1 /* $NetBSD: dm_target_linear.c,v 1.12 2010/12/23 14:58:13 mlelstv 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 #include <sys/lwp.h> 44 45 #include <machine/int_fmtio.h> 46 47 #include "dm.h" 48 49 /* 50 * Allocate target specific config data, and link them to table. 51 * This function is called only when, flags is not READONLY and 52 * therefore we can add things to pdev list. This should not a 53 * problem because this routine is called only from dm_table_load_ioctl. 54 * @argv[0] is name, 55 * @argv[1] is physical data offset. 56 */ 57 int 58 dm_target_linear_init(dm_dev_t * dmv, void **target_config, char *params) 59 { 60 dm_target_linear_config_t *tlc; 61 dm_pdev_t *dmp; 62 63 char **ap, *argv[3]; 64 65 if (params == NULL) 66 return EINVAL; 67 68 /* 69 * Parse a string, containing tokens delimited by white space, 70 * into an argument vector 71 */ 72 for (ap = argv; ap < &argv[2] && 73 (*ap = strsep(¶ms, " \t")) != NULL;) { 74 if (**ap != '\0') 75 ap++; 76 } 77 78 aprint_debug("Linear target init function called %s--%s!!\n", 79 argv[0], argv[1]); 80 81 /* Insert dmp to global pdev list */ 82 if ((dmp = dm_pdev_insert(argv[0])) == NULL) 83 return ENOENT; 84 85 if ((tlc = kmem_alloc(sizeof(dm_target_linear_config_t), KM_SLEEP)) 86 == NULL) 87 return ENOMEM; 88 89 tlc->pdev = dmp; 90 tlc->offset = 0; /* default settings */ 91 92 /* Check user input if it is not leave offset as 0. */ 93 tlc->offset = atoi(argv[1]); 94 95 *target_config = tlc; 96 97 dmv->dev_type = DM_LINEAR_DEV; 98 99 return 0; 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 * Do IO operation, called from dmstrategy routine. 126 */ 127 int 128 dm_target_linear_strategy(dm_table_entry_t * table_en, struct buf * bp) 129 { 130 dm_target_linear_config_t *tlc; 131 132 tlc = table_en->target_config; 133 134 /* printf("Linear target read function called %" PRIu64 "!!\n", 135 tlc->offset);*/ 136 137 bp->b_blkno += tlc->offset; 138 139 VOP_STRATEGY(tlc->pdev->pdev_vnode, bp); 140 141 return 0; 142 143 } 144 /* 145 * Sync underlying disk caches. 146 */ 147 int 148 dm_target_linear_sync(dm_table_entry_t * table_en) 149 { 150 int cmd; 151 dm_target_linear_config_t *tlc; 152 153 tlc = table_en->target_config; 154 155 cmd = 1; 156 157 return VOP_IOCTL(tlc->pdev->pdev_vnode, DIOCCACHESYNC, &cmd, 158 FREAD|FWRITE, kauth_cred_get()); 159 } 160 /* 161 * Destroy target specific data. Decrement table pdevs. 162 */ 163 int 164 dm_target_linear_destroy(dm_table_entry_t * table_en) 165 { 166 dm_target_linear_config_t *tlc; 167 168 /* 169 * Destroy function is called for every target even if it 170 * doesn't have target_config. 171 */ 172 173 if (table_en->target_config == NULL) 174 return 0; 175 176 tlc = table_en->target_config; 177 178 /* Decrement pdev ref counter if 0 remove it */ 179 dm_pdev_decr(tlc->pdev); 180 181 /* Unbusy target so we can unload it */ 182 dm_target_unbusy(table_en->target); 183 184 kmem_free(table_en->target_config, sizeof(dm_target_linear_config_t)); 185 186 table_en->target_config = NULL; 187 188 return 0; 189 } 190 /* Add this target pdev dependiences to prop_array_t */ 191 int 192 dm_target_linear_deps(dm_table_entry_t * table_en, prop_array_t prop_array) 193 { 194 dm_target_linear_config_t *tlc; 195 struct vattr va; 196 197 int error; 198 199 if (table_en->target_config == NULL) 200 return ENOENT; 201 202 tlc = table_en->target_config; 203 204 if ((error = VOP_GETATTR(tlc->pdev->pdev_vnode, &va, curlwp->l_cred)) != 0) 205 return error; 206 207 prop_array_add_uint64(prop_array, (uint64_t) va.va_rdev); 208 209 return 0; 210 } 211 /* 212 * Register upcall device. 213 * Linear target doesn't need any upcall devices but other targets like 214 * mirror, snapshot, multipath, stripe will use this functionality. 215 */ 216 int 217 dm_target_linear_upcall(dm_table_entry_t * table_en, struct buf * bp) 218 { 219 return 0; 220 } 221 /* 222 * Query physical block size of this target 223 * For a linear target this is just the sector size of the underlying device 224 */ 225 int 226 dm_target_linear_secsize(dm_table_entry_t * table_en, unsigned *secsizep) 227 { 228 dm_target_linear_config_t *tlc; 229 unsigned secsize; 230 231 secsize = 0; 232 233 tlc = table_en->target_config; 234 if (tlc != NULL) 235 secsize = tlc->pdev->pdev_secsize; 236 237 *secsizep = secsize; 238 239 return 0; 240 } 241 /* 242 * Transform char s to uint64_t offset number. 243 */ 244 uint64_t 245 atoi(const char *s) 246 { 247 uint64_t n; 248 n = 0; 249 250 while (*s != '\0') { 251 if (!isdigit(*s)) 252 break; 253 254 n = (10 * n) + (*s - '0'); 255 s++; 256 } 257 258 return n; 259 } 260