dm_target_linear.c revision 1.4.2.2
1 1.4.2.2 yamt /* $NetBSD: dm_target_linear.c,v 1.4.2.2 2009/05/04 08:12:36 yamt Exp $ */ 2 1.4.2.2 yamt 3 1.4.2.2 yamt /* 4 1.4.2.2 yamt * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 1.4.2.2 yamt * All rights reserved. 6 1.4.2.2 yamt * 7 1.4.2.2 yamt * This code is derived from software contributed to The NetBSD Foundation 8 1.4.2.2 yamt * by Adam Hamsik. 9 1.4.2.2 yamt * 10 1.4.2.2 yamt * Redistribution and use in source and binary forms, with or without 11 1.4.2.2 yamt * modification, are permitted provided that the following conditions 12 1.4.2.2 yamt * are met: 13 1.4.2.2 yamt * 1. Redistributions of source code must retain the above copyright 14 1.4.2.2 yamt * notice, this list of conditions and the following disclaimer. 15 1.4.2.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 16 1.4.2.2 yamt * notice, this list of conditions and the following disclaimer in the 17 1.4.2.2 yamt * documentation and/or other materials provided with the distribution. 18 1.4.2.2 yamt * 19 1.4.2.2 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.4.2.2 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.4.2.2 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.4.2.2 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.4.2.2 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.4.2.2 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.4.2.2 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.4.2.2 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.4.2.2 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.4.2.2 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.4.2.2 yamt * POSSIBILITY OF SUCH DAMAGE. 30 1.4.2.2 yamt */ 31 1.4.2.2 yamt 32 1.4.2.2 yamt 33 1.4.2.2 yamt /* 34 1.4.2.2 yamt * This file implements initial version of device-mapper dklinear target. 35 1.4.2.2 yamt */ 36 1.4.2.2 yamt 37 1.4.2.2 yamt #include <sys/types.h> 38 1.4.2.2 yamt #include <sys/param.h> 39 1.4.2.2 yamt 40 1.4.2.2 yamt #include <sys/buf.h> 41 1.4.2.2 yamt #include <sys/kmem.h> 42 1.4.2.2 yamt #include <sys/vnode.h> 43 1.4.2.2 yamt 44 1.4.2.2 yamt #include <machine/int_fmtio.h> 45 1.4.2.2 yamt 46 1.4.2.2 yamt #include "dm.h" 47 1.4.2.2 yamt 48 1.4.2.2 yamt /* 49 1.4.2.2 yamt * Allocate target specific config data, and link them to table. 50 1.4.2.2 yamt * This function is called only when, flags is not READONLY and 51 1.4.2.2 yamt * therefore we can add things to pdev list. This should not a 52 1.4.2.2 yamt * problem because this routine is called onyl from dm_table_load_ioctl. 53 1.4.2.2 yamt * @argv[0] is name, 54 1.4.2.2 yamt * @argv[1] is physical data offset. 55 1.4.2.2 yamt */ 56 1.4.2.2 yamt int 57 1.4.2.2 yamt dm_target_linear_init(dm_dev_t *dmv, void **target_config, char *params) 58 1.4.2.2 yamt { 59 1.4.2.2 yamt dm_target_linear_config_t *tlc; 60 1.4.2.2 yamt dm_pdev_t *dmp; 61 1.4.2.2 yamt 62 1.4.2.2 yamt char **ap, *argv[3]; 63 1.4.2.2 yamt 64 1.4.2.2 yamt if(params == NULL) 65 1.4.2.2 yamt return EINVAL; 66 1.4.2.2 yamt 67 1.4.2.2 yamt /* 68 1.4.2.2 yamt * Parse a string, containing tokens delimited by white space, 69 1.4.2.2 yamt * into an argument vector 70 1.4.2.2 yamt */ 71 1.4.2.2 yamt for (ap = argv; ap < &argv[2] && 72 1.4.2.2 yamt (*ap = strsep(¶ms, " \t")) != NULL;) { 73 1.4.2.2 yamt if (**ap != '\0') 74 1.4.2.2 yamt ap++; 75 1.4.2.2 yamt } 76 1.4.2.2 yamt 77 1.4.2.2 yamt /* Insert dmp to global pdev list */ 78 1.4.2.2 yamt if ((dmp = dm_pdev_insert(argv[0])) == NULL) 79 1.4.2.2 yamt return ENOENT; 80 1.4.2.2 yamt 81 1.4.2.2 yamt aprint_debug("Linear target init function called %s--%s!!\n", 82 1.4.2.2 yamt argv[0], argv[1]); 83 1.4.2.2 yamt 84 1.4.2.2 yamt if ((tlc = kmem_alloc(sizeof(dm_target_linear_config_t), KM_NOSLEEP)) 85 1.4.2.2 yamt == NULL) 86 1.4.2.2 yamt return 1; 87 1.4.2.2 yamt 88 1.4.2.2 yamt tlc->pdev = dmp; 89 1.4.2.2 yamt tlc->offset = 0; /* default settings */ 90 1.4.2.2 yamt 91 1.4.2.2 yamt /* Check user input if it is not leave offset as 0. */ 92 1.4.2.2 yamt tlc->offset = atoi(argv[1]); 93 1.4.2.2 yamt 94 1.4.2.2 yamt *target_config = tlc; 95 1.4.2.2 yamt 96 1.4.2.2 yamt dmv->dev_type = DM_LINEAR_DEV; 97 1.4.2.2 yamt 98 1.4.2.2 yamt return 0; 99 1.4.2.2 yamt } 100 1.4.2.2 yamt 101 1.4.2.2 yamt /* 102 1.4.2.2 yamt * Status routine is called to get params string, which is target 103 1.4.2.2 yamt * specific. When dm_table_status_ioctl is called with flag 104 1.4.2.2 yamt * DM_STATUS_TABLE_FLAG I have to sent params string back. 105 1.4.2.2 yamt */ 106 1.4.2.2 yamt char * 107 1.4.2.2 yamt dm_target_linear_status(void *target_config) 108 1.4.2.2 yamt { 109 1.4.2.2 yamt dm_target_linear_config_t *tlc; 110 1.4.2.2 yamt char *params; 111 1.4.2.2 yamt uint32_t i; 112 1.4.2.2 yamt uint32_t count; 113 1.4.2.2 yamt size_t prm_len; 114 1.4.2.2 yamt 115 1.4.2.2 yamt tlc = target_config; 116 1.4.2.2 yamt prm_len = 0; 117 1.4.2.2 yamt count = 0; 118 1.4.2.2 yamt 119 1.4.2.2 yamt /* count number of chars in offset */ 120 1.4.2.2 yamt for(i = tlc->offset; i != 0; i /= 10) 121 1.4.2.2 yamt count++; 122 1.4.2.2 yamt 123 1.4.2.2 yamt aprint_debug("Linear target status function called\n"); 124 1.4.2.2 yamt 125 1.4.2.2 yamt /* length of name + count of chars + one space and null char */ 126 1.4.2.2 yamt prm_len = strlen(tlc->pdev->name) + count + 2; 127 1.4.2.2 yamt 128 1.4.2.2 yamt if ((params = kmem_alloc(prm_len, KM_NOSLEEP)) == NULL) 129 1.4.2.2 yamt return NULL; 130 1.4.2.2 yamt 131 1.4.2.2 yamt aprint_debug("%s %"PRIu64, tlc->pdev->name, tlc->offset); 132 1.4.2.2 yamt snprintf(params, prm_len,"%s %"PRIu64, tlc->pdev->name, tlc->offset); 133 1.4.2.2 yamt 134 1.4.2.2 yamt return params; 135 1.4.2.2 yamt } 136 1.4.2.2 yamt 137 1.4.2.2 yamt /* 138 1.4.2.2 yamt * Do IO operation, called from dmstrategy routine. 139 1.4.2.2 yamt */ 140 1.4.2.2 yamt int 141 1.4.2.2 yamt dm_target_linear_strategy(dm_table_entry_t *table_en, struct buf *bp) 142 1.4.2.2 yamt { 143 1.4.2.2 yamt dm_target_linear_config_t *tlc; 144 1.4.2.2 yamt 145 1.4.2.2 yamt tlc = table_en->target_config; 146 1.4.2.2 yamt 147 1.4.2.2 yamt /* printf("Linear target read function called %" PRIu64 "!!\n", 148 1.4.2.2 yamt tlc->offset);*/ 149 1.4.2.2 yamt 150 1.4.2.2 yamt bp->b_blkno += tlc->offset; 151 1.4.2.2 yamt 152 1.4.2.2 yamt VOP_STRATEGY(tlc->pdev->pdev_vnode, bp); 153 1.4.2.2 yamt 154 1.4.2.2 yamt return 0; 155 1.4.2.2 yamt 156 1.4.2.2 yamt } 157 1.4.2.2 yamt 158 1.4.2.2 yamt /* 159 1.4.2.2 yamt * Destroy target specific data. Decrement table pdevs. 160 1.4.2.2 yamt */ 161 1.4.2.2 yamt int 162 1.4.2.2 yamt dm_target_linear_destroy(dm_table_entry_t *table_en) 163 1.4.2.2 yamt { 164 1.4.2.2 yamt dm_target_linear_config_t *tlc; 165 1.4.2.2 yamt 166 1.4.2.2 yamt /* 167 1.4.2.2 yamt * Destroy function is called for every target even if it 168 1.4.2.2 yamt * doesn't have target_config. 169 1.4.2.2 yamt */ 170 1.4.2.2 yamt 171 1.4.2.2 yamt if (table_en->target_config == NULL) 172 1.4.2.2 yamt return 0; 173 1.4.2.2 yamt 174 1.4.2.2 yamt tlc = table_en->target_config; 175 1.4.2.2 yamt 176 1.4.2.2 yamt /* Decrement pdev ref counter if 0 remove it */ 177 1.4.2.2 yamt dm_pdev_decr(tlc->pdev); 178 1.4.2.2 yamt 179 1.4.2.2 yamt /* Unbusy target so we can unload it */ 180 1.4.2.2 yamt dm_target_unbusy(table_en->target); 181 1.4.2.2 yamt 182 1.4.2.2 yamt kmem_free(table_en->target_config, sizeof(dm_target_linear_config_t)); 183 1.4.2.2 yamt 184 1.4.2.2 yamt table_en->target_config = NULL; 185 1.4.2.2 yamt 186 1.4.2.2 yamt return 0; 187 1.4.2.2 yamt } 188 1.4.2.2 yamt 189 1.4.2.2 yamt /* Add this target pdev dependiences to prop_array_t */ 190 1.4.2.2 yamt int 191 1.4.2.2 yamt dm_target_linear_deps(dm_table_entry_t *table_en, prop_array_t prop_array) 192 1.4.2.2 yamt { 193 1.4.2.2 yamt dm_target_linear_config_t *tlc; 194 1.4.2.2 yamt struct vattr va; 195 1.4.2.2 yamt 196 1.4.2.2 yamt int error; 197 1.4.2.2 yamt 198 1.4.2.2 yamt if (table_en->target_config == NULL) 199 1.4.2.2 yamt return ENOENT; 200 1.4.2.2 yamt 201 1.4.2.2 yamt tlc = table_en->target_config; 202 1.4.2.2 yamt 203 1.4.2.2 yamt if ((error = VOP_GETATTR(tlc->pdev->pdev_vnode, &va, curlwp->l_cred)) != 0) 204 1.4.2.2 yamt return error; 205 1.4.2.2 yamt 206 1.4.2.2 yamt prop_array_add_uint64(prop_array, (uint64_t)va.va_rdev); 207 1.4.2.2 yamt 208 1.4.2.2 yamt return 0; 209 1.4.2.2 yamt } 210 1.4.2.2 yamt 211 1.4.2.2 yamt /* 212 1.4.2.2 yamt * Register upcall device. 213 1.4.2.2 yamt * Linear target doesn't need any upcall devices but other targets like 214 1.4.2.2 yamt * mirror, snapshot, multipath, stripe will use this functionality. 215 1.4.2.2 yamt */ 216 1.4.2.2 yamt int 217 1.4.2.2 yamt dm_target_linear_upcall(dm_table_entry_t *table_en, struct buf *bp) 218 1.4.2.2 yamt { 219 1.4.2.2 yamt return 0; 220 1.4.2.2 yamt } 221 1.4.2.2 yamt 222 1.4.2.2 yamt /* 223 1.4.2.2 yamt * Transform char s to uint64_t offset number. 224 1.4.2.2 yamt */ 225 1.4.2.2 yamt uint64_t 226 1.4.2.2 yamt atoi(const char *s) 227 1.4.2.2 yamt { 228 1.4.2.2 yamt uint64_t n; 229 1.4.2.2 yamt n = 0; 230 1.4.2.2 yamt 231 1.4.2.2 yamt while (*s != '\0') { 232 1.4.2.2 yamt if (!isdigit(*s)) 233 1.4.2.2 yamt break; 234 1.4.2.2 yamt 235 1.4.2.2 yamt n = (10 * n) + (*s - '0'); 236 1.4.2.2 yamt s++; 237 1.4.2.2 yamt } 238 1.4.2.2 yamt 239 1.4.2.2 yamt return n; 240 1.4.2.2 yamt } 241
Indexes created Tue Sep 30 20:09:53 GMT 2025