Add kernfs server.

Don't build & install it by default, since it represents the state
of the rump virtual kernel and not the host kernel.  However, it's
useful for debugging kernfs.

usr.sbin/puffs/Makefile

@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile,v 1.12 2010/03/08 12:48:31 pooka Exp $
+#	$NetBSD: Makefile,v 1.13 2010/03/31 14:22:27 pooka Exp $
 
 SUBDIR=	mount_9p mount_psshfs mount_sysctlfs
 
@@ -14,6 +14,9 @@ SUBDIR+=rump_tmpfs rump_udf
 # and is therefore not useful for the average user
 #SUBDIR+=rump_fdesc
 
+# ditto for kernfs
+#SUBDIR+=rump_kernfs
+
 # rump_mqmfs is just another ffs, useful mainly for debugging
 #SUBDIR+=rump_nqmfs
 

usr.sbin/puffs/rump_kernfs/Makefile

@@ -0,0 +1,8 @@
+#	$NetBSD: Makefile,v 1.1 2010/03/31 14:22:27 pooka Exp $
+#
+
+MOUNTNAME=	kernfs
+
+ISRUMP=		# syndicate
+
+.include <bsd.prog.mk>

usr.sbin/puffs/rump_kernfs/rump_kernfs.c

@@ -0,0 +1,57 @@
+/*	$NetBSD: rump_kernfs.c,v 1.1 2010/03/31 14:22:27 pooka Exp $	*/
+
+/*
+ * Copyright (c) 2008 Antti Kantee.  All Rights Reserved.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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/types.h>
+#include <sys/mount.h>
+
+#include <err.h>
+#include <puffs.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <rump/p2k.h>
+
+#include "mount_kernfs.h"
+
+int
+main(int argc, char *argv[])
+{
+	char canon_dev[MAXPATHLEN], canon_dir[MAXPATHLEN];
+	int mntflags;
+	int rv;
+
+	setprogname(argv[0]);
+
+	mount_kernfs_parseargs(argc, argv, NULL, &mntflags,
+	    canon_dev, canon_dir);
+	rv = p2k_run_fs(MOUNT_KERNFS, canon_dev, canon_dir, mntflags,
+		NULL, 0, PUFFS_KFLAG_NOCACHE);
+	if (rv)
+		err(1, "mount");
+
+	return 0;
+}