From c53b18820756f6f32ad0782d3bf489422b7c4ad3 Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
Date: Mon, 4 Jan 2021 18:05:07 +0000
Subject: [PATCH] jffs2reset: support fristboot on unmounted UBI overlay

To erase the overlay partitions on systems using UBIFS overlay,
instead of writing the jffs2-marker, truncating the UBI volume to 0
has the desired effect.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
 jffs2reset.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/jffs2reset.c b/jffs2reset.c
index 2236e38..acff913 100644
--- a/jffs2reset.c
+++ b/jffs2reset.c
@@ -19,12 +19,14 @@
 
 #include <fcntl.h>
 #include <dirent.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include <getopt.h>
 
+#include <mtd/ubi-user.h>
 
 #include "libfstools/libfstools.h"
 #include "libfstools/volume.h"
@@ -79,6 +81,13 @@ static int jffs2_mark(struct volume *v)
 		return -1;
 	}
 
+	if (volume_identify(v) == FS_UBIFS) {
+		uint64_t llz = 0;
+		int ret = ioctl(fd, UBI_IOCVOLUP, &llz);
+		close(fd);
+		return ret;
+	}
+
 	sz = write(fd, &deadc0de, sizeof(deadc0de));
 	close(fd);
 
-- 
2.30.2