| 1 | /* $NetBSD: device-mapper.c,v 1.22 2010/03/26 15:46:04 jakllsch Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2010 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 | * I want to say thank you to all people who helped me with this project. |
| 34 | */ |
| 35 | |
| 36 | #include <sys/types.h> |
| 37 | #include <sys/param.h> |
| 38 | |
| 39 | #include <sys/buf.h> |
| 40 | #include <sys/conf.h> |
| 41 | #include <sys/device.h> |
| 42 | #include <sys/devfs.h> |
| 43 | #include <sys/disk.h> |
| 44 | #include <sys/disklabel.h> |
| 45 | #include <sys/dtype.h> |
| 46 | #include <sys/ioccom.h> |
| 47 | #include <sys/malloc.h> |
| 48 | #include <sys/module.h> |
| 49 | #include <sys/sysctl.h> |
| 50 | #include <dev/disk/dm/dm.h> |
| 51 | |
| 52 | #include "netbsd-dm.h" |
| 53 | |
| 54 | static d_ioctl_t dmioctl; |
| 55 | static d_open_t dmopen; |
| 56 | static d_close_t dmclose; |
| 57 | static d_psize_t dmsize; |
| 58 | static d_strategy_t dmstrategy; |
| 59 | static d_dump_t dmdump; |
| 60 | |
| 61 | /* attach and detach routines */ |
| 62 | void dmattach(int); |
| 63 | static int dm_modcmd(module_t mod, int cmd, void *unused); |
| 64 | static int dmdestroy(void); |
| 65 | |
| 66 | static void dm_doinit(void); |
| 67 | |
| 68 | static int dm_cmd_to_fun(prop_dictionary_t); |
| 69 | static int disk_ioctl_switch(cdev_t, u_long, void *); |
| 70 | static int dm_ioctl_switch(u_long); |
| 71 | #if 0 |
| 72 | static void dmminphys(struct buf *); |
| 73 | #endif |
| 74 | |
| 75 | struct devfs_bitmap dm_minor_bitmap; |
| 76 | |
| 77 | /* ***Variable-definitions*** */ |
| 78 | struct dev_ops dm_ops = { |
| 79 | { "dm", 0, D_DISK | D_MPSAFE }, |
| 80 | .d_open = dmopen, |
| 81 | .d_close = dmclose, |
| 82 | .d_read = physread, |
| 83 | .d_write = physwrite, |
| 84 | .d_ioctl = dmioctl, |
| 85 | .d_strategy = dmstrategy, |
| 86 | .d_psize = dmsize, |
| 87 | .d_dump = dmdump, |
| 88 | /* D_DISK */ |
| 89 | }; |
| 90 | |
| 91 | MALLOC_DEFINE(M_DM, "dm", "Device Mapper allocations"); |
| 92 | |
| 93 | int dm_debug_level = 0; |
| 94 | |
| 95 | extern uint64_t dm_dev_counter; |
| 96 | |
| 97 | static cdev_t dmcdev; |
| 98 | |
| 99 | static moduledata_t dm_mod = { |
| 100 | "dm", |
| 101 | dm_modcmd, |
| 102 | NULL |
| 103 | }; |
| 104 | DECLARE_MODULE(dm, dm_mod, SI_SUB_RAID, SI_ORDER_ANY); |
| 105 | MODULE_VERSION(dm, 1); |
| 106 | |
| 107 | /* |
| 108 | * This array is used to translate cmd to function pointer. |
| 109 | * |
| 110 | * Interface between libdevmapper and lvm2tools uses different |
| 111 | * names for one IOCTL call because libdevmapper do another thing |
| 112 | * then. When I run "info" or "mknodes" libdevmapper will send same |
| 113 | * ioctl to kernel but will do another things in userspace. |
| 114 | * |
| 115 | */ |
| 116 | static struct cmd_function cmd_fn[] = { |
| 117 | { .cmd = "version", .fn = dm_get_version_ioctl}, |
| 118 | { .cmd = "targets", .fn = dm_list_versions_ioctl}, |
| 119 | { .cmd = "create", .fn = dm_dev_create_ioctl}, |
| 120 | { .cmd = "info", .fn = dm_dev_status_ioctl}, |
| 121 | { .cmd = "mknodes", .fn = dm_dev_status_ioctl}, |
| 122 | { .cmd = "names", .fn = dm_dev_list_ioctl}, |
| 123 | { .cmd = "suspend", .fn = dm_dev_suspend_ioctl}, |
| 124 | { .cmd = "remove", .fn = dm_dev_remove_ioctl}, |
| 125 | { .cmd = "rename", .fn = dm_dev_rename_ioctl}, |
| 126 | { .cmd = "resume", .fn = dm_dev_resume_ioctl}, |
| 127 | { .cmd = "clear", .fn = dm_table_clear_ioctl}, |
| 128 | { .cmd = "deps", .fn = dm_table_deps_ioctl}, |
| 129 | { .cmd = "reload", .fn = dm_table_load_ioctl}, |
| 130 | { .cmd = "status", .fn = dm_table_status_ioctl}, |
| 131 | { .cmd = "table", .fn = dm_table_status_ioctl}, |
| 132 | {NULL, NULL} |
| 133 | }; |
| 134 | |
| 135 | /* New module handle routine */ |
| 136 | static int |
| 137 | dm_modcmd(module_t mod, int cmd, void *unused) |
| 138 | { |
| 139 | int error, bmajor, cmajor; |
| 140 | |
| 141 | error = 0; |
| 142 | bmajor = -1; |
| 143 | cmajor = -1; |
| 144 | |
| 145 | switch (cmd) { |
| 146 | case MOD_LOAD: |
| 147 | devfs_clone_bitmap_init(&dm_minor_bitmap); |
| 148 | dm_doinit(); |
| 149 | kprintf("Device Mapper version %d.%d.%d loaded\n", |
| 150 | DM_VERSION_MAJOR, DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL); |
| 151 | break; |
| 152 | |
| 153 | case MOD_UNLOAD: |
| 154 | /* |
| 155 | * Disable unloading of dm module if there are any devices |
| 156 | * defined in driver. This is probably too strong we need |
| 157 | * to disable auto-unload only if there is mounted dm device |
| 158 | * present. |
| 159 | */ |
| 160 | if (dm_dev_counter > 0) |
| 161 | return EBUSY; |
| 162 | |
| 163 | error = dmdestroy(); |
| 164 | if (error) |
| 165 | break; |
| 166 | kprintf("Device Mapper unloaded\n"); |
| 167 | break; |
| 168 | |
| 169 | default: |
| 170 | break; |
| 171 | } |
| 172 | |
| 173 | return error; |
| 174 | } |
| 175 | |
| 176 | /* |
| 177 | * dm_detach is called to completely destroy & remove a dm disk device. |
| 178 | */ |
| 179 | int |
| 180 | dm_detach(dm_dev_t *dmv) |
| 181 | { |
| 182 | int minor; |
| 183 | |
| 184 | /* Remove device from list and wait for refcnt to drop to zero */ |
| 185 | dm_dev_rem(dmv, NULL, NULL, -1); |
| 186 | |
| 187 | /* Destroy active table first. */ |
| 188 | dm_table_destroy(&dmv->table_head, DM_TABLE_ACTIVE); |
| 189 | |
| 190 | /* Destroy inactive table if exits, too. */ |
| 191 | dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); |
| 192 | |
| 193 | dm_table_head_destroy(&dmv->table_head); |
| 194 | |
| 195 | minor = dkunit(dmv->devt); |
| 196 | disk_destroy(dmv->diskp); |
| 197 | devstat_remove_entry(&dmv->stats); |
| 198 | |
| 199 | release_dev(dmv->devt); |
| 200 | devfs_clone_bitmap_put(&dm_minor_bitmap, minor); |
| 201 | |
| 202 | /* Destroy device */ |
| 203 | (void)dm_dev_free(dmv); |
| 204 | |
| 205 | /* Decrement device counter After removing device */ |
| 206 | --dm_dev_counter; /* XXX: was atomic 64 */ |
| 207 | |
| 208 | return 0; |
| 209 | } |
| 210 | |
| 211 | static void |
| 212 | dm_doinit(void) |
| 213 | { |
| 214 | dm_target_init(); |
| 215 | dm_dev_init(); |
| 216 | dm_pdev_init(); |
| 217 | dmcdev = make_dev(&dm_ops, 0, UID_ROOT, GID_OPERATOR, 0640, "mapper/control"); |
| 218 | } |
| 219 | |
| 220 | /* Destroy routine */ |
| 221 | static int |
| 222 | dmdestroy(void) |
| 223 | { |
| 224 | destroy_dev(dmcdev); |
| 225 | |
| 226 | dm_dev_destroy(); |
| 227 | dm_pdev_destroy(); |
| 228 | dm_target_destroy(); |
| 229 | |
| 230 | return 0; |
| 231 | } |
| 232 | |
| 233 | static int |
| 234 | dmopen(struct dev_open_args *ap) |
| 235 | { |
| 236 | cdev_t dev = ap->a_head.a_dev; |
| 237 | dm_dev_t *dmv; |
| 238 | |
| 239 | /* Shortcut for the control device */ |
| 240 | if (minor(dev) == 0) |
| 241 | return 0; |
| 242 | |
| 243 | if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) |
| 244 | return ENXIO; |
| 245 | |
| 246 | dmv->is_open = 1; |
| 247 | dm_dev_unbusy(dmv); |
| 248 | |
| 249 | aprint_debug("dm open routine called %" PRIu32 "\n", |
| 250 | minor(ap->a_head.a_dev)); |
| 251 | return 0; |
| 252 | } |
| 253 | |
| 254 | static int |
| 255 | dmclose(struct dev_close_args *ap) |
| 256 | { |
| 257 | cdev_t dev = ap->a_head.a_dev; |
| 258 | dm_dev_t *dmv; |
| 259 | |
| 260 | /* Shortcut for the control device */ |
| 261 | if (minor(dev) == 0) |
| 262 | return 0; |
| 263 | |
| 264 | if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) |
| 265 | return ENXIO; |
| 266 | |
| 267 | dmv->is_open = 0; |
| 268 | dm_dev_unbusy(dmv); |
| 269 | |
| 270 | aprint_debug("dm close routine called %" PRIu32 "\n", |
| 271 | minor(ap->a_head.a_dev)); |
| 272 | return 0; |
| 273 | } |
| 274 | |
| 275 | |
| 276 | static int |
| 277 | dmioctl(struct dev_ioctl_args *ap) |
| 278 | { |
| 279 | cdev_t dev = ap->a_head.a_dev; |
| 280 | u_long cmd = ap->a_cmd; |
| 281 | void *data = ap->a_data; |
| 282 | |
| 283 | int r, err; |
| 284 | prop_dictionary_t dm_dict_in; |
| 285 | |
| 286 | err = r = 0; |
| 287 | |
| 288 | aprint_debug("dmioctl called\n"); |
| 289 | |
| 290 | KKASSERT(data != NULL); |
| 291 | |
| 292 | if (( r = disk_ioctl_switch(dev, cmd, data)) == ENOTTY) { |
| 293 | struct plistref *pref = (struct plistref *) data; |
| 294 | |
| 295 | /* Check if we were called with NETBSD_DM_IOCTL ioctl |
| 296 | otherwise quit. */ |
| 297 | if ((r = dm_ioctl_switch(cmd)) != 0) |
| 298 | return r; |
| 299 | |
| 300 | if((r = prop_dictionary_copyin_ioctl(pref, cmd, &dm_dict_in)) != 0) |
| 301 | return r; |
| 302 | |
| 303 | if ((r = dm_check_version(dm_dict_in)) != 0) |
| 304 | goto cleanup_exit; |
| 305 | |
| 306 | /* run ioctl routine */ |
| 307 | if ((err = dm_cmd_to_fun(dm_dict_in)) != 0) |
| 308 | goto cleanup_exit; |
| 309 | |
| 310 | cleanup_exit: |
| 311 | r = prop_dictionary_copyout_ioctl(pref, cmd, dm_dict_in); |
| 312 | prop_object_release(dm_dict_in); |
| 313 | } |
| 314 | |
| 315 | /* |
| 316 | * Return the error of the actual command if one one has |
| 317 | * happened. Otherwise return 'r' which indicates errors |
| 318 | * that occurred during helper operations. |
| 319 | */ |
| 320 | return (err != 0)?err:r; |
| 321 | } |
| 322 | |
| 323 | /* |
| 324 | * Translate command sent from libdevmapper to func. |
| 325 | */ |
| 326 | static int |
| 327 | dm_cmd_to_fun(prop_dictionary_t dm_dict){ |
| 328 | int i, r; |
| 329 | prop_string_t command; |
| 330 | |
| 331 | r = 0; |
| 332 | |
| 333 | if ((command = prop_dictionary_get(dm_dict, DM_IOCTL_COMMAND)) == NULL) |
| 334 | return EINVAL; |
| 335 | |
| 336 | for(i = 0; cmd_fn[i].cmd != NULL; i++) |
| 337 | if (prop_string_equals_cstring(command, cmd_fn[i].cmd)) |
| 338 | break; |
| 339 | |
| 340 | if (cmd_fn[i].cmd == NULL) |
| 341 | return EINVAL; |
| 342 | |
| 343 | aprint_debug("ioctl %s called\n", cmd_fn[i].cmd); |
| 344 | r = cmd_fn[i].fn(dm_dict); |
| 345 | |
| 346 | return r; |
| 347 | } |
| 348 | |
| 349 | /* Call apropriate ioctl handler function. */ |
| 350 | static int |
| 351 | dm_ioctl_switch(u_long cmd) |
| 352 | { |
| 353 | |
| 354 | switch(cmd) { |
| 355 | |
| 356 | case NETBSD_DM_IOCTL: |
| 357 | aprint_debug("dm NetBSD_DM_IOCTL called\n"); |
| 358 | break; |
| 359 | default: |
| 360 | aprint_debug("dm unknown ioctl called\n"); |
| 361 | return ENOTTY; |
| 362 | break; /* NOT REACHED */ |
| 363 | } |
| 364 | |
| 365 | return 0; |
| 366 | } |
| 367 | |
| 368 | /* |
| 369 | * Check for disk specific ioctls. |
| 370 | */ |
| 371 | |
| 372 | static int |
| 373 | disk_ioctl_switch(cdev_t dev, u_long cmd, void *data) |
| 374 | { |
| 375 | dm_dev_t *dmv; |
| 376 | |
| 377 | /* disk ioctls make sense only on block devices */ |
| 378 | if (minor(dev) == 0) |
| 379 | return ENOTTY; |
| 380 | |
| 381 | switch(cmd) { |
| 382 | case DIOCGPART: |
| 383 | { |
| 384 | struct partinfo *dpart; |
| 385 | u_int64_t size; |
| 386 | dpart = (void *)data; |
| 387 | bzero(dpart, sizeof(*dpart)); |
| 388 | |
| 389 | if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) |
| 390 | return ENODEV; |
| 391 | if (dmv->diskp->d_info.d_media_blksize == 0) { |
| 392 | dm_dev_unbusy(dmv); |
| 393 | return ENOTSUP; |
| 394 | } else { |
| 395 | size = dm_table_size(&dmv->table_head); |
| 396 | dpart->media_offset = 0; |
| 397 | dpart->media_size = size * DEV_BSIZE; |
| 398 | dpart->media_blocks = size; |
| 399 | dpart->media_blksize = DEV_BSIZE; |
| 400 | dpart->fstype = FS_BSDFFS; |
| 401 | } |
| 402 | dm_dev_unbusy(dmv); |
| 403 | break; |
| 404 | } |
| 405 | |
| 406 | default: |
| 407 | aprint_debug("unknown disk_ioctl called\n"); |
| 408 | return ENOTTY; |
| 409 | break; /* NOT REACHED */ |
| 410 | } |
| 411 | |
| 412 | return 0; |
| 413 | } |
| 414 | |
| 415 | /* |
| 416 | * Do all IO operations on dm logical devices. |
| 417 | */ |
| 418 | static int |
| 419 | dmstrategy(struct dev_strategy_args *ap) |
| 420 | { |
| 421 | cdev_t dev = ap->a_head.a_dev; |
| 422 | struct bio *bio = ap->a_bio; |
| 423 | struct buf *bp = bio->bio_buf; |
| 424 | int bypass; |
| 425 | |
| 426 | dm_dev_t *dmv; |
| 427 | dm_table_t *tbl; |
| 428 | dm_table_entry_t *table_en; |
| 429 | struct buf *nestbuf; |
| 430 | |
| 431 | uint32_t dev_type; |
| 432 | |
| 433 | uint64_t buf_start, buf_len, issued_len; |
| 434 | uint64_t table_start, table_end; |
| 435 | uint64_t start, end; |
| 436 | |
| 437 | buf_start = bio->bio_offset; |
| 438 | buf_len = bp->b_bcount; |
| 439 | |
| 440 | tbl = NULL; |
| 441 | |
| 442 | table_end = 0; |
| 443 | dev_type = 0; |
| 444 | issued_len = 0; |
| 445 | |
| 446 | if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) { |
| 447 | bp->b_error = EIO; |
| 448 | bp->b_resid = bp->b_bcount; |
| 449 | biodone(bio); |
| 450 | return 0; |
| 451 | } |
| 452 | |
| 453 | switch(bp->b_cmd) { |
| 454 | case BUF_CMD_READ: |
| 455 | case BUF_CMD_WRITE: |
| 456 | case BUF_CMD_FREEBLKS: |
| 457 | bypass = 0; |
| 458 | break; |
| 459 | case BUF_CMD_FLUSH: |
| 460 | bypass = 1; |
| 461 | KKASSERT(buf_len == 0); |
| 462 | break; |
| 463 | default: |
| 464 | dm_dev_unbusy(dmv); |
| 465 | bp->b_error = EIO; |
| 466 | bp->b_resid = bp->b_bcount; |
| 467 | biodone(bio); |
| 468 | return 0; |
| 469 | } |
| 470 | |
| 471 | if (bypass == 0 && |
| 472 | bounds_check_with_mediasize(bio, DEV_BSIZE, |
| 473 | dm_table_size(&dmv->table_head)) <= 0) { |
| 474 | dm_dev_unbusy(dmv); |
| 475 | bp->b_resid = bp->b_bcount; |
| 476 | biodone(bio); |
| 477 | return 0; |
| 478 | } |
| 479 | |
| 480 | /* Select active table */ |
| 481 | tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_ACTIVE); |
| 482 | |
| 483 | nestiobuf_init(bio); |
| 484 | devstat_start_transaction(&dmv->stats); |
| 485 | |
| 486 | /* |
| 487 | * Find out what tables I want to select. |
| 488 | */ |
| 489 | SLIST_FOREACH(table_en, tbl, next) { |
| 490 | /* |
| 491 | * I need need number of bytes not blocks. |
| 492 | */ |
| 493 | table_start = table_en->start * DEV_BSIZE; |
| 494 | table_end = table_start + (table_en->length) * DEV_BSIZE; |
| 495 | |
| 496 | /* |
| 497 | * Calculate the start and end |
| 498 | */ |
| 499 | start = MAX(table_start, buf_start); |
| 500 | end = MIN(table_end, buf_start + buf_len); |
| 501 | |
| 502 | aprint_debug("----------------------------------------\n"); |
| 503 | aprint_debug("table_start %010" PRIu64", table_end %010" |
| 504 | PRIu64 "\n", table_start, table_end); |
| 505 | aprint_debug("buf_start %010" PRIu64", buf_len %010" |
| 506 | PRIu64"\n", buf_start, buf_len); |
| 507 | aprint_debug("start-buf_start %010"PRIu64", end %010" |
| 508 | PRIu64"\n", start - buf_start, end); |
| 509 | aprint_debug("start %010" PRIu64" , end %010" |
| 510 | PRIu64"\n", start, end); |
| 511 | aprint_debug("\n----------------------------------------\n"); |
| 512 | |
| 513 | if (bypass) { |
| 514 | nestbuf = getpbuf(NULL); |
| 515 | nestbuf->b_flags |= bio->bio_buf->b_flags & B_HASBOGUS; |
| 516 | |
| 517 | nestiobuf_add(bio, nestbuf, 0, 0, &dmv->stats); |
| 518 | nestbuf->b_bio1.bio_offset = 0; |
| 519 | table_en->target->strategy(table_en, nestbuf); |
| 520 | } else if (start < end) { |
| 521 | nestbuf = getpbuf(NULL); |
| 522 | nestbuf->b_flags |= bio->bio_buf->b_flags & B_HASBOGUS; |
| 523 | |
| 524 | nestiobuf_add(bio, nestbuf, |
| 525 | start - buf_start, (end - start), |
| 526 | &dmv->stats); |
| 527 | issued_len += end - start; |
| 528 | |
| 529 | nestbuf->b_bio1.bio_offset = (start - table_start); |
| 530 | table_en->target->strategy(table_en, nestbuf); |
| 531 | } |
| 532 | } |
| 533 | |
| 534 | if (issued_len < buf_len) |
| 535 | nestiobuf_error(bio, EINVAL); |
| 536 | nestiobuf_start(bio); |
| 537 | dm_table_release(&dmv->table_head, DM_TABLE_ACTIVE); |
| 538 | dm_dev_unbusy(dmv); |
| 539 | |
| 540 | return 0; |
| 541 | } |
| 542 | |
| 543 | static int |
| 544 | dmdump(struct dev_dump_args *ap) |
| 545 | { |
| 546 | cdev_t dev = ap->a_head.a_dev; |
| 547 | dm_dev_t *dmv; |
| 548 | dm_table_t *tbl; |
| 549 | dm_table_entry_t *table_en; |
| 550 | uint32_t dev_type; |
| 551 | uint64_t buf_start, buf_len, issued_len; |
| 552 | uint64_t table_start, table_end; |
| 553 | uint64_t start, end, data_offset; |
| 554 | off_t offset; |
| 555 | size_t length; |
| 556 | int error = 0; |
| 557 | |
| 558 | buf_start = ap->a_offset; |
| 559 | buf_len = ap->a_length; |
| 560 | |
| 561 | tbl = NULL; |
| 562 | |
| 563 | table_end = 0; |
| 564 | dev_type = 0; |
| 565 | issued_len = 0; |
| 566 | |
| 567 | if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) { |
| 568 | return EIO; |
| 569 | } |
| 570 | |
| 571 | /* Select active table */ |
| 572 | tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_ACTIVE); |
| 573 | |
| 574 | |
| 575 | /* |
| 576 | * Find out what tables I want to select. |
| 577 | */ |
| 578 | SLIST_FOREACH(table_en, tbl, next) { |
| 579 | /* |
| 580 | * I need need number of bytes not blocks. |
| 581 | */ |
| 582 | table_start = table_en->start * DEV_BSIZE; |
| 583 | table_end = table_start + (table_en->length) * DEV_BSIZE; |
| 584 | |
| 585 | /* |
| 586 | * Calculate the start and end |
| 587 | */ |
| 588 | start = MAX(table_start, buf_start); |
| 589 | end = MIN(table_end, buf_start + buf_len); |
| 590 | |
| 591 | if (ap->a_length == 0) { |
| 592 | if (table_en->target->dump == NULL) { |
| 593 | error = ENXIO; |
| 594 | goto out; |
| 595 | } |
| 596 | |
| 597 | table_en->target->dump(table_en, NULL, 0, 0); |
| 598 | } else if (start < end) { |
| 599 | data_offset = start - buf_start; |
| 600 | offset = start - table_start; |
| 601 | length = end - start; |
| 602 | |
| 603 | if (table_en->target->dump == NULL) { |
| 604 | error = ENXIO; |
| 605 | goto out; |
| 606 | } |
| 607 | |
| 608 | table_en->target->dump(table_en, |
| 609 | (char *)ap->a_virtual + data_offset, |
| 610 | length, offset); |
| 611 | |
| 612 | issued_len += end - start; |
| 613 | } |
| 614 | } |
| 615 | |
| 616 | if (issued_len < buf_len) |
| 617 | error = EINVAL; |
| 618 | |
| 619 | out: |
| 620 | dm_table_release(&dmv->table_head, DM_TABLE_ACTIVE); |
| 621 | dm_dev_unbusy(dmv); |
| 622 | |
| 623 | return error; |
| 624 | } |
| 625 | |
| 626 | static int |
| 627 | dmsize(struct dev_psize_args *ap) |
| 628 | { |
| 629 | cdev_t dev = ap->a_head.a_dev; |
| 630 | dm_dev_t *dmv; |
| 631 | uint64_t size; |
| 632 | |
| 633 | size = 0; |
| 634 | |
| 635 | if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) |
| 636 | return ENOENT; |
| 637 | |
| 638 | size = dm_table_size(&dmv->table_head); |
| 639 | dm_dev_unbusy(dmv); |
| 640 | |
| 641 | ap->a_result = (int64_t)size; |
| 642 | |
| 643 | return 0; |
| 644 | } |
| 645 | |
| 646 | #if 0 |
| 647 | static void |
| 648 | dmminphys(struct buf *bp) |
| 649 | { |
| 650 | |
| 651 | bp->b_bcount = MIN(bp->b_bcount, MAXPHYS); |
| 652 | } |
| 653 | #endif |
| 654 | |
| 655 | void |
| 656 | dmsetdiskinfo(struct disk *disk, dm_table_head_t *head) |
| 657 | { |
| 658 | struct disk_info info; |
| 659 | uint64_t dmp_size; |
| 660 | |
| 661 | dmp_size = dm_table_size(head); |
| 662 | |
| 663 | bzero(&info, sizeof(struct disk_info)); |
| 664 | info.d_media_blksize = DEV_BSIZE; |
| 665 | info.d_media_blocks = dmp_size; |
| 666 | #if 0 |
| 667 | /* this is set by disk_setdiskinfo */ |
| 668 | info.d_media_size = dmp_size * DEV_BSIZE; |
| 669 | #endif |
| 670 | info.d_dsflags = DSO_MBRQUIET | DSO_DEVICEMAPPER; |
| 671 | |
| 672 | info.d_secpertrack = 32; |
| 673 | info.d_nheads = 64; |
| 674 | info.d_secpercyl = info.d_secpertrack * info.d_nheads; |
| 675 | info.d_ncylinders = dmp_size / info.d_secpercyl; |
| 676 | |
| 677 | disk_setdiskinfo(disk, &info); |
| 678 | } |
| 679 | |
| 680 | void |
| 681 | dm_builtin_init(void *arg) |
| 682 | { |
| 683 | modeventhand_t evh = (modeventhand_t)arg; |
| 684 | |
| 685 | KKASSERT(evh != NULL); |
| 686 | evh(NULL, MOD_LOAD, NULL); |
| 687 | } |
| 688 | |
| 689 | void |
| 690 | dm_builtin_uninit(void *arg) |
| 691 | { |
| 692 | modeventhand_t evh = (modeventhand_t)arg; |
| 693 | |
| 694 | KKASSERT(evh != NULL); |
| 695 | evh(NULL, MOD_UNLOAD, NULL); |
| 696 | } |
| 697 | |
| 698 | TUNABLE_INT("debug.dm_debug", &dm_debug_level); |
| 699 | SYSCTL_INT(_debug, OID_AUTO, dm_debug, CTLFLAG_RW, &dm_debug_level, |
| 700 | 0, "Eanble device mapper debugging"); |
| 701 | |