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-rw-r--r--include/linux/raid/md_u.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/raid/md_u.h b/include/linux/raid/md_u.h
index 2f824aa889f..fb1abb3367e 100644
--- a/include/linux/raid/md_u.h
+++ b/include/linux/raid/md_u.h
@@ -15,6 +15,24 @@
#ifndef _MD_U_H
#define _MD_U_H
+/*
+ * Different major versions are not compatible.
+ * Different minor versions are only downward compatible.
+ * Different patchlevel versions are downward and upward compatible.
+ */
+#define MD_MAJOR_VERSION 0
+#define MD_MINOR_VERSION 90
+/*
+ * MD_PATCHLEVEL_VERSION indicates kernel functionality.
+ * >=1 means different superblock formats are selectable using SET_ARRAY_INFO
+ * and major_version/minor_version accordingly
+ * >=2 means that Internal bitmaps are supported by setting MD_SB_BITMAP_PRESENT
+ * in the super status byte
+ * >=3 means that bitmap superblock version 4 is supported, which uses
+ * little-ending representation rather than host-endian
+ */
+#define MD_PATCHLEVEL_VERSION 3
+
/* ioctls */
/* status */