[linux-2.6-block.git] / fs / mount.h

#include <linux/mount.h>
#include <linux/seq_file.h>
#include <linux/poll.h>
#include <linux/ns_common.h>

struct mnt_namespace {
	atomic_t		count;
	struct ns_common	ns;
	struct mount *	root;
	struct list_head	list;
	struct user_namespace	*user_ns;
	u64			seq;	/* Sequence number to prevent loops */
	wait_queue_head_t poll;
	u64 event;
};

struct mnt_pcp {
	int mnt_count;
	int mnt_writers;
};

struct mountpoint {
	struct hlist_node m_hash;
	struct dentry *m_dentry;
	struct hlist_head m_list;
	int m_count;
};

struct mount {
	struct hlist_node mnt_hash;
	struct mount *mnt_parent;
	struct dentry *mnt_mountpoint;
	struct vfsmount mnt;
	union {
		struct rcu_head mnt_rcu;
		struct llist_node mnt_llist;
	};
#ifdef CONFIG_SMP
	struct mnt_pcp __percpu *mnt_pcp;
#else
	int mnt_count;
	int mnt_writers;
#endif
	struct list_head mnt_mounts;	/* list of children, anchored here */
	struct list_head mnt_child;	/* and going through their mnt_child */
	struct list_head mnt_instance;	/* mount instance on sb->s_mounts */
	const char *mnt_devname;	/* Name of device e.g. /dev/dsk/hda1 */
	struct list_head mnt_list;
	struct list_head mnt_expire;	/* link in fs-specific expiry list */
	struct list_head mnt_share;	/* circular list of shared mounts */
	struct list_head mnt_slave_list;/* list of slave mounts */
	struct list_head mnt_slave;	/* slave list entry */
	struct mount *mnt_master;	/* slave is on master->mnt_slave_list */
	struct mnt_namespace *mnt_ns;	/* containing namespace */
	struct mountpoint *mnt_mp;	/* where is it mounted */
	struct hlist_node mnt_mp_list;	/* list mounts with the same mountpoint */
#ifdef CONFIG_FSNOTIFY
	struct hlist_head mnt_fsnotify_marks;
	__u32 mnt_fsnotify_mask;
#endif
	int mnt_id;			/* mount identifier */
	int mnt_group_id;		/* peer group identifier */
	int mnt_expiry_mark;		/* true if marked for expiry */
	struct hlist_head mnt_pins;
	struct path mnt_ex_mountpoint;
};

#define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */

static inline struct mount *real_mount(struct vfsmount *mnt)
{
	return container_of(mnt, struct mount, mnt);
}

static inline int mnt_has_parent(struct mount *mnt)
{
	return mnt != mnt->mnt_parent;
}

static inline int is_mounted(struct vfsmount *mnt)
{
	/* neither detached nor internal? */
	return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns);
}

extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *);
extern struct mount *__lookup_mnt_last(struct vfsmount *, struct dentry *);

extern bool legitimize_mnt(struct vfsmount *, unsigned);

extern void __detach_mounts(struct dentry *dentry);

static inline void detach_mounts(struct dentry *dentry)
{
	if (!d_mountpoint(dentry))
		return;
	__detach_mounts(dentry);
}

static inline void get_mnt_ns(struct mnt_namespace *ns)
{
	atomic_inc(&ns->count);
}

extern seqlock_t mount_lock;

static inline void lock_mount_hash(void)
{
	write_seqlock(&mount_lock);
}

static inline void unlock_mount_hash(void)
{
	write_sequnlock(&mount_lock);
}

struct proc_mounts {
	struct seq_file m;
	struct mnt_namespace *ns;
	struct path root;
	int (*show)(struct seq_file *, struct vfsmount *);
	void *cached_mount;
	u64 cached_event;
	loff_t cached_index;
};

#define proc_mounts(p) (container_of((p), struct proc_mounts, m))

extern const struct seq_operations mounts_op;

extern bool __is_local_mountpoint(struct dentry *dentry);
static inline bool is_local_mountpoint(struct dentry *dentry)
{
	if (!d_mountpoint(dentry))
		return false;

	return __is_local_mountpoint(dentry);
}
Commit	Line	Data
	1	#include <linux/mount.h>
	2	#include <linux/seq_file.h>
	3	#include <linux/poll.h>
	4	#include <linux/ns_common.h>
	5
	6	struct mnt_namespace {
	7	atomic_t count;
	8	struct ns_common ns;
	9	struct mount * root;
	10	struct list_head list;
	11	struct user_namespace *user_ns;
	12	u64 seq; /* Sequence number to prevent loops */
	13	wait_queue_head_t poll;
	14	u64 event;
	15	};
	16
	17	struct mnt_pcp {
	18	int mnt_count;
	19	int mnt_writers;
	20	};
	21
	22	struct mountpoint {
	23	struct hlist_node m_hash;
	24	struct dentry *m_dentry;
	25	struct hlist_head m_list;
	26	int m_count;
	27	};
	28
	29	struct mount {
	30	struct hlist_node mnt_hash;
	31	struct mount *mnt_parent;
	32	struct dentry *mnt_mountpoint;
	33	struct vfsmount mnt;
	34	union {
	35	struct rcu_head mnt_rcu;
	36	struct llist_node mnt_llist;
	37	};
	38	#ifdef CONFIG_SMP
	39	struct mnt_pcp __percpu *mnt_pcp;
	40	#else
	41	int mnt_count;
	42	int mnt_writers;
	43	#endif
	44	struct list_head mnt_mounts; /* list of children, anchored here */
	45	struct list_head mnt_child; /* and going through their mnt_child */
	46	struct list_head mnt_instance; /* mount instance on sb->s_mounts */
	47	const char mnt_devname; / Name of device e.g. /dev/dsk/hda1 */
	48	struct list_head mnt_list;
	49	struct list_head mnt_expire; /* link in fs-specific expiry list */
	50	struct list_head mnt_share; /* circular list of shared mounts */
	51	struct list_head mnt_slave_list;/* list of slave mounts */
	52	struct list_head mnt_slave; /* slave list entry */
	53	struct mount mnt_master; / slave is on master->mnt_slave_list */
	54	struct mnt_namespace mnt_ns; / containing namespace */
	55	struct mountpoint mnt_mp; / where is it mounted */
	56	struct hlist_node mnt_mp_list; /* list mounts with the same mountpoint */
	57	#ifdef CONFIG_FSNOTIFY
	58	struct hlist_head mnt_fsnotify_marks;
	59	__u32 mnt_fsnotify_mask;
	60	#endif
	61	int mnt_id; /* mount identifier */
	62	int mnt_group_id; /* peer group identifier */
	63	int mnt_expiry_mark; /* true if marked for expiry */
	64	struct hlist_head mnt_pins;
	65	struct path mnt_ex_mountpoint;
	66	};
	67
	68	#define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */
	69
	70	static inline struct mount real_mount(struct vfsmount mnt)
	71	{
	72	return container_of(mnt, struct mount, mnt);
	73	}
	74
	75	static inline int mnt_has_parent(struct mount *mnt)
	76	{
	77	return mnt != mnt->mnt_parent;
	78	}
	79
	80	static inline int is_mounted(struct vfsmount *mnt)
	81	{
	82	/* neither detached nor internal? */
	83	return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns);
	84	}
	85
	86	extern struct mount __lookup_mnt(struct vfsmount , struct dentry *);
	87	extern struct mount __lookup_mnt_last(struct vfsmount , struct dentry *);
	88
	89	extern bool legitimize_mnt(struct vfsmount *, unsigned);
	90
	91	extern void __detach_mounts(struct dentry *dentry);
	92
	93	static inline void detach_mounts(struct dentry *dentry)
	94	{
	95	if (!d_mountpoint(dentry))
	96	return;
	97	__detach_mounts(dentry);
	98	}
	99
	100	static inline void get_mnt_ns(struct mnt_namespace *ns)
	101	{
	102	atomic_inc(&ns->count);
	103	}
	104
	105	extern seqlock_t mount_lock;
	106
	107	static inline void lock_mount_hash(void)
	108	{
	109	write_seqlock(&mount_lock);
	110	}
	111
	112	static inline void unlock_mount_hash(void)
	113	{
	114	write_sequnlock(&mount_lock);
	115	}
	116
	117	struct proc_mounts {
	118	struct seq_file m;
	119	struct mnt_namespace *ns;
	120	struct path root;
	121	int (show)(struct seq_file , struct vfsmount *);
	122	void *cached_mount;
	123	u64 cached_event;
	124	loff_t cached_index;
	125	};
	126
	127	#define proc_mounts(p) (container_of((p), struct proc_mounts, m))
	128
	129	extern const struct seq_operations mounts_op;
	130
	131	extern bool __is_local_mountpoint(struct dentry *dentry);
	132	static inline bool is_local_mountpoint(struct dentry *dentry)
	133	{
	134	if (!d_mountpoint(dentry))
	135	return false;
	136
	137	return __is_local_mountpoint(dentry);
	138	}