[PATCH v2] xfstests: support post-udev device mapper nodes

[Alex Elder]

On Tue, 2011-05-03 at 04:43 -0400, Christoph Hellwig wrote:
> Because of udevs complaining device mapper now creates /dev/dm-N as the real
> device nodes, and just symlinks the /dev/mapper/ names to it.  This would be
> easy if everything used the /dev/mapper clear names, but most system utilities
> translate them back to the /dev/mapper/ names and thus confuse various test
> cases.  Add support to _is_block_dev to read symlinks, and add documentation
> on how to run xfstests on device mapper volumes.
> 
> Signed-off-by: Christoph Hellwig <hch at lst.de>

Looks good to me.

Reviewed-by: Alex Elder <aelder at sgi.com>