source: src/linux/universal/linux-4.9/include/linux/mount.h @ 31662

Last change on this file since 31662 was 31662, checked in by brainslayer, 11 days ago

use new squashfs in all kernels

File size: 3.2 KB
Line 
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_USER_SETTABLE_MASK  (MNT_NOSUID | MNT_NODEV | MNT_NOEXEC \
46                                 | MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME \
47                                 | MNT_READONLY)
48#define MNT_ATIME_MASK (MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME )
49
50#define MNT_INTERNAL_FLAGS (MNT_SHARED | MNT_WRITE_HOLD | MNT_INTERNAL | \
51                            MNT_DOOMED | MNT_SYNC_UMOUNT | MNT_MARKED)
52
53#define MNT_INTERNAL    0x4000
54
55#define MNT_LOCK_ATIME          0x040000
56#define MNT_LOCK_NOEXEC         0x080000
57#define MNT_LOCK_NOSUID         0x100000
58#define MNT_LOCK_NODEV          0x200000
59#define MNT_LOCK_READONLY       0x400000
60#define MNT_LOCKED              0x800000
61#define MNT_DOOMED              0x1000000
62#define MNT_SYNC_UMOUNT         0x2000000
63#define MNT_MARKED              0x4000000
64#define MNT_UMOUNT              0x8000000
65
66struct vfsmount {
67        struct dentry *mnt_root;        /* root of the mounted tree */
68        struct super_block *mnt_sb;     /* pointer to superblock */
69        int mnt_flags;
70};
71
72struct file; /* forward dec */
73struct path;
74
75extern int mnt_want_write(struct vfsmount *mnt);
76extern int mnt_want_write_file(struct file *file);
77extern int mnt_clone_write(struct vfsmount *mnt);
78extern void mnt_drop_write(struct vfsmount *mnt);
79extern void mnt_drop_write_file(struct file *file);
80extern void mntput(struct vfsmount *mnt);
81extern struct vfsmount *mntget(struct vfsmount *mnt);
82extern struct vfsmount *mnt_clone_internal(struct path *path);
83extern int __mnt_is_readonly(struct vfsmount *mnt);
84extern bool mnt_may_suid(struct vfsmount *mnt);
85
86struct path;
87extern struct vfsmount *clone_private_mount(struct path *path);
88
89struct file_system_type;
90extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
91                                      int flags, const char *name,
92                                      void *data);
93extern struct vfsmount *vfs_submount(const struct dentry *mountpoint,
94                                     struct file_system_type *type,
95                                     const char *name, void *data);
96
97extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list);
98extern void mark_mounts_for_expiry(struct list_head *mounts);
99
100extern dev_t name_to_dev_t(const char *name);
101
102extern unsigned int sysctl_mount_max;
103
104#endif /* _LINUX_MOUNT_H */
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