stripe filler parameter

doc/example.conf

@@ -193,6 +193,14 @@ global {
     #   library_dir = "/lib"
 }
 
+activation {
+    # Device used in place of missing stripes if activating incomplete volume.
+    # For now, you need to set this up yourself first (e.g. with 'dmsetup')
+    # For example, you could make it return I/O errors using the 'error' 
+    # target or make it return zeros.
+    missing_stripe_filler = "/dev/ioerror"
+}
+
 
 ####################
 # Advanced section #

lib/config/defaults.h

@@ -57,6 +57,8 @@
 #  define DEFAULT_ACTIVATION 0
 #endif
 
+#define DEFAULT_STRIPE_FILLER "/dev/ioerror"
+
 #ifdef READLINE_SUPPORT
 #  define DEFAULT_MAX_HISTORY 100
 #endif