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Commit | Line | Data |
---|---|---|
cd831bd7 | 1 | /* |
7a5ca864 FB |
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 | |
8167ee88 | 16 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
7a5ca864 FB |
17 | */ |
18 | ||
5a61cb60 | 19 | #include "qemu-common.h" |
737e150e PB |
20 | #include "block/block.h" |
21 | #include "block/nbd.h" | |
7a5ca864 | 22 | |
7a5ca864 FB |
23 | #include <stdarg.h> |
24 | #include <stdio.h> | |
25 | #include <getopt.h> | |
26 | #include <err.h> | |
cd831bd7 | 27 | #include <sys/types.h> |
7a5ca864 FB |
28 | #include <sys/socket.h> |
29 | #include <netinet/in.h> | |
30 | #include <netinet/tcp.h> | |
31 | #include <arpa/inet.h> | |
cd831bd7 | 32 | #include <signal.h> |
2bff4b6f | 33 | #include <libgen.h> |
a517e88b | 34 | #include <pthread.h> |
cd831bd7 | 35 | |
39a5235c PB |
36 | #define SOCKET_PATH "/var/lock/qemu-nbd-%s" |
37 | #define QEMU_NBD_OPT_CACHE 1 | |
38 | #define QEMU_NBD_OPT_AIO 2 | |
7a5ca864 | 39 | |
af49bbbe | 40 | static NBDExport *exp; |
b1d8e52e | 41 | static int verbose; |
a517e88b PB |
42 | static char *srcpath; |
43 | static char *sockpath; | |
7860a380 PB |
44 | static int persistent = 0; |
45 | static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state; | |
a61c6782 PB |
46 | static int shared = 1; |
47 | static int nb_fds; | |
7a5ca864 FB |
48 | |
49 | static void usage(const char *name) | |
50 | { | |
b033cd86 | 51 | (printf) ( |
7a5ca864 FB |
52 | "Usage: %s [OPTIONS] FILE\n" |
53 | "QEMU Disk Network Block Device Server\n" | |
54 | "\n" | |
b033cd86 PB |
55 | " -h, --help display this help and exit\n" |
56 | " -V, --version output version information and exit\n" | |
57 | "\n" | |
58 | "Connection properties:\n" | |
c2e2872b | 59 | " -p, --port=PORT port to listen on (default `%d')\n" |
7a5ca864 | 60 | " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" |
cd831bd7 TS |
61 | " -k, --socket=PATH path to the unix socket\n" |
62 | " (default '"SOCKET_PATH"')\n" | |
3b05a8e9 | 63 | " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" |
75818250 | 64 | " -t, --persistent don't exit on the last connection\n" |
7a5ca864 | 65 | " -v, --verbose display extra debugging information\n" |
7a5ca864 | 66 | "\n" |
b033cd86 PB |
67 | "Exposing part of the image:\n" |
68 | " -o, --offset=OFFSET offset into the image\n" | |
69 | " -P, --partition=NUM only expose partition NUM\n" | |
70 | "\n" | |
71 | #ifdef __linux__ | |
72 | "Kernel NBD client support:\n" | |
73 | " -c, --connect=DEV connect FILE to the local NBD device DEV\n" | |
74 | " -d, --disconnect disconnect the specified device\n" | |
75 | "\n" | |
76 | #endif | |
77 | "\n" | |
78 | "Block device options:\n" | |
79 | " -r, --read-only export read-only\n" | |
80 | " -s, --snapshot use snapshot file\n" | |
81 | " -n, --nocache disable host cache\n" | |
39a5235c PB |
82 | " --cache=MODE set cache mode (none, writeback, ...)\n" |
83 | #ifdef CONFIG_LINUX_AIO | |
84 | " --aio=MODE set AIO mode (native or threads)\n" | |
85 | #endif | |
b033cd86 PB |
86 | "\n" |
87 | "Report bugs to <qemu-devel@nongnu.org>\n" | |
c2e2872b | 88 | , name, NBD_DEFAULT_PORT, "DEVICE"); |
7a5ca864 FB |
89 | } |
90 | ||
91 | static void version(const char *name) | |
92 | { | |
93 | printf( | |
315bc7aa | 94 | "%s version 0.0.1\n" |
7a5ca864 FB |
95 | "Written by Anthony Liguori.\n" |
96 | "\n" | |
97 | "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n" | |
98 | "This is free software; see the source for copying conditions. There is NO\n" | |
99 | "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" | |
315bc7aa | 100 | , name); |
7a5ca864 FB |
101 | } |
102 | ||
103 | struct partition_record | |
104 | { | |
105 | uint8_t bootable; | |
106 | uint8_t start_head; | |
107 | uint32_t start_cylinder; | |
108 | uint8_t start_sector; | |
109 | uint8_t system; | |
110 | uint8_t end_head; | |
111 | uint8_t end_cylinder; | |
112 | uint8_t end_sector; | |
113 | uint32_t start_sector_abs; | |
114 | uint32_t nb_sectors_abs; | |
115 | }; | |
116 | ||
117 | static void read_partition(uint8_t *p, struct partition_record *r) | |
118 | { | |
119 | r->bootable = p[0]; | |
120 | r->start_head = p[1]; | |
121 | r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); | |
122 | r->start_sector = p[2] & 0x3f; | |
123 | r->system = p[4]; | |
124 | r->end_head = p[5]; | |
125 | r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); | |
126 | r->end_sector = p[6] & 0x3f; | |
127 | r->start_sector_abs = p[8] | p[9] << 8 | p[10] << 16 | p[11] << 24; | |
128 | r->nb_sectors_abs = p[12] | p[13] << 8 | p[14] << 16 | p[15] << 24; | |
129 | } | |
130 | ||
131 | static int find_partition(BlockDriverState *bs, int partition, | |
132 | off_t *offset, off_t *size) | |
133 | { | |
134 | struct partition_record mbr[4]; | |
135 | uint8_t data[512]; | |
136 | int i; | |
137 | int ext_partnum = 4; | |
cb7cf0e3 | 138 | int ret; |
7a5ca864 | 139 | |
cb7cf0e3 RO |
140 | if ((ret = bdrv_read(bs, 0, data, 1)) < 0) { |
141 | errno = -ret; | |
142 | err(EXIT_FAILURE, "error while reading"); | |
143 | } | |
7a5ca864 FB |
144 | |
145 | if (data[510] != 0x55 || data[511] != 0xaa) { | |
185b4338 | 146 | return -EINVAL; |
7a5ca864 FB |
147 | } |
148 | ||
149 | for (i = 0; i < 4; i++) { | |
150 | read_partition(&data[446 + 16 * i], &mbr[i]); | |
151 | ||
152 | if (!mbr[i].nb_sectors_abs) | |
153 | continue; | |
154 | ||
155 | if (mbr[i].system == 0xF || mbr[i].system == 0x5) { | |
156 | struct partition_record ext[4]; | |
157 | uint8_t data1[512]; | |
158 | int j; | |
159 | ||
cb7cf0e3 RO |
160 | if ((ret = bdrv_read(bs, mbr[i].start_sector_abs, data1, 1)) < 0) { |
161 | errno = -ret; | |
162 | err(EXIT_FAILURE, "error while reading"); | |
163 | } | |
7a5ca864 FB |
164 | |
165 | for (j = 0; j < 4; j++) { | |
166 | read_partition(&data1[446 + 16 * j], &ext[j]); | |
167 | if (!ext[j].nb_sectors_abs) | |
168 | continue; | |
169 | ||
170 | if ((ext_partnum + j + 1) == partition) { | |
171 | *offset = (uint64_t)ext[j].start_sector_abs << 9; | |
172 | *size = (uint64_t)ext[j].nb_sectors_abs << 9; | |
173 | return 0; | |
174 | } | |
175 | } | |
176 | ext_partnum += 4; | |
177 | } else if ((i + 1) == partition) { | |
178 | *offset = (uint64_t)mbr[i].start_sector_abs << 9; | |
179 | *size = (uint64_t)mbr[i].nb_sectors_abs << 9; | |
180 | return 0; | |
181 | } | |
182 | } | |
183 | ||
185b4338 | 184 | return -ENOENT; |
7a5ca864 FB |
185 | } |
186 | ||
bb345110 PB |
187 | static void termsig_handler(int signum) |
188 | { | |
7860a380 | 189 | state = TERMINATE; |
a61c6782 | 190 | qemu_notify_event(); |
bb345110 PB |
191 | } |
192 | ||
a517e88b | 193 | static void *show_parts(void *arg) |
cd831bd7 | 194 | { |
a6ac2313 | 195 | char *device = arg; |
a517e88b PB |
196 | int nbd; |
197 | ||
198 | /* linux just needs an open() to trigger | |
199 | * the partition table update | |
200 | * but remember to load the module with max_part != 0 : | |
201 | * modprobe nbd max_part=63 | |
202 | */ | |
203 | nbd = open(device, O_RDWR); | |
fc19f8a0 | 204 | if (nbd >= 0) { |
a517e88b PB |
205 | close(nbd); |
206 | } | |
207 | return NULL; | |
208 | } | |
cd831bd7 | 209 | |
a517e88b PB |
210 | static void *nbd_client_thread(void *arg) |
211 | { | |
a6ac2313 | 212 | char *device = arg; |
a517e88b PB |
213 | off_t size; |
214 | size_t blocksize; | |
215 | uint32_t nbdflags; | |
a6ac2313 | 216 | int fd, sock; |
a517e88b PB |
217 | int ret; |
218 | pthread_t show_parts_thread; | |
219 | ||
dc10e8b3 | 220 | sock = unix_socket_outgoing(sockpath); |
fc19f8a0 | 221 | if (sock < 0) { |
dc10e8b3 SH |
222 | goto out; |
223 | } | |
a517e88b PB |
224 | |
225 | ret = nbd_receive_negotiate(sock, NULL, &nbdflags, | |
226 | &size, &blocksize); | |
fc19f8a0 | 227 | if (ret < 0) { |
a517e88b PB |
228 | goto out; |
229 | } | |
230 | ||
a6ac2313 | 231 | fd = open(device, O_RDWR); |
fc19f8a0 | 232 | if (fd < 0) { |
a6ac2313 PB |
233 | /* Linux-only, we can use %m in printf. */ |
234 | fprintf(stderr, "Failed to open %s: %m", device); | |
235 | goto out; | |
236 | } | |
237 | ||
a517e88b | 238 | ret = nbd_init(fd, sock, nbdflags, size, blocksize); |
fc19f8a0 | 239 | if (ret < 0) { |
a517e88b PB |
240 | goto out; |
241 | } | |
242 | ||
243 | /* update partition table */ | |
a6ac2313 | 244 | pthread_create(&show_parts_thread, NULL, show_parts, device); |
a517e88b | 245 | |
c1f8fdc3 PB |
246 | if (verbose) { |
247 | fprintf(stderr, "NBD device %s is now connected to %s\n", | |
248 | device, srcpath); | |
249 | } else { | |
250 | /* Close stderr so that the qemu-nbd process exits. */ | |
251 | dup2(STDOUT_FILENO, STDERR_FILENO); | |
252 | } | |
a517e88b PB |
253 | |
254 | ret = nbd_client(fd); | |
255 | if (ret) { | |
256 | goto out; | |
cd831bd7 | 257 | } |
a517e88b PB |
258 | close(fd); |
259 | kill(getpid(), SIGTERM); | |
260 | return (void *) EXIT_SUCCESS; | |
261 | ||
262 | out: | |
263 | kill(getpid(), SIGTERM); | |
264 | return (void *) EXIT_FAILURE; | |
cd831bd7 TS |
265 | } |
266 | ||
a61c6782 PB |
267 | static int nbd_can_accept(void *opaque) |
268 | { | |
269 | return nb_fds < shared; | |
270 | } | |
271 | ||
7860a380 PB |
272 | static void nbd_export_closed(NBDExport *exp) |
273 | { | |
274 | assert(state == TERMINATING); | |
275 | state = TERMINATED; | |
276 | } | |
277 | ||
1743b515 | 278 | static void nbd_client_closed(NBDClient *client) |
a61c6782 | 279 | { |
1743b515 | 280 | nb_fds--; |
7860a380 PB |
281 | if (nb_fds == 0 && !persistent && state == RUNNING) { |
282 | state = TERMINATE; | |
283 | } | |
1743b515 | 284 | qemu_notify_event(); |
7860a380 | 285 | nbd_client_put(client); |
a61c6782 PB |
286 | } |
287 | ||
288 | static void nbd_accept(void *opaque) | |
289 | { | |
290 | int server_fd = (uintptr_t) opaque; | |
291 | struct sockaddr_in addr; | |
292 | socklen_t addr_len = sizeof(addr); | |
293 | ||
294 | int fd = accept(server_fd, (struct sockaddr *)&addr, &addr_len); | |
7860a380 PB |
295 | if (state >= TERMINATE) { |
296 | close(fd); | |
297 | return; | |
298 | } | |
299 | ||
fc19f8a0 | 300 | if (fd >= 0 && nbd_client_new(exp, fd, nbd_client_closed)) { |
a61c6782 PB |
301 | nb_fds++; |
302 | } | |
303 | } | |
304 | ||
7a5ca864 FB |
305 | int main(int argc, char **argv) |
306 | { | |
307 | BlockDriverState *bs; | |
308 | off_t dev_offset = 0; | |
b90fb4b8 | 309 | uint32_t nbdflags = 0; |
cd831bd7 | 310 | bool disconnect = false; |
7a5ca864 | 311 | const char *bindto = "0.0.0.0"; |
a6ac2313 | 312 | char *device = NULL; |
c2e2872b | 313 | int port = NBD_DEFAULT_PORT; |
7a5ca864 | 314 | off_t fd_size; |
d6aa671f | 315 | const char *sopt = "hVb:o:p:rsnP:c:dvk:e:t"; |
7a5ca864 | 316 | struct option lopt[] = { |
660f11be BS |
317 | { "help", 0, NULL, 'h' }, |
318 | { "version", 0, NULL, 'V' }, | |
319 | { "bind", 1, NULL, 'b' }, | |
320 | { "port", 1, NULL, 'p' }, | |
321 | { "socket", 1, NULL, 'k' }, | |
322 | { "offset", 1, NULL, 'o' }, | |
323 | { "read-only", 0, NULL, 'r' }, | |
324 | { "partition", 1, NULL, 'P' }, | |
325 | { "connect", 1, NULL, 'c' }, | |
326 | { "disconnect", 0, NULL, 'd' }, | |
327 | { "snapshot", 0, NULL, 's' }, | |
328 | { "nocache", 0, NULL, 'n' }, | |
39a5235c PB |
329 | { "cache", 1, NULL, QEMU_NBD_OPT_CACHE }, |
330 | #ifdef CONFIG_LINUX_AIO | |
331 | { "aio", 1, NULL, QEMU_NBD_OPT_AIO }, | |
332 | #endif | |
660f11be BS |
333 | { "shared", 1, NULL, 'e' }, |
334 | { "persistent", 0, NULL, 't' }, | |
335 | { "verbose", 0, NULL, 'v' }, | |
336 | { NULL, 0, NULL, 0 } | |
7a5ca864 FB |
337 | }; |
338 | int ch; | |
339 | int opt_ind = 0; | |
340 | int li; | |
341 | char *end; | |
f5edb014 | 342 | int flags = BDRV_O_RDWR; |
7a5ca864 | 343 | int partition = -1; |
cd831bd7 | 344 | int ret; |
3b05a8e9 | 345 | int fd; |
39a5235c PB |
346 | bool seen_cache = false; |
347 | #ifdef CONFIG_LINUX_AIO | |
348 | bool seen_aio = false; | |
349 | #endif | |
a517e88b | 350 | pthread_t client_thread; |
7a5ca864 | 351 | |
a517e88b PB |
352 | /* The client thread uses SIGTERM to interrupt the server. A signal |
353 | * handler ensures that "qemu-nbd -v -c" exits with a nice status code. | |
354 | */ | |
bb345110 | 355 | struct sigaction sa_sigterm; |
bb345110 PB |
356 | memset(&sa_sigterm, 0, sizeof(sa_sigterm)); |
357 | sa_sigterm.sa_handler = termsig_handler; | |
358 | sigaction(SIGTERM, &sa_sigterm, NULL); | |
359 | ||
7a5ca864 FB |
360 | while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { |
361 | switch (ch) { | |
362 | case 's': | |
2f726488 TS |
363 | flags |= BDRV_O_SNAPSHOT; |
364 | break; | |
365 | case 'n': | |
39a5235c PB |
366 | optarg = (char *) "none"; |
367 | /* fallthrough */ | |
368 | case QEMU_NBD_OPT_CACHE: | |
369 | if (seen_cache) { | |
370 | errx(EXIT_FAILURE, "-n and --cache can only be specified once"); | |
371 | } | |
372 | seen_cache = true; | |
373 | if (bdrv_parse_cache_flags(optarg, &flags) == -1) { | |
374 | errx(EXIT_FAILURE, "Invalid cache mode `%s'", optarg); | |
375 | } | |
7a5ca864 | 376 | break; |
39a5235c PB |
377 | #ifdef CONFIG_LINUX_AIO |
378 | case QEMU_NBD_OPT_AIO: | |
379 | if (seen_aio) { | |
380 | errx(EXIT_FAILURE, "--aio can only be specified once"); | |
381 | } | |
382 | seen_aio = true; | |
383 | if (!strcmp(optarg, "native")) { | |
384 | flags |= BDRV_O_NATIVE_AIO; | |
385 | } else if (!strcmp(optarg, "threads")) { | |
386 | /* this is the default */ | |
387 | } else { | |
388 | errx(EXIT_FAILURE, "invalid aio mode `%s'", optarg); | |
389 | } | |
390 | break; | |
391 | #endif | |
7a5ca864 FB |
392 | case 'b': |
393 | bindto = optarg; | |
394 | break; | |
395 | case 'p': | |
396 | li = strtol(optarg, &end, 0); | |
397 | if (*end) { | |
b6353bea | 398 | errx(EXIT_FAILURE, "Invalid port `%s'", optarg); |
7a5ca864 FB |
399 | } |
400 | if (li < 1 || li > 65535) { | |
b6353bea | 401 | errx(EXIT_FAILURE, "Port out of range `%s'", optarg); |
7a5ca864 FB |
402 | } |
403 | port = (uint16_t)li; | |
404 | break; | |
405 | case 'o': | |
406 | dev_offset = strtoll (optarg, &end, 0); | |
407 | if (*end) { | |
b6353bea | 408 | errx(EXIT_FAILURE, "Invalid offset `%s'", optarg); |
7a5ca864 FB |
409 | } |
410 | if (dev_offset < 0) { | |
b6353bea | 411 | errx(EXIT_FAILURE, "Offset must be positive `%s'", optarg); |
7a5ca864 FB |
412 | } |
413 | break; | |
414 | case 'r': | |
b90fb4b8 | 415 | nbdflags |= NBD_FLAG_READ_ONLY; |
07108b29 | 416 | flags &= ~BDRV_O_RDWR; |
7a5ca864 FB |
417 | break; |
418 | case 'P': | |
419 | partition = strtol(optarg, &end, 0); | |
420 | if (*end) | |
b6353bea | 421 | errx(EXIT_FAILURE, "Invalid partition `%s'", optarg); |
7a5ca864 | 422 | if (partition < 1 || partition > 8) |
b6353bea | 423 | errx(EXIT_FAILURE, "Invalid partition %d", partition); |
7a5ca864 | 424 | break; |
cd831bd7 | 425 | case 'k': |
b32f6c28 PB |
426 | sockpath = optarg; |
427 | if (sockpath[0] != '/') | |
b6353bea | 428 | errx(EXIT_FAILURE, "socket path must be absolute\n"); |
cd831bd7 TS |
429 | break; |
430 | case 'd': | |
431 | disconnect = true; | |
432 | break; | |
433 | case 'c': | |
434 | device = optarg; | |
435 | break; | |
3b05a8e9 TS |
436 | case 'e': |
437 | shared = strtol(optarg, &end, 0); | |
438 | if (*end) { | |
b6353bea | 439 | errx(EXIT_FAILURE, "Invalid shared device number '%s'", optarg); |
3b05a8e9 TS |
440 | } |
441 | if (shared < 1) { | |
b6353bea | 442 | errx(EXIT_FAILURE, "Shared device number must be greater than 0\n"); |
3b05a8e9 TS |
443 | } |
444 | break; | |
75818250 TS |
445 | case 't': |
446 | persistent = 1; | |
447 | break; | |
7a5ca864 FB |
448 | case 'v': |
449 | verbose = 1; | |
450 | break; | |
451 | case 'V': | |
452 | version(argv[0]); | |
453 | exit(0); | |
454 | break; | |
455 | case 'h': | |
456 | usage(argv[0]); | |
457 | exit(0); | |
458 | break; | |
459 | case '?': | |
b6353bea | 460 | errx(EXIT_FAILURE, "Try `%s --help' for more information.", |
7a5ca864 FB |
461 | argv[0]); |
462 | } | |
463 | } | |
464 | ||
465 | if ((argc - optind) != 1) { | |
b6353bea | 466 | errx(EXIT_FAILURE, "Invalid number of argument.\n" |
7a5ca864 FB |
467 | "Try `%s --help' for more information.", |
468 | argv[0]); | |
469 | } | |
470 | ||
cd831bd7 TS |
471 | if (disconnect) { |
472 | fd = open(argv[optind], O_RDWR); | |
fc19f8a0 | 473 | if (fd < 0) { |
cb7cf0e3 | 474 | err(EXIT_FAILURE, "Cannot open %s", argv[optind]); |
fc19f8a0 | 475 | } |
cd831bd7 TS |
476 | nbd_disconnect(fd); |
477 | ||
478 | close(fd); | |
479 | ||
480 | printf("%s disconnected\n", argv[optind]); | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
c1f8fdc3 PB |
485 | if (device && !verbose) { |
486 | int stderr_fd[2]; | |
487 | pid_t pid; | |
488 | int ret; | |
489 | ||
fc19f8a0 | 490 | if (qemu_pipe(stderr_fd) < 0) { |
c1f8fdc3 PB |
491 | err(EXIT_FAILURE, "Error setting up communication pipe"); |
492 | } | |
493 | ||
494 | /* Now daemonize, but keep a communication channel open to | |
495 | * print errors and exit with the proper status code. | |
496 | */ | |
497 | pid = fork(); | |
498 | if (pid == 0) { | |
499 | close(stderr_fd[0]); | |
9faf31b6 | 500 | ret = qemu_daemon(1, 0); |
c1f8fdc3 PB |
501 | |
502 | /* Temporarily redirect stderr to the parent's pipe... */ | |
503 | dup2(stderr_fd[1], STDERR_FILENO); | |
fc19f8a0 | 504 | if (ret < 0) { |
c1f8fdc3 PB |
505 | err(EXIT_FAILURE, "Failed to daemonize"); |
506 | } | |
507 | ||
508 | /* ... close the descriptor we inherited and go on. */ | |
509 | close(stderr_fd[1]); | |
510 | } else { | |
511 | bool errors = false; | |
512 | char *buf; | |
513 | ||
514 | /* In the parent. Print error messages from the child until | |
515 | * it closes the pipe. | |
516 | */ | |
517 | close(stderr_fd[1]); | |
518 | buf = g_malloc(1024); | |
519 | while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { | |
520 | errors = true; | |
521 | ret = qemu_write_full(STDERR_FILENO, buf, ret); | |
fc19f8a0 | 522 | if (ret < 0) { |
c1f8fdc3 PB |
523 | exit(EXIT_FAILURE); |
524 | } | |
525 | } | |
fc19f8a0 | 526 | if (ret < 0) { |
c1f8fdc3 PB |
527 | err(EXIT_FAILURE, "Cannot read from daemon"); |
528 | } | |
529 | ||
530 | /* Usually the daemon should not print any message. | |
531 | * Exit with zero status in that case. | |
532 | */ | |
533 | exit(errors); | |
534 | } | |
535 | } | |
536 | ||
a6ac2313 PB |
537 | if (device != NULL && sockpath == NULL) { |
538 | sockpath = g_malloc(128); | |
539 | snprintf(sockpath, 128, SOCKET_PATH, basename(device)); | |
cd831bd7 TS |
540 | } |
541 | ||
7e7f4a0e | 542 | qemu_init_main_loop(); |
802ddc37 PB |
543 | bdrv_init(); |
544 | atexit(bdrv_close_all); | |
545 | ||
546 | bs = bdrv_new("hda"); | |
547 | srcpath = argv[optind]; | |
548 | if ((ret = bdrv_open(bs, srcpath, flags, NULL)) < 0) { | |
549 | errno = -ret; | |
550 | err(EXIT_FAILURE, "Failed to bdrv_open '%s'", argv[optind]); | |
551 | } | |
552 | ||
38ceff04 | 553 | fd_size = bdrv_getlength(bs); |
802ddc37 | 554 | |
185b4338 PB |
555 | if (partition != -1) { |
556 | ret = find_partition(bs, partition, &dev_offset, &fd_size); | |
557 | if (ret < 0) { | |
558 | errno = -ret; | |
559 | err(EXIT_FAILURE, "Could not find partition %d", partition); | |
560 | } | |
802ddc37 PB |
561 | } |
562 | ||
7860a380 | 563 | exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed); |
3b05a8e9 | 564 | |
b32f6c28 | 565 | if (sockpath) { |
a61c6782 | 566 | fd = unix_socket_incoming(sockpath); |
cd831bd7 | 567 | } else { |
a61c6782 | 568 | fd = tcp_socket_incoming(bindto, port); |
cd831bd7 TS |
569 | } |
570 | ||
fc19f8a0 | 571 | if (fd < 0) { |
7a5ca864 | 572 | return 1; |
a61c6782 | 573 | } |
f1ef5555 PB |
574 | |
575 | if (device) { | |
576 | int ret; | |
577 | ||
a6ac2313 | 578 | ret = pthread_create(&client_thread, NULL, nbd_client_thread, device); |
f1ef5555 PB |
579 | if (ret != 0) { |
580 | errx(EXIT_FAILURE, "Failed to create client thread: %s", | |
581 | strerror(ret)); | |
582 | } | |
583 | } else { | |
584 | /* Shut up GCC warnings. */ | |
585 | memset(&client_thread, 0, sizeof(client_thread)); | |
586 | } | |
587 | ||
a61c6782 PB |
588 | qemu_set_fd_handler2(fd, nbd_can_accept, nbd_accept, NULL, |
589 | (void *)(uintptr_t)fd); | |
7a5ca864 | 590 | |
9faf31b6 MT |
591 | /* now when the initialization is (almost) complete, chdir("/") |
592 | * to free any busy filesystems */ | |
593 | if (chdir("/") < 0) { | |
594 | err(EXIT_FAILURE, "Could not chdir to root directory"); | |
595 | } | |
596 | ||
7860a380 | 597 | state = RUNNING; |
3b05a8e9 | 598 | do { |
a61c6782 | 599 | main_loop_wait(false); |
7860a380 PB |
600 | if (state == TERMINATE) { |
601 | state = TERMINATING; | |
602 | nbd_export_close(exp); | |
603 | nbd_export_put(exp); | |
604 | exp = NULL; | |
605 | } | |
606 | } while (state != TERMINATED); | |
7a5ca864 | 607 | |
a4aab7b4 | 608 | bdrv_close(bs); |
b32f6c28 PB |
609 | if (sockpath) { |
610 | unlink(sockpath); | |
611 | } | |
7a5ca864 | 612 | |
a517e88b PB |
613 | if (device) { |
614 | void *ret; | |
615 | pthread_join(client_thread, &ret); | |
616 | exit(ret != NULL); | |
617 | } else { | |
618 | exit(EXIT_SUCCESS); | |
619 | } | |
7a5ca864 | 620 | } |