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xfs: simplify xfs_map_blocks by using xfs_iext_lookup_extent directly
xfs_bmapi_read adds zero value in xfs_map_blocks. Replace it with a
direct call to the low-level extent lookup function.
Note that we now always pass a 0 length to the trace points as we ask
for an unspecified len.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>