[PATCH] dm: improve error message consistency

Tidy device-mapper error messages to include context information
automatically.

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>
diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index ba98bf5..64b764b 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -12,6 +12,8 @@
 #include "dm-log.h"
 #include "dm-io.h"
 
+#define DM_MSG_PREFIX "mirror log"
+
 static LIST_HEAD(_log_types);
 static DEFINE_SPINLOCK(_lock);