linux-ext4 - [PATCH 34/54] tune2fs: Store checksum algorithm type in superblock

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Date:	Tue, 06 Mar 2012 16:01:15 -0800
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	Andreas Dilger <adilger.kernel@...ger.ca>,
	Theodore Tso <tytso@....edu>,
	"Darrick J. Wong" <djwong@...ibm.com>
Cc:	Sunil Mushran <sunil.mushran@...cle.com>,
	Amir Goldstein <amir73il@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Mingming Cao <cmm@...ibm.com>,
	Joel Becker <jlbec@...lplan.org>, linux-ext4@...r.kernel.org,
	Coly Li <colyli@...il.com>
Subject: [PATCH 34/54] tune2fs: Store checksum algorithm type in superblock

Actually records the checksum algorithm type in the superblock when enabling
checksumming.

Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
---
 misc/tune2fs.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)


diff --git a/misc/tune2fs.c b/misc/tune2fs.c
index 2ae436e..ac5e945 100644
--- a/misc/tune2fs.c
+++ b/misc/tune2fs.c
@@ -701,6 +701,12 @@ static void rewrite_metadata_checksums(ext2_filsys fs)
 	ext2fs_mark_bb_dirty(fs);
 	fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
 	fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
+	if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+		fs->super->s_checksum_type = EXT2_CRC32C_CHKSUM;
+	else
+		fs->super->s_checksum_type = 0;
+	ext2fs_mark_super_dirty(fs);
 }
 
 /*

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