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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20120911152256.74cb184f@notabene.brown>
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


Download attachment "signature.asc" of type "application/pgp-signature" (829 bytes)