linux-ext4 - Re: spatch for 64-bit e2fsprogs (was Re: Fix device too big bug in mainline?)

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Date:	Mon, 3 Aug 2009 18:56:24 -0400
From:	Valerie Aurora <vaurora@...hat.com>
To:	Theodore Tso <tytso@....edu>, Julia Lawall <julia@...u.dk>
Cc:	linux-ext4@...r.kernel.org, Eric Sandeen <sandeen@...hat.com>,
	Ric Wheeler <rwheeler@...hat.com>
Subject: Re: spatch for 64-bit e2fsprogs (was Re: Fix device too big bug in mainline?)

On Mon, Aug 03, 2009 at 04:27:40PM -0400, Valerie Aurora wrote:
> On Sat, Aug 01, 2009 at 10:22:09PM -0400, Theodore Tso wrote:
> > 
> > I also would greatly prefer it if people who submit patches to me obey
> > basic patch and code formatting guidelines.  Things like this are
> > really uncool:
> > 
> > -				fs->group_desc[i].bg_free_blocks_count =
> > -					free_array[i];
> > +				ext2fs_bg_free_blocks_count_set(fs, i, free_array[i])
> > +					;
> 
> Ah, that's left over from an spatch bug that Julia Lawall (cc'd)
> kindly fixed immediately after I reported it.  It won't happen if you
> use the current spatch.  My apologies for missing this one during
> review!
> 
> I think spatch could probably also wrap lines automatically when
> making semantic patches - Julia?
> 
> I'm curious what you think of this proposal: Redo all the foo() ->
> foo2() patches in the entire 64-bit series as a semantic patches.
> This would also fix this kind of cut and paste bug:
> 
> +                               ext2fs_bg_flag_clear (fs, i, EXT2_BG_BLOCK_UNINIT);
> +                               ext2fs_bg_flag_clear (fs, i, EXT2_BG_INODE_UNINIT);
> 
> I fixed several of these in the existing 64-bit code when I took it
> over, so I assume more lurk undiscovered and would be revealed if we
> redid them with spatch.
> 
> Julia, would you and/or your students be interested in helping?  I
> think you're running out of bugs in the kernel and e2fsprogs would be
> another excellent showcase for spatch/Coccinelle. :)

I just remembered another reason to convert to spatch: For various
reasons, I ignored several parts of e2fsprogs while doing the 64-bit
conversion.  Some of those should remain unconverted (dead code or
32-bit only code) but others should be converted.  For example, I
found some unconverted block group descriptor references in resize2fs
last week - I remember having some reason for doing it at the time but
I don't recall what it was now since it's been a few months.  Sorry!

-VAL
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