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thscd831bd2008-07-03 10:23:51 +00001/*
bellard7a5ca862008-05-27 21:13:40 +00002 * 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
Blue Swirl8167ee82009-07-16 20:47:01 +000016 * along with this program; if not, see <http://www.gnu.org/licenses/>.
bellard7a5ca862008-05-27 21:13:40 +000017 */
18
Peter Maydelld38ea872016-01-29 17:50:05 +000019#include "qemu/osdep.h"
Eric Blakec2a3d7d2017-07-21 08:50:47 -050020#include <getopt.h>
21#include <libgen.h>
22#include <pthread.h>
23
Markus Armbrustera8d25322019-05-23 16:35:08 +020024#include "qemu-common.h"
Markus Armbrusterda34e652016-03-14 09:01:28 +010025#include "qapi/error.h"
Veronia Bahaaf348b6d2016-03-20 19:16:19 +020026#include "qemu/cutils.h"
Markus Armbruster26f54e92014-10-07 13:59:04 +020027#include "sysemu/block-backend.h"
Peter Lievenb3838a42014-08-13 19:20:18 +020028#include "block/block_int.h"
Paolo Bonzini737e1502012-12-17 18:19:44 +010029#include "block/nbd.h"
Alex Bligh6a1751b2013-08-21 16:02:47 +010030#include "qemu/main-loop.h"
Markus Armbruster0b8fa322019-05-23 16:35:07 +020031#include "qemu/module.h"
Markus Armbruster922a01a2018-02-01 12:18:46 +010032#include "qemu/option.h"
Paolo Bonzini537b41f2014-02-17 14:43:51 +010033#include "qemu/error-report.h"
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +000034#include "qemu/config-file.h"
Paolo Bonzini58369e22016-03-15 17:22:36 +010035#include "qemu/bswap.h"
Denis V. Lunev39ca4632016-06-17 17:44:12 +030036#include "qemu/log.h"
Paolo Bonzini53fabd42017-03-16 16:29:45 +010037#include "qemu/systemd.h"
Wenchao Xia8c116b02013-12-04 17:10:55 +080038#include "block/snapshot.h"
Markus Armbruster452fcdb2018-02-01 12:18:39 +010039#include "qapi/qmp/qdict.h"
Markus Armbrusterd49b6832015-03-17 18:29:20 +010040#include "qapi/qmp/qstring.h"
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +000041#include "qom/object_interfaces.h"
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +000042#include "io/channel-socket.h"
Daniel P. Berrangee4849c12017-12-18 10:16:43 +000043#include "io/net-listener.h"
Daniel P. Berrangec2297082016-04-06 12:12:06 +010044#include "crypto/init.h"
Denis V. Lunev39ca4632016-06-17 17:44:12 +030045#include "trace/control.h"
Eric Blakebe377132017-07-21 08:50:46 -050046#include "qemu-version.h"
bellard7a5ca862008-05-27 21:13:40 +000047
Eric Blake3c1fa352018-12-15 07:53:08 -060048#ifdef __linux__
49#define HAVE_NBD_DEVICE 1
50#else
51#define HAVE_NBD_DEVICE 0
52#endif
53
Peter Lieven713cc672014-08-13 19:20:19 +020054#define SOCKET_PATH "/var/lock/qemu-nbd-%s"
Daniel P. Berrangefa8b7ce2016-02-17 10:10:21 +000055#define QEMU_NBD_OPT_CACHE 256
56#define QEMU_NBD_OPT_AIO 257
57#define QEMU_NBD_OPT_DISCARD 258
58#define QEMU_NBD_OPT_DETECT_ZEROES 259
59#define QEMU_NBD_OPT_OBJECT 260
60#define QEMU_NBD_OPT_TLSCREDS 261
61#define QEMU_NBD_OPT_IMAGE_OPTS 262
Max Reitzffb31e12016-09-28 22:46:42 +020062#define QEMU_NBD_OPT_FORK 263
Daniel P. Berrangeb25e12d2019-02-27 16:20:33 +000063#define QEMU_NBD_OPT_TLSAUTHZ 264
Max Reitz637bc5a2019-05-08 23:18:16 +020064#define QEMU_NBD_OPT_PID_FILE 265
bellard7a5ca862008-05-27 21:13:40 +000065
Eric Blakebd31c212016-05-06 10:26:42 -060066#define MBR_SIZE 512
67
Philippe Mathieu-Daudé9d976582019-01-11 17:35:19 +010068static NBDExport *export;
blueswir1b1d8e522008-10-26 13:43:07 +000069static int verbose;
Paolo Bonzinia517e882011-11-04 15:51:21 +010070static char *srcpath;
Markus Armbrusterbd269eb2017-04-26 09:36:41 +020071static SocketAddress *saddr;
Paolo Bonzini7860a382012-09-18 13:31:56 +020072static int persistent = 0;
73static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state;
Paolo Bonzinia61c6782011-09-12 17:28:11 +020074static int shared = 1;
75static int nb_fds;
Daniel P. Berrangee4849c12017-12-18 10:16:43 +000076static QIONetListener *server;
Daniel P. Berrange145614a2016-02-10 18:41:13 +000077static QCryptoTLSCreds *tlscreds;
Daniel P. Berrangeb25e12d2019-02-27 16:20:33 +000078static const char *tlsauthz;
bellard7a5ca862008-05-27 21:13:40 +000079
80static void usage(const char *name)
81{
Paolo Bonzinib033cd82012-07-18 14:50:52 +020082 (printf) (
bellard7a5ca862008-05-27 21:13:40 +000083"Usage: %s [OPTIONS] FILE\n"
Eric Blake68b96f12019-01-17 13:36:56 -060084" or: %s -L [OPTIONS]\n"
85"QEMU Disk Network Block Device Utility\n"
bellard7a5ca862008-05-27 21:13:40 +000086"\n"
Peter Lieven713cc672014-08-13 19:20:19 +020087" -h, --help display this help and exit\n"
88" -V, --version output version information and exit\n"
bellard7a5ca862008-05-27 21:13:40 +000089"\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +020090"Connection properties:\n"
Peter Lieven713cc672014-08-13 19:20:19 +020091" -p, --port=PORT port to listen on (default `%d')\n"
92" -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
93" -k, --socket=PATH path to the unix socket\n"
94" (default '"SOCKET_PATH"')\n"
95" -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
96" -t, --persistent don't exit on the last connection\n"
97" -v, --verbose display extra debugging information\n"
Vladimir Sementsov-Ogievskiyf5cd0bb2018-10-03 20:02:27 +030098" -x, --export-name=NAME expose export by name (default is empty string)\n"
99" -D, --description=TEXT export a human-readable description\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +0200100"\n"
101"Exposing part of the image:\n"
Peter Lieven713cc672014-08-13 19:20:19 +0200102" -o, --offset=OFFSET offset into the image\n"
103" -P, --partition=NUM only expose partition NUM\n"
Eric Blake636192c2019-01-11 13:47:20 -0600104" -B, --bitmap=NAME expose a persistent dirty bitmap\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +0200105"\n"
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +0000106"General purpose options:\n"
Eric Blake68b96f12019-01-17 13:36:56 -0600107" -L, --list list exports available from another NBD server\n"
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +0000108" --object type,id=ID,... define an object such as 'secret' for providing\n"
109" passwords and/or encryption keys\n"
Eric Blakef7812df2018-10-03 13:04:26 -0500110" --tls-creds=ID use id of an earlier --object to provide TLS\n"
Daniel P. Berrangeb25e12d2019-02-27 16:20:33 +0000111" --tls-authz=ID use id of an earlier --object to provide\n"
112" authorization\n"
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300113" -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
114" specify tracing options\n"
Max Reitzffb31e12016-09-28 22:46:42 +0200115" --fork fork off the server process and exit the parent\n"
116" once the server is running\n"
Max Reitz637bc5a2019-05-08 23:18:16 +0200117" --pid-file=PATH store the server's process ID in the given file\n"
Eric Blake3c1fa352018-12-15 07:53:08 -0600118#if HAVE_NBD_DEVICE
119"\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +0200120"Kernel NBD client support:\n"
Peter Lieven713cc672014-08-13 19:20:19 +0200121" -c, --connect=DEV connect FILE to the local NBD device DEV\n"
122" -d, --disconnect disconnect the specified device\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +0200123#endif
124"\n"
125"Block device options:\n"
Peter Lieven713cc672014-08-13 19:20:19 +0200126" -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
127" -r, --read-only export read-only\n"
128" -s, --snapshot use FILE as an external snapshot, create a temporary\n"
129" file with backing_file=FILE, redirect the write to\n"
130" the temporary one\n"
Wenchao Xia8c116b02013-12-04 17:10:55 +0800131" -l, --load-snapshot=SNAPSHOT_PARAM\n"
Peter Lieven713cc672014-08-13 19:20:19 +0200132" load an internal snapshot inside FILE and export it\n"
133" as an read-only device, SNAPSHOT_PARAM format is\n"
134" 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
135" '[ID_OR_NAME]'\n"
136" -n, --nocache disable host cache\n"
137" --cache=MODE set cache mode (none, writeback, ...)\n"
Aarushi Mehta76802742020-01-20 14:18:56 +0000138" --aio=MODE set AIO mode (native, io_uring or threads)\n"
Peter Lievenb3838a42014-08-13 19:20:18 +0200139" --discard=MODE set discard mode (ignore, unmap)\n"
Andrey Korolyov6883de62015-07-31 22:12:54 +0300140" --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000141" --image-opts treat FILE as a full set of image options\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +0200142"\n"
Eric Blakef5048cb2017-08-03 11:33:53 -0500143QEMU_HELP_BOTTOM "\n"
Eric Blake68b96f12019-01-17 13:36:56 -0600144 , name, name, NBD_DEFAULT_PORT, "DEVICE");
bellard7a5ca862008-05-27 21:13:40 +0000145}
146
147static void version(const char *name)
148{
149 printf(
Thomas Huth7e563bf2018-02-15 12:06:47 +0100150"%s " QEMU_FULL_VERSION "\n"
bellard7a5ca862008-05-27 21:13:40 +0000151"Written by Anthony Liguori.\n"
152"\n"
Eric Blakebe377132017-07-21 08:50:46 -0500153QEMU_COPYRIGHT "\n"
bellard7a5ca862008-05-27 21:13:40 +0000154"This is free software; see the source for copying conditions. There is NO\n"
155"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
ths315bc7a2008-07-18 18:06:23 +0000156 , name);
bellard7a5ca862008-05-27 21:13:40 +0000157}
158
159struct partition_record
160{
161 uint8_t bootable;
162 uint8_t start_head;
163 uint32_t start_cylinder;
164 uint8_t start_sector;
165 uint8_t system;
166 uint8_t end_head;
167 uint8_t end_cylinder;
168 uint8_t end_sector;
169 uint32_t start_sector_abs;
170 uint32_t nb_sectors_abs;
171};
172
173static void read_partition(uint8_t *p, struct partition_record *r)
174{
175 r->bootable = p[0];
176 r->start_head = p[1];
177 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300);
178 r->start_sector = p[2] & 0x3f;
179 r->system = p[4];
180 r->end_head = p[5];
181 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300);
182 r->end_sector = p[6] & 0x3f;
Max Reitzac973932015-02-25 13:08:23 -0500183
Peter Maydell773dce32016-06-10 16:00:36 +0100184 r->start_sector_abs = ldl_le_p(p + 8);
185 r->nb_sectors_abs = ldl_le_p(p + 12);
bellard7a5ca862008-05-27 21:13:40 +0000186}
187
Max Reitz4c58e802014-11-18 12:21:19 +0100188static int find_partition(BlockBackend *blk, int partition,
Eric Blake9d26dfc2019-01-17 13:36:43 -0600189 uint64_t *offset, uint64_t *size)
bellard7a5ca862008-05-27 21:13:40 +0000190{
191 struct partition_record mbr[4];
Eric Blakebd31c212016-05-06 10:26:42 -0600192 uint8_t data[MBR_SIZE];
bellard7a5ca862008-05-27 21:13:40 +0000193 int i;
194 int ext_partnum = 4;
Ryota Ozakicb7cf0e2010-05-03 06:50:25 +0900195 int ret;
bellard7a5ca862008-05-27 21:13:40 +0000196
Eric Blakebd31c212016-05-06 10:26:42 -0600197 ret = blk_pread(blk, 0, data, sizeof(data));
198 if (ret < 0) {
Markus Armbrustera4699e52015-12-18 16:35:10 +0100199 error_report("error while reading: %s", strerror(-ret));
Markus Armbruster85b01e02015-12-18 16:35:04 +0100200 exit(EXIT_FAILURE);
Ryota Ozakicb7cf0e2010-05-03 06:50:25 +0900201 }
bellard7a5ca862008-05-27 21:13:40 +0000202
203 if (data[510] != 0x55 || data[511] != 0xaa) {
Paolo Bonzini185b4332012-03-05 08:56:10 +0100204 return -EINVAL;
bellard7a5ca862008-05-27 21:13:40 +0000205 }
206
207 for (i = 0; i < 4; i++) {
208 read_partition(&data[446 + 16 * i], &mbr[i]);
209
Max Reitz453b07b2015-02-25 13:08:15 -0500210 if (!mbr[i].system || !mbr[i].nb_sectors_abs) {
bellard7a5ca862008-05-27 21:13:40 +0000211 continue;
Max Reitz453b07b2015-02-25 13:08:15 -0500212 }
bellard7a5ca862008-05-27 21:13:40 +0000213
214 if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
215 struct partition_record ext[4];
Eric Blakebd31c212016-05-06 10:26:42 -0600216 uint8_t data1[MBR_SIZE];
bellard7a5ca862008-05-27 21:13:40 +0000217 int j;
218
Eric Blakebd31c212016-05-06 10:26:42 -0600219 ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE,
220 data1, sizeof(data1));
221 if (ret < 0) {
Markus Armbrustera4699e52015-12-18 16:35:10 +0100222 error_report("error while reading: %s", strerror(-ret));
Markus Armbruster85b01e02015-12-18 16:35:04 +0100223 exit(EXIT_FAILURE);
Ryota Ozakicb7cf0e2010-05-03 06:50:25 +0900224 }
bellard7a5ca862008-05-27 21:13:40 +0000225
226 for (j = 0; j < 4; j++) {
227 read_partition(&data1[446 + 16 * j], &ext[j]);
Max Reitz453b07b2015-02-25 13:08:15 -0500228 if (!ext[j].system || !ext[j].nb_sectors_abs) {
bellard7a5ca862008-05-27 21:13:40 +0000229 continue;
Max Reitz453b07b2015-02-25 13:08:15 -0500230 }
bellard7a5ca862008-05-27 21:13:40 +0000231
232 if ((ext_partnum + j + 1) == partition) {
233 *offset = (uint64_t)ext[j].start_sector_abs << 9;
234 *size = (uint64_t)ext[j].nb_sectors_abs << 9;
235 return 0;
236 }
237 }
238 ext_partnum += 4;
239 } else if ((i + 1) == partition) {
240 *offset = (uint64_t)mbr[i].start_sector_abs << 9;
241 *size = (uint64_t)mbr[i].nb_sectors_abs << 9;
242 return 0;
243 }
244 }
245
Paolo Bonzini185b4332012-03-05 08:56:10 +0100246 return -ENOENT;
bellard7a5ca862008-05-27 21:13:40 +0000247}
248
Paolo Bonzinibb345112011-11-04 15:51:19 +0100249static void termsig_handler(int signum)
250{
Pavel Butsykin23994a52016-04-14 13:20:15 +0300251 atomic_cmpxchg(&state, RUNNING, TERMINATE);
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200252 qemu_notify_event();
Paolo Bonzinibb345112011-11-04 15:51:19 +0100253}
254
Paolo Bonzini537b41f2014-02-17 14:43:51 +0100255
Eric Blake68b96f12019-01-17 13:36:56 -0600256static int qemu_nbd_client_list(SocketAddress *saddr, QCryptoTLSCreds *tls,
257 const char *hostname)
258{
259 int ret = EXIT_FAILURE;
260 int rc;
261 Error *err = NULL;
262 QIOChannelSocket *sioc;
263 NBDExportInfo *list;
264 int i, j;
265
266 sioc = qio_channel_socket_new();
267 if (qio_channel_socket_connect_sync(sioc, saddr, &err) < 0) {
268 error_report_err(err);
269 return EXIT_FAILURE;
270 }
271 rc = nbd_receive_export_list(QIO_CHANNEL(sioc), tls, hostname, &list,
272 &err);
273 if (rc < 0) {
274 if (err) {
275 error_report_err(err);
276 }
277 goto out;
278 }
279 printf("exports available: %d\n", rc);
280 for (i = 0; i < rc; i++) {
281 printf(" export: '%s'\n", list[i].name);
282 if (list[i].description && *list[i].description) {
283 printf(" description: %s\n", list[i].description);
284 }
285 if (list[i].flags & NBD_FLAG_HAS_FLAGS) {
Max Reitzc4e2aff2019-04-05 21:16:35 +0200286 static const char *const flag_names[] = {
287 [NBD_FLAG_READ_ONLY_BIT] = "readonly",
288 [NBD_FLAG_SEND_FLUSH_BIT] = "flush",
289 [NBD_FLAG_SEND_FUA_BIT] = "fua",
290 [NBD_FLAG_ROTATIONAL_BIT] = "rotational",
291 [NBD_FLAG_SEND_TRIM_BIT] = "trim",
292 [NBD_FLAG_SEND_WRITE_ZEROES_BIT] = "zeroes",
293 [NBD_FLAG_SEND_DF_BIT] = "df",
294 [NBD_FLAG_CAN_MULTI_CONN_BIT] = "multi",
295 [NBD_FLAG_SEND_RESIZE_BIT] = "resize",
296 [NBD_FLAG_SEND_CACHE_BIT] = "cache",
Eric Blake0a479542019-08-23 09:37:23 -0500297 [NBD_FLAG_SEND_FAST_ZERO_BIT] = "fast-zero",
Max Reitzc4e2aff2019-04-05 21:16:35 +0200298 };
299
Eric Blake68b96f12019-01-17 13:36:56 -0600300 printf(" size: %" PRIu64 "\n", list[i].size);
301 printf(" flags: 0x%x (", list[i].flags);
Max Reitzc4e2aff2019-04-05 21:16:35 +0200302 for (size_t bit = 0; bit < ARRAY_SIZE(flag_names); bit++) {
303 if (flag_names[bit] && (list[i].flags & (1 << bit))) {
304 printf(" %s", flag_names[bit]);
305 }
Eric Blake68b96f12019-01-17 13:36:56 -0600306 }
307 printf(" )\n");
308 }
309 if (list[i].min_block) {
310 printf(" min block: %u\n", list[i].min_block);
311 printf(" opt block: %u\n", list[i].opt_block);
312 printf(" max block: %u\n", list[i].max_block);
313 }
314 if (list[i].n_contexts) {
315 printf(" available meta contexts: %d\n", list[i].n_contexts);
316 for (j = 0; j < list[i].n_contexts; j++) {
317 printf(" %s\n", list[i].contexts[j]);
318 }
319 }
320 }
321 nbd_free_export_list(list, rc);
322
323 ret = EXIT_SUCCESS;
324 out:
325 object_unref(OBJECT(sioc));
326 return ret;
327}
328
329
Eric Blake3c1fa352018-12-15 07:53:08 -0600330#if HAVE_NBD_DEVICE
Paolo Bonzinia517e882011-11-04 15:51:21 +0100331static void *show_parts(void *arg)
thscd831bd2008-07-03 10:23:51 +0000332{
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100333 char *device = arg;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100334 int nbd;
thscd831bd2008-07-03 10:23:51 +0000335
Paolo Bonzinia517e882011-11-04 15:51:21 +0100336 /* linux just needs an open() to trigger
337 * the partition table update
338 * but remember to load the module with max_part != 0 :
339 * modprobe nbd max_part=63
340 */
341 nbd = open(device, O_RDWR);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100342 if (nbd >= 0) {
Paolo Bonzinia517e882011-11-04 15:51:21 +0100343 close(nbd);
thscd831bd2008-07-03 10:23:51 +0000344 }
Paolo Bonzinia517e882011-11-04 15:51:21 +0100345 return NULL;
346}
347
348static void *nbd_client_thread(void *arg)
349{
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100350 char *device = arg;
Eric Blake6dc16672019-01-17 13:36:46 -0600351 NBDExportInfo info = { .request_sizes = false, .name = g_strdup("") };
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000352 QIOChannelSocket *sioc;
353 int fd;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100354 int ret;
355 pthread_t show_parts_thread;
Max Reitz1ce52842015-01-26 21:02:59 -0500356 Error *local_error = NULL;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100357
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000358 sioc = qio_channel_socket_new();
359 if (qio_channel_socket_connect_sync(sioc,
360 saddr,
361 &local_error) < 0) {
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100362 error_report_err(local_error);
Stefan Hajnoczidc10e8b2012-01-05 13:16:07 +0000363 goto out;
364 }
Paolo Bonzinia517e882011-11-04 15:51:21 +0100365
Vladimir Sementsov-Ogievskiya8e2bb62019-06-18 14:43:21 +0300366 ret = nbd_receive_negotiate(NULL, QIO_CHANNEL(sioc),
Eric Blake004a89f2017-07-07 15:30:41 -0500367 NULL, NULL, NULL, &info, &local_error);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100368 if (ret < 0) {
Max Reitz1ce52842015-01-26 21:02:59 -0500369 if (local_error) {
Markus Armbruster78288672015-12-18 16:35:07 +0100370 error_report_err(local_error);
Max Reitz1ce52842015-01-26 21:02:59 -0500371 }
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100372 goto out_socket;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100373 }
374
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100375 fd = open(device, O_RDWR);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100376 if (fd < 0) {
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100377 /* Linux-only, we can use %m in printf. */
Markus Armbrusterb9884682015-12-18 16:35:18 +0100378 error_report("Failed to open %s: %m", device);
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100379 goto out_socket;
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100380 }
381
Eric Blake004a89f2017-07-07 15:30:41 -0500382 ret = nbd_init(fd, sioc, &info, &local_error);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100383 if (ret < 0) {
Vladimir Sementsov-Ogievskiybe41c102017-05-26 14:09:13 +0300384 error_report_err(local_error);
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100385 goto out_fd;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100386 }
387
388 /* update partition table */
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100389 pthread_create(&show_parts_thread, NULL, show_parts, device);
Paolo Bonzinia517e882011-11-04 15:51:21 +0100390
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100391 if (verbose) {
392 fprintf(stderr, "NBD device %s is now connected to %s\n",
393 device, srcpath);
394 } else {
395 /* Close stderr so that the qemu-nbd process exits. */
396 dup2(STDOUT_FILENO, STDERR_FILENO);
397 }
Paolo Bonzinia517e882011-11-04 15:51:21 +0100398
399 ret = nbd_client(fd);
400 if (ret) {
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100401 goto out_fd;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100402 }
403 close(fd);
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000404 object_unref(OBJECT(sioc));
Eric Blake6dc16672019-01-17 13:36:46 -0600405 g_free(info.name);
Paolo Bonzinia517e882011-11-04 15:51:21 +0100406 kill(getpid(), SIGTERM);
407 return (void *) EXIT_SUCCESS;
408
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100409out_fd:
410 close(fd);
411out_socket:
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000412 object_unref(OBJECT(sioc));
Paolo Bonzinia517e882011-11-04 15:51:21 +0100413out:
Eric Blake6dc16672019-01-17 13:36:46 -0600414 g_free(info.name);
Paolo Bonzinia517e882011-11-04 15:51:21 +0100415 kill(getpid(), SIGTERM);
416 return (void *) EXIT_FAILURE;
thscd831bd2008-07-03 10:23:51 +0000417}
Eric Blake3c1fa352018-12-15 07:53:08 -0600418#endif /* HAVE_NBD_DEVICE */
thscd831bd2008-07-03 10:23:51 +0000419
Fam Zhenge4afbf42015-05-19 10:50:59 +0000420static int nbd_can_accept(void)
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200421{
Eric Blakedf8ad9f2017-05-26 22:04:21 -0500422 return state == RUNNING && nb_fds < shared;
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200423}
424
Philippe Mathieu-Daudé9d976582019-01-11 17:35:19 +0100425static void nbd_export_closed(NBDExport *export)
Paolo Bonzini7860a382012-09-18 13:31:56 +0200426{
427 assert(state == TERMINATING);
428 state = TERMINATED;
429}
430
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000431static void nbd_update_server_watch(void);
Fam Zhenge4afbf42015-05-19 10:50:59 +0000432
Eric Blake0c9390d2017-06-08 17:26:17 -0500433static void nbd_client_closed(NBDClient *client, bool negotiated)
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200434{
Paolo Bonzini1743b512011-09-19 14:33:23 +0200435 nb_fds--;
Eric Blake0c9390d2017-06-08 17:26:17 -0500436 if (negotiated && nb_fds == 0 && !persistent && state == RUNNING) {
Paolo Bonzini7860a382012-09-18 13:31:56 +0200437 state = TERMINATE;
438 }
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000439 nbd_update_server_watch();
Paolo Bonzini7860a382012-09-18 13:31:56 +0200440 nbd_client_put(client);
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200441}
442
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000443static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc,
444 gpointer opaque)
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200445{
Paolo Bonzini7860a382012-09-18 13:31:56 +0200446 if (state >= TERMINATE) {
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000447 return;
Paolo Bonzini7860a382012-09-18 13:31:56 +0200448 }
449
Fam Zhengee7d7aa2016-01-14 16:41:01 +0800450 nb_fds++;
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000451 nbd_update_server_watch();
Daniel P. Berrangeb25e12d2019-02-27 16:20:33 +0000452 nbd_client_new(cioc, tlscreds, tlsauthz, nbd_client_closed);
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200453}
454
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000455static void nbd_update_server_watch(void)
Fam Zhenge4afbf42015-05-19 10:50:59 +0000456{
457 if (nbd_can_accept()) {
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000458 qio_net_listener_set_client_func(server, nbd_accept, NULL, NULL);
Fam Zhenge4afbf42015-05-19 10:50:59 +0000459 } else {
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000460 qio_net_listener_set_client_func(server, NULL, NULL, NULL);
Fam Zhenge4afbf42015-05-19 10:50:59 +0000461 }
462}
463
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100464
Markus Armbrusterbd269eb2017-04-26 09:36:41 +0200465static SocketAddress *nbd_build_socket_address(const char *sockpath,
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100466 const char *bindto,
467 const char *port)
468{
Markus Armbrusterbd269eb2017-04-26 09:36:41 +0200469 SocketAddress *saddr;
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100470
Markus Armbrusterbd269eb2017-04-26 09:36:41 +0200471 saddr = g_new0(SocketAddress, 1);
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100472 if (sockpath) {
Markus Armbrusterbd269eb2017-04-26 09:36:41 +0200473 saddr->type = SOCKET_ADDRESS_TYPE_UNIX;
474 saddr->u.q_unix.path = g_strdup(sockpath);
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100475 } else {
Eric Blake03992932016-03-03 09:16:48 -0700476 InetSocketAddress *inet;
Markus Armbrusterbd269eb2017-04-26 09:36:41 +0200477 saddr->type = SOCKET_ADDRESS_TYPE_INET;
478 inet = &saddr->u.inet;
Eric Blake03992932016-03-03 09:16:48 -0700479 inet->host = g_strdup(bindto);
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100480 if (port) {
Eric Blake03992932016-03-03 09:16:48 -0700481 inet->port = g_strdup(port);
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100482 } else {
Eric Blake03992932016-03-03 09:16:48 -0700483 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100484 }
485 }
486
487 return saddr;
488}
489
490
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000491static QemuOptsList file_opts = {
492 .name = "file",
493 .implied_opt_name = "file",
494 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
495 .desc = {
496 /* no elements => accept any params */
497 { /* end of list */ }
498 },
499};
500
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +0000501static QemuOptsList qemu_object_opts = {
502 .name = "object",
503 .implied_opt_name = "qom-type",
504 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
505 .desc = {
506 { }
507 },
508};
509
Kevin Wolf495bf892019-10-11 21:49:17 +0200510static bool qemu_nbd_object_print_help(const char *type, QemuOpts *opts)
511{
512 if (user_creatable_print_help(type, opts)) {
513 exit(0);
514 }
515 return true;
516}
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +0000517
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000518
Eric Blake68b96f12019-01-17 13:36:56 -0600519static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, bool list,
520 Error **errp)
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000521{
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
Eric Blake68b96f12019-01-17 13:36:56 -0600540 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 }
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000552 }
553 object_ref(obj);
554 return creds;
555}
556
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000557static 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
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000568/*
569 * Check socket parameters compatibility when socket activation is used.
570 */
571static const char *socket_activation_validate_opts(const char *device,
572 const char *sockpath,
573 const char *address,
Eric Blake68b96f12019-01-17 13:36:56 -0600574 const char *port,
575 bool list)
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000576{
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
Eric Blake68b96f12019-01-17 13:36:56 -0600593 if (list) {
594 return "List mode is incompatible with socket activation";
595 }
596
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000597 return NULL;
598}
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000599
Kevin Wolfb3b52992018-05-16 13:46:37 +0200600static void qemu_nbd_shutdown(void)
601{
602 job_cancel_sync_all();
603 bdrv_close_all();
604}
605
bellard7a5ca862008-05-27 21:13:40 +0000606int main(int argc, char **argv)
607{
Markus Armbruster26f54e92014-10-07 13:59:04 +0200608 BlockBackend *blk;
bellard7a5ca862008-05-27 21:13:40 +0000609 BlockDriverState *bs;
Eric Blake9d26dfc2019-01-17 13:36:43 -0600610 uint64_t dev_offset = 0;
Eric Blakedbb38ca2019-08-23 09:37:22 -0500611 bool readonly = false;
thscd831bd2008-07-03 10:23:51 +0000612 bool disconnect = false;
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000613 const char *bindto = NULL;
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100614 const char *port = NULL;
615 char *sockpath = NULL;
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100616 char *device = NULL;
Eric Blake9d26dfc2019-01-17 13:36:43 -0600617 int64_t fd_size;
Wenchao Xia8c116b02013-12-04 17:10:55 +0800618 QemuOpts *sn_opts = NULL;
619 const char *sn_id_or_name = NULL;
Eric Blake68b96f12019-01-17 13:36:56 -0600620 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:D:B:L";
bellard7a5ca862008-05-27 21:13:40 +0000621 struct option lopt[] = {
Daniel P. Berrangeaa6e5462016-02-17 10:10:22 +0000622 { "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' },
Eric Blake636192c2019-01-11 13:47:20 -0600630 { "bitmap", required_argument, NULL, 'B' },
Daniel P. Berrangeaa6e5462016-02-17 10:10:22 +0000631 { "connect", required_argument, NULL, 'c' },
632 { "disconnect", no_argument, NULL, 'd' },
Eric Blake68b96f12019-01-17 13:36:56 -0600633 { "list", no_argument, NULL, 'L' },
Daniel P. Berrangeaa6e5462016-02-17 10:10:22 +0000634 { "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' },
Eric Blakeb1a75b32016-10-14 13:33:03 -0500648 { "description", required_argument, NULL, 'D' },
Daniel P. Berrangeaa6e5462016-02-17 10:10:22 +0000649 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS },
Daniel P. Berrangeb25e12d2019-02-27 16:20:33 +0000650 { "tls-authz", required_argument, NULL, QEMU_NBD_OPT_TLSAUTHZ },
Daniel P. Berrangeaa6e5462016-02-17 10:10:22 +0000651 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300652 { "trace", required_argument, NULL, 'T' },
Max Reitzffb31e12016-09-28 22:46:42 +0200653 { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK },
Max Reitz637bc5a2019-05-08 23:18:16 +0200654 { "pid-file", required_argument, NULL, QEMU_NBD_OPT_PID_FILE },
Blue Swirl660f11b2009-07-31 21:16:51 +0000655 { NULL, 0, NULL, 0 }
bellard7a5ca862008-05-27 21:13:40 +0000656 };
657 int ch;
658 int opt_ind = 0;
Naphtali Spreif5edb012010-01-17 16:48:13 +0200659 int flags = BDRV_O_RDWR;
Eric Blake43b51012019-01-17 13:36:44 -0600660 int partition = 0;
Max Reitz4fbec262015-02-05 13:58:19 -0500661 int ret = 0;
Paolo Bonzini39a52352012-07-18 14:57:15 +0200662 bool seen_cache = false;
Paolo Bonzinided9d2d2013-02-08 14:06:13 +0100663 bool seen_discard = false;
Paolo Bonzini39a52352012-07-18 14:57:15 +0200664 bool seen_aio = false;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100665 pthread_t client_thread;
Daniel P. Berrangee6b63672013-03-19 11:20:20 +0000666 const char *fmt = NULL;
Max Reitz34b5d2c2013-09-05 14:45:29 +0200667 Error *local_err = NULL;
Peter Lievenb3838a42014-08-13 19:20:18 +0200668 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
Max Reitz4fbec262015-02-05 13:58:19 -0500669 QDict *options = NULL;
Eric Blake68b96f12019-01-17 13:36:56 -0600670 const char *export_name = NULL; /* defaults to "" later for server mode */
Eric Blakeb1a75b32016-10-14 13:33:03 -0500671 const char *export_description = NULL;
Eric Blake636192c2019-01-11 13:47:20 -0600672 const char *bitmap = NULL;
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000673 const char *tlscredsid = NULL;
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000674 bool imageOpts = false;
Kevin Wolf6effd5b2016-03-14 11:43:28 +0100675 bool writethrough = true;
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300676 char *trace_file = NULL;
Max Reitzffb31e12016-09-28 22:46:42 +0200677 bool fork_process = false;
Eric Blake68b96f12019-01-17 13:36:56 -0600678 bool list = false;
Max Reitzffb31e12016-09-28 22:46:42 +0200679 int old_stderr = -1;
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000680 unsigned socket_activation;
Max Reitz637bc5a2019-05-08 23:18:16 +0200681 const char *pid_file_name = NULL;
bellard7a5ca862008-05-27 21:13:40 +0000682
Paolo Bonzinia517e882011-11-04 15:51:21 +0100683 /* The client thread uses SIGTERM to interrupt the server. A signal
684 * handler ensures that "qemu-nbd -v -c" exits with a nice status code.
685 */
Paolo Bonzinibb345112011-11-04 15:51:19 +0100686 struct sigaction sa_sigterm;
Paolo Bonzinibb345112011-11-04 15:51:19 +0100687 memset(&sa_sigterm, 0, sizeof(sa_sigterm));
688 sa_sigterm.sa_handler = termsig_handler;
689 sigaction(SIGTERM, &sa_sigterm, NULL);
Daniel P. Berrangec2297082016-04-06 12:12:06 +0100690
Max Reitz041e32b2017-06-11 14:37:14 +0200691#ifdef CONFIG_POSIX
692 signal(SIGPIPE, SIG_IGN);
693#endif
694
Christophe Fergeauf5852ef2019-01-31 17:46:14 +0100695 error_init(argv[0]);
Daniel P. Berrangefe4db842016-10-04 14:35:52 +0100696 module_call_init(MODULE_INIT_TRACE);
Eduardo Habkoste8f2d272016-05-12 11:10:04 -0300697 qcrypto_init(&error_fatal);
Daniel P. Berrangec2297082016-04-06 12:12:06 +0100698
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +0000699 module_call_init(MODULE_INIT_QOM);
700 qemu_add_opts(&qemu_object_opts);
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300701 qemu_add_opts(&qemu_trace_opts);
Fam Zheng10f5bff2014-02-10 14:48:51 +0800702 qemu_init_exec_dir(argv[0]);
Paolo Bonzinibb345112011-11-04 15:51:19 +0100703
bellard7a5ca862008-05-27 21:13:40 +0000704 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
705 switch (ch) {
706 case 's':
ths2f726482008-07-03 11:47:46 +0000707 flags |= BDRV_O_SNAPSHOT;
708 break;
709 case 'n':
Paolo Bonzini39a52352012-07-18 14:57:15 +0200710 optarg = (char *) "none";
711 /* fallthrough */
712 case QEMU_NBD_OPT_CACHE:
713 if (seen_cache) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100714 error_report("-n and --cache can only be specified once");
715 exit(EXIT_FAILURE);
Paolo Bonzini39a52352012-07-18 14:57:15 +0200716 }
717 seen_cache = true;
Kevin Wolf6effd5b2016-03-14 11:43:28 +0100718 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100719 error_report("Invalid cache mode `%s'", optarg);
720 exit(EXIT_FAILURE);
Paolo Bonzini39a52352012-07-18 14:57:15 +0200721 }
bellard7a5ca862008-05-27 21:13:40 +0000722 break;
Paolo Bonzini39a52352012-07-18 14:57:15 +0200723 case QEMU_NBD_OPT_AIO:
724 if (seen_aio) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100725 error_report("--aio can only be specified once");
726 exit(EXIT_FAILURE);
Paolo Bonzini39a52352012-07-18 14:57:15 +0200727 }
728 seen_aio = true;
Aarushi Mehta76802742020-01-20 14:18:56 +0000729 if (bdrv_parse_aio(optarg, &flags) < 0) {
730 error_report("Invalid aio mode '%s'", optarg);
731 exit(EXIT_FAILURE);
Paolo Bonzini39a52352012-07-18 14:57:15 +0200732 }
733 break;
Paolo Bonzinided9d2d2013-02-08 14:06:13 +0100734 case QEMU_NBD_OPT_DISCARD:
735 if (seen_discard) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100736 error_report("--discard can only be specified once");
737 exit(EXIT_FAILURE);
Paolo Bonzinided9d2d2013-02-08 14:06:13 +0100738 }
739 seen_discard = true;
740 if (bdrv_parse_discard_flags(optarg, &flags) == -1) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100741 error_report("Invalid discard mode `%s'", optarg);
742 exit(EXIT_FAILURE);
Paolo Bonzinided9d2d2013-02-08 14:06:13 +0100743 }
744 break;
Peter Lievenb3838a42014-08-13 19:20:18 +0200745 case QEMU_NBD_OPT_DETECT_ZEROES:
746 detect_zeroes =
Marc-André Lureauf7abe0e2017-08-24 10:46:10 +0200747 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
Peter Lievenb3838a42014-08-13 19:20:18 +0200748 optarg,
Peter Lievenb3838a42014-08-13 19:20:18 +0200749 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
750 &local_err);
751 if (local_err) {
Markus Armbrusterc29b77f2015-12-18 16:35:14 +0100752 error_reportf_err(local_err,
753 "Failed to parse detect_zeroes mode: ");
Markus Armbruster85b01e02015-12-18 16:35:04 +0100754 exit(EXIT_FAILURE);
Peter Lievenb3838a42014-08-13 19:20:18 +0200755 }
756 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
757 !(flags & BDRV_O_UNMAP)) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100758 error_report("setting detect-zeroes to unmap is not allowed "
759 "without setting discard operation to unmap");
760 exit(EXIT_FAILURE);
Peter Lievenb3838a42014-08-13 19:20:18 +0200761 }
762 break;
bellard7a5ca862008-05-27 21:13:40 +0000763 case 'b':
764 bindto = optarg;
765 break;
766 case 'p':
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100767 port = optarg;
bellard7a5ca862008-05-27 21:13:40 +0000768 break;
769 case 'o':
Eric Blake43b51012019-01-17 13:36:44 -0600770 if (qemu_strtou64(optarg, NULL, 0, &dev_offset) < 0) {
771 error_report("Invalid offset '%s'", optarg);
Markus Armbruster85b01e02015-12-18 16:35:04 +0100772 exit(EXIT_FAILURE);
bellard7a5ca862008-05-27 21:13:40 +0000773 }
bellard7a5ca862008-05-27 21:13:40 +0000774 break;
Wenchao Xia8c116b02013-12-04 17:10:55 +0800775 case 'l':
776 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
Markus Armbruster70b94332015-02-13 12:50:26 +0100777 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
778 optarg, false);
Wenchao Xia8c116b02013-12-04 17:10:55 +0800779 if (!sn_opts) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100780 error_report("Failed in parsing snapshot param `%s'",
781 optarg);
782 exit(EXIT_FAILURE);
Wenchao Xia8c116b02013-12-04 17:10:55 +0800783 }
784 } else {
785 sn_id_or_name = optarg;
786 }
787 /* fall through */
bellard7a5ca862008-05-27 21:13:40 +0000788 case 'r':
Eric Blakedbb38ca2019-08-23 09:37:22 -0500789 readonly = true;
Naphtali Sprei07108b22010-03-14 15:19:57 +0200790 flags &= ~BDRV_O_RDWR;
bellard7a5ca862008-05-27 21:13:40 +0000791 break;
792 case 'P':
Eric Blake0ae2d542019-01-25 17:48:37 -0600793 warn_report("The '-P' option is deprecated; use --image-opts with "
794 "a raw device wrapper for subset exports instead");
Eric Blake43b51012019-01-17 13:36:44 -0600795 if (qemu_strtoi(optarg, NULL, 0, &partition) < 0 ||
796 partition < 1 || partition > 8) {
797 error_report("Invalid partition '%s'", optarg);
Markus Armbruster85b01e02015-12-18 16:35:04 +0100798 exit(EXIT_FAILURE);
Peter Lieven713cc672014-08-13 19:20:19 +0200799 }
bellard7a5ca862008-05-27 21:13:40 +0000800 break;
Eric Blake636192c2019-01-11 13:47:20 -0600801 case 'B':
802 bitmap = optarg;
803 break;
thscd831bd2008-07-03 10:23:51 +0000804 case 'k':
Paolo Bonzinib32f6c22011-11-04 15:51:20 +0100805 sockpath = optarg;
Peter Lieven713cc672014-08-13 19:20:19 +0200806 if (sockpath[0] != '/') {
Markus Armbruster9af9e0f2015-12-18 16:35:19 +0100807 error_report("socket path must be absolute");
Markus Armbruster85b01e02015-12-18 16:35:04 +0100808 exit(EXIT_FAILURE);
Peter Lieven713cc672014-08-13 19:20:19 +0200809 }
thscd831bd2008-07-03 10:23:51 +0000810 break;
811 case 'd':
812 disconnect = true;
813 break;
814 case 'c':
815 device = optarg;
816 break;
ths3b05a8e2008-07-03 12:45:02 +0000817 case 'e':
Eric Blake43b51012019-01-17 13:36:44 -0600818 if (qemu_strtoi(optarg, NULL, 0, &shared) < 0 ||
819 shared < 1) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100820 error_report("Invalid shared device number '%s'", optarg);
821 exit(EXIT_FAILURE);
ths3b05a8e2008-07-03 12:45:02 +0000822 }
ths3b05a8e2008-07-03 12:45:02 +0000823 break;
Daniel P. Berrangee6b63672013-03-19 11:20:20 +0000824 case 'f':
825 fmt = optarg;
826 break;
Peter Lieven713cc672014-08-13 19:20:19 +0200827 case 't':
828 persistent = 1;
829 break;
Daniel P. Berrange3d4b2f92016-02-10 18:41:08 +0000830 case 'x':
831 export_name = optarg;
Eric Blake93676c82019-11-13 20:46:34 -0600832 if (strlen(export_name) > NBD_MAX_STRING_SIZE) {
833 error_report("export name '%s' too long", export_name);
834 exit(EXIT_FAILURE);
835 }
Daniel P. Berrange3d4b2f92016-02-10 18:41:08 +0000836 break;
Eric Blakeb1a75b32016-10-14 13:33:03 -0500837 case 'D':
838 export_description = optarg;
Eric Blake93676c82019-11-13 20:46:34 -0600839 if (strlen(export_description) > NBD_MAX_STRING_SIZE) {
840 error_report("export description '%s' too long",
841 export_description);
842 exit(EXIT_FAILURE);
843 }
Eric Blakeb1a75b32016-10-14 13:33:03 -0500844 break;
bellard7a5ca862008-05-27 21:13:40 +0000845 case 'v':
846 verbose = 1;
847 break;
848 case 'V':
849 version(argv[0]);
850 exit(0);
851 break;
852 case 'h':
853 usage(argv[0]);
854 exit(0);
855 break;
856 case '?':
Markus Armbruster85b01e02015-12-18 16:35:04 +0100857 error_report("Try `%s --help' for more information.", argv[0]);
858 exit(EXIT_FAILURE);
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +0000859 case QEMU_NBD_OPT_OBJECT: {
860 QemuOpts *opts;
861 opts = qemu_opts_parse_noisily(&qemu_object_opts,
862 optarg, true);
863 if (!opts) {
864 exit(EXIT_FAILURE);
865 }
866 } break;
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000867 case QEMU_NBD_OPT_TLSCREDS:
868 tlscredsid = optarg;
869 break;
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000870 case QEMU_NBD_OPT_IMAGE_OPTS:
871 imageOpts = true;
872 break;
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300873 case 'T':
874 g_free(trace_file);
875 trace_file = trace_opt_parse(optarg);
876 break;
Daniel P. Berrangeb25e12d2019-02-27 16:20:33 +0000877 case QEMU_NBD_OPT_TLSAUTHZ:
878 tlsauthz = optarg;
879 break;
Max Reitzffb31e12016-09-28 22:46:42 +0200880 case QEMU_NBD_OPT_FORK:
881 fork_process = true;
882 break;
Eric Blake68b96f12019-01-17 13:36:56 -0600883 case 'L':
884 list = true;
885 break;
Max Reitz637bc5a2019-05-08 23:18:16 +0200886 case QEMU_NBD_OPT_PID_FILE:
887 pid_file_name = optarg;
888 break;
bellard7a5ca862008-05-27 21:13:40 +0000889 }
890 }
891
Eric Blake68b96f12019-01-17 13:36:56 -0600892 if (list) {
893 if (argc != optind) {
894 error_report("List mode is incompatible with a file name");
895 exit(EXIT_FAILURE);
896 }
897 if (export_name || export_description || dev_offset || partition ||
898 device || disconnect || fmt || sn_id_or_name || bitmap ||
899 seen_aio || seen_discard || seen_cache) {
900 error_report("List mode is incompatible with per-device settings");
901 exit(EXIT_FAILURE);
902 }
903 if (fork_process) {
904 error_report("List mode is incompatible with forking");
905 exit(EXIT_FAILURE);
906 }
907 } else if ((argc - optind) != 1) {
Markus Armbruster433672b2015-12-18 16:35:24 +0100908 error_report("Invalid number of arguments");
909 error_printf("Try `%s --help' for more information.\n", argv[0]);
Markus Armbruster85b01e02015-12-18 16:35:04 +0100910 exit(EXIT_FAILURE);
Eric Blake68b96f12019-01-17 13:36:56 -0600911 } else if (!export_name) {
912 export_name = "";
bellard7a5ca862008-05-27 21:13:40 +0000913 }
914
Markus Armbruster7e1e0c12018-10-17 10:26:43 +0200915 qemu_opts_foreach(&qemu_object_opts,
916 user_creatable_add_opts_foreach,
Kevin Wolf495bf892019-10-11 21:49:17 +0200917 qemu_nbd_object_print_help, &error_fatal);
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +0000918
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300919 if (!trace_init_backends()) {
920 exit(1);
921 }
922 trace_init_file(trace_file);
923 qemu_set_log(LOG_TRACE);
924
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000925 socket_activation = check_socket_activation();
926 if (socket_activation == 0) {
927 setup_address_and_port(&bindto, &port);
928 } else {
929 /* Using socket activation - check user didn't use -p etc. */
930 const char *err_msg = socket_activation_validate_opts(device, sockpath,
Eric Blake68b96f12019-01-17 13:36:56 -0600931 bindto, port,
932 list);
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000933 if (err_msg != NULL) {
934 error_report("%s", err_msg);
935 exit(EXIT_FAILURE);
936 }
Paolo Bonzini53fabd42017-03-16 16:29:45 +0100937
938 /* qemu-nbd can only listen on a single socket. */
939 if (socket_activation > 1) {
940 error_report("qemu-nbd does not support socket activation with %s > 1",
941 "LISTEN_FDS");
942 exit(EXIT_FAILURE);
943 }
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000944 }
945
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000946 if (tlscredsid) {
947 if (sockpath) {
948 error_report("TLS is only supported with IPv4/IPv6");
949 exit(EXIT_FAILURE);
950 }
951 if (device) {
952 error_report("TLS is not supported with a host device");
953 exit(EXIT_FAILURE);
954 }
Daniel P. Berrangeb25e12d2019-02-27 16:20:33 +0000955 if (tlsauthz && list) {
956 error_report("TLS authorization is incompatible with export list");
957 exit(EXIT_FAILURE);
958 }
Eric Blake68b96f12019-01-17 13:36:56 -0600959 tlscreds = nbd_get_tls_creds(tlscredsid, list, &local_err);
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000960 if (local_err) {
961 error_report("Failed to get TLS creds %s",
962 error_get_pretty(local_err));
963 exit(EXIT_FAILURE);
964 }
Daniel P. Berrangeb25e12d2019-02-27 16:20:33 +0000965 } else {
966 if (tlsauthz) {
967 error_report("--tls-authz is not permitted without --tls-creds");
968 exit(EXIT_FAILURE);
969 }
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000970 }
971
Eric Blake68b96f12019-01-17 13:36:56 -0600972 if (list) {
973 saddr = nbd_build_socket_address(sockpath, bindto, port);
974 return qemu_nbd_client_list(saddr, tlscreds, bindto);
975 }
976
Eric Blake3c1fa352018-12-15 07:53:08 -0600977#if !HAVE_NBD_DEVICE
978 if (disconnect || device) {
979 error_report("Kernel /dev/nbdN support not available");
980 exit(EXIT_FAILURE);
981 }
982#else /* HAVE_NBD_DEVICE */
thscd831bd2008-07-03 10:23:51 +0000983 if (disconnect) {
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000984 int nbdfd = open(argv[optind], O_RDWR);
985 if (nbdfd < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100986 error_report("Cannot open %s: %s", argv[optind],
987 strerror(errno));
988 exit(EXIT_FAILURE);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100989 }
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000990 nbd_disconnect(nbdfd);
thscd831bd2008-07-03 10:23:51 +0000991
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000992 close(nbdfd);
thscd831bd2008-07-03 10:23:51 +0000993
994 printf("%s disconnected\n", argv[optind]);
995
Peter Lieven713cc672014-08-13 19:20:19 +0200996 return 0;
thscd831bd2008-07-03 10:23:51 +0000997 }
Eric Blake3c1fa352018-12-15 07:53:08 -0600998#endif
thscd831bd2008-07-03 10:23:51 +0000999
Max Reitzffb31e12016-09-28 22:46:42 +02001000 if ((device && !verbose) || fork_process) {
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +01001001 int stderr_fd[2];
1002 pid_t pid;
1003 int ret;
1004
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +01001005 if (qemu_pipe(stderr_fd) < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +01001006 error_report("Error setting up communication pipe: %s",
1007 strerror(errno));
1008 exit(EXIT_FAILURE);
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +01001009 }
1010
1011 /* Now daemonize, but keep a communication channel open to
1012 * print errors and exit with the proper status code.
1013 */
1014 pid = fork();
Max Reitz70d47392015-02-25 13:08:22 -05001015 if (pid < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +01001016 error_report("Failed to fork: %s", strerror(errno));
1017 exit(EXIT_FAILURE);
Max Reitz70d47392015-02-25 13:08:22 -05001018 } else if (pid == 0) {
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +01001019 close(stderr_fd[0]);
Max Reitze6df58a2019-05-08 23:18:18 +02001020
1021 old_stderr = dup(STDERR_FILENO);
Michael Tokarev9faf31b2012-01-16 18:37:44 +04001022 ret = qemu_daemon(1, 0);
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +01001023
1024 /* Temporarily redirect stderr to the parent's pipe... */
1025 dup2(stderr_fd[1], STDERR_FILENO);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +01001026 if (ret < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +01001027 error_report("Failed to daemonize: %s", strerror(errno));
1028 exit(EXIT_FAILURE);
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +01001029 }
1030
1031 /* ... close the descriptor we inherited and go on. */
1032 close(stderr_fd[1]);
1033 } else {
1034 bool errors = false;
1035 char *buf;
1036
1037 /* In the parent. Print error messages from the child until
1038 * it closes the pipe.
1039 */
1040 close(stderr_fd[1]);
1041 buf = g_malloc(1024);
1042 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
1043 errors = true;
1044 ret = qemu_write_full(STDERR_FILENO, buf, ret);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +01001045 if (ret < 0) {
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +01001046 exit(EXIT_FAILURE);
1047 }
1048 }
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +01001049 if (ret < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +01001050 error_report("Cannot read from daemon: %s",
1051 strerror(errno));
1052 exit(EXIT_FAILURE);
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +01001053 }
1054
1055 /* Usually the daemon should not print any message.
1056 * Exit with zero status in that case.
1057 */
1058 exit(errors);
1059 }
1060 }
1061
Paolo Bonzinia6ac2312011-12-06 09:07:00 +01001062 if (device != NULL && sockpath == NULL) {
1063 sockpath = g_malloc(128);
1064 snprintf(sockpath, 128, SOCKET_PATH, basename(device));
thscd831bd2008-07-03 10:23:51 +00001065 }
1066
Daniel P. Berrangee4849c12017-12-18 10:16:43 +00001067 server = qio_net_listener_new();
Richard W.M. Jonesa721f532017-02-04 10:03:17 +00001068 if (socket_activation == 0) {
Richard W.M. Jonesa721f532017-02-04 10:03:17 +00001069 saddr = nbd_build_socket_address(sockpath, bindto, port);
Juan Quintelafc8135c2019-08-19 18:08:21 +02001070 if (qio_net_listener_open_sync(server, saddr, 1, &local_err) < 0) {
Daniel P. Berrangee4849c12017-12-18 10:16:43 +00001071 object_unref(OBJECT(server));
Richard W.M. Jonesa721f532017-02-04 10:03:17 +00001072 error_report_err(local_err);
Daniel P. Berrangee4849c12017-12-18 10:16:43 +00001073 exit(EXIT_FAILURE);
Richard W.M. Jonesa721f532017-02-04 10:03:17 +00001074 }
1075 } else {
Daniel P. Berrangee4849c12017-12-18 10:16:43 +00001076 size_t i;
Richard W.M. Jonesa721f532017-02-04 10:03:17 +00001077 /* See comment in check_socket_activation above. */
Daniel P. Berrangee4849c12017-12-18 10:16:43 +00001078 for (i = 0; i < socket_activation; i++) {
1079 QIOChannelSocket *sioc;
1080 sioc = qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD + i,
1081 &local_err);
1082 if (sioc == NULL) {
1083 object_unref(OBJECT(server));
1084 error_report("Failed to use socket activation: %s",
1085 error_get_pretty(local_err));
1086 exit(EXIT_FAILURE);
1087 }
1088 qio_net_listener_add(server, sioc);
1089 object_unref(OBJECT(sioc));
Richard W.M. Jonesa721f532017-02-04 10:03:17 +00001090 }
1091 }
Daniel P. Berrange48bec072015-09-16 14:52:23 +01001092
Chrysostomos Nanakos2f78e492014-09-18 14:30:49 +03001093 if (qemu_init_main_loop(&local_err)) {
Markus Armbruster565f65d2015-02-12 13:55:05 +01001094 error_report_err(local_err);
Chrysostomos Nanakos2f78e492014-09-18 14:30:49 +03001095 exit(EXIT_FAILURE);
1096 }
Paolo Bonzini802ddc32011-11-04 15:51:24 +01001097 bdrv_init();
Kevin Wolfb3b52992018-05-16 13:46:37 +02001098 atexit(qemu_nbd_shutdown);
Paolo Bonzini802ddc32011-11-04 15:51:24 +01001099
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +00001100 srcpath = argv[optind];
1101 if (imageOpts) {
1102 QemuOpts *opts;
1103 if (fmt) {
1104 error_report("--image-opts and -f are mutually exclusive");
1105 exit(EXIT_FAILURE);
1106 }
1107 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
1108 if (!opts) {
1109 qemu_opts_reset(&file_opts);
1110 exit(EXIT_FAILURE);
1111 }
1112 options = qemu_opts_to_qdict(opts, NULL);
1113 qemu_opts_reset(&file_opts);
Max Reitzefaa7c42016-03-16 19:54:38 +01001114 blk = blk_new_open(NULL, NULL, options, flags, &local_err);
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +00001115 } else {
1116 if (fmt) {
1117 options = qdict_new();
Eric Blake46f5ac22017-04-27 16:58:17 -05001118 qdict_put_str(options, "driver", fmt);
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +00001119 }
Max Reitzefaa7c42016-03-16 19:54:38 +01001120 blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
Daniel P. Berrangee6b63672013-03-19 11:20:20 +00001121 }
1122
Max Reitz4fbec262015-02-05 13:58:19 -05001123 if (!blk) {
Markus Armbrusterc29b77f2015-12-18 16:35:14 +01001124 error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
1125 argv[optind]);
Markus Armbruster85b01e02015-12-18 16:35:04 +01001126 exit(EXIT_FAILURE);
Paolo Bonzini802ddc32011-11-04 15:51:24 +01001127 }
Max Reitz4fbec262015-02-05 13:58:19 -05001128 bs = blk_bs(blk);
Paolo Bonzini802ddc32011-11-04 15:51:24 +01001129
Kevin Wolf6effd5b2016-03-14 11:43:28 +01001130 blk_set_enable_write_cache(blk, !writethrough);
1131
Wenchao Xia8c116b02013-12-04 17:10:55 +08001132 if (sn_opts) {
1133 ret = bdrv_snapshot_load_tmp(bs,
1134 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
1135 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
1136 &local_err);
1137 } else if (sn_id_or_name) {
1138 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
1139 &local_err);
1140 }
1141 if (ret < 0) {
Markus Armbrusterc29b77f2015-12-18 16:35:14 +01001142 error_reportf_err(local_err, "Failed to load snapshot: ");
Markus Armbruster85b01e02015-12-18 16:35:04 +01001143 exit(EXIT_FAILURE);
Wenchao Xia8c116b02013-12-04 17:10:55 +08001144 }
1145
Peter Lievenb3838a42014-08-13 19:20:18 +02001146 bs->detect_zeroes = detect_zeroes;
Max Reitz4c58e802014-11-18 12:21:19 +01001147 fd_size = blk_getlength(blk);
Max Reitz98f44bb2015-02-25 13:08:21 -05001148 if (fd_size < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +01001149 error_report("Failed to determine the image length: %s",
1150 strerror(-fd_size));
1151 exit(EXIT_FAILURE);
Max Reitz98f44bb2015-02-25 13:08:21 -05001152 }
Paolo Bonzini802ddc32011-11-04 15:51:24 +01001153
Tomáš Golembiovskýe424b652016-10-05 23:40:20 +02001154 if (dev_offset >= fd_size) {
Eric Blake9d26dfc2019-01-17 13:36:43 -06001155 error_report("Offset (%" PRIu64 ") has to be smaller than the image "
1156 "size (%" PRId64 ")", dev_offset, fd_size);
Tomáš Golembiovskýe424b652016-10-05 23:40:20 +02001157 exit(EXIT_FAILURE);
1158 }
1159 fd_size -= dev_offset;
1160
Eric Blake43b51012019-01-17 13:36:44 -06001161 if (partition) {
Eric Blake9d26dfc2019-01-17 13:36:43 -06001162 uint64_t limit;
Eric Blake44859362019-01-17 13:36:41 -06001163
1164 if (dev_offset) {
1165 error_report("Cannot request partition and offset together");
1166 exit(EXIT_FAILURE);
1167 }
1168 ret = find_partition(blk, partition, &dev_offset, &limit);
Paolo Bonzini185b4332012-03-05 08:56:10 +01001169 if (ret < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +01001170 error_report("Could not find partition %d: %s", partition,
Markus Armbrustera4699e52015-12-18 16:35:10 +01001171 strerror(-ret));
Markus Armbruster85b01e02015-12-18 16:35:04 +01001172 exit(EXIT_FAILURE);
Paolo Bonzini185b4332012-03-05 08:56:10 +01001173 }
Eric Blake44859362019-01-17 13:36:41 -06001174 /*
1175 * MBR partition limits are (32-bit << 9); this assert lets
Eric Blake9d26dfc2019-01-17 13:36:43 -06001176 * the compiler know that we can't overflow 64 bits.
Eric Blake44859362019-01-17 13:36:41 -06001177 */
Eric Blake9d26dfc2019-01-17 13:36:43 -06001178 assert(dev_offset + limit >= dev_offset);
Eric Blake44859362019-01-17 13:36:41 -06001179 if (dev_offset + limit > fd_size) {
Eric Blake9d26dfc2019-01-17 13:36:43 -06001180 error_report("Discovered partition %d at offset %" PRIu64
1181 " size %" PRIu64 ", but size exceeds file length %"
1182 PRId64, partition, dev_offset, limit, fd_size);
Eric Blake44859362019-01-17 13:36:41 -06001183 exit(EXIT_FAILURE);
1184 }
1185 fd_size = limit;
Paolo Bonzini802ddc32011-11-04 15:51:24 +01001186 }
1187
Eric Blake3fa4c762019-01-11 13:47:16 -06001188 export = nbd_export_new(bs, dev_offset, fd_size, export_name,
Eric Blakedbb38ca2019-08-23 09:37:22 -05001189 export_description, bitmap, readonly, shared > 1,
Eric Blake678ba272019-01-11 13:47:19 -06001190 nbd_export_closed, writethrough, NULL,
1191 &error_fatal);
ths3b05a8e2008-07-03 12:45:02 +00001192
Paolo Bonzinif1ef5552011-11-04 15:51:23 +01001193 if (device) {
Eric Blake3c1fa352018-12-15 07:53:08 -06001194#if HAVE_NBD_DEVICE
Paolo Bonzinif1ef5552011-11-04 15:51:23 +01001195 int ret;
1196
Paolo Bonzinia6ac2312011-12-06 09:07:00 +01001197 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
Paolo Bonzinif1ef5552011-11-04 15:51:23 +01001198 if (ret != 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +01001199 error_report("Failed to create client thread: %s", strerror(ret));
1200 exit(EXIT_FAILURE);
Paolo Bonzinif1ef5552011-11-04 15:51:23 +01001201 }
Eric Blake3c1fa352018-12-15 07:53:08 -06001202#endif
Paolo Bonzinif1ef5552011-11-04 15:51:23 +01001203 } else {
1204 /* Shut up GCC warnings. */
1205 memset(&client_thread, 0, sizeof(client_thread));
1206 }
1207
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +00001208 nbd_update_server_watch();
bellard7a5ca862008-05-27 21:13:40 +00001209
Max Reitz637bc5a2019-05-08 23:18:16 +02001210 if (pid_file_name) {
1211 qemu_write_pidfile(pid_file_name, &error_fatal);
1212 }
1213
Michael Tokarev9faf31b2012-01-16 18:37:44 +04001214 /* now when the initialization is (almost) complete, chdir("/")
1215 * to free any busy filesystems */
1216 if (chdir("/") < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +01001217 error_report("Could not chdir to root directory: %s",
1218 strerror(errno));
1219 exit(EXIT_FAILURE);
Michael Tokarev9faf31b2012-01-16 18:37:44 +04001220 }
1221
Max Reitzffb31e12016-09-28 22:46:42 +02001222 if (fork_process) {
1223 dup2(old_stderr, STDERR_FILENO);
1224 close(old_stderr);
1225 }
1226
Paolo Bonzini7860a382012-09-18 13:31:56 +02001227 state = RUNNING;
ths3b05a8e2008-07-03 12:45:02 +00001228 do {
Paolo Bonzinia61c6782011-09-12 17:28:11 +02001229 main_loop_wait(false);
Paolo Bonzini7860a382012-09-18 13:31:56 +02001230 if (state == TERMINATE) {
1231 state = TERMINATING;
Philippe Mathieu-Daudé9d976582019-01-11 17:35:19 +01001232 nbd_export_close(export);
1233 nbd_export_put(export);
1234 export = NULL;
Paolo Bonzini7860a382012-09-18 13:31:56 +02001235 }
1236 } while (state != TERMINATED);
ths3b05a8e2008-07-03 12:45:02 +00001237
Markus Armbruster26f54e92014-10-07 13:59:04 +02001238 blk_unref(blk);
Paolo Bonzinib32f6c22011-11-04 15:51:20 +01001239 if (sockpath) {
1240 unlink(sockpath);
1241 }
bellard7a5ca862008-05-27 21:13:40 +00001242
Markus Armbrusterfbf28a42014-09-29 16:07:55 +02001243 qemu_opts_del(sn_opts);
Wenchao Xia8c116b02013-12-04 17:10:55 +08001244
Paolo Bonzinia517e882011-11-04 15:51:21 +01001245 if (device) {
1246 void *ret;
1247 pthread_join(client_thread, &ret);
1248 exit(ret != NULL);
1249 } else {
1250 exit(EXIT_SUCCESS);
1251 }
bellard7a5ca862008-05-27 21:13:40 +00001252}