linux-kernel - Re: [patch 3/8] Make d_path() consistent across mount operations

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Message-ID: <20080602055548.GA4296@infradead.org>
Date:	Mon, 2 Jun 2008 01:55:48 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	hch@...radead.org, linux-fsdevel@...r.kernel.org,
	viro@...IV.linux.org.uk, linux-kernel@...r.kernel.org,
	agruen@...e.de, jjohansen@...e.de
Subject: Re: [patch 3/8] Make d_path() consistent across mount operations

On Sun, Jun 01, 2008 at 10:38:35PM +0200, Miklos Szeredi wrote:
> > > The path that __d_path() computes can become slightly inconsistent when it
> > > races with mount operations: it grabs the vfsmount_lock when traversing mount
> > > points but immediately drops it again, only to re-grab it when it reaches the
> > > next mount point.  The result is that the filename computed is not always
> > > consisent, and the file may never have had that name. (This is unlikely, but
> > > still possible.)
> > > 
> > > Fix this by grabbing the vfsmount_lock for the whole duration of
> > > __d_path().
> > 
> > Looks good, and lock holding times shouldn't be a problem either.
> 
> Thanks for the review of this batch.
> 
> Can you please in the future either explicitly ACK or NACK?  Because I
> really wouldn't want any more of this "Looks good, but bla bla bla"
> and then NACKing the patch when I send it off to Andrew.

ACK for patches 1-3.

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