Re: [PATCH 2/5] filetype: add GPT support

[Johannes Stezenbach <js@sig21.net>]

On Thu, Feb 14, 2013 at 11:44:30PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> +#define MBR_OSTYPE_EFI_GPT	0xee
> +
> +static inline int pmbr_part_valid(const uint8_t *buf)
> +{
> +	if (buf[MBR_PART_sys_ind] == MBR_OSTYPE_EFI_GPT &&
> +		get_unaligned_le32(&buf[MBR_PART_start_sect]) == 1UL) {
> +		return 1;
> +	}
> +
> +	return 0;
> +}
> +
> +/**
> + * is_pmbr_valid(): test Protective MBR for validity
> + * @mbr: pointer to a legacy mbr structure
> + *
> + * Description: Returns 1 if PMBR is valid, 0 otherwise.
> + * Validity depends on two things:
> + *  1) MSDOS signature is in the last two bytes of the MBR
> + *  2) One partition of type 0xEE is found
> + */
> +static int is_gpt_valid(const uint8_t *buf)
> +{
> +	int i;
> +
> +	if (get_unaligned_le16(&buf[BS_55AA]) != 0xAA55)
> +		return 0;
> +
> +	if (strncmp(&buf[512], "EFI PART", 8))
> +		return 0;
> +
> +	buf += MBR_Table;
> +
> +	for (i = 0; i < 4; i++, buf += MBR_partition_size) {
> +		if (pmbr_part_valid(buf))
> +			return 1;
> +	}
> +	return 0;
> +}


ACK, this is what I meant.

Thanks,
Johannes

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