/*      $NetBSD: compat_sysctl_09_43.c,v 1.6 2020/03/26 13:39:29 pgoyette Exp $ */

/*
* Copyright (c) 1989, 1993
*      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.
*
*      @(#)vfs_syscalls.c      8.28 (Berkeley) 12/10/94
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: compat_sysctl_09_43.c,v 1.6 2020/03/26 13:39:29 pgoyette Exp $");

#if defined(_KERNEL_OPT)
#include "opt_compat_netbsd.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/sysctl.h>
#include <sys/module.h>

#include <sys/mount.h>
#include <sys/syscall.h>
#include <sys/syscallvar.h>
#include <sys/syscallargs.h>
#include <sys/vfs_syscalls.h>

#include <compat/sys/mount.h>
#include <compat/common/compat_mod.h>

/*
* sysctl helper routine for vfs.generic.conf lookups.
*/
#if defined(COMPAT_09) || defined(COMPAT_43) || defined(COMPAT_44)

static int
sysctl_vfs_generic_conf(SYSCTLFN_ARGS)
{
       struct vfsconf vfc;
       struct sysctlnode node;
       struct vfsops *vfsp;
       u_int vfsnum;

       if (namelen != 1)
               return (ENOTDIR);
       vfsnum = name[0];
       if (vfsnum >= nmountcompatnames ||
           mountcompatnames[vfsnum] == NULL)
               return (EOPNOTSUPP);
       vfsp = vfs_getopsbyname(mountcompatnames[vfsnum]);
       if (vfsp == NULL)
               return (EOPNOTSUPP);

       vfc.vfc_vfsops = vfsp;
       strncpy(vfc.vfc_name, vfsp->vfs_name, sizeof(vfc.vfc_name));
       vfc.vfc_typenum = vfsnum;
       vfc.vfc_refcount = vfsp->vfs_refcount;
       vfc.vfc_flags = 0;
       vfc.vfc_mountroot = vfsp->vfs_mountroot;
       vfc.vfc_next = NULL;
       vfs_delref(vfsp);

       node = *rnode;
       node.sysctl_data = &vfc;
       return (sysctl_lookup(SYSCTLFN_CALL(&node)));
}

/*
* Top level filesystem related information gathering.
*/
SYSCTL_SETUP(compat_sysctl_vfs, "Top-level filesystem info")
{
       int error;

       error = sysctl_createv(clog, 0, NULL, NULL,
                       CTLFLAG_PERMANENT,
                       CTLTYPE_NODE, "generic",
                       SYSCTL_DESCR("Non-specific vfs related information"),
                       NULL, 0, NULL, 0,
                       CTL_VFS, VFS_GENERIC, CTL_EOL);
       if (error == EEXIST)
               error = 0;
       if (error != 0)
               return;

       error = sysctl_createv(clog, 0, NULL, NULL,
                      CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
                      CTLTYPE_INT, "maxtypenum",
                      SYSCTL_DESCR("Highest valid filesystem type number"),
                      NULL, nmountcompatnames, NULL, 0,
                      CTL_VFS, VFS_GENERIC, VFS_MAXTYPENUM, CTL_EOL);
       if (error == EEXIST)
               error = 0;
       if (error != 0)
               return;

       error = sysctl_createv(clog, 0, NULL, NULL,
                      CTLFLAG_PERMANENT,
                      CTLTYPE_STRUCT, "conf",
                      SYSCTL_DESCR("Filesystem configuration information"),
                      sysctl_vfs_generic_conf, 0, NULL,
                      sizeof(struct vfsconf),
                      CTL_VFS, VFS_GENERIC, VFS_CONF, CTL_EOL);
}
#endif

int
compat_sysctl_09_43_init(void)
{

       return 0;
}

int
compat_sysctl_09_43_fini(void)
{

       return 0;
}

MODULE (MODULE_CLASS_EXEC, compat_sysctl_09_43, NULL);

static int
compat_sysctl_09_43_modcmd(modcmd_t cmd, void *arg)
{

       switch (cmd) {
       case MODULE_CMD_INIT:
               return compat_sysctl_09_43_init();
       case MODULE_CMD_FINI:
               return compat_sysctl_09_43_fini();
       default:
               return ENOTTY;
       }
}