| 1 | /* $NetBSD: dm_target_linear.c,v 1.14 2014/06/14 07:39:00 hannken 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 | |
| 196 | if (table_en->target_config == NULL) |
| 197 | return ENOENT; |
| 198 | |
| 199 | tlc = table_en->target_config; |
| 200 | |
| 201 | prop_array_add_uint64(prop_array, |
| 202 | (uint64_t) tlc->pdev->pdev_vnode->v_rdev); |
| 203 | |
| 204 | return 0; |
| 205 | } |
| 206 | /* |
| 207 | * Register upcall device. |
| 208 | * Linear target doesn't need any upcall devices but other targets like |
| 209 | * mirror, snapshot, multipath, stripe will use this functionality. |
| 210 | */ |
| 211 | int |
| 212 | dm_target_linear_upcall(dm_table_entry_t * table_en, struct buf * bp) |
| 213 | { |
| 214 | return 0; |
| 215 | } |
| 216 | /* |
| 217 | * Query physical block size of this target |
| 218 | * For a linear target this is just the sector size of the underlying device |
| 219 | */ |
| 220 | int |
| 221 | dm_target_linear_secsize(dm_table_entry_t * table_en, unsigned *secsizep) |
| 222 | { |
| 223 | dm_target_linear_config_t *tlc; |
| 224 | unsigned secsize; |
| 225 | |
| 226 | secsize = 0; |
| 227 | |
| 228 | tlc = table_en->target_config; |
| 229 | if (tlc != NULL) |
| 230 | secsize = tlc->pdev->pdev_secsize; |
| 231 | |
| 232 | *secsizep = secsize; |
| 233 | |
| 234 | return 0; |
| 235 | } |
| 236 | /* |
| 237 | * Transform char s to uint64_t offset number. |
| 238 | */ |
| 239 | uint64_t |
| 240 | atoi(const char *s) |
| 241 | { |
| 242 | uint64_t n; |
| 243 | n = 0; |
| 244 | |
| 245 | while (*s != '\0') { |
| 246 | if (!isdigit(*s)) |
| 247 | break; |
| 248 | |
| 249 | n = (10 * n) + (*s - '0'); |
| 250 | s++; |
| 251 | } |
| 252 | |
| 253 | return n; |
| 254 | } |
| 255 | |