/*
 * 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
 * $FreeBSD: src/sys/ufs/ufs/ufs_vfsops.c,v 1.17.2.3 2001/10/14 19:08:16 iedowse Exp $
 */

#include "opt_quota.h"

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/caps.h>
#include <sys/malloc.h>
#include <sys/vnode.h>

#include "quota.h"
#include "inode.h"
#include "ufsmount.h"
#include "ufs_extern.h"

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

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

/*
 * Do operations associated with quotas
 */
int
ufs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg,
             struct ucred *cred)
{
#ifndef QUOTA
        return (EOPNOTSUPP);
#else
        int cmd, type, error;

        type = cmds & SUBCMDMASK;
        cmd = cmds >> SUBCMDSHIFT;

        if (uid == -1) {
                switch(type) {
                        case USRQUOTA:
                                uid = cred->cr_ruid;
                                break;
                        case GRPQUOTA:
                                uid = cred->cr_rgid;
                                break;
                        default:
                                return (EINVAL);
                }
        }
                                        
        /*
         * Check permissions.
         */
        switch (cmd) {

        case Q_QUOTAON:
                error = caps_priv_check(cred, SYSCAP_NOQUOTA_WR);
                break;

        case Q_QUOTAOFF:
                error = caps_priv_check(cred, SYSCAP_NOQUOTA_WR);
                break;

        case Q_SETQUOTA:
                error = caps_priv_check(cred, SYSCAP_NOQUOTA_WR);
                break;

        case Q_SETUSE:
                error = caps_priv_check(cred, SYSCAP_NOQUOTA_WR);
                break;

        case Q_GETQUOTA:
                if (uid == cred->cr_ruid)
                        error = 0;
                else
                        error = caps_priv_check(cred, SYSCAP_RESTRICTEDROOT);
                break;

        case Q_SYNC:
                error = 0;
                break;

        default:
                error = EINVAL;
                break;
        }

        if (error)
                return (error);


        if ((uint)type >= MAXQUOTAS)
                return (EINVAL);
        if (vfs_busy(mp, LK_NOWAIT))
                return (0);

        switch (cmd) {

        case Q_QUOTAON:
                error = ufs_quotaon(cred, mp, type, arg);
                break;

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

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

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

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

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

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

/*
 * Initial UFS filesystems, done only once.
 */
int
ufs_init(struct vfsconf *vfsp)
{
        static int done;

        if (done)
                return (0);
        done = 1;
#ifdef QUOTA
        ufs_dqinit();
#endif
        return (0);
}

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

        error = VFS_VGET(mp, NULL, ufhp->ufid_ino, &nvp);
        if (error) {
                *vpp = NULLVP;
                return (error);
        }
        ip = VTOI(nvp);
        if (ip->i_mode == 0 ||
            ip->i_gen != ufhp->ufid_gen ||
            (VFSTOUFS(mp)->um_i_effnlink_valid ? ip->i_effnlink :
            ip->i_nlink) <= 0) {
                vput(nvp);
                *vpp = NULLVP;
                return (ESTALE);
        }
        *vpp = nvp;
        return (0);
}


/*
 * This is the generic part of fhtovp called after the underlying
 * filesystem has validated the file handle.
 *
 * Verify that a host should have access to a filesystem.
 */
int
ufs_check_export(struct mount *mp, struct sockaddr *nam, int *exflagsp,
                 struct ucred **credanonp)
{
        struct netcred *np;
        struct ufsmount *ump;

        ump = VFSTOUFS(mp);
        /*
         * Get the export permission structure for this <mp, client> tuple.
         */
        np = vfs_export_lookup(mp, &ump->um_export, nam);
        if (np == NULL)
                return (EACCES);

        *exflagsp = np->netc_exflags;
        *credanonp = &np->netc_anon;
        return (0);
}