vfs: now it can be done - make mnt_parent point to struct mount

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --cc fs/dcache.c
Simple merge

diff --cc fs/mount.h
Simple merge

diff --cc fs/namei.c
Simple merge

diff --cc fs/namespace.c
Simple merge

diff --cc fs/pnode.c
Simple merge