From: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Date: Sun, 13 Sep 2009 16:20:35 +0000 (+0900)
Subject: nilfs2: add zero-fill for new btree node buffers
X-Git-Tag: v2.6.32-rc6~8^2
X-Git-Url: http://ftp.safe.ca/?p=safe%2Fjmp%2Flinux-2.6;a=commitdiff_plain;h=05b4358ad564d7a6a51b3717afe771d36711e9c4

nilfs2: add zero-fill for new btree node buffers

Adds missing initialization of newly allocated b-tree node buffers.
This avoids garbage data to be mixed in b-tree node blocks.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
---

diff --git a/fs/nilfs2/btnode.c b/fs/nilfs2/btnode.c
index 435864c..84c2538 100644
--- a/fs/nilfs2/btnode.c
+++ b/fs/nilfs2/btnode.c
@@ -87,6 +87,7 @@ int nilfs_btnode_submit_block(struct address_space *btnc, __u64 blocknr,
 			brelse(bh);
 			BUG();
 		}
+		memset(bh->b_data, 0, 1 << inode->i_blkbits);
 		bh->b_bdev = NILFS_I_NILFS(inode)->ns_bdev;
 		bh->b_blocknr = blocknr;
 		set_buffer_mapped(bh);