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-common.h" 20 #include "sysemu/block-backend.h" 21 #include "block/block_int.h" 22 #include "block/nbd.h" 23 #include "qemu/main-loop.h" 24 #include "qemu/sockets.h" 25 #include "qemu/error-report.h" 26 #include "block/snapshot.h" 27 #include "qapi/util.h" 28 #include "qapi/qmp/qstring.h" 29 30 #include <stdarg.h> 31 #include <stdio.h> 32 #include <getopt.h> 33 #include <sys/types.h> 34 #include <sys/socket.h> 35 #include <netinet/in.h> 36 #include <netinet/tcp.h> 37 #include <arpa/inet.h> 38 #include <signal.h> 39 #include <libgen.h> 40 #include <pthread.h> 41 42 #define SOCKET_PATH "/var/lock/qemu-nbd-%s" 43 #define QEMU_NBD_OPT_CACHE 1 44 #define QEMU_NBD_OPT_AIO 2 45 #define QEMU_NBD_OPT_DISCARD 3 46 #define QEMU_NBD_OPT_DETECT_ZEROES 4 47 48 static NBDExport *exp; 49 static int verbose; 50 static char *srcpath; 51 static SocketAddress *saddr; 52 static int persistent = 0; 53 static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state; 54 static int shared = 1; 55 static int nb_fds; 56 static int server_fd; 57 58 static void usage(const char *name) 59 { 60 (printf) ( 61 "Usage: %s [OPTIONS] FILE\n" 62 "QEMU Disk Network Block Device Server\n" 63 "\n" 64 " -h, --help display this help and exit\n" 65 " -V, --version output version information and exit\n" 66 "\n" 67 "Connection properties:\n" 68 " -p, --port=PORT port to listen on (default `%d')\n" 69 " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" 70 " -k, --socket=PATH path to the unix socket\n" 71 " (default '"SOCKET_PATH"')\n" 72 " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" 73 " -t, --persistent don't exit on the last connection\n" 74 " -v, --verbose display extra debugging information\n" 75 "\n" 76 "Exposing part of the image:\n" 77 " -o, --offset=OFFSET offset into the image\n" 78 " -P, --partition=NUM only expose partition NUM\n" 79 "\n" 80 #ifdef __linux__ 81 "Kernel NBD client support:\n" 82 " -c, --connect=DEV connect FILE to the local NBD device DEV\n" 83 " -d, --disconnect disconnect the specified device\n" 84 "\n" 85 #endif 86 "\n" 87 "Block device options:\n" 88 " -f, --format=FORMAT set image format (raw, qcow2, ...)\n" 89 " -r, --read-only export read-only\n" 90 " -s, --snapshot use FILE as an external snapshot, create a temporary\n" 91 " file with backing_file=FILE, redirect the write to\n" 92 " the temporary one\n" 93 " -l, --load-snapshot=SNAPSHOT_PARAM\n" 94 " load an internal snapshot inside FILE and export it\n" 95 " as an read-only device, SNAPSHOT_PARAM format is\n" 96 " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n" 97 " '[ID_OR_NAME]'\n" 98 " -n, --nocache disable host cache\n" 99 " --cache=MODE set cache mode (none, writeback, ...)\n" 100 " --aio=MODE set AIO mode (native or threads)\n" 101 " --discard=MODE set discard mode (ignore, unmap)\n" 102 " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n" 103 "\n" 104 "Report bugs to <qemu-devel@nongnu.org>\n" 105 , name, NBD_DEFAULT_PORT, "DEVICE"); 106 } 107 108 static void version(const char *name) 109 { 110 printf( 111 "%s version 0.0.1\n" 112 "Written by Anthony Liguori.\n" 113 "\n" 114 "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n" 115 "This is free software; see the source for copying conditions. There is NO\n" 116 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" 117 , name); 118 } 119 120 struct partition_record 121 { 122 uint8_t bootable; 123 uint8_t start_head; 124 uint32_t start_cylinder; 125 uint8_t start_sector; 126 uint8_t system; 127 uint8_t end_head; 128 uint8_t end_cylinder; 129 uint8_t end_sector; 130 uint32_t start_sector_abs; 131 uint32_t nb_sectors_abs; 132 }; 133 134 static void read_partition(uint8_t *p, struct partition_record *r) 135 { 136 r->bootable = p[0]; 137 r->start_head = p[1]; 138 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); 139 r->start_sector = p[2] & 0x3f; 140 r->system = p[4]; 141 r->end_head = p[5]; 142 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); 143 r->end_sector = p[6] & 0x3f; 144 145 r->start_sector_abs = le32_to_cpup((uint32_t *)(p + 8)); 146 r->nb_sectors_abs = le32_to_cpup((uint32_t *)(p + 12)); 147 } 148 149 static int find_partition(BlockBackend *blk, int partition, 150 off_t *offset, off_t *size) 151 { 152 struct partition_record mbr[4]; 153 uint8_t data[512]; 154 int i; 155 int ext_partnum = 4; 156 int ret; 157 158 if ((ret = blk_read(blk, 0, data, 1)) < 0) { 159 error_report("error while reading: %s", strerror(-ret)); 160 exit(EXIT_FAILURE); 161 } 162 163 if (data[510] != 0x55 || data[511] != 0xaa) { 164 return -EINVAL; 165 } 166 167 for (i = 0; i < 4; i++) { 168 read_partition(&data[446 + 16 * i], &mbr[i]); 169 170 if (!mbr[i].system || !mbr[i].nb_sectors_abs) { 171 continue; 172 } 173 174 if (mbr[i].system == 0xF || mbr[i].system == 0x5) { 175 struct partition_record ext[4]; 176 uint8_t data1[512]; 177 int j; 178 179 if ((ret = blk_read(blk, mbr[i].start_sector_abs, data1, 1)) < 0) { 180 error_report("error while reading: %s", strerror(-ret)); 181 exit(EXIT_FAILURE); 182 } 183 184 for (j = 0; j < 4; j++) { 185 read_partition(&data1[446 + 16 * j], &ext[j]); 186 if (!ext[j].system || !ext[j].nb_sectors_abs) { 187 continue; 188 } 189 190 if ((ext_partnum + j + 1) == partition) { 191 *offset = (uint64_t)ext[j].start_sector_abs << 9; 192 *size = (uint64_t)ext[j].nb_sectors_abs << 9; 193 return 0; 194 } 195 } 196 ext_partnum += 4; 197 } else if ((i + 1) == partition) { 198 *offset = (uint64_t)mbr[i].start_sector_abs << 9; 199 *size = (uint64_t)mbr[i].nb_sectors_abs << 9; 200 return 0; 201 } 202 } 203 204 return -ENOENT; 205 } 206 207 static void termsig_handler(int signum) 208 { 209 state = TERMINATE; 210 qemu_notify_event(); 211 } 212 213 214 static void *show_parts(void *arg) 215 { 216 char *device = arg; 217 int nbd; 218 219 /* linux just needs an open() to trigger 220 * the partition table update 221 * but remember to load the module with max_part != 0 : 222 * modprobe nbd max_part=63 223 */ 224 nbd = open(device, O_RDWR); 225 if (nbd >= 0) { 226 close(nbd); 227 } 228 return NULL; 229 } 230 231 static void *nbd_client_thread(void *arg) 232 { 233 char *device = arg; 234 off_t size; 235 uint32_t nbdflags; 236 int fd, sock; 237 int ret; 238 pthread_t show_parts_thread; 239 Error *local_error = NULL; 240 241 242 sock = socket_connect(saddr, &local_error, NULL, NULL); 243 if (sock < 0) { 244 error_report_err(local_error); 245 goto out; 246 } 247 248 ret = nbd_receive_negotiate(sock, NULL, &nbdflags, 249 &size, &local_error); 250 if (ret < 0) { 251 if (local_error) { 252 error_report_err(local_error); 253 } 254 goto out_socket; 255 } 256 257 fd = open(device, O_RDWR); 258 if (fd < 0) { 259 /* Linux-only, we can use %m in printf. */ 260 error_report("Failed to open %s: %m", device); 261 goto out_socket; 262 } 263 264 ret = nbd_init(fd, sock, nbdflags, size); 265 if (ret < 0) { 266 goto out_fd; 267 } 268 269 /* update partition table */ 270 pthread_create(&show_parts_thread, NULL, show_parts, device); 271 272 if (verbose) { 273 fprintf(stderr, "NBD device %s is now connected to %s\n", 274 device, srcpath); 275 } else { 276 /* Close stderr so that the qemu-nbd process exits. */ 277 dup2(STDOUT_FILENO, STDERR_FILENO); 278 } 279 280 ret = nbd_client(fd); 281 if (ret) { 282 goto out_fd; 283 } 284 close(fd); 285 kill(getpid(), SIGTERM); 286 return (void *) EXIT_SUCCESS; 287 288 out_fd: 289 close(fd); 290 out_socket: 291 closesocket(sock); 292 out: 293 kill(getpid(), SIGTERM); 294 return (void *) EXIT_FAILURE; 295 } 296 297 static int nbd_can_accept(void) 298 { 299 return nb_fds < shared; 300 } 301 302 static void nbd_export_closed(NBDExport *exp) 303 { 304 assert(state == TERMINATING); 305 state = TERMINATED; 306 } 307 308 static void nbd_update_server_fd_handler(int fd); 309 310 static void nbd_client_closed(NBDClient *client) 311 { 312 nb_fds--; 313 if (nb_fds == 0 && !persistent && state == RUNNING) { 314 state = TERMINATE; 315 } 316 nbd_update_server_fd_handler(server_fd); 317 nbd_client_put(client); 318 } 319 320 static void nbd_accept(void *opaque) 321 { 322 struct sockaddr_in addr; 323 socklen_t addr_len = sizeof(addr); 324 325 int fd = accept(server_fd, (struct sockaddr *)&addr, &addr_len); 326 if (fd < 0) { 327 perror("accept"); 328 return; 329 } 330 331 if (state >= TERMINATE) { 332 close(fd); 333 return; 334 } 335 336 nb_fds++; 337 nbd_update_server_fd_handler(server_fd); 338 nbd_client_new(exp, fd, nbd_client_closed); 339 } 340 341 static void nbd_update_server_fd_handler(int fd) 342 { 343 if (nbd_can_accept()) { 344 qemu_set_fd_handler(fd, nbd_accept, NULL, (void *)(uintptr_t)fd); 345 } else { 346 qemu_set_fd_handler(fd, NULL, NULL, NULL); 347 } 348 } 349 350 351 static SocketAddress *nbd_build_socket_address(const char *sockpath, 352 const char *bindto, 353 const char *port) 354 { 355 SocketAddress *saddr; 356 357 saddr = g_new0(SocketAddress, 1); 358 if (sockpath) { 359 saddr->type = SOCKET_ADDRESS_KIND_UNIX; 360 saddr->u.q_unix = g_new0(UnixSocketAddress, 1); 361 saddr->u.q_unix->path = g_strdup(sockpath); 362 } else { 363 saddr->type = SOCKET_ADDRESS_KIND_INET; 364 saddr->u.inet = g_new0(InetSocketAddress, 1); 365 saddr->u.inet->host = g_strdup(bindto); 366 if (port) { 367 saddr->u.inet->port = g_strdup(port); 368 } else { 369 saddr->u.inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT); 370 } 371 } 372 373 return saddr; 374 } 375 376 377 int main(int argc, char **argv) 378 { 379 BlockBackend *blk; 380 BlockDriverState *bs; 381 off_t dev_offset = 0; 382 uint32_t nbdflags = 0; 383 bool disconnect = false; 384 const char *bindto = "0.0.0.0"; 385 const char *port = NULL; 386 char *sockpath = NULL; 387 char *device = NULL; 388 off_t fd_size; 389 QemuOpts *sn_opts = NULL; 390 const char *sn_id_or_name = NULL; 391 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:"; 392 struct option lopt[] = { 393 { "help", 0, NULL, 'h' }, 394 { "version", 0, NULL, 'V' }, 395 { "bind", 1, NULL, 'b' }, 396 { "port", 1, NULL, 'p' }, 397 { "socket", 1, NULL, 'k' }, 398 { "offset", 1, NULL, 'o' }, 399 { "read-only", 0, NULL, 'r' }, 400 { "partition", 1, NULL, 'P' }, 401 { "connect", 1, NULL, 'c' }, 402 { "disconnect", 0, NULL, 'd' }, 403 { "snapshot", 0, NULL, 's' }, 404 { "load-snapshot", 1, NULL, 'l' }, 405 { "nocache", 0, NULL, 'n' }, 406 { "cache", 1, NULL, QEMU_NBD_OPT_CACHE }, 407 { "aio", 1, NULL, QEMU_NBD_OPT_AIO }, 408 { "discard", 1, NULL, QEMU_NBD_OPT_DISCARD }, 409 { "detect-zeroes", 1, NULL, QEMU_NBD_OPT_DETECT_ZEROES }, 410 { "shared", 1, NULL, 'e' }, 411 { "format", 1, NULL, 'f' }, 412 { "persistent", 0, NULL, 't' }, 413 { "verbose", 0, NULL, 'v' }, 414 { NULL, 0, NULL, 0 } 415 }; 416 int ch; 417 int opt_ind = 0; 418 char *end; 419 int flags = BDRV_O_RDWR; 420 int partition = -1; 421 int ret = 0; 422 int fd; 423 bool seen_cache = false; 424 bool seen_discard = false; 425 bool seen_aio = false; 426 pthread_t client_thread; 427 const char *fmt = NULL; 428 Error *local_err = NULL; 429 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 430 QDict *options = NULL; 431 432 /* The client thread uses SIGTERM to interrupt the server. A signal 433 * handler ensures that "qemu-nbd -v -c" exits with a nice status code. 434 */ 435 struct sigaction sa_sigterm; 436 memset(&sa_sigterm, 0, sizeof(sa_sigterm)); 437 sa_sigterm.sa_handler = termsig_handler; 438 sigaction(SIGTERM, &sa_sigterm, NULL); 439 qemu_init_exec_dir(argv[0]); 440 441 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { 442 switch (ch) { 443 case 's': 444 flags |= BDRV_O_SNAPSHOT; 445 break; 446 case 'n': 447 optarg = (char *) "none"; 448 /* fallthrough */ 449 case QEMU_NBD_OPT_CACHE: 450 if (seen_cache) { 451 error_report("-n and --cache can only be specified once"); 452 exit(EXIT_FAILURE); 453 } 454 seen_cache = true; 455 if (bdrv_parse_cache_flags(optarg, &flags) == -1) { 456 error_report("Invalid cache mode `%s'", optarg); 457 exit(EXIT_FAILURE); 458 } 459 break; 460 case QEMU_NBD_OPT_AIO: 461 if (seen_aio) { 462 error_report("--aio can only be specified once"); 463 exit(EXIT_FAILURE); 464 } 465 seen_aio = true; 466 if (!strcmp(optarg, "native")) { 467 flags |= BDRV_O_NATIVE_AIO; 468 } else if (!strcmp(optarg, "threads")) { 469 /* this is the default */ 470 } else { 471 error_report("invalid aio mode `%s'", optarg); 472 exit(EXIT_FAILURE); 473 } 474 break; 475 case QEMU_NBD_OPT_DISCARD: 476 if (seen_discard) { 477 error_report("--discard can only be specified once"); 478 exit(EXIT_FAILURE); 479 } 480 seen_discard = true; 481 if (bdrv_parse_discard_flags(optarg, &flags) == -1) { 482 error_report("Invalid discard mode `%s'", optarg); 483 exit(EXIT_FAILURE); 484 } 485 break; 486 case QEMU_NBD_OPT_DETECT_ZEROES: 487 detect_zeroes = 488 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, 489 optarg, 490 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX, 491 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 492 &local_err); 493 if (local_err) { 494 error_reportf_err(local_err, 495 "Failed to parse detect_zeroes mode: "); 496 exit(EXIT_FAILURE); 497 } 498 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 499 !(flags & BDRV_O_UNMAP)) { 500 error_report("setting detect-zeroes to unmap is not allowed " 501 "without setting discard operation to unmap"); 502 exit(EXIT_FAILURE); 503 } 504 break; 505 case 'b': 506 bindto = optarg; 507 break; 508 case 'p': 509 port = optarg; 510 break; 511 case 'o': 512 dev_offset = strtoll (optarg, &end, 0); 513 if (*end) { 514 error_report("Invalid offset `%s'", optarg); 515 exit(EXIT_FAILURE); 516 } 517 if (dev_offset < 0) { 518 error_report("Offset must be positive `%s'", optarg); 519 exit(EXIT_FAILURE); 520 } 521 break; 522 case 'l': 523 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) { 524 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts, 525 optarg, false); 526 if (!sn_opts) { 527 error_report("Failed in parsing snapshot param `%s'", 528 optarg); 529 exit(EXIT_FAILURE); 530 } 531 } else { 532 sn_id_or_name = optarg; 533 } 534 /* fall through */ 535 case 'r': 536 nbdflags |= NBD_FLAG_READ_ONLY; 537 flags &= ~BDRV_O_RDWR; 538 break; 539 case 'P': 540 partition = strtol(optarg, &end, 0); 541 if (*end) { 542 error_report("Invalid partition `%s'", optarg); 543 exit(EXIT_FAILURE); 544 } 545 if (partition < 1 || partition > 8) { 546 error_report("Invalid partition %d", partition); 547 exit(EXIT_FAILURE); 548 } 549 break; 550 case 'k': 551 sockpath = optarg; 552 if (sockpath[0] != '/') { 553 error_report("socket path must be absolute"); 554 exit(EXIT_FAILURE); 555 } 556 break; 557 case 'd': 558 disconnect = true; 559 break; 560 case 'c': 561 device = optarg; 562 break; 563 case 'e': 564 shared = strtol(optarg, &end, 0); 565 if (*end) { 566 error_report("Invalid shared device number '%s'", optarg); 567 exit(EXIT_FAILURE); 568 } 569 if (shared < 1) { 570 error_report("Shared device number must be greater than 0"); 571 exit(EXIT_FAILURE); 572 } 573 break; 574 case 'f': 575 fmt = optarg; 576 break; 577 case 't': 578 persistent = 1; 579 break; 580 case 'v': 581 verbose = 1; 582 break; 583 case 'V': 584 version(argv[0]); 585 exit(0); 586 break; 587 case 'h': 588 usage(argv[0]); 589 exit(0); 590 break; 591 case '?': 592 error_report("Try `%s --help' for more information.", argv[0]); 593 exit(EXIT_FAILURE); 594 } 595 } 596 597 if ((argc - optind) != 1) { 598 error_report("Invalid number of arguments"); 599 error_printf("Try `%s --help' for more information.\n", argv[0]); 600 exit(EXIT_FAILURE); 601 } 602 603 if (disconnect) { 604 fd = open(argv[optind], O_RDWR); 605 if (fd < 0) { 606 error_report("Cannot open %s: %s", argv[optind], 607 strerror(errno)); 608 exit(EXIT_FAILURE); 609 } 610 nbd_disconnect(fd); 611 612 close(fd); 613 614 printf("%s disconnected\n", argv[optind]); 615 616 return 0; 617 } 618 619 if (device && !verbose) { 620 int stderr_fd[2]; 621 pid_t pid; 622 int ret; 623 624 if (qemu_pipe(stderr_fd) < 0) { 625 error_report("Error setting up communication pipe: %s", 626 strerror(errno)); 627 exit(EXIT_FAILURE); 628 } 629 630 /* Now daemonize, but keep a communication channel open to 631 * print errors and exit with the proper status code. 632 */ 633 pid = fork(); 634 if (pid < 0) { 635 error_report("Failed to fork: %s", strerror(errno)); 636 exit(EXIT_FAILURE); 637 } else if (pid == 0) { 638 close(stderr_fd[0]); 639 ret = qemu_daemon(1, 0); 640 641 /* Temporarily redirect stderr to the parent's pipe... */ 642 dup2(stderr_fd[1], STDERR_FILENO); 643 if (ret < 0) { 644 error_report("Failed to daemonize: %s", strerror(errno)); 645 exit(EXIT_FAILURE); 646 } 647 648 /* ... close the descriptor we inherited and go on. */ 649 close(stderr_fd[1]); 650 } else { 651 bool errors = false; 652 char *buf; 653 654 /* In the parent. Print error messages from the child until 655 * it closes the pipe. 656 */ 657 close(stderr_fd[1]); 658 buf = g_malloc(1024); 659 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { 660 errors = true; 661 ret = qemu_write_full(STDERR_FILENO, buf, ret); 662 if (ret < 0) { 663 exit(EXIT_FAILURE); 664 } 665 } 666 if (ret < 0) { 667 error_report("Cannot read from daemon: %s", 668 strerror(errno)); 669 exit(EXIT_FAILURE); 670 } 671 672 /* Usually the daemon should not print any message. 673 * Exit with zero status in that case. 674 */ 675 exit(errors); 676 } 677 } 678 679 if (device != NULL && sockpath == NULL) { 680 sockpath = g_malloc(128); 681 snprintf(sockpath, 128, SOCKET_PATH, basename(device)); 682 } 683 684 saddr = nbd_build_socket_address(sockpath, bindto, port); 685 686 if (qemu_init_main_loop(&local_err)) { 687 error_report_err(local_err); 688 exit(EXIT_FAILURE); 689 } 690 bdrv_init(); 691 atexit(bdrv_close_all); 692 693 if (fmt) { 694 options = qdict_new(); 695 qdict_put(options, "driver", qstring_from_str(fmt)); 696 } 697 698 srcpath = argv[optind]; 699 blk = blk_new_open("hda", srcpath, NULL, options, flags, &local_err); 700 if (!blk) { 701 error_reportf_err(local_err, "Failed to blk_new_open '%s': ", 702 argv[optind]); 703 exit(EXIT_FAILURE); 704 } 705 bs = blk_bs(blk); 706 707 if (sn_opts) { 708 ret = bdrv_snapshot_load_tmp(bs, 709 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID), 710 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME), 711 &local_err); 712 } else if (sn_id_or_name) { 713 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name, 714 &local_err); 715 } 716 if (ret < 0) { 717 error_reportf_err(local_err, "Failed to load snapshot: "); 718 exit(EXIT_FAILURE); 719 } 720 721 bs->detect_zeroes = detect_zeroes; 722 fd_size = blk_getlength(blk); 723 if (fd_size < 0) { 724 error_report("Failed to determine the image length: %s", 725 strerror(-fd_size)); 726 exit(EXIT_FAILURE); 727 } 728 729 if (partition != -1) { 730 ret = find_partition(blk, partition, &dev_offset, &fd_size); 731 if (ret < 0) { 732 error_report("Could not find partition %d: %s", partition, 733 strerror(-ret)); 734 exit(EXIT_FAILURE); 735 } 736 } 737 738 exp = nbd_export_new(blk, dev_offset, fd_size, nbdflags, nbd_export_closed, 739 &local_err); 740 if (!exp) { 741 error_report_err(local_err); 742 exit(EXIT_FAILURE); 743 } 744 745 fd = socket_listen(saddr, &local_err); 746 if (fd < 0) { 747 error_report_err(local_err); 748 return 1; 749 } 750 751 if (device) { 752 int ret; 753 754 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device); 755 if (ret != 0) { 756 error_report("Failed to create client thread: %s", strerror(ret)); 757 exit(EXIT_FAILURE); 758 } 759 } else { 760 /* Shut up GCC warnings. */ 761 memset(&client_thread, 0, sizeof(client_thread)); 762 } 763 764 server_fd = fd; 765 nbd_update_server_fd_handler(fd); 766 767 /* now when the initialization is (almost) complete, chdir("/") 768 * to free any busy filesystems */ 769 if (chdir("/") < 0) { 770 error_report("Could not chdir to root directory: %s", 771 strerror(errno)); 772 exit(EXIT_FAILURE); 773 } 774 775 state = RUNNING; 776 do { 777 main_loop_wait(false); 778 if (state == TERMINATE) { 779 state = TERMINATING; 780 nbd_export_close(exp); 781 nbd_export_put(exp); 782 exp = NULL; 783 } 784 } while (state != TERMINATED); 785 786 blk_unref(blk); 787 if (sockpath) { 788 unlink(sockpath); 789 } 790 791 qemu_opts_del(sn_opts); 792 793 if (device) { 794 void *ret; 795 pthread_join(client_thread, &ret); 796 exit(ret != NULL); 797 } else { 798 exit(EXIT_SUCCESS); 799 } 800 } 801