linux-kernel - Re: [PATCH 6/7] omfs: add checksumming routines

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Message-Id: <1206580921.24940.8.camel@brick>
Date:	Wed, 26 Mar 2008 18:22:01 -0700
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Bob Copeland <me@...copeland.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 6/7] omfs: add checksumming routines

On Wed, 2008-03-26 at 20:45 -0400, Bob Copeland wrote:
> OMFS checksums the metadata of all filesystem objects.  This change adds
> the necessary functions to do so.
> 
> Signed-off-by: Bob Copeland <me@...copeland.com>
> ---
>  fs/omfs/checksum.c |   48 ++++++++++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 48 insertions(+), 0 deletions(-)
>  create mode 100644 fs/omfs/checksum.c
> 
> diff --git a/fs/omfs/checksum.c b/fs/omfs/checksum.c
> new file mode 100644
> index 0000000..d6f1023
> --- /dev/null
> +++ b/fs/omfs/checksum.c
> @@ -0,0 +1,48 @@
> +#include <linux/fs.h>
> +#include <linux/buffer_head.h>
> +#include "omfs.h"
> +
> +#define POLY 0x1021
> +
> +/*
> + * crc-ccitt with MSB first (i.e., backwards), so we can't use the
> + * kernel table as-is.
> + */

Why not just add a be-bitwise table, similar to the crc32_le and
crc32_be implementation.


Harvey

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