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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 *
4 * Definitions for mount interface. This describes the in the kernel build
5 * linkedlist with mounted filesystems.
6 *
7 * Author: Marco van Wieringen <mvw@planets.elm.net>
8 *
9 */
10#ifndef _LINUX_MOUNT_H
11#define _LINUX_MOUNT_H
12
13#include <linux/types.h>
14#include <asm/barrier.h>
15
16struct super_block;
17struct dentry;
18struct user_namespace;
19struct mnt_idmap;
20struct file_system_type;
21struct fs_context;
22struct file;
23struct path;
24
25enum mount_flags {
26 MNT_NOSUID = 0x01,
27 MNT_NODEV = 0x02,
28 MNT_NOEXEC = 0x04,
29 MNT_NOATIME = 0x08,
30 MNT_NODIRATIME = 0x10,
31 MNT_RELATIME = 0x20,
32 MNT_READONLY = 0x40, /* does the user want this to be r/o? */
33 MNT_NOSYMFOLLOW = 0x80,
34
35 MNT_SHRINKABLE = 0x100,
36
37 MNT_INTERNAL = 0x4000,
38
39 MNT_LOCK_ATIME = 0x040000,
40 MNT_LOCK_NOEXEC = 0x080000,
41 MNT_LOCK_NOSUID = 0x100000,
42 MNT_LOCK_NODEV = 0x200000,
43 MNT_LOCK_READONLY = 0x400000,
44 MNT_LOCKED = 0x800000,
45 MNT_DOOMED = 0x1000000,
46 MNT_SYNC_UMOUNT = 0x2000000,
47 MNT_UMOUNT = 0x8000000,
48
49 MNT_USER_SETTABLE_MASK = MNT_NOSUID | MNT_NODEV | MNT_NOEXEC
50 | MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME
51 | MNT_READONLY | MNT_NOSYMFOLLOW,
52 MNT_ATIME_MASK = MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME,
53
54 MNT_INTERNAL_FLAGS = MNT_INTERNAL | MNT_DOOMED |
55 MNT_SYNC_UMOUNT | MNT_LOCKED
56};
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 struct mnt_idmap *mnt_idmap;
63} __randomize_layout;
64
65static inline struct mnt_idmap *mnt_idmap(const struct vfsmount *mnt)
66{
67 /* Pairs with smp_store_release() in do_idmap_mount(). */
68 return READ_ONCE(mnt->mnt_idmap);
69}
70
71extern int mnt_want_write(struct vfsmount *mnt);
72extern int mnt_want_write_file(struct file *file);
73extern void mnt_drop_write(struct vfsmount *mnt);
74extern void mnt_drop_write_file(struct file *file);
75extern void mntput(struct vfsmount *mnt);
76extern struct vfsmount *mntget(struct vfsmount *mnt);
77extern void mnt_make_shortterm(struct vfsmount *mnt);
78extern struct vfsmount *mnt_clone_internal(const struct path *path);
79extern bool __mnt_is_readonly(const struct vfsmount *mnt);
80extern bool mnt_may_suid(struct vfsmount *mnt);
81
82extern struct vfsmount *clone_private_mount(const struct path *path);
83int mnt_get_write_access(struct vfsmount *mnt);
84void mnt_put_write_access(struct vfsmount *mnt);
85
86extern struct vfsmount *fc_mount(struct fs_context *fc);
87extern struct vfsmount *fc_mount_longterm(struct fs_context *fc);
88extern struct vfsmount *vfs_create_mount(struct fs_context *fc);
89extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
90 int flags, const char *name,
91 void *data);
92
93extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list);
94extern void mark_mounts_for_expiry(struct list_head *mounts);
95
96extern bool path_is_mountpoint(const struct path *path);
97
98extern bool our_mnt(struct vfsmount *mnt);
99
100extern struct vfsmount *kern_mount(struct file_system_type *);
101extern void kern_unmount(struct vfsmount *mnt);
102extern int may_umount_tree(struct vfsmount *);
103extern int may_umount(struct vfsmount *);
104int do_mount(const char *, const char __user *,
105 const char *, unsigned long, void *);
106extern const struct path *collect_paths(const struct path *, struct path *, unsigned);
107extern void drop_collected_paths(const struct path *, const struct path *);
108extern void kern_unmount_array(struct vfsmount *mnt[], unsigned int num);
109
110extern int cifs_root_data(char **dev, char **opts);
111
112#endif /* _LINUX_MOUNT_H */