linux-kernel - Re: [PATCH v2 00/26] Prep work for immutable bio vecs

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Date:	Tue, 11 Sep 2012 15:22:56 +1000
From:	NeilBrown <neilb@...e.de>
To:	Kent Overstreet <koverstreet@...gle.com>
Cc:	linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, axboe@...nel.dk, tj@...nel.org
Subject: Re: [PATCH v2 00/26] Prep work for immutable bio vecs

On Mon, 10 Sep 2012 17:22:11 -0700 Kent Overstreet <koverstreet@...gle.com>
wrote:

> Random assortment of refactoring and trivial cleanups;
> 
> Immutable bio vecs and efficient bio splitting require auditing and
> removing pretty much all bi_idx uses, among other things.
> 
> The reason is that with immutable bio vecs we can't use the bvec array
> directly; if we have a partially completed bvec, that'll be indicated
> with a field in struct bvec_iter (which gets embedded in struct bio) -
> bi_bvec_done.
> 
> bio_for_each_segments() will handle this transparently, so code needs to
> be converted to use it or some other generic accessor.
> 
> Also, bio splitting means that when a driver gets a bio, bi_idx and
> bi_bvec_done may both be nonzero. Again, just need to use generic
> accessors.
> 
> v2: Patch series now has all the prep work to be done before abstracting
> out the bio iterator, I think.

Hi Kent,
 this looks pretty good to me.  I've only really looked closely at the md
 bits, but they all seem to make sense (with the minor issues that I reported
 separately).

 If/when there is another posting I'll try to allocate some time to testing
 them and looking more closely.

thanks!

NeilBrown


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