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

From: NeilBrown
Date: Tue Sep 11 2012 - 01:22:59 EST


On Mon, 10 Sep 2012 17:22:11 -0700 Kent Overstreet <koverstreet@xxxxxxxxxx>
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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