[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / fs / mount.h

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

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