linux-kernel - Re: [PATCH v3] ocfs2: Let ocfs2_setattr use new truncate sequence.

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Message-ID: <20100610084707.GG30672@mail.oracle.com>
Date:	Thu, 10 Jun 2010 01:47:07 -0700
From:	Joel Becker <Joel.Becker@...cle.com>
To:	Christoph Hellwig <hch@....de>
Cc:	Tao Ma <tao.ma@...cle.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Nick Piggin <npiggin@...e.de>
Subject: Re: [PATCH v3] ocfs2: Let ocfs2_setattr use new truncate sequence.

On Thu, Jun 10, 2010 at 10:27:11AM +0200, Christoph Hellwig wrote:
> You just leave the duplicate inode_newsize_ok in, but still have
> one as part of inode_change_ok.  See the previous thread - we'll
> need to move inode_change_ok to under the cluster locks, both
> for the truncate and non-truncate case.

	Is your concern that the u/gid checks may be against stale ids?

> > +		truncate_setsize(inode, attr->ia_size);
> 
> But any reason this isn't done inside the
> 
>         if (size_change && attr->ia_size != inode->i_size) {
> 
> conditional above?  You'll never get size and uid/gid changes in the
> same request, so there won't be any change in behaviour.

	I think the code exists as-is so that the i_size update only
happens after the quota transfer has been approved.  Jan added the quota
bits in this location.
	I can't see a standard posix op that changes size and ids at the
same time.  I think we just add BUG_ON expressions that ensure such a
behavior, right?

Joel

-- 

 "I'm living so far beyond my income that we may almost be said
 to be living apart."
         - e e cummings

Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker@...cle.com
Phone: (650) 506-8127
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