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dm_target_error.c revision 1.3 
      1 /*        $NetBSD: dm_target_error.c,v 1.3 2008/12/19 16:30:41 haad Exp $      */
      2 
      3 /*
      4  * Copyright (c) 2008 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Adam Hamsik.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * This file implements initial version of device-mapper error target.
     34  */
     35 #include <sys/types.h>
     36 #include <sys/param.h>
     37 
     38 #include <sys/buf.h>
     39 
     40 #include "dm.h"
     41 
     42 /* Init function called from dm_table_load_ioctl. */
     43 int
     44 dm_target_error_init(dm_dev_t *dmv, void **target_config, char *argv)
     45 {
     46 
     47 	printf("Error target init function called!!\n");
     48 
     49 	*target_config = NULL;
     50 
     51 	dmv->dev_type = DM_ERROR_DEV;
     52 
     53 	return 0;
     54 }
     55 
     56 /* Status routine called to get params string. */
     57 char *
     58 dm_target_error_status(void *target_config)
     59 {
     60 	return NULL;
     61 }
     62 
     63 /* Strategy routine called from dm_strategy. */
     64 int
     65 dm_target_error_strategy(dm_table_entry_t *table_en, struct buf *bp)
     66 {
     67 
     68 	printf("Error target read function called!!\n");
     69 
     70 	bp->b_error = EIO;
     71 	bp->b_resid = 0;
     72 
     73 	biodone(bp);
     74 
     75 	return 0;
     76 }
     77 
     78 /* Doesn't do anything here. */
     79 int
     80 dm_target_error_destroy(dm_table_entry_t *table_en)
     81 {
     82 	table_en->target_config = NULL;
     83 
     84 	/* Unbusy target so we can unload it */
     85 	dm_target_unbusy(table_en->target);
     86 
     87 	return 0;
     88 }
     89 
     90 /* Doesn't not need to do anything here. */
     91 int
     92 dm_target_error_deps(dm_table_entry_t *table_en, prop_array_t prop_array)
     93 {
     94 	return 0;
     95 }
     96 
     97 /* Unsupported for this target. */
     98 int
     99 dm_target_error_upcall(dm_table_entry_t *table_en, struct buf *bp)
    100 {
    101 	return 0;
    102 }
    103