device-mapper.c revision 1.14
1 /* $NetBSD: device-mapper.c,v 1.14 2010/01/03 22:55:25 haad 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 * 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/dkio.h> 43 #include <sys/disk.h> 44 #include <sys/disklabel.h> 45 #include <sys/ioctl.h> 46 #include <sys/ioccom.h> 47 #include <sys/kmem.h> 48 #include <sys/module.h> 49 50 #include "netbsd-dm.h" 51 #include "dm.h" 52 53 static dev_type_open(dmopen); 54 static dev_type_close(dmclose); 55 static dev_type_read(dmread); 56 static dev_type_write(dmwrite); 57 static dev_type_ioctl(dmioctl); 58 static dev_type_strategy(dmstrategy); 59 static dev_type_size(dmsize); 60 61 /* attach and detach routines */ 62 static int dmattach(void); 63 static int dmdestroy(void); 64 65 static int dm_cmd_to_fun(prop_dictionary_t); 66 static int disk_ioctl_switch(dev_t, u_long, void *); 67 static int dm_ioctl_switch(u_long); 68 static void dmminphys(struct buf *); 69 70 /* CF attach/detach functions used for power management */ 71 static int dm_detach(device_t, int); 72 static void dm_attach(device_t, device_t, void *); 73 static int dm_match(device_t, cfdata_t, void *); 74 75 /* ***Variable-definitions*** */ 76 const struct bdevsw dm_bdevsw = { 77 .d_open = dmopen, 78 .d_close = dmclose, 79 .d_strategy = dmstrategy, 80 .d_ioctl = dmioctl, 81 .d_dump = nodump, 82 .d_psize = dmsize, 83 .d_flag = D_DISK | D_MPSAFE 84 }; 85 86 const struct cdevsw dm_cdevsw = { 87 .d_open = dmopen, 88 .d_close = dmclose, 89 .d_read = dmread, 90 .d_write = dmwrite, 91 .d_ioctl = dmioctl, 92 .d_stop = nostop, 93 .d_tty = notty, 94 .d_poll = nopoll, 95 .d_mmap = nommap, 96 .d_kqfilter = nokqfilter, 97 .d_flag = D_DISK | D_MPSAFE 98 }; 99 100 const struct dkdriver dmdkdriver = { 101 .d_strategy = dmstrategy 102 }; 103 104 /* Autoconf defines */ 105 CFDRIVER_DECL(dm, DV_DISK, NULL); 106 CFATTACH_DECL3_NEW(dm, 0, 107 dm_match, dm_attach, dm_detach, NULL, NULL, NULL, 108 DVF_DETACH_SHUTDOWN); 109 110 extern struct cfdriver dm_cd; 111 112 extern uint64_t dev_counter; 113 114 /* 115 * This array is used to translate cmd to function pointer. 116 * 117 * Interface between libdevmapper and lvm2tools uses different 118 * names for one IOCTL call because libdevmapper do another thing 119 * then. When I run "info" or "mknodes" libdevmapper will send same 120 * ioctl to kernel but will do another things in userspace. 121 * 122 */ 123 struct cmd_function cmd_fn[] = { 124 { .cmd = "version", .fn = dm_get_version_ioctl}, 125 { .cmd = "targets", .fn = dm_list_versions_ioctl}, 126 { .cmd = "create", .fn = dm_dev_create_ioctl}, 127 { .cmd = "info", .fn = dm_dev_status_ioctl}, 128 { .cmd = "mknodes", .fn = dm_dev_status_ioctl}, 129 { .cmd = "names", .fn = dm_dev_list_ioctl}, 130 { .cmd = "suspend", .fn = dm_dev_suspend_ioctl}, 131 { .cmd = "remove", .fn = dm_dev_remove_ioctl}, 132 { .cmd = "rename", .fn = dm_dev_rename_ioctl}, 133 { .cmd = "resume", .fn = dm_dev_resume_ioctl}, 134 { .cmd = "clear", .fn = dm_table_clear_ioctl}, 135 { .cmd = "deps", .fn = dm_table_deps_ioctl}, 136 { .cmd = "reload", .fn = dm_table_load_ioctl}, 137 { .cmd = "status", .fn = dm_table_status_ioctl}, 138 { .cmd = "table", .fn = dm_table_status_ioctl}, 139 {NULL, NULL} 140 }; 141 142 MODULE(MODULE_CLASS_DRIVER, dm, NULL); 143 144 /* New module handle routine */ 145 static int 146 dm_modcmd(modcmd_t cmd, void *arg) 147 { 148 #ifdef _MODULE 149 int bmajor = -1, cmajor = -1; 150 int error; 151 152 error = 0; 153 154 switch (cmd) { 155 case MODULE_CMD_INIT: 156 dmattach(); 157 158 error = config_cfdriver_attach(&dm_cd); 159 if (error) 160 break; 161 162 error = config_cfattach_attach(dm_cd.cd_name, &dm_ca); 163 if (error) { 164 config_cfdriver_detach(&dm_cd); 165 aprint_error("Unable to register cfattach for dm driver\n"); 166 167 break; 168 } 169 170 error = devsw_attach("dm", &dm_bdevsw, &bmajor, 171 &dm_cdevsw, &cmajor); 172 break; 173 174 case MODULE_CMD_FINI: 175 /* 176 * Disable unloading of dm module if there are any devices 177 * defined in driver. This is probably too strong we need 178 * to disable auto-unload only if there is mounted dm device 179 * present. 180 */ 181 if (dev_counter > 0) 182 return EBUSY; 183 dmdestroy(); 184 185 error = config_cfattach_detach(dm_cd.cd_name, &dm_ca); 186 if (error) 187 break; 188 189 config_cfdriver_detach(&dm_cd); 190 191 devsw_detach(&dm_bdevsw, &dm_cdevsw); 192 break; 193 case MODULE_CMD_STAT: 194 return ENOTTY; 195 196 default: 197 return ENOTTY; 198 } 199 200 return error; 201 #else 202 203 if (cmd == MODULE_CMD_INIT) 204 return 0; 205 return ENOTTY; 206 207 #endif /* _MODULE */ 208 } 209 210 211 /* 212 * dm_match: 213 * 214 * Autoconfiguration match function for pseudo-device glue. 215 */ 216 static int 217 dm_match(device_t parent, cfdata_t match, 218 void *aux) 219 { 220 221 /* Pseudo-device; always present. */ 222 return (1); 223 } 224 225 /* 226 * dm_attach: 227 * 228 * Autoconfiguration attach function for pseudo-device glue. 229 */ 230 static void 231 dm_attach(device_t parent, device_t self, 232 void *aux) 233 { 234 return; 235 } 236 237 238 /* 239 * dm_detach: 240 * 241 * Autoconfiguration detach function for pseudo-device glue. 242 * This routine is called by dm_ioctl::dm_dev_remove_ioctl and by autoconf to 243 * remove devices created in device-mapper. 244 */ 245 static int 246 dm_detach(device_t self, int flags) 247 { 248 dm_dev_t *dmv; 249 250 /* Detach device from global device list */ 251 if ((dmv = dm_dev_detach(self)) == NULL) 252 return ENOENT; 253 254 /* Destroy active table first. */ 255 dm_table_destroy(&dmv->table_head, DM_TABLE_ACTIVE); 256 257 /* Destroy inactive table if exits, too. */ 258 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 259 260 dm_table_head_destroy(&dmv->table_head); 261 262 /* Destroy disk device structure */ 263 disk_detach(dmv->diskp); 264 disk_destroy(dmv->diskp); 265 266 /* Destroy device */ 267 (void)dm_dev_free(dmv); 268 269 /* Decrement device counter After removing device */ 270 atomic_dec_64(&dev_counter); 271 272 return 0; 273 } 274 275 /* attach routine */ 276 static int 277 dmattach(void) 278 { 279 280 dm_target_init(); 281 dm_dev_init(); 282 dm_pdev_init(); 283 284 return 0; 285 } 286 287 /* Destroy routine */ 288 static int 289 dmdestroy(void) 290 { 291 292 dm_dev_destroy(); 293 dm_pdev_destroy(); 294 dm_target_destroy(); 295 296 return 0; 297 } 298 299 static int 300 dmopen(dev_t dev, int flags, int mode, struct lwp *l) 301 { 302 303 aprint_debug("dm open routine called %" PRIu32 "\n", minor(dev)); 304 return 0; 305 } 306 307 static int 308 dmclose(dev_t dev, int flags, int mode, struct lwp *l) 309 { 310 311 aprint_debug("dm close routine called %" PRIu32 "\n", minor(dev)); 312 return 0; 313 } 314 315 316 static int 317 dmioctl(dev_t dev, const u_long cmd, void *data, int flag, struct lwp *l) 318 { 319 int r; 320 prop_dictionary_t dm_dict_in; 321 322 r = 0; 323 324 aprint_debug("dmioctl called\n"); 325 326 KASSERT(data != NULL); 327 328 if (( r = disk_ioctl_switch(dev, cmd, data)) == ENOTTY) { 329 struct plistref *pref = (struct plistref *) data; 330 331 /* Check if we were called with NETBSD_DM_IOCTL ioctl 332 otherwise quit. */ 333 if ((r = dm_ioctl_switch(cmd)) != 0) 334 return r; 335 336 if((r = prop_dictionary_copyin_ioctl(pref, cmd, &dm_dict_in)) != 0) 337 return r; 338 339 if ((r = dm_check_version(dm_dict_in)) != 0) 340 goto cleanup_exit; 341 342 /* run ioctl routine */ 343 if ((r = dm_cmd_to_fun(dm_dict_in)) != 0) 344 goto cleanup_exit; 345 346 cleanup_exit: 347 r = prop_dictionary_copyout_ioctl(pref, cmd, dm_dict_in); 348 prop_object_release(dm_dict_in); 349 } 350 351 return r; 352 } 353 354 /* 355 * Translate command sent from libdevmapper to func. 356 */ 357 static int 358 dm_cmd_to_fun(prop_dictionary_t dm_dict){ 359 int i, r; 360 prop_string_t command; 361 362 r = 0; 363 364 if ((command = prop_dictionary_get(dm_dict, DM_IOCTL_COMMAND)) == NULL) 365 return EINVAL; 366 367 for(i = 0; cmd_fn[i].cmd != NULL; i++) 368 if (prop_string_equals_cstring(command, cmd_fn[i].cmd)) 369 break; 370 371 if (cmd_fn[i].cmd == NULL) 372 return EINVAL; 373 374 aprint_debug("ioctl %s called\n", cmd_fn[i].cmd); 375 r = cmd_fn[i].fn(dm_dict); 376 377 return r; 378 } 379 380 /* Call apropriate ioctl handler function. */ 381 static int 382 dm_ioctl_switch(u_long cmd) 383 { 384 385 switch(cmd) { 386 387 case NETBSD_DM_IOCTL: 388 aprint_debug("dm NetBSD_DM_IOCTL called\n"); 389 break; 390 default: 391 aprint_debug("dm unknown ioctl called\n"); 392 return ENOTTY; 393 break; /* NOT REACHED */ 394 } 395 396 return 0; 397 } 398 399 /* 400 * Check for disk specific ioctls. 401 */ 402 403 static int 404 disk_ioctl_switch(dev_t dev, u_long cmd, void *data) 405 { 406 dm_dev_t *dmv; 407 408 switch(cmd) { 409 case DIOCGWEDGEINFO: 410 { 411 struct dkwedge_info *dkw = (void *) data; 412 413 if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) 414 return ENODEV; 415 416 aprint_debug("DIOCGWEDGEINFO ioctl called\n"); 417 418 strlcpy(dkw->dkw_devname, dmv->name, 16); 419 strlcpy(dkw->dkw_wname, dmv->name, DM_NAME_LEN); 420 strlcpy(dkw->dkw_parent, dmv->name, 16); 421 422 dkw->dkw_offset = 0; 423 dkw->dkw_size = dm_table_size(&dmv->table_head); 424 strcpy(dkw->dkw_ptype, DKW_PTYPE_FFS); 425 426 dm_dev_unbusy(dmv); 427 break; 428 } 429 430 case DIOCGDISKINFO: 431 { 432 struct plistref *pref = (struct plistref *) data; 433 434 if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) 435 return ENODEV; 436 437 if (dmv->diskp->dk_info == NULL) { 438 dm_dev_unbusy(dmv); 439 return ENOTSUP; 440 } else 441 prop_dictionary_copyout_ioctl(pref, cmd, 442 dmv->diskp->dk_info); 443 444 dm_dev_unbusy(dmv); 445 break; 446 } 447 448 default: 449 aprint_debug("unknown disk_ioctl called\n"); 450 return ENOTTY; 451 break; /* NOT REACHED */ 452 } 453 454 return 0; 455 } 456 457 /* 458 * Do all IO operations on dm logical devices. 459 */ 460 static void 461 dmstrategy(struct buf *bp) 462 { 463 dm_dev_t *dmv; 464 dm_table_t *tbl; 465 dm_table_entry_t *table_en; 466 struct buf *nestbuf; 467 468 uint32_t dev_type; 469 470 uint64_t buf_start, buf_len, issued_len; 471 uint64_t table_start, table_end; 472 uint64_t start, end; 473 474 buf_start = bp->b_blkno * DEV_BSIZE; 475 buf_len = bp->b_bcount; 476 477 tbl = NULL; 478 479 table_end = 0; 480 dev_type = 0; 481 issued_len = 0; 482 483 if ((dmv = dm_dev_lookup(NULL, NULL, minor(bp->b_dev))) == NULL) { 484 bp->b_error = EIO; 485 bp->b_resid = bp->b_bcount; 486 biodone(bp); 487 return; 488 } 489 490 if (bounds_check_with_mediasize(bp, DEV_BSIZE, 491 dm_table_size(&dmv->table_head)) <= 0) { 492 dm_dev_unbusy(dmv); 493 bp->b_resid = bp->b_bcount; 494 biodone(bp); 495 return; 496 } 497 498 /* 499 * disk(9) is part of device structure and it can't be used without 500 * mutual exclusion, use diskp_mtx until it will be fixed. 501 */ 502 mutex_enter(&dmv->diskp_mtx); 503 disk_busy(dmv->diskp); 504 mutex_exit(&dmv->diskp_mtx); 505 506 /* Select active table */ 507 tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_ACTIVE); 508 509 /* Nested buffers count down to zero therefore I have 510 to set bp->b_resid to maximal value. */ 511 bp->b_resid = bp->b_bcount; 512 513 /* 514 * Find out what tables I want to select. 515 */ 516 SLIST_FOREACH(table_en, tbl, next) 517 { 518 /* I need need number of bytes not blocks. */ 519 table_start = table_en->start * DEV_BSIZE; 520 /* 521 * I have to sub 1 from table_en->length to prevent 522 * off by one error 523 */ 524 table_end = table_start + (table_en->length)* DEV_BSIZE; 525 526 start = MAX(table_start, buf_start); 527 528 end = MIN(table_end, buf_start + buf_len); 529 530 aprint_debug("----------------------------------------\n"); 531 aprint_debug("table_start %010" PRIu64", table_end %010" 532 PRIu64 "\n", table_start, table_end); 533 aprint_debug("buf_start %010" PRIu64", buf_len %010" 534 PRIu64"\n", buf_start, buf_len); 535 aprint_debug("start-buf_start %010"PRIu64", end %010" 536 PRIu64"\n", start - buf_start, end); 537 aprint_debug("start %010" PRIu64" , end %010" 538 PRIu64"\n", start, end); 539 aprint_debug("\n----------------------------------------\n"); 540 541 if (start < end) { 542 /* create nested buffer */ 543 nestbuf = getiobuf(NULL, true); 544 545 nestiobuf_setup(bp, nestbuf, start - buf_start, 546 (end - start)); 547 548 issued_len += end - start; 549 550 /* I need number of blocks. */ 551 nestbuf->b_blkno = (start - table_start) / DEV_BSIZE; 552 553 table_en->target->strategy(table_en, nestbuf); 554 } 555 } 556 557 if (issued_len < buf_len) 558 nestiobuf_done(bp, buf_len - issued_len, EINVAL); 559 560 mutex_enter(&dmv->diskp_mtx); 561 disk_unbusy(dmv->diskp, buf_len, bp != NULL ? bp->b_flags & B_READ : 0); 562 mutex_exit(&dmv->diskp_mtx); 563 564 dm_table_release(&dmv->table_head, DM_TABLE_ACTIVE); 565 dm_dev_unbusy(dmv); 566 567 return; 568 } 569 570 571 static int 572 dmread(dev_t dev, struct uio *uio, int flag) 573 { 574 575 return (physio(dmstrategy, NULL, dev, B_READ, dmminphys, uio)); 576 } 577 578 static int 579 dmwrite(dev_t dev, struct uio *uio, int flag) 580 { 581 582 return (physio(dmstrategy, NULL, dev, B_WRITE, dmminphys, uio)); 583 } 584 585 static int 586 dmsize(dev_t dev) 587 { 588 dm_dev_t *dmv; 589 uint64_t size; 590 591 size = 0; 592 593 if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) 594 return -ENOENT; 595 596 size = dm_table_size(&dmv->table_head); 597 dm_dev_unbusy(dmv); 598 599 return size; 600 } 601 602 static void 603 dmminphys(struct buf *bp) 604 { 605 606 bp->b_bcount = MIN(bp->b_bcount, MAXPHYS); 607 } 608 609 void 610 dmgetproperties(struct disk *disk, dm_table_head_t *head) 611 { 612 prop_dictionary_t disk_info, odisk_info, geom; 613 int dmp_size; 614 615 dmp_size = dm_table_size(head); 616 disk_info = prop_dictionary_create(); 617 geom = prop_dictionary_create(); 618 619 prop_dictionary_set_cstring_nocopy(disk_info, "type", "ESDI"); 620 prop_dictionary_set_uint64(geom, "sectors-per-unit", dmp_size); 621 prop_dictionary_set_uint32(geom, "sector-size", 622 DEV_BSIZE /* XXX 512? */); 623 prop_dictionary_set_uint32(geom, "sectors-per-track", 32); 624 prop_dictionary_set_uint32(geom, "tracks-per-cylinder", 64); 625 prop_dictionary_set_uint32(geom, "cylinders-per-unit", dmp_size / 2048); 626 prop_dictionary_set(disk_info, "geometry", geom); 627 prop_object_release(geom); 628 629 odisk_info = disk->dk_info; 630 disk->dk_info = disk_info; 631 632 if (odisk_info != NULL) 633 prop_object_release(odisk_info); 634 } 635
Indexes created Thu Sep 25 06:09:39 GMT 2025