1 /*$NetBSD: dm_target_mirror.c,v 1.8 2010/01/04 00:12:22 haad Exp $*/
4 * Copyright (c) 2009 The NetBSD Foundation, Inc.
7 * This code is derived from software contributed to The NetBSD Foundation
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11 * modification, are permitted provided that the following conditions
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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
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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
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26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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33 * This file implements initial version of device-mapper mirror target.
35 #include <dev/disk/dm/dm.h>
37 typedef struct target_mirror_config {
38 #define MAX_MIRROR_COPIES 4
40 dm_pdev_t *copies[MAX_MIRROR_COPIES];
42 /* copied blocks bitmaps administration etc*/
43 dm_pdev_t *log_pdev; /* for administration */
44 uint64_t log_regionsize; /* blocksize of mirror */
46 /* list of parts that still need copied etc.; run length encoded? */
47 } dm_target_mirror_config_t;
49 int dm_target_mirror_init(dm_table_entry_t *, int, char **);
50 char *dm_target_mirror_table(void *);
51 int dm_target_mirror_strategy(dm_table_entry_t *, struct buf *);
52 int dm_target_mirror_deps(dm_table_entry_t *, prop_array_t);
53 int dm_target_mirror_destroy(dm_table_entry_t *);
56 * Init function called from dm_table_load_ioctl.
57 * start length mirror log_type #logargs logarg1 ... logargN #devs device1 offset1 ... deviceN offsetN
58 * 0 52428800 mirror clustered_disk 4 253:2 1024 UUID block_on_error 3 253:3 0 253:4 0 253:5 0
61 dm_target_mirror_init(dm_table_entry_t *table_en, int argc, char **argv)
64 kprintf("Mirror target init function called!!\n");
66 dm_table_init_target(table_en, DM_MIRROR_DEV, NULL);
71 /* Table routine called to get params string. */
73 dm_target_mirror_table(void *target_config)
78 /* Strategy routine called from dm_strategy. */
80 dm_target_mirror_strategy(dm_table_entry_t *table_en, struct buf *bp)
83 kprintf("Mirror target read function called!!\n");
93 /* Doesn't do anything here. */
95 dm_target_mirror_destroy(dm_table_entry_t *table_en)
97 /* Unbusy target so we can unload it */
98 dm_target_unbusy(table_en->target);
103 /* Doesn't not need to do anything here. */
105 dm_target_mirror_deps(dm_table_entry_t *table_en, prop_array_t prop_array)