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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 */
9#ifndef _LINUX_MOUNT_H
10#define _LINUX_MOUNT_H
Linus Torvalds1da177e2005-04-16 15:20:36 -070011
Andrew Mortond53d9f12005-07-12 13:58:07 -070012#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/list.h>
Dave Hansen3d733632008-02-15 14:37:59 -080014#include <linux/nodemask.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/spinlock.h>
Nick Pigginb3e19d92011-01-07 17:50:11 +110016#include <linux/seqlock.h>
Arun Sharma600634972011-07-26 16:09:06 -070017#include <linux/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
David Howells726c3342006-06-23 02:02:58 -070019struct super_block;
20struct vfsmount;
21struct dentry;
Kirill Korotaev6b3286e2006-12-08 02:37:56 -080022struct mnt_namespace;
David Howells726c3342006-06-23 02:02:58 -070023
Ram Pai07b20882005-11-07 17:19:07 -050024#define MNT_NOSUID 0x01
25#define MNT_NODEV 0x02
26#define MNT_NOEXEC 0x04
Christoph Hellwigfc33a7b2006-01-09 20:52:17 -080027#define MNT_NOATIME 0x08
28#define MNT_NODIRATIME 0x10
Valerie Henson47ae32d2006-12-13 00:34:34 -080029#define MNT_RELATIME 0x20
Dave Hansen2e4b7fc2008-02-15 14:38:00 -080030#define MNT_READONLY 0x40 /* does the user want this to be r/o? */
Miklos Szeredibf066c72006-01-08 01:03:19 -080031
Trond Myklebust5528f9112006-06-09 09:34:17 -040032#define MNT_SHRINKABLE 0x100
npiggin@suse.ded3ef3d72009-04-26 20:25:54 +100033#define MNT_WRITE_HOLD 0x200
Trond Myklebust5528f9112006-06-09 09:34:17 -040034
Christoph Hellwigfc33a7b2006-01-09 20:52:17 -080035#define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */
36#define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */
Valerie Aurora495d6c92010-01-26 14:20:47 -050037/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Al Viro80893522010-02-05 09:30:46 -050048#define MNT_INTERNAL 0x4000
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Eric W. Biederman90563b12013-03-22 03:10:15 -070050#define MNT_LOCK_READONLY 0x400000
51
Ram Pai07b20882005-11-07 17:19:07 -050052struct vfsmount {
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 struct dentry *mnt_root; /* root of the mounted tree */
54 struct super_block *mnt_sb; /* pointer to superblock */
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 int mnt_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -070056};
57
npiggin@suse.de96029c42009-04-26 20:25:55 +100058struct file; /* forward dec */
59
Dave Hansen83660252008-02-15 14:37:30 -080060extern int mnt_want_write(struct vfsmount *mnt);
npiggin@suse.de96029c42009-04-26 20:25:55 +100061extern int mnt_want_write_file(struct file *file);
62extern int mnt_clone_write(struct vfsmount *mnt);
Dave Hansen83660252008-02-15 14:37:30 -080063extern void mnt_drop_write(struct vfsmount *mnt);
Al Viro2a79f172011-12-09 08:06:57 -050064extern void mnt_drop_write_file(struct file *file);
Nick Pigginb3e19d92011-01-07 17:50:11 +110065extern void mntput(struct vfsmount *mnt);
66extern struct vfsmount *mntget(struct vfsmount *mnt);
Al Viro7b7b1ac2005-11-07 17:13:39 -050067extern void mnt_pin(struct vfsmount *mnt);
68extern void mnt_unpin(struct vfsmount *mnt);
Dave Hansen83660252008-02-15 14:37:30 -080069extern int __mnt_is_readonly(struct vfsmount *mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
Trond Myklebustbb4a58b2006-06-09 09:34:15 -040071struct file_system_type;
72extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
73 int flags, const char *name,
74 void *data);
75
David Howellsea5b7782011-01-14 19:10:03 +000076extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077extern void mark_mounts_for_expiry(struct list_head *mounts);
78
Andrew Mortond53d9f12005-07-12 13:58:07 -070079extern dev_t name_to_dev_t(char *name);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Linus Torvalds1da177e2005-04-16 15:20:36 -070081#endif /* _LINUX_MOUNT_H */