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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
19struct super_block;
20struct vfsmount;
21struct dentry;
22struct 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#define MNT_INTERNAL_FLAGS (MNT_SHARED | MNT_WRITE_HOLD | MNT_INTERNAL | \
48 MNT_DOOMED | MNT_SYNC_UMOUNT | MNT_MARKED)
49
50#define MNT_INTERNAL 0x4000
51
52#define MNT_LOCK_READONLY 0x400000
53#define MNT_LOCKED 0x800000
54#define MNT_DOOMED 0x1000000
55#define MNT_SYNC_UMOUNT 0x2000000
56#define MNT_MARKED 0x4000000
57
58struct vfsmount {
59 struct dentry *mnt_root; /* root of the mounted tree */
60 struct super_block *mnt_sb; /* pointer to superblock */
61 int mnt_flags;
62};
63
64struct file; /* forward dec */
65
66extern int mnt_want_write(struct vfsmount *mnt);
67extern int mnt_want_write_file(struct file *file);
68extern int mnt_clone_write(struct vfsmount *mnt);
69extern void mnt_drop_write(struct vfsmount *mnt);
70extern void mnt_drop_write_file(struct file *file);
71extern void mntput(struct vfsmount *mnt);
72extern struct vfsmount *mntget(struct vfsmount *mnt);
73extern void mnt_pin(struct vfsmount *mnt);
74extern void mnt_unpin(struct vfsmount *mnt);
75extern int __mnt_is_readonly(struct vfsmount *mnt);
76
77struct file_system_type;
78extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
79 int flags, const char *name,
80 void *data);
81
82extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list);
83extern void mark_mounts_for_expiry(struct list_head *mounts);
84
85extern dev_t name_to_dev_t(char *name);
86
87#endif /* _LINUX_MOUNT_H */