b2dba1af3c
vfsmounts have ->mnt_parent pointing either to a different vfsmount or to itself; it's never NULL and termination condition in loops traversing the tree towards root is mnt == mnt->mnt_parent. At least one place (see the next patch) is confused about what's going on; let's add an explicit helper checking it right way and use it in all places where we need it. Not that there had been too many, but... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
/*
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* linux/fs/pnode.h
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*
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* (C) Copyright IBM Corporation 2005.
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* Released under GPL v2.
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*
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*/
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#ifndef _LINUX_PNODE_H
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#define _LINUX_PNODE_H
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#include <linux/list.h>
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#include "mount.h"
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#define IS_MNT_SHARED(mnt) (mnt->mnt_flags & MNT_SHARED)
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#define IS_MNT_SLAVE(mnt) (mnt->mnt_master)
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#define IS_MNT_NEW(mnt) (!mnt->mnt_ns)
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#define CLEAR_MNT_SHARED(mnt) (mnt->mnt_flags &= ~MNT_SHARED)
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#define IS_MNT_UNBINDABLE(mnt) (mnt->mnt_flags & MNT_UNBINDABLE)
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#define CL_EXPIRE 0x01
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#define CL_SLAVE 0x02
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#define CL_COPY_ALL 0x04
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#define CL_MAKE_SHARED 0x08
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#define CL_PRIVATE 0x10
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static inline void set_mnt_shared(struct vfsmount *mnt)
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{
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mnt->mnt_flags &= ~MNT_SHARED_MASK;
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mnt->mnt_flags |= MNT_SHARED;
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}
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void change_mnt_propagation(struct vfsmount *, int);
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int propagate_mnt(struct vfsmount *, struct dentry *, struct vfsmount *,
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struct list_head *);
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int propagate_umount(struct list_head *);
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int propagate_mount_busy(struct vfsmount *, int);
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void mnt_release_group_id(struct vfsmount *);
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int get_dominating_id(struct vfsmount *mnt, const struct path *root);
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unsigned int mnt_get_count(struct vfsmount *mnt);
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void mnt_set_mountpoint(struct vfsmount *, struct dentry *,
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struct vfsmount *);
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void release_mounts(struct list_head *);
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void umount_tree(struct vfsmount *, int, struct list_head *);
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struct vfsmount *copy_tree(struct vfsmount *, struct dentry *, int);
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#endif /* _LINUX_PNODE_H */
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