pnode.h

 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 */
33static 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
39static 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
44void change_mnt_propagation(struct mount *, int);
45void bulk_make_private(struct list_head *);
46int propagate_mnt(struct mount *, struct mountpoint *, struct mount *,
47		struct hlist_head *);
48void propagate_umount(struct list_head *);
49int propagate_mount_busy(struct mount *, int);
50void propagate_mount_unlock(struct mount *);
51void mnt_release_group_id(struct mount *);
52int get_dominating_id(struct mount *mnt, const struct path *root);
53int mnt_get_count(struct mount *mnt);
54void mnt_set_mountpoint(struct mount *, struct mountpoint *,
55			struct mount *);
56void mnt_change_mountpoint(struct mount *parent, struct mountpoint *mp,
57			   struct mount *mnt);
58struct mount *copy_tree(struct mount *, struct dentry *, int);
59bool is_path_reachable(struct mount *, struct dentry *,
60			 const struct path *root);
61int count_mounts(struct mnt_namespace *ns, struct mount *mnt);
62bool propagation_would_overmount(const struct mount *from,
63				 const struct mount *to,
64				 const struct mountpoint *mp);
65#endif /* _LINUX_PNODE_H */