openwrt/target/linux/generic-2.6/patches-2.6.23/204-jffs2_eofdetect.patch

Index: linux-2.6.23-rc6/fs/jffs2/build.c
===================================================================
--- linux-2.6.23-rc6.orig/fs/jffs2/build.c	2007-09-21 16:23:53.000000000 +0800
+++ linux-2.6.23-rc6/fs/jffs2/build.c	2007-09-21 16:24:05.000000000 +0800
@@ -105,6 +105,17 @@
 	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__);
+		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, -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. */
Index: linux-2.6.23-rc6/fs/jffs2/scan.c
===================================================================
--- linux-2.6.23-rc6.orig/fs/jffs2/scan.c	2007-09-21 16:23:52.000000000 +0800
+++ linux-2.6.23-rc6/fs/jffs2/scan.c	2007-09-21 16:24:05.000000000 +0800
@@ -142,9 +142,12 @@
 
 		/* reset summary info for next eraseblock scan */
 		jffs2_sum_reset_collected(s);
-
-		ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset),
-						buf_size, s);
+		
+		if (c->flags & (1 << 7))
+			ret = BLK_STATE_ALLFF;
+		else
+			ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset),
+							buf_size, s);
 
 		if (ret < 0)
 			goto out;
@@ -545,6 +548,17 @@
 			return err;
 	}
 
+	if ((buf[0] == 0xde) &&
+		(buf[1] == 0xad) &&
+		(buf[2] == 0xc0) &&
+		(buf[3] == 0xde)) {
+		/* end of filesystem. erase everything after this point */
+		printk("%s(): End of filesystem marker found at 0x%x\n", __func__, jeb->offset);
+		c->flags |= (1 << 7);
+
+		return BLK_STATE_ALLFF;
+	}
+	
 	/* We temporarily use 'ofs' as a pointer into the buffer/jeb */
 	ofs = 0;