Index: head/sys/compat/linux/linux_ioctl.h
===================================================================
--- head/sys/compat/linux/linux_ioctl.h
+++ head/sys/compat/linux/linux_ioctl.h
@@ -707,6 +707,11 @@
 #define LINUX_IOCTL_VIDEO2_MIN	LINUX_VIDIOC_QUERYCAP
 #define LINUX_IOCTL_VIDEO2_MAX	LINUX_VIDIOC_UNSUBSCRIBE_EVENT
 
+#define	LINUX_F2FS_IOC_GET_FEATURES		0xf50c /* 0x8004f50c */
+
+#define	LINUX_IOCTL_F2FS_MIN			0xf500
+#define	LINUX_IOCTL_F2FS_MAX	LINUX_F2FS_IOC_GET_FEATURES
+
 /*
  * Our libusb(8) calls emulated within linux(4).
  */
Index: head/sys/compat/linux/linux_ioctl.c
===================================================================
--- head/sys/compat/linux/linux_ioctl.c
+++ head/sys/compat/linux/linux_ioctl.c
@@ -3631,6 +3631,7 @@
 
 	switch (args->cmd & 0xffff) {
 	case LINUX_BTRFS_IOC_CLONE:
+	case LINUX_F2FS_IOC_GET_FEATURES:
 	case LINUX_FS_IOC_FIEMAP:
 		return (ENOTSUP);