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SubjectRe: [PATCH 07/13] block: lift setting the readahead size into the block layer
On Thu, Sep 24 2020 at  2:51am -0400,
Christoph Hellwig <> wrote:

> Drivers shouldn't really mess with the readahead size, as that is a VM
> concept. Instead set it based on the optimal I/O size by lifting the
> algorithm from the md driver when registering the disk. Also set
> bdi->io_pages there as well by applying the same scheme based on
> max_sectors. To ensure the limits work well for stacking drivers a
> new helper is added to update the readahead limits from the block
> limits, which is also called from disk_stack_limits.
> Signed-off-by: Christoph Hellwig <>
> Acked-by: Coly Li <>
> Reviewed-by: Johannes Thumshirn <>

Thanks for adding blk_queue_update_readahead()

Reviewed-by: Mike Snitzer <>

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