xfs: rename xfs_ilock_map_shared
Make it clear that we're only locking against the extent map on the data fork. Also clean the function up a little bit. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NBen Myers <bpm@sgi.com>
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