linux-ext4 - Re: [PATCH 14/16] ext4: Make inode checksum cover empty space

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Date:	Fri, 2 Sep 2011 11:42:06 -0700
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	Andreas Dilger <adilger.kernel@...ger.ca>
Cc:	Theodore Tso <tytso@....edu>,
	Sunil Mushran <sunil.mushran@...cle.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: Re: [PATCH 14/16] ext4: Make inode checksum cover empty space

On Thu, Sep 01, 2011 at 01:43:53AM -0600, Andreas Dilger wrote:
> On 2011-08-31, at 6:32 PM, Darrick J. Wong wrote:
> > Extend the inode checksum to cover the empty space between the end of the
> > inode's data fields and the end of the space allocated for the inode.  This
> > enables us to cover extended attribute data that might live in the empty space.
> 
> I'm not sure that this should be a separate patch from the first inode
> checksum patch, but probably isn't harmful.

The only reason why it's separate is that this patch enables checksumming of
in-inode EA blocks.  If someone wants me to reduce the patch count I can merge
them, but ... there's plenty of other things to work on.

--D
> 
> > Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
> > ---
> > fs/ext4/inode.c |    4 +---
> > 1 files changed, 1 insertions(+), 3 deletions(-)
> > 
> > 
> > diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> > index 44a7f88..e24ba98 100644
> > --- a/fs/ext4/inode.c
> > +++ b/fs/ext4/inode.c
> > @@ -53,7 +53,6 @@
> > static __le32 ext4_inode_csum(struct inode *inode, struct ext4_inode *raw)
> > {
> > 	struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
> > -	struct ext4_inode_info *ei = EXT4_I(inode);
> > 	int offset = offsetof(struct ext4_inode, i_checksum);
> > 	__le32 inum = cpu_to_le32(inode->i_ino);
> > 	__u32 crc = 0;
> > @@ -70,8 +69,7 @@ static __le32 ext4_inode_csum(struct inode *inode, struct ext4_inode *raw)
> > 	crc = crc32c_le(crc, (__u8 *)raw, offset);
> > 	offset += sizeof(raw->i_checksum); /* skip checksum */
> > 	crc = crc32c_le(crc, (__u8 *)raw + offset,
> > -		    EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize -
> > -		    offset);
> > +		    EXT4_INODE_SIZE(inode->i_sb) - offset);
> > 	return cpu_to_le32(crc);
> > }
> > 
> > 
> 
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