[PATCHv2 1/2] block: Merge discard requests as a special case

[Jens Axboe]

On 2/1/18 1:31 PM, Keith Busch wrote:
> Discard requests operate under different constraints than other operations
> and have different rules for merging. This patch will handle such requests
> as a special case, using the same criteria and segment accounting used
> for merging a discard bio into a reqseut.

I already fixed this one up.

-- 
Jens Axboe