[PATCH] EXT3: ext3 block bitmap leakage

[Kirill Korotaev <dev@openvz.org>]

Andrew, Chris,

this bug is not relevant for 2.6.17 and later.
However, it is relevant for all 2.4.x and <2.6.17 kernels,
so I think this can be of interest to some people and worth commiting to 
2.6.16.x



This patch fixes ext3 block bitmap leakage,
which leads to the following fsck messages on
_healthy_ filesystem:
Block bitmap differences:  -64159 -73707

All kernels up to 2.6.17 have this bug.

Found by
   Vasily Averin <vvs@sw.ru> and Andrey Savochkin <saw@sawoct.com>
Test case triggered the issue was created by
   Dmitry Monakhov <dmonakhov@sw.ru>

Signed-Off-By: Vasiliy Averin <vvs@sw.ru>
Signed-Off-By: Andrey Savochkin <saw@sawoct.com>
Signed-Off-By: Kirill Korotaev <dev@openvz.org>
CC: Dmitry Monakhov <dmonakhov@sw.ru>

--- ./fs/ext3/inode.c.e3crp	2006-06-28 05:22:40.000000000 +0400
+++ ./fs/ext3/inode.c	2006-06-27 13:31:20.000000000 +0400
@@ -585,6 +585,7 @@ static int ext3_alloc_branch(handle_t *h

  	branch[0].key = cpu_to_le32(parent);
  	if (parent) {
+		keys = 1;
  		for (n = 1; n < num; n++) {
  			struct buffer_head *bh;
  			/* Allocate the next block */