cpu: Support a target CPU having a variable page size
[qemu/ar7.git] / qemu-nbd.c
blobcca4a983b77add95d2fc103960cea010f52bf7c1
1 /*
2 * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
4 * Network Block Device
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"
30 #include "qemu/log.h"
31 #include "block/snapshot.h"
32 #include "qapi/util.h"
33 #include "qapi/qmp/qstring.h"
34 #include "qom/object_interfaces.h"
35 #include "io/channel-socket.h"
36 #include "crypto/init.h"
37 #include "trace/control.h"
39 #include <getopt.h>
40 #include <libgen.h>
41 #include <pthread.h>
43 #define SOCKET_PATH "/var/lock/qemu-nbd-%s"
44 #define QEMU_NBD_OPT_CACHE 256
45 #define QEMU_NBD_OPT_AIO 257
46 #define QEMU_NBD_OPT_DISCARD 258
47 #define QEMU_NBD_OPT_DETECT_ZEROES 259
48 #define QEMU_NBD_OPT_OBJECT 260
49 #define QEMU_NBD_OPT_TLSCREDS 261
50 #define QEMU_NBD_OPT_IMAGE_OPTS 262
52 #define MBR_SIZE 512
54 static NBDExport *exp;
55 static bool newproto;
56 static int verbose;
57 static char *srcpath;
58 static SocketAddress *saddr;
59 static int persistent = 0;
60 static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state;
61 static int shared = 1;
62 static int nb_fds;
63 static QIOChannelSocket *server_ioc;
64 static int server_watch = -1;
65 static QCryptoTLSCreds *tlscreds;
67 static void usage(const char *name)
69 (printf) (
70 "Usage: %s [OPTIONS] FILE\n"
71 "QEMU Disk Network Block Device Server\n"
72 "\n"
73 " -h, --help display this help and exit\n"
74 " -V, --version output version information and exit\n"
75 "\n"
76 "Connection properties:\n"
77 " -p, --port=PORT port to listen on (default `%d')\n"
78 " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
79 " -k, --socket=PATH path to the unix socket\n"
80 " (default '"SOCKET_PATH"')\n"
81 " -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
82 " -t, --persistent don't exit on the last connection\n"
83 " -v, --verbose display extra debugging information\n"
84 " -x, --export-name=NAME expose export by name\n"
85 "\n"
86 "Exposing part of the image:\n"
87 " -o, --offset=OFFSET offset into the image\n"
88 " -P, --partition=NUM only expose partition NUM\n"
89 "\n"
90 "General purpose options:\n"
91 " --object type,id=ID,... define an object such as 'secret' for providing\n"
92 " passwords and/or encryption keys\n"
93 " -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
94 " specify tracing options\n"
95 #ifdef __linux__
96 "Kernel NBD client support:\n"
97 " -c, --connect=DEV connect FILE to the local NBD device DEV\n"
98 " -d, --disconnect disconnect the specified device\n"
99 "\n"
100 #endif
101 "\n"
102 "Block device options:\n"
103 " -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
104 " -r, --read-only export read-only\n"
105 " -s, --snapshot use FILE as an external snapshot, create a temporary\n"
106 " file with backing_file=FILE, redirect the write to\n"
107 " the temporary one\n"
108 " -l, --load-snapshot=SNAPSHOT_PARAM\n"
109 " load an internal snapshot inside FILE and export it\n"
110 " as an read-only device, SNAPSHOT_PARAM format is\n"
111 " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
112 " '[ID_OR_NAME]'\n"
113 " -n, --nocache disable host cache\n"
114 " --cache=MODE set cache mode (none, writeback, ...)\n"
115 " --aio=MODE set AIO mode (native or threads)\n"
116 " --discard=MODE set discard mode (ignore, unmap)\n"
117 " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
118 " --image-opts treat FILE as a full set of image options\n"
119 "\n"
120 "Report bugs to <qemu-devel@nongnu.org>\n"
121 , name, NBD_DEFAULT_PORT, "DEVICE");
124 static void version(const char *name)
126 printf(
127 "%s version 0.0.1\n"
128 "Written by Anthony Liguori.\n"
129 "\n"
130 "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n"
131 "This is free software; see the source for copying conditions. There is NO\n"
132 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
133 , name);
136 struct partition_record
138 uint8_t bootable;
139 uint8_t start_head;
140 uint32_t start_cylinder;
141 uint8_t start_sector;
142 uint8_t system;
143 uint8_t end_head;
144 uint8_t end_cylinder;
145 uint8_t end_sector;
146 uint32_t start_sector_abs;
147 uint32_t nb_sectors_abs;
150 static void read_partition(uint8_t *p, struct partition_record *r)
152 r->bootable = p[0];
153 r->start_head = p[1];
154 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300);
155 r->start_sector = p[2] & 0x3f;
156 r->system = p[4];
157 r->end_head = p[5];
158 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300);
159 r->end_sector = p[6] & 0x3f;
161 r->start_sector_abs = ldl_le_p(p + 8);
162 r->nb_sectors_abs = ldl_le_p(p + 12);
165 static int find_partition(BlockBackend *blk, int partition,
166 off_t *offset, off_t *size)
168 struct partition_record mbr[4];
169 uint8_t data[MBR_SIZE];
170 int i;
171 int ext_partnum = 4;
172 int ret;
174 ret = blk_pread(blk, 0, data, sizeof(data));
175 if (ret < 0) {
176 error_report("error while reading: %s", strerror(-ret));
177 exit(EXIT_FAILURE);
180 if (data[510] != 0x55 || data[511] != 0xaa) {
181 return -EINVAL;
184 for (i = 0; i < 4; i++) {
185 read_partition(&data[446 + 16 * i], &mbr[i]);
187 if (!mbr[i].system || !mbr[i].nb_sectors_abs) {
188 continue;
191 if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
192 struct partition_record ext[4];
193 uint8_t data1[MBR_SIZE];
194 int j;
196 ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE,
197 data1, sizeof(data1));
198 if (ret < 0) {
199 error_report("error while reading: %s", strerror(-ret));
200 exit(EXIT_FAILURE);
203 for (j = 0; j < 4; j++) {
204 read_partition(&data1[446 + 16 * j], &ext[j]);
205 if (!ext[j].system || !ext[j].nb_sectors_abs) {
206 continue;
209 if ((ext_partnum + j + 1) == partition) {
210 *offset = (uint64_t)ext[j].start_sector_abs << 9;
211 *size = (uint64_t)ext[j].nb_sectors_abs << 9;
212 return 0;
215 ext_partnum += 4;
216 } else if ((i + 1) == partition) {
217 *offset = (uint64_t)mbr[i].start_sector_abs << 9;
218 *size = (uint64_t)mbr[i].nb_sectors_abs << 9;
219 return 0;
223 return -ENOENT;
226 static void termsig_handler(int signum)
228 atomic_cmpxchg(&state, RUNNING, TERMINATE);
229 qemu_notify_event();
233 static void *show_parts(void *arg)
235 char *device = arg;
236 int nbd;
238 /* linux just needs an open() to trigger
239 * the partition table update
240 * but remember to load the module with max_part != 0 :
241 * modprobe nbd max_part=63
243 nbd = open(device, O_RDWR);
244 if (nbd >= 0) {
245 close(nbd);
247 return NULL;
250 static void *nbd_client_thread(void *arg)
252 char *device = arg;
253 off_t size;
254 uint16_t nbdflags;
255 QIOChannelSocket *sioc;
256 int fd;
257 int ret;
258 pthread_t show_parts_thread;
259 Error *local_error = NULL;
261 sioc = qio_channel_socket_new();
262 if (qio_channel_socket_connect_sync(sioc,
263 saddr,
264 &local_error) < 0) {
265 error_report_err(local_error);
266 goto out;
269 ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL, &nbdflags,
270 NULL, NULL, NULL,
271 &size, &local_error);
272 if (ret < 0) {
273 if (local_error) {
274 error_report_err(local_error);
276 goto out_socket;
279 fd = open(device, O_RDWR);
280 if (fd < 0) {
281 /* Linux-only, we can use %m in printf. */
282 error_report("Failed to open %s: %m", device);
283 goto out_socket;
286 ret = nbd_init(fd, sioc, nbdflags, size);
287 if (ret < 0) {
288 goto out_fd;
291 /* update partition table */
292 pthread_create(&show_parts_thread, NULL, show_parts, device);
294 if (verbose) {
295 fprintf(stderr, "NBD device %s is now connected to %s\n",
296 device, srcpath);
297 } else {
298 /* Close stderr so that the qemu-nbd process exits. */
299 dup2(STDOUT_FILENO, STDERR_FILENO);
302 ret = nbd_client(fd);
303 if (ret) {
304 goto out_fd;
306 close(fd);
307 object_unref(OBJECT(sioc));
308 kill(getpid(), SIGTERM);
309 return (void *) EXIT_SUCCESS;
311 out_fd:
312 close(fd);
313 out_socket:
314 object_unref(OBJECT(sioc));
315 out:
316 kill(getpid(), SIGTERM);
317 return (void *) EXIT_FAILURE;
320 static int nbd_can_accept(void)
322 return nb_fds < shared;
325 static void nbd_export_closed(NBDExport *exp)
327 assert(state == TERMINATING);
328 state = TERMINATED;
331 static void nbd_update_server_watch(void);
333 static void nbd_client_closed(NBDClient *client)
335 nb_fds--;
336 if (nb_fds == 0 && !persistent && state == RUNNING) {
337 state = TERMINATE;
339 nbd_update_server_watch();
340 nbd_client_put(client);
343 static gboolean nbd_accept(QIOChannel *ioc, GIOCondition cond, gpointer opaque)
345 QIOChannelSocket *cioc;
347 cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
348 NULL);
349 if (!cioc) {
350 return TRUE;
353 if (state >= TERMINATE) {
354 object_unref(OBJECT(cioc));
355 return TRUE;
358 nb_fds++;
359 nbd_update_server_watch();
360 nbd_client_new(newproto ? NULL : exp, cioc,
361 tlscreds, NULL, nbd_client_closed);
362 object_unref(OBJECT(cioc));
364 return TRUE;
367 static void nbd_update_server_watch(void)
369 if (nbd_can_accept()) {
370 if (server_watch == -1) {
371 server_watch = qio_channel_add_watch(QIO_CHANNEL(server_ioc),
372 G_IO_IN,
373 nbd_accept,
374 NULL, NULL);
376 } else {
377 if (server_watch != -1) {
378 g_source_remove(server_watch);
379 server_watch = -1;
385 static SocketAddress *nbd_build_socket_address(const char *sockpath,
386 const char *bindto,
387 const char *port)
389 SocketAddress *saddr;
391 saddr = g_new0(SocketAddress, 1);
392 if (sockpath) {
393 saddr->type = SOCKET_ADDRESS_KIND_UNIX;
394 saddr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
395 saddr->u.q_unix.data->path = g_strdup(sockpath);
396 } else {
397 InetSocketAddress *inet;
398 saddr->type = SOCKET_ADDRESS_KIND_INET;
399 inet = saddr->u.inet.data = g_new0(InetSocketAddress, 1);
400 inet->host = g_strdup(bindto);
401 if (port) {
402 inet->port = g_strdup(port);
403 } else {
404 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
408 return saddr;
412 static QemuOptsList file_opts = {
413 .name = "file",
414 .implied_opt_name = "file",
415 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
416 .desc = {
417 /* no elements => accept any params */
418 { /* end of list */ }
422 static QemuOptsList qemu_object_opts = {
423 .name = "object",
424 .implied_opt_name = "qom-type",
425 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
426 .desc = {
433 static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp)
435 Object *obj;
436 QCryptoTLSCreds *creds;
438 obj = object_resolve_path_component(
439 object_get_objects_root(), id);
440 if (!obj) {
441 error_setg(errp, "No TLS credentials with id '%s'",
442 id);
443 return NULL;
445 creds = (QCryptoTLSCreds *)
446 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
447 if (!creds) {
448 error_setg(errp, "Object with id '%s' is not TLS credentials",
449 id);
450 return NULL;
453 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
454 error_setg(errp,
455 "Expecting TLS credentials with a server endpoint");
456 return NULL;
458 object_ref(obj);
459 return creds;
463 int main(int argc, char **argv)
465 BlockBackend *blk;
466 BlockDriverState *bs;
467 off_t dev_offset = 0;
468 uint16_t nbdflags = 0;
469 bool disconnect = false;
470 const char *bindto = "0.0.0.0";
471 const char *port = NULL;
472 char *sockpath = NULL;
473 char *device = NULL;
474 off_t fd_size;
475 QemuOpts *sn_opts = NULL;
476 const char *sn_id_or_name = NULL;
477 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:";
478 struct option lopt[] = {
479 { "help", no_argument, NULL, 'h' },
480 { "version", no_argument, NULL, 'V' },
481 { "bind", required_argument, NULL, 'b' },
482 { "port", required_argument, NULL, 'p' },
483 { "socket", required_argument, NULL, 'k' },
484 { "offset", required_argument, NULL, 'o' },
485 { "read-only", no_argument, NULL, 'r' },
486 { "partition", required_argument, NULL, 'P' },
487 { "connect", required_argument, NULL, 'c' },
488 { "disconnect", no_argument, NULL, 'd' },
489 { "snapshot", no_argument, NULL, 's' },
490 { "load-snapshot", required_argument, NULL, 'l' },
491 { "nocache", no_argument, NULL, 'n' },
492 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE },
493 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO },
494 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD },
495 { "detect-zeroes", required_argument, NULL,
496 QEMU_NBD_OPT_DETECT_ZEROES },
497 { "shared", required_argument, NULL, 'e' },
498 { "format", required_argument, NULL, 'f' },
499 { "persistent", no_argument, NULL, 't' },
500 { "verbose", no_argument, NULL, 'v' },
501 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT },
502 { "export-name", required_argument, NULL, 'x' },
503 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS },
504 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
505 { "trace", required_argument, NULL, 'T' },
506 { NULL, 0, NULL, 0 }
508 int ch;
509 int opt_ind = 0;
510 char *end;
511 int flags = BDRV_O_RDWR;
512 int partition = -1;
513 int ret = 0;
514 bool seen_cache = false;
515 bool seen_discard = false;
516 bool seen_aio = false;
517 pthread_t client_thread;
518 const char *fmt = NULL;
519 Error *local_err = NULL;
520 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
521 QDict *options = NULL;
522 const char *export_name = NULL;
523 const char *tlscredsid = NULL;
524 bool imageOpts = false;
525 bool writethrough = true;
526 char *trace_file = NULL;
528 /* The client thread uses SIGTERM to interrupt the server. A signal
529 * handler ensures that "qemu-nbd -v -c" exits with a nice status code.
531 struct sigaction sa_sigterm;
532 memset(&sa_sigterm, 0, sizeof(sa_sigterm));
533 sa_sigterm.sa_handler = termsig_handler;
534 sigaction(SIGTERM, &sa_sigterm, NULL);
536 module_call_init(MODULE_INIT_TRACE);
537 qcrypto_init(&error_fatal);
539 module_call_init(MODULE_INIT_QOM);
540 qemu_add_opts(&qemu_object_opts);
541 qemu_add_opts(&qemu_trace_opts);
542 qemu_init_exec_dir(argv[0]);
544 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
545 switch (ch) {
546 case 's':
547 flags |= BDRV_O_SNAPSHOT;
548 break;
549 case 'n':
550 optarg = (char *) "none";
551 /* fallthrough */
552 case QEMU_NBD_OPT_CACHE:
553 if (seen_cache) {
554 error_report("-n and --cache can only be specified once");
555 exit(EXIT_FAILURE);
557 seen_cache = true;
558 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) {
559 error_report("Invalid cache mode `%s'", optarg);
560 exit(EXIT_FAILURE);
562 break;
563 case QEMU_NBD_OPT_AIO:
564 if (seen_aio) {
565 error_report("--aio can only be specified once");
566 exit(EXIT_FAILURE);
568 seen_aio = true;
569 if (!strcmp(optarg, "native")) {
570 flags |= BDRV_O_NATIVE_AIO;
571 } else if (!strcmp(optarg, "threads")) {
572 /* this is the default */
573 } else {
574 error_report("invalid aio mode `%s'", optarg);
575 exit(EXIT_FAILURE);
577 break;
578 case QEMU_NBD_OPT_DISCARD:
579 if (seen_discard) {
580 error_report("--discard can only be specified once");
581 exit(EXIT_FAILURE);
583 seen_discard = true;
584 if (bdrv_parse_discard_flags(optarg, &flags) == -1) {
585 error_report("Invalid discard mode `%s'", optarg);
586 exit(EXIT_FAILURE);
588 break;
589 case QEMU_NBD_OPT_DETECT_ZEROES:
590 detect_zeroes =
591 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
592 optarg,
593 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
594 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
595 &local_err);
596 if (local_err) {
597 error_reportf_err(local_err,
598 "Failed to parse detect_zeroes mode: ");
599 exit(EXIT_FAILURE);
601 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
602 !(flags & BDRV_O_UNMAP)) {
603 error_report("setting detect-zeroes to unmap is not allowed "
604 "without setting discard operation to unmap");
605 exit(EXIT_FAILURE);
607 break;
608 case 'b':
609 bindto = optarg;
610 break;
611 case 'p':
612 port = optarg;
613 break;
614 case 'o':
615 dev_offset = strtoll (optarg, &end, 0);
616 if (*end) {
617 error_report("Invalid offset `%s'", optarg);
618 exit(EXIT_FAILURE);
620 if (dev_offset < 0) {
621 error_report("Offset must be positive `%s'", optarg);
622 exit(EXIT_FAILURE);
624 break;
625 case 'l':
626 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
627 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
628 optarg, false);
629 if (!sn_opts) {
630 error_report("Failed in parsing snapshot param `%s'",
631 optarg);
632 exit(EXIT_FAILURE);
634 } else {
635 sn_id_or_name = optarg;
637 /* fall through */
638 case 'r':
639 nbdflags |= NBD_FLAG_READ_ONLY;
640 flags &= ~BDRV_O_RDWR;
641 break;
642 case 'P':
643 partition = strtol(optarg, &end, 0);
644 if (*end) {
645 error_report("Invalid partition `%s'", optarg);
646 exit(EXIT_FAILURE);
648 if (partition < 1 || partition > 8) {
649 error_report("Invalid partition %d", partition);
650 exit(EXIT_FAILURE);
652 break;
653 case 'k':
654 sockpath = optarg;
655 if (sockpath[0] != '/') {
656 error_report("socket path must be absolute");
657 exit(EXIT_FAILURE);
659 break;
660 case 'd':
661 disconnect = true;
662 break;
663 case 'c':
664 device = optarg;
665 break;
666 case 'e':
667 shared = strtol(optarg, &end, 0);
668 if (*end) {
669 error_report("Invalid shared device number '%s'", optarg);
670 exit(EXIT_FAILURE);
672 if (shared < 1) {
673 error_report("Shared device number must be greater than 0");
674 exit(EXIT_FAILURE);
676 break;
677 case 'f':
678 fmt = optarg;
679 break;
680 case 't':
681 persistent = 1;
682 break;
683 case 'x':
684 export_name = optarg;
685 break;
686 case 'v':
687 verbose = 1;
688 break;
689 case 'V':
690 version(argv[0]);
691 exit(0);
692 break;
693 case 'h':
694 usage(argv[0]);
695 exit(0);
696 break;
697 case '?':
698 error_report("Try `%s --help' for more information.", argv[0]);
699 exit(EXIT_FAILURE);
700 case QEMU_NBD_OPT_OBJECT: {
701 QemuOpts *opts;
702 opts = qemu_opts_parse_noisily(&qemu_object_opts,
703 optarg, true);
704 if (!opts) {
705 exit(EXIT_FAILURE);
707 } break;
708 case QEMU_NBD_OPT_TLSCREDS:
709 tlscredsid = optarg;
710 break;
711 case QEMU_NBD_OPT_IMAGE_OPTS:
712 imageOpts = true;
713 break;
714 case 'T':
715 g_free(trace_file);
716 trace_file = trace_opt_parse(optarg);
717 break;
721 if ((argc - optind) != 1) {
722 error_report("Invalid number of arguments");
723 error_printf("Try `%s --help' for more information.\n", argv[0]);
724 exit(EXIT_FAILURE);
727 if (qemu_opts_foreach(&qemu_object_opts,
728 user_creatable_add_opts_foreach,
729 NULL, NULL)) {
730 exit(EXIT_FAILURE);
733 if (!trace_init_backends()) {
734 exit(1);
736 trace_init_file(trace_file);
737 qemu_set_log(LOG_TRACE);
739 if (tlscredsid) {
740 if (sockpath) {
741 error_report("TLS is only supported with IPv4/IPv6");
742 exit(EXIT_FAILURE);
744 if (device) {
745 error_report("TLS is not supported with a host device");
746 exit(EXIT_FAILURE);
748 if (!export_name) {
749 /* Set the default NBD protocol export name, since
750 * we *must* use new style protocol for TLS */
751 export_name = "";
753 tlscreds = nbd_get_tls_creds(tlscredsid, &local_err);
754 if (local_err) {
755 error_report("Failed to get TLS creds %s",
756 error_get_pretty(local_err));
757 exit(EXIT_FAILURE);
761 if (disconnect) {
762 int nbdfd = open(argv[optind], O_RDWR);
763 if (nbdfd < 0) {
764 error_report("Cannot open %s: %s", argv[optind],
765 strerror(errno));
766 exit(EXIT_FAILURE);
768 nbd_disconnect(nbdfd);
770 close(nbdfd);
772 printf("%s disconnected\n", argv[optind]);
774 return 0;
777 if (device && !verbose) {
778 int stderr_fd[2];
779 pid_t pid;
780 int ret;
782 if (qemu_pipe(stderr_fd) < 0) {
783 error_report("Error setting up communication pipe: %s",
784 strerror(errno));
785 exit(EXIT_FAILURE);
788 /* Now daemonize, but keep a communication channel open to
789 * print errors and exit with the proper status code.
791 pid = fork();
792 if (pid < 0) {
793 error_report("Failed to fork: %s", strerror(errno));
794 exit(EXIT_FAILURE);
795 } else if (pid == 0) {
796 close(stderr_fd[0]);
797 ret = qemu_daemon(1, 0);
799 /* Temporarily redirect stderr to the parent's pipe... */
800 dup2(stderr_fd[1], STDERR_FILENO);
801 if (ret < 0) {
802 error_report("Failed to daemonize: %s", strerror(errno));
803 exit(EXIT_FAILURE);
806 /* ... close the descriptor we inherited and go on. */
807 close(stderr_fd[1]);
808 } else {
809 bool errors = false;
810 char *buf;
812 /* In the parent. Print error messages from the child until
813 * it closes the pipe.
815 close(stderr_fd[1]);
816 buf = g_malloc(1024);
817 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
818 errors = true;
819 ret = qemu_write_full(STDERR_FILENO, buf, ret);
820 if (ret < 0) {
821 exit(EXIT_FAILURE);
824 if (ret < 0) {
825 error_report("Cannot read from daemon: %s",
826 strerror(errno));
827 exit(EXIT_FAILURE);
830 /* Usually the daemon should not print any message.
831 * Exit with zero status in that case.
833 exit(errors);
837 if (device != NULL && sockpath == NULL) {
838 sockpath = g_malloc(128);
839 snprintf(sockpath, 128, SOCKET_PATH, basename(device));
842 saddr = nbd_build_socket_address(sockpath, bindto, port);
844 if (qemu_init_main_loop(&local_err)) {
845 error_report_err(local_err);
846 exit(EXIT_FAILURE);
848 bdrv_init();
849 atexit(bdrv_close_all);
851 srcpath = argv[optind];
852 if (imageOpts) {
853 QemuOpts *opts;
854 if (fmt) {
855 error_report("--image-opts and -f are mutually exclusive");
856 exit(EXIT_FAILURE);
858 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
859 if (!opts) {
860 qemu_opts_reset(&file_opts);
861 exit(EXIT_FAILURE);
863 options = qemu_opts_to_qdict(opts, NULL);
864 qemu_opts_reset(&file_opts);
865 blk = blk_new_open(NULL, NULL, options, flags, &local_err);
866 } else {
867 if (fmt) {
868 options = qdict_new();
869 qdict_put(options, "driver", qstring_from_str(fmt));
871 blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
874 if (!blk) {
875 error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
876 argv[optind]);
877 exit(EXIT_FAILURE);
879 bs = blk_bs(blk);
881 blk_set_enable_write_cache(blk, !writethrough);
883 if (sn_opts) {
884 ret = bdrv_snapshot_load_tmp(bs,
885 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
886 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
887 &local_err);
888 } else if (sn_id_or_name) {
889 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
890 &local_err);
892 if (ret < 0) {
893 error_reportf_err(local_err, "Failed to load snapshot: ");
894 exit(EXIT_FAILURE);
897 bs->detect_zeroes = detect_zeroes;
898 fd_size = blk_getlength(blk);
899 if (fd_size < 0) {
900 error_report("Failed to determine the image length: %s",
901 strerror(-fd_size));
902 exit(EXIT_FAILURE);
905 if (dev_offset >= fd_size) {
906 error_report("Offset (%lld) has to be smaller than the image size "
907 "(%lld)",
908 (long long int)dev_offset, (long long int)fd_size);
909 exit(EXIT_FAILURE);
911 fd_size -= dev_offset;
913 if (partition != -1) {
914 ret = find_partition(blk, partition, &dev_offset, &fd_size);
915 if (ret < 0) {
916 error_report("Could not find partition %d: %s", partition,
917 strerror(-ret));
918 exit(EXIT_FAILURE);
922 exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed,
923 writethrough, NULL, &local_err);
924 if (!exp) {
925 error_report_err(local_err);
926 exit(EXIT_FAILURE);
928 if (export_name) {
929 nbd_export_set_name(exp, export_name);
930 newproto = true;
933 server_ioc = qio_channel_socket_new();
934 if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) {
935 object_unref(OBJECT(server_ioc));
936 error_report_err(local_err);
937 return 1;
940 if (device) {
941 int ret;
943 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
944 if (ret != 0) {
945 error_report("Failed to create client thread: %s", strerror(ret));
946 exit(EXIT_FAILURE);
948 } else {
949 /* Shut up GCC warnings. */
950 memset(&client_thread, 0, sizeof(client_thread));
953 nbd_update_server_watch();
955 /* now when the initialization is (almost) complete, chdir("/")
956 * to free any busy filesystems */
957 if (chdir("/") < 0) {
958 error_report("Could not chdir to root directory: %s",
959 strerror(errno));
960 exit(EXIT_FAILURE);
963 state = RUNNING;
964 do {
965 main_loop_wait(false);
966 if (state == TERMINATE) {
967 state = TERMINATING;
968 nbd_export_close(exp);
969 nbd_export_put(exp);
970 exp = NULL;
972 } while (state != TERMINATED);
974 blk_unref(blk);
975 if (sockpath) {
976 unlink(sockpath);
979 qemu_opts_del(sn_opts);
981 if (device) {
982 void *ret;
983 pthread_join(client_thread, &ret);
984 exit(ret != NULL);
985 } else {
986 exit(EXIT_SUCCESS);