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Subject[GFS2] Fix crc32 calculation in recovery.c [8/70]
From
Date
>From 2a2c98247b822db8df037a56c27201f9d716ac66 Mon Sep 17 00:00:00 2001
From: Steven Whitehouse <swhiteho@redhat.com>
Date: Tue, 31 Oct 2006 14:44:50 -0500
Subject: [PATCH] [GFS2] Fix crc32 calculation in recovery.c

Commit "[GFS2] split and annotate gfs2_log_head" resulted in an incorrect
checksum calculation for log headers. This patch corrects the
problem without resorting to copying the whole log header as
the previous code used to.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
---
fs/gfs2/recovery.c | 9 +++++----
1 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/fs/gfs2/recovery.c b/fs/gfs2/recovery.c
index 4478162..4acf238 100644
--- a/fs/gfs2/recovery.c
+++ b/fs/gfs2/recovery.c
@@ -136,6 +136,7 @@ static int get_log_header(struct gfs2_jd
{
struct buffer_head *bh;
struct gfs2_log_header_host lh;
+static const u32 nothing = 0;
u32 hash;
int error;

@@ -143,11 +144,11 @@ static int get_log_header(struct gfs2_jd
if (error)
return error;

- memcpy(&lh, bh->b_data, sizeof(struct gfs2_log_header)); /* XXX */
- lh.lh_hash = 0;
- hash = gfs2_disk_hash((char *)&lh, sizeof(struct gfs2_log_header));
+ hash = crc32_le((u32)~0, bh->b_data, sizeof(struct gfs2_log_header) -
+ sizeof(u32));
+ hash = crc32_le(hash, (unsigned char const *)&nothing, sizeof(nothing));
+ hash ^= (u32)~0;
gfs2_log_header_in(&lh, bh->b_data);
-
brelse(bh);

if (lh.lh_header.mh_magic != GFS2_MAGIC ||
--
1.4.1


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