1 /* $NetBSD: dm_target_linear.c,v 1.16 2017/06/04 08:54:38 mbalmer 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 tlc = kmem_alloc(sizeof(dm_target_linear_config_t), KM_SLEEP); 86 tlc->pdev = dmp; 87 tlc->offset = 0; /* default settings */ 88 89 /* Check user input if it is not leave offset as 0. */ 90 tlc->offset = atoi(argv[1]); 91 92 *target_config = tlc; 93 94 dmv->dev_type = DM_LINEAR_DEV; 95 96 return 0; 97 } 98 /* 99 * Status routine is called to get params string, which is target 100 * specific. When dm_table_status_ioctl is called with flag 101 * DM_STATUS_TABLE_FLAG I have to sent params string back. 102 */ 103 char * 104 dm_target_linear_status(void *target_config) 105 { 106 dm_target_linear_config_t *tlc; 107 char *params; 108 tlc = target_config; 109 110 aprint_debug("Linear target status function called\n"); 111 112 if ((params = kmem_alloc(DM_MAX_PARAMS_SIZE, KM_NOSLEEP)) == NULL) 113 return NULL; 114 115 aprint_normal("%s %" PRIu64, tlc->pdev->name, tlc->offset); 116 snprintf(params, DM_MAX_PARAMS_SIZE, "%s %" PRIu64, 117 tlc->pdev->name, tlc->offset); 118 119 return params; 120 } 121 /* 122 * Do IO operation, called from dmstrategy routine. 123 */ 124 int 125 dm_target_linear_strategy(dm_table_entry_t * table_en, struct buf * bp) 126 { 127 dm_target_linear_config_t *tlc; 128 129 tlc = table_en->target_config; 130 131 /* printf("Linear target read function called %" PRIu64 "!!\n", 132 tlc->offset);*/ 133 134 bp->b_blkno += tlc->offset; 135 136 VOP_STRATEGY(tlc->pdev->pdev_vnode, bp); 137 138 return 0; 139 140 } 141 /* 142 * Sync underlying disk caches. 143 */ 144 int 145 dm_target_linear_sync(dm_table_entry_t * table_en) 146 { 147 int cmd; 148 dm_target_linear_config_t *tlc; 149 150 tlc = table_en->target_config; 151 152 cmd = 1; 153 154 return VOP_IOCTL(tlc->pdev->pdev_vnode, DIOCCACHESYNC, &cmd, 155 FREAD|FWRITE, kauth_cred_get()); 156 } 157 /* 158 * Destroy target specific data. Decrement table pdevs. 159 */ 160 int 161 dm_target_linear_destroy(dm_table_entry_t * table_en) 162 { 163 dm_target_linear_config_t *tlc; 164 165 /* 166 * Destroy function is called for every target even if it 167 * doesn't have target_config. 168 */ 169 170 if (table_en->target_config == NULL) 171 return 0; 172 173 tlc = table_en->target_config; 174 175 /* Decrement pdev ref counter if 0 remove it */ 176 dm_pdev_decr(tlc->pdev); 177 178 /* Unbusy target so we can unload it */ 179 dm_target_unbusy(table_en->target); 180 181 kmem_free(table_en->target_config, sizeof(dm_target_linear_config_t)); 182 183 table_en->target_config = NULL; 184 185 return 0; 186 } 187 /* Add this target pdev dependencies to prop_array_t */ 188 int 189 dm_target_linear_deps(dm_table_entry_t * table_en, prop_array_t prop_array) 190 { 191 dm_target_linear_config_t *tlc; 192 193 if (table_en->target_config == NULL) 194 return ENOENT; 195 196 tlc = table_en->target_config; 197 198 prop_array_add_uint64(prop_array, 199 (uint64_t) tlc->pdev->pdev_vnode->v_rdev); 200 201 return 0; 202 } 203 /* 204 * Register upcall device. 205 * Linear target doesn't need any upcall devices but other targets like 206 * mirror, snapshot, multipath, stripe will use this functionality. 207 */ 208 int 209 dm_target_linear_upcall(dm_table_entry_t * table_en, struct buf * bp) 210 { 211 return 0; 212 } 213 /* 214 * Query physical block size of this target 215 * For a linear target this is just the sector size of the underlying device 216 */ 217 int 218 dm_target_linear_secsize(dm_table_entry_t * table_en, unsigned *secsizep) 219 { 220 dm_target_linear_config_t *tlc; 221 unsigned secsize; 222 223 secsize = 0; 224 225 tlc = table_en->target_config; 226 if (tlc != NULL) 227 secsize = tlc->pdev->pdev_secsize; 228 229 *secsizep = secsize; 230 231 return 0; 232 } 233 /* 234 * Transform char s to uint64_t offset number. 235 */ 236 uint64_t 237 atoi(const char *s) 238 { 239 uint64_t n; 240 n = 0; 241 242 while (*s != '\0') { 243 if (!isdigit(*s)) 244 break; 245 246 n = (10 * n) + (*s - '0'); 247 s++; 248 } 249 250 return n; 251 } 252