linux-ext4 - Re: Patch to support LUKS UUIDs in libblkid

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Date:	Tue, 12 Jun 2007 19:40:05 -0400
From:	Theodore Tso <tytso@....edu>
To:	Karsten Hopp <karsten@...hat.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: Patch to support LUKS UUIDs in libblkid

On Mon, Jun 11, 2007 at 01:51:24PM +0200, Karsten Hopp wrote:
> +static int probe_luks(struct blkid_probe *probe,
> +		       struct blkid_magic *id __BLKID_ATTR((unused)), 
> +		       unsigned char *buf)
> +{
> +	unsigned char *p_buf = buf;
> +	unsigned char uuid[40];
> +	/* 168 is the offset to the 40 character uuid: 
> +	 * http://luks.endorphin.org/LUKS-on-disk-format.pdf */
> +	p_buf += 168;
> +	strncpy(uuid, p_buf, 40);

Why bother with p_buf?  It would actually be shorter and sweeter to
do:

	strncpy(uuid, buf+168, 40);

And remove the lines dealing with p_buf above.

> +  { "crypt_LUKS",0,	 0,  6,	"LUKS\xba\xbe",		probe_luks },

Any particular reason to use "crypt_LUKS" instead of just "LUKS"?  In
your documentation you generally just refer to it as LUKS.

					- Ted
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