• R
    [PATCH] unbindable mounts · 9676f0c6
    Ram Pai 提交于
    An unbindable mount does not forward or receive propagation.  Also
    unbindable mount disallows bind mounts.  The semantics is as follows.
    
    Bind semantics:
      It is invalid to bind mount an unbindable mount.
    
    Move semantics:
      It is invalid to move an unbindable mount under shared mount.
    
    Clone-namespace semantics:
      If a mount is unbindable in the parent namespace, the corresponding
      cloned mount in the child namespace becomes unbindable too.  Note:
      there is subtle difference, unbindable mounts cannot be bind mounted
      but can be cloned during clone-namespace.
    Signed-off-by: NRam Pai <linuxram@us.ibm.com>
    Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
    Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
    9676f0c6
pnode.h 1013 字节
/*
 *  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 <linux/mount.h>

#define IS_MNT_SHARED(mnt) (mnt->mnt_flags & MNT_SHARED)
#define IS_MNT_SLAVE(mnt) (mnt->mnt_master)
#define IS_MNT_NEW(mnt)  (!mnt->mnt_namespace)
#define CLEAR_MNT_SHARED(mnt) (mnt->mnt_flags &= ~MNT_SHARED)
#define IS_MNT_UNBINDABLE(mnt) (mnt->mnt_flags & MNT_UNBINDABLE)

#define CL_EXPIRE    		0x01
#define CL_SLAVE     		0x02
#define CL_COPY_ALL 		0x04
#define CL_MAKE_SHARED 		0x08
#define CL_PROPAGATION 		0x10

static inline void set_mnt_shared(struct vfsmount *mnt)
{
	mnt->mnt_flags &= ~MNT_PNODE_MASK;
	mnt->mnt_flags |= MNT_SHARED;
}

void change_mnt_propagation(struct vfsmount *, int);
int propagate_mnt(struct vfsmount *, struct dentry *, struct vfsmount *,
		struct list_head *);
int propagate_umount(struct list_head *);
int propagate_mount_busy(struct vfsmount *, int);
#endif /* _LINUX_PNODE_H */
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