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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 "qemu/help-texts.h" | |
25 | #include "qapi/error.h" | |
26 | #include "qemu/cutils.h" | |
27 | #include "sysemu/block-backend.h" | |
28 | #include "sysemu/runstate.h" /* for qemu_system_killed() prototype */ | |
29 | #include "block/block_int.h" | |
30 | #include "block/nbd.h" | |
31 | #include "qemu/main-loop.h" | |
32 | #include "qemu/module.h" | |
33 | #include "qemu/option.h" | |
34 | #include "qemu/error-report.h" | |
35 | #include "qemu/config-file.h" | |
36 | #include "qemu/bswap.h" | |
37 | #include "qemu/log.h" | |
38 | #include "qemu/systemd.h" | |
39 | #include "block/snapshot.h" | |
40 | #include "qapi/qmp/qdict.h" | |
41 | #include "qapi/qmp/qstring.h" | |
42 | #include "qom/object_interfaces.h" | |
43 | #include "io/channel-socket.h" | |
44 | #include "io/net-listener.h" | |
45 | #include "crypto/init.h" | |
46 | #include "crypto/tlscreds.h" | |
47 | #include "trace/control.h" | |
48 | #include "qemu-version.h" | |
49 | ||
50 | #ifdef CONFIG_SELINUX | |
51 | #include <selinux/selinux.h> | |
52 | #endif | |
53 | ||
54 | #ifdef __linux__ | |
55 | #define HAVE_NBD_DEVICE 1 | |
56 | #else | |
57 | #define HAVE_NBD_DEVICE 0 | |
58 | #endif | |
59 | ||
60 | #define SOCKET_PATH "/var/lock/qemu-nbd-%s" | |
61 | #define QEMU_NBD_OPT_CACHE 256 | |
62 | #define QEMU_NBD_OPT_AIO 257 | |
63 | #define QEMU_NBD_OPT_DISCARD 258 | |
64 | #define QEMU_NBD_OPT_DETECT_ZEROES 259 | |
65 | #define QEMU_NBD_OPT_OBJECT 260 | |
66 | #define QEMU_NBD_OPT_TLSCREDS 261 | |
67 | #define QEMU_NBD_OPT_IMAGE_OPTS 262 | |
68 | #define QEMU_NBD_OPT_FORK 263 | |
69 | #define QEMU_NBD_OPT_TLSAUTHZ 264 | |
70 | #define QEMU_NBD_OPT_PID_FILE 265 | |
71 | #define QEMU_NBD_OPT_SELINUX_LABEL 266 | |
72 | #define QEMU_NBD_OPT_TLSHOSTNAME 267 | |
73 | ||
74 | #define MBR_SIZE 512 | |
75 | ||
76 | static int persistent = 0; | |
77 | static enum { RUNNING, TERMINATE, TERMINATED } state; | |
78 | static int shared = 1; | |
79 | static int nb_fds; | |
80 | static QIONetListener *server; | |
81 | static QCryptoTLSCreds *tlscreds; | |
82 | static const char *tlsauthz; | |
83 | ||
84 | static void usage(const char *name) | |
85 | { | |
86 | (printf) ( | |
87 | "Usage: %s [OPTIONS] FILE\n" | |
88 | " or: %s -L [OPTIONS]\n" | |
89 | "QEMU Disk Network Block Device Utility\n" | |
90 | "\n" | |
91 | " -h, --help display this help and exit\n" | |
92 | " -V, --version output version information and exit\n" | |
93 | "\n" | |
94 | "Connection properties:\n" | |
95 | " -p, --port=PORT port to listen on (default `%d')\n" | |
96 | " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" | |
97 | " -k, --socket=PATH path to the unix socket\n" | |
98 | " (default '"SOCKET_PATH"')\n" | |
99 | " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" | |
100 | " -t, --persistent don't exit on the last connection\n" | |
101 | " -v, --verbose display extra debugging information\n" | |
102 | " -x, --export-name=NAME expose export by name (default is empty string)\n" | |
103 | " -D, --description=TEXT export a human-readable description\n" | |
104 | "\n" | |
105 | "Exposing part of the image:\n" | |
106 | " -o, --offset=OFFSET offset into the image\n" | |
107 | " -A, --allocation-depth expose the allocation depth\n" | |
108 | " -B, --bitmap=NAME expose a persistent dirty bitmap\n" | |
109 | "\n" | |
110 | "General purpose options:\n" | |
111 | " -L, --list list exports available from another NBD server\n" | |
112 | " --object type,id=ID,... define an object such as 'secret' for providing\n" | |
113 | " passwords and/or encryption keys\n" | |
114 | " --tls-creds=ID use id of an earlier --object to provide TLS\n" | |
115 | " --tls-authz=ID use id of an earlier --object to provide\n" | |
116 | " authorization\n" | |
117 | " -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n" | |
118 | " specify tracing options\n" | |
119 | " --fork fork off the server process and exit the parent\n" | |
120 | " once the server is running\n" | |
121 | " --pid-file=PATH store the server's process ID in the given file\n" | |
122 | #ifdef CONFIG_SELINUX | |
123 | " --selinux-label=LABEL set SELinux process label on listening socket\n" | |
124 | #endif | |
125 | #if HAVE_NBD_DEVICE | |
126 | "\n" | |
127 | "Kernel NBD client support:\n" | |
128 | " -c, --connect=DEV connect FILE to the local NBD device DEV\n" | |
129 | " -d, --disconnect disconnect the specified device\n" | |
130 | #endif | |
131 | "\n" | |
132 | "Block device options:\n" | |
133 | " -f, --format=FORMAT set image format (raw, qcow2, ...)\n" | |
134 | " -r, --read-only export read-only\n" | |
135 | " -s, --snapshot use FILE as an external snapshot, create a temporary\n" | |
136 | " file with backing_file=FILE, redirect the write to\n" | |
137 | " the temporary one\n" | |
138 | " -l, --load-snapshot=SNAPSHOT_PARAM\n" | |
139 | " load an internal snapshot inside FILE and export it\n" | |
140 | " as an read-only device, SNAPSHOT_PARAM format is\n" | |
141 | " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n" | |
142 | " '[ID_OR_NAME]'\n" | |
143 | " -n, --nocache disable host cache\n" | |
144 | " --cache=MODE set cache mode used to access the disk image, the\n" | |
145 | " valid options are: 'none', 'writeback' (default),\n" | |
146 | " 'writethrough', 'directsync' and 'unsafe'\n" | |
147 | " --aio=MODE set AIO mode (native, io_uring or threads)\n" | |
148 | " --discard=MODE set discard mode (ignore, unmap)\n" | |
149 | " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n" | |
150 | " --image-opts treat FILE as a full set of image options\n" | |
151 | "\n" | |
152 | QEMU_HELP_BOTTOM "\n" | |
153 | , name, name, NBD_DEFAULT_PORT, "DEVICE"); | |
154 | } | |
155 | ||
156 | static void version(const char *name) | |
157 | { | |
158 | printf( | |
159 | "%s " QEMU_FULL_VERSION "\n" | |
160 | "Written by Anthony Liguori.\n" | |
161 | "\n" | |
162 | QEMU_COPYRIGHT "\n" | |
163 | "This is free software; see the source for copying conditions. There is NO\n" | |
164 | "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" | |
165 | , name); | |
166 | } | |
167 | ||
168 | #ifdef CONFIG_POSIX | |
169 | /* | |
170 | * The client thread uses SIGTERM to interrupt the server. A signal | |
171 | * handler ensures that "qemu-nbd -v -c" exits with a nice status code. | |
172 | */ | |
173 | void qemu_system_killed(int signum, pid_t pid) | |
174 | { | |
175 | qatomic_cmpxchg(&state, RUNNING, TERMINATE); | |
176 | qemu_notify_event(); | |
177 | } | |
178 | #endif /* CONFIG_POSIX */ | |
179 | ||
180 | static int qemu_nbd_client_list(SocketAddress *saddr, QCryptoTLSCreds *tls, | |
181 | const char *hostname) | |
182 | { | |
183 | int ret = EXIT_FAILURE; | |
184 | int rc; | |
185 | Error *err = NULL; | |
186 | QIOChannelSocket *sioc; | |
187 | NBDExportInfo *list; | |
188 | int i, j; | |
189 | ||
190 | sioc = qio_channel_socket_new(); | |
191 | if (qio_channel_socket_connect_sync(sioc, saddr, &err) < 0) { | |
192 | error_report_err(err); | |
193 | goto out; | |
194 | } | |
195 | rc = nbd_receive_export_list(QIO_CHANNEL(sioc), tls, hostname, &list, | |
196 | &err); | |
197 | if (rc < 0) { | |
198 | if (err) { | |
199 | error_report_err(err); | |
200 | } | |
201 | goto out; | |
202 | } | |
203 | printf("exports available: %d\n", rc); | |
204 | for (i = 0; i < rc; i++) { | |
205 | printf(" export: '%s'\n", list[i].name); | |
206 | if (list[i].description && *list[i].description) { | |
207 | printf(" description: %s\n", list[i].description); | |
208 | } | |
209 | if (list[i].flags & NBD_FLAG_HAS_FLAGS) { | |
210 | static const char *const flag_names[] = { | |
211 | [NBD_FLAG_READ_ONLY_BIT] = "readonly", | |
212 | [NBD_FLAG_SEND_FLUSH_BIT] = "flush", | |
213 | [NBD_FLAG_SEND_FUA_BIT] = "fua", | |
214 | [NBD_FLAG_ROTATIONAL_BIT] = "rotational", | |
215 | [NBD_FLAG_SEND_TRIM_BIT] = "trim", | |
216 | [NBD_FLAG_SEND_WRITE_ZEROES_BIT] = "zeroes", | |
217 | [NBD_FLAG_SEND_DF_BIT] = "df", | |
218 | [NBD_FLAG_CAN_MULTI_CONN_BIT] = "multi", | |
219 | [NBD_FLAG_SEND_RESIZE_BIT] = "resize", | |
220 | [NBD_FLAG_SEND_CACHE_BIT] = "cache", | |
221 | [NBD_FLAG_SEND_FAST_ZERO_BIT] = "fast-zero", | |
222 | }; | |
223 | ||
224 | printf(" size: %" PRIu64 "\n", list[i].size); | |
225 | printf(" flags: 0x%x (", list[i].flags); | |
226 | for (size_t bit = 0; bit < ARRAY_SIZE(flag_names); bit++) { | |
227 | if (flag_names[bit] && (list[i].flags & (1 << bit))) { | |
228 | printf(" %s", flag_names[bit]); | |
229 | } | |
230 | } | |
231 | printf(" )\n"); | |
232 | } | |
233 | if (list[i].min_block) { | |
234 | printf(" min block: %u\n", list[i].min_block); | |
235 | printf(" opt block: %u\n", list[i].opt_block); | |
236 | printf(" max block: %u\n", list[i].max_block); | |
237 | } | |
238 | if (list[i].n_contexts) { | |
239 | printf(" available meta contexts: %d\n", list[i].n_contexts); | |
240 | for (j = 0; j < list[i].n_contexts; j++) { | |
241 | printf(" %s\n", list[i].contexts[j]); | |
242 | } | |
243 | } | |
244 | } | |
245 | nbd_free_export_list(list, rc); | |
246 | ||
247 | ret = EXIT_SUCCESS; | |
248 | out: | |
249 | object_unref(OBJECT(sioc)); | |
250 | return ret; | |
251 | } | |
252 | ||
253 | ||
254 | struct NbdClientOpts { | |
255 | char *device; | |
256 | char *srcpath; | |
257 | SocketAddress *saddr; | |
258 | int old_stderr; | |
259 | bool fork_process; | |
260 | bool verbose; | |
261 | }; | |
262 | ||
263 | static void nbd_client_release_pipe(int old_stderr) | |
264 | { | |
265 | /* Close stderr so that the qemu-nbd process exits. */ | |
266 | if (dup2(old_stderr, STDERR_FILENO) < 0) { | |
267 | error_report("Could not release pipe to parent: %s", | |
268 | strerror(errno)); | |
269 | exit(EXIT_FAILURE); | |
270 | } | |
271 | if (old_stderr != STDOUT_FILENO && close(old_stderr) < 0) { | |
272 | error_report("Could not release qemu-nbd: %s", strerror(errno)); | |
273 | exit(EXIT_FAILURE); | |
274 | } | |
275 | } | |
276 | ||
277 | #if HAVE_NBD_DEVICE | |
278 | static void *show_parts(void *arg) | |
279 | { | |
280 | char *device = arg; | |
281 | int nbd; | |
282 | ||
283 | /* linux just needs an open() to trigger | |
284 | * the partition table update | |
285 | * but remember to load the module with max_part != 0 : | |
286 | * modprobe nbd max_part=63 | |
287 | */ | |
288 | nbd = open(device, O_RDWR); | |
289 | if (nbd >= 0) { | |
290 | close(nbd); | |
291 | } | |
292 | return NULL; | |
293 | } | |
294 | ||
295 | static void *nbd_client_thread(void *arg) | |
296 | { | |
297 | struct NbdClientOpts *opts = arg; | |
298 | /* TODO: Revisit this if nbd.ko ever gains support for structured reply */ | |
299 | NBDExportInfo info = { .request_sizes = false, .name = g_strdup(""), | |
300 | .mode = NBD_MODE_SIMPLE }; | |
301 | QIOChannelSocket *sioc; | |
302 | int fd = -1; | |
303 | int ret = EXIT_FAILURE; | |
304 | pthread_t show_parts_thread; | |
305 | Error *local_error = NULL; | |
306 | ||
307 | sioc = qio_channel_socket_new(); | |
308 | if (qio_channel_socket_connect_sync(sioc, | |
309 | opts->saddr, | |
310 | &local_error) < 0) { | |
311 | error_report_err(local_error); | |
312 | goto out; | |
313 | } | |
314 | ||
315 | if (nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL, NULL, NULL, | |
316 | &info, &local_error) < 0) { | |
317 | if (local_error) { | |
318 | error_report_err(local_error); | |
319 | } | |
320 | goto out; | |
321 | } | |
322 | ||
323 | fd = open(opts->device, O_RDWR); | |
324 | if (fd < 0) { | |
325 | /* Linux-only, we can use %m in printf. */ | |
326 | error_report("Failed to open %s: %m", opts->device); | |
327 | goto out; | |
328 | } | |
329 | ||
330 | if (nbd_init(fd, sioc, &info, &local_error) < 0) { | |
331 | error_report_err(local_error); | |
332 | goto out; | |
333 | } | |
334 | ||
335 | /* update partition table */ | |
336 | pthread_create(&show_parts_thread, NULL, show_parts, opts->device); | |
337 | ||
338 | if (opts->verbose && !opts->fork_process) { | |
339 | fprintf(stderr, "NBD device %s is now connected to %s\n", | |
340 | opts->device, opts->srcpath); | |
341 | } else { | |
342 | nbd_client_release_pipe(opts->old_stderr); | |
343 | } | |
344 | ||
345 | if (nbd_client(fd) < 0) { | |
346 | goto out; | |
347 | } | |
348 | ||
349 | ret = EXIT_SUCCESS; | |
350 | ||
351 | out: | |
352 | if (fd >= 0) { | |
353 | close(fd); | |
354 | } | |
355 | object_unref(OBJECT(sioc)); | |
356 | g_free(info.name); | |
357 | kill(getpid(), SIGTERM); | |
358 | return (void *) (intptr_t) ret; | |
359 | } | |
360 | #endif /* HAVE_NBD_DEVICE */ | |
361 | ||
362 | static int nbd_can_accept(void) | |
363 | { | |
364 | return state == RUNNING && (shared == 0 || nb_fds < shared); | |
365 | } | |
366 | ||
367 | static void nbd_update_server_watch(void); | |
368 | ||
369 | static void nbd_client_closed(NBDClient *client, bool negotiated) | |
370 | { | |
371 | nb_fds--; | |
372 | if (negotiated && nb_fds == 0 && !persistent && state == RUNNING) { | |
373 | state = TERMINATE; | |
374 | } | |
375 | nbd_update_server_watch(); | |
376 | nbd_client_put(client); | |
377 | } | |
378 | ||
379 | static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc, | |
380 | gpointer opaque) | |
381 | { | |
382 | if (state >= TERMINATE) { | |
383 | return; | |
384 | } | |
385 | ||
386 | nb_fds++; | |
387 | nbd_update_server_watch(); | |
388 | nbd_client_new(cioc, tlscreds, tlsauthz, nbd_client_closed); | |
389 | } | |
390 | ||
391 | static void nbd_update_server_watch(void) | |
392 | { | |
393 | if (nbd_can_accept()) { | |
394 | qio_net_listener_set_client_func(server, nbd_accept, NULL, NULL); | |
395 | } else { | |
396 | qio_net_listener_set_client_func(server, NULL, NULL, NULL); | |
397 | } | |
398 | } | |
399 | ||
400 | ||
401 | static SocketAddress *nbd_build_socket_address(const char *sockpath, | |
402 | const char *bindto, | |
403 | const char *port) | |
404 | { | |
405 | SocketAddress *saddr; | |
406 | ||
407 | saddr = g_new0(SocketAddress, 1); | |
408 | if (sockpath) { | |
409 | saddr->type = SOCKET_ADDRESS_TYPE_UNIX; | |
410 | saddr->u.q_unix.path = g_strdup(sockpath); | |
411 | } else { | |
412 | InetSocketAddress *inet; | |
413 | saddr->type = SOCKET_ADDRESS_TYPE_INET; | |
414 | inet = &saddr->u.inet; | |
415 | inet->host = g_strdup(bindto); | |
416 | if (port) { | |
417 | inet->port = g_strdup(port); | |
418 | } else { | |
419 | inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT); | |
420 | } | |
421 | } | |
422 | ||
423 | return saddr; | |
424 | } | |
425 | ||
426 | ||
427 | static QemuOptsList file_opts = { | |
428 | .name = "file", | |
429 | .implied_opt_name = "file", | |
430 | .head = QTAILQ_HEAD_INITIALIZER(file_opts.head), | |
431 | .desc = { | |
432 | /* no elements => accept any params */ | |
433 | { /* end of list */ } | |
434 | }, | |
435 | }; | |
436 | ||
437 | static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, bool list, | |
438 | Error **errp) | |
439 | { | |
440 | Object *obj; | |
441 | QCryptoTLSCreds *creds; | |
442 | ||
443 | obj = object_resolve_path_component( | |
444 | object_get_objects_root(), id); | |
445 | if (!obj) { | |
446 | error_setg(errp, "No TLS credentials with id '%s'", | |
447 | id); | |
448 | return NULL; | |
449 | } | |
450 | creds = (QCryptoTLSCreds *) | |
451 | object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS); | |
452 | if (!creds) { | |
453 | error_setg(errp, "Object with id '%s' is not TLS credentials", | |
454 | id); | |
455 | return NULL; | |
456 | } | |
457 | ||
458 | if (!qcrypto_tls_creds_check_endpoint(creds, | |
459 | list | |
460 | ? QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT | |
461 | : QCRYPTO_TLS_CREDS_ENDPOINT_SERVER, | |
462 | errp)) { | |
463 | return NULL; | |
464 | } | |
465 | object_ref(obj); | |
466 | return creds; | |
467 | } | |
468 | ||
469 | static void setup_address_and_port(const char **address, const char **port) | |
470 | { | |
471 | if (*address == NULL) { | |
472 | *address = "0.0.0.0"; | |
473 | } | |
474 | ||
475 | if (*port == NULL) { | |
476 | *port = stringify(NBD_DEFAULT_PORT); | |
477 | } | |
478 | } | |
479 | ||
480 | /* | |
481 | * Check socket parameters compatibility when socket activation is used. | |
482 | */ | |
483 | static const char *socket_activation_validate_opts(const char *device, | |
484 | const char *sockpath, | |
485 | const char *address, | |
486 | const char *port, | |
487 | const char *selinux, | |
488 | bool list) | |
489 | { | |
490 | if (device != NULL) { | |
491 | return "NBD device can't be set when using socket activation"; | |
492 | } | |
493 | ||
494 | if (sockpath != NULL) { | |
495 | return "Unix socket can't be set when using socket activation"; | |
496 | } | |
497 | ||
498 | if (address != NULL) { | |
499 | return "The interface can't be set when using socket activation"; | |
500 | } | |
501 | ||
502 | if (port != NULL) { | |
503 | return "TCP port number can't be set when using socket activation"; | |
504 | } | |
505 | ||
506 | if (selinux != NULL) { | |
507 | return "SELinux label can't be set when using socket activation"; | |
508 | } | |
509 | ||
510 | if (list) { | |
511 | return "List mode is incompatible with socket activation"; | |
512 | } | |
513 | ||
514 | return NULL; | |
515 | } | |
516 | ||
517 | static void qemu_nbd_shutdown(void) | |
518 | { | |
519 | job_cancel_sync_all(); | |
520 | blk_exp_close_all(); | |
521 | bdrv_close_all(); | |
522 | } | |
523 | ||
524 | int main(int argc, char **argv) | |
525 | { | |
526 | BlockBackend *blk; | |
527 | BlockDriverState *bs; | |
528 | uint64_t dev_offset = 0; | |
529 | bool readonly = false; | |
530 | bool disconnect = false; | |
531 | const char *bindto = NULL; | |
532 | const char *port = NULL; | |
533 | char *sockpath = NULL; | |
534 | QemuOpts *sn_opts = NULL; | |
535 | const char *sn_id_or_name = NULL; | |
536 | const char *sopt = "hVb:o:p:rsnc:dvk:e:f:tl:x:T:D:AB:L"; | |
537 | struct option lopt[] = { | |
538 | { "help", no_argument, NULL, 'h' }, | |
539 | { "version", no_argument, NULL, 'V' }, | |
540 | { "bind", required_argument, NULL, 'b' }, | |
541 | { "port", required_argument, NULL, 'p' }, | |
542 | { "socket", required_argument, NULL, 'k' }, | |
543 | { "offset", required_argument, NULL, 'o' }, | |
544 | { "read-only", no_argument, NULL, 'r' }, | |
545 | { "allocation-depth", no_argument, NULL, 'A' }, | |
546 | { "bitmap", required_argument, NULL, 'B' }, | |
547 | { "connect", required_argument, NULL, 'c' }, | |
548 | { "disconnect", no_argument, NULL, 'd' }, | |
549 | { "list", no_argument, NULL, 'L' }, | |
550 | { "snapshot", no_argument, NULL, 's' }, | |
551 | { "load-snapshot", required_argument, NULL, 'l' }, | |
552 | { "nocache", no_argument, NULL, 'n' }, | |
553 | { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE }, | |
554 | { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO }, | |
555 | { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD }, | |
556 | { "detect-zeroes", required_argument, NULL, | |
557 | QEMU_NBD_OPT_DETECT_ZEROES }, | |
558 | { "shared", required_argument, NULL, 'e' }, | |
559 | { "format", required_argument, NULL, 'f' }, | |
560 | { "persistent", no_argument, NULL, 't' }, | |
561 | { "verbose", no_argument, NULL, 'v' }, | |
562 | { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT }, | |
563 | { "export-name", required_argument, NULL, 'x' }, | |
564 | { "description", required_argument, NULL, 'D' }, | |
565 | { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS }, | |
566 | { "tls-hostname", required_argument, NULL, QEMU_NBD_OPT_TLSHOSTNAME }, | |
567 | { "tls-authz", required_argument, NULL, QEMU_NBD_OPT_TLSAUTHZ }, | |
568 | { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS }, | |
569 | { "trace", required_argument, NULL, 'T' }, | |
570 | { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK }, | |
571 | { "pid-file", required_argument, NULL, QEMU_NBD_OPT_PID_FILE }, | |
572 | { "selinux-label", required_argument, NULL, | |
573 | QEMU_NBD_OPT_SELINUX_LABEL }, | |
574 | { NULL, 0, NULL, 0 } | |
575 | }; | |
576 | int ch; | |
577 | int opt_ind = 0; | |
578 | int flags = BDRV_O_RDWR; | |
579 | int ret = 0; | |
580 | bool seen_cache = false; | |
581 | bool seen_discard = false; | |
582 | bool seen_aio = false; | |
583 | pthread_t client_thread; | |
584 | const char *fmt = NULL; | |
585 | Error *local_err = NULL; | |
586 | BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; | |
587 | QDict *options = NULL; | |
588 | const char *export_name = NULL; /* defaults to "" later for server mode */ | |
589 | const char *export_description = NULL; | |
590 | BlockDirtyBitmapOrStrList *bitmaps = NULL; | |
591 | bool alloc_depth = false; | |
592 | const char *tlscredsid = NULL; | |
593 | const char *tlshostname = NULL; | |
594 | bool imageOpts = false; | |
595 | bool writethrough = false; /* Client will flush as needed. */ | |
596 | bool list = false; | |
597 | unsigned socket_activation; | |
598 | const char *pid_file_name = NULL; | |
599 | const char *selinux_label = NULL; | |
600 | BlockExportOptions *export_opts; | |
601 | struct NbdClientOpts opts = { | |
602 | .fork_process = false, | |
603 | .verbose = false, | |
604 | .device = NULL, | |
605 | .srcpath = NULL, | |
606 | .saddr = NULL, | |
607 | .old_stderr = STDOUT_FILENO, | |
608 | }; | |
609 | ||
610 | #ifdef CONFIG_POSIX | |
611 | os_setup_early_signal_handling(); | |
612 | os_setup_signal_handling(); | |
613 | #endif | |
614 | ||
615 | socket_init(); | |
616 | error_init(argv[0]); | |
617 | module_call_init(MODULE_INIT_TRACE); | |
618 | qcrypto_init(&error_fatal); | |
619 | ||
620 | module_call_init(MODULE_INIT_QOM); | |
621 | qemu_add_opts(&qemu_trace_opts); | |
622 | qemu_init_exec_dir(argv[0]); | |
623 | ||
624 | while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { | |
625 | switch (ch) { | |
626 | case 's': | |
627 | flags |= BDRV_O_SNAPSHOT; | |
628 | break; | |
629 | case 'n': | |
630 | optarg = (char *) "none"; | |
631 | /* fallthrough */ | |
632 | case QEMU_NBD_OPT_CACHE: | |
633 | if (seen_cache) { | |
634 | error_report("-n and --cache can only be specified once"); | |
635 | exit(EXIT_FAILURE); | |
636 | } | |
637 | seen_cache = true; | |
638 | if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) { | |
639 | error_report("Invalid cache mode `%s'", optarg); | |
640 | exit(EXIT_FAILURE); | |
641 | } | |
642 | break; | |
643 | case QEMU_NBD_OPT_AIO: | |
644 | if (seen_aio) { | |
645 | error_report("--aio can only be specified once"); | |
646 | exit(EXIT_FAILURE); | |
647 | } | |
648 | seen_aio = true; | |
649 | if (bdrv_parse_aio(optarg, &flags) < 0) { | |
650 | error_report("Invalid aio mode '%s'", optarg); | |
651 | exit(EXIT_FAILURE); | |
652 | } | |
653 | break; | |
654 | case QEMU_NBD_OPT_DISCARD: | |
655 | if (seen_discard) { | |
656 | error_report("--discard can only be specified once"); | |
657 | exit(EXIT_FAILURE); | |
658 | } | |
659 | seen_discard = true; | |
660 | if (bdrv_parse_discard_flags(optarg, &flags) == -1) { | |
661 | error_report("Invalid discard mode `%s'", optarg); | |
662 | exit(EXIT_FAILURE); | |
663 | } | |
664 | break; | |
665 | case QEMU_NBD_OPT_DETECT_ZEROES: | |
666 | detect_zeroes = | |
667 | qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, | |
668 | optarg, | |
669 | BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, | |
670 | &local_err); | |
671 | if (local_err) { | |
672 | error_reportf_err(local_err, | |
673 | "Failed to parse detect_zeroes mode: "); | |
674 | exit(EXIT_FAILURE); | |
675 | } | |
676 | if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && | |
677 | !(flags & BDRV_O_UNMAP)) { | |
678 | error_report("setting detect-zeroes to unmap is not allowed " | |
679 | "without setting discard operation to unmap"); | |
680 | exit(EXIT_FAILURE); | |
681 | } | |
682 | break; | |
683 | case 'b': | |
684 | bindto = optarg; | |
685 | break; | |
686 | case 'p': | |
687 | port = optarg; | |
688 | break; | |
689 | case 'o': | |
690 | if (qemu_strtou64(optarg, NULL, 0, &dev_offset) < 0) { | |
691 | error_report("Invalid offset '%s'", optarg); | |
692 | exit(EXIT_FAILURE); | |
693 | } | |
694 | break; | |
695 | case 'l': | |
696 | if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) { | |
697 | sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts, | |
698 | optarg, false); | |
699 | if (!sn_opts) { | |
700 | error_report("Failed in parsing snapshot param `%s'", | |
701 | optarg); | |
702 | exit(EXIT_FAILURE); | |
703 | } | |
704 | } else { | |
705 | sn_id_or_name = optarg; | |
706 | } | |
707 | /* fall through */ | |
708 | case 'r': | |
709 | readonly = true; | |
710 | flags &= ~BDRV_O_RDWR; | |
711 | break; | |
712 | case 'A': | |
713 | alloc_depth = true; | |
714 | break; | |
715 | case 'B': | |
716 | { | |
717 | BlockDirtyBitmapOrStr *el = g_new(BlockDirtyBitmapOrStr, 1); | |
718 | *el = (BlockDirtyBitmapOrStr) { | |
719 | .type = QTYPE_QSTRING, | |
720 | .u.local = g_strdup(optarg), | |
721 | }; | |
722 | QAPI_LIST_PREPEND(bitmaps, el); | |
723 | } | |
724 | break; | |
725 | case 'k': | |
726 | sockpath = optarg; | |
727 | if (sockpath[0] != '/') { | |
728 | error_report("socket path must be absolute"); | |
729 | exit(EXIT_FAILURE); | |
730 | } | |
731 | break; | |
732 | case 'd': | |
733 | disconnect = true; | |
734 | break; | |
735 | case 'c': | |
736 | opts.device = optarg; | |
737 | break; | |
738 | case 'e': | |
739 | if (qemu_strtoi(optarg, NULL, 0, &shared) < 0 || | |
740 | shared < 0) { | |
741 | error_report("Invalid shared device number '%s'", optarg); | |
742 | exit(EXIT_FAILURE); | |
743 | } | |
744 | break; | |
745 | case 'f': | |
746 | fmt = optarg; | |
747 | break; | |
748 | case 't': | |
749 | persistent = 1; | |
750 | break; | |
751 | case 'x': | |
752 | export_name = optarg; | |
753 | if (strlen(export_name) > NBD_MAX_STRING_SIZE) { | |
754 | error_report("export name '%s' too long", export_name); | |
755 | exit(EXIT_FAILURE); | |
756 | } | |
757 | break; | |
758 | case 'D': | |
759 | export_description = optarg; | |
760 | if (strlen(export_description) > NBD_MAX_STRING_SIZE) { | |
761 | error_report("export description '%s' too long", | |
762 | export_description); | |
763 | exit(EXIT_FAILURE); | |
764 | } | |
765 | break; | |
766 | case 'v': | |
767 | opts.verbose = true; | |
768 | break; | |
769 | case 'V': | |
770 | version(argv[0]); | |
771 | exit(0); | |
772 | break; | |
773 | case 'h': | |
774 | usage(argv[0]); | |
775 | exit(0); | |
776 | break; | |
777 | case '?': | |
778 | error_report("Try `%s --help' for more information.", argv[0]); | |
779 | exit(EXIT_FAILURE); | |
780 | case QEMU_NBD_OPT_OBJECT: | |
781 | user_creatable_process_cmdline(optarg); | |
782 | break; | |
783 | case QEMU_NBD_OPT_TLSCREDS: | |
784 | tlscredsid = optarg; | |
785 | break; | |
786 | case QEMU_NBD_OPT_TLSHOSTNAME: | |
787 | tlshostname = optarg; | |
788 | break; | |
789 | case QEMU_NBD_OPT_IMAGE_OPTS: | |
790 | imageOpts = true; | |
791 | break; | |
792 | case 'T': | |
793 | trace_opt_parse(optarg); | |
794 | break; | |
795 | case QEMU_NBD_OPT_TLSAUTHZ: | |
796 | tlsauthz = optarg; | |
797 | break; | |
798 | case QEMU_NBD_OPT_FORK: | |
799 | opts.fork_process = true; | |
800 | break; | |
801 | case 'L': | |
802 | list = true; | |
803 | break; | |
804 | case QEMU_NBD_OPT_PID_FILE: | |
805 | pid_file_name = optarg; | |
806 | break; | |
807 | case QEMU_NBD_OPT_SELINUX_LABEL: | |
808 | selinux_label = optarg; | |
809 | break; | |
810 | } | |
811 | } | |
812 | ||
813 | if (list) { | |
814 | if (argc != optind) { | |
815 | error_report("List mode is incompatible with a file name"); | |
816 | exit(EXIT_FAILURE); | |
817 | } | |
818 | if (export_name || export_description || dev_offset || | |
819 | opts.device || disconnect || fmt || sn_id_or_name || bitmaps || | |
820 | alloc_depth || seen_aio || seen_discard || seen_cache) { | |
821 | error_report("List mode is incompatible with per-device settings"); | |
822 | exit(EXIT_FAILURE); | |
823 | } | |
824 | if (opts.fork_process) { | |
825 | error_report("List mode is incompatible with forking"); | |
826 | exit(EXIT_FAILURE); | |
827 | } | |
828 | } else if ((argc - optind) != 1) { | |
829 | error_report("Invalid number of arguments"); | |
830 | error_printf("Try `%s --help' for more information.\n", argv[0]); | |
831 | exit(EXIT_FAILURE); | |
832 | } else if (!export_name) { | |
833 | export_name = ""; | |
834 | } | |
835 | ||
836 | if (!trace_init_backends()) { | |
837 | exit(1); | |
838 | } | |
839 | trace_init_file(); | |
840 | qemu_set_log(LOG_TRACE, &error_fatal); | |
841 | ||
842 | socket_activation = check_socket_activation(); | |
843 | if (socket_activation == 0) { | |
844 | if (!sockpath) { | |
845 | setup_address_and_port(&bindto, &port); | |
846 | } | |
847 | } else { | |
848 | /* Using socket activation - check user didn't use -p etc. */ | |
849 | const char *err_msg = socket_activation_validate_opts(opts.device, | |
850 | sockpath, | |
851 | bindto, port, | |
852 | selinux_label, | |
853 | list); | |
854 | if (err_msg != NULL) { | |
855 | error_report("%s", err_msg); | |
856 | exit(EXIT_FAILURE); | |
857 | } | |
858 | ||
859 | /* qemu-nbd can only listen on a single socket. */ | |
860 | if (socket_activation > 1) { | |
861 | error_report("qemu-nbd does not support socket activation with %s > 1", | |
862 | "LISTEN_FDS"); | |
863 | exit(EXIT_FAILURE); | |
864 | } | |
865 | } | |
866 | ||
867 | if (tlscredsid) { | |
868 | if (opts.device) { | |
869 | error_report("TLS is not supported with a host device"); | |
870 | exit(EXIT_FAILURE); | |
871 | } | |
872 | if (tlsauthz && list) { | |
873 | error_report("TLS authorization is incompatible with export list"); | |
874 | exit(EXIT_FAILURE); | |
875 | } | |
876 | if (tlshostname && !list) { | |
877 | error_report("TLS hostname is only supported with export list"); | |
878 | exit(EXIT_FAILURE); | |
879 | } | |
880 | tlscreds = nbd_get_tls_creds(tlscredsid, list, &local_err); | |
881 | if (local_err) { | |
882 | error_reportf_err(local_err, "Failed to get TLS creds: "); | |
883 | exit(EXIT_FAILURE); | |
884 | } | |
885 | } else { | |
886 | if (tlsauthz) { | |
887 | error_report("--tls-authz is not permitted without --tls-creds"); | |
888 | exit(EXIT_FAILURE); | |
889 | } | |
890 | if (tlshostname) { | |
891 | error_report("--tls-hostname is not permitted without --tls-creds"); | |
892 | exit(EXIT_FAILURE); | |
893 | } | |
894 | } | |
895 | ||
896 | if (selinux_label) { | |
897 | #ifdef CONFIG_SELINUX | |
898 | if (sockpath == NULL && opts.device == NULL) { | |
899 | error_report("--selinux-label is not permitted without --socket"); | |
900 | exit(EXIT_FAILURE); | |
901 | } | |
902 | #else | |
903 | error_report("SELinux support not enabled in this binary"); | |
904 | exit(EXIT_FAILURE); | |
905 | #endif | |
906 | } | |
907 | ||
908 | if (list) { | |
909 | opts.saddr = nbd_build_socket_address(sockpath, bindto, port); | |
910 | return qemu_nbd_client_list(opts.saddr, tlscreds, | |
911 | tlshostname ? tlshostname : bindto); | |
912 | } | |
913 | ||
914 | #if !HAVE_NBD_DEVICE | |
915 | if (disconnect || opts.device) { | |
916 | error_report("Kernel /dev/nbdN support not available"); | |
917 | exit(EXIT_FAILURE); | |
918 | } | |
919 | #else /* HAVE_NBD_DEVICE */ | |
920 | if (disconnect) { | |
921 | int nbdfd = open(argv[optind], O_RDWR); | |
922 | if (nbdfd < 0) { | |
923 | error_report("Cannot open %s: %s", argv[optind], | |
924 | strerror(errno)); | |
925 | exit(EXIT_FAILURE); | |
926 | } | |
927 | nbd_disconnect(nbdfd); | |
928 | ||
929 | close(nbdfd); | |
930 | ||
931 | printf("%s disconnected\n", argv[optind]); | |
932 | ||
933 | return 0; | |
934 | } | |
935 | #endif | |
936 | ||
937 | if ((opts.device && !opts.verbose) || opts.fork_process) { | |
938 | #ifndef WIN32 | |
939 | g_autoptr(GError) err = NULL; | |
940 | int stderr_fd[2]; | |
941 | pid_t pid; | |
942 | ||
943 | if (!g_unix_open_pipe(stderr_fd, FD_CLOEXEC, &err)) { | |
944 | error_report("Error setting up communication pipe: %s", | |
945 | err->message); | |
946 | exit(EXIT_FAILURE); | |
947 | } | |
948 | ||
949 | /* Now daemonize, but keep a communication channel open to | |
950 | * print errors and exit with the proper status code. | |
951 | */ | |
952 | pid = fork(); | |
953 | if (pid < 0) { | |
954 | error_report("Failed to fork: %s", strerror(errno)); | |
955 | exit(EXIT_FAILURE); | |
956 | } else if (pid == 0) { | |
957 | int saved_errno; | |
958 | ||
959 | close(stderr_fd[0]); | |
960 | ||
961 | /* Remember parent's stderr if we will be restoring it. */ | |
962 | if (opts.verbose /* fork_process is set */) { | |
963 | opts.old_stderr = dup(STDERR_FILENO); | |
964 | if (opts.old_stderr < 0) { | |
965 | error_report("Could not dup original stderr: %s", | |
966 | strerror(errno)); | |
967 | exit(EXIT_FAILURE); | |
968 | } | |
969 | } | |
970 | ||
971 | ret = qemu_daemon(1, 0); | |
972 | saved_errno = errno; /* dup2 will overwrite error below */ | |
973 | ||
974 | /* Temporarily redirect stderr to the parent's pipe... */ | |
975 | if (dup2(stderr_fd[1], STDERR_FILENO) < 0) { | |
976 | char str[256]; | |
977 | snprintf(str, sizeof(str), | |
978 | "%s: Failed to link stderr to the pipe: %s\n", | |
979 | g_get_prgname(), strerror(errno)); | |
980 | /* | |
981 | * We are unable to use error_report() here as we need to get | |
982 | * stderr pointed to the parent's pipe. Write to that pipe | |
983 | * manually. | |
984 | */ | |
985 | ret = write(stderr_fd[1], str, strlen(str)); | |
986 | exit(EXIT_FAILURE); | |
987 | } | |
988 | ||
989 | if (ret < 0) { | |
990 | error_report("Failed to daemonize: %s", strerror(saved_errno)); | |
991 | exit(EXIT_FAILURE); | |
992 | } | |
993 | ||
994 | /* ... close the descriptor we inherited and go on. */ | |
995 | close(stderr_fd[1]); | |
996 | } else { | |
997 | bool errors = false; | |
998 | char *buf; | |
999 | ||
1000 | /* In the parent. Print error messages from the child until | |
1001 | * it closes the pipe. | |
1002 | */ | |
1003 | close(stderr_fd[1]); | |
1004 | buf = g_malloc(1024); | |
1005 | while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { | |
1006 | errors = true; | |
1007 | ret = qemu_write_full(STDERR_FILENO, buf, ret); | |
1008 | if (ret < 0) { | |
1009 | exit(EXIT_FAILURE); | |
1010 | } | |
1011 | } | |
1012 | if (ret < 0) { | |
1013 | error_report("Cannot read from daemon: %s", | |
1014 | strerror(errno)); | |
1015 | exit(EXIT_FAILURE); | |
1016 | } | |
1017 | ||
1018 | /* Usually the daemon should not print any message. | |
1019 | * Exit with zero status in that case. | |
1020 | */ | |
1021 | exit(errors); | |
1022 | } | |
1023 | #else /* WIN32 */ | |
1024 | error_report("Unable to fork into background on Windows hosts"); | |
1025 | exit(EXIT_FAILURE); | |
1026 | #endif /* WIN32 */ | |
1027 | } | |
1028 | ||
1029 | if (opts.device != NULL && sockpath == NULL) { | |
1030 | sockpath = g_malloc(128); | |
1031 | snprintf(sockpath, 128, SOCKET_PATH, basename(opts.device)); | |
1032 | } | |
1033 | ||
1034 | server = qio_net_listener_new(); | |
1035 | if (socket_activation == 0) { | |
1036 | int backlog; | |
1037 | ||
1038 | if (persistent || shared == 0) { | |
1039 | backlog = SOMAXCONN; | |
1040 | } else { | |
1041 | backlog = MIN(shared, SOMAXCONN); | |
1042 | } | |
1043 | #ifdef CONFIG_SELINUX | |
1044 | if (selinux_label && setsockcreatecon_raw(selinux_label) == -1) { | |
1045 | error_report("Cannot set SELinux socket create context to %s: %s", | |
1046 | selinux_label, strerror(errno)); | |
1047 | exit(EXIT_FAILURE); | |
1048 | } | |
1049 | #endif | |
1050 | opts.saddr = nbd_build_socket_address(sockpath, bindto, port); | |
1051 | if (qio_net_listener_open_sync(server, opts.saddr, backlog, | |
1052 | &local_err) < 0) { | |
1053 | object_unref(OBJECT(server)); | |
1054 | error_report_err(local_err); | |
1055 | exit(EXIT_FAILURE); | |
1056 | } | |
1057 | #ifdef CONFIG_SELINUX | |
1058 | if (selinux_label && setsockcreatecon_raw(NULL) == -1) { | |
1059 | error_report("Cannot clear SELinux socket create context: %s", | |
1060 | strerror(errno)); | |
1061 | exit(EXIT_FAILURE); | |
1062 | } | |
1063 | #endif | |
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_reportf_err(local_err, | |
1074 | "Failed to use socket activation: "); | |
1075 | exit(EXIT_FAILURE); | |
1076 | } | |
1077 | qio_net_listener_add(server, sioc); | |
1078 | object_unref(OBJECT(sioc)); | |
1079 | } | |
1080 | } | |
1081 | ||
1082 | qemu_init_main_loop(&error_fatal); | |
1083 | bdrv_init(); | |
1084 | atexit(qemu_nbd_shutdown); | |
1085 | ||
1086 | opts.srcpath = argv[optind]; | |
1087 | if (imageOpts) { | |
1088 | QemuOpts *o; | |
1089 | if (fmt) { | |
1090 | error_report("--image-opts and -f are mutually exclusive"); | |
1091 | exit(EXIT_FAILURE); | |
1092 | } | |
1093 | o = qemu_opts_parse_noisily(&file_opts, opts.srcpath, true); | |
1094 | if (!o) { | |
1095 | qemu_opts_reset(&file_opts); | |
1096 | exit(EXIT_FAILURE); | |
1097 | } | |
1098 | options = qemu_opts_to_qdict(o, NULL); | |
1099 | qemu_opts_reset(&file_opts); | |
1100 | blk = blk_new_open(NULL, NULL, options, flags, &local_err); | |
1101 | } else { | |
1102 | if (fmt) { | |
1103 | options = qdict_new(); | |
1104 | qdict_put_str(options, "driver", fmt); | |
1105 | } | |
1106 | blk = blk_new_open(opts.srcpath, NULL, options, flags, &local_err); | |
1107 | } | |
1108 | ||
1109 | if (!blk) { | |
1110 | error_reportf_err(local_err, "Failed to blk_new_open '%s': ", | |
1111 | argv[optind]); | |
1112 | exit(EXIT_FAILURE); | |
1113 | } | |
1114 | bs = blk_bs(blk); | |
1115 | ||
1116 | if (dev_offset) { | |
1117 | QDict *raw_opts = qdict_new(); | |
1118 | qdict_put_str(raw_opts, "driver", "raw"); | |
1119 | qdict_put_str(raw_opts, "file", bs->node_name); | |
1120 | qdict_put_int(raw_opts, "offset", dev_offset); | |
1121 | ||
1122 | aio_context_acquire(qemu_get_aio_context()); | |
1123 | bs = bdrv_open(NULL, NULL, raw_opts, flags, &error_fatal); | |
1124 | aio_context_release(qemu_get_aio_context()); | |
1125 | ||
1126 | blk_remove_bs(blk); | |
1127 | blk_insert_bs(blk, bs, &error_fatal); | |
1128 | bdrv_unref(bs); | |
1129 | } | |
1130 | ||
1131 | blk_set_enable_write_cache(blk, !writethrough); | |
1132 | ||
1133 | if (sn_opts) { | |
1134 | ret = bdrv_snapshot_load_tmp(bs, | |
1135 | qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID), | |
1136 | qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME), | |
1137 | &local_err); | |
1138 | } else if (sn_id_or_name) { | |
1139 | ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name, | |
1140 | &local_err); | |
1141 | } | |
1142 | if (ret < 0) { | |
1143 | error_reportf_err(local_err, "Failed to load snapshot: "); | |
1144 | exit(EXIT_FAILURE); | |
1145 | } | |
1146 | ||
1147 | bs->detect_zeroes = detect_zeroes; | |
1148 | ||
1149 | nbd_server_is_qemu_nbd(shared); | |
1150 | ||
1151 | export_opts = g_new(BlockExportOptions, 1); | |
1152 | *export_opts = (BlockExportOptions) { | |
1153 | .type = BLOCK_EXPORT_TYPE_NBD, | |
1154 | .id = g_strdup("qemu-nbd-export"), | |
1155 | .node_name = g_strdup(bdrv_get_node_name(bs)), | |
1156 | .has_writethrough = true, | |
1157 | .writethrough = writethrough, | |
1158 | .has_writable = true, | |
1159 | .writable = !readonly, | |
1160 | .u.nbd = { | |
1161 | .name = g_strdup(export_name), | |
1162 | .description = g_strdup(export_description), | |
1163 | .has_bitmaps = !!bitmaps, | |
1164 | .bitmaps = bitmaps, | |
1165 | .has_allocation_depth = alloc_depth, | |
1166 | .allocation_depth = alloc_depth, | |
1167 | }, | |
1168 | }; | |
1169 | blk_exp_add(export_opts, &error_fatal); | |
1170 | qapi_free_BlockExportOptions(export_opts); | |
1171 | ||
1172 | if (opts.device) { | |
1173 | #if HAVE_NBD_DEVICE | |
1174 | ret = pthread_create(&client_thread, NULL, nbd_client_thread, &opts); | |
1175 | if (ret != 0) { | |
1176 | error_report("Failed to create client thread: %s", strerror(ret)); | |
1177 | exit(EXIT_FAILURE); | |
1178 | } | |
1179 | #endif | |
1180 | } else { | |
1181 | /* Shut up GCC warnings. */ | |
1182 | memset(&client_thread, 0, sizeof(client_thread)); | |
1183 | } | |
1184 | ||
1185 | nbd_update_server_watch(); | |
1186 | ||
1187 | if (pid_file_name) { | |
1188 | qemu_write_pidfile(pid_file_name, &error_fatal); | |
1189 | } | |
1190 | ||
1191 | /* now when the initialization is (almost) complete, chdir("/") | |
1192 | * to free any busy filesystems */ | |
1193 | if (chdir("/") < 0) { | |
1194 | error_report("Could not chdir to root directory: %s", | |
1195 | strerror(errno)); | |
1196 | exit(EXIT_FAILURE); | |
1197 | } | |
1198 | ||
1199 | if (opts.fork_process) { | |
1200 | nbd_client_release_pipe(opts.old_stderr); | |
1201 | } | |
1202 | ||
1203 | state = RUNNING; | |
1204 | do { | |
1205 | main_loop_wait(false); | |
1206 | if (state == TERMINATE) { | |
1207 | blk_exp_close_all(); | |
1208 | state = TERMINATED; | |
1209 | } | |
1210 | } while (state != TERMINATED); | |
1211 | ||
1212 | blk_unref(blk); | |
1213 | if (sockpath) { | |
1214 | unlink(sockpath); | |
1215 | } | |
1216 | ||
1217 | qemu_opts_del(sn_opts); | |
1218 | ||
1219 | if (opts.device) { | |
1220 | void *result; | |
1221 | pthread_join(client_thread, &result); | |
1222 | ret = (intptr_t)result; | |
1223 | exit(ret); | |
1224 | } else { | |
1225 | exit(EXIT_SUCCESS); | |
1226 | } | |
1227 | } |