+diff -ur linux.old/fs/jffs2/build.c linux.dev/fs/jffs2/build.c
+--- linux.old/fs/jffs2/build.c 2003-06-13 16:51:37.000000000 +0200
++++ linux.dev/fs/jffs2/build.c 2006-06-23 22:15:21.000000000 +0200
+@@ -31,6 +31,10 @@
+ * provisions above, a recipient may use your version of this file
+ * under either the RHEPL or the GPL.
+ *
++ * Modification for automatically cleaning the filesystem after
++ * a specially marked block
++ * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
++ *
+ * $Id: build.c,v 1.16.2.3 2003/04/30 09:43:32 dwmw2 Exp $
+ *
+ */
+@@ -38,6 +42,7 @@
+ #include <linux/kernel.h>
+ #include <linux/jffs2.h>
+ #include <linux/slab.h>
++#include <linux/mtd/mtd.h>
+ #include "nodelist.h"
+
+ int jffs2_build_inode_pass1(struct jffs2_sb_info *, struct jffs2_inode_cache *);
+@@ -89,6 +94,18 @@
+ if (ret)
+ return ret;
+
++ if (c->flags & (1 << 7)) {
++ printk("%s(): unlocking the mtd device... ", __func__);
++ if (c->mtd->unlock)
++ c->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);
++ jffs2_mark_erased_blocks(c);
++ printk("done.\n");
++ }
++
+ D1(printk(KERN_DEBUG "Scanned flash completely\n"));
+ /* Now build the data map for each inode, marking obsoleted nodes
+ as such, and also increase nlink of any children. */