[dm-devel] [PATCH v3 4/6] block: allow 'chunk_sectors' to be non-power-of-2

[Martin K. Petersen]

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 at oracle.com>

-- 
Martin K. Petersen	Oracle Linux Engineering