device node initialization */
	181
	182	int autofs_dev_ioctl_init(void);
	183	void autofs_dev_ioctl_exit(void);
1da177e4 LT	184
	185	/* Operations structures */
	186
754661f1 AV	187	extern const struct inode_operations autofs4_symlink_inode_operations;
754661f1 AV	188	extern const struct inode_operations autofs4_dir_inode_operations;
4b6f5d20 AV	189	extern const struct file_operations autofs4_dir_operations;
4b6f5d20 AV	190	extern const struct file_operations autofs4_root_operations;
71e469db	191	extern const struct dentry_operations autofs4_dentry_operations;
10584211 IK	192
	193	/* VFS automount flags management functions */
	194
	195	static inline void __managed_dentry_set_automount(struct dentry *dentry)
	196	{
	197	dentry->d_flags \|= DCACHE_NEED_AUTOMOUNT;
	198	}
	199
	200	static inline void managed_dentry_set_automount(struct dentry *dentry)
	201	{
	202	spin_lock(&dentry->d_lock);
	203	__managed_dentry_set_automount(dentry);
	204	spin_unlock(&dentry->d_lock);
	205	}
	206
	207	static inline void __managed_dentry_clear_automount(struct dentry *dentry)
	208	{
	209	dentry->d_flags &= ~DCACHE_NEED_AUTOMOUNT;
	210	}
	211
	212	static inline void managed_dentry_clear_automount(struct dentry *dentry)
	213	{
	214	spin_lock(&dentry->d_lock);
	215	__managed_dentry_clear_automount(dentry);
	216	spin_unlock(&dentry->d_lock);
	217	}
	218
b5b80177 IK	219	static inline void __managed_dentry_set_transit(struct dentry *dentry)
	220	{
	221	dentry->d_flags \|= DCACHE_MANAGE_TRANSIT;
	222	}
	223
	224	static inline void managed_dentry_set_transit(struct dentry *dentry)
	225	{
	226	spin_lock(&dentry->d_lock);
	227	__managed_dentry_set_transit(dentry);
	228	spin_unlock(&dentry->d_lock);
	229	}
	230
	231	static inline void __managed_dentry_clear_transit(struct dentry *dentry)
	232	{
	233	dentry->d_flags &= ~DCACHE_MANAGE_TRANSIT;
	234	}
	235
	236	static inline void managed_dentry_clear_transit(struct dentry *dentry)
	237	{
	238	spin_lock(&dentry->d_lock);
	239	__managed_dentry_clear_transit(dentry);
	240	spin_unlock(&dentry->d_lock);
	241	}
	242
	243	static inline void __managed_dentry_set_managed(struct dentry *dentry)
	244	{
	245	dentry->d_flags \|= (DCACHE_NEED_AUTOMOUNT\|DCACHE_MANAGE_TRANSIT);
	246	}
	247
	248	static inline void managed_dentry_set_managed(struct dentry *dentry)
	249	{
	250	spin_lock(&dentry->d_lock);
	251	__managed_dentry_set_managed(dentry);
	252	spin_unlock(&dentry->d_lock);
	253	}
	254
	255	static inline void __managed_dentry_clear_managed(struct dentry *dentry)
	256	{
	257	dentry->d_flags &= ~(DCACHE_NEED_AUTOMOUNT\|DCACHE_MANAGE_TRANSIT);
	258	}
	259
	260	static inline void managed_dentry_clear_managed(struct dentry *dentry)
	261	{
	262	spin_lock(&dentry->d_lock);
	263	__managed_dentry_clear_managed(dentry);
	264	spin_unlock(&dentry->d_lock);
	265	}
	266
1da177e4 LT	267	/* Initializing function */
	268
	269	int autofs4_fill_super(struct super_block , void , int);
26e6c910 AV	270	struct autofs_info autofs4_new_ino(struct autofs_sb_info );
26e6c910 AV	271	void autofs4_clean_ino(struct autofs_info *);
1da177e4	272
64f371bc LT	273	static inline int autofs_prepare_pipe(struct file *pipe)
64f371bc LT	274	{
72c2d531	275	if (!pipe->f_op->write)
64f371bc	276	return -EINVAL;
496ad9aa	277	if (!S_ISFIFO(file_inode(pipe)->i_mode))
64f371bc LT	278	return -EINVAL;
	279	/* We want a packet pipe */
	280	pipe->f_flags \|= O_DIRECT;
	281	return 0;
	282	}
	283
1da177e4 LT	284	/* Queue management functions */
1da177e4 LT	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
6ce31523	342	extern void autofs4_kill_sb(struct super_block *);