[mirror_ubuntu-bionic-kernel.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;
	int event;
};

struct mnt_pcp {
	int mnt_count;
	int mnt_writers;
};

struct mount {
	struct list_head mnt_hash;
	struct mount *mnt_parent;
	struct dentry *mnt_mountpoint;
	struct vfsmount mnt;
#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 */
#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 */
	int mnt_pinned;
	int mnt_ghosts;
};

#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));
}

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

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

struct proc_mounts {
	struct seq_file m;
	struct mnt_namespace *ns;
	struct path root;
	int (*show)(struct seq_file *, struct vfsmount *);
};

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

extern const struct seq_operations mounts_op;
Commit	Line	Data
b2dba1af	1	#include <linux/mount.h>
0226f492 AV	2	#include <linux/seq_file.h>
	3	#include <linux/poll.h>
	4
	5	struct mnt_namespace {
	6	atomic_t count;
98f842e6	7	unsigned int proc_inum;
be08d6d2	8	struct mount * root;
0226f492	9	struct list_head list;
771b1371	10	struct user_namespace *user_ns;
8823c079	11	u64 seq; /* Sequence number to prevent loops */
0226f492 AV	12	wait_queue_head_t poll;
	13	int event;
	14	};
b2dba1af	15
68e8a9fe AV	16	struct mnt_pcp {
	17	int mnt_count;
	18	int mnt_writers;
	19	};
	20
7d6fec45	21	struct mount {
1b8e5564	22	struct list_head mnt_hash;
0714a533	23	struct mount *mnt_parent;
a73324da	24	struct dentry *mnt_mountpoint;
7d6fec45	25	struct vfsmount mnt;
68e8a9fe AV	26	#ifdef CONFIG_SMP
68e8a9fe AV	27	struct mnt_pcp __percpu *mnt_pcp;
68e8a9fe AV	28	#else
	29	int mnt_count;
	30	int mnt_writers;
	31	#endif
6b41d536 AV	32	struct list_head mnt_mounts; /* list of children, anchored here */
6b41d536 AV	33	struct list_head mnt_child; /* and going through their mnt_child */
39f7c4db	34	struct list_head mnt_instance; /* mount instance on sb->s_mounts */
52ba1621	35	const char mnt_devname; / Name of device e.g. /dev/dsk/hda1 */
1a4eeaf2	36	struct list_head mnt_list;
6776db3d AV	37	struct list_head mnt_expire; /* link in fs-specific expiry list */
	38	struct list_head mnt_share; /* circular list of shared mounts */
	39	struct list_head mnt_slave_list;/* list of slave mounts */
	40	struct list_head mnt_slave; /* slave list entry */
32301920	41	struct mount mnt_master; / slave is on master->mnt_slave_list */
143c8c91	42	struct mnt_namespace mnt_ns; / containing namespace */
c63181e6 AV	43	#ifdef CONFIG_FSNOTIFY
	44	struct hlist_head mnt_fsnotify_marks;
	45	__u32 mnt_fsnotify_mask;
	46	#endif
15169fe7 AV	47	int mnt_id; /* mount identifier */
15169fe7 AV	48	int mnt_group_id; /* peer group identifier */
863d684f AV	49	int mnt_expiry_mark; /* true if marked for expiry */
	50	int mnt_pinned;
	51	int mnt_ghosts;
7d6fec45 AV	52	};
7d6fec45 AV	53
f7a99c5b AV	54	#define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */
f7a99c5b AV	55
7d6fec45 AV	56	static inline struct mount real_mount(struct vfsmount mnt)
	57	{
	58	return container_of(mnt, struct mount, mnt);
	59	}
	60
676da58d	61	static inline int mnt_has_parent(struct mount *mnt)
b2dba1af	62	{
0714a533	63	return mnt != mnt->mnt_parent;
b2dba1af	64	}
c7105365	65
f7a99c5b AV	66	static inline int is_mounted(struct vfsmount *mnt)
	67	{
	68	/* neither detached nor internal? */
	69	return !IS_ERR_OR_NULL(real_mount(mnt));
	70	}
	71
c7105365	72	extern struct mount __lookup_mnt(struct vfsmount , struct dentry *, int);
0226f492 AV	73
	74	static inline void get_mnt_ns(struct mnt_namespace *ns)
	75	{
	76	atomic_inc(&ns->count);
	77	}
	78
	79	struct proc_mounts {
6ce6e24e	80	struct seq_file m;
0226f492 AV	81	struct mnt_namespace *ns;
	82	struct path root;
	83	int (show)(struct seq_file , struct vfsmount *);
	84	};
	85
6ce6e24e AV	86	#define proc_mounts(p) (container_of((p), struct proc_mounts, m))
6ce6e24e AV	87
0226f492	88	extern const struct seq_operations mounts_op;