backport jffs2 eof detect changes from 2.6

git-svn-id: svn://svn.openwrt.org/openwrt/branches/buildroot-ng/openwrt@4062 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 45 insertions, 36 deletions

diff --git a/target/linux/generic-2.4/patches/227-jffs2_eofdetect.patch b/target/linux/generic-2.4/patches/227-jffs2_eofdetect.patch
index ad0ac0c23..fe97be5b3 100644
--- a/target/linux/generic-2.4/patches/227-jffs2_eofdetect.patch
+++ b/target/linux/generic-2.4/patches/227-jffs2_eofdetect.patch
@@ -1,6 +1,47 @@
+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. */
 diff -ur linux.old/fs/jffs2/scan.c linux.dev/fs/jffs2/scan.c
---- linux.old/fs/jffs2/scan.c	2003-11-28 19:26:21.000000000 +0100
-+++ linux.dev/fs/jffs2/scan.c	2006-06-22 00:29:02.000000000 +0200
+--- linux.old/fs/jffs2/scan.c	2006-06-23 21:57:32.000000000 +0200
++++ linux.dev/fs/jffs2/scan.c	2006-06-23 22:01:35.000000000 +0200
 @@ -31,6 +31,10 @@
   * provisions above, a recipient may use your version of this file
   * under either the RHEPL or the GPL.
@@ -26,38 +67,7 @@ diff -ur linux.old/fs/jffs2/scan.c linux.dev/fs/jffs2/scan.c
  		if (ret < 0)
  			return ret;
  
-@@ -145,15 +154,23 @@
- 			c->nr_erasing_blocks++;
- 		}
- 	}
--	/* Rotate the lists by some number to ensure wear levelling */
--	jffs2_rotate_lists(c);
- 
--	if (c->nr_erasing_blocks) {
--		if (!c->used_size && empty_blocks != c->nr_blocks) {
--			printk(KERN_NOTICE "Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes\n");
--			return -EIO;
-+	if (c->flags & (1 << 7)) {
-+		printk("jffs2_scan_medium(): erasing all blocks after the end marker...\n");
-+		jffs2_erase_pending_blocks(c);
-+		jffs2_mark_erased_blocks(c);
-+		printk("jffs2_scan_medium(): done.\n");
-+	} else {
-+		/* Rotate the lists by some number to ensure wear levelling */
-+		jffs2_rotate_lists(c);
-+
-+		if (c->nr_erasing_blocks) {
-+			if (!c->used_size && empty_blocks != c->nr_blocks) {
-+				printk(KERN_NOTICE "Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes\n");
-+				return -EIO;
-+			}
-+			jffs2_erase_pending_trigger(c);
- 		}
--		jffs2_erase_pending_trigger(c);
- 	}
- 	return 0;
- }
-@@ -181,6 +197,7 @@
+@@ -181,6 +190,7 @@
  
  	while(ofs < jeb->offset + c->sector_size) {
  		ssize_t retlen;
@@ -65,7 +75,7 @@ diff -ur linux.old/fs/jffs2/scan.c linux.dev/fs/jffs2/scan.c
  		ACCT_PARANOIA_CHECK(jeb);
  		
  		if (ofs & 3) {
-@@ -202,8 +219,18 @@
+@@ -202,8 +212,18 @@
  			break;
  		}
  
@@ -85,4 +95,3 @@ diff -ur linux.old/fs/jffs2/scan.c linux.dev/fs/jffs2/scan.c
  		if (err) {
  			D1(printk(KERN_WARNING "mtd->read(0x%x bytes from 0x%x) returned %d\n", sizeof(node), ofs, err));
  			return err;
-