1 /*$NetBSD: dm_target_mirror.c,v 1.8 2010/01/04 00:12:22 haad Exp $*/ 2 3 /* 4 * Copyright (c) 2009 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 mirror target. 34 */ 35 #include <dev/disk/dm/dm.h> 36 37 typedef struct target_mirror_config { 38 #define MAX_MIRROR_COPIES 4 39 dm_pdev_t *orig; 40 dm_pdev_t *copies[MAX_MIRROR_COPIES]; 41 42 /* copied blocks bitmaps administration etc*/ 43 dm_pdev_t *log_pdev; /* for administration */ 44 uint64_t log_regionsize; /* blocksize of mirror */ 45 46 /* list of parts that still need copied etc.; run length encoded? */ 47 } dm_target_mirror_config_t; 48 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 *); 54 55 /* 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 59 */ 60 int 61 dm_target_mirror_init(dm_table_entry_t *table_en, int argc, char **argv) 62 { 63 64 kprintf("Mirror target init function called!!\n"); 65 66 return ENOSYS; 67 } 68 69 /* Table routine called to get params string. */ 70 char * 71 dm_target_mirror_table(void *target_config) 72 { 73 return NULL; 74 } 75 76 /* Strategy routine called from dm_strategy. */ 77 int 78 dm_target_mirror_strategy(dm_table_entry_t *table_en, struct buf *bp) 79 { 80 81 kprintf("Mirror target read function called!!\n"); 82 83 bp->b_error = EIO; 84 bp->b_resid = 0; 85 86 biodone(bp); 87 88 return 0; 89 } 90 91 /* Doesn't do anything here. */ 92 int 93 dm_target_mirror_destroy(dm_table_entry_t *table_en) 94 { 95 /* Unbusy target so we can unload it */ 96 dm_target_unbusy(table_en->target); 97 98 return 0; 99 } 100 101 /* Doesn't not need to do anything here. */ 102 int 103 dm_target_mirror_deps(dm_table_entry_t *table_en, prop_array_t prop_array) 104 { 105 return 0; 106 } 107