164 lines
4.4 KiB
C
164 lines
4.4 KiB
C
/* $NetBSD: lkminit_vfs.c,v 1.9 2004/05/20 06:34:30 atatat Exp $ */
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/*-
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* Copyright (c) 2000 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: lkminit_vfs.c,v 1.9 2004/05/20 06:34:30 atatat Exp $");
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <sys/ioctl.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/mount.h>
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#include <sys/exec.h>
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#include <sys/lkm.h>
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#include <sys/file.h>
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#include <sys/errno.h>
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#ifndef LFS
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# define LFS
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#endif
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#include <sys/syscall.h>
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#include <sys/sa.h>
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#include <sys/syscallargs.h>
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#include <ufs/lfs/lfs_extern.h>
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int lfs_lkmentry __P((struct lkm_table *, int, int));
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static int lfs_load __P((struct lkm_table *, int));
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static int lfs_unload __P((struct lkm_table *, int));
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static struct sysctllog *_lfs_log;
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#define LFS_SYSENT_CNT 4
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static const struct {
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int sysno;
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struct sysent sysent;
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} lfs_sysents[LFS_SYSENT_CNT] = {
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{ SYS_lfs_bmapv,
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{ 3, sizeof(struct sys_lfs_bmapv_args), 0,
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sys_lfs_bmapv } },
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{ SYS_lfs_markv,
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{ 3, sizeof(struct sys_lfs_markv_args), 0,
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sys_lfs_markv } },
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{ SYS_lfs_segclean,
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{ 2, sizeof(struct sys_lfs_segclean_args), 0,
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sys_lfs_segclean } },
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{ SYS_lfs_segwait,
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{ 2, sizeof(struct sys_lfs_segwait_args), 0,
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sys_lfs_segwait } },
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};
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static struct sysent lfs_osysent[LFS_SYSENT_CNT];
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/*
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* This is the vfsops table for the file system in question
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*/
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extern struct vfsops lfs_vfsops;
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/*
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* declare the filesystem
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*/
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MOD_VFS("lfs", -1, &lfs_vfsops);
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/*
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* entry point
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*/
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int
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lfs_lkmentry(lkmtp, cmd, ver)
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struct lkm_table *lkmtp;
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int cmd;
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int ver;
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{
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DISPATCH(lkmtp, cmd, ver, lfs_load, lfs_unload, lkm_nofunc);
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}
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/*
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* Insert lfs sycalls entries into sysent[].
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*/
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static int
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lfs_load(lkmtp, cmd)
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struct lkm_table *lkmtp;
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int cmd;
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{
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int i;
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/* first check if the entries are empty */
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for(i=0; i < LFS_SYSENT_CNT; i++) {
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if (sysent[lfs_sysents[i].sysno].sy_call != sys_nosys) {
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printf("LKM lfs_load(): lfs syscall %d already used\n",
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lfs_sysents[i].sysno);
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return EEXIST;
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}
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}
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/* now, put in the lfs syscalls */
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for(i=0; i < LFS_SYSENT_CNT; i++) {
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lfs_osysent[i] = sysent[lfs_sysents[i].sysno];
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sysent[lfs_sysents[i].sysno] = lfs_sysents[i].sysent;
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}
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sysctl_vfs_lfs_setup(&_lfs_log);
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return 0;
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}
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/*
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* Remove lfs sycalls entries from sysent[].
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*/
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static int
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lfs_unload(lkmtp, cmd)
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struct lkm_table *lkmtp;
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int cmd;
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{
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int i;
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sysctl_teardown(&_lfs_log);
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/* reset lfs syscall entries back to nosys */
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for(i=0; i < LFS_SYSENT_CNT; i++) {
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if (sysent[lfs_sysents[i].sysno].sy_call !=
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lfs_sysents[i].sysent.sy_call) {
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panic("LKM lfs_unload(): syscall %d not lfs syscall",
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lfs_sysents[i].sysno);
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}
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sysent[lfs_sysents[i].sysno] = lfs_osysent[i];
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}
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return 0;
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}
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