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1 /* SPDX-License-Identifier: GPL-2.0 */
4 * Definitions for mount interface. This describes the in the kernel build
5 * linkedlist with mounted filesystems.
7 * Author: Marco van Wieringen <mvw@planets.elm.net>
10 #ifndef _LINUX_MOUNT_H
11 #define _LINUX_MOUNT_H
13 #include <linux/types.h>
14 #include <linux/list.h>
15 #include <linux/nodemask.h>
16 #include <linux/spinlock.h>
17 #include <linux/seqlock.h>
18 #include <linux/atomic.h>
26 #define MNT_NOSUID 0x01
27 #define MNT_NODEV 0x02
28 #define MNT_NOEXEC 0x04
29 #define MNT_NOATIME 0x08
30 #define MNT_NODIRATIME 0x10
31 #define MNT_RELATIME 0x20
32 #define MNT_READONLY 0x40 /* does the user want this to be r/o? */
33 #define MNT_NOSYMFOLLOW 0x80
35 #define MNT_SHRINKABLE 0x100
36 #define MNT_WRITE_HOLD 0x200
38 #define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */
39 #define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */
41 * MNT_SHARED_MASK is the set of flags that should be cleared when a
42 * mount becomes shared. Currently, this is only the flag that says a
43 * mount cannot be bind mounted, since this is how we create a mount
44 * that shares events with another mount. If you add a new MNT_*
45 * flag, consider how it interacts with shared mounts.
47 #define MNT_SHARED_MASK (MNT_UNBINDABLE)
48 #define MNT_USER_SETTABLE_MASK (MNT_NOSUID | MNT_NODEV | MNT_NOEXEC \
49 | MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME \
50 | MNT_READONLY | MNT_NOSYMFOLLOW)
51 #define MNT_ATIME_MASK (MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME )
53 #define MNT_INTERNAL_FLAGS (MNT_SHARED | MNT_WRITE_HOLD | MNT_INTERNAL | \
54 MNT_DOOMED | MNT_SYNC_UMOUNT | MNT_MARKED | \
57 #define MNT_INTERNAL 0x4000
59 #define MNT_LOCK_ATIME 0x040000
60 #define MNT_LOCK_NOEXEC 0x080000
61 #define MNT_LOCK_NOSUID 0x100000
62 #define MNT_LOCK_NODEV 0x200000
63 #define MNT_LOCK_READONLY 0x400000
64 #define MNT_LOCKED 0x800000
65 #define MNT_DOOMED 0x1000000
66 #define MNT_SYNC_UMOUNT 0x2000000
67 #define MNT_MARKED 0x4000000
68 #define MNT_UMOUNT 0x8000000
69 #define MNT_CURSOR 0x10000000
72 struct dentry
*mnt_root
; /* root of the mounted tree */
73 struct super_block
*mnt_sb
; /* pointer to superblock */
77 struct file
; /* forward dec */
80 extern int mnt_want_write(struct vfsmount
*mnt
);
81 extern int mnt_want_write_file(struct file
*file
);
82 extern int mnt_clone_write(struct vfsmount
*mnt
);
83 extern void mnt_drop_write(struct vfsmount
*mnt
);
84 extern void mnt_drop_write_file(struct file
*file
);
85 extern void mntput(struct vfsmount
*mnt
);
86 extern struct vfsmount
*mntget(struct vfsmount
*mnt
);
87 extern struct vfsmount
*mnt_clone_internal(const struct path
*path
);
88 extern bool __mnt_is_readonly(struct vfsmount
*mnt
);
89 extern bool mnt_may_suid(struct vfsmount
*mnt
);
92 extern struct vfsmount
*clone_private_mount(const struct path
*path
);
93 extern int __mnt_want_write(struct vfsmount
*);
94 extern void __mnt_drop_write(struct vfsmount
*);
96 struct file_system_type
;
97 extern struct vfsmount
*fc_mount(struct fs_context
*fc
);
98 extern struct vfsmount
*vfs_create_mount(struct fs_context
*fc
);
99 extern struct vfsmount
*vfs_kern_mount(struct file_system_type
*type
,
100 int flags
, const char *name
,
102 extern struct vfsmount
*vfs_submount(const struct dentry
*mountpoint
,
103 struct file_system_type
*type
,
104 const char *name
, void *data
);
106 extern void mnt_set_expiry(struct vfsmount
*mnt
, struct list_head
*expiry_list
);
107 extern void mark_mounts_for_expiry(struct list_head
*mounts
);
109 extern dev_t
name_to_dev_t(const char *name
);
111 extern unsigned int sysctl_mount_max
;
113 extern bool path_is_mountpoint(const struct path
*path
);
115 extern void kern_unmount_array(struct vfsmount
*mnt
[], unsigned int num
);
117 #endif /* _LINUX_MOUNT_H */