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dm_target_zero.c revision 1.1.2.10 
      1  1.1.2.10  haad /*        $NetBSD: dm_target_zero.c,v 1.1.2.10 2008/11/02 00:02:32 haad Exp $      */
      2   1.1.2.6  haad 
      3   1.1.2.1  haad /*
      4   1.1.2.1  haad  * Copyright (c) 1996, 1997, 1998, 1999, 2002 The NetBSD Foundation, Inc.
      5   1.1.2.1  haad  * All rights reserved.
      6   1.1.2.1  haad  *
      7   1.1.2.1  haad  * This code is derived from software contributed to The NetBSD Foundation
      8   1.1.2.1  haad  * by Adam Hamsik.
      9   1.1.2.1  haad  *
     10   1.1.2.1  haad  * Redistribution and use in source and binary forms, with or without
     11   1.1.2.1  haad  * modification, are permitted provided that the following conditions
     12   1.1.2.1  haad  * are met:
     13   1.1.2.1  haad  * 1. Redistributions of source code must retain the above copyright
     14   1.1.2.1  haad  *    notice, this list of conditions and the following disclaimer.
     15   1.1.2.1  haad  * 2. Redistributions in binary form must reproduce the above copyright
     16   1.1.2.1  haad  *    notice, this list of conditions and the following disclaimer in the
     17   1.1.2.1  haad  *    documentation and/or other materials provided with the distribution.
     18   1.1.2.1  haad  *
     19   1.1.2.1  haad  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20   1.1.2.1  haad  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21   1.1.2.1  haad  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22   1.1.2.1  haad  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23   1.1.2.1  haad  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24   1.1.2.1  haad  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25   1.1.2.1  haad  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26   1.1.2.1  haad  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27   1.1.2.1  haad  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28   1.1.2.1  haad  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29   1.1.2.1  haad  * POSSIBILITY OF SUCH DAMAGE.
     30   1.1.2.1  haad  */
     31   1.1.2.1  haad 
     32   1.1.2.1  haad 
     33   1.1.2.1  haad /*
     34   1.1.2.1  haad  * This file implements initial version of device-mapper zero target.
     35   1.1.2.1  haad  */
     36   1.1.2.1  haad #include <sys/types.h>
     37   1.1.2.1  haad #include <sys/param.h>
     38   1.1.2.1  haad 
     39   1.1.2.1  haad #include <sys/buf.h>
     40   1.1.2.1  haad 
     41   1.1.2.1  haad #include "dm.h"
     42   1.1.2.1  haad 
     43   1.1.2.1  haad /*
     44   1.1.2.1  haad  * Zero target init function. This target doesn't need
     45   1.1.2.1  haad  * target specific config area.
     46   1.1.2.1  haad  */
     47   1.1.2.1  haad int
     48  1.1.2.10  haad dm_target_zero_init(dm_dev_t *dmv, void **target_config, char *argv)
     49   1.1.2.1  haad {
     50   1.1.2.1  haad 
     51   1.1.2.1  haad 	printf("Zero target init function called!!\n");
     52   1.1.2.1  haad 
     53   1.1.2.3  haad 	dmv->dev_type = DM_ZERO_DEV;
     54   1.1.2.3  haad 
     55   1.1.2.1  haad 	*target_config = NULL;
     56   1.1.2.1  haad 
     57   1.1.2.1  haad 	return 0;
     58   1.1.2.1  haad }
     59   1.1.2.1  haad 
     60   1.1.2.5  haad /* Status routine called to get params string. */
     61   1.1.2.5  haad char *
     62   1.1.2.5  haad dm_target_zero_status(void *target_config)
     63   1.1.2.5  haad {
     64   1.1.2.5  haad 	return NULL;
     65   1.1.2.5  haad }
     66   1.1.2.5  haad 
     67   1.1.2.5  haad 
     68   1.1.2.1  haad /*
     69   1.1.2.1  haad  * This routine does IO operations.
     70   1.1.2.1  haad  */
     71   1.1.2.1  haad int
     72  1.1.2.10  haad dm_target_zero_strategy(dm_table_entry_t *table_en, struct buf *bp)
     73   1.1.2.1  haad {
     74   1.1.2.1  haad 
     75   1.1.2.9  haad 	/* printf("Zero target read function called %d!!\n", bp->b_bcount); */
     76   1.1.2.1  haad 
     77   1.1.2.1  haad 	memset(bp->b_data, 0, bp->b_bcount);
     78   1.1.2.1  haad 	bp->b_resid = 0; /* nestiobuf_done wants b_resid = 0 to be sure
     79   1.1.2.1  haad 			    that there is no other io to done  */
     80   1.1.2.1  haad 
     81   1.1.2.1  haad 	biodone(bp);
     82   1.1.2.1  haad 
     83   1.1.2.1  haad 	return 0;
     84   1.1.2.1  haad }
     85   1.1.2.1  haad 
     86   1.1.2.1  haad /* Doesn't not need to do anything here. */
     87   1.1.2.1  haad int
     88  1.1.2.10  haad dm_target_zero_destroy(dm_table_entry_t *table_en)
     89   1.1.2.1  haad {
     90   1.1.2.5  haad 	table_en->target_config = NULL;
     91   1.1.2.5  haad 
     92   1.1.2.1  haad 	return 0;
     93   1.1.2.1  haad }
     94   1.1.2.1  haad 
     95   1.1.2.8  haad /* Doesn't not need to do anything here. */
     96   1.1.2.8  haad int
     97  1.1.2.10  haad dm_target_zero_deps(dm_table_entry_t *table_en, prop_array_t prop_array)
     98   1.1.2.8  haad {
     99   1.1.2.8  haad 	return 0;
    100   1.1.2.8  haad }
    101   1.1.2.8  haad 
    102   1.1.2.1  haad /* Unsuported for this target. */
    103   1.1.2.1  haad int
    104  1.1.2.10  haad dm_target_zero_upcall(dm_table_entry_t *table_en, struct buf *bp)
    105   1.1.2.1  haad {
    106   1.1.2.1  haad 	return 0;
    107   1.1.2.1  haad }
    108   1.1.2.1  haad 
    109