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/* $NetBSD: dm_target_error.c,v 1.29 2020/01/21 16:27:53 tkusumi Exp $ */
/*
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Adam Hamsik.
*
* 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>
__KERNEL_RCSID(0, "$NetBSD: dm_target_error.c,v 1.29 2020/01/21 16:27:53 tkusumi Exp $");
/*
* This file implements initial version of device-mapper error target.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/buf.h>
#include "dm.h"
#ifdef DM_TARGET_MODULE
/*
* Every target can be compiled directly to dm driver or as a
* separate module this part of target is used for loading targets
* to dm driver.
* Target can be unloaded from kernel only if there are no users of
* it e.g. there are no devices which uses that target.
*/
#include <sys/kernel.h>
#include <sys/module.h>
MODULE(MODULE_CLASS_MISC, dm_target_error, "dm");
static int
dm_target_error_modcmd(modcmd_t cmd, void *arg)
{
dm_target_t *dmt;
int r;
switch (cmd) {
case MODULE_CMD_INIT:
if ((dmt = dm_target_lookup("error")) != NULL) {
dm_target_unbusy(dmt);
return EEXIST;
}
dmt = dm_target_alloc("error");
dmt->version[0] = 1;
dmt->version[1] = 0;
dmt->version[2] = 0;
dmt->init = &dm_target_error_init;
dmt->strategy = &dm_target_error_strategy;
dmt->destroy = &dm_target_error_destroy;
//dmt->upcall = &dm_target_error_upcall;
r = dm_target_insert(dmt);
break;
case MODULE_CMD_FINI:
r = dm_target_rem("error");
break;
case MODULE_CMD_STAT:
return ENOTTY;
default:
return ENOTTY;
}
return r;
}
#endif
/* Init function called from dm_table_load_ioctl. */
int
dm_target_error_init(dm_table_entry_t *table_en, int argc, char **argv)
{
if (argc != 0) {
printf("Error target takes 0 args, %d given\n", argc);
return EINVAL;
}
printf("Error target init function called!!\n");
table_en->target_config = NULL;
return 0;
}
/* Strategy routine called from dm_strategy. */
int
dm_target_error_strategy(dm_table_entry_t *table_en, struct buf *bp)
{
bp->b_error = EIO;
bp->b_resid = 0;
biodone(bp);
return 0;
}
/* Doesn't do anything here. */
int
dm_target_error_destroy(dm_table_entry_t *table_en)
{
/* Unbusy target so we can unload it */
dm_target_unbusy(table_en->target);
return 0;
}
#if 0
/* Unsupported for this target. */
int
dm_target_error_upcall(dm_table_entry_t *table_en, struct buf *bp)
{
return 0;
}
#endif
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