2 * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
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.
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.
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/>.
19 #include "qemu/osdep.h"
20 #include "qapi/error.h"
21 #include "qemu-common.h"
22 #include "qemu/cutils.h"
23 #include "sysemu/block-backend.h"
24 #include "block/block_int.h"
25 #include "block/nbd.h"
26 #include "qemu/main-loop.h"
27 #include "qemu/error-report.h"
28 #include "qemu/config-file.h"
29 #include "qemu/bswap.h"
31 #include "qemu/systemd.h"
32 #include "block/snapshot.h"
33 #include "qapi/util.h"
34 #include "qapi/qmp/qstring.h"
35 #include "qom/object_interfaces.h"
36 #include "io/channel-socket.h"
37 #include "crypto/init.h"
38 #include "trace/control.h"
44 #define SOCKET_PATH "/var/lock/qemu-nbd-%s"
45 #define QEMU_NBD_OPT_CACHE 256
46 #define QEMU_NBD_OPT_AIO 257
47 #define QEMU_NBD_OPT_DISCARD 258
48 #define QEMU_NBD_OPT_DETECT_ZEROES 259
49 #define QEMU_NBD_OPT_OBJECT 260
50 #define QEMU_NBD_OPT_TLSCREDS 261
51 #define QEMU_NBD_OPT_IMAGE_OPTS 262
52 #define QEMU_NBD_OPT_FORK 263
56 static NBDExport *exp;
60 static SocketAddress *saddr;
61 static int persistent = 0;
62 static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state;
63 static int shared = 1;
65 static QIOChannelSocket *server_ioc;
66 static int server_watch = -1;
67 static QCryptoTLSCreds *tlscreds;
69 static void usage(const char *name)
72 "Usage: %s [OPTIONS] FILE\n"
73 "QEMU Disk Network Block Device Server\n"
75 " -h, --help display this help and exit\n"
76 " -V, --version output version information and exit\n"
78 "Connection properties:\n"
79 " -p, --port=PORT port to listen on (default `%d')\n"
80 " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
81 " -k, --socket=PATH path to the unix socket\n"
82 " (default '"SOCKET_PATH"')\n"
83 " -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
84 " -t, --persistent don't exit on the last connection\n"
85 " -v, --verbose display extra debugging information\n"
86 " -x, --export-name=NAME expose export by name\n"
87 " -D, --description=TEXT with -x, also export a human-readable description\n"
89 "Exposing part of the image:\n"
90 " -o, --offset=OFFSET offset into the image\n"
91 " -P, --partition=NUM only expose partition NUM\n"
93 "General purpose options:\n"
94 " --object type,id=ID,... define an object such as 'secret' for providing\n"
95 " passwords and/or encryption keys\n"
96 " -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
97 " specify tracing options\n"
98 " --fork fork off the server process and exit the parent\n"
99 " once the server is running\n"
101 "Kernel NBD client support:\n"
102 " -c, --connect=DEV connect FILE to the local NBD device DEV\n"
103 " -d, --disconnect disconnect the specified device\n"
107 "Block device options:\n"
108 " -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
109 " -r, --read-only export read-only\n"
110 " -s, --snapshot use FILE as an external snapshot, create a temporary\n"
111 " file with backing_file=FILE, redirect the write to\n"
112 " the temporary one\n"
113 " -l, --load-snapshot=SNAPSHOT_PARAM\n"
114 " load an internal snapshot inside FILE and export it\n"
115 " as an read-only device, SNAPSHOT_PARAM format is\n"
116 " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
118 " -n, --nocache disable host cache\n"
119 " --cache=MODE set cache mode (none, writeback, ...)\n"
120 " --aio=MODE set AIO mode (native or threads)\n"
121 " --discard=MODE set discard mode (ignore, unmap)\n"
122 " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
123 " --image-opts treat FILE as a full set of image options\n"
125 "Report bugs to <qemu-devel@nongnu.org>\n"
126 , name, NBD_DEFAULT_PORT, "DEVICE");
129 static void version(const char *name)
133 "Written by Anthony Liguori.\n"
135 "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n"
136 "This is free software; see the source for copying conditions. There is NO\n"
137 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
141 struct partition_record
145 uint32_t start_cylinder;
146 uint8_t start_sector;
149 uint8_t end_cylinder;
151 uint32_t start_sector_abs;
152 uint32_t nb_sectors_abs;
155 static void read_partition(uint8_t *p, struct partition_record *r)
158 r->start_head = p[1];
159 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300);
160 r->start_sector = p[2] & 0x3f;
163 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300);
164 r->end_sector = p[6] & 0x3f;
166 r->start_sector_abs = ldl_le_p(p + 8);
167 r->nb_sectors_abs = ldl_le_p(p + 12);
170 static int find_partition(BlockBackend *blk, int partition,
171 off_t *offset, off_t *size)
173 struct partition_record mbr[4];
174 uint8_t data[MBR_SIZE];
179 ret = blk_pread(blk, 0, data, sizeof(data));
181 error_report("error while reading: %s", strerror(-ret));
185 if (data[510] != 0x55 || data[511] != 0xaa) {
189 for (i = 0; i < 4; i++) {
190 read_partition(&data[446 + 16 * i], &mbr[i]);
192 if (!mbr[i].system || !mbr[i].nb_sectors_abs) {
196 if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
197 struct partition_record ext[4];
198 uint8_t data1[MBR_SIZE];
201 ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE,
202 data1, sizeof(data1));
204 error_report("error while reading: %s", strerror(-ret));
208 for (j = 0; j < 4; j++) {
209 read_partition(&data1[446 + 16 * j], &ext[j]);
210 if (!ext[j].system || !ext[j].nb_sectors_abs) {
214 if ((ext_partnum + j + 1) == partition) {
215 *offset = (uint64_t)ext[j].start_sector_abs << 9;
216 *size = (uint64_t)ext[j].nb_sectors_abs << 9;
221 } else if ((i + 1) == partition) {
222 *offset = (uint64_t)mbr[i].start_sector_abs << 9;
223 *size = (uint64_t)mbr[i].nb_sectors_abs << 9;
231 static void termsig_handler(int signum)
233 atomic_cmpxchg(&state, RUNNING, TERMINATE);
238 static void *show_parts(void *arg)
243 /* linux just needs an open() to trigger
244 * the partition table update
245 * but remember to load the module with max_part != 0 :
246 * modprobe nbd max_part=63
248 nbd = open(device, O_RDWR);
255 static void *nbd_client_thread(void *arg)
260 QIOChannelSocket *sioc;
263 pthread_t show_parts_thread;
264 Error *local_error = NULL;
266 sioc = qio_channel_socket_new();
267 if (qio_channel_socket_connect_sync(sioc,
270 error_report_err(local_error);
274 ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL, &nbdflags,
276 &size, &local_error);
279 error_report_err(local_error);
284 fd = open(device, O_RDWR);
286 /* Linux-only, we can use %m in printf. */
287 error_report("Failed to open %s: %m", device);
291 ret = nbd_init(fd, sioc, nbdflags, size, &local_error);
293 error_report_err(local_error);
297 /* update partition table */
298 pthread_create(&show_parts_thread, NULL, show_parts, device);
301 fprintf(stderr, "NBD device %s is now connected to %s\n",
304 /* Close stderr so that the qemu-nbd process exits. */
305 dup2(STDOUT_FILENO, STDERR_FILENO);
308 ret = nbd_client(fd);
313 object_unref(OBJECT(sioc));
314 kill(getpid(), SIGTERM);
315 return (void *) EXIT_SUCCESS;
320 object_unref(OBJECT(sioc));
322 kill(getpid(), SIGTERM);
323 return (void *) EXIT_FAILURE;
326 static int nbd_can_accept(void)
328 return state == RUNNING && nb_fds < shared;
331 static void nbd_export_closed(NBDExport *exp)
333 assert(state == TERMINATING);
337 static void nbd_update_server_watch(void);
339 static void nbd_client_closed(NBDClient *client, bool negotiated)
342 if (negotiated && nb_fds == 0 && !persistent && state == RUNNING) {
345 nbd_update_server_watch();
346 nbd_client_put(client);
349 static gboolean nbd_accept(QIOChannel *ioc, GIOCondition cond, gpointer opaque)
351 QIOChannelSocket *cioc;
353 cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
359 if (state >= TERMINATE) {
360 object_unref(OBJECT(cioc));
365 nbd_update_server_watch();
366 nbd_client_new(newproto ? NULL : exp, cioc,
367 tlscreds, NULL, nbd_client_closed);
368 object_unref(OBJECT(cioc));
373 static void nbd_update_server_watch(void)
375 if (nbd_can_accept()) {
376 if (server_watch == -1) {
377 server_watch = qio_channel_add_watch(QIO_CHANNEL(server_ioc),
383 if (server_watch != -1) {
384 g_source_remove(server_watch);
391 static SocketAddress *nbd_build_socket_address(const char *sockpath,
395 SocketAddress *saddr;
397 saddr = g_new0(SocketAddress, 1);
399 saddr->type = SOCKET_ADDRESS_TYPE_UNIX;
400 saddr->u.q_unix.path = g_strdup(sockpath);
402 InetSocketAddress *inet;
403 saddr->type = SOCKET_ADDRESS_TYPE_INET;
404 inet = &saddr->u.inet;
405 inet->host = g_strdup(bindto);
407 inet->port = g_strdup(port);
409 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
417 static QemuOptsList file_opts = {
419 .implied_opt_name = "file",
420 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
422 /* no elements => accept any params */
423 { /* end of list */ }
427 static QemuOptsList qemu_object_opts = {
429 .implied_opt_name = "qom-type",
430 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
438 static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp)
441 QCryptoTLSCreds *creds;
443 obj = object_resolve_path_component(
444 object_get_objects_root(), id);
446 error_setg(errp, "No TLS credentials with id '%s'",
450 creds = (QCryptoTLSCreds *)
451 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
453 error_setg(errp, "Object with id '%s' is not TLS credentials",
458 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
460 "Expecting TLS credentials with a server endpoint");
467 static void setup_address_and_port(const char **address, const char **port)
469 if (*address == NULL) {
470 *address = "0.0.0.0";
474 *port = stringify(NBD_DEFAULT_PORT);
479 * Check socket parameters compatibility when socket activation is used.
481 static const char *socket_activation_validate_opts(const char *device,
482 const char *sockpath,
486 if (device != NULL) {
487 return "NBD device can't be set when using socket activation";
490 if (sockpath != NULL) {
491 return "Unix socket can't be set when using socket activation";
494 if (address != NULL) {
495 return "The interface can't be set when using socket activation";
499 return "TCP port number can't be set when using socket activation";
505 int main(int argc, char **argv)
508 BlockDriverState *bs;
509 off_t dev_offset = 0;
510 uint16_t nbdflags = 0;
511 bool disconnect = false;
512 const char *bindto = NULL;
513 const char *port = NULL;
514 char *sockpath = NULL;
517 QemuOpts *sn_opts = NULL;
518 const char *sn_id_or_name = NULL;
519 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:D:";
520 struct option lopt[] = {
521 { "help", no_argument, NULL, 'h' },
522 { "version", no_argument, NULL, 'V' },
523 { "bind", required_argument, NULL, 'b' },
524 { "port", required_argument, NULL, 'p' },
525 { "socket", required_argument, NULL, 'k' },
526 { "offset", required_argument, NULL, 'o' },
527 { "read-only", no_argument, NULL, 'r' },
528 { "partition", required_argument, NULL, 'P' },
529 { "connect", required_argument, NULL, 'c' },
530 { "disconnect", no_argument, NULL, 'd' },
531 { "snapshot", no_argument, NULL, 's' },
532 { "load-snapshot", required_argument, NULL, 'l' },
533 { "nocache", no_argument, NULL, 'n' },
534 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE },
535 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO },
536 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD },
537 { "detect-zeroes", required_argument, NULL,
538 QEMU_NBD_OPT_DETECT_ZEROES },
539 { "shared", required_argument, NULL, 'e' },
540 { "format", required_argument, NULL, 'f' },
541 { "persistent", no_argument, NULL, 't' },
542 { "verbose", no_argument, NULL, 'v' },
543 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT },
544 { "export-name", required_argument, NULL, 'x' },
545 { "description", required_argument, NULL, 'D' },
546 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS },
547 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
548 { "trace", required_argument, NULL, 'T' },
549 { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK },
555 int flags = BDRV_O_RDWR;
558 bool seen_cache = false;
559 bool seen_discard = false;
560 bool seen_aio = false;
561 pthread_t client_thread;
562 const char *fmt = NULL;
563 Error *local_err = NULL;
564 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
565 QDict *options = NULL;
566 const char *export_name = NULL;
567 const char *export_description = NULL;
568 const char *tlscredsid = NULL;
569 bool imageOpts = false;
570 bool writethrough = true;
571 char *trace_file = NULL;
572 bool fork_process = false;
574 unsigned socket_activation;
576 /* The client thread uses SIGTERM to interrupt the server. A signal
577 * handler ensures that "qemu-nbd -v -c" exits with a nice status code.
579 struct sigaction sa_sigterm;
580 memset(&sa_sigterm, 0, sizeof(sa_sigterm));
581 sa_sigterm.sa_handler = termsig_handler;
582 sigaction(SIGTERM, &sa_sigterm, NULL);
585 signal(SIGPIPE, SIG_IGN);
588 module_call_init(MODULE_INIT_TRACE);
589 qcrypto_init(&error_fatal);
591 module_call_init(MODULE_INIT_QOM);
592 qemu_add_opts(&qemu_object_opts);
593 qemu_add_opts(&qemu_trace_opts);
594 qemu_init_exec_dir(argv[0]);
596 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
599 flags |= BDRV_O_SNAPSHOT;
602 optarg = (char *) "none";
604 case QEMU_NBD_OPT_CACHE:
606 error_report("-n and --cache can only be specified once");
610 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) {
611 error_report("Invalid cache mode `%s'", optarg);
615 case QEMU_NBD_OPT_AIO:
617 error_report("--aio can only be specified once");
621 if (!strcmp(optarg, "native")) {
622 flags |= BDRV_O_NATIVE_AIO;
623 } else if (!strcmp(optarg, "threads")) {
624 /* this is the default */
626 error_report("invalid aio mode `%s'", optarg);
630 case QEMU_NBD_OPT_DISCARD:
632 error_report("--discard can only be specified once");
636 if (bdrv_parse_discard_flags(optarg, &flags) == -1) {
637 error_report("Invalid discard mode `%s'", optarg);
641 case QEMU_NBD_OPT_DETECT_ZEROES:
643 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
645 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
646 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
649 error_reportf_err(local_err,
650 "Failed to parse detect_zeroes mode: ");
653 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
654 !(flags & BDRV_O_UNMAP)) {
655 error_report("setting detect-zeroes to unmap is not allowed "
656 "without setting discard operation to unmap");
667 dev_offset = strtoll (optarg, &end, 0);
669 error_report("Invalid offset `%s'", optarg);
672 if (dev_offset < 0) {
673 error_report("Offset must be positive `%s'", optarg);
678 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
679 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
682 error_report("Failed in parsing snapshot param `%s'",
687 sn_id_or_name = optarg;
691 nbdflags |= NBD_FLAG_READ_ONLY;
692 flags &= ~BDRV_O_RDWR;
695 partition = strtol(optarg, &end, 0);
697 error_report("Invalid partition `%s'", optarg);
700 if (partition < 1 || partition > 8) {
701 error_report("Invalid partition %d", partition);
707 if (sockpath[0] != '/') {
708 error_report("socket path must be absolute");
719 shared = strtol(optarg, &end, 0);
721 error_report("Invalid shared device number '%s'", optarg);
725 error_report("Shared device number must be greater than 0");
736 export_name = optarg;
739 export_description = optarg;
753 error_report("Try `%s --help' for more information.", argv[0]);
755 case QEMU_NBD_OPT_OBJECT: {
757 opts = qemu_opts_parse_noisily(&qemu_object_opts,
763 case QEMU_NBD_OPT_TLSCREDS:
766 case QEMU_NBD_OPT_IMAGE_OPTS:
771 trace_file = trace_opt_parse(optarg);
773 case QEMU_NBD_OPT_FORK:
779 if ((argc - optind) != 1) {
780 error_report("Invalid number of arguments");
781 error_printf("Try `%s --help' for more information.\n", argv[0]);
785 if (qemu_opts_foreach(&qemu_object_opts,
786 user_creatable_add_opts_foreach,
791 if (!trace_init_backends()) {
794 trace_init_file(trace_file);
795 qemu_set_log(LOG_TRACE);
797 socket_activation = check_socket_activation();
798 if (socket_activation == 0) {
799 setup_address_and_port(&bindto, &port);
801 /* Using socket activation - check user didn't use -p etc. */
802 const char *err_msg = socket_activation_validate_opts(device, sockpath,
804 if (err_msg != NULL) {
805 error_report("%s", err_msg);
809 /* qemu-nbd can only listen on a single socket. */
810 if (socket_activation > 1) {
811 error_report("qemu-nbd does not support socket activation with %s > 1",
819 error_report("TLS is only supported with IPv4/IPv6");
823 error_report("TLS is not supported with a host device");
827 /* Set the default NBD protocol export name, since
828 * we *must* use new style protocol for TLS */
831 tlscreds = nbd_get_tls_creds(tlscredsid, &local_err);
833 error_report("Failed to get TLS creds %s",
834 error_get_pretty(local_err));
840 int nbdfd = open(argv[optind], O_RDWR);
842 error_report("Cannot open %s: %s", argv[optind],
846 nbd_disconnect(nbdfd);
850 printf("%s disconnected\n", argv[optind]);
855 if ((device && !verbose) || fork_process) {
860 if (qemu_pipe(stderr_fd) < 0) {
861 error_report("Error setting up communication pipe: %s",
866 /* Now daemonize, but keep a communication channel open to
867 * print errors and exit with the proper status code.
871 error_report("Failed to fork: %s", strerror(errno));
873 } else if (pid == 0) {
875 ret = qemu_daemon(1, 0);
877 /* Temporarily redirect stderr to the parent's pipe... */
878 old_stderr = dup(STDERR_FILENO);
879 dup2(stderr_fd[1], STDERR_FILENO);
881 error_report("Failed to daemonize: %s", strerror(errno));
885 /* ... close the descriptor we inherited and go on. */
891 /* In the parent. Print error messages from the child until
892 * it closes the pipe.
895 buf = g_malloc(1024);
896 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
898 ret = qemu_write_full(STDERR_FILENO, buf, ret);
904 error_report("Cannot read from daemon: %s",
909 /* Usually the daemon should not print any message.
910 * Exit with zero status in that case.
916 if (device != NULL && sockpath == NULL) {
917 sockpath = g_malloc(128);
918 snprintf(sockpath, 128, SOCKET_PATH, basename(device));
921 if (socket_activation == 0) {
922 server_ioc = qio_channel_socket_new();
923 saddr = nbd_build_socket_address(sockpath, bindto, port);
924 if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) {
925 object_unref(OBJECT(server_ioc));
926 error_report_err(local_err);
930 /* See comment in check_socket_activation above. */
931 assert(socket_activation == 1);
932 server_ioc = qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD,
934 if (server_ioc == NULL) {
935 error_report("Failed to use socket activation: %s",
936 error_get_pretty(local_err));
941 if (qemu_init_main_loop(&local_err)) {
942 error_report_err(local_err);
946 atexit(bdrv_close_all);
948 srcpath = argv[optind];
952 error_report("--image-opts and -f are mutually exclusive");
955 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
957 qemu_opts_reset(&file_opts);
960 options = qemu_opts_to_qdict(opts, NULL);
961 qemu_opts_reset(&file_opts);
962 blk = blk_new_open(NULL, NULL, options, flags, &local_err);
965 options = qdict_new();
966 qdict_put_str(options, "driver", fmt);
968 blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
972 error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
978 blk_set_enable_write_cache(blk, !writethrough);
981 ret = bdrv_snapshot_load_tmp(bs,
982 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
983 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
985 } else if (sn_id_or_name) {
986 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
990 error_reportf_err(local_err, "Failed to load snapshot: ");
994 bs->detect_zeroes = detect_zeroes;
995 fd_size = blk_getlength(blk);
997 error_report("Failed to determine the image length: %s",
1002 if (dev_offset >= fd_size) {
1003 error_report("Offset (%lld) has to be smaller than the image size "
1005 (long long int)dev_offset, (long long int)fd_size);
1008 fd_size -= dev_offset;
1010 if (partition != -1) {
1011 ret = find_partition(blk, partition, &dev_offset, &fd_size);
1013 error_report("Could not find partition %d: %s", partition,
1019 exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed,
1020 writethrough, NULL, &local_err);
1022 error_report_err(local_err);
1026 nbd_export_set_name(exp, export_name);
1027 nbd_export_set_description(exp, export_description);
1029 } else if (export_description) {
1030 error_report("Export description requires an export name");
1037 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
1039 error_report("Failed to create client thread: %s", strerror(ret));
1043 /* Shut up GCC warnings. */
1044 memset(&client_thread, 0, sizeof(client_thread));
1047 nbd_update_server_watch();
1049 /* now when the initialization is (almost) complete, chdir("/")
1050 * to free any busy filesystems */
1051 if (chdir("/") < 0) {
1052 error_report("Could not chdir to root directory: %s",
1058 dup2(old_stderr, STDERR_FILENO);
1064 main_loop_wait(false);
1065 if (state == TERMINATE) {
1066 state = TERMINATING;
1067 nbd_export_close(exp);
1068 nbd_export_put(exp);
1071 } while (state != TERMINATED);
1078 qemu_opts_del(sn_opts);
1082 pthread_join(client_thread, &ret);