Re: [PATCH 0/9] Prep work for immutable bio vecs

From: Tejun Heo
Date: Sat Sep 08 2012 - 15:41:16 EST

Hello, Kent.

On Fri, Sep 07, 2012 at 03:59:11PM -0700, Kent Overstreet 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.

There are three pending patchsets and I don't know how they're
supposed to come together. Please explain on which tree the patches
are based and how they stack and preferably provide a git branch.


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