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

/*
 *
 * Definitions for mount interface. This describes the in the kernel build 
 * linkedlist with mounted filesystems.
 *
 * Author:  Marco van Wieringen <mvw@planets.elm.net>
 *
 */
#ifndef _LINUX_MOUNT_H
#define _LINUX_MOUNT_H

#include <linux/types.h>
#include <linux/list.h>
#include <linux/nodemask.h>
#include <linux/spinlock.h>
#include <linux/seqlock.h>
#include <linux/atomic.h>

struct super_block;
struct vfsmount;
struct dentry;
struct mnt_namespace;

#define MNT_NOSUID	0x01
#define MNT_NODEV	0x02
#define MNT_NOEXEC	0x04
#define MNT_NOATIME	0x08
#define MNT_NODIRATIME	0x10
#define MNT_RELATIME	0x20
#define MNT_READONLY	0x40	/* does the user want this to be r/o? */

#define MNT_SHRINKABLE	0x100
#define MNT_WRITE_HOLD	0x200

#define MNT_SHARED	0x1000	/* if the vfsmount is a shared mount */
#define MNT_UNBINDABLE	0x2000	/* if the vfsmount is a unbindable mount */
/*
 * MNT_SHARED_MASK is the set of flags that should be cleared when a
 * mount becomes shared.  Currently, this is only the flag that says a
 * mount cannot be bind mounted, since this is how we create a mount
 * that shares events with another mount.  If you add a new MNT_*
 * flag, consider how it interacts with shared mounts.
 */
#define MNT_SHARED_MASK	(MNT_UNBINDABLE)
#define MNT_PROPAGATION_MASK	(MNT_SHARED | MNT_UNBINDABLE)


#define MNT_INTERNAL	0x4000

struct mnt_pcp {
	int mnt_count;
	int mnt_writers;
};

struct vfsmount {
	struct list_head mnt_hash;
	struct vfsmount *mnt_parent;	/* fs we are mounted on */
	struct dentry *mnt_mountpoint;	/* dentry of mountpoint */
	struct dentry *mnt_root;	/* root of the mounted tree */
	struct super_block *mnt_sb;	/* pointer to superblock */
#ifdef CONFIG_SMP
	struct mnt_pcp __percpu *mnt_pcp;
	atomic_t mnt_longterm;		/* how many of the refs are longterm */
#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 */
	int mnt_flags;
	/* 4 bytes hole on 64bits arches without fsnotify */
#ifdef CONFIG_FSNOTIFY
	__u32 mnt_fsnotify_mask;
	struct hlist_head mnt_fsnotify_marks;
#endif
	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 vfsmount *mnt_master;	/* slave is on master->mnt_slave_list */
	struct mnt_namespace *mnt_ns;	/* containing namespace */
	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;
};

struct file; /* forward dec */

extern int mnt_want_write(struct vfsmount *mnt);
extern int mnt_want_write_file(struct file *file);
extern int mnt_clone_write(struct vfsmount *mnt);
extern void mnt_drop_write(struct vfsmount *mnt);
extern void mntput(struct vfsmount *mnt);
extern struct vfsmount *mntget(struct vfsmount *mnt);
extern void mnt_pin(struct vfsmount *mnt);
extern void mnt_unpin(struct vfsmount *mnt);
extern int __mnt_is_readonly(struct vfsmount *mnt);

extern struct vfsmount *do_kern_mount(const char *fstype, int flags,
				      const char *name, void *data);

struct file_system_type;
extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
				      int flags, const char *name,
				      void *data);

extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list);
extern void mark_mounts_for_expiry(struct list_head *mounts);

extern dev_t name_to_dev_t(char *name);

#endif /* _LINUX_MOUNT_H */
Commit	Line	Data
	1	/*
	2	*
	3	* Definitions for mount interface. This describes the in the kernel build
	4	* linkedlist with mounted filesystems.
	5	*
	6	* Author: Marco van Wieringen <mvw@planets.elm.net>
	7	*
	8	*/
	9	#ifndef _LINUX_MOUNT_H
	10	#define _LINUX_MOUNT_H
	11
	12	#include <linux/types.h>
	13	#include <linux/list.h>
	14	#include <linux/nodemask.h>
	15	#include <linux/spinlock.h>
	16	#include <linux/seqlock.h>
	17	#include <linux/atomic.h>
	18
	19	struct super_block;
	20	struct vfsmount;
	21	struct dentry;
	22	struct mnt_namespace;
	23
	24	#define MNT_NOSUID 0x01
	25	#define MNT_NODEV 0x02
	26	#define MNT_NOEXEC 0x04
	27	#define MNT_NOATIME 0x08
	28	#define MNT_NODIRATIME 0x10
	29	#define MNT_RELATIME 0x20
	30	#define MNT_READONLY 0x40 /* does the user want this to be r/o? */
	31
	32	#define MNT_SHRINKABLE 0x100
	33	#define MNT_WRITE_HOLD 0x200
	34
	35	#define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */
	36	#define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */
	37	/*
	38	* MNT_SHARED_MASK is the set of flags that should be cleared when a
	39	* mount becomes shared. Currently, this is only the flag that says a
	40	* mount cannot be bind mounted, since this is how we create a mount
	41	* that shares events with another mount. If you add a new MNT_*
	42	* flag, consider how it interacts with shared mounts.
	43	*/
	44	#define MNT_SHARED_MASK (MNT_UNBINDABLE)
	45	#define MNT_PROPAGATION_MASK (MNT_SHARED \| MNT_UNBINDABLE)
	46
	47
	48	#define MNT_INTERNAL 0x4000
	49
	50	struct mnt_pcp {
	51	int mnt_count;
	52	int mnt_writers;
	53	};
	54
	55	struct vfsmount {
	56	struct list_head mnt_hash;
	57	struct vfsmount mnt_parent; / fs we are mounted on */
	58	struct dentry mnt_mountpoint; / dentry of mountpoint */
	59	struct dentry mnt_root; / root of the mounted tree */
	60	struct super_block mnt_sb; / pointer to superblock */
	61	#ifdef CONFIG_SMP
	62	struct mnt_pcp __percpu *mnt_pcp;
	63	atomic_t mnt_longterm; /* how many of the refs are longterm */
	64	#else
	65	int mnt_count;
	66	int mnt_writers;
	67	#endif
	68	struct list_head mnt_mounts; /* list of children, anchored here */
	69	struct list_head mnt_child; /* and going through their mnt_child */
	70	int mnt_flags;
	71	/* 4 bytes hole on 64bits arches without fsnotify */
	72	#ifdef CONFIG_FSNOTIFY
	73	__u32 mnt_fsnotify_mask;
	74	struct hlist_head mnt_fsnotify_marks;
	75	#endif
	76	const char mnt_devname; / Name of device e.g. /dev/dsk/hda1 */
	77	struct list_head mnt_list;
	78	struct list_head mnt_expire; /* link in fs-specific expiry list */
	79	struct list_head mnt_share; /* circular list of shared mounts */
	80	struct list_head mnt_slave_list;/* list of slave mounts */
	81	struct list_head mnt_slave; /* slave list entry */
	82	struct vfsmount mnt_master; / slave is on master->mnt_slave_list */
	83	struct mnt_namespace mnt_ns; / containing namespace */
	84	int mnt_id; /* mount identifier */
	85	int mnt_group_id; /* peer group identifier */
	86	int mnt_expiry_mark; /* true if marked for expiry */
	87	int mnt_pinned;
	88	int mnt_ghosts;
	89	};
	90
	91	struct file; /* forward dec */
	92
	93	extern int mnt_want_write(struct vfsmount *mnt);
	94	extern int mnt_want_write_file(struct file *file);
	95	extern int mnt_clone_write(struct vfsmount *mnt);
	96	extern void mnt_drop_write(struct vfsmount *mnt);
	97	extern void mntput(struct vfsmount *mnt);
	98	extern struct vfsmount mntget(struct vfsmount mnt);
	99	extern void mnt_pin(struct vfsmount *mnt);
	100	extern void mnt_unpin(struct vfsmount *mnt);
	101	extern int __mnt_is_readonly(struct vfsmount *mnt);
	102
	103	extern struct vfsmount do_kern_mount(const char fstype, int flags,
	104	const char name, void data);
	105
	106	struct file_system_type;
	107	extern struct vfsmount vfs_kern_mount(struct file_system_type type,
	108	int flags, const char *name,
	109	void *data);
	110
	111	extern void mnt_set_expiry(struct vfsmount mnt, struct list_head expiry_list);
	112	extern void mark_mounts_for_expiry(struct list_head *mounts);
	113
	114	extern dev_t name_to_dev_t(char *name);
	115
	116	#endif /* _LINUX_MOUNT_H */