linux-kernel - Re: [GIT PULL] UDF tree fixes

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Message-ID: <20081201170614.GA20279@duck.suse.cz>
Date:	Mon, 1 Dec 2008 18:06:34 +0100
From:	Jan Kara <jack@...e.cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, tibor.tajti@...il.com
Subject: Re: [GIT PULL] UDF tree fixes

On Mon 01-12-08 08:33:36, Linus Torvalds wrote:
> 
> 
> On Mon, 1 Dec 2008, Jan Kara wrote:
> >
> >   Yes, I would like to do it as well. But as I write in the changelog,
> > currently there's no good callback for that (I've mailed about it at
> > linux-fsdevel and noone had a better idea either). So for now I've just
> > used this kludge to silence the Oops.
> 
> No, I meant just a simple "just call clear_inode() from 
> udf_clear_inode()". But on a slightly closer look I notice that won't 
> work, since it will just cause recursion (well, you could just clear the 
> s_op field to avoid it, but that would be uglier than your fix).
> 
> I wonder if we should perhaps just move the invalidate_inode_buffers() 
> call later in clear_inode(). That's a scary change, though. 
> 
> I just think your patch is pretty ugly. I'm sure it works, but I also 
> suspect it indicates some kind of more fundamental problem. I also wonder 
> why udf needs it but nobody else does (others do preallocation too)
  UDF needs this because it does preallocation on directories (and I don't
know about other in-kernel fs which would do this). For regular files,
preallocation is dropped on the last close() but for directories I don't
know about such a good place so we do it in udf_clear_inode().
  There used to be put_inode() callback which could be used for this but
Christoph Hellwig killed it in April.

								Honza
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