dm_target_stripe.c revision 1.5.2.2
1 1.5.2.2 yamt /*$NetBSD: dm_target_stripe.c,v 1.5.2.2 2009/05/04 08:12:37 yamt Exp $*/ 2 1.5.2.2 yamt 3 1.5.2.2 yamt /* 4 1.5.2.2 yamt * Copyright (c) 2009 The NetBSD Foundation, Inc. 5 1.5.2.2 yamt * All rights reserved. 6 1.5.2.2 yamt * 7 1.5.2.2 yamt * This code is derived from software contributed to The NetBSD Foundation 8 1.5.2.2 yamt * by Adam Hamsik. 9 1.5.2.2 yamt * 10 1.5.2.2 yamt * Redistribution and use in source and binary forms, with or without 11 1.5.2.2 yamt * modification, are permitted provided that the following conditions 12 1.5.2.2 yamt * are met: 13 1.5.2.2 yamt * 1. Redistributions of source code must retain the above copyright 14 1.5.2.2 yamt * notice, this list of conditions and the following disclaimer. 15 1.5.2.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 16 1.5.2.2 yamt * notice, this list of conditions and the following disclaimer in the 17 1.5.2.2 yamt * documentation and/or other materials provided with the distribution. 18 1.5.2.2 yamt * 19 1.5.2.2 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.5.2.2 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.5.2.2 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.5.2.2 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.5.2.2 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.5.2.2 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.5.2.2 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.5.2.2 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.5.2.2 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.5.2.2 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.5.2.2 yamt * POSSIBILITY OF SUCH DAMAGE. 30 1.5.2.2 yamt */ 31 1.5.2.2 yamt 32 1.5.2.2 yamt /* 33 1.5.2.2 yamt * This file implements initial version of device-mapper stripe target. 34 1.5.2.2 yamt */ 35 1.5.2.2 yamt #include <sys/types.h> 36 1.5.2.2 yamt #include <sys/param.h> 37 1.5.2.2 yamt 38 1.5.2.2 yamt #include <sys/buf.h> 39 1.5.2.2 yamt #include <sys/kmem.h> 40 1.5.2.2 yamt #include <sys/vnode.h> 41 1.5.2.2 yamt 42 1.5.2.2 yamt #include "dm.h" 43 1.5.2.2 yamt 44 1.5.2.2 yamt #ifdef DM_TARGET_MODULE 45 1.5.2.2 yamt /* 46 1.5.2.2 yamt * Every target can be compiled directly to dm driver or as a 47 1.5.2.2 yamt * separate module this part of target is used for loading targets 48 1.5.2.2 yamt * to dm driver. 49 1.5.2.2 yamt * Target can be unloaded from kernel only if there are no users of 50 1.5.2.2 yamt * it e.g. there are no devices which uses that target. 51 1.5.2.2 yamt */ 52 1.5.2.2 yamt #include <sys/kernel.h> 53 1.5.2.2 yamt #include <sys/module.h> 54 1.5.2.2 yamt 55 1.5.2.2 yamt MODULE(MODULE_CLASS_MISC, dm_target_stripe, NULL); 56 1.5.2.2 yamt 57 1.5.2.2 yamt static int 58 1.5.2.2 yamt dm_target_stripe_modcmd(modcmd_t cmd, void *arg) 59 1.5.2.2 yamt { 60 1.5.2.2 yamt dm_target_t *dmt; 61 1.5.2.2 yamt int r; 62 1.5.2.2 yamt dmt = NULL; 63 1.5.2.2 yamt 64 1.5.2.2 yamt switch (cmd) { 65 1.5.2.2 yamt case MODULE_CMD_INIT: 66 1.5.2.2 yamt if ((dmt = dm_target_lookup("stripe")) != NULL) { 67 1.5.2.2 yamt dm_target_unbusy(dmt); 68 1.5.2.2 yamt return EEXIST; 69 1.5.2.2 yamt } 70 1.5.2.2 yamt 71 1.5.2.2 yamt dmt = dm_target_alloc("stripe"); 72 1.5.2.2 yamt 73 1.5.2.2 yamt dmt->version[0] = 1; 74 1.5.2.2 yamt dmt->version[1] = 0; 75 1.5.2.2 yamt dmt->version[2] = 0; 76 1.5.2.2 yamt strlcpy(dmt->name, "stripe", DM_MAX_TYPE_NAME); 77 1.5.2.2 yamt dmt->init = &dm_target_stripe_init; 78 1.5.2.2 yamt dmt->status = &dm_target_stripe_status; 79 1.5.2.2 yamt dmt->strategy = &dm_target_stripe_strategy; 80 1.5.2.2 yamt dmt->deps = &dm_target_stripe_deps; 81 1.5.2.2 yamt dmt->destroy = &dm_target_stripe_destroy; 82 1.5.2.2 yamt dmt->upcall = &dm_target_stripe_upcall; 83 1.5.2.2 yamt 84 1.5.2.2 yamt r = dm_target_insert(dmt); 85 1.5.2.2 yamt 86 1.5.2.2 yamt break; 87 1.5.2.2 yamt 88 1.5.2.2 yamt case MODULE_CMD_FINI: 89 1.5.2.2 yamt r = dm_target_rem("stripe"); 90 1.5.2.2 yamt break; 91 1.5.2.2 yamt 92 1.5.2.2 yamt case MODULE_CMD_STAT: 93 1.5.2.2 yamt return ENOTTY; 94 1.5.2.2 yamt 95 1.5.2.2 yamt default: 96 1.5.2.2 yamt return ENOTTY; 97 1.5.2.2 yamt } 98 1.5.2.2 yamt 99 1.5.2.2 yamt return r; 100 1.5.2.2 yamt } 101 1.5.2.2 yamt 102 1.5.2.2 yamt #endif 103 1.5.2.2 yamt 104 1.5.2.2 yamt /* 105 1.5.2.2 yamt * Init function called from dm_table_load_ioctl. 106 1.5.2.2 yamt * Example line sent to dm from lvm tools when using striped target. 107 1.5.2.2 yamt * start length striped #stripes chunk_size device1 offset1 ... deviceN offsetN 108 1.5.2.2 yamt * 0 65536 striped 2 512 /dev/hda 0 /dev/hdb 0 109 1.5.2.2 yamt */ 110 1.5.2.2 yamt int 111 1.5.2.2 yamt dm_target_stripe_init(dm_dev_t *dmv, void **target_config, char *params) 112 1.5.2.2 yamt { 113 1.5.2.2 yamt dm_target_stripe_config_t *tsc; 114 1.5.2.2 yamt size_t len; 115 1.5.2.2 yamt char **ap, *argv[10]; 116 1.5.2.2 yamt 117 1.5.2.2 yamt if(params == NULL) 118 1.5.2.2 yamt return EINVAL; 119 1.5.2.2 yamt 120 1.5.2.2 yamt len = strlen(params) + 1; 121 1.5.2.2 yamt 122 1.5.2.2 yamt /* 123 1.5.2.2 yamt * Parse a string, containing tokens delimited by white space, 124 1.5.2.2 yamt * into an argument vector 125 1.5.2.2 yamt */ 126 1.5.2.2 yamt for (ap = argv; ap < &argv[9] && 127 1.5.2.2 yamt (*ap = strsep(¶ms, " \t")) != NULL;) { 128 1.5.2.2 yamt if (**ap != '\0') 129 1.5.2.2 yamt ap++; 130 1.5.2.2 yamt } 131 1.5.2.2 yamt 132 1.5.2.2 yamt printf("Stripe target init function called!!\n"); 133 1.5.2.2 yamt 134 1.5.2.2 yamt printf("Stripe target chunk size %s number of stripes %s\n", argv[1], argv[0]); 135 1.5.2.2 yamt printf("Stripe target device name %s -- offset %s\n", argv[2], argv[3]); 136 1.5.2.2 yamt printf("Stripe target device name %s -- offset %s\n", argv[4], argv[5]); 137 1.5.2.2 yamt 138 1.5.2.2 yamt if (atoi(argv[0]) > MAX_STRIPES) 139 1.5.2.2 yamt return ENOTSUP; 140 1.5.2.2 yamt 141 1.5.2.2 yamt if ((tsc = kmem_alloc(sizeof(dm_target_stripe_config_t), KM_NOSLEEP)) 142 1.5.2.2 yamt == NULL) 143 1.5.2.2 yamt return ENOMEM; 144 1.5.2.2 yamt 145 1.5.2.2 yamt /* Insert dmp to global pdev list */ 146 1.5.2.2 yamt if ((tsc->stripe_devs[0].pdev = dm_pdev_insert(argv[2])) == NULL) 147 1.5.2.2 yamt return ENOENT; 148 1.5.2.2 yamt 149 1.5.2.2 yamt /* Insert dmp to global pdev list */ 150 1.5.2.2 yamt if ((tsc->stripe_devs[1].pdev = dm_pdev_insert(argv[4])) == NULL) 151 1.5.2.2 yamt return ENOENT; 152 1.5.2.2 yamt 153 1.5.2.2 yamt tsc->stripe_devs[0].offset = atoi(argv[3]); 154 1.5.2.2 yamt tsc->stripe_devs[1].offset = atoi(argv[5]); 155 1.5.2.2 yamt 156 1.5.2.2 yamt /* Save length of param string */ 157 1.5.2.2 yamt tsc->params_len = len; 158 1.5.2.2 yamt tsc->stripe_chunksize = atoi(argv[1]); 159 1.5.2.2 yamt tsc->stripe_num = (uint8_t)atoi(argv[0]); 160 1.5.2.2 yamt 161 1.5.2.2 yamt *target_config = tsc; 162 1.5.2.2 yamt 163 1.5.2.2 yamt dmv->dev_type = DM_STRIPE_DEV; 164 1.5.2.2 yamt 165 1.5.2.2 yamt return 0; 166 1.5.2.2 yamt } 167 1.5.2.2 yamt 168 1.5.2.2 yamt /* Status routine called to get params string. */ 169 1.5.2.2 yamt char * 170 1.5.2.2 yamt dm_target_stripe_status(void *target_config) 171 1.5.2.2 yamt { 172 1.5.2.2 yamt dm_target_stripe_config_t *tsc; 173 1.5.2.2 yamt char *params; 174 1.5.2.2 yamt 175 1.5.2.2 yamt tsc = target_config; 176 1.5.2.2 yamt 177 1.5.2.2 yamt if ((params = kmem_alloc(tsc->params_len, KM_NOSLEEP)) == NULL) 178 1.5.2.2 yamt return NULL; 179 1.5.2.2 yamt 180 1.5.2.2 yamt snprintf(params, tsc->params_len, "%d %"PRIu64" %s %"PRIu64" %s %"PRIu64, 181 1.5.2.2 yamt tsc->stripe_num, tsc->stripe_chunksize, 182 1.5.2.2 yamt tsc->stripe_devs[0].pdev->name, tsc->stripe_devs[0].offset, 183 1.5.2.2 yamt tsc->stripe_devs[1].pdev->name, tsc->stripe_devs[1].offset); 184 1.5.2.2 yamt 185 1.5.2.2 yamt return params; 186 1.5.2.2 yamt } 187 1.5.2.2 yamt 188 1.5.2.2 yamt /* Strategy routine called from dm_strategy. */ 189 1.5.2.2 yamt int 190 1.5.2.2 yamt dm_target_stripe_strategy(dm_table_entry_t *table_en, struct buf *bp) 191 1.5.2.2 yamt { 192 1.5.2.2 yamt dm_target_stripe_config_t *tsc; 193 1.5.2.2 yamt struct buf *nestbuf; 194 1.5.2.2 yamt uint64_t blkno, blkoff; 195 1.5.2.2 yamt uint64_t stripe, stripe_blknr; 196 1.5.2.2 yamt uint32_t stripe_off, stripe_rest, num_blks, issue_blks; 197 1.5.2.2 yamt int stripe_devnr; 198 1.5.2.2 yamt 199 1.5.2.2 yamt tsc = table_en->target_config; 200 1.5.2.2 yamt if (tsc == NULL) 201 1.5.2.2 yamt return 0; 202 1.5.2.2 yamt 203 1.5.2.2 yamt /* printf("Stripe target read function called %" PRIu64 "!!\n", 204 1.5.2.2 yamt tlc->offset);*/ 205 1.5.2.2 yamt 206 1.5.2.2 yamt /* calculate extent of request */ 207 1.5.2.2 yamt KASSERT(bp->b_resid % DEV_BSIZE == 0); 208 1.5.2.2 yamt 209 1.5.2.2 yamt blkno = bp->b_blkno; 210 1.5.2.2 yamt blkoff = 0; 211 1.5.2.2 yamt num_blks = bp->b_resid / DEV_BSIZE; 212 1.5.2.2 yamt for (;;) { 213 1.5.2.2 yamt /* blockno to strip piece nr */ 214 1.5.2.2 yamt stripe = blkno / tsc->stripe_chunksize; 215 1.5.2.2 yamt stripe_off = blkno % tsc->stripe_chunksize; 216 1.5.2.2 yamt 217 1.5.2.2 yamt /* where we are inside the strip */ 218 1.5.2.2 yamt stripe_devnr = stripe % tsc->stripe_num; 219 1.5.2.2 yamt stripe_blknr = stripe / tsc->stripe_num; 220 1.5.2.2 yamt 221 1.5.2.2 yamt /* how much is left before we hit a boundary */ 222 1.5.2.2 yamt stripe_rest = tsc->stripe_chunksize - stripe_off; 223 1.5.2.2 yamt 224 1.5.2.2 yamt /* issue this piece on stripe `stripe' */ 225 1.5.2.2 yamt issue_blks = MIN(stripe_rest, num_blks); 226 1.5.2.2 yamt nestbuf = getiobuf(NULL, true); 227 1.5.2.2 yamt 228 1.5.2.2 yamt nestiobuf_setup(bp, nestbuf, blkoff, issue_blks * DEV_BSIZE); 229 1.5.2.2 yamt nestbuf->b_blkno = stripe_blknr * tsc->stripe_chunksize + stripe_off; 230 1.5.2.2 yamt nestbuf->b_blkno += tsc->stripe_devs[stripe_devnr].offset; 231 1.5.2.2 yamt 232 1.5.2.2 yamt VOP_STRATEGY(tsc->stripe_devs[stripe_devnr].pdev->pdev_vnode, nestbuf); 233 1.5.2.2 yamt 234 1.5.2.2 yamt blkno += issue_blks; 235 1.5.2.2 yamt blkoff += issue_blks * DEV_BSIZE; 236 1.5.2.2 yamt num_blks -= issue_blks; 237 1.5.2.2 yamt 238 1.5.2.2 yamt if (num_blks <= 0) 239 1.5.2.2 yamt break; 240 1.5.2.2 yamt } 241 1.5.2.2 yamt 242 1.5.2.2 yamt return 0; 243 1.5.2.2 yamt } 244 1.5.2.2 yamt 245 1.5.2.2 yamt /* Doesn't do anything here. */ 246 1.5.2.2 yamt int 247 1.5.2.2 yamt dm_target_stripe_destroy(dm_table_entry_t *table_en) 248 1.5.2.2 yamt { 249 1.5.2.2 yamt dm_target_stripe_config_t *tsc; 250 1.5.2.2 yamt 251 1.5.2.2 yamt tsc = table_en->target_config; 252 1.5.2.2 yamt 253 1.5.2.2 yamt if (tsc == NULL) 254 1.5.2.2 yamt return 0; 255 1.5.2.2 yamt 256 1.5.2.2 yamt dm_pdev_decr(tsc->stripe_devs[0].pdev); 257 1.5.2.2 yamt dm_pdev_decr(tsc->stripe_devs[1].pdev); 258 1.5.2.2 yamt 259 1.5.2.2 yamt /* Unbusy target so we can unload it */ 260 1.5.2.2 yamt dm_target_unbusy(table_en->target); 261 1.5.2.2 yamt 262 1.5.2.2 yamt kmem_free(tsc, sizeof(dm_target_stripe_config_t)); 263 1.5.2.2 yamt 264 1.5.2.2 yamt table_en->target_config = NULL; 265 1.5.2.2 yamt 266 1.5.2.2 yamt return 0; 267 1.5.2.2 yamt } 268 1.5.2.2 yamt 269 1.5.2.2 yamt /* Doesn't not need to do anything here. */ 270 1.5.2.2 yamt int 271 1.5.2.2 yamt dm_target_stripe_deps(dm_table_entry_t *table_en, prop_array_t prop_array) 272 1.5.2.2 yamt { 273 1.5.2.2 yamt dm_target_stripe_config_t *tsc; 274 1.5.2.2 yamt struct vattr va; 275 1.5.2.2 yamt 276 1.5.2.2 yamt int error; 277 1.5.2.2 yamt 278 1.5.2.2 yamt if (table_en->target_config == NULL) 279 1.5.2.2 yamt return ENOENT; 280 1.5.2.2 yamt 281 1.5.2.2 yamt tsc = table_en->target_config; 282 1.5.2.2 yamt 283 1.5.2.2 yamt if ((error = VOP_GETATTR(tsc->stripe_devs[0].pdev->pdev_vnode, &va, curlwp->l_cred)) != 0) 284 1.5.2.2 yamt return error; 285 1.5.2.2 yamt 286 1.5.2.2 yamt prop_array_add_uint64(prop_array, (uint64_t)va.va_rdev); 287 1.5.2.2 yamt 288 1.5.2.2 yamt if ((error = VOP_GETATTR(tsc->stripe_devs[1].pdev->pdev_vnode, &va, curlwp->l_cred)) != 0) 289 1.5.2.2 yamt return error; 290 1.5.2.2 yamt 291 1.5.2.2 yamt prop_array_add_uint64(prop_array, (uint64_t)va.va_rdev); 292 1.5.2.2 yamt 293 1.5.2.2 yamt return 0; 294 1.5.2.2 yamt } 295 1.5.2.2 yamt 296 1.5.2.2 yamt /* Unsupported for this target. */ 297 1.5.2.2 yamt int 298 1.5.2.2 yamt dm_target_stripe_upcall(dm_table_entry_t *table_en, struct buf *bp) 299 1.5.2.2 yamt { 300 1.5.2.2 yamt return 0; 301 1.5.2.2 yamt } 302
Indexes created Thu Oct 02 01:09:59 GMT 2025