[deliverable/linux.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_USER_SETTABLE_MASK  (MNT_NOSUID | MNT_NODEV | MNT_NOEXEC \
				 | MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME \
				 | MNT_READONLY)
#define MNT_ATIME_MASK (MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME )

#define MNT_INTERNAL_FLAGS (MNT_SHARED | MNT_WRITE_HOLD | MNT_INTERNAL | \
			    MNT_DOOMED | MNT_SYNC_UMOUNT | MNT_MARKED)

#define MNT_INTERNAL	0x4000

#define MNT_LOCK_ATIME		0x040000
#define MNT_LOCK_NOEXEC		0x080000
#define MNT_LOCK_NOSUID		0x100000
#define MNT_LOCK_NODEV		0x200000
#define MNT_LOCK_READONLY	0x400000
#define MNT_LOCKED		0x800000
#define MNT_DOOMED		0x1000000
#define MNT_SYNC_UMOUNT		0x2000000
#define MNT_MARKED		0x4000000

struct vfsmount {
	struct dentry *mnt_root;	/* root of the mounted tree */
	struct super_block *mnt_sb;	/* pointer to superblock */
	int mnt_flags;
};

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 mnt_drop_write_file(struct file *file);
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);

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
1da177e4 LT	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	*
1da177e4 LT	8	*/
	9	#ifndef _LINUX_MOUNT_H
	10	#define _LINUX_MOUNT_H
1da177e4	11
d53d9f16	12	#include <linux/types.h>
1da177e4	13	#include <linux/list.h>
3d733633	14	#include <linux/nodemask.h>
1da177e4	15	#include <linux/spinlock.h>
b3e19d92	16	#include <linux/seqlock.h>
60063497	17	#include <linux/atomic.h>
1da177e4	18
726c3342 DH	19	struct super_block;
	20	struct vfsmount;
	21	struct dentry;
6b3286ed	22	struct mnt_namespace;
726c3342	23
07b20889 RP	24	#define MNT_NOSUID 0x01
	25	#define MNT_NODEV 0x02
	26	#define MNT_NOEXEC 0x04
fc33a7bb CH	27	#define MNT_NOATIME 0x08
fc33a7bb CH	28	#define MNT_NODIRATIME 0x10
47ae32d6	29	#define MNT_RELATIME 0x20
2e4b7fcd	30	#define MNT_READONLY 0x40 /* does the user want this to be r/o? */
bf066c7d	31
5528f911	32	#define MNT_SHRINKABLE 0x100
d3ef3d73	33	#define MNT_WRITE_HOLD 0x200
5528f911	34
fc33a7bb CH	35	#define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */
fc33a7bb CH	36	#define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */
495d6c9c VA	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)
a6138db8 EB	45	#define MNT_USER_SETTABLE_MASK (MNT_NOSUID \| MNT_NODEV \| MNT_NOEXEC \
	46	\| MNT_NOATIME \| MNT_NODIRATIME \| MNT_RELATIME \
	47	\| MNT_READONLY)
9566d674	48	#define MNT_ATIME_MASK (MNT_NOATIME \| MNT_NODIRATIME \| MNT_RELATIME )
495d6c9c	49
f2ebb3a9 AV	50	#define MNT_INTERNAL_FLAGS (MNT_SHARED \| MNT_WRITE_HOLD \| MNT_INTERNAL \| \
f2ebb3a9 AV	51	MNT_DOOMED \| MNT_SYNC_UMOUNT \| MNT_MARKED)
1da177e4	52
8089352a	53	#define MNT_INTERNAL 0x4000
1da177e4	54
9566d674 EB	55	#define MNT_LOCK_ATIME 0x040000
	56	#define MNT_LOCK_NOEXEC 0x080000
	57	#define MNT_LOCK_NOSUID 0x100000
	58	#define MNT_LOCK_NODEV 0x200000
90563b19	59	#define MNT_LOCK_READONLY 0x400000
5ff9d8a6	60	#define MNT_LOCKED 0x800000
48a066e7 AV	61	#define MNT_DOOMED 0x1000000
48a066e7 AV	62	#define MNT_SYNC_UMOUNT 0x2000000
f2ebb3a9	63	#define MNT_MARKED 0x4000000
90563b19	64
07b20889	65	struct vfsmount {
1da177e4 LT	66	struct dentry mnt_root; / root of the mounted tree */
1da177e4 LT	67	struct super_block mnt_sb; / pointer to superblock */
1da177e4	68	int mnt_flags;
1da177e4 LT	69	};
1da177e4 LT	70
96029c4e	71	struct file; /* forward dec */
96029c4e	72
8366025e	73	extern int mnt_want_write(struct vfsmount *mnt);
96029c4e	74	extern int mnt_want_write_file(struct file *file);
96029c4e	75	extern int mnt_clone_write(struct vfsmount *mnt);
8366025e	76	extern void mnt_drop_write(struct vfsmount *mnt);
2a79f17e	77	extern void mnt_drop_write_file(struct file *file);
b3e19d92 NP	78	extern void mntput(struct vfsmount *mnt);
b3e19d92 NP	79	extern struct vfsmount mntget(struct vfsmount mnt);
7b7b1ace AV	80	extern void mnt_pin(struct vfsmount *mnt);
7b7b1ace AV	81	extern void mnt_unpin(struct vfsmount *mnt);
8366025e	82	extern int __mnt_is_readonly(struct vfsmount *mnt);
1da177e4	83
bb4a58bf TM	84	struct file_system_type;
	85	extern struct vfsmount vfs_kern_mount(struct file_system_type type,
	86	int flags, const char *name,
	87	void *data);
	88
ea5b778a	89	extern void mnt_set_expiry(struct vfsmount mnt, struct list_head expiry_list);
1da177e4 LT	90	extern void mark_mounts_for_expiry(struct list_head *mounts);
1da177e4 LT	91
d53d9f16	92	extern dev_t name_to_dev_t(char *name);
1da177e4	93
1da177e4	94	#endif /* _LINUX_MOUNT_H */