Mike, > It is possible, albeit more unlikely, for a block device to have a non > power-of-2 for chunk_sectors (e.g. 10+2 RAID6 with 128K chunk_sectors, > which results in a full-stripe size of 1280K. This causes the RAID6's > io_opt to be advertised as 1280K, and a stacked device _could_ then be > made to use a blocksize, aka chunk_sectors, that matches non > power-of-2 io_opt of underlying RAID6 -- resulting in stacked device's > chunk_sectors being a non power-of-2). > > Update blk_queue_chunk_sectors() and blk_max_size_offset() to > accommodate drivers that need a non power-of-2 chunk_sectors. Reviewed-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx> -- Martin K. Petersen Oracle Linux Engineering
