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qcow: Switch qcow_co_readv to byte-based calls
We are gradually moving away from sector-based interfaces, towards byte-based. Make the change for the internals of the qcow driver read function, by iterating over offset/bytes instead of sector_num/nb_sectors, and with a rename of index_in_cluster and repurposing of n to track bytes instead of sectors. A later patch will then switch the qcow driver as a whole over to byte-based operation. Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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