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

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Message-ID: <20100323151246.GJ30031@ZenIV.linux.org.uk>
Date:	Tue, 23 Mar 2010 15:12:46 +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 03:09:23PM +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...
> 
> And lose the "locked" argument, please.  The sane solution is to make
> get_active_super() return it unlocked and have your freeze_bdev() simply
> grab s_umount.  Unconditionally.  I'll do the first part in #untested in
> a minute or so (and make it grab s_umount in the current variant of code in
> fs/block_dev.c); then your patch would shift taking s_umount down into
> freeze_super().

Done.  See the tree on hera (or wait a few until it propagates to git.k.o)
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