From owner-freebsd-fs@FreeBSD.ORG  Fri Aug 23 22:26:27 2013
Return-Path: <owner-freebsd-fs@FreeBSD.ORG>
Delivered-To: fs@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTP id 867374BA
 for <fs@freebsd.org>; Fri, 23 Aug 2013 22:26:27 +0000 (UTC)
 (envelope-from mckusick@mckusick.com)
Received: from chez.mckusick.com (chez.mckusick.com
 [IPv6:2001:5a8:4:7e72:4a5b:39ff:fe12:452])
 (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by mx1.freebsd.org (Postfix) with ESMTPS id 6052128AC
 for <fs@freebsd.org>; Fri, 23 Aug 2013 22:26:27 +0000 (UTC)
Received: from chez.mckusick.com (localhost [127.0.0.1])
 by chez.mckusick.com (8.14.3/8.14.3) with ESMTP id r7NMQNnT003092;
 Fri, 23 Aug 2013 15:26:23 -0700 (PDT)
 (envelope-from mckusick@chez.mckusick.com)
Message-Id: <201308232226.r7NMQNnT003092@chez.mckusick.com>
To: Alfred Perlstein <alfred@ixsystems.com>
Subject: Re: expand vfsops for compat 
In-reply-to: <5217DF01.4070504@ixsystems.com> 
Date: Fri, 23 Aug 2013 15:26:23 -0700
From: Kirk McKusick <mckusick@mckusick.com>
Cc: fs@freebsd.org
X-BeenThere: freebsd-fs@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Filesystems <freebsd-fs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-fs>,
 <mailto:freebsd-fs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-fs>
List-Post: <mailto:freebsd-fs@freebsd.org>
List-Help: <mailto:freebsd-fs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
 <mailto:freebsd-fs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 23 Aug 2013 22:26:27 -0000

> Date: Fri, 23 Aug 2013 15:15:29 -0700
> From: Alfred Perlstein <alfred@ixsystems.com>
> To: fs@freebsd.org
> Subject: expand vfsops for compat
> 
> Folks,
> 
> I'd like to grow some spares into the VFSOPS table before 10.x, see 
> attached.
> 
> This will allow us to grow the vfsops during the 10.x cycle without 
> breaking filesystems.
> 
> 
> -- 
> Alfred Perlstein
> 
> 
> --------------040403050509020903050101
> Content-Type: text/plain; charset=UTF-8; x-mac-type="0"; x-mac-creator="0";
>  name="more_vfs_ops.diff"
> Content-Transfer-Encoding: 7bit
> Content-Disposition: attachment;
>  filename="more_vfs_ops.diff"
> 
> Index: sys/mount.h
> ===================================================================
> --- sys/mount.h	(revision 254717)
> +++ sys/mount.h	(working copy)
> @@ -628,6 +628,12 @@
>  	vfs_susp_clean_t	*vfs_susp_clean;
>  	vfs_notify_lowervp_t	*vfs_reclaim_lowervp;
>  	vfs_notify_lowervp_t	*vfs_unlink_lowervp;
> +	vfs_mount_t		*vfs_spare1;
> +	vfs_mount_t		*vfs_spare2;
> +	vfs_mount_t		*vfs_spare3;
> +	vfs_mount_t		*vfs_spare4;
> +	vfs_mount_t		*vfs_spare5;
> +	vfs_mount_t		*vfs_spare6;
>  };
> 
>  vfs_statfs_t	__vfs_statfs;
> 

This seems sensible to me.

	Kirk McKusick