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-rw-r--r--drivers/block/rbd_types.h25
1 files changed, 20 insertions, 5 deletions
diff --git a/drivers/block/rbd_types.h b/drivers/block/rbd_types.h
index d9d8a77748bc..cbe77fa105ba 100644
--- a/drivers/block/rbd_types.h
+++ b/drivers/block/rbd_types.h
@@ -15,15 +15,30 @@
#include <linux/types.h>
+/* For format version 2, rbd image 'foo' consists of objects
+ * rbd_id.foo - id of image
+ * rbd_header.<id> - image metadata
+ * rbd_data.<id>.0000000000000000
+ * rbd_data.<id>.0000000000000001
+ * ... - data
+ * Clients do not access header data directly in rbd format 2.
+ */
+
+#define RBD_HEADER_PREFIX "rbd_header."
+#define RBD_DATA_PREFIX "rbd_data."
+#define RBD_ID_PREFIX "rbd_id."
+
/*
- * rbd image 'foo' consists of objects
- * foo.rbd - image metadata
- * foo.00000000
- * foo.00000001
- * ... - data
+ * For format version 1, rbd image 'foo' consists of objects
+ * foo.rbd - image metadata
+ * rb.<idhi>.<idlo>.00000000
+ * rb.<idhi>.<idlo>.00000001
+ * ... - data
+ * There is no notion of a persistent image id in rbd format 1.
*/
#define RBD_SUFFIX ".rbd"
+
#define RBD_DIRECTORY "rbd_directory"
#define RBD_INFO "rbd_info"