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target/arm: Convert VFP comparison insns to decodetree
[qemu/ar7.git] / qemu-nbd.c
blobe24dd2f76766331374cb689996e684eb55b1e898
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 <getopt.h>
21 #include <libgen.h>
22 #include <pthread.h>
23
24 #include "qemu-common.h"
25 #include "qapi/error.h"
26 #include "qemu/cutils.h"
27 #include "sysemu/block-backend.h"
28 #include "block/block_int.h"
29 #include "block/nbd.h"
30 #include "qemu/main-loop.h"
31 #include "qemu/module.h"
32 #include "qemu/option.h"
33 #include "qemu/error-report.h"
34 #include "qemu/config-file.h"
35 #include "qemu/bswap.h"
36 #include "qemu/log.h"
37 #include "qemu/systemd.h"
38 #include "block/snapshot.h"
39 #include "qapi/qmp/qdict.h"
40 #include "qapi/qmp/qstring.h"
41 #include "qom/object_interfaces.h"
42 #include "io/channel-socket.h"
43 #include "io/net-listener.h"
44 #include "crypto/init.h"
45 #include "trace/control.h"
46 #include "qemu-version.h"
47
48 #ifdef __linux__
49 #define HAVE_NBD_DEVICE 1
50 #else
51 #define HAVE_NBD_DEVICE 0
52 #endif
53
54 #define SOCKET_PATH "/var/lock/qemu-nbd-%s"
55 #define QEMU_NBD_OPT_CACHE 256
56 #define QEMU_NBD_OPT_AIO 257
57 #define QEMU_NBD_OPT_DISCARD 258
58 #define QEMU_NBD_OPT_DETECT_ZEROES 259
59 #define QEMU_NBD_OPT_OBJECT 260
60 #define QEMU_NBD_OPT_TLSCREDS 261
61 #define QEMU_NBD_OPT_IMAGE_OPTS 262
62 #define QEMU_NBD_OPT_FORK 263
63 #define QEMU_NBD_OPT_TLSAUTHZ 264
64
65 #define MBR_SIZE 512
66
67 static NBDExport *export;
68 static int verbose;
69 static char *srcpath;
70 static SocketAddress *saddr;
71 static int persistent = 0;
72 static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state;
73 static int shared = 1;
74 static int nb_fds;
75 static QIONetListener *server;
76 static QCryptoTLSCreds *tlscreds;
77 static const char *tlsauthz;
78
79 static void usage(const char *name)
80 {
81 (printf) (
82 "Usage: %s [OPTIONS] FILE\n"
83 " or: %s -L [OPTIONS]\n"
84 "QEMU Disk Network Block Device Utility\n"
85 "\n"
86 " -h, --help display this help and exit\n"
87 " -V, --version output version information and exit\n"
88 "\n"
89 "Connection properties:\n"
90 " -p, --port=PORT port to listen on (default `%d')\n"
91 " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
92 " -k, --socket=PATH path to the unix socket\n"
93 " (default '"SOCKET_PATH"')\n"
94 " -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
95 " -t, --persistent don't exit on the last connection\n"
96 " -v, --verbose display extra debugging information\n"
97 " -x, --export-name=NAME expose export by name (default is empty string)\n"
98 " -D, --description=TEXT export a human-readable description\n"
99 "\n"
100 "Exposing part of the image:\n"
101 " -o, --offset=OFFSET offset into the image\n"
102 " -P, --partition=NUM only expose partition NUM\n"
103 " -B, --bitmap=NAME expose a persistent dirty bitmap\n"
104 "\n"
105 "General purpose options:\n"
106 " -L, --list list exports available from another NBD server\n"
107 " --object type,id=ID,... define an object such as 'secret' for providing\n"
108 " passwords and/or encryption keys\n"
109 " --tls-creds=ID use id of an earlier --object to provide TLS\n"
110 " --tls-authz=ID use id of an earlier --object to provide\n"
111 " authorization\n"
112 " -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
113 " specify tracing options\n"
114 " --fork fork off the server process and exit the parent\n"
115 " once the server is running\n"
116 #if HAVE_NBD_DEVICE
117 "\n"
118 "Kernel NBD client support:\n"
119 " -c, --connect=DEV connect FILE to the local NBD device DEV\n"
120 " -d, --disconnect disconnect the specified device\n"
121 #endif
122 "\n"
123 "Block device options:\n"
124 " -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
125 " -r, --read-only export read-only\n"
126 " -s, --snapshot use FILE as an external snapshot, create a temporary\n"
127 " file with backing_file=FILE, redirect the write to\n"
128 " the temporary one\n"
129 " -l, --load-snapshot=SNAPSHOT_PARAM\n"
130 " load an internal snapshot inside FILE and export it\n"
131 " as an read-only device, SNAPSHOT_PARAM format is\n"
132 " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
133 " '[ID_OR_NAME]'\n"
134 " -n, --nocache disable host cache\n"
135 " --cache=MODE set cache mode (none, writeback, ...)\n"
136 " --aio=MODE set AIO mode (native or threads)\n"
137 " --discard=MODE set discard mode (ignore, unmap)\n"
138 " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
139 " --image-opts treat FILE as a full set of image options\n"
140 "\n"
141 QEMU_HELP_BOTTOM "\n"
142 , name, name, NBD_DEFAULT_PORT, "DEVICE");
143 }
144
145 static void version(const char *name)
146 {
147 printf(
148 "%s " QEMU_FULL_VERSION "\n"
149 "Written by Anthony Liguori.\n"
150 "\n"
151 QEMU_COPYRIGHT "\n"
152 "This is free software; see the source for copying conditions. There is NO\n"
153 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
154 , name);
155 }
156
157 struct partition_record
158 {
159 uint8_t bootable;
160 uint8_t start_head;
161 uint32_t start_cylinder;
162 uint8_t start_sector;
163 uint8_t system;
164 uint8_t end_head;
165 uint8_t end_cylinder;
166 uint8_t end_sector;
167 uint32_t start_sector_abs;
168 uint32_t nb_sectors_abs;
169 };
170
171 static void read_partition(uint8_t *p, struct partition_record *r)
172 {
173 r->bootable = p[0];
174 r->start_head = p[1];
175 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300);
176 r->start_sector = p[2] & 0x3f;
177 r->system = p[4];
178 r->end_head = p[5];
179 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300);
180 r->end_sector = p[6] & 0x3f;
181
182 r->start_sector_abs = ldl_le_p(p + 8);
183 r->nb_sectors_abs = ldl_le_p(p + 12);
184 }
185
186 static int find_partition(BlockBackend *blk, int partition,
187 uint64_t *offset, uint64_t *size)
188 {
189 struct partition_record mbr[4];
190 uint8_t data[MBR_SIZE];
191 int i;
192 int ext_partnum = 4;
193 int ret;
194
195 ret = blk_pread(blk, 0, data, sizeof(data));
196 if (ret < 0) {
197 error_report("error while reading: %s", strerror(-ret));
198 exit(EXIT_FAILURE);
199 }
200
201 if (data[510] != 0x55 || data[511] != 0xaa) {
202 return -EINVAL;
203 }
204
205 for (i = 0; i < 4; i++) {
206 read_partition(&data[446 + 16 * i], &mbr[i]);
207
208 if (!mbr[i].system || !mbr[i].nb_sectors_abs) {
209 continue;
210 }
211
212 if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
213 struct partition_record ext[4];
214 uint8_t data1[MBR_SIZE];
215 int j;
216
217 ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE,
218 data1, sizeof(data1));
219 if (ret < 0) {
220 error_report("error while reading: %s", strerror(-ret));
221 exit(EXIT_FAILURE);
222 }
223
224 for (j = 0; j < 4; j++) {
225 read_partition(&data1[446 + 16 * j], &ext[j]);
226 if (!ext[j].system || !ext[j].nb_sectors_abs) {
227 continue;
228 }
229
230 if ((ext_partnum + j + 1) == partition) {
231 *offset = (uint64_t)ext[j].start_sector_abs << 9;
232 *size = (uint64_t)ext[j].nb_sectors_abs << 9;
233 return 0;
234 }
235 }
236 ext_partnum += 4;
237 } else if ((i + 1) == partition) {
238 *offset = (uint64_t)mbr[i].start_sector_abs << 9;
239 *size = (uint64_t)mbr[i].nb_sectors_abs << 9;
240 return 0;
241 }
242 }
243
244 return -ENOENT;
245 }
246
247 static void termsig_handler(int signum)
248 {
249 atomic_cmpxchg(&state, RUNNING, TERMINATE);
250 qemu_notify_event();
251 }
252
253
254 static int qemu_nbd_client_list(SocketAddress *saddr, QCryptoTLSCreds *tls,
255 const char *hostname)
256 {
257 int ret = EXIT_FAILURE;
258 int rc;
259 Error *err = NULL;
260 QIOChannelSocket *sioc;
261 NBDExportInfo *list;
262 int i, j;
263
264 sioc = qio_channel_socket_new();
265 if (qio_channel_socket_connect_sync(sioc, saddr, &err) < 0) {
266 error_report_err(err);
267 return EXIT_FAILURE;
268 }
269 rc = nbd_receive_export_list(QIO_CHANNEL(sioc), tls, hostname, &list,
270 &err);
271 if (rc < 0) {
272 if (err) {
273 error_report_err(err);
274 }
275 goto out;
276 }
277 printf("exports available: %d\n", rc);
278 for (i = 0; i < rc; i++) {
279 printf(" export: '%s'\n", list[i].name);
280 if (list[i].description && *list[i].description) {
281 printf(" description: %s\n", list[i].description);
282 }
283 if (list[i].flags & NBD_FLAG_HAS_FLAGS) {
284 static const char *const flag_names[] = {
285 [NBD_FLAG_READ_ONLY_BIT] = "readonly",
286 [NBD_FLAG_SEND_FLUSH_BIT] = "flush",
287 [NBD_FLAG_SEND_FUA_BIT] = "fua",
288 [NBD_FLAG_ROTATIONAL_BIT] = "rotational",
289 [NBD_FLAG_SEND_TRIM_BIT] = "trim",
290 [NBD_FLAG_SEND_WRITE_ZEROES_BIT] = "zeroes",
291 [NBD_FLAG_SEND_DF_BIT] = "df",
292 [NBD_FLAG_CAN_MULTI_CONN_BIT] = "multi",
293 [NBD_FLAG_SEND_RESIZE_BIT] = "resize",
294 [NBD_FLAG_SEND_CACHE_BIT] = "cache",
295 };
296
297 printf(" size: %" PRIu64 "\n", list[i].size);
298 printf(" flags: 0x%x (", list[i].flags);
299 for (size_t bit = 0; bit < ARRAY_SIZE(flag_names); bit++) {
300 if (flag_names[bit] && (list[i].flags & (1 << bit))) {
301 printf(" %s", flag_names[bit]);
302 }
303 }
304 printf(" )\n");
305 }
306 if (list[i].min_block) {
307 printf(" min block: %u\n", list[i].min_block);
308 printf(" opt block: %u\n", list[i].opt_block);
309 printf(" max block: %u\n", list[i].max_block);
310 }
311 if (list[i].n_contexts) {
312 printf(" available meta contexts: %d\n", list[i].n_contexts);
313 for (j = 0; j < list[i].n_contexts; j++) {
314 printf(" %s\n", list[i].contexts[j]);
315 }
316 }
317 }
318 nbd_free_export_list(list, rc);
319
320 ret = EXIT_SUCCESS;
321 out:
322 object_unref(OBJECT(sioc));
323 return ret;
324 }
325
326
327 #if HAVE_NBD_DEVICE
328 static void *show_parts(void *arg)
329 {
330 char *device = arg;
331 int nbd;
332
333 /* linux just needs an open() to trigger
334 * the partition table update
335 * but remember to load the module with max_part != 0 :
336 * modprobe nbd max_part=63
337 */
338 nbd = open(device, O_RDWR);
339 if (nbd >= 0) {
340 close(nbd);
341 }
342 return NULL;
343 }
344
345 static void *nbd_client_thread(void *arg)
346 {
347 char *device = arg;
348 NBDExportInfo info = { .request_sizes = false, .name = g_strdup("") };
349 QIOChannelSocket *sioc;
350 int fd;
351 int ret;
352 pthread_t show_parts_thread;
353 Error *local_error = NULL;
354
355 sioc = qio_channel_socket_new();
356 if (qio_channel_socket_connect_sync(sioc,
357 saddr,
358 &local_error) < 0) {
359 error_report_err(local_error);
360 goto out;
361 }
362
363 ret = nbd_receive_negotiate(QIO_CHANNEL(sioc),
364 NULL, NULL, NULL, &info, &local_error);
365 if (ret < 0) {
366 if (local_error) {
367 error_report_err(local_error);
368 }
369 goto out_socket;
370 }
371
372 fd = open(device, O_RDWR);
373 if (fd < 0) {
374 /* Linux-only, we can use %m in printf. */
375 error_report("Failed to open %s: %m", device);
376 goto out_socket;
377 }
378
379 ret = nbd_init(fd, sioc, &info, &local_error);
380 if (ret < 0) {
381 error_report_err(local_error);
382 goto out_fd;
383 }
384
385 /* update partition table */
386 pthread_create(&show_parts_thread, NULL, show_parts, device);
387
388 if (verbose) {
389 fprintf(stderr, "NBD device %s is now connected to %s\n",
390 device, srcpath);
391 } else {
392 /* Close stderr so that the qemu-nbd process exits. */
393 dup2(STDOUT_FILENO, STDERR_FILENO);
394 }
395
396 ret = nbd_client(fd);
397 if (ret) {
398 goto out_fd;
399 }
400 close(fd);
401 object_unref(OBJECT(sioc));
402 g_free(info.name);
403 kill(getpid(), SIGTERM);
404 return (void *) EXIT_SUCCESS;
405
406 out_fd:
407 close(fd);
408 out_socket:
409 object_unref(OBJECT(sioc));
410 out:
411 g_free(info.name);
412 kill(getpid(), SIGTERM);
413 return (void *) EXIT_FAILURE;
414 }
415 #endif /* HAVE_NBD_DEVICE */
416
417 static int nbd_can_accept(void)
418 {
419 return state == RUNNING && nb_fds < shared;
420 }
421
422 static void nbd_export_closed(NBDExport *export)
423 {
424 assert(state == TERMINATING);
425 state = TERMINATED;
426 }
427
428 static void nbd_update_server_watch(void);
429
430 static void nbd_client_closed(NBDClient *client, bool negotiated)
431 {
432 nb_fds--;
433 if (negotiated && nb_fds == 0 && !persistent && state == RUNNING) {
434 state = TERMINATE;
435 }
436 nbd_update_server_watch();
437 nbd_client_put(client);
438 }
439
440 static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc,
441 gpointer opaque)
442 {
443 if (state >= TERMINATE) {
444 return;
445 }
446
447 nb_fds++;
448 nbd_update_server_watch();
449 nbd_client_new(cioc, tlscreds, tlsauthz, nbd_client_closed);
450 }
451
452 static void nbd_update_server_watch(void)
453 {
454 if (nbd_can_accept()) {
455 qio_net_listener_set_client_func(server, nbd_accept, NULL, NULL);
456 } else {
457 qio_net_listener_set_client_func(server, NULL, NULL, NULL);
458 }
459 }
460
461
462 static SocketAddress *nbd_build_socket_address(const char *sockpath,
463 const char *bindto,
464 const char *port)
465 {
466 SocketAddress *saddr;
467
468 saddr = g_new0(SocketAddress, 1);
469 if (sockpath) {
470 saddr->type = SOCKET_ADDRESS_TYPE_UNIX;
471 saddr->u.q_unix.path = g_strdup(sockpath);
472 } else {
473 InetSocketAddress *inet;
474 saddr->type = SOCKET_ADDRESS_TYPE_INET;
475 inet = &saddr->u.inet;
476 inet->host = g_strdup(bindto);
477 if (port) {
478 inet->port = g_strdup(port);
479 } else {
480 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
481 }
482 }
483
484 return saddr;
485 }
486
487
488 static QemuOptsList file_opts = {
489 .name = "file",
490 .implied_opt_name = "file",
491 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
492 .desc = {
493 /* no elements => accept any params */
494 { /* end of list */ }
495 },
496 };
497
498 static QemuOptsList qemu_object_opts = {
499 .name = "object",
500 .implied_opt_name = "qom-type",
501 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
502 .desc = {
503 { }
504 },
505 };
506
507
508
509 static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, bool list,
510 Error **errp)
511 {
512 Object *obj;
513 QCryptoTLSCreds *creds;
514
515 obj = object_resolve_path_component(
516 object_get_objects_root(), id);
517 if (!obj) {
518 error_setg(errp, "No TLS credentials with id '%s'",
519 id);
520 return NULL;
521 }
522 creds = (QCryptoTLSCreds *)
523 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
524 if (!creds) {
525 error_setg(errp, "Object with id '%s' is not TLS credentials",
526 id);
527 return NULL;
528 }
529
530 if (list) {
531 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) {
532 error_setg(errp,
533 "Expecting TLS credentials with a client endpoint");
534 return NULL;
535 }
536 } else {
537 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
538 error_setg(errp,
539 "Expecting TLS credentials with a server endpoint");
540 return NULL;
541 }
542 }
543 object_ref(obj);
544 return creds;
545 }
546
547 static void setup_address_and_port(const char **address, const char **port)
548 {
549 if (*address == NULL) {
550 *address = "0.0.0.0";
551 }
552
553 if (*port == NULL) {
554 *port = stringify(NBD_DEFAULT_PORT);
555 }
556 }
557
558 /*
559 * Check socket parameters compatibility when socket activation is used.
560 */
561 static const char *socket_activation_validate_opts(const char *device,
562 const char *sockpath,
563 const char *address,
564 const char *port,
565 bool list)
566 {
567 if (device != NULL) {
568 return "NBD device can't be set when using socket activation";
569 }
570
571 if (sockpath != NULL) {
572 return "Unix socket can't be set when using socket activation";
573 }
574
575 if (address != NULL) {
576 return "The interface can't be set when using socket activation";
577 }
578
579 if (port != NULL) {
580 return "TCP port number can't be set when using socket activation";
581 }
582
583 if (list) {
584 return "List mode is incompatible with socket activation";
585 }
586
587 return NULL;
588 }
589
590 static void qemu_nbd_shutdown(void)
591 {
592 job_cancel_sync_all();
593 bdrv_close_all();
594 }
595
596 int main(int argc, char **argv)
597 {
598 BlockBackend *blk;
599 BlockDriverState *bs;
600 uint64_t dev_offset = 0;
601 uint16_t nbdflags = 0;
602 bool disconnect = false;
603 const char *bindto = NULL;
604 const char *port = NULL;
605 char *sockpath = NULL;
606 char *device = NULL;
607 int64_t fd_size;
608 QemuOpts *sn_opts = NULL;
609 const char *sn_id_or_name = NULL;
610 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:D:B:L";
611 struct option lopt[] = {
612 { "help", no_argument, NULL, 'h' },
613 { "version", no_argument, NULL, 'V' },
614 { "bind", required_argument, NULL, 'b' },
615 { "port", required_argument, NULL, 'p' },
616 { "socket", required_argument, NULL, 'k' },
617 { "offset", required_argument, NULL, 'o' },
618 { "read-only", no_argument, NULL, 'r' },
619 { "partition", required_argument, NULL, 'P' },
620 { "bitmap", required_argument, NULL, 'B' },
621 { "connect", required_argument, NULL, 'c' },
622 { "disconnect", no_argument, NULL, 'd' },
623 { "list", no_argument, NULL, 'L' },
624 { "snapshot", no_argument, NULL, 's' },
625 { "load-snapshot", required_argument, NULL, 'l' },
626 { "nocache", no_argument, NULL, 'n' },
627 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE },
628 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO },
629 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD },
630 { "detect-zeroes", required_argument, NULL,
631 QEMU_NBD_OPT_DETECT_ZEROES },
632 { "shared", required_argument, NULL, 'e' },
633 { "format", required_argument, NULL, 'f' },
634 { "persistent", no_argument, NULL, 't' },
635 { "verbose", no_argument, NULL, 'v' },
636 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT },
637 { "export-name", required_argument, NULL, 'x' },
638 { "description", required_argument, NULL, 'D' },
639 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS },
640 { "tls-authz", required_argument, NULL, QEMU_NBD_OPT_TLSAUTHZ },
641 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
642 { "trace", required_argument, NULL, 'T' },
643 { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK },
644 { NULL, 0, NULL, 0 }
645 };
646 int ch;
647 int opt_ind = 0;
648 int flags = BDRV_O_RDWR;
649 int partition = 0;
650 int ret = 0;
651 bool seen_cache = false;
652 bool seen_discard = false;
653 bool seen_aio = false;
654 pthread_t client_thread;
655 const char *fmt = NULL;
656 Error *local_err = NULL;
657 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
658 QDict *options = NULL;
659 const char *export_name = NULL; /* defaults to "" later for server mode */
660 const char *export_description = NULL;
661 const char *bitmap = NULL;
662 const char *tlscredsid = NULL;
663 bool imageOpts = false;
664 bool writethrough = true;
665 char *trace_file = NULL;
666 bool fork_process = false;
667 bool list = false;
668 int old_stderr = -1;
669 unsigned socket_activation;
670
671 /* The client thread uses SIGTERM to interrupt the server. A signal
672 * handler ensures that "qemu-nbd -v -c" exits with a nice status code.
673 */
674 struct sigaction sa_sigterm;
675 memset(&sa_sigterm, 0, sizeof(sa_sigterm));
676 sa_sigterm.sa_handler = termsig_handler;
677 sigaction(SIGTERM, &sa_sigterm, NULL);
678
679 #ifdef CONFIG_POSIX
680 signal(SIGPIPE, SIG_IGN);
681 #endif
682
683 error_init(argv[0]);
684 module_call_init(MODULE_INIT_TRACE);
685 qcrypto_init(&error_fatal);
686
687 module_call_init(MODULE_INIT_QOM);
688 qemu_add_opts(&qemu_object_opts);
689 qemu_add_opts(&qemu_trace_opts);
690 qemu_init_exec_dir(argv[0]);
691
692 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
693 switch (ch) {
694 case 's':
695 flags |= BDRV_O_SNAPSHOT;
696 break;
697 case 'n':
698 optarg = (char *) "none";
699 /* fallthrough */
700 case QEMU_NBD_OPT_CACHE:
701 if (seen_cache) {
702 error_report("-n and --cache can only be specified once");
703 exit(EXIT_FAILURE);
704 }
705 seen_cache = true;
706 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) {
707 error_report("Invalid cache mode `%s'", optarg);
708 exit(EXIT_FAILURE);
709 }
710 break;
711 case QEMU_NBD_OPT_AIO:
712 if (seen_aio) {
713 error_report("--aio can only be specified once");
714 exit(EXIT_FAILURE);
715 }
716 seen_aio = true;
717 if (!strcmp(optarg, "native")) {
718 flags |= BDRV_O_NATIVE_AIO;
719 } else if (!strcmp(optarg, "threads")) {
720 /* this is the default */
721 } else {
722 error_report("invalid aio mode `%s'", optarg);
723 exit(EXIT_FAILURE);
724 }
725 break;
726 case QEMU_NBD_OPT_DISCARD:
727 if (seen_discard) {
728 error_report("--discard can only be specified once");
729 exit(EXIT_FAILURE);
730 }
731 seen_discard = true;
732 if (bdrv_parse_discard_flags(optarg, &flags) == -1) {
733 error_report("Invalid discard mode `%s'", optarg);
734 exit(EXIT_FAILURE);
735 }
736 break;
737 case QEMU_NBD_OPT_DETECT_ZEROES:
738 detect_zeroes =
739 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
740 optarg,
741 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
742 &local_err);
743 if (local_err) {
744 error_reportf_err(local_err,
745 "Failed to parse detect_zeroes mode: ");
746 exit(EXIT_FAILURE);
747 }
748 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
749 !(flags & BDRV_O_UNMAP)) {
750 error_report("setting detect-zeroes to unmap is not allowed "
751 "without setting discard operation to unmap");
752 exit(EXIT_FAILURE);
753 }
754 break;
755 case 'b':
756 bindto = optarg;
757 break;
758 case 'p':
759 port = optarg;
760 break;
761 case 'o':
762 if (qemu_strtou64(optarg, NULL, 0, &dev_offset) < 0) {
763 error_report("Invalid offset '%s'", optarg);
764 exit(EXIT_FAILURE);
765 }
766 break;
767 case 'l':
768 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
769 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
770 optarg, false);
771 if (!sn_opts) {
772 error_report("Failed in parsing snapshot param `%s'",
773 optarg);
774 exit(EXIT_FAILURE);
775 }
776 } else {
777 sn_id_or_name = optarg;
778 }
779 /* fall through */
780 case 'r':
781 nbdflags |= NBD_FLAG_READ_ONLY;
782 flags &= ~BDRV_O_RDWR;
783 break;
784 case 'P':
785 warn_report("The '-P' option is deprecated; use --image-opts with "
786 "a raw device wrapper for subset exports instead");
787 if (qemu_strtoi(optarg, NULL, 0, &partition) < 0 ||
788 partition < 1 || partition > 8) {
789 error_report("Invalid partition '%s'", optarg);
790 exit(EXIT_FAILURE);
791 }
792 break;
793 case 'B':
794 bitmap = optarg;
795 break;
796 case 'k':
797 sockpath = optarg;
798 if (sockpath[0] != '/') {
799 error_report("socket path must be absolute");
800 exit(EXIT_FAILURE);
801 }
802 break;
803 case 'd':
804 disconnect = true;
805 break;
806 case 'c':
807 device = optarg;
808 break;
809 case 'e':
810 if (qemu_strtoi(optarg, NULL, 0, &shared) < 0 ||
811 shared < 1) {
812 error_report("Invalid shared device number '%s'", optarg);
813 exit(EXIT_FAILURE);
814 }
815 break;
816 case 'f':
817 fmt = optarg;
818 break;
819 case 't':
820 persistent = 1;
821 break;
822 case 'x':
823 export_name = optarg;
824 break;
825 case 'D':
826 export_description = optarg;
827 break;
828 case 'v':
829 verbose = 1;
830 break;
831 case 'V':
832 version(argv[0]);
833 exit(0);
834 break;
835 case 'h':
836 usage(argv[0]);
837 exit(0);
838 break;
839 case '?':
840 error_report("Try `%s --help' for more information.", argv[0]);
841 exit(EXIT_FAILURE);
842 case QEMU_NBD_OPT_OBJECT: {
843 QemuOpts *opts;
844 opts = qemu_opts_parse_noisily(&qemu_object_opts,
845 optarg, true);
846 if (!opts) {
847 exit(EXIT_FAILURE);
848 }
849 } break;
850 case QEMU_NBD_OPT_TLSCREDS:
851 tlscredsid = optarg;
852 break;
853 case QEMU_NBD_OPT_IMAGE_OPTS:
854 imageOpts = true;
855 break;
856 case 'T':
857 g_free(trace_file);
858 trace_file = trace_opt_parse(optarg);
859 break;
860 case QEMU_NBD_OPT_TLSAUTHZ:
861 tlsauthz = optarg;
862 break;
863 case QEMU_NBD_OPT_FORK:
864 fork_process = true;
865 break;
866 case 'L':
867 list = true;
868 break;
869 }
870 }
871
872 if (list) {
873 if (argc != optind) {
874 error_report("List mode is incompatible with a file name");
875 exit(EXIT_FAILURE);
876 }
877 if (export_name || export_description || dev_offset || partition ||
878 device || disconnect || fmt || sn_id_or_name || bitmap ||
879 seen_aio || seen_discard || seen_cache) {
880 error_report("List mode is incompatible with per-device settings");
881 exit(EXIT_FAILURE);
882 }
883 if (fork_process) {
884 error_report("List mode is incompatible with forking");
885 exit(EXIT_FAILURE);
886 }
887 } else if ((argc - optind) != 1) {
888 error_report("Invalid number of arguments");
889 error_printf("Try `%s --help' for more information.\n", argv[0]);
890 exit(EXIT_FAILURE);
891 } else if (!export_name) {
892 export_name = "";
893 }
894
895 qemu_opts_foreach(&qemu_object_opts,
896 user_creatable_add_opts_foreach,
897 NULL, &error_fatal);
898
899 if (!trace_init_backends()) {
900 exit(1);
901 }
902 trace_init_file(trace_file);
903 qemu_set_log(LOG_TRACE);
904
905 socket_activation = check_socket_activation();
906 if (socket_activation == 0) {
907 setup_address_and_port(&bindto, &port);
908 } else {
909 /* Using socket activation - check user didn't use -p etc. */
910 const char *err_msg = socket_activation_validate_opts(device, sockpath,
911 bindto, port,
912 list);
913 if (err_msg != NULL) {
914 error_report("%s", err_msg);
915 exit(EXIT_FAILURE);
916 }
917
918 /* qemu-nbd can only listen on a single socket. */
919 if (socket_activation > 1) {
920 error_report("qemu-nbd does not support socket activation with %s > 1",
921 "LISTEN_FDS");
922 exit(EXIT_FAILURE);
923 }
924 }
925
926 if (tlscredsid) {
927 if (sockpath) {
928 error_report("TLS is only supported with IPv4/IPv6");
929 exit(EXIT_FAILURE);
930 }
931 if (device) {
932 error_report("TLS is not supported with a host device");
933 exit(EXIT_FAILURE);
934 }
935 if (tlsauthz && list) {
936 error_report("TLS authorization is incompatible with export list");
937 exit(EXIT_FAILURE);
938 }
939 tlscreds = nbd_get_tls_creds(tlscredsid, list, &local_err);
940 if (local_err) {
941 error_report("Failed to get TLS creds %s",
942 error_get_pretty(local_err));
943 exit(EXIT_FAILURE);
944 }
945 } else {
946 if (tlsauthz) {
947 error_report("--tls-authz is not permitted without --tls-creds");
948 exit(EXIT_FAILURE);
949 }
950 }
951
952 if (list) {
953 saddr = nbd_build_socket_address(sockpath, bindto, port);
954 return qemu_nbd_client_list(saddr, tlscreds, bindto);
955 }
956
957 #if !HAVE_NBD_DEVICE
958 if (disconnect || device) {
959 error_report("Kernel /dev/nbdN support not available");
960 exit(EXIT_FAILURE);
961 }
962 #else /* HAVE_NBD_DEVICE */
963 if (disconnect) {
964 int nbdfd = open(argv[optind], O_RDWR);
965 if (nbdfd < 0) {
966 error_report("Cannot open %s: %s", argv[optind],
967 strerror(errno));
968 exit(EXIT_FAILURE);
969 }
970 nbd_disconnect(nbdfd);
971
972 close(nbdfd);
973
974 printf("%s disconnected\n", argv[optind]);
975
976 return 0;
977 }
978 #endif
979
980 if ((device && !verbose) || fork_process) {
981 int stderr_fd[2];
982 pid_t pid;
983 int ret;
984
985 if (qemu_pipe(stderr_fd) < 0) {
986 error_report("Error setting up communication pipe: %s",
987 strerror(errno));
988 exit(EXIT_FAILURE);
989 }
990
991 /* Now daemonize, but keep a communication channel open to
992 * print errors and exit with the proper status code.
993 */
994 pid = fork();
995 if (pid < 0) {
996 error_report("Failed to fork: %s", strerror(errno));
997 exit(EXIT_FAILURE);
998 } else if (pid == 0) {
999 close(stderr_fd[0]);
1000 ret = qemu_daemon(1, 0);
1001
1002 /* Temporarily redirect stderr to the parent's pipe... */
1003 old_stderr = dup(STDERR_FILENO);
1004 dup2(stderr_fd[1], STDERR_FILENO);
1005 if (ret < 0) {
1006 error_report("Failed to daemonize: %s", strerror(errno));
1007 exit(EXIT_FAILURE);
1008 }
1009
1010 /* ... close the descriptor we inherited and go on. */
1011 close(stderr_fd[1]);
1012 } else {
1013 bool errors = false;
1014 char *buf;
1015
1016 /* In the parent. Print error messages from the child until
1017 * it closes the pipe.
1018 */
1019 close(stderr_fd[1]);
1020 buf = g_malloc(1024);
1021 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
1022 errors = true;
1023 ret = qemu_write_full(STDERR_FILENO, buf, ret);
1024 if (ret < 0) {
1025 exit(EXIT_FAILURE);
1026 }
1027 }
1028 if (ret < 0) {
1029 error_report("Cannot read from daemon: %s",
1030 strerror(errno));
1031 exit(EXIT_FAILURE);
1032 }
1033
1034 /* Usually the daemon should not print any message.
1035 * Exit with zero status in that case.
1036 */
1037 exit(errors);
1038 }
1039 }
1040
1041 if (device != NULL && sockpath == NULL) {
1042 sockpath = g_malloc(128);
1043 snprintf(sockpath, 128, SOCKET_PATH, basename(device));
1044 }
1045
1046 server = qio_net_listener_new();
1047 if (socket_activation == 0) {
1048 saddr = nbd_build_socket_address(sockpath, bindto, port);
1049 if (qio_net_listener_open_sync(server, saddr, &local_err) < 0) {
1050 object_unref(OBJECT(server));
1051 error_report_err(local_err);
1052 exit(EXIT_FAILURE);
1053 }
1054 } else {
1055 size_t i;
1056 /* See comment in check_socket_activation above. */
1057 for (i = 0; i < socket_activation; i++) {
1058 QIOChannelSocket *sioc;
1059 sioc = qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD + i,
1060 &local_err);
1061 if (sioc == NULL) {
1062 object_unref(OBJECT(server));
1063 error_report("Failed to use socket activation: %s",
1064 error_get_pretty(local_err));
1065 exit(EXIT_FAILURE);
1066 }
1067 qio_net_listener_add(server, sioc);
1068 object_unref(OBJECT(sioc));
1069 }
1070 }
1071
1072 if (qemu_init_main_loop(&local_err)) {
1073 error_report_err(local_err);
1074 exit(EXIT_FAILURE);
1075 }
1076 bdrv_init();
1077 atexit(qemu_nbd_shutdown);
1078
1079 srcpath = argv[optind];
1080 if (imageOpts) {
1081 QemuOpts *opts;
1082 if (fmt) {
1083 error_report("--image-opts and -f are mutually exclusive");
1084 exit(EXIT_FAILURE);
1085 }
1086 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
1087 if (!opts) {
1088 qemu_opts_reset(&file_opts);
1089 exit(EXIT_FAILURE);
1090 }
1091 options = qemu_opts_to_qdict(opts, NULL);
1092 qemu_opts_reset(&file_opts);
1093 blk = blk_new_open(NULL, NULL, options, flags, &local_err);
1094 } else {
1095 if (fmt) {
1096 options = qdict_new();
1097 qdict_put_str(options, "driver", fmt);
1098 }
1099 blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
1100 }
1101
1102 if (!blk) {
1103 error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
1104 argv[optind]);
1105 exit(EXIT_FAILURE);
1106 }
1107 bs = blk_bs(blk);
1108
1109 blk_set_enable_write_cache(blk, !writethrough);
1110
1111 if (sn_opts) {
1112 ret = bdrv_snapshot_load_tmp(bs,
1113 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
1114 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
1115 &local_err);
1116 } else if (sn_id_or_name) {
1117 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
1118 &local_err);
1119 }
1120 if (ret < 0) {
1121 error_reportf_err(local_err, "Failed to load snapshot: ");
1122 exit(EXIT_FAILURE);
1123 }
1124
1125 bs->detect_zeroes = detect_zeroes;
1126 fd_size = blk_getlength(blk);
1127 if (fd_size < 0) {
1128 error_report("Failed to determine the image length: %s",
1129 strerror(-fd_size));
1130 exit(EXIT_FAILURE);
1131 }
1132
1133 if (dev_offset >= fd_size) {
1134 error_report("Offset (%" PRIu64 ") has to be smaller than the image "
1135 "size (%" PRId64 ")", dev_offset, fd_size);
1136 exit(EXIT_FAILURE);
1137 }
1138 fd_size -= dev_offset;
1139
1140 if (partition) {
1141 uint64_t limit;
1142
1143 if (dev_offset) {
1144 error_report("Cannot request partition and offset together");
1145 exit(EXIT_FAILURE);
1146 }
1147 ret = find_partition(blk, partition, &dev_offset, &limit);
1148 if (ret < 0) {
1149 error_report("Could not find partition %d: %s", partition,
1150 strerror(-ret));
1151 exit(EXIT_FAILURE);
1152 }
1153 /*
1154 * MBR partition limits are (32-bit << 9); this assert lets
1155 * the compiler know that we can't overflow 64 bits.
1156 */
1157 assert(dev_offset + limit >= dev_offset);
1158 if (dev_offset + limit > fd_size) {
1159 error_report("Discovered partition %d at offset %" PRIu64
1160 " size %" PRIu64 ", but size exceeds file length %"
1161 PRId64, partition, dev_offset, limit, fd_size);
1162 exit(EXIT_FAILURE);
1163 }
1164 fd_size = limit;
1165 }
1166
1167 export = nbd_export_new(bs, dev_offset, fd_size, export_name,
1168 export_description, bitmap, nbdflags,
1169 nbd_export_closed, writethrough, NULL,
1170 &error_fatal);
1171
1172 if (device) {
1173 #if HAVE_NBD_DEVICE
1174 int ret;
1175
1176 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
1177 if (ret != 0) {
1178 error_report("Failed to create client thread: %s", strerror(ret));
1179 exit(EXIT_FAILURE);
1180 }
1181 #endif
1182 } else {
1183 /* Shut up GCC warnings. */
1184 memset(&client_thread, 0, sizeof(client_thread));
1185 }
1186
1187 nbd_update_server_watch();
1188
1189 /* now when the initialization is (almost) complete, chdir("/")
1190 * to free any busy filesystems */
1191 if (chdir("/") < 0) {
1192 error_report("Could not chdir to root directory: %s",
1193 strerror(errno));
1194 exit(EXIT_FAILURE);
1195 }
1196
1197 if (fork_process) {
1198 dup2(old_stderr, STDERR_FILENO);
1199 close(old_stderr);
1200 }
1201
1202 state = RUNNING;
1203 do {
1204 main_loop_wait(false);
1205 if (state == TERMINATE) {
1206 state = TERMINATING;
1207 nbd_export_close(export);
1208 nbd_export_put(export);
1209 export = NULL;
1210 }
1211 } while (state != TERMINATED);
1212
1213 blk_unref(blk);
1214 if (sockpath) {
1215 unlink(sockpath);
1216 }
1217
1218 qemu_opts_del(sn_opts);
1219
1220 if (device) {
1221 void *ret;
1222 pthread_join(client_thread, &ret);
1223 exit(ret != NULL);
1224 } else {
1225 exit(EXIT_SUCCESS);
1226 }
1227 }
AR7 emulation for QEMU