Add mirroring support across multiple drives

1 files changed, 1 insertions, 0 deletions

diff --git a/ctree.h b/ctree.h
index 1e4c84a1..b90a567d 100644
--- a/ctree.h
+++ b/ctree.h
@@ -406,6 +406,7 @@ struct btrfs_csum_item {
 #define BTRFS_BLOCK_GROUP_SYSTEM   (1 << 1)
 #define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
 #define BTRFS_BLOCK_GROUP_RAID0    (1 << 3)
+#define BTRFS_BLOCK_GROUP_RAID1    (1 << 4)
 
 struct btrfs_block_group_item {
 	__le64 used;