linux-ext4 - Re: [PATCH 06/36 v4] libext2fs: add data structures for inline data feature

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Message-ID: <20120813081003.GC21093@gmail.com>
Date:	Mon, 13 Aug 2012 16:10:03 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Theodore Ts'o <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org, Zheng Liu <wenqing.lz@...bao.com>
Subject: Re: [PATCH 06/36 v4] libext2fs: add data structures for inline data
 feature

On Tue, Aug 07, 2012 at 02:50:53PM -0400, Theodore Ts'o wrote:
> On Tue, Jul 31, 2012 at 07:47:59PM +0800, Zheng Liu wrote:
> > +struct ext2_ext_attr_ibody_header {
> > +	__u32	h_magic;
> > +};
> > +
> 
> I've searched through the entire patch series, and I don't find any
> usage of h_magic, and in fact the only place this structure definition
> is used is in ext2fs_get_inline_xattr_pos().
> 
> So that's a bit worrying; if this is a magic number, then it should be
> checked (and an error returned if the magic number is not what we
> expect it tobe).  Add checks into e2fsck would also be a really good
> idea.  Also, what is the value that h_magic is epxected to be?  It
> needs to be defined here.
> 
> It's also clear from looking at this function that this patch
> significantly changes the layout of the extended attribute block of
> data.  It would be a really good idea to add some ascii art to
> document exactly what is going on.  A diagram so it's obvious to
> future developers about the data layout is really needed.

Thanks, I will fix it.

Regards,
Zheng
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