From 4fd5ea43bc11602bfabe2c8f5378586d34bd2b0a Mon Sep 17 00:00:00 2001
From: "Darrick J. Wong" <djwong@us.ibm.com>
Date: Sun, 27 May 2012 08:08:22 -0400
Subject: jbd2: checksum journal superblock

Calculate and verify a checksum covering the journal superblock.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---
 include/linux/jbd2.h | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'include')

diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index 71e77dddebf1..a9632bc55d97 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -969,6 +969,9 @@ struct journal_s
 
 	/* Reference to checksum algorithm driver via cryptoapi */
 	struct crypto_shash *j_chksum_driver;
+
+	/* Precomputed journal UUID checksum for seeding other checksums */
+	__u32 j_csum_seed;
 };
 
 /*
-- 
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