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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 "qapi/error.h" | |
25 | #include "qemu/cutils.h" | |
26 | #include "sysemu/block-backend.h" | |
27 | #include "block/block_int.h" | |
28 | #include "block/nbd.h" | |
29 | #include "qemu/main-loop.h" | |
30 | #include "qemu/option.h" | |
31 | #include "qemu/error-report.h" | |
32 | #include "qemu/config-file.h" | |
33 | #include "qemu/bswap.h" | |
34 | #include "qemu/log.h" | |
35 | #include "qemu/systemd.h" | |
36 | #include "block/snapshot.h" | |
37 | #include "qapi/qmp/qdict.h" | |
38 | #include "qapi/qmp/qstring.h" | |
39 | #include "qom/object_interfaces.h" | |
40 | #include "io/channel-socket.h" | |
41 | #include "io/net-listener.h" | |
42 | #include "crypto/init.h" | |
43 | #include "trace/control.h" | |
44 | #include "qemu-version.h" | |
45 | ||
46 | #ifdef __linux__ | |
47 | #define HAVE_NBD_DEVICE 1 | |
48 | #else | |
49 | #define HAVE_NBD_DEVICE 0 | |
50 | #endif | |
51 | ||
52 | #define SOCKET_PATH "/var/lock/qemu-nbd-%s" | |
53 | #define QEMU_NBD_OPT_CACHE 256 | |
54 | #define QEMU_NBD_OPT_AIO 257 | |
55 | #define QEMU_NBD_OPT_DISCARD 258 | |
56 | #define QEMU_NBD_OPT_DETECT_ZEROES 259 | |
57 | #define QEMU_NBD_OPT_OBJECT 260 | |
58 | #define QEMU_NBD_OPT_TLSCREDS 261 | |
59 | #define QEMU_NBD_OPT_IMAGE_OPTS 262 | |
60 | #define QEMU_NBD_OPT_FORK 263 | |
61 | #define QEMU_NBD_OPT_TLSAUTHZ 264 | |
62 | ||
63 | #define MBR_SIZE 512 | |
64 | ||
65 | static NBDExport *export; | |
66 | static int verbose; | |
67 | static char *srcpath; | |
68 | static SocketAddress *saddr; | |
69 | static int persistent = 0; | |
70 | static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state; | |
71 | static int shared = 1; | |
72 | static int nb_fds; | |
73 | static QIONetListener *server; | |
74 | static QCryptoTLSCreds *tlscreds; | |
75 | static const char *tlsauthz; | |
76 | ||
77 | static void usage(const char *name) | |
78 | { | |
79 | (printf) ( | |
80 | "Usage: %s [OPTIONS] FILE\n" | |
81 | " or: %s -L [OPTIONS]\n" | |
82 | "QEMU Disk Network Block Device Utility\n" | |
83 | "\n" | |
84 | " -h, --help display this help and exit\n" | |
85 | " -V, --version output version information and exit\n" | |
86 | "\n" | |
87 | "Connection properties:\n" | |
88 | " -p, --port=PORT port to listen on (default `%d')\n" | |
89 | " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" | |
90 | " -k, --socket=PATH path to the unix socket\n" | |
91 | " (default '"SOCKET_PATH"')\n" | |
92 | " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" | |
93 | " -t, --persistent don't exit on the last connection\n" | |
94 | " -v, --verbose display extra debugging information\n" | |
95 | " -x, --export-name=NAME expose export by name (default is empty string)\n" | |
96 | " -D, --description=TEXT export a human-readable description\n" | |
97 | "\n" | |
98 | "Exposing part of the image:\n" | |
99 | " -o, --offset=OFFSET offset into the image\n" | |
100 | " -P, --partition=NUM only expose partition NUM\n" | |
101 | " -B, --bitmap=NAME expose a persistent dirty bitmap\n" | |
102 | "\n" | |
103 | "General purpose options:\n" | |
104 | " -L, --list list exports available from another NBD server\n" | |
105 | " --object type,id=ID,... define an object such as 'secret' for providing\n" | |
106 | " passwords and/or encryption keys\n" | |
107 | " --tls-creds=ID use id of an earlier --object to provide TLS\n" | |
108 | " --tls-authz=ID use id of an earlier --object to provide\n" | |
109 | " authorization\n" | |
110 | " -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n" | |
111 | " specify tracing options\n" | |
112 | " --fork fork off the server process and exit the parent\n" | |
113 | " once the server is running\n" | |
114 | #if HAVE_NBD_DEVICE | |
115 | "\n" | |
116 | "Kernel NBD client support:\n" | |
117 | " -c, --connect=DEV connect FILE to the local NBD device DEV\n" | |
118 | " -d, --disconnect disconnect the specified device\n" | |
119 | #endif | |
120 | "\n" | |
121 | "Block device options:\n" | |
122 | " -f, --format=FORMAT set image format (raw, qcow2, ...)\n" | |
123 | " -r, --read-only export read-only\n" | |
124 | " -s, --snapshot use FILE as an external snapshot, create a temporary\n" | |
125 | " file with backing_file=FILE, redirect the write to\n" | |
126 | " the temporary one\n" | |
127 | " -l, --load-snapshot=SNAPSHOT_PARAM\n" | |
128 | " load an internal snapshot inside FILE and export it\n" | |
129 | " as an read-only device, SNAPSHOT_PARAM format is\n" | |
130 | " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n" | |
131 | " '[ID_OR_NAME]'\n" | |
132 | " -n, --nocache disable host cache\n" | |
133 | " --cache=MODE set cache mode (none, writeback, ...)\n" | |
134 | " --aio=MODE set AIO mode (native or threads)\n" | |
135 | " --discard=MODE set discard mode (ignore, unmap)\n" | |
136 | " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n" | |
137 | " --image-opts treat FILE as a full set of image options\n" | |
138 | "\n" | |
139 | QEMU_HELP_BOTTOM "\n" | |
140 | , name, name, NBD_DEFAULT_PORT, "DEVICE"); | |
141 | } | |
142 | ||
143 | static void version(const char *name) | |
144 | { | |
145 | printf( | |
146 | "%s " QEMU_FULL_VERSION "\n" | |
147 | "Written by Anthony Liguori.\n" | |
148 | "\n" | |
149 | QEMU_COPYRIGHT "\n" | |
150 | "This is free software; see the source for copying conditions. There is NO\n" | |
151 | "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" | |
152 | , name); | |
153 | } | |
154 | ||
155 | struct partition_record | |
156 | { | |
157 | uint8_t bootable; | |
158 | uint8_t start_head; | |
159 | uint32_t start_cylinder; | |
160 | uint8_t start_sector; | |
161 | uint8_t system; | |
162 | uint8_t end_head; | |
163 | uint8_t end_cylinder; | |
164 | uint8_t end_sector; | |
165 | uint32_t start_sector_abs; | |
166 | uint32_t nb_sectors_abs; | |
167 | }; | |
168 | ||
169 | static void read_partition(uint8_t *p, struct partition_record *r) | |
170 | { | |
171 | r->bootable = p[0]; | |
172 | r->start_head = p[1]; | |
173 | r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); | |
174 | r->start_sector = p[2] & 0x3f; | |
175 | r->system = p[4]; | |
176 | r->end_head = p[5]; | |
177 | r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); | |
178 | r->end_sector = p[6] & 0x3f; | |
179 | ||
180 | r->start_sector_abs = ldl_le_p(p + 8); | |
181 | r->nb_sectors_abs = ldl_le_p(p + 12); | |
182 | } | |
183 | ||
184 | static int find_partition(BlockBackend *blk, int partition, | |
185 | uint64_t *offset, uint64_t *size) | |
186 | { | |
187 | struct partition_record mbr[4]; | |
188 | uint8_t data[MBR_SIZE]; | |
189 | int i; | |
190 | int ext_partnum = 4; | |
191 | int ret; | |
192 | ||
193 | ret = blk_pread(blk, 0, data, sizeof(data)); | |
194 | if (ret < 0) { | |
195 | error_report("error while reading: %s", strerror(-ret)); | |
196 | exit(EXIT_FAILURE); | |
197 | } | |
198 | ||
199 | if (data[510] != 0x55 || data[511] != 0xaa) { | |
200 | return -EINVAL; | |
201 | } | |
202 | ||
203 | for (i = 0; i < 4; i++) { | |
204 | read_partition(&data[446 + 16 * i], &mbr[i]); | |
205 | ||
206 | if (!mbr[i].system || !mbr[i].nb_sectors_abs) { | |
207 | continue; | |
208 | } | |
209 | ||
210 | if (mbr[i].system == 0xF || mbr[i].system == 0x5) { | |
211 | struct partition_record ext[4]; | |
212 | uint8_t data1[MBR_SIZE]; | |
213 | int j; | |
214 | ||
215 | ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE, | |
216 | data1, sizeof(data1)); | |
217 | if (ret < 0) { | |
218 | error_report("error while reading: %s", strerror(-ret)); | |
219 | exit(EXIT_FAILURE); | |
220 | } | |
221 | ||
222 | for (j = 0; j < 4; j++) { | |
223 | read_partition(&data1[446 + 16 * j], &ext[j]); | |
224 | if (!ext[j].system || !ext[j].nb_sectors_abs) { | |
225 | continue; | |
226 | } | |
227 | ||
228 | if ((ext_partnum + j + 1) == partition) { | |
229 | *offset = (uint64_t)ext[j].start_sector_abs << 9; | |
230 | *size = (uint64_t)ext[j].nb_sectors_abs << 9; | |
231 | return 0; | |
232 | } | |
233 | } | |
234 | ext_partnum += 4; | |
235 | } else if ((i + 1) == partition) { | |
236 | *offset = (uint64_t)mbr[i].start_sector_abs << 9; | |
237 | *size = (uint64_t)mbr[i].nb_sectors_abs << 9; | |
238 | return 0; | |
239 | } | |
240 | } | |
241 | ||
242 | return -ENOENT; | |
243 | } | |
244 | ||
245 | static void termsig_handler(int signum) | |
246 | { | |
247 | atomic_cmpxchg(&state, RUNNING, TERMINATE); | |
248 | qemu_notify_event(); | |
249 | } | |
250 | ||
251 | ||
252 | static int qemu_nbd_client_list(SocketAddress *saddr, QCryptoTLSCreds *tls, | |
253 | const char *hostname) | |
254 | { | |
255 | int ret = EXIT_FAILURE; | |
256 | int rc; | |
257 | Error *err = NULL; | |
258 | QIOChannelSocket *sioc; | |
259 | NBDExportInfo *list; | |
260 | int i, j; | |
261 | ||
262 | sioc = qio_channel_socket_new(); | |
263 | if (qio_channel_socket_connect_sync(sioc, saddr, &err) < 0) { | |
264 | error_report_err(err); | |
265 | return EXIT_FAILURE; | |
266 | } | |
267 | rc = nbd_receive_export_list(QIO_CHANNEL(sioc), tls, hostname, &list, | |
268 | &err); | |
269 | if (rc < 0) { | |
270 | if (err) { | |
271 | error_report_err(err); | |
272 | } | |
273 | goto out; | |
274 | } | |
275 | printf("exports available: %d\n", rc); | |
276 | for (i = 0; i < rc; i++) { | |
277 | printf(" export: '%s'\n", list[i].name); | |
278 | if (list[i].description && *list[i].description) { | |
279 | printf(" description: %s\n", list[i].description); | |
280 | } | |
281 | if (list[i].flags & NBD_FLAG_HAS_FLAGS) { | |
282 | printf(" size: %" PRIu64 "\n", list[i].size); | |
283 | printf(" flags: 0x%x (", list[i].flags); | |
284 | if (list[i].flags & NBD_FLAG_READ_ONLY) { | |
285 | printf(" readonly"); | |
286 | } | |
287 | if (list[i].flags & NBD_FLAG_SEND_FLUSH) { | |
288 | printf(" flush"); | |
289 | } | |
290 | if (list[i].flags & NBD_FLAG_SEND_FUA) { | |
291 | printf(" fua"); | |
292 | } | |
293 | if (list[i].flags & NBD_FLAG_ROTATIONAL) { | |
294 | printf(" rotational"); | |
295 | } | |
296 | if (list[i].flags & NBD_FLAG_SEND_TRIM) { | |
297 | printf(" trim"); | |
298 | } | |
299 | if (list[i].flags & NBD_FLAG_SEND_WRITE_ZEROES) { | |
300 | printf(" zeroes"); | |
301 | } | |
302 | if (list[i].flags & NBD_FLAG_SEND_DF) { | |
303 | printf(" df"); | |
304 | } | |
305 | if (list[i].flags & NBD_FLAG_CAN_MULTI_CONN) { | |
306 | printf(" multi"); | |
307 | } | |
308 | if (list[i].flags & NBD_FLAG_SEND_RESIZE) { | |
309 | printf(" resize"); | |
310 | } | |
311 | if (list[i].flags & NBD_FLAG_SEND_CACHE) { | |
312 | printf(" cache"); | |
313 | } | |
314 | printf(" )\n"); | |
315 | } | |
316 | if (list[i].min_block) { | |
317 | printf(" min block: %u\n", list[i].min_block); | |
318 | printf(" opt block: %u\n", list[i].opt_block); | |
319 | printf(" max block: %u\n", list[i].max_block); | |
320 | } | |
321 | if (list[i].n_contexts) { | |
322 | printf(" available meta contexts: %d\n", list[i].n_contexts); | |
323 | for (j = 0; j < list[i].n_contexts; j++) { | |
324 | printf(" %s\n", list[i].contexts[j]); | |
325 | } | |
326 | } | |
327 | } | |
328 | nbd_free_export_list(list, rc); | |
329 | ||
330 | ret = EXIT_SUCCESS; | |
331 | out: | |
332 | object_unref(OBJECT(sioc)); | |
333 | return ret; | |
334 | } | |
335 | ||
336 | ||
337 | #if HAVE_NBD_DEVICE | |
338 | static void *show_parts(void *arg) | |
339 | { | |
340 | char *device = arg; | |
341 | int nbd; | |
342 | ||
343 | /* linux just needs an open() to trigger | |
344 | * the partition table update | |
345 | * but remember to load the module with max_part != 0 : | |
346 | * modprobe nbd max_part=63 | |
347 | */ | |
348 | nbd = open(device, O_RDWR); | |
349 | if (nbd >= 0) { | |
350 | close(nbd); | |
351 | } | |
352 | return NULL; | |
353 | } | |
354 | ||
355 | static void *nbd_client_thread(void *arg) | |
356 | { | |
357 | char *device = arg; | |
358 | NBDExportInfo info = { .request_sizes = false, .name = g_strdup("") }; | |
359 | QIOChannelSocket *sioc; | |
360 | int fd; | |
361 | int ret; | |
362 | pthread_t show_parts_thread; | |
363 | Error *local_error = NULL; | |
364 | ||
365 | sioc = qio_channel_socket_new(); | |
366 | if (qio_channel_socket_connect_sync(sioc, | |
367 | saddr, | |
368 | &local_error) < 0) { | |
369 | error_report_err(local_error); | |
370 | goto out; | |
371 | } | |
372 | ||
373 | ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), | |
374 | NULL, NULL, NULL, &info, &local_error); | |
375 | if (ret < 0) { | |
376 | if (local_error) { | |
377 | error_report_err(local_error); | |
378 | } | |
379 | goto out_socket; | |
380 | } | |
381 | ||
382 | fd = open(device, O_RDWR); | |
383 | if (fd < 0) { | |
384 | /* Linux-only, we can use %m in printf. */ | |
385 | error_report("Failed to open %s: %m", device); | |
386 | goto out_socket; | |
387 | } | |
388 | ||
389 | ret = nbd_init(fd, sioc, &info, &local_error); | |
390 | if (ret < 0) { | |
391 | error_report_err(local_error); | |
392 | goto out_fd; | |
393 | } | |
394 | ||
395 | /* update partition table */ | |
396 | pthread_create(&show_parts_thread, NULL, show_parts, device); | |
397 | ||
398 | if (verbose) { | |
399 | fprintf(stderr, "NBD device %s is now connected to %s\n", | |
400 | device, srcpath); | |
401 | } else { | |
402 | /* Close stderr so that the qemu-nbd process exits. */ | |
403 | dup2(STDOUT_FILENO, STDERR_FILENO); | |
404 | } | |
405 | ||
406 | ret = nbd_client(fd); | |
407 | if (ret) { | |
408 | goto out_fd; | |
409 | } | |
410 | close(fd); | |
411 | object_unref(OBJECT(sioc)); | |
412 | g_free(info.name); | |
413 | kill(getpid(), SIGTERM); | |
414 | return (void *) EXIT_SUCCESS; | |
415 | ||
416 | out_fd: | |
417 | close(fd); | |
418 | out_socket: | |
419 | object_unref(OBJECT(sioc)); | |
420 | out: | |
421 | g_free(info.name); | |
422 | kill(getpid(), SIGTERM); | |
423 | return (void *) EXIT_FAILURE; | |
424 | } | |
425 | #endif /* HAVE_NBD_DEVICE */ | |
426 | ||
427 | static int nbd_can_accept(void) | |
428 | { | |
429 | return state == RUNNING && nb_fds < shared; | |
430 | } | |
431 | ||
432 | static void nbd_export_closed(NBDExport *export) | |
433 | { | |
434 | assert(state == TERMINATING); | |
435 | state = TERMINATED; | |
436 | } | |
437 | ||
438 | static void nbd_update_server_watch(void); | |
439 | ||
440 | static void nbd_client_closed(NBDClient *client, bool negotiated) | |
441 | { | |
442 | nb_fds--; | |
443 | if (negotiated && nb_fds == 0 && !persistent && state == RUNNING) { | |
444 | state = TERMINATE; | |
445 | } | |
446 | nbd_update_server_watch(); | |
447 | nbd_client_put(client); | |
448 | } | |
449 | ||
450 | static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc, | |
451 | gpointer opaque) | |
452 | { | |
453 | if (state >= TERMINATE) { | |
454 | return; | |
455 | } | |
456 | ||
457 | nb_fds++; | |
458 | nbd_update_server_watch(); | |
459 | nbd_client_new(cioc, tlscreds, tlsauthz, nbd_client_closed); | |
460 | } | |
461 | ||
462 | static void nbd_update_server_watch(void) | |
463 | { | |
464 | if (nbd_can_accept()) { | |
465 | qio_net_listener_set_client_func(server, nbd_accept, NULL, NULL); | |
466 | } else { | |
467 | qio_net_listener_set_client_func(server, NULL, NULL, NULL); | |
468 | } | |
469 | } | |
470 | ||
471 | ||
472 | static SocketAddress *nbd_build_socket_address(const char *sockpath, | |
473 | const char *bindto, | |
474 | const char *port) | |
475 | { | |
476 | SocketAddress *saddr; | |
477 | ||
478 | saddr = g_new0(SocketAddress, 1); | |
479 | if (sockpath) { | |
480 | saddr->type = SOCKET_ADDRESS_TYPE_UNIX; | |
481 | saddr->u.q_unix.path = g_strdup(sockpath); | |
482 | } else { | |
483 | InetSocketAddress *inet; | |
484 | saddr->type = SOCKET_ADDRESS_TYPE_INET; | |
485 | inet = &saddr->u.inet; | |
486 | inet->host = g_strdup(bindto); | |
487 | if (port) { | |
488 | inet->port = g_strdup(port); | |
489 | } else { | |
490 | inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT); | |
491 | } | |
492 | } | |
493 | ||
494 | return saddr; | |
495 | } | |
496 | ||
497 | ||
498 | static QemuOptsList file_opts = { | |
499 | .name = "file", | |
500 | .implied_opt_name = "file", | |
501 | .head = QTAILQ_HEAD_INITIALIZER(file_opts.head), | |
502 | .desc = { | |
503 | /* no elements => accept any params */ | |
504 | { /* end of list */ } | |
505 | }, | |
506 | }; | |
507 | ||
508 | static QemuOptsList qemu_object_opts = { | |
509 | .name = "object", | |
510 | .implied_opt_name = "qom-type", | |
511 | .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head), | |
512 | .desc = { | |
513 | { } | |
514 | }, | |
515 | }; | |
516 | ||
517 | ||
518 | ||
519 | static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, bool list, | |
520 | Error **errp) | |
521 | { | |
522 | Object *obj; | |
523 | QCryptoTLSCreds *creds; | |
524 | ||
525 | obj = object_resolve_path_component( | |
526 | object_get_objects_root(), id); | |
527 | if (!obj) { | |
528 | error_setg(errp, "No TLS credentials with id '%s'", | |
529 | id); | |
530 | return NULL; | |
531 | } | |
532 | creds = (QCryptoTLSCreds *) | |
533 | object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS); | |
534 | if (!creds) { | |
535 | error_setg(errp, "Object with id '%s' is not TLS credentials", | |
536 | id); | |
537 | return NULL; | |
538 | } | |
539 | ||
540 | if (list) { | |
541 | if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) { | |
542 | error_setg(errp, | |
543 | "Expecting TLS credentials with a client endpoint"); | |
544 | return NULL; | |
545 | } | |
546 | } else { | |
547 | if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) { | |
548 | error_setg(errp, | |
549 | "Expecting TLS credentials with a server endpoint"); | |
550 | return NULL; | |
551 | } | |
552 | } | |
553 | object_ref(obj); | |
554 | return creds; | |
555 | } | |
556 | ||
557 | static void setup_address_and_port(const char **address, const char **port) | |
558 | { | |
559 | if (*address == NULL) { | |
560 | *address = "0.0.0.0"; | |
561 | } | |
562 | ||
563 | if (*port == NULL) { | |
564 | *port = stringify(NBD_DEFAULT_PORT); | |
565 | } | |
566 | } | |
567 | ||
568 | /* | |
569 | * Check socket parameters compatibility when socket activation is used. | |
570 | */ | |
571 | static const char *socket_activation_validate_opts(const char *device, | |
572 | const char *sockpath, | |
573 | const char *address, | |
574 | const char *port, | |
575 | bool list) | |
576 | { | |
577 | if (device != NULL) { | |
578 | return "NBD device can't be set when using socket activation"; | |
579 | } | |
580 | ||
581 | if (sockpath != NULL) { | |
582 | return "Unix socket can't be set when using socket activation"; | |
583 | } | |
584 | ||
585 | if (address != NULL) { | |
586 | return "The interface can't be set when using socket activation"; | |
587 | } | |
588 | ||
589 | if (port != NULL) { | |
590 | return "TCP port number can't be set when using socket activation"; | |
591 | } | |
592 | ||
593 | if (list) { | |
594 | return "List mode is incompatible with socket activation"; | |
595 | } | |
596 | ||
597 | return NULL; | |
598 | } | |
599 | ||
600 | static void qemu_nbd_shutdown(void) | |
601 | { | |
602 | job_cancel_sync_all(); | |
603 | bdrv_close_all(); | |
604 | } | |
605 | ||
606 | int main(int argc, char **argv) | |
607 | { | |
608 | BlockBackend *blk; | |
609 | BlockDriverState *bs; | |
610 | uint64_t dev_offset = 0; | |
611 | uint16_t nbdflags = 0; | |
612 | bool disconnect = false; | |
613 | const char *bindto = NULL; | |
614 | const char *port = NULL; | |
615 | char *sockpath = NULL; | |
616 | char *device = NULL; | |
617 | int64_t fd_size; | |
618 | QemuOpts *sn_opts = NULL; | |
619 | const char *sn_id_or_name = NULL; | |
620 | const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:D:B:L"; | |
621 | struct option lopt[] = { | |
622 | { "help", no_argument, NULL, 'h' }, | |
623 | { "version", no_argument, NULL, 'V' }, | |
624 | { "bind", required_argument, NULL, 'b' }, | |
625 | { "port", required_argument, NULL, 'p' }, | |
626 | { "socket", required_argument, NULL, 'k' }, | |
627 | { "offset", required_argument, NULL, 'o' }, | |
628 | { "read-only", no_argument, NULL, 'r' }, | |
629 | { "partition", required_argument, NULL, 'P' }, | |
630 | { "bitmap", required_argument, NULL, 'B' }, | |
631 | { "connect", required_argument, NULL, 'c' }, | |
632 | { "disconnect", no_argument, NULL, 'd' }, | |
633 | { "list", no_argument, NULL, 'L' }, | |
634 | { "snapshot", no_argument, NULL, 's' }, | |
635 | { "load-snapshot", required_argument, NULL, 'l' }, | |
636 | { "nocache", no_argument, NULL, 'n' }, | |
637 | { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE }, | |
638 | { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO }, | |
639 | { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD }, | |
640 | { "detect-zeroes", required_argument, NULL, | |
641 | QEMU_NBD_OPT_DETECT_ZEROES }, | |
642 | { "shared", required_argument, NULL, 'e' }, | |
643 | { "format", required_argument, NULL, 'f' }, | |
644 | { "persistent", no_argument, NULL, 't' }, | |
645 | { "verbose", no_argument, NULL, 'v' }, | |
646 | { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT }, | |
647 | { "export-name", required_argument, NULL, 'x' }, | |
648 | { "description", required_argument, NULL, 'D' }, | |
649 | { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS }, | |
650 | { "tls-authz", required_argument, NULL, QEMU_NBD_OPT_TLSAUTHZ }, | |
651 | { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS }, | |
652 | { "trace", required_argument, NULL, 'T' }, | |
653 | { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK }, | |
654 | { NULL, 0, NULL, 0 } | |
655 | }; | |
656 | int ch; | |
657 | int opt_ind = 0; | |
658 | int flags = BDRV_O_RDWR; | |
659 | int partition = 0; | |
660 | int ret = 0; | |
661 | bool seen_cache = false; | |
662 | bool seen_discard = false; | |
663 | bool seen_aio = false; | |
664 | pthread_t client_thread; | |
665 | const char *fmt = NULL; | |
666 | Error *local_err = NULL; | |
667 | BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; | |
668 | QDict *options = NULL; | |
669 | const char *export_name = NULL; /* defaults to "" later for server mode */ | |
670 | const char *export_description = NULL; | |
671 | const char *bitmap = NULL; | |
672 | const char *tlscredsid = NULL; | |
673 | bool imageOpts = false; | |
674 | bool writethrough = true; | |
675 | char *trace_file = NULL; | |
676 | bool fork_process = false; | |
677 | bool list = false; | |
678 | int old_stderr = -1; | |
679 | unsigned socket_activation; | |
680 | ||
681 | /* The client thread uses SIGTERM to interrupt the server. A signal | |
682 | * handler ensures that "qemu-nbd -v -c" exits with a nice status code. | |
683 | */ | |
684 | struct sigaction sa_sigterm; | |
685 | memset(&sa_sigterm, 0, sizeof(sa_sigterm)); | |
686 | sa_sigterm.sa_handler = termsig_handler; | |
687 | sigaction(SIGTERM, &sa_sigterm, NULL); | |
688 | ||
689 | #ifdef CONFIG_POSIX | |
690 | signal(SIGPIPE, SIG_IGN); | |
691 | #endif | |
692 | ||
693 | error_init(argv[0]); | |
694 | module_call_init(MODULE_INIT_TRACE); | |
695 | qcrypto_init(&error_fatal); | |
696 | ||
697 | module_call_init(MODULE_INIT_QOM); | |
698 | qemu_add_opts(&qemu_object_opts); | |
699 | qemu_add_opts(&qemu_trace_opts); | |
700 | qemu_init_exec_dir(argv[0]); | |
701 | ||
702 | while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { | |
703 | switch (ch) { | |
704 | case 's': | |
705 | flags |= BDRV_O_SNAPSHOT; | |
706 | break; | |
707 | case 'n': | |
708 | optarg = (char *) "none"; | |
709 | /* fallthrough */ | |
710 | case QEMU_NBD_OPT_CACHE: | |
711 | if (seen_cache) { | |
712 | error_report("-n and --cache can only be specified once"); | |
713 | exit(EXIT_FAILURE); | |
714 | } | |
715 | seen_cache = true; | |
716 | if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) { | |
717 | error_report("Invalid cache mode `%s'", optarg); | |
718 | exit(EXIT_FAILURE); | |
719 | } | |
720 | break; | |
721 | case QEMU_NBD_OPT_AIO: | |
722 | if (seen_aio) { | |
723 | error_report("--aio can only be specified once"); | |
724 | exit(EXIT_FAILURE); | |
725 | } | |
726 | seen_aio = true; | |
727 | if (!strcmp(optarg, "native")) { | |
728 | flags |= BDRV_O_NATIVE_AIO; | |
729 | } else if (!strcmp(optarg, "threads")) { | |
730 | /* this is the default */ | |
731 | } else { | |
732 | error_report("invalid aio mode `%s'", optarg); | |
733 | exit(EXIT_FAILURE); | |
734 | } | |
735 | break; | |
736 | case QEMU_NBD_OPT_DISCARD: | |
737 | if (seen_discard) { | |
738 | error_report("--discard can only be specified once"); | |
739 | exit(EXIT_FAILURE); | |
740 | } | |
741 | seen_discard = true; | |
742 | if (bdrv_parse_discard_flags(optarg, &flags) == -1) { | |
743 | error_report("Invalid discard mode `%s'", optarg); | |
744 | exit(EXIT_FAILURE); | |
745 | } | |
746 | break; | |
747 | case QEMU_NBD_OPT_DETECT_ZEROES: | |
748 | detect_zeroes = | |
749 | qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, | |
750 | optarg, | |
751 | BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, | |
752 | &local_err); | |
753 | if (local_err) { | |
754 | error_reportf_err(local_err, | |
755 | "Failed to parse detect_zeroes mode: "); | |
756 | exit(EXIT_FAILURE); | |
757 | } | |
758 | if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && | |
759 | !(flags & BDRV_O_UNMAP)) { | |
760 | error_report("setting detect-zeroes to unmap is not allowed " | |
761 | "without setting discard operation to unmap"); | |
762 | exit(EXIT_FAILURE); | |
763 | } | |
764 | break; | |
765 | case 'b': | |
766 | bindto = optarg; | |
767 | break; | |
768 | case 'p': | |
769 | port = optarg; | |
770 | break; | |
771 | case 'o': | |
772 | if (qemu_strtou64(optarg, NULL, 0, &dev_offset) < 0) { | |
773 | error_report("Invalid offset '%s'", optarg); | |
774 | exit(EXIT_FAILURE); | |
775 | } | |
776 | break; | |
777 | case 'l': | |
778 | if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) { | |
779 | sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts, | |
780 | optarg, false); | |
781 | if (!sn_opts) { | |
782 | error_report("Failed in parsing snapshot param `%s'", | |
783 | optarg); | |
784 | exit(EXIT_FAILURE); | |
785 | } | |
786 | } else { | |
787 | sn_id_or_name = optarg; | |
788 | } | |
789 | /* fall through */ | |
790 | case 'r': | |
791 | nbdflags |= NBD_FLAG_READ_ONLY; | |
792 | flags &= ~BDRV_O_RDWR; | |
793 | break; | |
794 | case 'P': | |
795 | warn_report("The '-P' option is deprecated; use --image-opts with " | |
796 | "a raw device wrapper for subset exports instead"); | |
797 | if (qemu_strtoi(optarg, NULL, 0, &partition) < 0 || | |
798 | partition < 1 || partition > 8) { | |
799 | error_report("Invalid partition '%s'", optarg); | |
800 | exit(EXIT_FAILURE); | |
801 | } | |
802 | break; | |
803 | case 'B': | |
804 | bitmap = optarg; | |
805 | break; | |
806 | case 'k': | |
807 | sockpath = optarg; | |
808 | if (sockpath[0] != '/') { | |
809 | error_report("socket path must be absolute"); | |
810 | exit(EXIT_FAILURE); | |
811 | } | |
812 | break; | |
813 | case 'd': | |
814 | disconnect = true; | |
815 | break; | |
816 | case 'c': | |
817 | device = optarg; | |
818 | break; | |
819 | case 'e': | |
820 | if (qemu_strtoi(optarg, NULL, 0, &shared) < 0 || | |
821 | shared < 1) { | |
822 | error_report("Invalid shared device number '%s'", optarg); | |
823 | exit(EXIT_FAILURE); | |
824 | } | |
825 | break; | |
826 | case 'f': | |
827 | fmt = optarg; | |
828 | break; | |
829 | case 't': | |
830 | persistent = 1; | |
831 | break; | |
832 | case 'x': | |
833 | export_name = optarg; | |
834 | break; | |
835 | case 'D': | |
836 | export_description = optarg; | |
837 | break; | |
838 | case 'v': | |
839 | verbose = 1; | |
840 | break; | |
841 | case 'V': | |
842 | version(argv[0]); | |
843 | exit(0); | |
844 | break; | |
845 | case 'h': | |
846 | usage(argv[0]); | |
847 | exit(0); | |
848 | break; | |
849 | case '?': | |
850 | error_report("Try `%s --help' for more information.", argv[0]); | |
851 | exit(EXIT_FAILURE); | |
852 | case QEMU_NBD_OPT_OBJECT: { | |
853 | QemuOpts *opts; | |
854 | opts = qemu_opts_parse_noisily(&qemu_object_opts, | |
855 | optarg, true); | |
856 | if (!opts) { | |
857 | exit(EXIT_FAILURE); | |
858 | } | |
859 | } break; | |
860 | case QEMU_NBD_OPT_TLSCREDS: | |
861 | tlscredsid = optarg; | |
862 | break; | |
863 | case QEMU_NBD_OPT_IMAGE_OPTS: | |
864 | imageOpts = true; | |
865 | break; | |
866 | case 'T': | |
867 | g_free(trace_file); | |
868 | trace_file = trace_opt_parse(optarg); | |
869 | break; | |
870 | case QEMU_NBD_OPT_TLSAUTHZ: | |
871 | tlsauthz = optarg; | |
872 | break; | |
873 | case QEMU_NBD_OPT_FORK: | |
874 | fork_process = true; | |
875 | break; | |
876 | case 'L': | |
877 | list = true; | |
878 | break; | |
879 | } | |
880 | } | |
881 | ||
882 | if (list) { | |
883 | if (argc != optind) { | |
884 | error_report("List mode is incompatible with a file name"); | |
885 | exit(EXIT_FAILURE); | |
886 | } | |
887 | if (export_name || export_description || dev_offset || partition || | |
888 | device || disconnect || fmt || sn_id_or_name || bitmap || | |
889 | seen_aio || seen_discard || seen_cache) { | |
890 | error_report("List mode is incompatible with per-device settings"); | |
891 | exit(EXIT_FAILURE); | |
892 | } | |
893 | if (fork_process) { | |
894 | error_report("List mode is incompatible with forking"); | |
895 | exit(EXIT_FAILURE); | |
896 | } | |
897 | } else if ((argc - optind) != 1) { | |
898 | error_report("Invalid number of arguments"); | |
899 | error_printf("Try `%s --help' for more information.\n", argv[0]); | |
900 | exit(EXIT_FAILURE); | |
901 | } else if (!export_name) { | |
902 | export_name = ""; | |
903 | } | |
904 | ||
905 | qemu_opts_foreach(&qemu_object_opts, | |
906 | user_creatable_add_opts_foreach, | |
907 | NULL, &error_fatal); | |
908 | ||
909 | if (!trace_init_backends()) { | |
910 | exit(1); | |
911 | } | |
912 | trace_init_file(trace_file); | |
913 | qemu_set_log(LOG_TRACE); | |
914 | ||
915 | socket_activation = check_socket_activation(); | |
916 | if (socket_activation == 0) { | |
917 | setup_address_and_port(&bindto, &port); | |
918 | } else { | |
919 | /* Using socket activation - check user didn't use -p etc. */ | |
920 | const char *err_msg = socket_activation_validate_opts(device, sockpath, | |
921 | bindto, port, | |
922 | list); | |
923 | if (err_msg != NULL) { | |
924 | error_report("%s", err_msg); | |
925 | exit(EXIT_FAILURE); | |
926 | } | |
927 | ||
928 | /* qemu-nbd can only listen on a single socket. */ | |
929 | if (socket_activation > 1) { | |
930 | error_report("qemu-nbd does not support socket activation with %s > 1", | |
931 | "LISTEN_FDS"); | |
932 | exit(EXIT_FAILURE); | |
933 | } | |
934 | } | |
935 | ||
936 | if (tlscredsid) { | |
937 | if (sockpath) { | |
938 | error_report("TLS is only supported with IPv4/IPv6"); | |
939 | exit(EXIT_FAILURE); | |
940 | } | |
941 | if (device) { | |
942 | error_report("TLS is not supported with a host device"); | |
943 | exit(EXIT_FAILURE); | |
944 | } | |
945 | if (tlsauthz && list) { | |
946 | error_report("TLS authorization is incompatible with export list"); | |
947 | exit(EXIT_FAILURE); | |
948 | } | |
949 | tlscreds = nbd_get_tls_creds(tlscredsid, list, &local_err); | |
950 | if (local_err) { | |
951 | error_report("Failed to get TLS creds %s", | |
952 | error_get_pretty(local_err)); | |
953 | exit(EXIT_FAILURE); | |
954 | } | |
955 | } else { | |
956 | if (tlsauthz) { | |
957 | error_report("--tls-authz is not permitted without --tls-creds"); | |
958 | exit(EXIT_FAILURE); | |
959 | } | |
960 | } | |
961 | ||
962 | if (list) { | |
963 | saddr = nbd_build_socket_address(sockpath, bindto, port); | |
964 | return qemu_nbd_client_list(saddr, tlscreds, bindto); | |
965 | } | |
966 | ||
967 | #if !HAVE_NBD_DEVICE | |
968 | if (disconnect || device) { | |
969 | error_report("Kernel /dev/nbdN support not available"); | |
970 | exit(EXIT_FAILURE); | |
971 | } | |
972 | #else /* HAVE_NBD_DEVICE */ | |
973 | if (disconnect) { | |
974 | int nbdfd = open(argv[optind], O_RDWR); | |
975 | if (nbdfd < 0) { | |
976 | error_report("Cannot open %s: %s", argv[optind], | |
977 | strerror(errno)); | |
978 | exit(EXIT_FAILURE); | |
979 | } | |
980 | nbd_disconnect(nbdfd); | |
981 | ||
982 | close(nbdfd); | |
983 | ||
984 | printf("%s disconnected\n", argv[optind]); | |
985 | ||
986 | return 0; | |
987 | } | |
988 | #endif | |
989 | ||
990 | if ((device && !verbose) || fork_process) { | |
991 | int stderr_fd[2]; | |
992 | pid_t pid; | |
993 | int ret; | |
994 | ||
995 | if (qemu_pipe(stderr_fd) < 0) { | |
996 | error_report("Error setting up communication pipe: %s", | |
997 | strerror(errno)); | |
998 | exit(EXIT_FAILURE); | |
999 | } | |
1000 | ||
1001 | /* Now daemonize, but keep a communication channel open to | |
1002 | * print errors and exit with the proper status code. | |
1003 | */ | |
1004 | pid = fork(); | |
1005 | if (pid < 0) { | |
1006 | error_report("Failed to fork: %s", strerror(errno)); | |
1007 | exit(EXIT_FAILURE); | |
1008 | } else if (pid == 0) { | |
1009 | close(stderr_fd[0]); | |
1010 | ret = qemu_daemon(1, 0); | |
1011 | ||
1012 | /* Temporarily redirect stderr to the parent's pipe... */ | |
1013 | old_stderr = dup(STDERR_FILENO); | |
1014 | dup2(stderr_fd[1], STDERR_FILENO); | |
1015 | if (ret < 0) { | |
1016 | error_report("Failed to daemonize: %s", strerror(errno)); | |
1017 | exit(EXIT_FAILURE); | |
1018 | } | |
1019 | ||
1020 | /* ... close the descriptor we inherited and go on. */ | |
1021 | close(stderr_fd[1]); | |
1022 | } else { | |
1023 | bool errors = false; | |
1024 | char *buf; | |
1025 | ||
1026 | /* In the parent. Print error messages from the child until | |
1027 | * it closes the pipe. | |
1028 | */ | |
1029 | close(stderr_fd[1]); | |
1030 | buf = g_malloc(1024); | |
1031 | while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { | |
1032 | errors = true; | |
1033 | ret = qemu_write_full(STDERR_FILENO, buf, ret); | |
1034 | if (ret < 0) { | |
1035 | exit(EXIT_FAILURE); | |
1036 | } | |
1037 | } | |
1038 | if (ret < 0) { | |
1039 | error_report("Cannot read from daemon: %s", | |
1040 | strerror(errno)); | |
1041 | exit(EXIT_FAILURE); | |
1042 | } | |
1043 | ||
1044 | /* Usually the daemon should not print any message. | |
1045 | * Exit with zero status in that case. | |
1046 | */ | |
1047 | exit(errors); | |
1048 | } | |
1049 | } | |
1050 | ||
1051 | if (device != NULL && sockpath == NULL) { | |
1052 | sockpath = g_malloc(128); | |
1053 | snprintf(sockpath, 128, SOCKET_PATH, basename(device)); | |
1054 | } | |
1055 | ||
1056 | server = qio_net_listener_new(); | |
1057 | if (socket_activation == 0) { | |
1058 | saddr = nbd_build_socket_address(sockpath, bindto, port); | |
1059 | if (qio_net_listener_open_sync(server, saddr, &local_err) < 0) { | |
1060 | object_unref(OBJECT(server)); | |
1061 | error_report_err(local_err); | |
1062 | exit(EXIT_FAILURE); | |
1063 | } | |
1064 | } else { | |
1065 | size_t i; | |
1066 | /* See comment in check_socket_activation above. */ | |
1067 | for (i = 0; i < socket_activation; i++) { | |
1068 | QIOChannelSocket *sioc; | |
1069 | sioc = qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD + i, | |
1070 | &local_err); | |
1071 | if (sioc == NULL) { | |
1072 | object_unref(OBJECT(server)); | |
1073 | error_report("Failed to use socket activation: %s", | |
1074 | error_get_pretty(local_err)); | |
1075 | exit(EXIT_FAILURE); | |
1076 | } | |
1077 | qio_net_listener_add(server, sioc); | |
1078 | object_unref(OBJECT(sioc)); | |
1079 | } | |
1080 | } | |
1081 | ||
1082 | if (qemu_init_main_loop(&local_err)) { | |
1083 | error_report_err(local_err); | |
1084 | exit(EXIT_FAILURE); | |
1085 | } | |
1086 | bdrv_init(); | |
1087 | atexit(qemu_nbd_shutdown); | |
1088 | ||
1089 | srcpath = argv[optind]; | |
1090 | if (imageOpts) { | |
1091 | QemuOpts *opts; | |
1092 | if (fmt) { | |
1093 | error_report("--image-opts and -f are mutually exclusive"); | |
1094 | exit(EXIT_FAILURE); | |
1095 | } | |
1096 | opts = qemu_opts_parse_noisily(&file_opts, srcpath, true); | |
1097 | if (!opts) { | |
1098 | qemu_opts_reset(&file_opts); | |
1099 | exit(EXIT_FAILURE); | |
1100 | } | |
1101 | options = qemu_opts_to_qdict(opts, NULL); | |
1102 | qemu_opts_reset(&file_opts); | |
1103 | blk = blk_new_open(NULL, NULL, options, flags, &local_err); | |
1104 | } else { | |
1105 | if (fmt) { | |
1106 | options = qdict_new(); | |
1107 | qdict_put_str(options, "driver", fmt); | |
1108 | } | |
1109 | blk = blk_new_open(srcpath, NULL, options, flags, &local_err); | |
1110 | } | |
1111 | ||
1112 | if (!blk) { | |
1113 | error_reportf_err(local_err, "Failed to blk_new_open '%s': ", | |
1114 | argv[optind]); | |
1115 | exit(EXIT_FAILURE); | |
1116 | } | |
1117 | bs = blk_bs(blk); | |
1118 | ||
1119 | blk_set_enable_write_cache(blk, !writethrough); | |
1120 | ||
1121 | if (sn_opts) { | |
1122 | ret = bdrv_snapshot_load_tmp(bs, | |
1123 | qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID), | |
1124 | qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME), | |
1125 | &local_err); | |
1126 | } else if (sn_id_or_name) { | |
1127 | ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name, | |
1128 | &local_err); | |
1129 | } | |
1130 | if (ret < 0) { | |
1131 | error_reportf_err(local_err, "Failed to load snapshot: "); | |
1132 | exit(EXIT_FAILURE); | |
1133 | } | |
1134 | ||
1135 | bs->detect_zeroes = detect_zeroes; | |
1136 | fd_size = blk_getlength(blk); | |
1137 | if (fd_size < 0) { | |
1138 | error_report("Failed to determine the image length: %s", | |
1139 | strerror(-fd_size)); | |
1140 | exit(EXIT_FAILURE); | |
1141 | } | |
1142 | ||
1143 | if (dev_offset >= fd_size) { | |
1144 | error_report("Offset (%" PRIu64 ") has to be smaller than the image " | |
1145 | "size (%" PRId64 ")", dev_offset, fd_size); | |
1146 | exit(EXIT_FAILURE); | |
1147 | } | |
1148 | fd_size -= dev_offset; | |
1149 | ||
1150 | if (partition) { | |
1151 | uint64_t limit; | |
1152 | ||
1153 | if (dev_offset) { | |
1154 | error_report("Cannot request partition and offset together"); | |
1155 | exit(EXIT_FAILURE); | |
1156 | } | |
1157 | ret = find_partition(blk, partition, &dev_offset, &limit); | |
1158 | if (ret < 0) { | |
1159 | error_report("Could not find partition %d: %s", partition, | |
1160 | strerror(-ret)); | |
1161 | exit(EXIT_FAILURE); | |
1162 | } | |
1163 | /* | |
1164 | * MBR partition limits are (32-bit << 9); this assert lets | |
1165 | * the compiler know that we can't overflow 64 bits. | |
1166 | */ | |
1167 | assert(dev_offset + limit >= dev_offset); | |
1168 | if (dev_offset + limit > fd_size) { | |
1169 | error_report("Discovered partition %d at offset %" PRIu64 | |
1170 | " size %" PRIu64 ", but size exceeds file length %" | |
1171 | PRId64, partition, dev_offset, limit, fd_size); | |
1172 | exit(EXIT_FAILURE); | |
1173 | } | |
1174 | fd_size = limit; | |
1175 | } | |
1176 | ||
1177 | export = nbd_export_new(bs, dev_offset, fd_size, export_name, | |
1178 | export_description, bitmap, nbdflags, | |
1179 | nbd_export_closed, writethrough, NULL, | |
1180 | &error_fatal); | |
1181 | ||
1182 | if (device) { | |
1183 | #if HAVE_NBD_DEVICE | |
1184 | int ret; | |
1185 | ||
1186 | ret = pthread_create(&client_thread, NULL, nbd_client_thread, device); | |
1187 | if (ret != 0) { | |
1188 | error_report("Failed to create client thread: %s", strerror(ret)); | |
1189 | exit(EXIT_FAILURE); | |
1190 | } | |
1191 | #endif | |
1192 | } else { | |
1193 | /* Shut up GCC warnings. */ | |
1194 | memset(&client_thread, 0, sizeof(client_thread)); | |
1195 | } | |
1196 | ||
1197 | nbd_update_server_watch(); | |
1198 | ||
1199 | /* now when the initialization is (almost) complete, chdir("/") | |
1200 | * to free any busy filesystems */ | |
1201 | if (chdir("/") < 0) { | |
1202 | error_report("Could not chdir to root directory: %s", | |
1203 | strerror(errno)); | |
1204 | exit(EXIT_FAILURE); | |
1205 | } | |
1206 | ||
1207 | if (fork_process) { | |
1208 | dup2(old_stderr, STDERR_FILENO); | |
1209 | close(old_stderr); | |
1210 | } | |
1211 | ||
1212 | state = RUNNING; | |
1213 | do { | |
1214 | main_loop_wait(false); | |
1215 | if (state == TERMINATE) { | |
1216 | state = TERMINATING; | |
1217 | nbd_export_close(export); | |
1218 | nbd_export_put(export); | |
1219 | export = NULL; | |
1220 | } | |
1221 | } while (state != TERMINATED); | |
1222 | ||
1223 | blk_unref(blk); | |
1224 | if (sockpath) { | |
1225 | unlink(sockpath); | |
1226 | } | |
1227 | ||
1228 | qemu_opts_del(sn_opts); | |
1229 | ||
1230 | if (device) { | |
1231 | void *ret; | |
1232 | pthread_join(client_thread, &ret); | |
1233 | exit(ret != NULL); | |
1234 | } else { | |
1235 | exit(EXIT_SUCCESS); | |
1236 | } | |
1237 | } |