xref: /dflybsd-src/sys/dev/disk/dm/mirror/dm_target_mirror.c (revision c662db9a18424b81164b14d2f9a06c43261ff5ce)
1*f603807bSTomohiro Kusumi /*$NetBSD: dm_target_mirror.c,v 1.8 2010/01/04 00:12:22 haad Exp $*/
2*f603807bSTomohiro Kusumi 
3*f603807bSTomohiro Kusumi /*
4*f603807bSTomohiro Kusumi  * Copyright (c) 2009 The NetBSD Foundation, Inc.
5*f603807bSTomohiro Kusumi  * All rights reserved.
6*f603807bSTomohiro Kusumi  *
7*f603807bSTomohiro Kusumi  * This code is derived from software contributed to The NetBSD Foundation
8*f603807bSTomohiro Kusumi  * by Adam Hamsik.
9*f603807bSTomohiro Kusumi  *
10*f603807bSTomohiro Kusumi  * Redistribution and use in source and binary forms, with or without
11*f603807bSTomohiro Kusumi  * modification, are permitted provided that the following conditions
12*f603807bSTomohiro Kusumi  * are met:
13*f603807bSTomohiro Kusumi  * 1. Redistributions of source code must retain the above copyright
14*f603807bSTomohiro Kusumi  *    notice, this list of conditions and the following disclaimer.
15*f603807bSTomohiro Kusumi  * 2. Redistributions in binary form must reproduce the above copyright
16*f603807bSTomohiro Kusumi  *    notice, this list of conditions and the following disclaimer in the
17*f603807bSTomohiro Kusumi  *    documentation and/or other materials provided with the distribution.
18*f603807bSTomohiro Kusumi  *
19*f603807bSTomohiro Kusumi  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20*f603807bSTomohiro Kusumi  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21*f603807bSTomohiro Kusumi  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22*f603807bSTomohiro Kusumi  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23*f603807bSTomohiro Kusumi  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24*f603807bSTomohiro Kusumi  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25*f603807bSTomohiro Kusumi  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26*f603807bSTomohiro Kusumi  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27*f603807bSTomohiro Kusumi  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28*f603807bSTomohiro Kusumi  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29*f603807bSTomohiro Kusumi  * POSSIBILITY OF SUCH DAMAGE.
30*f603807bSTomohiro Kusumi  */
31*f603807bSTomohiro Kusumi 
32*f603807bSTomohiro Kusumi /*
33*f603807bSTomohiro Kusumi  * This file implements initial version of device-mapper mirror target.
34*f603807bSTomohiro Kusumi  */
35*f603807bSTomohiro Kusumi #include <dev/disk/dm/dm.h>
36*f603807bSTomohiro Kusumi 
37*f603807bSTomohiro Kusumi typedef struct target_mirror_config {
38*f603807bSTomohiro Kusumi #define MAX_MIRROR_COPIES 4
39*f603807bSTomohiro Kusumi 	dm_pdev_t *orig;
40*f603807bSTomohiro Kusumi 	dm_pdev_t *copies[MAX_MIRROR_COPIES];
41*f603807bSTomohiro Kusumi 
42*f603807bSTomohiro Kusumi 	/* copied blocks bitmaps administration etc*/
43*f603807bSTomohiro Kusumi 	dm_pdev_t *log_pdev;	/* for administration */
44*f603807bSTomohiro Kusumi 	uint64_t log_regionsize;	/* blocksize of mirror */
45*f603807bSTomohiro Kusumi 
46*f603807bSTomohiro Kusumi 	/* list of parts that still need copied etc.; run length encoded? */
47*f603807bSTomohiro Kusumi } dm_target_mirror_config_t;
48*f603807bSTomohiro Kusumi 
49*f603807bSTomohiro Kusumi int dm_target_mirror_init(dm_table_entry_t *, int, char **);
50*f603807bSTomohiro Kusumi char *dm_target_mirror_table(void *);
51*f603807bSTomohiro Kusumi int dm_target_mirror_strategy(dm_table_entry_t *, struct buf *);
52*f603807bSTomohiro Kusumi int dm_target_mirror_deps(dm_table_entry_t *, prop_array_t);
53*f603807bSTomohiro Kusumi int dm_target_mirror_destroy(dm_table_entry_t *);
54*f603807bSTomohiro Kusumi 
55*f603807bSTomohiro Kusumi /*
56*f603807bSTomohiro Kusumi  * Init function called from dm_table_load_ioctl.
57*f603807bSTomohiro Kusumi  * start length mirror log_type #logargs logarg1 ... logargN #devs device1 offset1 ... deviceN offsetN
58*f603807bSTomohiro Kusumi  * 0 52428800 mirror clustered_disk 4 253:2 1024 UUID block_on_error 3 253:3 0 253:4 0 253:5 0
59*f603807bSTomohiro Kusumi  */
60*f603807bSTomohiro Kusumi int
dm_target_mirror_init(dm_table_entry_t * table_en,int argc,char ** argv)61*f603807bSTomohiro Kusumi dm_target_mirror_init(dm_table_entry_t *table_en, int argc, char **argv)
62*f603807bSTomohiro Kusumi {
63*f603807bSTomohiro Kusumi 
64*f603807bSTomohiro Kusumi 	kprintf("Mirror target init function called!!\n");
65*f603807bSTomohiro Kusumi 
66*f603807bSTomohiro Kusumi 	return ENOSYS;
67*f603807bSTomohiro Kusumi }
68*f603807bSTomohiro Kusumi 
69*f603807bSTomohiro Kusumi /* Table routine called to get params string. */
70*f603807bSTomohiro Kusumi char *
dm_target_mirror_table(void * target_config)71*f603807bSTomohiro Kusumi dm_target_mirror_table(void *target_config)
72*f603807bSTomohiro Kusumi {
73*f603807bSTomohiro Kusumi 	return NULL;
74*f603807bSTomohiro Kusumi }
75*f603807bSTomohiro Kusumi 
76*f603807bSTomohiro Kusumi /* Strategy routine called from dm_strategy. */
77*f603807bSTomohiro Kusumi int
dm_target_mirror_strategy(dm_table_entry_t * table_en,struct buf * bp)78*f603807bSTomohiro Kusumi dm_target_mirror_strategy(dm_table_entry_t *table_en, struct buf *bp)
79*f603807bSTomohiro Kusumi {
80*f603807bSTomohiro Kusumi 
81*f603807bSTomohiro Kusumi 	kprintf("Mirror target read function called!!\n");
82*f603807bSTomohiro Kusumi 
83*f603807bSTomohiro Kusumi 	bp->b_error = EIO;
84*f603807bSTomohiro Kusumi 	bp->b_resid = 0;
85*f603807bSTomohiro Kusumi 
86*f603807bSTomohiro Kusumi 	biodone(bp);
87*f603807bSTomohiro Kusumi 
88*f603807bSTomohiro Kusumi 	return 0;
89*f603807bSTomohiro Kusumi }
90*f603807bSTomohiro Kusumi 
91*f603807bSTomohiro Kusumi /* Doesn't do anything here. */
92*f603807bSTomohiro Kusumi int
dm_target_mirror_destroy(dm_table_entry_t * table_en)93*f603807bSTomohiro Kusumi dm_target_mirror_destroy(dm_table_entry_t *table_en)
94*f603807bSTomohiro Kusumi {
95*f603807bSTomohiro Kusumi 	/* Unbusy target so we can unload it */
96*f603807bSTomohiro Kusumi 	dm_target_unbusy(table_en->target);
97*f603807bSTomohiro Kusumi 
98*f603807bSTomohiro Kusumi 	return 0;
99*f603807bSTomohiro Kusumi }
100*f603807bSTomohiro Kusumi 
101*f603807bSTomohiro Kusumi /* Doesn't not need to do anything here. */
102*f603807bSTomohiro Kusumi int
dm_target_mirror_deps(dm_table_entry_t * table_en,prop_array_t prop_array)103*f603807bSTomohiro Kusumi dm_target_mirror_deps(dm_table_entry_t *table_en, prop_array_t prop_array)
104*f603807bSTomohiro Kusumi {
105*f603807bSTomohiro Kusumi 	return 0;
106*f603807bSTomohiro Kusumi }
107