[Cluster-devel] [PATCH] gfs2: fix s_writers.counter imbalance in gfs2_ail_empty_gl

[Steven Whitehouse <swhiteho@redhat.com>]

Hi,

looks good. Thanks, I'll add it to the -nmw tree in due course,

Steve.

On Mon, 2012-09-17 at 21:50 -0500, Eric Sandeen wrote:
> gfs2_ail_empty_gl() contains an "inline version" of gfs2_trans_begin(),
> so it needs an explicit sb_start_intwrite() as well, to balance the
> sb_end_intwrite() which will be called by gfs2_trans_end().
> 
> With this, xfstest 068 passes on lock_nolock local gfs2.
> Without it, we reach a writer count of -1 and get stuck.
> 
> Signed-off-by: Eric Sandeen <sandeen@redhat.com>
> ---
> 
> diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
> index 4bdcf37..32cc4fd 100644
> --- a/fs/gfs2/glops.c
> +++ b/fs/gfs2/glops.c
> @@ -94,6 +94,7 @@ static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
>  	/* A shortened, inline version of gfs2_trans_begin() */
>  	tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
>  	tr.tr_ip = (unsigned long)__builtin_return_address(0);
> +	sb_start_intwrite(sdp->sd_vfs);
>  	gfs2_log_reserve(sdp, tr.tr_reserved);
>  	BUG_ON(current->journal_info);
>  	current->journal_info = &tr;
>