1 /* $NetBSD: dm_target_linear.c,v 1.8 2009/12/01 23:12:10 haad Exp $ */ 2 3 /* 4 * Copyright (c) 2008 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 /* 34 * This file implements initial version of device-mapper dklinear target. 35 */ 36 37 #include <sys/types.h> 38 #include <sys/param.h> 39 40 #include <sys/buf.h> 41 #include <sys/kmem.h> 42 #include <sys/vnode.h> 43 44 #include <machine/int_fmtio.h> 45 46 #include "dm.h" 47 48 /* 49 * Allocate target specific config data, and link them to table. 50 * This function is called only when, flags is not READONLY and 51 * therefore we can add things to pdev list. This should not a 52 * problem because this routine is called only from dm_table_load_ioctl. 53 * @argv[0] is name, 54 * @argv[1] is physical data offset. 55 */ 56 int 57 dm_target_linear_init(dm_dev_t *dmv, void **target_config, char *params) 58 { 59 dm_target_linear_config_t *tlc; 60 dm_pdev_t *dmp; 61 62 char **ap, *argv[3]; 63 64 if(params == NULL) 65 return EINVAL; 66 67 /* 68 * Parse a string, containing tokens delimited by white space, 69 * into an argument vector 70 */ 71 for (ap = argv; ap < &argv[2] && 72 (*ap = strsep(¶ms, " \t")) != NULL;) { 73 if (**ap != '\0') 74 ap++; 75 } 76 77 aprint_debug("Linear target init function called %s--%s!!\n", 78 argv[0], argv[1]); 79 80 /* Insert dmp to global pdev list */ 81 if ((dmp = dm_pdev_insert(argv[0])) == NULL) 82 return ENOENT; 83 84 if ((tlc = kmem_alloc(sizeof(dm_target_linear_config_t), KM_SLEEP)) 85 == NULL) 86 return ENOMEM; 87 88 tlc->pdev = dmp; 89 tlc->offset = 0; /* default settings */ 90 91 /* Check user input if it is not leave offset as 0. */ 92 tlc->offset = atoi(argv[1]); 93 94 *target_config = tlc; 95 96 dmv->dev_type = DM_LINEAR_DEV; 97 98 return 0; 99 } 100 101 /* 102 * Status routine is called to get params string, which is target 103 * specific. When dm_table_status_ioctl is called with flag 104 * DM_STATUS_TABLE_FLAG I have to sent params string back. 105 */ 106 char * 107 dm_target_linear_status(void *target_config) 108 { 109 dm_target_linear_config_t *tlc; 110 char *params; 111 tlc = target_config; 112 113 aprint_debug("Linear target status function called\n"); 114 115 if ((params = kmem_alloc(DM_MAX_PARAMS_SIZE, KM_NOSLEEP)) == NULL) 116 return NULL; 117 118 aprint_normal("%s %"PRIu64, tlc->pdev->name, tlc->offset); 119 snprintf(params, DM_MAX_PARAMS_SIZE,"%s %"PRIu64, 120 tlc->pdev->name, tlc->offset); 121 122 return params; 123 } 124 125 /* 126 * Do IO operation, called from dmstrategy routine. 127 */ 128 int 129 dm_target_linear_strategy(dm_table_entry_t *table_en, struct buf *bp) 130 { 131 dm_target_linear_config_t *tlc; 132 133 tlc = table_en->target_config; 134 135 /* printf("Linear target read function called %" PRIu64 "!!\n", 136 tlc->offset);*/ 137 138 bp->b_blkno += tlc->offset; 139 140 VOP_STRATEGY(tlc->pdev->pdev_vnode, bp); 141 142 return 0; 143 144 } 145 146 /* 147 * Destroy target specific data. Decrement table pdevs. 148 */ 149 int 150 dm_target_linear_destroy(dm_table_entry_t *table_en) 151 { 152 dm_target_linear_config_t *tlc; 153 154 /* 155 * Destroy function is called for every target even if it 156 * doesn't have target_config. 157 */ 158 159 if (table_en->target_config == NULL) 160 return 0; 161 162 tlc = table_en->target_config; 163 164 /* Decrement pdev ref counter if 0 remove it */ 165 dm_pdev_decr(tlc->pdev); 166 167 /* Unbusy target so we can unload it */ 168 dm_target_unbusy(table_en->target); 169 170 kmem_free(table_en->target_config, sizeof(dm_target_linear_config_t)); 171 172 table_en->target_config = NULL; 173 174 return 0; 175 } 176 177 /* Add this target pdev dependiences to prop_array_t */ 178 int 179 dm_target_linear_deps(dm_table_entry_t *table_en, prop_array_t prop_array) 180 { 181 dm_target_linear_config_t *tlc; 182 struct vattr va; 183 184 int error; 185 186 if (table_en->target_config == NULL) 187 return ENOENT; 188 189 tlc = table_en->target_config; 190 191 if ((error = VOP_GETATTR(tlc->pdev->pdev_vnode, &va, curlwp->l_cred)) != 0) 192 return error; 193 194 prop_array_add_uint64(prop_array, (uint64_t)va.va_rdev); 195 196 return 0; 197 } 198 199 /* 200 * Register upcall device. 201 * Linear target doesn't need any upcall devices but other targets like 202 * mirror, snapshot, multipath, stripe will use this functionality. 203 */ 204 int 205 dm_target_linear_upcall(dm_table_entry_t *table_en, struct buf *bp) 206 { 207 return 0; 208 } 209 210 /* 211 * Transform char s to uint64_t offset number. 212 */ 213 uint64_t 214 atoi(const char *s) 215 { 216 uint64_t n; 217 n = 0; 218 219 while (*s != '\0') { 220 if (!isdigit(*s)) 221 break; 222 223 n = (10 * n) + (*s - '0'); 224 s++; 225 } 226 227 return n; 228 } 229