1 /* $NetBSD: dm_target_linear.c,v 1.4 2009/03/01 23:17:39 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 onyl 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 /* Insert dmp to global pdev list */ 78 if ((dmp = dm_pdev_insert(argv[0])) == NULL) 79 return ENOENT; 80 81 aprint_debug("Linear target init function called %s--%s!!\n", 82 argv[0], argv[1]); 83 84 if ((tlc = kmem_alloc(sizeof(dm_target_linear_config_t), KM_NOSLEEP)) 85 == NULL) 86 return 1; 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 uint32_t i; 112 uint32_t count; 113 size_t prm_len; 114 115 tlc = target_config; 116 prm_len = 0; 117 count = 0; 118 119 /* count number of chars in offset */ 120 for(i = tlc->offset; i != 0; i /= 10) 121 count++; 122 123 aprint_debug("Linear target status function called\n"); 124 125 /* length of name + count of chars + one space and null char */ 126 prm_len = strlen(tlc->pdev->name) + count + 2; 127 128 if ((params = kmem_alloc(prm_len, KM_NOSLEEP)) == NULL) 129 return NULL; 130 131 aprint_debug("%s %"PRIu64, tlc->pdev->name, tlc->offset); 132 snprintf(params, prm_len,"%s %"PRIu64, tlc->pdev->name, tlc->offset); 133 134 return params; 135 } 136 137 /* 138 * Do IO operation, called from dmstrategy routine. 139 */ 140 int 141 dm_target_linear_strategy(dm_table_entry_t *table_en, struct buf *bp) 142 { 143 dm_target_linear_config_t *tlc; 144 145 tlc = table_en->target_config; 146 147 /* printf("Linear target read function called %" PRIu64 "!!\n", 148 tlc->offset);*/ 149 150 bp->b_blkno += tlc->offset; 151 152 VOP_STRATEGY(tlc->pdev->pdev_vnode, bp); 153 154 return 0; 155 156 } 157 158 /* 159 * Destroy target specific data. Decrement table pdevs. 160 */ 161 int 162 dm_target_linear_destroy(dm_table_entry_t *table_en) 163 { 164 dm_target_linear_config_t *tlc; 165 166 /* 167 * Destroy function is called for every target even if it 168 * doesn't have target_config. 169 */ 170 171 if (table_en->target_config == NULL) 172 return 0; 173 174 tlc = table_en->target_config; 175 176 /* Decrement pdev ref counter if 0 remove it */ 177 dm_pdev_decr(tlc->pdev); 178 179 /* Unbusy target so we can unload it */ 180 dm_target_unbusy(table_en->target); 181 182 kmem_free(table_en->target_config, sizeof(dm_target_linear_config_t)); 183 184 table_en->target_config = NULL; 185 186 return 0; 187 } 188 189 /* Add this target pdev dependiences to prop_array_t */ 190 int 191 dm_target_linear_deps(dm_table_entry_t *table_en, prop_array_t prop_array) 192 { 193 dm_target_linear_config_t *tlc; 194 struct vattr va; 195 196 int error; 197 198 if (table_en->target_config == NULL) 199 return ENOENT; 200 201 tlc = table_en->target_config; 202 203 if ((error = VOP_GETATTR(tlc->pdev->pdev_vnode, &va, curlwp->l_cred)) != 0) 204 return error; 205 206 prop_array_add_uint64(prop_array, (uint64_t)va.va_rdev); 207 208 return 0; 209 } 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 /* 223 * Transform char s to uint64_t offset number. 224 */ 225 uint64_t 226 atoi(const char *s) 227 { 228 uint64_t n; 229 n = 0; 230 231 while (*s != '\0') { 232 if (!isdigit(*s)) 233 break; 234 235 n = (10 * n) + (*s - '0'); 236 s++; 237 } 238 239 return n; 240 } 241