Re: GFS2: Fix ref count bug relating to atomic_open

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Hi,

On Fri, 2013-12-06 at 15:54 +0000, Luis Henriques wrote:
> On Thu, Nov 28, 2013 at 10:11:24AM +0000, Steven Whitehouse wrote:
> > 
> > For 3.12 stable. Upstream ref:
> > 
> > http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/fs/gfs2/inode.c?id=ea0341e071527d5cec350917b01ab901af09d758
> 
> Hi Steven, this patch seems to be applicable to the 3.11 kernel as
> well.  I'm queuing it for the next release.
> 
> Cheers,
> --
> Luis
> 
Ok, thanks for sorting that out,

Steve.

> 
> > 
> > From ea0341e071527d5cec350917b01ab901af09d758 Mon Sep 17 00:00:00
> > 2001 From: Steven Whitehouse <swhiteho@xxxxxxxxxx> Date: Thu, 21 Nov
> > 2013 18:47:57 +0000 Subject: GFS2: Fix ref count bug relating to
> > atomic_open
> > 
> > In the case that atomic_open calls finish_no_open() with
> > the dentry that was supplied to gfs2_atomic_open() an
> > extra reference count is required. This patch fixes that
> > issue preventing a bug trap triggering at umount time.
> > 
> > Signed-off-by: Steven Whitehouse <swhiteho@xxxxxxxxxx>
> > 
> > diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
> > index 1615df1..7119504 100644
> > --- a/fs/gfs2/inode.c
> > +++ b/fs/gfs2/inode.c
> > @@ -1171,8 +1171,11 @@ static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
> >  	if (d != NULL)
> >  		dentry = d;
> >  	if (dentry->d_inode) {
> > -		if (!(*opened & FILE_OPENED))
> > +		if (!(*opened & FILE_OPENED)) {
> > +			if (d == NULL)
> > +				dget(dentry);
> >  			return finish_no_open(file, dentry);
> > +		}
> >  		dput(d);
> >  		return 0;
> >  	}
> > -- 
> > 1.8.3.1
> > 
> > 
> > 
> > --
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