[dm-devel] [PATCH 09/24] dm cache metadata: check the metadata version when reading the superblock

[Alasdair G Kergon]

On Thu, Oct 24, 2013 at 02:30:22PM -0400, Mike Snitzer wrote:
> From: Joe Thornber <ejt at redhat.com>

> +++ b/drivers/md/dm-cache-metadata.c
> @@ -20,7 +20,13 @@

> + * defines a range of metadata versions that this module can handle.

> +{
> +	uint32_t metadata_version = le32_to_cpu(disk_super->version);

+

> +	if (metadata_version < MIN_CACHE_VERSION || metadata_version > MAX_CACHE_VERSION) {
> +		DMERR("kernel does not support this version of cache metadata (%u)",
> +		      metadata_version);

- Also state the range supported?
   "Cache metadata version %u found, but only versions between %u and %u supported."

Alasdair