/* $NetBSD: ffs_quota2.c,v 1.7 2020/01/17 20:08:10 ad Exp $ */
/*-
  * Copyright (c) 2010 Manuel Bouyer
  * 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 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: ffs_quota2.c,v 1.7 2020/01/17 20:08:10 ad Exp $");

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/file.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/kauth.h>

#include <ufs/ufs/quota2.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ffs/ffs_extern.h>
#include <ufs/ffs/fs.h>

int
ffs_quota2_mount(struct mount *mp)
{
        struct ufsmount *ump = VFSTOUFS(mp);
        struct fs *fs = ump->um_fs;
        int error;
        struct vnode *vp;
        struct lwp *l = curlwp;

        if ((fs->fs_flags & FS_DOQUOTA2) == 0)
                return 0;

        ump->um_flags |= UFS_QUOTA2;
        ump->umq2_bsize = fs->fs_bsize;
        ump->umq2_bmask = fs->fs_qbmask;
        if (fs->fs_quota_magic != Q2_HEAD_MAGIC) {
                printf("%s: invalid quota magic number\n",
                    mp->mnt_stat.f_mntonname);
                return EINVAL;
        }
        if ((fs->fs_quota_flags & FS_Q2_DO_TYPE(USRQUOTA)) &&
            fs->fs_quotafile[USRQUOTA] == 0) {
                printf("%s: no user quota inode\n",
                    mp->mnt_stat.f_mntonname);
                return EINVAL;
        }
        if ((fs->fs_quota_flags & FS_Q2_DO_TYPE(GRPQUOTA)) &&
            fs->fs_quotafile[GRPQUOTA] == 0) {
                printf("%s: no group quota inode\n",
                    mp->mnt_stat.f_mntonname);
                return EINVAL;
        }

        if (fs->fs_quota_flags & FS_Q2_DO_TYPE(USRQUOTA) &&
            ump->um_quotas[USRQUOTA] == NULLVP) {
                error = VFS_VGET(mp, fs->fs_quotafile[USRQUOTA],
                    LK_EXCLUSIVE, &vp);
                if (error) {
                        printf("%s: can't vget() user quota inode: %d\n",
                            mp->mnt_stat.f_mntonname, error);
                        return error;
                }
                ump->um_quotas[USRQUOTA] = vp;
                ump->um_cred[USRQUOTA] = l->l_cred;
                mutex_enter(vp->v_interlock);
                vp->v_writecount++;
                mutex_exit(vp->v_interlock);
                VOP_UNLOCK(vp);
        }
        if (fs->fs_quota_flags & FS_Q2_DO_TYPE(GRPQUOTA) &&
            ump->um_quotas[GRPQUOTA] == NULLVP) {
                error = VFS_VGET(mp, fs->fs_quotafile[GRPQUOTA],
                    LK_EXCLUSIVE, &vp);
                if (error) {
                        vn_close(ump->um_quotas[USRQUOTA],
                            FREAD|FWRITE, l->l_cred);
                        printf("%s: can't vget() group quota inode: %d\n",
                            mp->mnt_stat.f_mntonname, error);
                        return error;
                }
                ump->um_quotas[GRPQUOTA] = vp;
                ump->um_cred[GRPQUOTA] = l->l_cred;
                mutex_enter(vp->v_interlock);
                vp->v_vflag |= VV_SYSTEM;
                vp->v_writecount++;
                mutex_exit(vp->v_interlock);
                VOP_UNLOCK(vp);
        }

        mp->mnt_flag |= MNT_QUOTA;
        return 0;
}