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Date:	Wed, 04 Jul 2012 09:44:36 +0800
From:	Tao Ma <tm@....ma>
To:	djwong@...ibm.com
CC:	linux-ext4@...r.kernel.org, Theodore Ts'o <tytso@....edu>
Subject: Re: [PATCH] e2fsprogs/csum: Use fs.csum_seed for xattr block csum
 calculation.

On 07/04/2012 12:58 AM, Darrick J. Wong wrote:
> On Sun, Jun 24, 2012 at 10:22:36PM +0800, Tao Ma wrote:
>> From: Tao Ma <boyu.mt@...bao.com>
>>
>> As I mentioned in the kernel part patch with the subject
>> "ext4: Use s_csum_seed instead of i_csum_seed for xattr block csum",
>> it is not easy for the kernel to use the proper inode csum seed.
>> So always use the fs.csum_seed for the xattr block csum calculation.
>>
>> Cc: Darrick J. Wong <djwong@...ibm.com>
> 
> Acked-by: Darrick J. Wong <djwong@...ibm.com>
> 
> (I assume there's a similar patch for e2fsprogs?)
uh, sorry, but this *is* the patch for e2fsprogs. Something wrong here?

Thanks
Tao
> 
> --D
>> Cc: "Theodore Ts'o" <tytso@....edu>
>> Signed-off-by: Tao Ma <boyu.mt@...bao.com>
>> ---
>>  lib/ext2fs/csum.c |   18 +++---------------
>>  1 files changed, 3 insertions(+), 15 deletions(-)
>>
>> diff --git a/lib/ext2fs/csum.c b/lib/ext2fs/csum.c
>> index a7096d2..5ccbc1c 100644
>> --- a/lib/ext2fs/csum.c
>> +++ b/lib/ext2fs/csum.c
>> @@ -119,21 +119,9 @@ static errcode_t ext2fs_ext_attr_block_csum(ext2_filsys fs, ext2_ino_t inum,
>>  	struct ext2_inode inode;
>>
>>  	hdr->h_checksum = 0;
>> -	if (ext2fs_le32_to_cpu(hdr->h_refcount) != 1) {
>> -		block = ext2fs_cpu_to_le64(block);
>> -		*crc = ext2fs_crc32c_le(fs->csum_seed, (unsigned char *)&block,
>> -					sizeof(block));
>> -	} else {
>> -		retval = ext2fs_read_inode(fs, inum, &inode);
>> -		if (retval)
>> -			return retval;
>> -		inum = ext2fs_cpu_to_le32(inum);
>> -		gen = ext2fs_cpu_to_le32(inode.i_generation);
>> -		*crc = ext2fs_crc32c_le(fs->csum_seed, (unsigned char *)&inum,
>> -					sizeof(inum));
>> -		*crc = ext2fs_crc32c_le(*crc, (unsigned char *)&gen,
>> -					sizeof(gen));
>> -	}
>> +	block = ext2fs_cpu_to_le64(block);
>> +	*crc = ext2fs_crc32c_le(fs->csum_seed, (unsigned char *)&block,
>> +				sizeof(block));
>>  	*crc = ext2fs_crc32c_le(*crc, (unsigned char *)buf, fs->blocksize);
>>  	hdr->h_checksum = old_crc;
>>
>> -- 
>> 1.7.1
>>
>> --
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> 
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