linux-kernel - Re: [PATCH v2 0/2] dm verity: add support for error correction

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Message-ID: <20151203195401.GA5444@redhat.com>
Date:	Thu, 3 Dec 2015 14:54:01 -0500
From:	Mike Snitzer <snitzer@...hat.com>
To:	Sami Tolvanen <samitolvanen@...gle.com>
Cc:	Mikulas Patocka <mpatocka@...hat.com>,
	Mandeep Baines <msb@...omium.org>,
	Will Drewry <wad@...omium.org>,
	Alasdair Kergon <agk@...hat.com>, dm-devel@...hat.com,
	linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>,
	Mark Salyzyn <salyzyn@...gle.com>
Subject: Re: [PATCH v2 0/2] dm verity: add support for error correction

On Thu, Dec 03 2015 at  9:26am -0500,
Sami Tolvanen <samitolvanen@...gle.com> wrote:

> Changes since v1:
> 
>   - Added CONFIG_DM_VERITY_FEC and split error correction into
>     dm-verity-fec.[ch] to further separate the functionality from the
>     rest of dm-verity. Follows the same pattern as dm-uevent.
> 
>   - Added missing dependencies for REED_SOLOMON to Kconfig.
> 
>   - Renamed dm-verity.c to dm-verity-target.c to allow an optional
>     object to be added. Follows the naming convention of dm-cache and
>     dm-era.
> 
>   - Changed the algorithm to work with one or more small buffers (~4k)
>     instead of a single large one. The more buffers we can allocate,
>     the faster it will work, but we don't have to preallocate a large
>     amount of memory anymore.
> 
>   - Changed memory allocation to use mempools. v2 preallocates all the
>     memory required for each worker thread to guarantee forward
>     progress in case of memory pressure. The code attempts to allocate
>     more buffers (using GFP_NOIO) and uses them if available.
> 
>   - Added graceful handling of IO errors, which are now treated as any
>     other corruption.
> 
>   - Rebased against linux-dm/for-next.

Thanks a lot for these advances, at a high-level it sounds like you've
handled the issues raised as part of v1 review very well.

I'll review closer now.  Goal is to get these changes staged in
linux-next for upstream inclusion during the 4.5 merge window.
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