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From: Andriy Gapon <avg@FreeBSD.org>
Date: Sat, 17 Apr 2010 11:57:41 +0000 (UTC)
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Subject: svn commit: r206756 - stable/8/sys/geom
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Author: avg
Date: Sat Apr 17 11:57:41 2010
New Revision: 206756
URL: http://svn.freebsd.org/changeset/base/206756

Log:
  MFC r206130: g_vfs_open: allow only one mount per device vnode

Modified:
  stable/8/sys/geom/geom_vfs.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)
  stable/8/sys/dev/xen/xenpci/   (props changed)

Modified: stable/8/sys/geom/geom_vfs.c
==============================================================================
--- stable/8/sys/geom/geom_vfs.c	Sat Apr 17 11:40:39 2010	(r206755)
+++ stable/8/sys/geom/geom_vfs.c	Sat Apr 17 11:57:41 2010	(r206756)
@@ -163,6 +163,10 @@ g_vfs_open(struct vnode *vp, struct g_co
 	g_topology_assert();
 
 	*cpp = NULL;
+	bo = &vp->v_bufobj;
+	if (bo->bo_private != vp)
+		return (EBUSY);
+
 	pp = g_dev_getprovider(vp->v_rdev);
 	if (pp == NULL)
 		return (ENOENT);
@@ -178,7 +182,7 @@ g_vfs_open(struct vnode *vp, struct g_co
 	vnode_create_vobject(vp, pp->mediasize, curthread);
 	VFS_UNLOCK_GIANT(vfslocked);
 	*cpp = cp;
-	bo = &vp->v_bufobj;
+	cp->private = vp;
 	bo->bo_ops = g_vfs_bufops;
 	bo->bo_private = cp;
 	bo->bo_bsize = pp->sectorsize;
@@ -198,5 +202,6 @@ g_vfs_close(struct g_consumer *cp)
 	gp = cp->geom;
 	bo = gp->softc;
 	bufobj_invalbuf(bo, V_SAVE, 0, 0);
+	bo->bo_private = cp->private;
 	g_wither_geom_close(gp, ENXIO);
 }