[Cluster-devel] [PATCH] GFS2: mark the journal idle to fix ro mounts

[Bob Peterson <rpeterso@redhat.com>]

----- Original Message -----
> When gfs2 was mounted read-only and then unmounted, it was writing a
> header block to the journal in the syncing gfs2_log_flush() call from
> kill_sb(). This is because the journal was not being marked as idle
> until the first log header was written out, and on a read-only mount
> there never was a log header written out. Since the journal was not
> marked idle, gfs2_log_flush() was writing out a header lock to make
> sure it was empty during the sync.  Not only did this cause IO to a
> read-only filesystem, but the journalling isn't completely initialized
> on read-only mounts, and so gfs2 was writing out the wrong sequence
> number in the log header.
> 
> Now, the journal is marked idle on mount, and gfs2_log_flush() won't
> write out anything until there starts being transactions to flush.
> 
> Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
> ---
>  fs/gfs2/ops_fstype.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
> index 8633ad3..fd984f6 100644
> --- a/fs/gfs2/ops_fstype.c
> +++ b/fs/gfs2/ops_fstype.c
> @@ -757,6 +757,7 @@ static int init_journal(struct gfs2_sbd *sdp, int undo)
>  		}
>  	}
>  
> +	sdp->sd_log_idle = 1;
>  	set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
>  	gfs2_glock_dq_uninit(&ji_gh);
>  	jindex = 0;
> --
> 1.8.3.1

Hi,

Now applied to the for-next branch of the linux-gfs2 tree:
https://git.kernel.org/cgit/linux/kernel/git/gfs2/linux-gfs2.git/commit/fs/gfs2?h=for-next&id=086cc672e1cb600b9c17688a4aa44560db858c03

Regards,

Bob Peterson
Red Hat File Systems