1 files changed, 13 insertions, 0 deletions
diff --git a/cow.h b/cow.h
new file mode 100644
index 0000000000..5b5f497ed3
--- /dev/null
+++ b/cow.h
@@ -0,0 +1,13 @@
+/* user mode linux compatible COW file */
+#define COW_MAGIC 0x4f4f4f4d  /* MOOO */
+#define COW_VERSION 2
+
+struct cow_header_v2 {
+    uint32_t magic;
+    uint32_t version;
+    char backing_file[1024];
+    int32_t mtime;
+    uint64_t size;
+    uint32_t sectorsize;
+};
+