linux-ext4 - Re: [PATCH 02/54] libext2fs: Change ext4 on-disk layout to support metadata checksumming

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Date:	Mon, 12 Mar 2012 15:24:17 -0700
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	"Ted Ts'o" <tytso@....edu>
Cc:	Andreas Dilger <adilger.kernel@...ger.ca>,
	Sunil Mushran <sunil.mushran@...cle.com>,
	Amir Goldstein <amir73il@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Mingming Cao <cmm@...ibm.com>,
	Joel Becker <jlbec@...lplan.org>, linux-ext4@...r.kernel.org,
	Coly Li <colyli@...il.com>
Subject: Re: [PATCH 02/54] libext2fs: Change ext4 on-disk layout to support
	metadata checksumming

On Fri, Mar 09, 2012 at 05:04:35PM -0500, Ted Ts'o wrote:
> On Tue, Mar 06, 2012 at 03:57:34PM -0800, Darrick J. Wong wrote:
> > Define flags and extend ext4 structure definitions to support metadata
> > checksumming.  Ted T'so covered many of these fields in an earlier patch, but
> > there are more required changes to the disk layout.
> > 
> > Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
> 
> > @@ -619,7 +630,7 @@ struct ext2_super_block {
> >  	__u64   s_mmp_block;            /* Block for multi-mount protection */
> >  	__u32   s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
> >  	__u8	s_log_groups_per_flex;	/* FLEX_BG group size */
> > -	__u8    s_reserved_char_pad;
> > +	__u8    s_checksum_type;	/* metadata checksum algorithm */
> >  	__u16	s_reserved_pad;		/* Padding to next 32bits */
> >  	__u64	s_kbytes_written;	/* nr of lifetime kilobytes written */
> >  	__u32	s_snapshot_inum;	/* Inode number of active snapshot */
> 
> Note: when you change the superblock definition, you *must* also
> update the test in lib/ext2fs/tst_super_size.c.
> 
> If you don't then running "make check" from the top-level of the build
> tree will likely bomb out.  And you will also reveal to me that you
> haven't run the full set of regression tests before submitting your
> patch series.  :-)

Ok, thank you for catching (and fixing) this.

--D
> 
> 					- Ted
> --
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