linux-ext4 - Re: [PATCH] e2fsprogs/csum: Use fs.csum_seed for xattr block csum calculation.

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Date:	Tue, 3 Jul 2012 20:03:21 -0700
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	Tao Ma <tm@....ma>
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 Wed, Jul 04, 2012 at 09:44:36AM +0800, Tao Ma wrote:
> 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?

Oops, I got confused.  Please ignore my baffled comment. :/

--D
> 
> 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
> >>
> >> --
> >> 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
> >>
> > 
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
> > the body of a message to majordomo@...r.kernel.org
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> > 
> 
> 

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