mirror of
git://git.openwrt.org/openwrt/openwrt.git
synced 2025-11-03 14:34:27 -05:00
96 lines
2.8 KiB
Diff
96 lines
2.8 KiB
Diff
--- a/fs/jffs2/build.c
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+++ b/fs/jffs2/build.c
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@@ -31,6 +31,10 @@
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* provisions above, a recipient may use your version of this file
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* under either the RHEPL or the GPL.
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*
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+ * Modification for automatically cleaning the filesystem after
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+ * a specially marked block
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+ * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
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+ *
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* $Id: build.c,v 1.16.2.3 2003/04/30 09:43:32 dwmw2 Exp $
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*
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*/
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@@ -38,6 +42,7 @@
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#include <linux/kernel.h>
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#include <linux/jffs2.h>
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#include <linux/slab.h>
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+#include <linux/mtd/mtd.h>
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#include "nodelist.h"
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int jffs2_build_inode_pass1(struct jffs2_sb_info *, struct jffs2_inode_cache *);
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@@ -89,6 +94,18 @@ int jffs2_build_filesystem(struct jffs2_
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if (ret)
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return ret;
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+ if (c->flags & (1 << 7)) {
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+ printk("%s(): unlocking the mtd device... ", __func__);
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+ if (c->mtd->unlock)
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+ c->mtd->unlock(c->mtd, 0, c->mtd->size);
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+ printk("done.\n");
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+
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+ printk("%s(): erasing all blocks after the end marker... ", __func__);
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+ jffs2_erase_pending_blocks(c);
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+ jffs2_mark_erased_blocks(c);
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+ printk("done.\n");
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+ }
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+
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D1(printk(KERN_DEBUG "Scanned flash completely\n"));
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/* Now build the data map for each inode, marking obsoleted nodes
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as such, and also increase nlink of any children. */
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--- a/fs/jffs2/scan.c
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+++ b/fs/jffs2/scan.c
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@@ -31,6 +31,10 @@
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* provisions above, a recipient may use your version of this file
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* under either the RHEPL or the GPL.
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*
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+ * Modification for automatically cleaning the filesystem after
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+ * a specially marked block
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+ * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
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+ *
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* $Id: scan.c,v 1.51.2.4 2003/11/02 13:51:18 dwmw2 Exp $
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*
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*/
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@@ -88,7 +92,12 @@ int jffs2_scan_medium(struct jffs2_sb_in
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for (i=0; i<c->nr_blocks; i++) {
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struct jffs2_eraseblock *jeb = &c->blocks[i];
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- ret = jffs2_scan_eraseblock(c, jeb);
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+
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+ if (c->flags & (1 << 7))
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+ ret = 1;
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+ else
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+ ret = jffs2_scan_eraseblock(c, jeb);
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+
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if (ret < 0)
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return ret;
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@@ -181,6 +190,7 @@ static int jffs2_scan_eraseblock (struct
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while(ofs < jeb->offset + c->sector_size) {
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ssize_t retlen;
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+ unsigned char *buf = (unsigned char *) &node;
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ACCT_PARANOIA_CHECK(jeb);
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if (ofs & 3) {
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@@ -202,8 +212,18 @@ static int jffs2_scan_eraseblock (struct
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break;
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}
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- err = c->mtd->read(c->mtd, ofs, sizeof(node), &retlen, (char *)&node);
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+ err = c->mtd->read(c->mtd, ofs, sizeof(node), &retlen, buf);
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+ if ((buf[0] == 0xde) &&
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+ (buf[1] == 0xad) &&
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+ (buf[2] == 0xc0) &&
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+ (buf[3] == 0xde)) {
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+
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+ /* end of filesystem. erase everything after this point */
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+ c->flags |= (1 << 7);
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+ printk("jffs2_scan_eraseblock(): End of filesystem marker found at 0x%x\n", jeb->offset);
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+ return 1;
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+ }
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if (err) {
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D1(printk(KERN_WARNING "mtd->read(0x%x bytes from 0x%x) returned %d\n", sizeof(node), ofs, err));
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return err;
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