linux-kernel - Re: [PATCH 3.8-stable] GFS2: Fix unlock of fcntl locks during withdrawn state

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Date:	Thu, 11 Apr 2013 08:59:34 +0100
From:	Steven Whitehouse <swhiteho@...hat.com>
To:	Jonghwan Choi <jhbird.choi@...sung.com>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 3.8-stable] GFS2: Fix unlock of fcntl locks during
 withdrawn state

Hi,

On Thu, 2013-04-11 at 11:05 +0900, Jonghwan Choi wrote:
> This patch looks like it should be in the 3.8-stable tree, should we apply
> it?
> 
Yes, that seems reasonable to me,

Steve.

> ------------------
> 
> From: "Steven Whitehouse <swhiteho@...hat.com>"
> 
> commit c2952d202f710d326ac36a8ea6bd216b20615ec8 upstream
> 
> When withdraw occurs, we need to continue to allow unlocks of fcntl
> locks to occur, however these will only be local, since the node has
> withdrawn from the cluster. This prevents triggering a VFS level
> bug trap due to locks remaining when a file is closed.
> 
> Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>
> Signed-off-by: Jonghwan Choi <jhbird.choi@...sung.com>
> ---
>  fs/gfs2/file.c |    5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
> index 991ab2d..7af426b 100644
> --- a/fs/gfs2/file.c
> +++ b/fs/gfs2/file.c
> @@ -924,8 +924,11 @@ static int gfs2_lock(struct file *file, int cmd, struct
> file_lock *fl)
>  		cmd = F_SETLK;
>  		fl->fl_type = F_UNLCK;
>  	}
> -	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
> +	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) {
> +		if (fl->fl_type == F_UNLCK)
> +			posix_lock_file_wait(file, fl);
>  		return -EIO;
> +	}
>  	if (IS_GETLK(cmd))
>  		return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
>  	else if (fl->fl_type == F_UNLCK)


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