/*	$NetBSD: ufs_vfsops.c,v 1.26.12.1 2006/05/24 15:50:48 tron Exp $	*/

/*
 * Copyright (c) 1991, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * 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. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 *
 *	@(#)ufs_vfsops.c	8.8 (Berkeley) 5/20/95
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ufs_vfsops.c,v 1.26.12.1 2006/05/24 15:50:48 tron Exp $");

#if defined(_KERNEL_OPT)
#include "opt_ffs.h"
#include "opt_quota.h"
#endif

#include <sys/param.h>
#include <sys/mbuf.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <sys/kauth.h>

#include <miscfs/specfs/specdev.h>

#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>
#ifdef UFS_DIRHASH
#include <ufs/ufs/dirhash.h>
#endif

/* how many times ufs_init() was called */
static int ufs_initcount = 0;

POOL_INIT(ufs_direct_pool, sizeof(struct direct), 0, 0, 0, "ufsdirpl",
    &pool_allocator_nointr);

/*
 * Make a filesystem operational.
 * Nothing to do at the moment.
 */
/* ARGSUSED */
int
ufs_start(struct mount *mp, int flags, struct lwp *l)
{

	return (0);
}

/*
 * Return the root of a filesystem.
 */
int
ufs_root(struct mount *mp, struct vnode **vpp)
{
	struct vnode *nvp;
	int error;

	if ((error = VFS_VGET(mp, (ino_t)ROOTINO, &nvp)) != 0)
		return (error);
	*vpp = nvp;
	return (0);
}

/*
 * Do operations associated with quotas
 */
int
ufs_quotactl(struct mount *mp, int cmds, uid_t uid, void *arg, struct lwp *l)
{

#ifndef QUOTA
	return (EOPNOTSUPP);
#else
	int cmd, type, error;
	struct proc *p;

	p = l->l_proc;
	if (uid == -1)
		uid = kauth_cred_getuid(p->p_cred);
	cmd = cmds >> SUBCMDSHIFT;

	switch (cmd) {
	case Q_SYNC:
		break;
	case Q_GETQUOTA:
		if (uid == kauth_cred_getuid(p->p_cred))
			break;
		/* fall through */
	default:
		if ((error = kauth_authorize_generic(p->p_cred, KAUTH_GENERIC_ISSUSER,
					       &p->p_acflag)) != 0)
			return (error);
	}

	type = cmds & SUBCMDMASK;
	if ((u_int)type >= MAXQUOTAS)
		return (EINVAL);
	if (vfs_busy(mp, LK_NOWAIT, 0))
		return (0);

	switch (cmd) {

	case Q_QUOTAON:
		error = quotaon(l, mp, type, arg);
		break;

	case Q_QUOTAOFF:
		error = quotaoff(l, mp, type);
		break;

	case Q_SETQUOTA:
		error = setquota(mp, uid, type, arg);
		break;

	case Q_SETUSE:
		error = setuse(mp, uid, type, arg);
		break;

	case Q_GETQUOTA:
		error = getquota(mp, uid, type, arg);
		break;

	case Q_SYNC:
		error = qsync(mp);
		break;

	default:
		error = EINVAL;
	}
	vfs_unbusy(mp);
	return (error);
#endif
}

/*
 * This is the generic part of fhtovp called after the underlying
 * filesystem has validated the file handle.
 */
int
ufs_fhtovp(struct mount *mp, struct ufid *ufhp, struct vnode **vpp)
{
	struct vnode *nvp;
	struct inode *ip;
	int error;

	if ((error = VFS_VGET(mp, ufhp->ufid_ino, &nvp)) != 0) {
		*vpp = NULLVP;
		return (error);
	}
	ip = VTOI(nvp);
	if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen) {
		vput(nvp);
		*vpp = NULLVP;
		return (ESTALE);
	}
	*vpp = nvp;
	return (0);
}

/*
 * Initialize UFS filesystems, done only once.
 */
void
ufs_init(void)
{
	if (ufs_initcount++ > 0)
		return;

#ifdef _LKM
	pool_init(&ufs_direct_pool, sizeof(struct direct), 0, 0, 0, "ufsdirpl",
	    &pool_allocator_nointr);
#endif

	ufs_ihashinit();
#ifdef QUOTA
	dqinit();
#endif
#ifdef UFS_DIRHASH
	ufsdirhash_init();
#endif
}

void
ufs_reinit(void)
{
	ufs_ihashreinit();
#ifdef QUOTA
	dqreinit();
#endif
}

/*
 * Free UFS filesystem resources, done only once.
 */
void
ufs_done(void)
{
	if (--ufs_initcount > 0)
		return;

	ufs_ihashdone();
#ifdef QUOTA
	dqdone();
#endif
#ifdef _LKM
	pool_destroy(&ufs_direct_pool);
#endif
#ifdef UFS_DIRHASH
	ufsdirhash_done();
#endif
}