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[dm-devel] Re: [PATCH 1/3] block: Add blk_queue_copy_limits()



On Sat, Sep 19 2009, Jun'ichi Nomura wrote:
> This patch is a preparation for the last patch in this patchset
> which changes blk_set_default_limits() to set 0 to max_sectors.
> 
> dm uses blk_stack_limits() to merge limits of underlying devices
> and copy the end result to the queue.
> But if there's no underlying device (like 'zero' target),
> max_sectors/max_hw_sectors are left unchanged from the default 0
> and just copying it to the queue causes problems.
> 
> Provide blk_queue_copy_limits() to get a safe copy with
> invalid values fixed-up.

Added for 2.6.32.

-- 
Jens Axboe


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