linux-ext4 - Re: [PATCH 1/1] ext4: Remove duplicate inclusion of ext4

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Date:	Tue, 20 Nov 2012 00:22:11 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Sachin Kamat <sachin.kamat@...aro.org>, linux-ext4@...r.kernel.org,
	adilger.kernel@...ger.ca, patches@...aro.org
Subject: Re: [PATCH 1/1] ext4: Remove duplicate inclusion of ext4_extents.h
 in super.c

On Mon, Nov 19, 2012 at 10:00:00AM -0500, Theodore Ts'o wrote:
> On Mon, Nov 19, 2012 at 09:39:45PM +0800, Zheng Liu wrote:
> > Hi Sachin,
> > 
> > Sorry, I don't find this duplicated code in mainline kernel 3.7-rc6.
> 
> It's there because ext4.h includes ext4_extents.h -- at the end of the
> header file, where it's not quite as obvious.

Ah, I see.  Thanks for pointing out.

> 
> What we should probably do is move the function declarations into
> ext4.h, and then see if we can isolate the number of fs/ext4/*.c files
> that are aware of the on-disk extents encoding, such that it doesn't
> make sense to #include ext4_extenst.h from the ext4.h header file.
> 
> It's mainly a cleanup thing, but it would probably also help if we
> ever want to support alternate extents encodings (for example to
> support a full 64-bit physical block numbers, or more likely, more
> than 32 bits worth of logical block nunbers --- so we can test large
> file systems natively using ext4, instead of using xfs, which is what
> I currently do).  That's a low priority thing in my book, but if
> someone is interesting in taking on the project, they should let me
> know.

Cool!  Thanks for sharing this information with us.

Regards,
                                                - Zheng
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