1 /* 2 * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws> 3 * 4 * Network Block Device 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; under version 2 of the License. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #include "qemu/osdep.h" 20 #include "qemu-common.h" 21 #include "sysemu/block-backend.h" 22 #include "block/block_int.h" 23 #include "block/nbd.h" 24 #include "qemu/main-loop.h" 25 #include "qemu/sockets.h" 26 #include "qemu/error-report.h" 27 #include "block/snapshot.h" 28 #include "qapi/util.h" 29 #include "qapi/qmp/qstring.h" 30 31 #include <getopt.h> 32 #include <sys/socket.h> 33 #include <netinet/in.h> 34 #include <netinet/tcp.h> 35 #include <arpa/inet.h> 36 #include <libgen.h> 37 #include <pthread.h> 38 39 #define SOCKET_PATH "/var/lock/qemu-nbd-%s" 40 #define QEMU_NBD_OPT_CACHE 1 41 #define QEMU_NBD_OPT_AIO 2 42 #define QEMU_NBD_OPT_DISCARD 3 43 #define QEMU_NBD_OPT_DETECT_ZEROES 4 44 45 static NBDExport *exp; 46 static int verbose; 47 static char *srcpath; 48 static SocketAddress *saddr; 49 static int persistent = 0; 50 static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state; 51 static int shared = 1; 52 static int nb_fds; 53 static int server_fd; 54 55 static void usage(const char *name) 56 { 57 (printf) ( 58 "Usage: %s [OPTIONS] FILE\n" 59 "QEMU Disk Network Block Device Server\n" 60 "\n" 61 " -h, --help display this help and exit\n" 62 " -V, --version output version information and exit\n" 63 "\n" 64 "Connection properties:\n" 65 " -p, --port=PORT port to listen on (default `%d')\n" 66 " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" 67 " -k, --socket=PATH path to the unix socket\n" 68 " (default '"SOCKET_PATH"')\n" 69 " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" 70 " -t, --persistent don't exit on the last connection\n" 71 " -v, --verbose display extra debugging information\n" 72 "\n" 73 "Exposing part of the image:\n" 74 " -o, --offset=OFFSET offset into the image\n" 75 " -P, --partition=NUM only expose partition NUM\n" 76 "\n" 77 #ifdef __linux__ 78 "Kernel NBD client support:\n" 79 " -c, --connect=DEV connect FILE to the local NBD device DEV\n" 80 " -d, --disconnect disconnect the specified device\n" 81 "\n" 82 #endif 83 "\n" 84 "Block device options:\n" 85 " -f, --format=FORMAT set image format (raw, qcow2, ...)\n" 86 " -r, --read-only export read-only\n" 87 " -s, --snapshot use FILE as an external snapshot, create a temporary\n" 88 " file with backing_file=FILE, redirect the write to\n" 89 " the temporary one\n" 90 " -l, --load-snapshot=SNAPSHOT_PARAM\n" 91 " load an internal snapshot inside FILE and export it\n" 92 " as an read-only device, SNAPSHOT_PARAM format is\n" 93 " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n" 94 " '[ID_OR_NAME]'\n" 95 " -n, --nocache disable host cache\n" 96 " --cache=MODE set cache mode (none, writeback, ...)\n" 97 " --aio=MODE set AIO mode (native or threads)\n" 98 " --discard=MODE set discard mode (ignore, unmap)\n" 99 " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n" 100 "\n" 101 "Report bugs to <qemu-devel@nongnu.org>\n" 102 , name, NBD_DEFAULT_PORT, "DEVICE"); 103 } 104 105 static void version(const char *name) 106 { 107 printf( 108 "%s version 0.0.1\n" 109 "Written by Anthony Liguori.\n" 110 "\n" 111 "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n" 112 "This is free software; see the source for copying conditions. There is NO\n" 113 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" 114 , name); 115 } 116 117 struct partition_record 118 { 119 uint8_t bootable; 120 uint8_t start_head; 121 uint32_t start_cylinder; 122 uint8_t start_sector; 123 uint8_t system; 124 uint8_t end_head; 125 uint8_t end_cylinder; 126 uint8_t end_sector; 127 uint32_t start_sector_abs; 128 uint32_t nb_sectors_abs; 129 }; 130 131 static void read_partition(uint8_t *p, struct partition_record *r) 132 { 133 r->bootable = p[0]; 134 r->start_head = p[1]; 135 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); 136 r->start_sector = p[2] & 0x3f; 137 r->system = p[4]; 138 r->end_head = p[5]; 139 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); 140 r->end_sector = p[6] & 0x3f; 141 142 r->start_sector_abs = le32_to_cpup((uint32_t *)(p + 8)); 143 r->nb_sectors_abs = le32_to_cpup((uint32_t *)(p + 12)); 144 } 145 146 static int find_partition(BlockBackend *blk, int partition, 147 off_t *offset, off_t *size) 148 { 149 struct partition_record mbr[4]; 150 uint8_t data[512]; 151 int i; 152 int ext_partnum = 4; 153 int ret; 154 155 if ((ret = blk_read(blk, 0, data, 1)) < 0) { 156 error_report("error while reading: %s", strerror(-ret)); 157 exit(EXIT_FAILURE); 158 } 159 160 if (data[510] != 0x55 || data[511] != 0xaa) { 161 return -EINVAL; 162 } 163 164 for (i = 0; i < 4; i++) { 165 read_partition(&data[446 + 16 * i], &mbr[i]); 166 167 if (!mbr[i].system || !mbr[i].nb_sectors_abs) { 168 continue; 169 } 170 171 if (mbr[i].system == 0xF || mbr[i].system == 0x5) { 172 struct partition_record ext[4]; 173 uint8_t data1[512]; 174 int j; 175 176 if ((ret = blk_read(blk, mbr[i].start_sector_abs, data1, 1)) < 0) { 177 error_report("error while reading: %s", strerror(-ret)); 178 exit(EXIT_FAILURE); 179 } 180 181 for (j = 0; j < 4; j++) { 182 read_partition(&data1[446 + 16 * j], &ext[j]); 183 if (!ext[j].system || !ext[j].nb_sectors_abs) { 184 continue; 185 } 186 187 if ((ext_partnum + j + 1) == partition) { 188 *offset = (uint64_t)ext[j].start_sector_abs << 9; 189 *size = (uint64_t)ext[j].nb_sectors_abs << 9; 190 return 0; 191 } 192 } 193 ext_partnum += 4; 194 } else if ((i + 1) == partition) { 195 *offset = (uint64_t)mbr[i].start_sector_abs << 9; 196 *size = (uint64_t)mbr[i].nb_sectors_abs << 9; 197 return 0; 198 } 199 } 200 201 return -ENOENT; 202 } 203 204 static void termsig_handler(int signum) 205 { 206 state = TERMINATE; 207 qemu_notify_event(); 208 } 209 210 211 static void *show_parts(void *arg) 212 { 213 char *device = arg; 214 int nbd; 215 216 /* linux just needs an open() to trigger 217 * the partition table update 218 * but remember to load the module with max_part != 0 : 219 * modprobe nbd max_part=63 220 */ 221 nbd = open(device, O_RDWR); 222 if (nbd >= 0) { 223 close(nbd); 224 } 225 return NULL; 226 } 227 228 static void *nbd_client_thread(void *arg) 229 { 230 char *device = arg; 231 off_t size; 232 uint32_t nbdflags; 233 int fd, sock; 234 int ret; 235 pthread_t show_parts_thread; 236 Error *local_error = NULL; 237 238 239 sock = socket_connect(saddr, &local_error, NULL, NULL); 240 if (sock < 0) { 241 error_report_err(local_error); 242 goto out; 243 } 244 245 ret = nbd_receive_negotiate(sock, NULL, &nbdflags, 246 &size, &local_error); 247 if (ret < 0) { 248 if (local_error) { 249 error_report_err(local_error); 250 } 251 goto out_socket; 252 } 253 254 fd = open(device, O_RDWR); 255 if (fd < 0) { 256 /* Linux-only, we can use %m in printf. */ 257 error_report("Failed to open %s: %m", device); 258 goto out_socket; 259 } 260 261 ret = nbd_init(fd, sock, nbdflags, size); 262 if (ret < 0) { 263 goto out_fd; 264 } 265 266 /* update partition table */ 267 pthread_create(&show_parts_thread, NULL, show_parts, device); 268 269 if (verbose) { 270 fprintf(stderr, "NBD device %s is now connected to %s\n", 271 device, srcpath); 272 } else { 273 /* Close stderr so that the qemu-nbd process exits. */ 274 dup2(STDOUT_FILENO, STDERR_FILENO); 275 } 276 277 ret = nbd_client(fd); 278 if (ret) { 279 goto out_fd; 280 } 281 close(fd); 282 kill(getpid(), SIGTERM); 283 return (void *) EXIT_SUCCESS; 284 285 out_fd: 286 close(fd); 287 out_socket: 288 closesocket(sock); 289 out: 290 kill(getpid(), SIGTERM); 291 return (void *) EXIT_FAILURE; 292 } 293 294 static int nbd_can_accept(void) 295 { 296 return nb_fds < shared; 297 } 298 299 static void nbd_export_closed(NBDExport *exp) 300 { 301 assert(state == TERMINATING); 302 state = TERMINATED; 303 } 304 305 static void nbd_update_server_fd_handler(int fd); 306 307 static void nbd_client_closed(NBDClient *client) 308 { 309 nb_fds--; 310 if (nb_fds == 0 && !persistent && state == RUNNING) { 311 state = TERMINATE; 312 } 313 nbd_update_server_fd_handler(server_fd); 314 nbd_client_put(client); 315 } 316 317 static void nbd_accept(void *opaque) 318 { 319 struct sockaddr_in addr; 320 socklen_t addr_len = sizeof(addr); 321 322 int fd = accept(server_fd, (struct sockaddr *)&addr, &addr_len); 323 if (fd < 0) { 324 perror("accept"); 325 return; 326 } 327 328 if (state >= TERMINATE) { 329 close(fd); 330 return; 331 } 332 333 nb_fds++; 334 nbd_update_server_fd_handler(server_fd); 335 nbd_client_new(exp, fd, nbd_client_closed); 336 } 337 338 static void nbd_update_server_fd_handler(int fd) 339 { 340 if (nbd_can_accept()) { 341 qemu_set_fd_handler(fd, nbd_accept, NULL, (void *)(uintptr_t)fd); 342 } else { 343 qemu_set_fd_handler(fd, NULL, NULL, NULL); 344 } 345 } 346 347 348 static SocketAddress *nbd_build_socket_address(const char *sockpath, 349 const char *bindto, 350 const char *port) 351 { 352 SocketAddress *saddr; 353 354 saddr = g_new0(SocketAddress, 1); 355 if (sockpath) { 356 saddr->type = SOCKET_ADDRESS_KIND_UNIX; 357 saddr->u.q_unix = g_new0(UnixSocketAddress, 1); 358 saddr->u.q_unix->path = g_strdup(sockpath); 359 } else { 360 saddr->type = SOCKET_ADDRESS_KIND_INET; 361 saddr->u.inet = g_new0(InetSocketAddress, 1); 362 saddr->u.inet->host = g_strdup(bindto); 363 if (port) { 364 saddr->u.inet->port = g_strdup(port); 365 } else { 366 saddr->u.inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT); 367 } 368 } 369 370 return saddr; 371 } 372 373 374 int main(int argc, char **argv) 375 { 376 BlockBackend *blk; 377 BlockDriverState *bs; 378 off_t dev_offset = 0; 379 uint32_t nbdflags = 0; 380 bool disconnect = false; 381 const char *bindto = "0.0.0.0"; 382 const char *port = NULL; 383 char *sockpath = NULL; 384 char *device = NULL; 385 off_t fd_size; 386 QemuOpts *sn_opts = NULL; 387 const char *sn_id_or_name = NULL; 388 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:"; 389 struct option lopt[] = { 390 { "help", 0, NULL, 'h' }, 391 { "version", 0, NULL, 'V' }, 392 { "bind", 1, NULL, 'b' }, 393 { "port", 1, NULL, 'p' }, 394 { "socket", 1, NULL, 'k' }, 395 { "offset", 1, NULL, 'o' }, 396 { "read-only", 0, NULL, 'r' }, 397 { "partition", 1, NULL, 'P' }, 398 { "connect", 1, NULL, 'c' }, 399 { "disconnect", 0, NULL, 'd' }, 400 { "snapshot", 0, NULL, 's' }, 401 { "load-snapshot", 1, NULL, 'l' }, 402 { "nocache", 0, NULL, 'n' }, 403 { "cache", 1, NULL, QEMU_NBD_OPT_CACHE }, 404 { "aio", 1, NULL, QEMU_NBD_OPT_AIO }, 405 { "discard", 1, NULL, QEMU_NBD_OPT_DISCARD }, 406 { "detect-zeroes", 1, NULL, QEMU_NBD_OPT_DETECT_ZEROES }, 407 { "shared", 1, NULL, 'e' }, 408 { "format", 1, NULL, 'f' }, 409 { "persistent", 0, NULL, 't' }, 410 { "verbose", 0, NULL, 'v' }, 411 { NULL, 0, NULL, 0 } 412 }; 413 int ch; 414 int opt_ind = 0; 415 char *end; 416 int flags = BDRV_O_RDWR; 417 int partition = -1; 418 int ret = 0; 419 int fd; 420 bool seen_cache = false; 421 bool seen_discard = false; 422 bool seen_aio = false; 423 pthread_t client_thread; 424 const char *fmt = NULL; 425 Error *local_err = NULL; 426 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 427 QDict *options = NULL; 428 429 /* The client thread uses SIGTERM to interrupt the server. A signal 430 * handler ensures that "qemu-nbd -v -c" exits with a nice status code. 431 */ 432 struct sigaction sa_sigterm; 433 memset(&sa_sigterm, 0, sizeof(sa_sigterm)); 434 sa_sigterm.sa_handler = termsig_handler; 435 sigaction(SIGTERM, &sa_sigterm, NULL); 436 qemu_init_exec_dir(argv[0]); 437 438 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { 439 switch (ch) { 440 case 's': 441 flags |= BDRV_O_SNAPSHOT; 442 break; 443 case 'n': 444 optarg = (char *) "none"; 445 /* fallthrough */ 446 case QEMU_NBD_OPT_CACHE: 447 if (seen_cache) { 448 error_report("-n and --cache can only be specified once"); 449 exit(EXIT_FAILURE); 450 } 451 seen_cache = true; 452 if (bdrv_parse_cache_flags(optarg, &flags) == -1) { 453 error_report("Invalid cache mode `%s'", optarg); 454 exit(EXIT_FAILURE); 455 } 456 break; 457 case QEMU_NBD_OPT_AIO: 458 if (seen_aio) { 459 error_report("--aio can only be specified once"); 460 exit(EXIT_FAILURE); 461 } 462 seen_aio = true; 463 if (!strcmp(optarg, "native")) { 464 flags |= BDRV_O_NATIVE_AIO; 465 } else if (!strcmp(optarg, "threads")) { 466 /* this is the default */ 467 } else { 468 error_report("invalid aio mode `%s'", optarg); 469 exit(EXIT_FAILURE); 470 } 471 break; 472 case QEMU_NBD_OPT_DISCARD: 473 if (seen_discard) { 474 error_report("--discard can only be specified once"); 475 exit(EXIT_FAILURE); 476 } 477 seen_discard = true; 478 if (bdrv_parse_discard_flags(optarg, &flags) == -1) { 479 error_report("Invalid discard mode `%s'", optarg); 480 exit(EXIT_FAILURE); 481 } 482 break; 483 case QEMU_NBD_OPT_DETECT_ZEROES: 484 detect_zeroes = 485 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, 486 optarg, 487 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX, 488 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 489 &local_err); 490 if (local_err) { 491 error_reportf_err(local_err, 492 "Failed to parse detect_zeroes mode: "); 493 exit(EXIT_FAILURE); 494 } 495 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 496 !(flags & BDRV_O_UNMAP)) { 497 error_report("setting detect-zeroes to unmap is not allowed " 498 "without setting discard operation to unmap"); 499 exit(EXIT_FAILURE); 500 } 501 break; 502 case 'b': 503 bindto = optarg; 504 break; 505 case 'p': 506 port = optarg; 507 break; 508 case 'o': 509 dev_offset = strtoll (optarg, &end, 0); 510 if (*end) { 511 error_report("Invalid offset `%s'", optarg); 512 exit(EXIT_FAILURE); 513 } 514 if (dev_offset < 0) { 515 error_report("Offset must be positive `%s'", optarg); 516 exit(EXIT_FAILURE); 517 } 518 break; 519 case 'l': 520 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) { 521 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts, 522 optarg, false); 523 if (!sn_opts) { 524 error_report("Failed in parsing snapshot param `%s'", 525 optarg); 526 exit(EXIT_FAILURE); 527 } 528 } else { 529 sn_id_or_name = optarg; 530 } 531 /* fall through */ 532 case 'r': 533 nbdflags |= NBD_FLAG_READ_ONLY; 534 flags &= ~BDRV_O_RDWR; 535 break; 536 case 'P': 537 partition = strtol(optarg, &end, 0); 538 if (*end) { 539 error_report("Invalid partition `%s'", optarg); 540 exit(EXIT_FAILURE); 541 } 542 if (partition < 1 || partition > 8) { 543 error_report("Invalid partition %d", partition); 544 exit(EXIT_FAILURE); 545 } 546 break; 547 case 'k': 548 sockpath = optarg; 549 if (sockpath[0] != '/') { 550 error_report("socket path must be absolute"); 551 exit(EXIT_FAILURE); 552 } 553 break; 554 case 'd': 555 disconnect = true; 556 break; 557 case 'c': 558 device = optarg; 559 break; 560 case 'e': 561 shared = strtol(optarg, &end, 0); 562 if (*end) { 563 error_report("Invalid shared device number '%s'", optarg); 564 exit(EXIT_FAILURE); 565 } 566 if (shared < 1) { 567 error_report("Shared device number must be greater than 0"); 568 exit(EXIT_FAILURE); 569 } 570 break; 571 case 'f': 572 fmt = optarg; 573 break; 574 case 't': 575 persistent = 1; 576 break; 577 case 'v': 578 verbose = 1; 579 break; 580 case 'V': 581 version(argv[0]); 582 exit(0); 583 break; 584 case 'h': 585 usage(argv[0]); 586 exit(0); 587 break; 588 case '?': 589 error_report("Try `%s --help' for more information.", argv[0]); 590 exit(EXIT_FAILURE); 591 } 592 } 593 594 if ((argc - optind) != 1) { 595 error_report("Invalid number of arguments"); 596 error_printf("Try `%s --help' for more information.\n", argv[0]); 597 exit(EXIT_FAILURE); 598 } 599 600 if (disconnect) { 601 fd = open(argv[optind], O_RDWR); 602 if (fd < 0) { 603 error_report("Cannot open %s: %s", argv[optind], 604 strerror(errno)); 605 exit(EXIT_FAILURE); 606 } 607 nbd_disconnect(fd); 608 609 close(fd); 610 611 printf("%s disconnected\n", argv[optind]); 612 613 return 0; 614 } 615 616 if (device && !verbose) { 617 int stderr_fd[2]; 618 pid_t pid; 619 int ret; 620 621 if (qemu_pipe(stderr_fd) < 0) { 622 error_report("Error setting up communication pipe: %s", 623 strerror(errno)); 624 exit(EXIT_FAILURE); 625 } 626 627 /* Now daemonize, but keep a communication channel open to 628 * print errors and exit with the proper status code. 629 */ 630 pid = fork(); 631 if (pid < 0) { 632 error_report("Failed to fork: %s", strerror(errno)); 633 exit(EXIT_FAILURE); 634 } else if (pid == 0) { 635 close(stderr_fd[0]); 636 ret = qemu_daemon(1, 0); 637 638 /* Temporarily redirect stderr to the parent's pipe... */ 639 dup2(stderr_fd[1], STDERR_FILENO); 640 if (ret < 0) { 641 error_report("Failed to daemonize: %s", strerror(errno)); 642 exit(EXIT_FAILURE); 643 } 644 645 /* ... close the descriptor we inherited and go on. */ 646 close(stderr_fd[1]); 647 } else { 648 bool errors = false; 649 char *buf; 650 651 /* In the parent. Print error messages from the child until 652 * it closes the pipe. 653 */ 654 close(stderr_fd[1]); 655 buf = g_malloc(1024); 656 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { 657 errors = true; 658 ret = qemu_write_full(STDERR_FILENO, buf, ret); 659 if (ret < 0) { 660 exit(EXIT_FAILURE); 661 } 662 } 663 if (ret < 0) { 664 error_report("Cannot read from daemon: %s", 665 strerror(errno)); 666 exit(EXIT_FAILURE); 667 } 668 669 /* Usually the daemon should not print any message. 670 * Exit with zero status in that case. 671 */ 672 exit(errors); 673 } 674 } 675 676 if (device != NULL && sockpath == NULL) { 677 sockpath = g_malloc(128); 678 snprintf(sockpath, 128, SOCKET_PATH, basename(device)); 679 } 680 681 saddr = nbd_build_socket_address(sockpath, bindto, port); 682 683 if (qemu_init_main_loop(&local_err)) { 684 error_report_err(local_err); 685 exit(EXIT_FAILURE); 686 } 687 bdrv_init(); 688 atexit(bdrv_close_all); 689 690 if (fmt) { 691 options = qdict_new(); 692 qdict_put(options, "driver", qstring_from_str(fmt)); 693 } 694 695 srcpath = argv[optind]; 696 blk = blk_new_open("hda", srcpath, NULL, options, flags, &local_err); 697 if (!blk) { 698 error_reportf_err(local_err, "Failed to blk_new_open '%s': ", 699 argv[optind]); 700 exit(EXIT_FAILURE); 701 } 702 bs = blk_bs(blk); 703 704 if (sn_opts) { 705 ret = bdrv_snapshot_load_tmp(bs, 706 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID), 707 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME), 708 &local_err); 709 } else if (sn_id_or_name) { 710 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name, 711 &local_err); 712 } 713 if (ret < 0) { 714 error_reportf_err(local_err, "Failed to load snapshot: "); 715 exit(EXIT_FAILURE); 716 } 717 718 bs->detect_zeroes = detect_zeroes; 719 fd_size = blk_getlength(blk); 720 if (fd_size < 0) { 721 error_report("Failed to determine the image length: %s", 722 strerror(-fd_size)); 723 exit(EXIT_FAILURE); 724 } 725 726 if (partition != -1) { 727 ret = find_partition(blk, partition, &dev_offset, &fd_size); 728 if (ret < 0) { 729 error_report("Could not find partition %d: %s", partition, 730 strerror(-ret)); 731 exit(EXIT_FAILURE); 732 } 733 } 734 735 exp = nbd_export_new(blk, dev_offset, fd_size, nbdflags, nbd_export_closed, 736 &local_err); 737 if (!exp) { 738 error_report_err(local_err); 739 exit(EXIT_FAILURE); 740 } 741 742 fd = socket_listen(saddr, &local_err); 743 if (fd < 0) { 744 error_report_err(local_err); 745 return 1; 746 } 747 748 if (device) { 749 int ret; 750 751 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device); 752 if (ret != 0) { 753 error_report("Failed to create client thread: %s", strerror(ret)); 754 exit(EXIT_FAILURE); 755 } 756 } else { 757 /* Shut up GCC warnings. */ 758 memset(&client_thread, 0, sizeof(client_thread)); 759 } 760 761 server_fd = fd; 762 nbd_update_server_fd_handler(fd); 763 764 /* now when the initialization is (almost) complete, chdir("/") 765 * to free any busy filesystems */ 766 if (chdir("/") < 0) { 767 error_report("Could not chdir to root directory: %s", 768 strerror(errno)); 769 exit(EXIT_FAILURE); 770 } 771 772 state = RUNNING; 773 do { 774 main_loop_wait(false); 775 if (state == TERMINATE) { 776 state = TERMINATING; 777 nbd_export_close(exp); 778 nbd_export_put(exp); 779 exp = NULL; 780 } 781 } while (state != TERMINATED); 782 783 blk_unref(blk); 784 if (sockpath) { 785 unlink(sockpath); 786 } 787 788 qemu_opts_del(sn_opts); 789 790 if (device) { 791 void *ret; 792 pthread_join(client_thread, &ret); 793 exit(ret != NULL); 794 } else { 795 exit(EXIT_SUCCESS); 796 } 797 } 798