diff --git a/sys/compat/linux/linux_ioctl.c b/sys/compat/linux/linux_ioctl.c
index 1af201e7ef7..572060e8f05 100644
--- a/sys/compat/linux/linux_ioctl.c
+++ b/sys/compat/linux/linux_ioctl.c
@@ -3596,9 +3596,16 @@ linux_ioctl(struct thread *td, struct linux_ioctl_args *args)
 	sx_sunlock(&linux_ioctl_sx);
 	fdrop(fp, td);
 
-	linux_msg(td, "ioctl fd=%d, cmd=0x%x ('%c',%d) is not implemented",
-	    args->fd, (int)(args->cmd & 0xffff),
-	    (int)(args->cmd & 0xff00) >> 8, (int)(args->cmd & 0xff));
+	switch (args->cmd & 0xffff) {
+	case LINUX_BTRFS_IOC_CLONE:
+		return (ENOTSUP);
+
+	default:
+		linux_msg(td, "ioctl fd=%d, cmd=0x%x ('%c',%d) is not implemented",
+		    args->fd, (int)(args->cmd & 0xffff),
+		    (int)(args->cmd & 0xff00) >> 8, (int)(args->cmd & 0xff));
+		break;
+	}
 
 	return (EINVAL);
 }
diff --git a/sys/compat/linux/linux_ioctl.h b/sys/compat/linux/linux_ioctl.h
index 9419152c6a9..873937deecd 100644
--- a/sys/compat/linux/linux_ioctl.h
+++ b/sys/compat/linux/linux_ioctl.h
@@ -744,6 +744,12 @@
 #define	FBSD_LUSB_MAX			0xffff
 #define	FBSD_LUSB_MIN			0xffdd
 
+/*
+ * Linux btrfs clone operation
+ */
+#define LINUX_BTRFS_IOC_CLONE		0x9409 /* 0x40049409 */
+
+
 /*
  * Pluggable ioctl handlers
  */