xfs: factor dir2 block read operations
In preparation for verifying dir2 block format buffers, factor the read operations out of the block operations (lookup, addname, getdents) and some of the additional logic to make it easier to understand an dmodify the code. Signed-off-by: NDave Chinner <dchinner@redhat.com> Reviewed-by: NBen Myers <bpm@sgi.com> Signed-off-by: NBen Myers <bpm@sgi.com>
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