mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
f2d0a123bc
rmdir mntpoint will result in an infinite loop when there is a mount locked on the mountpoint in another mount namespace. This is because the logic to test to see if a mount should be disconnected in umount_tree is buggy. Move the logic to decide if a mount should remain connected to it's mountpoint into it's own function disconnect_mount so that clarity of expression instead of terseness of expression becomes a virtue. When the conditions where it is invalid to leave a mount connected are first ruled out, the logic for deciding if a mount should be disconnected becomes much clearer and simpler. Fixes:e0c9c0afd2mnt: Update detach_mounts to leave mounts connected Fixes:ce07d891a0mnt: Honor MNT_LOCKED when detaching mounts Cc: stable@vger.kernel.org Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/*
|
|
* linux/fs/pnode.h
|
|
*
|
|
* (C) Copyright IBM Corporation 2005.
|
|
* Released under GPL v2.
|
|
*
|
|
*/
|
|
#ifndef _LINUX_PNODE_H
|
|
#define _LINUX_PNODE_H
|
|
|
|
#include <linux/list.h>
|
|
#include "mount.h"
|
|
|
|
#define IS_MNT_SHARED(m) ((m)->mnt.mnt_flags & MNT_SHARED)
|
|
#define IS_MNT_SLAVE(m) ((m)->mnt_master)
|
|
#define IS_MNT_NEW(m) (!(m)->mnt_ns)
|
|
#define CLEAR_MNT_SHARED(m) ((m)->mnt.mnt_flags &= ~MNT_SHARED)
|
|
#define IS_MNT_UNBINDABLE(m) ((m)->mnt.mnt_flags & MNT_UNBINDABLE)
|
|
#define IS_MNT_MARKED(m) ((m)->mnt.mnt_flags & MNT_MARKED)
|
|
#define SET_MNT_MARK(m) ((m)->mnt.mnt_flags |= MNT_MARKED)
|
|
#define CLEAR_MNT_MARK(m) ((m)->mnt.mnt_flags &= ~MNT_MARKED)
|
|
#define IS_MNT_LOCKED(m) ((m)->mnt.mnt_flags & MNT_LOCKED)
|
|
|
|
#define CL_EXPIRE 0x01
|
|
#define CL_SLAVE 0x02
|
|
#define CL_COPY_UNBINDABLE 0x04
|
|
#define CL_MAKE_SHARED 0x08
|
|
#define CL_PRIVATE 0x10
|
|
#define CL_SHARED_TO_SLAVE 0x20
|
|
#define CL_UNPRIVILEGED 0x40
|
|
#define CL_COPY_MNT_NS_FILE 0x80
|
|
|
|
#define CL_COPY_ALL (CL_COPY_UNBINDABLE | CL_COPY_MNT_NS_FILE)
|
|
|
|
static inline void set_mnt_shared(struct mount *mnt)
|
|
{
|
|
mnt->mnt.mnt_flags &= ~MNT_SHARED_MASK;
|
|
mnt->mnt.mnt_flags |= MNT_SHARED;
|
|
}
|
|
|
|
void change_mnt_propagation(struct mount *, int);
|
|
int propagate_mnt(struct mount *, struct mountpoint *, struct mount *,
|
|
struct hlist_head *);
|
|
int propagate_umount(struct list_head *);
|
|
int propagate_mount_busy(struct mount *, int);
|
|
void propagate_mount_unlock(struct mount *);
|
|
void mnt_release_group_id(struct mount *);
|
|
int get_dominating_id(struct mount *mnt, const struct path *root);
|
|
unsigned int mnt_get_count(struct mount *mnt);
|
|
void mnt_set_mountpoint(struct mount *, struct mountpoint *,
|
|
struct mount *);
|
|
struct mount *copy_tree(struct mount *, struct dentry *, int);
|
|
bool is_path_reachable(struct mount *, struct dentry *,
|
|
const struct path *root);
|
|
#endif /* _LINUX_PNODE_H */
|