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/* $OpenBSD: union_lkm.c,v 1.3 2002/02/17 19:42:26 millert Exp $ */
/*
* union_lkm.c (was: kernfsmod.c)
*
* 05 Jun 93 Terry Lambert Original
* 20 Jan 97 Michael Shalayeff NetBSD PR
* by Paul Goyette <paul@pgoyette.bdt.com>
*
* Copyright (c) 1993 Terrence R. Lambert.
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Terrence R. Lambert.
* 4. The name Terrence R. Lambert may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY TERRENCE R. LAMBERT ``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 TERRENCE R. LAMBERT 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.
*
* from Id: kernfsmod.c,v 1.1.1.1 1995/10/18 08:44:22 deraadt Exp
*/
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/mount.h>
#include <sys/exec.h>
#include <sys/lkm.h>
#include <sys/file.h>
#include <sys/errno.h>
#include <sys/namei.h>
/*
* This is the vfsops table from /sys/miscfs/union/union_vfsops.c
*/
extern struct vfsops union_vfsops;
extern struct vnodeopv_desc union_vnodeop_opv_desc;
extern int (*union_check_p)(off_t, struct proc *, struct vnode *,
struct file *, struct uio, int *);
extern int union_check(off_t, struct proc *, struct vnode *, struct file *,
struct uio, int *);
static int union_load(struct lkm_table *, int);
/*
* declare the filesystem
*/
MOD_VFS("union", -1, &union_vfsops)
/*
* Routine to execute when module is loaded or unloaded. We need to set
* a couple of critical pointers for the vfs_syscalls routines.
*/
static int
union_load(lkmtp, cmd)
struct lkm_table *lkmtp;
int cmd;
{
switch (cmd) {
case LKM_E_LOAD:
union_check_p = union_check;
break;
case LKM_E_UNLOAD:
union_check_p = NULL;
break;
};
return (0);
}
/*
* LKM entry point
* (named this way to avoid keyword collision)
*/
int
unionfs(lkmtp, cmd, ver)
struct lkm_table *lkmtp;
int cmd;
int ver;
{
/*
* This is normally done automatically at boot time if the
* opv_desc is listed in vfs_opv_descs[] in vfs_conf.c. For
* loaded modules, we have to do it manually.
*/
vfs_opv_init_explicit(&union_vnodeop_opv_desc);
vfs_opv_init_default(&union_vnodeop_opv_desc);
DISPATCH(lkmtp, cmd, ver, union_load, union_load, lkm_nofunc)
}
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