/*      $NetBSD: zfs.c,v 1.1 2022/06/19 11:31:19 simonb Exp $   */

/*-
* Copyright (c) 2022 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Simon Burge.
*
* 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>
__RCSID("$NetBSD: zfs.c,v 1.1 2022/06/19 11:31:19 simonb Exp $");

#include <sys/param.h>
#include <sys/time.h>
#include <sys/vnode.h>
#define __EXPOSE_MOUNT
#include <sys/mount.h>

#include "zfs_znode.h"

#include <kvm.h>
#include <err.h>
#include "fstat.h"

int
zfs_filestat(struct vnode *vp, struct filestat *fsp)
{
       znode_t inode;
       struct mount mt;

       if (!KVM_READ(VTOZ(vp), &inode, sizeof (inode))) {
               dprintf("can't read inode at %p for pid %d", VTOZ(vp), Pid);
               return 0;
       }
       if (!KVM_READ(vp->v_mount, &mt, sizeof(mt))) {
               dprintf("can't read mount at %p for pid %d",
                   vp->v_mount, Pid);
               return 0;
       }
       /*
        * XXX: fsid should be something like
        *    ((struct zfsvfs *)vp->v_mount->mnt_data)->
        *    z_os->os_ds_dataset->ds_fsid_guid
        * but ZFS headers are pretty much impossible to include
        * from userland.
        */
       fsp->fsid = mt.mnt_stat.f_fsidx.__fsid_val[0];
       fsp->fileid = inode.z_id;
       fsp->mode = inode.z_mode;
       fsp->size = inode.z_size;
       fsp->rdev = 0;
       return 1;
}