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Add the ability to run puffs in userspace.  This means that puffs
can now be developed in userspace using puffs for development
(I hate emulators, they are annoyingly clumsy).

To e.g. mount psshfs using puffs-on-puffs, run fs/bin/syspuffs/syspuffs
with the regular mount_psshfs command line as an argument:

    golem> ./syspuffs /usr/sbin/mount_psshfs ftp.netbsd.org:/pub /puffs

This will make the mount appear as usual, with the exception that the
requests will be passed through puffs both in the kernel and userspace:

    ftp.netbsd.org:/pub on /puffs type puffs|p2k|puffs|psshfs

/*	$NetBSD: syspuffs.c,v 1.1 2008/01/02 18:15:12 pooka Exp $	*/

/*
 * Copyright (c) 2008 Antti Kantee.  All Rights Reserved.
 *
 * Development of this software was supported by the
 * Research Foundation of Helsinki University of Technology
 *
 * 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 <sys/socket.h>

#include <assert.h>
#include <err.h>
#include <paths.h>
#include <puffs.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "p2k.h"
#include "puffs_rumpglue.h"

static void
usage(void)
{

	errx(1, "usage: %s file_server [fs opts] dev mountpath", getprogname());
}

int
main(int argc, char *argv[])
{
	struct puffs_kargs kargs;
	extern char **environ;
	char *mntpath, *fromname;
	size_t len;
	char comfd[16];
	int sv[2];
	int mntflags, pflags, rv;

#if 1
	extern int puffsdebug;
	extern int putterdebug;

	puffsdebug = putterdebug = 1;
#endif

	setprogname(argv[0]);

	if (argc < 2)
		usage();

	/* Create sucketpair for communication with the real file server */
	if (socketpair(PF_LOCAL, SOCK_STREAM, 0, sv) == -1)
		err(1, "socketpair");
	snprintf(comfd, sizeof(sv[0]), "%d", sv[0]);
	if (setenv("PUFFS_COMFD", comfd, 1) == -1)
		err(1, "setenv");

	switch (fork()) {
	case 0:
		argv++;
		if (execve(argv[0], argv, environ) == -1)
			err(1, "execvp");
		/*NOTREACHED*/
	case -1:
		err(1, "fork");
		/*NOTREACHED*/
	default:
		unsetenv("PUFFS_COMFD");
		break;
	}

	/* read args */
	if (read(sv[1], &len, sizeof(len)) != sizeof(len))
		err(1, "mp 1");
	mntpath = malloc(len);
	if (mntpath == NULL)
		err(1, "malloc %zu", len);
	if (read(sv[1], mntpath, len) != len)
		err(1, "mp 2");
	if (read(sv[1], &len, sizeof(len)) != sizeof(len))
		err(1, "fn 1");
	fromname = malloc(len);
	if (fromname == NULL)
		err(1, "malloc %zu", len);
	if (read(sv[1], fromname, len) != len)
		err(1, "fn 2");
	if (read(sv[1], &mntflags, sizeof(mntflags)) != sizeof(mntflags))
		err(1, "mntflags");
	if (read(sv[1], &kargs, sizeof(kargs)) != sizeof(kargs))
		err(1, "puffs_args");
	if (read(sv[1], &pflags, sizeof(kargs)) != sizeof(pflags))
		err(1, "pflags");

	/* XXX: some adjustments */
	pflags |= PUFFS_KFLAG_NOCACHE;
	pflags &= ~PUFFS_FLAG_BUILDPATH;

	rv = puffs_rumpglue_init(sv[1], &kargs.pa_fd);
	assert(rv == 0);
	rv = p2k_run_fs(MOUNT_PUFFS, fromname, mntpath, mntflags, 
		&kargs, sizeof(kargs), pflags);
	if (rv)
		err(1, "mount");

	return 0;
}