--- zzzz-none-000/linux-4.4.60/fs/jffs2/build.c	2017-04-08 07:53:53.000000000 +0000
+++ dragonfly-4020-701/linux-4.4.60/fs/jffs2/build.c	2018-11-08 13:36:17.000000000 +0000
@@ -116,6 +116,16 @@
 	dbg_fsbuild("scanned flash completely\n");
 	jffs2_dbg_dump_block_lists_nolock(c);
 
+	if (c->flags & (1 << 7)) {
+		printk("%s(): unlocking the mtd device... ", __func__);
+		mtd_unlock(c->mtd, 0, c->mtd->size);
+		printk("done.\n");
+
+		printk("%s(): erasing all blocks after the end marker... ", __func__);
+		jffs2_erase_pending_blocks(c, -1);
+		printk("done.\n");
+	}
+
 	dbg_fsbuild("pass 1 starting\n");
 	c->flags |= JFFS2_SB_FLAG_BUILDING;
 	/* Now scan the directory tree, increasing nlink according to every dirent found. */