[mirror_ubuntu-hirsute-kernel.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;
	struct ucounts		*ucounts;
	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;
537f7ccb	13	struct ucounts *ucounts;
8823c079	14	u64 seq; /* Sequence number to prevent loops */
0226f492	15	wait_queue_head_t poll;
c7999c36	16	u64 event;
0226f492	17	};
b2dba1af	18
68e8a9fe AV	19	struct mnt_pcp {
	20	int mnt_count;
	21	int mnt_writers;
	22	};
	23
84d17192	24	struct mountpoint {
0818bf27	25	struct hlist_node m_hash;
84d17192	26	struct dentry *m_dentry;
0a5eb7c8	27	struct hlist_head m_list;
84d17192 AV	28	int m_count;
	29	};
	30
7d6fec45	31	struct mount {
38129a13	32	struct hlist_node mnt_hash;
0714a533	33	struct mount *mnt_parent;
a73324da	34	struct dentry *mnt_mountpoint;
7d6fec45	35	struct vfsmount mnt;
9ea459e1 AV	36	union {
	37	struct rcu_head mnt_rcu;
	38	struct llist_node mnt_llist;
	39	};
68e8a9fe AV	40	#ifdef CONFIG_SMP
68e8a9fe AV	41	struct mnt_pcp __percpu *mnt_pcp;
68e8a9fe AV	42	#else
	43	int mnt_count;
	44	int mnt_writers;
	45	#endif
6b41d536 AV	46	struct list_head mnt_mounts; /* list of children, anchored here */
6b41d536 AV	47	struct list_head mnt_child; /* and going through their mnt_child */
39f7c4db	48	struct list_head mnt_instance; /* mount instance on sb->s_mounts */
52ba1621	49	const char mnt_devname; / Name of device e.g. /dev/dsk/hda1 */
1a4eeaf2	50	struct list_head mnt_list;
6776db3d AV	51	struct list_head mnt_expire; /* link in fs-specific expiry list */
	52	struct list_head mnt_share; /* circular list of shared mounts */
	53	struct list_head mnt_slave_list;/* list of slave mounts */
	54	struct list_head mnt_slave; /* slave list entry */
32301920	55	struct mount mnt_master; / slave is on master->mnt_slave_list */
143c8c91	56	struct mnt_namespace mnt_ns; / containing namespace */
84d17192	57	struct mountpoint mnt_mp; / where is it mounted */
0a5eb7c8	58	struct hlist_node mnt_mp_list; /* list mounts with the same mountpoint */
c63181e6 AV	59	#ifdef CONFIG_FSNOTIFY
	60	struct hlist_head mnt_fsnotify_marks;
	61	__u32 mnt_fsnotify_mask;
	62	#endif
15169fe7 AV	63	int mnt_id; /* mount identifier */
15169fe7 AV	64	int mnt_group_id; /* peer group identifier */
863d684f	65	int mnt_expiry_mark; /* true if marked for expiry */
215752fc	66	struct hlist_head mnt_pins;
87b95ce0 AV	67	struct fs_pin mnt_umount;
87b95ce0 AV	68	struct dentry *mnt_ex_mountpoint;
7d6fec45 AV	69	};
7d6fec45 AV	70
f7a99c5b AV	71	#define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */
f7a99c5b AV	72
7d6fec45 AV	73	static inline struct mount real_mount(struct vfsmount mnt)
	74	{
	75	return container_of(mnt, struct mount, mnt);
	76	}
	77
676da58d	78	static inline int mnt_has_parent(struct mount *mnt)
b2dba1af	79	{
0714a533	80	return mnt != mnt->mnt_parent;
b2dba1af	81	}
c7105365	82
f7a99c5b AV	83	static inline int is_mounted(struct vfsmount *mnt)
	84	{
	85	/* neither detached nor internal? */
260a459d	86	return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns);
f7a99c5b AV	87	}
f7a99c5b AV	88
474279dc AV	89	extern struct mount __lookup_mnt(struct vfsmount , struct dentry *);
474279dc AV	90	extern struct mount __lookup_mnt_last(struct vfsmount , struct dentry *);
0226f492	91
294d71ff	92	extern int __legitimize_mnt(struct vfsmount *, unsigned);
48a066e7 AV	93	extern bool legitimize_mnt(struct vfsmount *, unsigned);
48a066e7 AV	94
80b5dce8 EB	95	extern void __detach_mounts(struct dentry *dentry);
	96
	97	static inline void detach_mounts(struct dentry *dentry)
	98	{
	99	if (!d_mountpoint(dentry))
	100	return;
	101	__detach_mounts(dentry);
	102	}
	103
0226f492 AV	104	static inline void get_mnt_ns(struct mnt_namespace *ns)
	105	{
	106	atomic_inc(&ns->count);
	107	}
	108
48a066e7	109	extern seqlock_t mount_lock;
719ea2fb AV	110
	111	static inline void lock_mount_hash(void)
	112	{
48a066e7	113	write_seqlock(&mount_lock);
719ea2fb AV	114	}
	115
	116	static inline void unlock_mount_hash(void)
	117	{
48a066e7	118	write_sequnlock(&mount_lock);
719ea2fb AV	119	}
719ea2fb AV	120
0226f492	121	struct proc_mounts {
0226f492 AV	122	struct mnt_namespace *ns;
	123	struct path root;
	124	int (show)(struct seq_file , struct vfsmount *);
c7999c36 AV	125	void *cached_mount;
	126	u64 cached_event;
	127	loff_t cached_index;
0226f492 AV	128	};
	129
	130	extern const struct seq_operations mounts_op;
7af1364f EB	131
	132	extern bool __is_local_mountpoint(struct dentry *dentry);
	133	static inline bool is_local_mountpoint(struct dentry *dentry)
	134	{
	135	if (!d_mountpoint(dentry))
	136	return false;
	137
	138	return __is_local_mountpoint(dentry);
	139	}