diff --git a/libc/kernel/uapi/linux/btrfs.h b/libc/kernel/uapi/linux/btrfs.h
index a69e089..684b295 100644
--- a/libc/kernel/uapi/linux/btrfs.h
+++ b/libc/kernel/uapi/linux/btrfs.h
@@ -174,6 +174,7 @@
 #define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA (1ULL << 8)
 #define BTRFS_FEATURE_INCOMPAT_NO_HOLES (1ULL << 9)
 #define BTRFS_FEATURE_INCOMPAT_METADATA_UUID (1ULL << 10)
+#define BTRFS_FEATURE_INCOMPAT_RAID1C34 (1ULL << 11)
 struct btrfs_ioctl_feature_flags {
   __u64 compat_flags;
   __u64 compat_ro_flags;
@@ -452,7 +453,9 @@
   BTRFS_ERROR_DEV_TGT_REPLACE,
   BTRFS_ERROR_DEV_MISSING_NOT_FOUND,
   BTRFS_ERROR_DEV_ONLY_WRITABLE,
-  BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
+  BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS,
+  BTRFS_ERROR_DEV_RAID1C3_MIN_NOT_MET,
+  BTRFS_ERROR_DEV_RAID1C4_MIN_NOT_MET,
 };
 #define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, struct btrfs_ioctl_vol_args)
 #define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, struct btrfs_ioctl_vol_args)