/* $NetBSD: vfs_syscalls_20.c,v 1.46 2020/06/28 14:37:53 christos Exp $ */

/* $NetBSD: vfs_syscalls_20.c,v 1.46 2020/06/28 14:37:53 christos 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 8.42 (Berkeley) 7/31/95
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vfs_syscalls_20.c,v 1.46 2020/06/28 14:37:53 christos Exp $");

#ifdef _KERNEL_OPT
#include "opt_compat_netbsd.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/uio.h>
#include <sys/dirent.h>
#include <sys/sysctl.h>
#include <sys/syscall.h>
#include <sys/syscallvar.h>
#include <sys/syscallargs.h>
#include <sys/kauth.h>
#include <sys/vfs_syscalls.h>

#include <compat/common/compat_mod.h>

#include <compat/sys/mount.h>
#include <compat/sys/statvfs.h>

static const struct syscall_package vfs_syscalls_20_syscalls[] = {
{ SYS_compat_20_fhstatfs, 0, (sy_call_t *)compat_20_sys_fhstatfs },
{ SYS_compat_20_fstatfs, 0, (sy_call_t *)compat_20_sys_fstatfs },
{ SYS_compat_20_getfsstat, 0, (sy_call_t *)compat_20_sys_getfsstat },
{ SYS_compat_20_statfs, 0, (sy_call_t *)compat_20_sys_statfs },
{ 0, 0, NULL }
};

/*
* Get filesystem statistics.
*/
/* ARGSUSED */
int
compat_20_sys_statfs(struct lwp *l, const struct compat_20_sys_statfs_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(struct statfs12 *) buf;
} */
struct mount *mp;
struct statvfs *sbuf;
int error;
struct vnode *vp;

error = namei_simple_user(SCARG(uap, path),
NSM_FOLLOW_TRYEMULROOT, &vp);
if (error != 0)
return error;

mp = vp->v_mount;

sbuf = STATVFSBUF_GET();
if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0)
goto done;

error = statvfs_to_statfs12_copy(sbuf, SCARG(uap, buf), 0);
done:
vrele(vp);
STATVFSBUF_PUT(sbuf);
return error;
}

/*
* Get filesystem statistics.
*/
/* ARGSUSED */
int
compat_20_sys_fstatfs(struct lwp *l, const struct compat_20_sys_fstatfs_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(struct statfs12 *) buf;
} */
struct file *fp;
struct mount *mp;
struct statvfs *sbuf;
int error;

/* fd_getvnode() will use the descriptor for us */
if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
return (error);
mp = fp->f_vnode->v_mount;
sbuf = STATVFSBUF_GET();
if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0)
goto out;
error = statvfs_to_statfs12_copy(sbuf, SCARG(uap, buf), 0);
out:
fd_putfile(SCARG(uap, fd));
STATVFSBUF_PUT(sbuf);
return error;
}

/*
* Get statistics on all filesystems.
*/
int
compat_20_sys_getfsstat(struct lwp *l, const struct compat_20_sys_getfsstat_args *uap, register_t *retval)
{
/* {
syscallarg(struct statfs12 *) buf;
syscallarg(long) bufsize;
syscallarg(int) flags;
} */
return do_sys_getvfsstat(l, SCARG(uap, buf), SCARG(uap, bufsize),
SCARG(uap, flags), statvfs_to_statfs12_copy,
sizeof(struct statfs12), retval);
}

int
compat_20_sys_fhstatfs(struct lwp *l, const struct compat_20_sys_fhstatfs_args *uap, register_t *retval)
{
/* {
syscallarg(const struct compat_30_fhandle *) fhp;
syscallarg(struct statfs12 *) buf;
} */
struct statvfs *sbuf;
struct compat_30_fhandle fh;
struct mount *mp;
struct vnode *vp;
int error;

/*
* Must be super user
*/
if ((error = kauth_authorize_system(l->l_cred,
KAUTH_SYSTEM_FILEHANDLE, 0, NULL, NULL, NULL)))
return (error);

if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fh))) != 0)
return (error);

if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
return (ESTALE);
error = VFS_FHTOVP(mp, (struct fid*)&fh.fh_fid, LK_EXCLUSIVE, &vp);
if (error != 0)
return (error);
mp = vp->v_mount;
VOP_UNLOCK(vp);
sbuf = STATVFSBUF_GET();
if ((error = VFS_STATVFS(mp, sbuf)) != 0)
goto out;
error = statvfs_to_statfs12_copy(sbuf, SCARG(uap, buf), 0);
out:
vrele(vp);
STATVFSBUF_PUT(sbuf);
return error;
}

int
vfs_syscalls_20_init(void)
{

return syscall_establish(NULL, vfs_syscalls_20_syscalls);
}

int
vfs_syscalls_20_fini(void)
{

return syscall_disestablish(NULL, vfs_syscalls_20_syscalls);
}