[Cluster-devel] Re: [PATCH] gfs2: add barrier/nobarrier mount options
Steven Whitehouse
swhiteho at redhat.com
Fri Oct 30 10:00:50 UTC 2009
Hi,
Thanks for the patch. I've pushed it to the -nmw tree now. I've also
added a two-liner of my own to display the nobarrier option
in /proc/mounts,
Steve.
On Fri, 2009-10-30 at 08:03 +0100, Christoph Hellwig wrote:
> Currently gfs2 issues barrier unconditionally. There are various reasons
> to disable them, be that just for testing or for stupid devices flushing
> large battert backed caches. Add a nobarrier option that matches xfs and
> btrfs for this. Also add a symmetric barrier option to turn it back on
> at remount time.
>
> Signed-off-by: Christoph Hellwig <hch at lst.de>
>
> Index: linux-2.6/fs/gfs2/incore.h
> ===================================================================
> --- linux-2.6.orig/fs/gfs2/incore.h 2009-10-30 07:43:42.246023792 +0100
> +++ linux-2.6/fs/gfs2/incore.h 2009-10-30 07:44:11.173255988 +0100
> @@ -429,6 +429,7 @@ struct gfs2_args {
> unsigned int ar_meta:1; /* mount metafs */
> unsigned int ar_discard:1; /* discard requests */
> unsigned int ar_errors:2; /* errors=withdraw | panic */
> + unsigned int ar_nobarrier:1; /* do not send barriers */
> int ar_commit; /* Commit interval */
> };
>
> Index: linux-2.6/fs/gfs2/super.c
> ===================================================================
> --- linux-2.6.orig/fs/gfs2/super.c 2009-10-30 07:44:29.832024397 +0100
> +++ linux-2.6/fs/gfs2/super.c 2009-10-30 07:53:24.117033618 +0100
> @@ -70,6 +70,8 @@ enum {
> Opt_commit,
> Opt_err_withdraw,
> Opt_err_panic,
> + Opt_barrier,
> + Opt_nobarrier,
> Opt_error,
> };
>
> @@ -98,6 +100,8 @@ static const match_table_t tokens = {
> {Opt_meta, "meta"},
> {Opt_discard, "discard"},
> {Opt_nodiscard, "nodiscard"},
> + {Opt_barrier, "barrier"},
> + {Opt_nobarrier, "nobarrier"},
> {Opt_commit, "commit=%d"},
> {Opt_err_withdraw, "errors=withdraw"},
> {Opt_err_panic, "errors=panic"},
> @@ -207,6 +211,12 @@ int gfs2_mount_args(struct gfs2_sbd *sdp
> case Opt_nodiscard:
> args->ar_discard = 0;
> break;
> + case Opt_barrier:
> + args->ar_nobarrier = 0;
> + break;
> + case Opt_nobarrier:
> + args->ar_nobarrier = 1;
> + break;
> case Opt_commit:
> rv = match_int(&tmp[0], &args->ar_commit);
> if (rv || args->ar_commit <= 0) {
> @@ -1097,6 +1107,10 @@ static int gfs2_remount_fs(struct super_
> sb->s_flags |= MS_POSIXACL;
> else
> sb->s_flags &= ~MS_POSIXACL;
> + if (sdp->sd_args.ar_nobarrier)
> + set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
> + else
> + clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
> spin_lock(>->gt_spin);
> gt->gt_log_flush_secs = args.ar_commit;
> spin_unlock(>->gt_spin);
> Index: linux-2.6/fs/gfs2/ops_fstype.c
> ===================================================================
> --- linux-2.6.orig/fs/gfs2/ops_fstype.c 2009-10-30 07:52:11.050003877 +0100
> +++ linux-2.6/fs/gfs2/ops_fstype.c 2009-10-30 07:52:53.053005337 +0100
> @@ -1143,6 +1143,8 @@ static int fill_super(struct super_block
> }
> if (sdp->sd_args.ar_posix_acl)
> sb->s_flags |= MS_POSIXACL;
> + if (sdp->sd_args.ar_nobarrier)
> + set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
>
> sb->s_magic = GFS2_MAGIC;
> sb->s_op = &gfs2_super_ops;
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