block: Set default request_alignment during bdrv_refresh_limits()
We want to eventually stick request_alignment alongside other BlockLimits, but first, we must ensure it is populated at the same time as all other limits, rather than being a special case that is set only when a block is first opened. Now that all drivers have been updated to supply an override of request_alignment during their .bdrv_refresh_limits(), as needed, the block layer itself can defer setting the default alignment until part of the overall bdrv_refresh_limits(). Signed-off-by: NEric Blake <eblake@redhat.com> Reviewed-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NFam Zheng <famz@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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