[deliverable/linux.git] / fs / mount.h

#include <linux/mount.h>
#include <linux/seq_file.h>
#include <linux/poll.h>
#include <linux/ns_common.h>
#include <linux/fs_pin.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 fs_pin mnt_umount;
	struct dentry *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 int __legitimize_mnt(struct vfsmount *, unsigned);
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 mnt_namespace *ns;
	struct path root;
	int (*show)(struct seq_file *, struct vfsmount *);
	void *cached_mount;
	u64 cached_event;
	loff_t cached_index;
};

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
b2dba1af	1	#include <linux/mount.h>
0226f492 AV	2	#include <linux/seq_file.h>
0226f492 AV	3	#include <linux/poll.h>
435d5f4b	4	#include <linux/ns_common.h>
87b95ce0	5	#include <linux/fs_pin.h>
0226f492 AV	6
	7	struct mnt_namespace {
	8	atomic_t count;
435d5f4b	9	struct ns_common ns;
be08d6d2	10	struct mount * root;
0226f492	11	struct list_head list;
771b1371	12	struct user_namespace *user_ns;
8823c079	13	u64 seq; /* Sequence number to prevent loops */
0226f492	14	wait_queue_head_t poll;
c7999c36	15	u64 event;
0226f492	16	};
b2dba1af	17
68e8a9fe AV	18	struct mnt_pcp {
	19	int mnt_count;
	20	int mnt_writers;
	21	};
	22
84d17192	23	struct mountpoint {
0818bf27	24	struct hlist_node m_hash;
84d17192	25	struct dentry *m_dentry;
0a5eb7c8	26	struct hlist_head m_list;
84d17192 AV	27	int m_count;
	28	};
	29
7d6fec45	30	struct mount {
38129a13	31	struct hlist_node mnt_hash;
0714a533	32	struct mount *mnt_parent;
a73324da	33	struct dentry *mnt_mountpoint;
7d6fec45	34	struct vfsmount mnt;
9ea459e1 AV	35	union {
	36	struct rcu_head mnt_rcu;
	37	struct llist_node mnt_llist;
	38	};
68e8a9fe AV	39	#ifdef CONFIG_SMP
68e8a9fe AV	40	struct mnt_pcp __percpu *mnt_pcp;
68e8a9fe AV	41	#else
	42	int mnt_count;
	43	int mnt_writers;
	44	#endif
6b41d536 AV	45	struct list_head mnt_mounts; /* list of children, anchored here */
6b41d536 AV	46	struct list_head mnt_child; /* and going through their mnt_child */
39f7c4db	47	struct list_head mnt_instance; /* mount instance on sb->s_mounts */
52ba1621	48	const char mnt_devname; / Name of device e.g. /dev/dsk/hda1 */
1a4eeaf2	49	struct list_head mnt_list;
6776db3d AV	50	struct list_head mnt_expire; /* link in fs-specific expiry list */
	51	struct list_head mnt_share; /* circular list of shared mounts */
	52	struct list_head mnt_slave_list;/* list of slave mounts */
	53	struct list_head mnt_slave; /* slave list entry */
32301920	54	struct mount mnt_master; / slave is on master->mnt_slave_list */
143c8c91	55	struct mnt_namespace mnt_ns; / containing namespace */
84d17192	56	struct mountpoint mnt_mp; / where is it mounted */
0a5eb7c8	57	struct hlist_node mnt_mp_list; /* list mounts with the same mountpoint */
c63181e6 AV	58	#ifdef CONFIG_FSNOTIFY
	59	struct hlist_head mnt_fsnotify_marks;
	60	__u32 mnt_fsnotify_mask;
	61	#endif
15169fe7 AV	62	int mnt_id; /* mount identifier */
15169fe7 AV	63	int mnt_group_id; /* peer group identifier */
863d684f	64	int mnt_expiry_mark; /* true if marked for expiry */
215752fc	65	struct hlist_head mnt_pins;
87b95ce0 AV	66	struct fs_pin mnt_umount;
87b95ce0 AV	67	struct dentry *mnt_ex_mountpoint;
7d6fec45 AV	68	};
7d6fec45 AV	69
f7a99c5b AV	70	#define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */
f7a99c5b AV	71
7d6fec45 AV	72	static inline struct mount real_mount(struct vfsmount mnt)
	73	{
	74	return container_of(mnt, struct mount, mnt);
	75	}
	76
676da58d	77	static inline int mnt_has_parent(struct mount *mnt)
b2dba1af	78	{
0714a533	79	return mnt != mnt->mnt_parent;
b2dba1af	80	}
c7105365	81
f7a99c5b AV	82	static inline int is_mounted(struct vfsmount *mnt)
	83	{
	84	/* neither detached nor internal? */
260a459d	85	return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns);
f7a99c5b AV	86	}
f7a99c5b AV	87
474279dc AV	88	extern struct mount __lookup_mnt(struct vfsmount , struct dentry *);
474279dc AV	89	extern struct mount __lookup_mnt_last(struct vfsmount , struct dentry *);
0226f492	90
294d71ff	91	extern int __legitimize_mnt(struct vfsmount *, unsigned);
48a066e7 AV	92	extern bool legitimize_mnt(struct vfsmount *, unsigned);
48a066e7 AV	93
80b5dce8 EB	94	extern void __detach_mounts(struct dentry *dentry);
	95
	96	static inline void detach_mounts(struct dentry *dentry)
	97	{
	98	if (!d_mountpoint(dentry))
	99	return;
	100	__detach_mounts(dentry);
	101	}
	102
0226f492 AV	103	static inline void get_mnt_ns(struct mnt_namespace *ns)
	104	{
	105	atomic_inc(&ns->count);
	106	}
	107
48a066e7	108	extern seqlock_t mount_lock;
719ea2fb AV	109
	110	static inline void lock_mount_hash(void)
	111	{
48a066e7	112	write_seqlock(&mount_lock);
719ea2fb AV	113	}
	114
	115	static inline void unlock_mount_hash(void)
	116	{
48a066e7	117	write_sequnlock(&mount_lock);
719ea2fb AV	118	}
719ea2fb AV	119
0226f492	120	struct proc_mounts {
0226f492 AV	121	struct mnt_namespace *ns;
	122	struct path root;
	123	int (show)(struct seq_file , struct vfsmount *);
c7999c36 AV	124	void *cached_mount;
	125	u64 cached_event;
	126	loff_t cached_index;
0226f492 AV	127	};
	128
	129	extern const struct seq_operations mounts_op;
7af1364f EB	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	}