[thin_repair] we need to read the space maps after all to get the data

volume size.

thin-provisioning/thin_repair.cc

@@ -23,7 +23,12 @@ namespace {
 			emitter::ptr e = create_restore_emitter(new_md);
 
 			block_manager<>::ptr old_bm = open_bm(old_path, block_manager<>::READ_ONLY);
-			metadata::ptr old_md(new metadata(old_bm, false)); // we don't need to read the space maps
+
+			// we need to read the space maps to get the size
+			// of the data device.  This is a shame, since any
+			// corruption in the sms will cause the repair to
+			// fail.
+			metadata::ptr old_md(new metadata(old_bm, true));
 			metadata_dump(old_md, e, true);
 
 		} catch (std::exception &e) {