linux-kernel - Re: [PATCH 2/7] udf: create common function for tag checksumming

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Date:	Mon, 7 Jan 2008 12:29:34 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	marcin.slusarz@...il.com
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ben Fennema <bfennema@...con.csc.calpoly.edu>,
	Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 2/7] udf: create common function for tag checksumming

> --- a/fs/udf/udfdecl.h
> +++ b/fs/udf/udfdecl.h
> @@ -36,6 +36,18 @@
>  
>  #define udf_get_lb_pblock(sb,loc,offset) udf_get_pblock((sb), (loc).logicalBlockNum, (loc).partitionReferenceNum, (offset))
>  
> +/* computes tag checksum */
> +static inline uint8_t udf_tag_checksum(const tag *t)
> +{
> +	uint8_t *data = (uint8_t *)t;
> +	uint8_t checksum = 0;
> +	int i;
> +	for (i = 0; i < sizeof(tag); ++i)
> +		if (i != 4) /* that's the position of checksum */
> +			checksum += data[i];
> +	return checksum;
> +}

This function is large enough that it should be out of line in a .c
file.  Also I'd prefer using the Linux native types ala:

/* computes tag checksum */
static u8 udf_tag_checksum(const tag *t)
{
	u8 *data = (u8 *)t;
	u8 checksum = 0;
	int i;

	for (i = 0; i < sizeof(tag); i++) {
		if (i != 4) /* position of the checksum */
			checksum += data[i];
	}

	return checksum;
}
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