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

[Mike Snitzer]

On Fri, Oct 25 2013 at  1:07pm -0400,
Alasdair G Kergon <agk at redhat.com> wrote:

> 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."

Done.