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vfs: more mnt_parent cleanups

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a) mount --move is checking that ->mnt_parent is non-NULL before
looking if that parent happens to be shared; ->mnt_parent is never
NULL and it's not even an misspelled !mnt_has_parent()

b) pivot_root open-codes is_path_reachable(), poorly.

c) so does path_is_under(), while we are at it.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-11-23 19:34:49 -05:00
commit afac7cba7e
4 changed files with 29 additions and 55 deletions
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2
fs/pnode.h
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@ -42,4 +42,6 @@ void mnt_set_mountpoint(struct vfsmount *, struct dentry *,
void release_mounts(struct list_head *);
void umount_tree(struct vfsmount *, int, struct list_head *);
struct vfsmount *copy_tree(struct vfsmount *, struct dentry *, int);
bool is_path_reachable(struct vfsmount *, struct dentry *,
const struct path *root);
#endif /* _LINUX_PNODE_H */