linux-kernel - Re: [PATCH] Introduce freeze_super and thaw

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Message-ID: <20100323151550.GK30031@ZenIV.linux.org.uk>
Date:	Tue, 23 Mar 2010 15:15:50 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Josef Bacik <josef@...hat.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	chris.mason@...cle.com, hch@....de
Subject: Re: [PATCH] Introduce freeze_super and thaw_super for the fsfreeze
 ioctl

On Tue, Mar 23, 2010 at 03:12:46PM +0000, Al Viro wrote:
> On Tue, Mar 23, 2010 at 03:09:23PM +0000, Al Viro wrote:
> > On Tue, Mar 23, 2010 at 11:03:01AM -0400, Josef Bacik wrote:
> > > > sb is an active reference
> > > > 
> > > 
> > > I don't understand how this is an active reference?  We are talking about
> > > s_active right?
> > 
> > It's an opened file, for crying out loud!  If there is anything that makes
> > sure that superblock will stay alive, that is it...

Grr...  Make that "is alive and can be aliased without any problems, so
atomic_inc(sb->s_active) in caller would do just fine."
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