/* $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;
}