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--- a/fs/jffs2/build.c
+++ b/fs/jffs2/build.c
@@ -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 @@ int jffs2_build_filesystem(struct jffs2_
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. */
--- a/fs/jffs2/scan.c
+++ b/fs/jffs2/scan.c
@@ -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: scan.c,v 1.51.2.4 2003/11/02 13:51:18 dwmw2 Exp $
*
*/
@@ -88,7 +92,12 @@ int jffs2_scan_medium(struct jffs2_sb_in
for (i=0; i<c->nr_blocks; i++) {
struct jffs2_eraseblock *jeb = &c->blocks[i];
- ret = jffs2_scan_eraseblock(c, jeb);
+
+ if (c->flags & (1 << 7))
+ ret = 1;
+ else
+ ret = jffs2_scan_eraseblock(c, jeb);
+
if (ret < 0)
return ret;
@@ -181,6 +190,7 @@ static int jffs2_scan_eraseblock (struct
while(ofs < jeb->offset + c->sector_size) {
ssize_t retlen;
+ unsigned char *buf = (unsigned char *) &node;
ACCT_PARANOIA_CHECK(jeb);
if (ofs & 3) {
@@ -202,8 +212,18 @@ static int jffs2_scan_eraseblock (struct
break;
}
- err = c->mtd->read(c->mtd, ofs, sizeof(node), &retlen, (char *)&node);
+ err = c->mtd->read(c->mtd, ofs, sizeof(node), &retlen, buf);
+ if ((buf[0] == 0xde) &&
+ (buf[1] == 0xad) &&
+ (buf[2] == 0xc0) &&
+ (buf[3] == 0xde)) {
+
+ /* end of filesystem. erase everything after this point */
+ c->flags |= (1 << 7);
+ printk("jffs2_scan_eraseblock(): End of filesystem marker found at 0x%x\n", jeb->offset);
+ return 1;
+ }
if (err) {
D1(printk(KERN_WARNING "mtd->read(0x%x bytes from 0x%x) returned %d\n", sizeof(node), ofs, err));
return err;
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