Messages in this thread Patch in this message | | | Subject | [PATCH 07/22] ext4: Create bitmap checksum helper functions | From | "Darrick J. Wong" <> | Date | Mon, 28 Nov 2011 15:27:03 -0800 |
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These helper functions will be used to calculate and verify the block and inode bitmap checksums.
Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> --- fs/ext4/bitmap.c | 13 +++++++++++++ 1 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/fs/ext4/bitmap.c b/fs/ext4/bitmap.c index fa3af81..285d23a 100644 --- a/fs/ext4/bitmap.c +++ b/fs/ext4/bitmap.c @@ -29,3 +29,16 @@ 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 csum; + struct ext4_sb_info *sbi = EXT4_SB(sb); + + group = cpu_to_le32(group); + csum = ext4_chksum(sbi, sbi->s_uuid_csum, (__u8 *)&group, + sizeof(group)); + csum = ext4_chksum(sbi, csum, (__u8 *)bh->b_data, sz); + + return csum; +}
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