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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 MNT_WRITE_HOLD = 0x200,
37
38 MNT_INTERNAL = 0x4000,
39
40 MNT_LOCK_ATIME = 0x040000,
41 MNT_LOCK_NOEXEC = 0x080000,
42 MNT_LOCK_NOSUID = 0x100000,
43 MNT_LOCK_NODEV = 0x200000,
44 MNT_LOCK_READONLY = 0x400000,
45 MNT_LOCKED = 0x800000,
46 MNT_DOOMED = 0x1000000,
47 MNT_SYNC_UMOUNT = 0x2000000,
48 MNT_UMOUNT = 0x8000000,
49
50 MNT_USER_SETTABLE_MASK = MNT_NOSUID | MNT_NODEV | MNT_NOEXEC
51 | MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME
52 | MNT_READONLY | MNT_NOSYMFOLLOW,
53 MNT_ATIME_MASK = MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME,
54
55 MNT_INTERNAL_FLAGS = MNT_WRITE_HOLD | MNT_INTERNAL | MNT_DOOMED |
56 MNT_SYNC_UMOUNT | MNT_LOCKED
57};
58
59struct vfsmount {
60 struct dentry *mnt_root; /* root of the mounted tree */
61 struct super_block *mnt_sb; /* pointer to superblock */
62 int mnt_flags;
63 struct mnt_idmap *mnt_idmap;
64} __randomize_layout;
65
66static inline struct mnt_idmap *mnt_idmap(const struct vfsmount *mnt)
67{
68 /* Pairs with smp_store_release() in do_idmap_mount(). */
69 return READ_ONCE(mnt->mnt_idmap);
70}
71
72extern int mnt_want_write(struct vfsmount *mnt);
73extern int mnt_want_write_file(struct file *file);
74extern void mnt_drop_write(struct vfsmount *mnt);
75extern void mnt_drop_write_file(struct file *file);
76extern void mntput(struct vfsmount *mnt);
77extern struct vfsmount *mntget(struct vfsmount *mnt);
78extern void mnt_make_shortterm(struct vfsmount *mnt);
79extern struct vfsmount *mnt_clone_internal(const struct path *path);
80extern bool __mnt_is_readonly(struct vfsmount *mnt);
81extern bool mnt_may_suid(struct vfsmount *mnt);
82
83extern struct vfsmount *clone_private_mount(const struct path *path);
84int mnt_get_write_access(struct vfsmount *mnt);
85void mnt_put_write_access(struct vfsmount *mnt);
86
87extern struct vfsmount *fc_mount(struct fs_context *fc);
88extern struct vfsmount *fc_mount_longterm(struct fs_context *fc);
89extern struct vfsmount *vfs_create_mount(struct fs_context *fc);
90extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
91 int flags, const char *name,
92 void *data);
93
94extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list);
95extern void mark_mounts_for_expiry(struct list_head *mounts);
96
97extern bool path_is_mountpoint(const struct path *path);
98
99extern bool our_mnt(struct vfsmount *mnt);
100
101extern struct vfsmount *kern_mount(struct file_system_type *);
102extern void kern_unmount(struct vfsmount *mnt);
103extern int may_umount_tree(struct vfsmount *);
104extern int may_umount(struct vfsmount *);
105int do_mount(const char *, const char __user *,
106 const char *, unsigned long, void *);
107extern struct path *collect_paths(const struct path *, struct path *, unsigned);
108extern void drop_collected_paths(struct path *, struct path *);
109extern void kern_unmount_array(struct vfsmount *mnt[], unsigned int num);
110
111extern int cifs_root_data(char **dev, char **opts);
112
113#endif /* _LINUX_MOUNT_H */