linux-ext4 - [PATCH 13/28] ext4: Create bitmap checksum helper functions

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Message-ID: <20111008075509.20506.61977.stgit@elm3c44.beaverton.ibm.com>
Date:	Sat, 08 Oct 2011 00:55:09 -0700
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>,
	Martin K Petersen <martin.petersen@...cle.com>,
	Greg Freemyer <greg.freemyer@...il.com>,
	Amir Goldstein <amir73il@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Mingming Cao <cmm@...ibm.com>,
	Joel Becker <jlbec@...lplan.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-ext4@...r.kernel.org, Coly Li <colyli@...il.com>
Subject: [PATCH 13/28] ext4: Create bitmap checksum helper functions

These helper functions will be used to calculate and verify the block and inode
bitmap checksums.

Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
---
 fs/ext4/bitmap.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)


diff --git a/fs/ext4/bitmap.c b/fs/ext4/bitmap.c
index fa3af81..43d9173 100644
--- a/fs/ext4/bitmap.c
+++ b/fs/ext4/bitmap.c
@@ -29,3 +29,15 @@ unsigned int ext4_count_free(struct buffer_head *map, unsigned int numchars)
 
 #endif  /*  EXT4FS_DEBUG  */
 
+static __u32 ext4_bitmap_csum(struct super_block *sb, ext4_group_t group,
+			      struct buffer_head *bh, int sz)
+{
+	__u32 crc;
+	struct ext4_sb_info *sbi = EXT4_SB(sb);
+
+	group = cpu_to_le32(group);
+	crc = ext4_chksum(sbi, sbi->s_uuid_crc, (__u8 *)&group, sizeof(group));
+	crc = ext4_chksum(sbi, crc, (__u8 *)bh->b_data, sz);
+
+	return crc;
+}

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