Add a name field to struct dm_dev so we don't have to use format_dev_t()
all over the place for informative error messages.
Signed-Off-By: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>