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Extend do_open_dir(), au_do_open_nondir() and au_do_open() to receive an
additional parameter h_file, which is an opened file object by branch
fs's ->atomic_open(). By this design/commit, aufs doesn't have to
duplicate many codes into a new aufs_atomic_open() (in later commit),
and can simply share them.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>