Re: [dm-devel] [PATCH v2 19/26] bounce: Refactor __blk_queue_bounce to not use bi_io_vec

[Tejun Heo <tj kernel org>]

On Mon, Sep 10, 2012 at 05:22:30PM -0700, Kent Overstreet wrote:
> A bunch of what __blk_queue_bounce() was doing was problematic for the
> immutable bvec work; this cleans that up and the code is quite a bit
> smaller, too.
> 
> The __bio_for_each_segment() in copy_to_high_bio_irq() was changed
> because that one's looping over the original bio, not the bounce bio -
> since the bounce code doesn't own that bio the __ version wasn't
> correct.

Also, I can't understand the above at all.  I can think why it
wouldn't be necessary but why is it wrong because bounce code doesn't
own it?

-- 
tejun