linux-kernel - Re: [Cluster-devel] Re: [GFS2] Fix incorrect fs sync behaviour [2/5]

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Date:	Mon, 04 Dec 2006 09:12:12 +0000
From:	Steven Whitehouse <steve@...gwyn.com>
To:	Russell Cattelan <cattelan@...hat.com>
Cc:	cluster-devel@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [Cluster-devel] Re: [GFS2] Fix incorrect fs sync behaviour
	[2/5]

Hi,

On Fri, 2006-12-01 at 11:57 -0600, Russell Cattelan wrote:
> On Mon, 2006-11-06 at 11:07 +0000, Steven Whitehouse wrote:
> > >From 4a221953ed121692aa25998451a57c7f4be8b4f6 Mon Sep 17 00:00:00 2001
> > From: Steven Whitehouse <swhiteho@...hat.com>
> > Date: Wed, 1 Nov 2006 09:57:57 -0500
> > Subject: [PATCH] [GFS2] Fix incorrect fs sync behaviour.
> > 
> > This adds a sync_fs superblock operation for GFS2 and removes
> > the journal flush from write_super in favour of sync_fs where it
> > ought to be. This is more or less identical to the way in which ext3
> > does this.
> > 
> > This bug was pointed out by Russell Cattelan <cattelan@...hat.com>
> > 
> > Cc: Russell Cattelan <cattelan@...hat.com>
> > Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>
> > ---
> >  fs/gfs2/ops_super.c |   44 ++++++++++++++++++++++++++++----------------
> >  1 files changed, 28 insertions(+), 16 deletions(-)
> > 
> > diff --git a/fs/gfs2/ops_super.c b/fs/gfs2/ops_super.c
> > index 06f06f7..b47d959 100644
> > --- a/fs/gfs2/ops_super.c
> > +++ b/fs/gfs2/ops_super.c
> > @@ -138,16 +138,27 @@ static void gfs2_put_super(struct super_
> >  }
> >  
> >  /**
> > - * gfs2_write_super - disk commit all incore transactions
> > - * @sb: the filesystem
> > + * gfs2_write_super
> > + * @sb: the superblock
> >   *
> > - * This function is called every time sync(2) is called.
> > - * After this exits, all dirty buffers are synced.
> >   */
> >  
> >  static void gfs2_write_super(struct super_block *sb)
> >  {
> > +	sb->s_dirt = 0;
> This is a bit different than my original patch?
This was largely taken from the ext3 code as an example, rather than
your patch.

>  
> Are you sure we don't need the s_lock here?
> 
Yes. See linux-2.6/Documentation/filesystems/Locking:


locking rules:
        All may block.
                        BKL     s_lock  s_umount
[snip]
write_super:            no      yes     read

it is already held on entry to write_super,

Steve.


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