1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * linux/fs/pnode.h
4 *
5 * (C) Copyright IBM Corporation 2005.
6 */
7 #ifndef _LINUX_PNODE_H
8 #define _LINUX_PNODE_H
9
10 #include <linux/list.h>
11 #include "mount.h"
12
13 #define IS_MNT_SHARED(m) ((m)->mnt_t_flags & T_SHARED)
14 #define IS_MNT_SLAVE(m) ((m)->mnt_master)
15 #define IS_MNT_NEW(m) (!(m)->mnt_ns)
16 #define CLEAR_MNT_SHARED(m) ((m)->mnt_t_flags &= ~T_SHARED)
17 #define IS_MNT_UNBINDABLE(m) ((m)->mnt_t_flags & T_UNBINDABLE)
18 #define IS_MNT_MARKED(m) ((m)->mnt_t_flags & T_MARKED)
19 #define SET_MNT_MARK(m) ((m)->mnt_t_flags |= T_MARKED)
20 #define CLEAR_MNT_MARK(m) ((m)->mnt_t_flags &= ~T_MARKED)
21 #define IS_MNT_LOCKED(m) ((m)->mnt.mnt_flags & MNT_LOCKED)
22
23 #define CL_EXPIRE 0x01
24 #define CL_SLAVE 0x02
25 #define CL_COPY_UNBINDABLE 0x04
26 #define CL_MAKE_SHARED 0x08
27 #define CL_PRIVATE 0x10
28 #define CL_COPY_MNT_NS_FILE 0x40
29
30 /*
31 * EXCL[namespace_sem]
32 */
set_mnt_shared(struct mount * mnt)33 static inline void set_mnt_shared(struct mount *mnt)
34 {
35 mnt->mnt_t_flags &= ~T_SHARED_MASK;
36 mnt->mnt_t_flags |= T_SHARED;
37 }
38
peers(const struct mount * m1,const struct mount * m2)39 static inline bool peers(const struct mount *m1, const struct mount *m2)
40 {
41 return m1->mnt_group_id == m2->mnt_group_id && m1->mnt_group_id;
42 }
43
44 void change_mnt_propagation(struct mount *, int);
45 int propagate_mnt(struct mount *, struct mountpoint *, struct mount *,
46 struct hlist_head *);
47 void propagate_umount(struct list_head *);
48 int propagate_mount_busy(struct mount *, int);
49 void propagate_mount_unlock(struct mount *);
50 void mnt_release_group_id(struct mount *);
51 int get_dominating_id(struct mount *mnt, const struct path *root);
52 int mnt_get_count(struct mount *mnt);
53 void mnt_set_mountpoint(struct mount *, struct mountpoint *,
54 struct mount *);
55 void mnt_change_mountpoint(struct mount *parent, struct mountpoint *mp,
56 struct mount *mnt);
57 struct mount *copy_tree(struct mount *, struct dentry *, int);
58 bool is_path_reachable(struct mount *, struct dentry *,
59 const struct path *root);
60 int count_mounts(struct mnt_namespace *ns, struct mount *mnt);
61 bool propagation_would_overmount(const struct mount *from,
62 const struct mount *to,
63 const struct mountpoint *mp);
64 #endif /* _LINUX_PNODE_H */
65