>Number:         35000
>Category:       kern
>Synopsis:       LKM for PUFFS user-space filesystem
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Mon Nov 06 09:55:00 +0000 2006
>Originator:     Lubomir Kundrak
>Release:        NetBSD 4.99.3
>Organization:
>Environment:
>Description:
I thought it would be nice if PUFFS was available as a LKM, especially for testing and playing with it. So below is the patch I use, hopefully it will be also useful to someone else but me.
>How-To-Repeat:

>Fix:
Create directory "sys/lkm/vfs/puffs" before attempting to apply the patch

--- sys/lkm/vfs/puffs/Makefile.orig	1970-01-01 01:00:00.000000000 +0100
+++ sys/lkm/vfs/puffs/Makefile	2006-11-06 01:01:03.000000000 +0100
@@ -0,0 +1,12 @@
+#	$NetBSD$
+
+.include "../Makefile.inc"
+
+.PATH:	$S/fs/puffs ${.CURDIR}/..
+
+KMOD=	puffs
+
+SRCS=	lkminit_vfs.c
+SRCS+=	puffs_subr.c puffs_msgif.c puffs_vfsops.c puffs_vnops.c
+
+.include <bsd.kmod.mk>
--- sys/lkm/vfs/puffs/lkminit_vfs.c.orig	2006-11-06 00:54:45.000000000 +0100
+++ sys/lkm/vfs/puffs/lkminit_vfs.c	2006-11-06 00:55:46.000000000 +0100
@@ -0,0 +1,108 @@
+/* $NetBSD$ */
+
+/*-
+ * Copyright (c) 1996 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Michael Graff <explorer@flame.org>.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Lubomir Kundrak <lkundrak@skosi.org>.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *        This product includes software developed by the NetBSD
+ *        Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD$");
+
+#include <sys/param.h>
+#include <sys/lkm.h>
+
+static int puffs_dispatch_vfs __P((struct lkm_table *, int, int));
+static int puffs_dispatch_dev __P((struct lkm_table *, int, int));
+int puffs_lkmentry __P((struct lkm_table *, int, int));
+
+/*
+ * The VFS part of module.
+ */
+static int
+puffs_dispatch_vfs(struct lkm_table *lkmtp, int cmd, int ver)
+{
+	extern struct vfsops puffs_vfsops;
+
+	/*
+	 * declare the filesystem
+	 */
+	MOD_VFS("puffs", -1, &puffs_vfsops);
+	lkmtp->private.lkm_any = (void *) &_module;	/* XXX */
+
+	DISPATCH(lkmtp, cmd, ver, lkm_nofunc, lkm_nofunc, lkm_nofunc);
+}
+
+/*
+ * The device part.
+ */
+static int
+puffs_dispatch_dev(struct lkm_table *lkmtp, int cmd, int ver)
+{
+	/*
+	 * declare up/down call device
+	 */
+	extern const struct cdevsw puffs_cdevsw;
+
+	MOD_DEV("puffs", "puffs", NULL, -1, &puffs_cdevsw, -1);
+	lkmtp->private.lkm_any = (void *) &_module;	/* XXX */
+
+	DISPATCH(lkmtp, cmd, ver, lkm_nofunc, lkm_nofunc, lkm_nofunc);
+}
+
+/*
+ * entry point
+ */
+int
+puffs_lkmentry(struct lkm_table *lkmtp, int cmd, int ver)
+{
+	int error = 0;
+
+	switch (cmd) {
+	case LKM_E_UNLOAD:
+	case LKM_E_LOAD:
+		error = puffs_dispatch_dev(lkmtp, cmd, ver);
+		if (error)
+			break;
+		error = puffs_dispatch_vfs(lkmtp, cmd, ver);
+		break;
+	case LKM_E_STAT:
+		error = lkmdispatch(lkmtp, cmd);
+		break;
+	}
+	return error;
+
+}
--- sys/fs/puffs/puffs_sys.h.orig	2006-11-06 00:59:10.000000000 +0100
+++ sys/fs/puffs/puffs_sys.h	2006-11-06 00:59:54.000000000 +0100
@@ -41,6 +41,7 @@
 #include <sys/lock.h>
 #include <sys/queue.h>
 #include <sys/lock.h>
+#include <sys/pool.h>
 
 #include <fs/puffs/puffs_msgif.h>
 
@@ -52,6 +53,8 @@
 extern const struct vnodeopv_desc puffs_specop_opv_desc;
 extern const struct vnodeopv_desc puffs_fifoop_opv_desc;
 
+extern struct pool puffs_pnpool;
+
 /*
  * While a request is going to userspace, park the caller within the
  * kernel.  This is the kernel counterpart of "struct puffs_req".
--- sys/fs/puffs/puffs_vfsops.c.orig	2006-11-06 00:59:10.000000000 +0100
+++ sys/fs/puffs/puffs_vfsops.c	2006-11-06 00:59:55.000000000 +0100
@@ -404,6 +404,11 @@
 void
 puffs_init()
 {
+#ifdef _LKM
+	malloc_type_attach(M_PUFFS);
+	pool_init(&puffs_pnpool, sizeof(struct puffs_node), 0, 0, 0,
+	    "puffspnpl", &pool_allocator_nointr);
+#endif
 
 	return;
 }
@@ -411,6 +416,10 @@
 void
 puffs_done()
 {
+#ifdef _LKM
+	pool_destroy(&puffs_pnpool);
+	malloc_type_detach(M_PUFFS);
+#endif
 
 	return;
 }