1/* $NetBSD: libdm-nbsd-iface.c,v 1.10 2011/01/12 08:16:23 haad Exp $ */ 2 3/* 4 * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved. 5 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved. 6 * Copyright (C) 2008 Adam Hamsik. All rights reserved. 7 * 8 * This file is part of the device-mapper userspace tools. 9 * 10 * This copyrighted material is made available to anyone wishing to use, 11 * modify, copy, or redistribute it subject to the terms and conditions 12 * of the GNU Lesser General Public License v.2.1. 13 * 14 * You should have received a copy of the GNU Lesser General Public License 15 * along with this program; if not, write to the Free Software Foundation, 16 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17 */ 18 19#include "dmlib.h" 20#include "libdm-targets.h" 21#include "libdm-common.h" 22#include "libdm-netbsd.h" 23 24#include <sys/ioctl.h> 25#include <sys/sysctl.h> 26 27#include <fcntl.h> 28#include <dirent.h> 29#include <limits.h> 30 31#include <dm.h> 32#include <dev/dm/netbsd-dm.h> 33 34#include <dm-ioctl.h> 35 36#ifdef RUMP_ACTION 37#include <rump/rump.h> 38#include <rump/rump_syscalls.h> 39#endif 40 41/* 42 * Ensure build compatibility. 43 * The hard-coded versions here are the highest present 44 * in the _cmd_data arrays. 45 */ 46 47#if !((DM_VERSION_MAJOR == 1 && DM_VERSION_MINOR >= 0) || \ 48 (DM_VERSION_MAJOR == 4 && DM_VERSION_MINOR >= 0)) 49#error The version of dm-ioctl.h included is incompatible. 50#endif 51 52/* dm major version no for running kernel */ 53static unsigned _dm_version_minor = 0; 54static unsigned _dm_version_patchlevel = 0; 55 56static int _control_fd = -1; 57static int _version_checked = 0; 58static int _version_ok = 1; 59static unsigned _ioctl_buffer_double_factor = 0; 60 61/* *INDENT-OFF* */ 62 63/* 64 * XXX Remove this structure and write another own one 65 * I don't understand why ioctl calls has different 66 * names then dm task type 67 */ 68static struct cmd_data _cmd_data_v4[] = { 69 {"create", DM_DEV_CREATE, {4, 0, 0}}, 70 {"reload", DM_TABLE_LOAD, {4, 0, 0}}, /* DM_DEVICE_RELOAD */ 71 {"remove", DM_DEV_REMOVE, {4, 0, 0}}, 72 {"remove_all", DM_REMOVE_ALL, {4, 0, 0}}, 73 {"suspend", DM_DEV_SUSPEND, {4, 0, 0}}, 74 {"resume", DM_DEV_SUSPEND, {4, 0, 0}}, 75 {"info", DM_DEV_STATUS, {4, 0, 0}}, 76 {"deps", DM_TABLE_DEPS, {4, 0, 0}}, /* DM_DEVICE_DEPS */ 77 {"rename", DM_DEV_RENAME, {4, 0, 0}}, 78 {"version", DM_VERSION, {4, 0, 0}}, 79 {"status", DM_TABLE_STATUS, {4, 0, 0}}, 80 {"table", DM_TABLE_STATUS, {4, 0, 0}}, /* DM_DEVICE_TABLE */ 81 {"waitevent", DM_DEV_WAIT, {4, 0, 0}}, 82 {"names", DM_LIST_DEVICES, {4, 0, 0}}, 83 {"clear", DM_TABLE_CLEAR, {4, 0, 0}}, 84 {"mknodes", DM_DEV_STATUS, {4, 0, 0}}, 85#ifdef DM_LIST_VERSIONS 86 {"targets", DM_LIST_VERSIONS, {4, 1, 0}}, 87#endif 88#ifdef DM_TARGET_MSG 89 {"message", DM_TARGET_MSG, {4, 2, 0}}, 90#endif 91#ifdef DM_DEV_SET_GEOMETRY 92 {"setgeometry", DM_DEV_SET_GEOMETRY, {4, 6, 0}}, 93#endif 94}; 95/* *INDENT-ON* */ 96 97/* 98 * In NetBSD we use sysctl to get kernel drivers info. control device 99 * has predefined minor number 0 and major number = char major number 100 * of dm driver. First slot is therefore ocupied with control device 101 * and minor device starts from 1; 102 */ 103 104static int _control_device_number(uint32_t *major, uint32_t *minor) 105{ 106 107 nbsd_get_dm_major(major, DM_CHAR_MAJOR); 108 109 *minor = 0; 110 111 return 1; 112} 113 114/* 115 * Returns 1 if exists; 0 if it doesn't; -1 if it's wrong 116 */ 117static int _control_exists(const char *control, uint32_t major, uint32_t minor) 118{ 119 struct stat buf; 120 121 if (stat(control, &buf) < 0) { 122 if (errno != ENOENT) 123 log_sys_error("stat", control); 124 return 0; 125 } 126 127 if (!S_ISCHR(buf.st_mode)) { 128 log_verbose("%s: Wrong inode type", control); 129 if (!unlink(control)) 130 return 0; 131 log_sys_error("unlink", control); 132 return -1; 133 } 134 135 if (major && buf.st_rdev != MKDEV(major, minor)) { 136 log_verbose("%s: Wrong device number: (%u, %u) instead of " 137 "(%u, %u)", control, 138 MAJOR(buf.st_mode), MINOR(buf.st_mode), 139 major, minor); 140 if (!unlink(control)) 141 return 0; 142 log_sys_error("unlink", control); 143 return -1; 144 } 145 146 return 1; 147} 148 149static int _create_control(const char *control, uint32_t major, uint32_t minor) 150{ 151 int ret; 152 mode_t old_umask; 153 154 if (!major) 155 return 0; 156 157 old_umask = umask(DM_DEV_DIR_UMASK); 158 ret = dm_create_dir(dm_dir()); 159 umask(old_umask); 160 161 if (!ret) 162 return 0; 163 164 log_verbose("Creating device %s (%u, %u)", control, major, minor); 165 166 old_umask = umask(0); 167 if (mknod(control, S_IFCHR | DM_CONTROL_DEVICE_MODE, 168 MKDEV(major, minor)) < 0) { 169 umask(old_umask); 170 log_sys_error("mknod", control); 171 return 0; 172 } 173 umask(old_umask); 174 if (chown(control, DM_DEVICE_UID, DM_DEVICE_GID) == -1) { 175 log_sys_error("chown", control); 176 return 0; 177 } 178 179 180 return 1; 181} 182 183/* Check if major is device-mapper block device major number */ 184int dm_is_dm_major(uint32_t major) 185{ 186 uint32_t dm_major; 187 188 nbsd_get_dm_major(&dm_major, DM_BLOCK_MAJOR); 189 190 if (major == dm_major) 191 return 1; 192 193 return 0; 194} 195 196/* Open control device if doesn't exist create it. */ 197static int _open_control(void) 198{ 199 char control[PATH_MAX]; 200 uint32_t major = 0, minor = 0; 201 202 if (_control_fd != -1) 203 return 1; 204 205#ifdef RUMP_ACTION 206 rump_init(); 207#endif 208 snprintf(control, sizeof(control), "%s/control", dm_dir()); 209 210 if (!_control_device_number(&major, &minor)) 211 log_error("Is device-mapper driver missing from kernel?"); 212 213 if (!_control_exists(control, major, minor) && 214 !_create_control(control, major, minor)) 215 goto error; 216 217 if ((_control_fd = open(control, O_RDWR)) < 0) { 218 log_sys_error("open", control); 219 goto error; 220 } 221 222 return 1; 223 224error: 225 log_error("Failure to communicate with kernel device-mapper driver."); 226 return 0; 227} 228 229/* 230 * Destroy dm task structure there are some dynamically alocated values there. 231 * name, uuid, head, tail list. 232 */ 233void dm_task_destroy(struct dm_task *dmt) 234{ 235 struct target *t, *n; 236 237 for (t = dmt->head; t; t = n) { 238 n = t->next; 239 dm_free(t->params); 240 dm_free(t->type); 241 dm_free(t); 242 } 243 244 if (dmt->dev_name) 245 dm_free(dmt->dev_name); 246 247 if (dmt->newname) 248 dm_free(dmt->newname); 249 250 if (dmt->message) 251 dm_free(dmt->message); 252 253 if (dmt->dmi.v4) 254 dm_free(dmt->dmi.v4); 255 256 if (dmt->uuid) 257 dm_free(dmt->uuid); 258 259 dm_free(dmt); 260 261} 262 263/* Get kernel driver version from dm_ioctl structure. */ 264int dm_task_get_driver_version(struct dm_task *dmt, char *version, size_t size) 265{ 266 unsigned *v; 267 268 if (!dmt->dmi.v4) { 269 version[0] = '\0'; 270 return 0; 271 } 272 273 v = dmt->dmi.v4->version; 274 snprintf(version, size, "%u.%u.%u", v[0], v[1], v[2]); 275 _dm_version_minor = v[1]; 276 _dm_version_patchlevel = v[2]; 277 278 return 1; 279} 280 281/* Get kernel driver protocol version and comapre it with library version. */ 282static int _check_version(char *version, size_t size) 283{ 284 struct dm_task *task; 285 int r; 286 287 if (!(task = dm_task_create(DM_DEVICE_VERSION))) { 288 log_error("Failed to get device-mapper version"); 289 version[0] = '\0'; 290 return 0; 291 } 292 293 r = dm_task_run(task); 294 dm_task_get_driver_version(task, version, size); 295 dm_task_destroy(task); 296 297 return r; 298} 299 300/* 301 * Find out device-mapper's major version number the first time 302 * this is called and whether or not we support it. 303 */ 304int dm_check_version(void) 305{ 306 char dmversion[64]; 307 308 if (_version_checked) 309 return _version_ok; 310 311 _version_checked = 1; 312 313 if (_check_version(dmversion, sizeof(dmversion))) 314 return 1; 315 316 317 return 0; 318} 319 320int dm_cookie_supported(void) 321{ 322 return (0); 323} 324 325/* Get next target(table description) from list pointed by dmt->head. */ 326void *dm_get_next_target(struct dm_task *dmt, void *next, 327 uint64_t *start, uint64_t *length, 328 char **target_type, char **params) 329{ 330 struct target *t = (struct target *) next; 331 332 if (!t) 333 t = dmt->head; 334 335 if (!t) 336 return NULL; 337 338 *start = t->start; 339 *length = t->length; 340 *target_type = t->type; 341 *params = t->params; 342 343 return t->next; 344} 345 346/* Unmarshall the target info returned from a status call */ 347static int _unmarshal_status(struct dm_task *dmt, struct dm_ioctl *dmi) 348{ 349 char *outbuf = (char *) dmi + dmi->data_start; 350 char *outptr = outbuf; 351 uint32_t i; 352 struct dm_target_spec *spec; 353 354 for (i = 0; i < dmi->target_count; i++) { 355 spec = (struct dm_target_spec *) outptr; 356 if (!dm_task_add_target(dmt, spec->sector_start, 357 spec->length, 358 spec->target_type, 359 outptr + sizeof(*spec))) { 360 return 0; 361 } 362 363 outptr = outbuf + spec->next; 364 } 365 366 return 1; 367} 368 369static char * 370get_dev_name(char *d_name, uint32_t d_major, uint32_t d_minor) 371{ 372 static char d_buf[MAXPATHLEN]; 373 struct dirent *dire; 374 struct stat st; 375 DIR *dev_dir; 376 377 int err; 378 char *name; 379 380 dev_dir = opendir("/dev"); 381 382 while ((dire = readdir(dev_dir)) != NULL) { 383 384 if (strstr(dire->d_name, d_name) == NULL) 385 continue; 386 387 snprintf(d_buf, MAXPATHLEN, "/dev/%s", dire->d_name); 388 389 if ((err = stat(d_buf, &st)) < 0) 390 printf("stat failed with %d", err); 391 392 if (st.st_mode & S_IFBLK){ 393 if ((major(st.st_rdev) == d_major) && (minor(st.st_rdev) == d_minor)) { 394 strncpy(d_buf, dire->d_name, strlen(dire->d_name) + 1); 395 name = d_buf; 396 break; 397 } 398 } 399 400 memset(d_buf, '0', sizeof(d_buf)); 401 } 402 403 (void)closedir(dev_dir); 404 405 return name; 406} 407 408/* 409 * @dev_major is major number of char device 410 * 411 * I have to find it's block device number and lookup dev in 412 * device database to find device path. 413 * 414 */ 415 416int dm_format_dev(char *buf, int bufsize, uint32_t dev_major, 417 uint32_t dev_minor) 418{ 419 int r; 420 uint32_t major, dm_major; 421 char *name; 422 mode_t mode; 423 dev_t dev; 424 size_t val_len,i; 425 struct kinfo_drivers *kd; 426 427 mode = 0; 428 429 nbsd_get_dm_major(&dm_major, DM_BLOCK_MAJOR); 430 431 if (bufsize < 8) 432 return 0; 433 434 if (sysctlbyname("kern.drivers",NULL,&val_len,NULL,0) < 0) { 435 printf("sysctlbyname failed"); 436 return 0; 437 } 438 439 if ((kd = malloc (val_len)) == NULL){ 440 printf("malloc kd info error\n"); 441 return 0; 442 } 443 444 if (sysctlbyname("kern.drivers", kd, &val_len, NULL, 0) < 0) { 445 printf("sysctlbyname failed kd"); 446 return 0; 447 } 448 449 for (i = 0, val_len /= sizeof(*kd); i < val_len; i++){ 450 if (kd[i].d_cmajor == dev_major) { 451 major = kd[i].d_bmajor; 452 break; 453 } 454 } 455 456 dev = MKDEV(major,dev_minor); 457 458 mode |= S_IFBLK; 459 460 if ((name = devname(dev,mode)) == NULL) 461 name = get_dev_name(kd[i].d_name, major, dev_minor); 462 463 r = snprintf(buf, (size_t) bufsize, "/dev/%s",name); 464 465 free(kd); 466 467 if (r < 0 || r > bufsize - 1 || name == NULL) 468 return 0; 469 470 return 1; 471} 472 473/* Fill info from dm_ioctl structure. Look at DM_EXISTS_FLAG*/ 474int dm_task_get_info(struct dm_task *dmt, struct dm_info *info) 475{ 476 if (!dmt->dmi.v4) 477 return 0; 478 479 memset(info, 0, sizeof(*info)); 480 481 info->exists = dmt->dmi.v4->flags & DM_EXISTS_FLAG ? 1 : 0; 482 if (!info->exists) 483 return 1; 484 485 info->suspended = dmt->dmi.v4->flags & DM_SUSPEND_FLAG ? 1 : 0; 486 info->read_only = dmt->dmi.v4->flags & DM_READONLY_FLAG ? 1 : 0; 487 info->live_table = dmt->dmi.v4->flags & DM_ACTIVE_PRESENT_FLAG ? 1 : 0; 488 info->inactive_table = dmt->dmi.v4->flags & DM_INACTIVE_PRESENT_FLAG ? 489 1 : 0; 490 info->target_count = dmt->dmi.v4->target_count; 491 info->open_count = dmt->dmi.v4->open_count; 492 info->event_nr = dmt->dmi.v4->event_nr; 493 494 nbsd_get_dm_major(&info->major, DM_BLOCK_MAJOR); /* get netbsd dm device major number */ 495 info->minor = MINOR(dmt->dmi.v4->dev); 496 497 return 1; 498} 499 500/* Unsupported on NetBSD */ 501uint32_t dm_task_get_read_ahead(const struct dm_task *dmt, uint32_t *read_ahead) 502{ 503 *read_ahead = DM_READ_AHEAD_NONE; 504 return 1; 505} 506 507const char *dm_task_get_name(const struct dm_task *dmt) 508{ 509 510 return (dmt->dmi.v4->name); 511} 512 513const char *dm_task_get_uuid(const struct dm_task *dmt) 514{ 515 516 return (dmt->dmi.v4->uuid); 517} 518 519struct dm_deps *dm_task_get_deps(struct dm_task *dmt) 520{ 521 return (struct dm_deps *) (((void *) dmt->dmi.v4) + 522 dmt->dmi.v4->data_start); 523} 524 525struct dm_names *dm_task_get_names(struct dm_task *dmt) 526{ 527 return (struct dm_names *) (((void *) dmt->dmi.v4) + 528 dmt->dmi.v4->data_start); 529} 530 531struct dm_versions *dm_task_get_versions(struct dm_task *dmt) 532{ 533 return (struct dm_versions *) (((void *) dmt->dmi.v4) + 534 dmt->dmi.v4->data_start); 535} 536 537int dm_task_set_ro(struct dm_task *dmt) 538{ 539 dmt->read_only = 1; 540 return 1; 541} 542 543/* Unsupported on NetBSD */ 544int dm_task_set_read_ahead(struct dm_task *dmt, uint32_t read_ahead, 545 uint32_t read_ahead_flags) 546{ 547 return 1; 548} 549 550int dm_task_suppress_identical_reload(struct dm_task *dmt) 551{ 552 dmt->suppress_identical_reload = 1; 553 return 1; 554} 555 556int dm_task_set_newname(struct dm_task *dmt, const char *newname) 557{ 558 if (!(dmt->newname = dm_strdup(newname))) { 559 log_error("dm_task_set_newname: strdup(%s) failed", newname); 560 return 0; 561 } 562 563 return 1; 564} 565 566int dm_task_set_message(struct dm_task *dmt, const char *message) 567{ 568 if (!(dmt->message = dm_strdup(message))) { 569 log_error("dm_task_set_message: strdup(%s) failed", message); 570 return 0; 571 } 572 573 return 1; 574} 575 576int dm_task_set_sector(struct dm_task *dmt, uint64_t sector) 577{ 578 dmt->sector = sector; 579 580 return 1; 581} 582 583/* Unsupported in NetBSD */ 584int dm_task_set_geometry(struct dm_task *dmt, const char *cylinders, 585 const char *heads, const char *sectors, const char *start) 586{ 587 return 0; 588} 589 590int dm_task_no_flush(struct dm_task *dmt) 591{ 592 dmt->no_flush = 1; 593 594 return 1; 595} 596 597int dm_task_no_open_count(struct dm_task *dmt) 598{ 599 dmt->no_open_count = 1; 600 601 return 1; 602} 603 604int dm_task_skip_lockfs(struct dm_task *dmt) 605{ 606 dmt->skip_lockfs = 1; 607 608 return 1; 609} 610 611int dm_task_query_inactive_table(struct dm_task *dmt) 612{ 613 dmt->query_inactive_table = 1; 614 615 return 1; 616} 617 618int dm_task_set_event_nr(struct dm_task *dmt, uint32_t event_nr) 619{ 620 dmt->event_nr = event_nr; 621 622 return 1; 623} 624 625/* Allocate one target(table description) entry. */ 626struct target *create_target(uint64_t start, uint64_t len, const char *type, 627 const char *params) 628{ 629 struct target *t = dm_malloc(sizeof(*t)); 630 631 if (!t) { 632 log_error("create_target: malloc(%" PRIsize_t ") failed", 633 sizeof(*t)); 634 return NULL; 635 } 636 637 memset(t, 0, sizeof(*t)); 638 639 if (!(t->params = dm_strdup(params))) { 640 log_error("create_target: strdup(params) failed"); 641 goto bad; 642 } 643 644 if (!(t->type = dm_strdup(type))) { 645 log_error("create_target: strdup(type) failed"); 646 goto bad; 647 } 648 649 t->start = start; 650 t->length = len; 651 return t; 652 653 bad: 654 dm_free(t->params); 655 dm_free(t->type); 656 dm_free(t); 657 return NULL; 658} 659 660/* Parse given dm task structure to proplib dictionary. */ 661static int _flatten(struct dm_task *dmt, libdm_task_t task) 662{ 663 libdm_cmd_t cmd; 664 libdm_table_t table; 665 666 struct target *t; 667 668 size_t len; 669 char type[DM_MAX_TYPE_NAME]; 670 671 uint32_t major, flags; 672 int count = 0; 673 674 flags = 0; 675 676 cmd = libdm_cmd_create(); 677 678 for (t = dmt->head; t; t = t->next) { 679 strlcpy(type,t->type,DM_MAX_TYPE_NAME); 680 681 table = libdm_table_create(); 682 683 libdm_table_set_start(t->start, table); 684 libdm_table_set_length(t->length, table); 685 libdm_table_set_target(type, table); 686 libdm_table_set_params(t->params, table); 687 libdm_cmd_set_table(table, cmd); 688 689 libdm_table_destroy(table); 690 691 count++; 692 } 693 694 if (count && (dmt->sector || dmt->message)) { 695 log_error("targets and message are incompatible"); 696 return -1; 697 } 698 699 if (count && dmt->newname) { 700 log_error("targets and newname are incompatible"); 701 return -1; 702 } 703 704 if (count && dmt->geometry) { 705 log_error("targets and geometry are incompatible"); 706 return -1; 707 } 708 709 if (dmt->newname && (dmt->sector || dmt->message)) { 710 log_error("message and newname are incompatible"); 711 return -1; 712 } 713 714 if (dmt->newname && dmt->geometry) { 715 log_error("geometry and newname are incompatible"); 716 return -1; 717 } 718 719 if (dmt->geometry && (dmt->sector || dmt->message)) { 720 log_error("geometry and message are incompatible"); 721 return -1; 722 } 723 724 if (dmt->sector && !dmt->message) { 725 log_error("message is required with sector"); 726 return -1; 727 } 728 729 if (dmt->newname) 730 len += strlen(dmt->newname) + 1; 731 732 if (dmt->message) 733 len += sizeof(struct dm_target_msg) + strlen(dmt->message) + 1; 734 735 if (dmt->geometry) 736 len += strlen(dmt->geometry) + 1; 737 738 nbsd_get_dm_major(&major, DM_BLOCK_MAJOR); 739 /* 740 * Only devices with major which is equal to netbsd dm major 741 * dm devices in NetBSD can't have more majors then one assigned to dm. 742 */ 743 if (dmt->major != major && dmt->major != -1) 744 return -1; 745 746 if (dmt->minor >= 0) { 747 flags |= DM_PERSISTENT_DEV_FLAG; 748 libdm_task_set_minor(dmt->minor, task); 749 } 750 751 /* Set values to dictionary. */ 752 if (dmt->dev_name) 753 libdm_task_set_name(dmt->dev_name, task); 754 755 if (dmt->uuid) 756 libdm_task_set_uuid(dmt->uuid, task); 757 758 if (dmt->type == DM_DEVICE_SUSPEND) 759 flags |= DM_SUSPEND_FLAG; 760 if (dmt->no_flush) 761 flags |= DM_NOFLUSH_FLAG; 762 if (dmt->read_only) 763 flags |= DM_READONLY_FLAG; 764 if (dmt->skip_lockfs) 765 flags |= DM_SKIP_LOCKFS_FLAG; 766 767 if (dmt->query_inactive_table) { 768 if (_dm_version_minor < 16) 769 log_warn("WARNING: Inactive table query unsupported " 770 "by kernel. It will use live table."); 771 flags |= DM_QUERY_INACTIVE_TABLE_FLAG; 772 } 773 774 libdm_task_set_flags(task, flags); 775 776// prop_dictionary_set_uint32(dm_dict, DM_IOCTL_EVENT, dmt->event_nr); 777 778 if (dmt->newname) 779 libdm_dev_set_newname(dmt->newname, cmd); 780 781 /* Add array for all COMMAND specific data. */ 782 libdm_task_set_cmd(cmd, task); 783 libdm_cmd_destroy(cmd); 784 785 return 0; 786} 787 788static int _process_mapper_dir(struct dm_task *dmt) 789{ 790 struct dirent *dirent; 791 DIR *d; 792 const char *dir; 793 int r = 1; 794 795 dir = dm_dir(); 796 if (!(d = opendir(dir))) { 797 log_sys_error("opendir", dir); 798 return 0; 799 } 800 801 while ((dirent = readdir(d))) { 802 if (!strcmp(dirent->d_name, ".") || 803 !strcmp(dirent->d_name, "..") || 804 !strcmp(dirent->d_name, "control")) 805 continue; 806 dm_task_set_name(dmt, dirent->d_name); 807 dm_task_run(dmt); 808 } 809 810 if (closedir(d)) 811 log_sys_error("closedir", dir); 812 813 return r; 814} 815 816/* Get list of all devices. */ 817static int _process_all_v4(struct dm_task *dmt) 818{ 819 struct dm_task *task; 820 struct dm_names *names; 821 unsigned next = 0; 822 int r = 1; 823 824 if (!(task = dm_task_create(DM_DEVICE_LIST))) 825 return 0; 826 827 if (!dm_task_run(task)) { 828 r = 0; 829 goto out; 830 } 831 832 if (!(names = dm_task_get_names(task))) { 833 r = 0; 834 goto out; 835 } 836 837 if (!names->dev) 838 goto out; 839 840 do { 841 names = (void *) names + next; 842 if (!dm_task_set_name(dmt, names->name)) { 843 r = 0; 844 goto out; 845 } 846 if (!dm_task_run(dmt)) 847 r = 0; 848 next = names->next; 849 } while (next); 850 851 out: 852 dm_task_destroy(task); 853 return r; 854} 855 856static int _mknodes_v4(struct dm_task *dmt) 857{ 858 (void) _process_mapper_dir(dmt); 859 860 return _process_all_v4(dmt); 861} 862 863/* Create new device and load table to it. */ 864static int _create_and_load_v4(struct dm_task *dmt) 865{ 866 struct dm_task *task; 867 int r; 868 869 printf("create and load called \n"); 870 871 /* Use new task struct to create the device */ 872 if (!(task = dm_task_create(DM_DEVICE_CREATE))) { 873 log_error("Failed to create device-mapper task struct"); 874 return 0; 875 } 876 877 /* Copy across relevant fields */ 878 if (dmt->dev_name && !dm_task_set_name(task, dmt->dev_name)) { 879 dm_task_destroy(task); 880 return 0; 881 } 882 883 if (dmt->uuid && !dm_task_set_uuid(task, dmt->uuid)) { 884 dm_task_destroy(task); 885 return 0; 886 } 887 888 task->major = dmt->major; 889 task->minor = dmt->minor; 890 task->uid = dmt->uid; 891 task->gid = dmt->gid; 892 task->mode = dmt->mode; 893 894 r = dm_task_run(task); 895 dm_task_destroy(task); 896 if (!r) 897 return r; 898 899 /* Next load the table */ 900 if (!(task = dm_task_create(DM_DEVICE_RELOAD))) { 901 log_error("Failed to create device-mapper task struct"); 902 return 0; 903 } 904 905 /* Copy across relevant fields */ 906 if (dmt->dev_name && !dm_task_set_name(task, dmt->dev_name)) { 907 dm_task_destroy(task); 908 return 0; 909 } 910 911 task->read_only = dmt->read_only; 912 task->head = dmt->head; 913 task->tail = dmt->tail; 914 915 r = dm_task_run(task); 916 917 task->head = NULL; 918 task->tail = NULL; 919 dm_task_destroy(task); 920 if (!r) 921 goto revert; 922 923 /* Use the original structure last so the info will be correct */ 924 dmt->type = DM_DEVICE_RESUME; 925 dm_free(dmt->uuid); 926 dmt->uuid = NULL; 927 928 r = dm_task_run(dmt); 929 930 if (r) 931 return r; 932 933 revert: 934 dmt->type = DM_DEVICE_REMOVE; 935 dm_free(dmt->uuid); 936 dmt->uuid = NULL; 937 938 if (!dm_task_run(dmt)) 939 log_error("Failed to revert device creation."); 940 941 return r; 942} 943 944uint64_t dm_task_get_existing_table_size(struct dm_task *dmt) 945{ 946 return dmt->existing_table_size; 947} 948 949static int _reload_with_suppression_v4(struct dm_task *dmt) 950{ 951 struct dm_task *task; 952 struct target *t1, *t2; 953 int r; 954 955 /* New task to get existing table information */ 956 if (!(task = dm_task_create(DM_DEVICE_TABLE))) { 957 log_error("Failed to create device-mapper task struct"); 958 return 0; 959 } 960 961 /* Copy across relevant fields */ 962 if (dmt->dev_name && !dm_task_set_name(task, dmt->dev_name)) { 963 dm_task_destroy(task); 964 return 0; 965 } 966 967 if (dmt->uuid && !dm_task_set_uuid(task, dmt->uuid)) { 968 dm_task_destroy(task); 969 return 0; 970 } 971 972 task->major = dmt->major; 973 task->minor = dmt->minor; 974 975 r = dm_task_run(task); 976 977 if (!r) { 978 dm_task_destroy(task); 979 return r; 980 } 981 982 /* Store existing table size */ 983 t2 = task->head; 984 while (t2 && t2->next) 985 t2 = t2->next; 986 dmt->existing_table_size = t2 ? t2->start + t2->length : 0; 987 988 if ((task->dmi.v4->flags & DM_READONLY_FLAG) ? 1 : 0 != dmt->read_only) 989 goto no_match; 990 991 t1 = dmt->head; 992 t2 = task->head; 993 994 while (t1 && t2) { 995 while (t2->params[strlen(t2->params) - 1] == ' ') 996 t2->params[strlen(t2->params) - 1] = '\0'; 997 if ((t1->start != t2->start) || 998 (t1->length != t2->length) || 999 (strcmp(t1->type, t2->type)) || 1000 (strcmp(t1->params, t2->params))) 1001 goto no_match; 1002 t1 = t1->next; 1003 t2 = t2->next; 1004 } 1005 1006 if (!t1 && !t2) { 1007 dmt->dmi.v4 = task->dmi.v4; 1008 task->dmi.v4 = NULL; 1009 dm_task_destroy(task); 1010 return 1; 1011 } 1012 1013no_match: 1014 dm_task_destroy(task); 1015 1016 /* Now do the original reload */ 1017 dmt->suppress_identical_reload = 0; 1018 r = dm_task_run(dmt); 1019 1020 return r; 1021} 1022 1023/* 1024 * This function is heart of NetBSD libdevmapper-> device-mapper kernel protocol 1025 * It creates proplib_dictionary from dm task structure and sends it to NetBSD 1026 * kernel driver. After succesfull ioctl it create dmi structure from returned 1027 * proplib dictionary. This way I keep number of changes in NetBSD version of 1028 * libdevmapper as small as posible. 1029 */ 1030static struct dm_ioctl *_do_dm_ioctl(struct dm_task *dmt, unsigned command) 1031{ 1032 struct dm_ioctl *dmi; 1033 libdm_task_t task; 1034 1035 task = libdm_task_create(_cmd_data_v4[dmt->type].name); 1036 1037 /* Parse dmi from libdevmapper to dictionary */ 1038 if (_flatten(dmt, task) < 0) 1039 goto bad; 1040 1041 if (dmt->type == DM_DEVICE_TABLE) 1042 libdm_task_set_status_flag(task); 1043 1044 libdm_task_set_exists_flag(task); 1045 1046 log_very_verbose("Ioctl type %s --- flags %d",_cmd_data_v4[dmt->type].name, libdm_task_get_flags(task)); 1047 /* Send dictionary to kernel and wait for reply. */ 1048 if (libdm_task_run(task) != 0) { 1049 if (errno == ENOENT && 1050 ((dmt->type == DM_DEVICE_INFO) || 1051 (dmt->type == DM_DEVICE_MKNODES) || 1052 (dmt->type == DM_DEVICE_STATUS))) { 1053 1054 /* 1055 * Linux version doesn't fail when ENOENT is returned 1056 * for nonexisting device after info, deps, mknodes call. 1057 * It returns dmi sent to kernel with DM_EXISTS_FLAG = 0; 1058 */ 1059 1060 dmi = nbsd_dm_dict_to_dmi(task, _cmd_data_v4[dmt->type].cmd); 1061 1062 libdm_task_del_exists_flag(task); 1063 1064 libdm_task_destroy(task); 1065 1066 goto out; 1067 } else { 1068 log_error("ioctl %s call failed with errno %d\n", 1069 _cmd_data_v4[dmt->type].name, errno); 1070 libdm_task_destroy(task); 1071 goto bad; 1072 } 1073 } 1074 1075 /* Parse kernel dictionary to dmi structure and return it to libdevmapper. */ 1076 dmi = nbsd_dm_dict_to_dmi(task, _cmd_data_v4[dmt->type].cmd); 1077 1078 libdm_task_destroy(task); 1079out: 1080 return dmi; 1081bad: 1082 return NULL; 1083} 1084 1085/* Create new edvice nodes in mapper/ dir. */ 1086void dm_task_update_nodes(void) 1087{ 1088 update_devs(); 1089} 1090 1091/* Run dm command which is descirbed in dm_task structure. */ 1092int dm_task_run(struct dm_task *dmt) 1093{ 1094 struct dm_ioctl *dmi; 1095 unsigned command; 1096 1097 if ((unsigned) dmt->type >= 1098 (sizeof(_cmd_data_v4) / sizeof(*_cmd_data_v4))) { 1099 log_error("Internal error: unknown device-mapper task %d", 1100 dmt->type); 1101 return 0; 1102 } 1103 1104 command = _cmd_data_v4[dmt->type].cmd; 1105 1106 /* Old-style creation had a table supplied */ 1107 if (dmt->type == DM_DEVICE_CREATE && dmt->head) 1108 return _create_and_load_v4(dmt); 1109 1110 if (dmt->type == DM_DEVICE_MKNODES && !dmt->dev_name && 1111 !dmt->uuid && dmt->major <= 0) 1112 return _mknodes_v4(dmt); 1113 1114 if ((dmt->type == DM_DEVICE_RELOAD) && dmt->suppress_identical_reload) 1115 return _reload_with_suppression_v4(dmt); 1116 1117 if (!_open_control()) 1118 return 0; 1119 1120 if (!(dmi = _do_dm_ioctl(dmt, command))) 1121 return 0; 1122 1123 switch (dmt->type) { 1124 case DM_DEVICE_CREATE: 1125 add_dev_node(dmt->dev_name, MAJOR(dmi->dev), MINOR(dmi->dev), 1126 dmt->uid, dmt->gid, dmt->mode, 0); 1127 break; 1128 1129 case DM_DEVICE_REMOVE: 1130 /* FIXME Kernel needs to fill in dmi->name */ 1131 if (dmt->dev_name) 1132 rm_dev_node(dmt->dev_name, 0); 1133 break; 1134 1135 case DM_DEVICE_RENAME: 1136 /* FIXME Kernel needs to fill in dmi->name */ 1137 if (dmt->dev_name) 1138 rename_dev_node(dmt->dev_name, dmt->newname, 0); 1139 break; 1140 1141 case DM_DEVICE_RESUME: 1142 /* FIXME Kernel needs to fill in dmi->name */ 1143 set_dev_node_read_ahead(dmt->dev_name, dmt->read_ahead, 1144 dmt->read_ahead_flags); 1145 break; 1146 1147 case DM_DEVICE_MKNODES: 1148 if (dmi->flags & DM_EXISTS_FLAG) 1149 add_dev_node(dmi->name, MAJOR(dmi->dev), 1150 MINOR(dmi->dev), 1151 dmt->uid, dmt->gid, dmt->mode, 0); 1152 else if (dmt->dev_name) 1153 rm_dev_node(dmt->dev_name, 0); 1154 break; 1155 1156 case DM_DEVICE_STATUS: 1157 case DM_DEVICE_TABLE: 1158 case DM_DEVICE_WAITEVENT: 1159 if (!_unmarshal_status(dmt, dmi)) 1160 goto bad; 1161 break; 1162 } 1163 1164 /* Was structure reused? */ 1165 if (dmt->dmi.v4) 1166 dm_free(dmt->dmi.v4); 1167 1168 dmt->dmi.v4 = dmi; 1169 return 1; 1170 1171 bad: 1172 dm_free(dmi); 1173 return 0; 1174} 1175 1176void dm_lib_release(void) 1177{ 1178 if (_control_fd != -1) { 1179 close(_control_fd); 1180 _control_fd = -1; 1181 } 1182 update_devs(); 1183} 1184 1185void dm_lib_exit(void) 1186{ 1187 dm_lib_release(); 1188 dm_dump_memory(); 1189 _version_ok = 1; 1190 _version_checked = 0; 1191} 1192