linux-kernel - Re: [PATCH 0/4] add crc64 calculation as kernel library

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Date:   Tue, 17 Jul 2018 07:46:46 +0200
From:   Hannes Reinecke <hare@...e.de>
To:     Coly Li <colyli@...e.de>, linux-kernel@...r.kernel.org
Cc:     linux-bcache@...r.kernel.org, linux-block@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Luis R . Rodriguez" <mcgrof@...e.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Michael Lyle <mlyle@...e.org>,
        Kent Overstreet <kent.overstreet@...il.com>,
        Kate Stewart <kstewart@...uxfoundation.org>
Subject: Re: [PATCH 0/4] add crc64 calculation as kernel library

On 07/16/2018 06:55 PM, Coly Li wrote:
> This patch set adds basic implementation of crc64 calculation as Linux
> kernel library. Since bcache already does crc64 by itself, this patch
> set also modifies bcache code to use the new crc64 library routine.
> 
> bcache uses crc64 as storage checksum, if a change of crc lib routines
> results an inconsistent result, the unmatched checksum may make bcache
> 'think' the on-disk is corrupted, such change should be avoided or
> detected as early as possible. Therefore the last patch in this series
> adds a crc test framework, to check consistency of different calculations.
> 
> Coly Li
> 
> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Luis R. Rodriguez <mcgrof@...e.com>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Michael Lyle <mlyle@...e.org>
> Cc: Kent Overstreet <kent.overstreet@...il.com>
> Cc: Kate Stewart <kstewart@...uxfoundation.org>
> ---
> Andy Shevchenko (1):
>   lib/crc64: add crc64 option to lib/Kconfig
> 
> Coly Li (3):
>   lib: add crc64 calculation routines
>   bcache: use routines from lib/crc64.c for CRC64 calculation
>   lib/test_crc: Add test cases for crc calculation
> 
>  drivers/md/bcache/bcache.h  |   7 +-
>  drivers/md/bcache/btree.c   |   2 +-
>  drivers/md/bcache/request.c |   2 +-
>  drivers/md/bcache/super.c   |   5 +-
>  drivers/md/bcache/util.c    | 131 ----------------------------------
>  drivers/md/bcache/util.h    |   5 +-
>  include/linux/crc64.h       |  15 ++++
>  lib/.gitignore              |   2 +
>  lib/Kconfig                 |   8 +++
>  lib/Kconfig.debug           |  11 +++
>  lib/Makefile                |  12 ++++
>  lib/crc64.c                 |  71 +++++++++++++++++++
>  lib/gen_crc64table.c        |  76 ++++++++++++++++++++
>  lib/test_crc.c              | 136 ++++++++++++++++++++++++++++++++++++
>  14 files changed, 341 insertions(+), 142 deletions(-)
>  create mode 100644 include/linux/crc64.h
>  create mode 100644 lib/crc64.c
>  create mode 100644 lib/gen_crc64table.c
>  create mode 100644 lib/test_crc.c
> 
Actually, I would merge patch 1 & 2 together (pointless to introduce an
option for which no code exists).
Otherwise for the whole series:

Reviewed-by: Hannes Reinecke <hare@...e.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare@...e.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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