Index: sys/fs/pseudofs/pseudofs.h
===================================================================
--- sys/fs/pseudofs/pseudofs.h	(revision 231011)
+++ sys/fs/pseudofs/pseudofs.h	(working copy)
@@ -303,7 +303,7 @@ static struct vfsops name##_vfsops = {					\
 	.vfs_uninit =		_##name##_uninit,			\
 	.vfs_unmount =		pfs_unmount,				\
 };									\
-VFS_SET(name##_vfsops, name, VFCF_SYNTHETIC);				\
+VFS_SET(name##_vfsops, name, VFCF_SYNTHETIC | VFCF_JAIL);		\
 MODULE_VERSION(name, version);						\
 MODULE_DEPEND(name, pseudofs, 1, 1, 1);
 
Index: sys/fs/nullfs/null_vfsops.c
===================================================================
--- sys/fs/nullfs/null_vfsops.c	(revision 231011)
+++ sys/fs/nullfs/null_vfsops.c	(working copy)
@@ -357,4 +357,4 @@ static struct vfsops null_vfsops = {
 	.vfs_vget =		nullfs_vget,
 };
 
-VFS_SET(null_vfsops, nullfs, VFCF_LOOPBACK);
+VFS_SET(null_vfsops, nullfs, VFCF_LOOPBACK | VFCF_JAIL);
Index: sys/fs/devfs/devfs_vfsops.c
===================================================================
--- sys/fs/devfs/devfs_vfsops.c	(revision 231011)
+++ sys/fs/devfs/devfs_vfsops.c	(working copy)
@@ -186,4 +186,4 @@ static struct vfsops devfs_vfsops = {
 	.vfs_unmount =		devfs_unmount,
 };
 
-VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC);
+VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC | VFCF_JAIL);