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dm_target_snapshot.c revision 1.1.2.1 
      1 /*
      2  * Copyright (c) 1996, 1997, 1998, 1999, 2002 The NetBSD Foundation, Inc.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to The NetBSD Foundation
      6  * by Adam Hamsik.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     20  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     21  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     27  * POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 /*
     31  * This file implements initial version of device-mapper snapshot target.
     32  */
     33 #include <sys/types.h>
     34 #include <sys/param.h>
     35 
     36 #include <sys/buf.h>
     37 #include <sys/errno.h>
     38 #include <sys/ioctl.h>
     39 #include <sys/ioccom.h>
     40 #include <sys/kmem.h>
     41 #include <sys/types.h>
     42 #include <sys/param.h>
     43 #include <sys/queue.h>
     44 
     45 #include "dm.h"
     46 
     47 /* Init function called from dm_table_load_ioctl. */
     48 int
     49 dm_target_snapshot_init(struct dm_dev *dmv, void **target_config,
     50 	       	int argc, const  char **argv)
     51 {
     52 
     53 	printf("Snapshot target init function called!!\n");
     54 
     55 	*target_config = NULL;
     56 
     57 
     58 	dmv->dev_type = DM_SNAPSHOT_DEV;
     59 
     60 	return 0;
     61 }
     62 
     63 /* Strategy routine called from dm_strategy. */
     64 int
     65 dm_target_snapshot_strategy(struct dm_table_entry *table_en, struct buf *bp)
     66 {
     67 
     68 	printf("Snapshot 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_snapshot_destroy(struct dm_table_entry *table_en)
     81 {
     82 	return 0;
     83 }
     84 
     85 /* Unsupported for this target. */
     86 int
     87 dm_target_snapshot_upcall(struct dm_table_entry *table_en, struct buf *bp)
     88 {
     89 	return 0;
     90 }
     91