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ffad9122b6
Make sure that we can handle multiple bmbt records mapping to a single rmapbt record. This can happen if you fallocate more than 2^21 contiguous blocks to a file. (Also add some helpers that can create huge devices with some dm-zero and dm-snapshot fakery.) Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Eryu Guan <eguan@redhat.com>