1 files changed, 1 insertions, 0 deletions
diff --git a/ioctl.h b/ioctl.h
index b0e5c0db..6a4a2d14 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -126,4 +126,5 @@ struct btrfs_ioctl_ino_lookup_args {
 				   struct btrfs_ioctl_search_args)
 #define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \
 				   struct btrfs_ioctl_ino_lookup_args)
+#define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, u64)
 #endif