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dm_target_snapshot.c revision 1.1.2.5 
      1 /*        $NetBSD: dm_target_snapshot.c,v 1.1.2.5 2008/08/19 13:30:36 haad Exp $      */
      2 
      3 /*
      4  * Copyright (c) 1996, 1997, 1998, 1999, 2002 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 snapshot target.
     34  */
     35 #include <sys/types.h>
     36 #include <sys/param.h>
     37 
     38 #include <sys/buf.h>
     39 #include <sys/errno.h>
     40 #include <sys/ioctl.h>
     41 #include <sys/ioccom.h>
     42 #include <sys/kmem.h>
     43 #include <sys/types.h>
     44 #include <sys/param.h>
     45 #include <sys/queue.h>
     46 
     47 #include "dm.h"
     48 
     49 /* Init function called from dm_table_load_ioctl. */
     50 int
     51 dm_target_snapshot_init(struct dm_dev *dmv, void **target_config, char *argv)
     52 {
     53 
     54 	printf("Snapshot target init function called!!\n");
     55 
     56 	*target_config = NULL;
     57 
     58 
     59 	dmv->dev_type = DM_SNAPSHOT_DEV;
     60 
     61 	return 0;
     62 }
     63 
     64 /*
     65  * Status routine is called to get params string, which is target
     66  * specific. When dm_table_status_ioctl is called with flag
     67  * DM_STATUS_TABLE_FLAG I have to sent params string back.
     68  */
     69 char *
     70 dm_target_snapshot_status(void *target_config)
     71 {
     72 	struct target_snapshot_config *tlc;
     73 
     74 	tlc = target_config;
     75 
     76 	printf("Snapshot target status function called\n");
     77 
     78 	return 0;
     79 }
     80 
     81 /* Strategy routine called from dm_strategy. */
     82 int
     83 dm_target_snapshot_strategy(struct dm_table_entry *table_en, struct buf *bp)
     84 {
     85 
     86 	printf("Snapshot target read function called!!\n");
     87 
     88 	bp->b_error = EIO;
     89 	bp->b_resid = 0;
     90 
     91 	biodone(bp);
     92 
     93 	return 0;
     94 }
     95 
     96 /* Doesn't do anything here. */
     97 int
     98 dm_target_snapshot_destroy(struct dm_table_entry *table_en)
     99 {
    100 	table_en->target_config = NULL;
    101 
    102 	return 0;
    103 }
    104 
    105 /* Unsupported for this target. */
    106 int
    107 dm_target_snapshot_upcall(struct dm_table_entry *table_en, struct buf *bp)
    108 {
    109 	return 0;
    110 }
    111