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/disk.h> 43 #include <sys/disklabel.h> 44 #include <sys/dtype.h> 45 #include <sys/ioccom.h> 46 #include <sys/malloc.h> 47 #include <sys/module.h> 48 #include <sys/sysctl.h> 49 50 #include "netbsd-dm.h" 51 #include "dm.h" 52 53 static d_ioctl_t dmioctl; 54 static d_open_t dmopen; 55 static d_close_t dmclose; 56 static d_psize_t dmsize; 57 static d_strategy_t dmstrategy; 58 59 /* attach and detach routines */ 60 void dmattach(int); 61 static int dm_modcmd(module_t mod, int cmd, void *unused); 62 static int dmdestroy(void); 63 64 static void dm_doinit(void); 65 66 static int dm_cmd_to_fun(prop_dictionary_t); 67 static int disk_ioctl_switch(cdev_t, u_long, void *); 68 static int dm_ioctl_switch(u_long); 69 #if 0 70 static void dmminphys(struct buf *); 71 #endif 72 73 /* ***Variable-definitions*** */ 74 struct dev_ops dm_ops = { 75 { "dm", 0, D_DISK | 76 D_MPSAFE_READ | D_MPSAFE_WRITE | D_MPSAFE_IOCTL }, 77 .d_open = dmopen, 78 .d_close = dmclose, 79 .d_read = physread, 80 .d_write = physwrite, 81 .d_ioctl = dmioctl, 82 .d_strategy = dmstrategy, 83 .d_psize = dmsize, 84 /* D_DISK */ 85 }; 86 87 MALLOC_DEFINE(M_DM, "dm", "Device Mapper allocations"); 88 89 int dm_debug_level = 0; 90 91 extern uint64_t dm_dev_counter; 92 93 static cdev_t dmcdev; 94 95 static moduledata_t dm_mod = { 96 "dm", 97 dm_modcmd, 98 NULL 99 }; 100 DECLARE_MODULE(dm, dm_mod, SI_SUB_RAID, SI_ORDER_ANY); 101 102 /* 103 * This array is used to translate cmd to function pointer. 104 * 105 * Interface between libdevmapper and lvm2tools uses different 106 * names for one IOCTL call because libdevmapper do another thing 107 * then. When I run "info" or "mknodes" libdevmapper will send same 108 * ioctl to kernel but will do another things in userspace. 109 * 110 */ 111 static struct cmd_function cmd_fn[] = { 112 { .cmd = "version", .fn = dm_get_version_ioctl}, 113 { .cmd = "targets", .fn = dm_list_versions_ioctl}, 114 { .cmd = "create", .fn = dm_dev_create_ioctl}, 115 { .cmd = "info", .fn = dm_dev_status_ioctl}, 116 { .cmd = "mknodes", .fn = dm_dev_status_ioctl}, 117 { .cmd = "names", .fn = dm_dev_list_ioctl}, 118 { .cmd = "suspend", .fn = dm_dev_suspend_ioctl}, 119 { .cmd = "remove", .fn = dm_dev_remove_ioctl}, 120 { .cmd = "rename", .fn = dm_dev_rename_ioctl}, 121 { .cmd = "resume", .fn = dm_dev_resume_ioctl}, 122 { .cmd = "clear", .fn = dm_table_clear_ioctl}, 123 { .cmd = "deps", .fn = dm_table_deps_ioctl}, 124 { .cmd = "reload", .fn = dm_table_load_ioctl}, 125 { .cmd = "status", .fn = dm_table_status_ioctl}, 126 { .cmd = "table", .fn = dm_table_status_ioctl}, 127 {NULL, NULL} 128 }; 129 130 /* New module handle routine */ 131 static int 132 dm_modcmd(module_t mod, int cmd, void *unused) 133 { 134 int error, bmajor, cmajor; 135 136 error = 0; 137 bmajor = -1; 138 cmajor = -1; 139 140 switch (cmd) { 141 case MOD_LOAD: 142 dm_doinit(); 143 kprintf("Device Mapper version %d.%d.%d loaded\n", 144 DM_VERSION_MAJOR, DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL); 145 break; 146 147 case MOD_UNLOAD: 148 /* 149 * Disable unloading of dm module if there are any devices 150 * defined in driver. This is probably too strong we need 151 * to disable auto-unload only if there is mounted dm device 152 * present. 153 */ 154 if (dm_dev_counter > 0) 155 return EBUSY; 156 157 error = dmdestroy(); 158 if (error) 159 break; 160 kprintf("Device Mapper unloaded\n"); 161 break; 162 163 default: 164 break; 165 } 166 167 return error; 168 } 169 170 /* 171 * dm_detach: 172 * 173 * Autoconfiguration detach function for pseudo-device glue. 174 * This routine is called by dm_ioctl::dm_dev_remove_ioctl and by autoconf to 175 * remove devices created in device-mapper. 176 */ 177 int 178 dm_detach(dm_dev_t *dmv) 179 { 180 disable_dev(dmv); 181 182 /* Destroy active table first. */ 183 dm_table_destroy(&dmv->table_head, DM_TABLE_ACTIVE); 184 185 /* Destroy inactive table if exits, too. */ 186 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 187 188 dm_table_head_destroy(&dmv->table_head); 189 190 destroy_dev(dmv->devt); 191 192 /* Destroy device */ 193 (void)dm_dev_free(dmv); 194 195 /* Decrement device counter After removing device */ 196 --dm_dev_counter; /* XXX: was atomic 64 */ 197 198 return 0; 199 } 200 201 static void 202 dm_doinit(void) 203 { 204 dm_target_init(); 205 dm_dev_init(); 206 dm_pdev_init(); 207 dmcdev = make_dev(&dm_ops, 0, UID_ROOT, GID_OPERATOR, 0640, "mapper/control"); 208 } 209 210 /* Destroy routine */ 211 static int 212 dmdestroy(void) 213 { 214 destroy_dev(dmcdev); 215 216 dm_dev_destroy(); 217 dm_pdev_destroy(); 218 dm_target_destroy(); 219 220 return 0; 221 } 222 223 static int 224 dmopen(struct dev_open_args *ap) 225 { 226 227 aprint_debug("dm open routine called %" PRIu32 "\n", 228 minor(ap->a_head.a_dev)); 229 return 0; 230 } 231 232 static int 233 dmclose(struct dev_close_args *ap) 234 { 235 236 aprint_debug("dm close routine called %" PRIu32 "\n", 237 minor(ap->a_head.a_dev)); 238 return 0; 239 } 240 241 242 static int 243 dmioctl(struct dev_ioctl_args *ap) 244 { 245 cdev_t dev = ap->a_head.a_dev; 246 u_long cmd = ap->a_cmd; 247 void *data = ap->a_data; 248 249 int r; 250 prop_dictionary_t dm_dict_in; 251 252 r = 0; 253 254 aprint_debug("dmioctl called\n"); 255 256 KKASSERT(data != NULL); 257 258 if (( r = disk_ioctl_switch(dev, cmd, data)) == ENOTTY) { 259 struct plistref *pref = (struct plistref *) data; 260 261 /* Check if we were called with NETBSD_DM_IOCTL ioctl 262 otherwise quit. */ 263 if ((r = dm_ioctl_switch(cmd)) != 0) 264 return r; 265 266 if((r = prop_dictionary_copyin_ioctl(pref, cmd, &dm_dict_in)) != 0) 267 return r; 268 269 if ((r = dm_check_version(dm_dict_in)) != 0) 270 goto cleanup_exit; 271 272 /* run ioctl routine */ 273 if ((r = dm_cmd_to_fun(dm_dict_in)) != 0) 274 goto cleanup_exit; 275 276 cleanup_exit: 277 r = prop_dictionary_copyout_ioctl(pref, cmd, dm_dict_in); 278 prop_object_release(dm_dict_in); 279 } 280 281 return r; 282 } 283 284 /* 285 * Translate command sent from libdevmapper to func. 286 */ 287 static int 288 dm_cmd_to_fun(prop_dictionary_t dm_dict){ 289 int i, r; 290 prop_string_t command; 291 292 r = 0; 293 294 if ((command = prop_dictionary_get(dm_dict, DM_IOCTL_COMMAND)) == NULL) 295 return EINVAL; 296 297 for(i = 0; cmd_fn[i].cmd != NULL; i++) 298 if (prop_string_equals_cstring(command, cmd_fn[i].cmd)) 299 break; 300 301 if (cmd_fn[i].cmd == NULL) 302 return EINVAL; 303 304 aprint_debug("ioctl %s called\n", cmd_fn[i].cmd); 305 r = cmd_fn[i].fn(dm_dict); 306 307 return r; 308 } 309 310 /* Call apropriate ioctl handler function. */ 311 static int 312 dm_ioctl_switch(u_long cmd) 313 { 314 315 switch(cmd) { 316 317 case NETBSD_DM_IOCTL: 318 aprint_debug("dm NetBSD_DM_IOCTL called\n"); 319 break; 320 default: 321 aprint_debug("dm unknown ioctl called\n"); 322 return ENOTTY; 323 break; /* NOT REACHED */ 324 } 325 326 return 0; 327 } 328 329 /* 330 * Check for disk specific ioctls. 331 */ 332 333 static int 334 disk_ioctl_switch(cdev_t dev, u_long cmd, void *data) 335 { 336 dm_dev_t *dmv; 337 338 /* disk ioctls make sense only on block devices */ 339 if (minor(dev) == 0) 340 return ENOTTY; 341 342 switch(cmd) { 343 case DIOCGPART: 344 { 345 struct partinfo *dpart; 346 u_int64_t size; 347 dpart = (void *)data; 348 bzero(dpart, sizeof(*dpart)); 349 350 if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) 351 return ENODEV; 352 if (dmv->diskp->d_info.d_media_blksize == 0) { 353 dm_dev_unbusy(dmv); 354 return ENOTSUP; 355 } else { 356 size = dm_table_size(&dmv->table_head); 357 dpart->media_offset = 0; 358 dpart->media_size = size * DEV_BSIZE; 359 dpart->media_blocks = size; 360 dpart->media_blksize = DEV_BSIZE; 361 dpart->fstype = FS_BSDFFS; 362 } 363 dm_dev_unbusy(dmv); 364 break; 365 } 366 367 default: 368 aprint_debug("unknown disk_ioctl called\n"); 369 return ENOTTY; 370 break; /* NOT REACHED */ 371 } 372 373 return 0; 374 } 375 376 /* 377 * Do all IO operations on dm logical devices. 378 */ 379 static int 380 dmstrategy(struct dev_strategy_args *ap) 381 { 382 cdev_t dev = ap->a_head.a_dev; 383 struct bio *bio = ap->a_bio; 384 struct buf *bp = bio->bio_buf; 385 386 dm_dev_t *dmv; 387 dm_table_t *tbl; 388 dm_table_entry_t *table_en; 389 struct buf *nestbuf; 390 391 uint32_t dev_type; 392 393 uint64_t buf_start, buf_len, issued_len; 394 uint64_t table_start, table_end; 395 uint64_t start, end; 396 397 buf_start = bio->bio_offset; 398 buf_len = bp->b_bcount; 399 400 tbl = NULL; 401 402 table_end = 0; 403 dev_type = 0; 404 issued_len = 0; 405 406 if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) { 407 bp->b_error = EIO; 408 bp->b_resid = bp->b_bcount; 409 biodone(bio); 410 return 0; 411 } 412 413 if (bounds_check_with_mediasize(bio, DEV_BSIZE, 414 dm_table_size(&dmv->table_head)) <= 0) { 415 dm_dev_unbusy(dmv); 416 bp->b_resid = bp->b_bcount; 417 biodone(bio); 418 return 0; 419 } 420 421 /* Select active table */ 422 tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_ACTIVE); 423 424 /* Nested buffers count down to zero therefore I have 425 to set bp->b_resid to maximal value. */ 426 bp->b_resid = bp->b_bcount; 427 428 /* 429 * Find out what tables I want to select. 430 */ 431 SLIST_FOREACH(table_en, tbl, next) 432 { 433 /* I need need number of bytes not blocks. */ 434 table_start = table_en->start * DEV_BSIZE; 435 /* 436 * I have to sub 1 from table_en->length to prevent 437 * off by one error 438 */ 439 table_end = table_start + (table_en->length)* DEV_BSIZE; 440 441 start = MAX(table_start, buf_start); 442 443 end = MIN(table_end, buf_start + buf_len); 444 445 aprint_debug("----------------------------------------\n"); 446 aprint_debug("table_start %010" PRIu64", table_end %010" 447 PRIu64 "\n", table_start, table_end); 448 aprint_debug("buf_start %010" PRIu64", buf_len %010" 449 PRIu64"\n", buf_start, buf_len); 450 aprint_debug("start-buf_start %010"PRIu64", end %010" 451 PRIu64"\n", start - buf_start, end); 452 aprint_debug("start %010" PRIu64" , end %010" 453 PRIu64"\n", start, end); 454 aprint_debug("\n----------------------------------------\n"); 455 456 if (start < end) { 457 /* create nested buffer */ 458 nestbuf = getpbuf(NULL); 459 460 nestiobuf_setup(bio, nestbuf, start - buf_start, 461 (end - start)); 462 463 issued_len += end - start; 464 465 /* I need number of bytes. */ 466 nestbuf->b_bio1.bio_offset = (start - table_start); 467 468 table_en->target->strategy(table_en, nestbuf); 469 } 470 } 471 472 if (issued_len < buf_len) 473 nestiobuf_done(bio, buf_len - issued_len, EINVAL); 474 475 dm_table_release(&dmv->table_head, DM_TABLE_ACTIVE); 476 dm_dev_unbusy(dmv); 477 478 return 0; 479 } 480 481 static int 482 dmsize(struct dev_psize_args *ap) 483 { 484 cdev_t dev = ap->a_head.a_dev; 485 dm_dev_t *dmv; 486 uint64_t size; 487 488 size = 0; 489 490 if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) 491 return -ENOENT; 492 493 size = dm_table_size(&dmv->table_head); 494 dm_dev_unbusy(dmv); 495 496 return size; 497 } 498 499 #if 0 500 static void 501 dmminphys(struct buf *bp) 502 { 503 504 bp->b_bcount = MIN(bp->b_bcount, MAXPHYS); 505 } 506 #endif 507 508 void 509 dmsetdiskinfo(struct disk *disk, dm_table_head_t *head) 510 { 511 struct disk_info info; 512 int dmp_size; 513 514 dmp_size = dm_table_size(head); 515 516 bzero(&info, sizeof(struct disk_info)); 517 info.d_media_blksize = DEV_BSIZE; 518 info.d_media_blocks = dmp_size; 519 info.d_media_size = dmp_size * DEV_BSIZE; 520 info.d_dsflags = DSO_MBRQUIET; /* XXX */ 521 info.d_secpertrack = 32; 522 info.d_nheads = 64; 523 info.d_secpercyl = info.d_secpertrack * info.d_nheads; 524 info.d_ncylinders = dmp_size / 2048; 525 bcopy(&info, &disk->d_info, sizeof(disk->d_info)); 526 } 527 528 prop_dictionary_t 529 dmgetdiskinfo(struct disk *disk) 530 { 531 prop_dictionary_t disk_info, geom; 532 struct disk_info *pinfo; 533 534 pinfo = &disk->d_info; 535 536 disk_info = prop_dictionary_create(); 537 geom = prop_dictionary_create(); 538 539 prop_dictionary_set_cstring_nocopy(disk_info, "type", "ESDI"); 540 prop_dictionary_set_uint64(geom, "sectors-per-unit", pinfo->d_media_blocks); 541 prop_dictionary_set_uint32(geom, "sector-size", 542 DEV_BSIZE /* XXX 512? */); 543 prop_dictionary_set_uint32(geom, "sectors-per-track", 32); 544 prop_dictionary_set_uint32(geom, "tracks-per-cylinder", 64); 545 prop_dictionary_set_uint32(geom, "cylinders-per-unit", 546 pinfo->d_media_blocks / 2048); 547 prop_dictionary_set(disk_info, "geometry", geom); 548 prop_object_release(geom); 549 550 return disk_info; 551 } 552 553 void 554 dmgetproperties(struct disk *disk, dm_table_head_t *head) 555 { 556 #if 0 557 prop_dictionary_t disk_info, odisk_info, geom; 558 int dmp_size; 559 560 dmp_size = dm_table_size(head); 561 disk_info = prop_dictionary_create(); 562 geom = prop_dictionary_create(); 563 564 prop_dictionary_set_cstring_nocopy(disk_info, "type", "ESDI"); 565 prop_dictionary_set_uint64(geom, "sectors-per-unit", dmp_size); 566 prop_dictionary_set_uint32(geom, "sector-size", 567 DEV_BSIZE /* XXX 512? */); 568 prop_dictionary_set_uint32(geom, "sectors-per-track", 32); 569 prop_dictionary_set_uint32(geom, "tracks-per-cylinder", 64); 570 prop_dictionary_set_uint32(geom, "cylinders-per-unit", dmp_size / 2048); 571 prop_dictionary_set(disk_info, "geometry", geom); 572 prop_object_release(geom); 573 574 odisk_info = disk->dk_info; 575 disk->dk_info = disk_info; 576 577 if (odisk_info != NULL) 578 prop_object_release(odisk_info); 579 #endif 580 } 581 582 TUNABLE_INT("debug.dm_debug", &dm_debug_level); 583 SYSCTL_INT(_debug, OID_AUTO, dm_debug, CTLFLAG_RW, &dm_debug_level, 584 0, "Eanble device mapper debugging"); 585 586