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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; +} -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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