67de4a9395
This is part of NetBSD's dm design, but unimplemented (all handlers return 0) and also unused.
147 lines
3.7 KiB
C
147 lines
3.7 KiB
C
/* $NetBSD: dm_target_error.c,v 1.29 2020/01/21 16:27:53 tkusumi Exp $ */
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/*
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* Copyright (c) 2008 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Adam Hamsik.
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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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*
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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: dm_target_error.c,v 1.29 2020/01/21 16:27:53 tkusumi Exp $");
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/*
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* This file implements initial version of device-mapper error target.
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/buf.h>
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#include "dm.h"
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#ifdef DM_TARGET_MODULE
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/*
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* Every target can be compiled directly to dm driver or as a
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* separate module this part of target is used for loading targets
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* to dm driver.
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* Target can be unloaded from kernel only if there are no users of
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* it e.g. there are no devices which uses that target.
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*/
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#include <sys/kernel.h>
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#include <sys/module.h>
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MODULE(MODULE_CLASS_MISC, dm_target_error, "dm");
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static int
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dm_target_error_modcmd(modcmd_t cmd, void *arg)
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{
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dm_target_t *dmt;
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int r;
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switch (cmd) {
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case MODULE_CMD_INIT:
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if ((dmt = dm_target_lookup("error")) != NULL) {
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dm_target_unbusy(dmt);
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return EEXIST;
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}
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dmt = dm_target_alloc("error");
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dmt->version[0] = 1;
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dmt->version[1] = 0;
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dmt->version[2] = 0;
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dmt->init = &dm_target_error_init;
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dmt->strategy = &dm_target_error_strategy;
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dmt->destroy = &dm_target_error_destroy;
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//dmt->upcall = &dm_target_error_upcall;
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r = dm_target_insert(dmt);
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break;
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case MODULE_CMD_FINI:
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r = dm_target_rem("error");
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break;
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case MODULE_CMD_STAT:
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return ENOTTY;
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default:
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return ENOTTY;
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}
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return r;
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}
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#endif
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/* Init function called from dm_table_load_ioctl. */
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int
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dm_target_error_init(dm_table_entry_t *table_en, int argc, char **argv)
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{
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if (argc != 0) {
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printf("Error target takes 0 args, %d given\n", argc);
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return EINVAL;
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}
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printf("Error target init function called!!\n");
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table_en->target_config = NULL;
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return 0;
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}
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/* Strategy routine called from dm_strategy. */
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int
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dm_target_error_strategy(dm_table_entry_t *table_en, struct buf *bp)
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{
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bp->b_error = EIO;
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bp->b_resid = 0;
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biodone(bp);
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return 0;
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}
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/* Doesn't do anything here. */
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int
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dm_target_error_destroy(dm_table_entry_t *table_en)
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{
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/* Unbusy target so we can unload it */
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dm_target_unbusy(table_en->target);
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return 0;
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}
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#if 0
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/* Unsupported for this target. */
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int
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dm_target_error_upcall(dm_table_entry_t *table_en, struct buf *bp)
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{
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return 0;
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}
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#endif
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