1cd831bd7Sths /* 27a5ca864Sbellard * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws> 37a5ca864Sbellard * 47a5ca864Sbellard * Network Block Device 57a5ca864Sbellard * 67a5ca864Sbellard * This program is free software; you can redistribute it and/or modify 77a5ca864Sbellard * it under the terms of the GNU General Public License as published by 87a5ca864Sbellard * the Free Software Foundation; under version 2 of the License. 97a5ca864Sbellard * 107a5ca864Sbellard * This program is distributed in the hope that it will be useful, 117a5ca864Sbellard * but WITHOUT ANY WARRANTY; without even the implied warranty of 127a5ca864Sbellard * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 137a5ca864Sbellard * GNU General Public License for more details. 147a5ca864Sbellard * 157a5ca864Sbellard * You should have received a copy of the GNU General Public License 168167ee88SBlue Swirl * along with this program; if not, see <http://www.gnu.org/licenses/>. 177a5ca864Sbellard */ 187a5ca864Sbellard 19d38ea87aSPeter Maydell #include "qemu/osdep.h" 205a61cb60SStefan Weil #include "qemu-common.h" 2126f54e9aSMarkus Armbruster #include "sysemu/block-backend.h" 22b3838a40SPeter Lieven #include "block/block_int.h" 23737e150eSPaolo Bonzini #include "block/nbd.h" 246a1751b7SAlex Bligh #include "qemu/main-loop.h" 25537b41f5SPaolo Bonzini #include "qemu/error-report.h" 260ab3b337SDaniel P. Berrange #include "qemu/config-file.h" 278c116b0eSWenchao Xia #include "block/snapshot.h" 28b3838a40SPeter Lieven #include "qapi/util.h" 29d49b6836SMarkus Armbruster #include "qapi/qmp/qstring.h" 300ab3b337SDaniel P. Berrange #include "qom/object_interfaces.h" 31*d0d6ff58SDaniel P. Berrange #include "io/channel-socket.h" 327a5ca864Sbellard 337a5ca864Sbellard #include <getopt.h> 34*d0d6ff58SDaniel P. Berrange #include <sys/types.h> 35*d0d6ff58SDaniel P. Berrange #include <signal.h> 362bff4b6fSBlue Swirl #include <libgen.h> 37a517e88bSPaolo Bonzini #include <pthread.h> 38cd831bd7Sths 39cd831bd7Sths #define SOCKET_PATH "/var/lock/qemu-nbd-%s" 4039a5235cSPaolo Bonzini #define QEMU_NBD_OPT_CACHE 1 4139a5235cSPaolo Bonzini #define QEMU_NBD_OPT_AIO 2 42ded9d2d5SPaolo Bonzini #define QEMU_NBD_OPT_DISCARD 3 43b3838a40SPeter Lieven #define QEMU_NBD_OPT_DETECT_ZEROES 4 440ab3b337SDaniel P. Berrange #define QEMU_NBD_OPT_OBJECT 5 457a5ca864Sbellard 46af49bbbeSPaolo Bonzini static NBDExport *exp; 47b1d8e52eSblueswir1 static int verbose; 48a517e88bSPaolo Bonzini static char *srcpath; 4948bec07eSDaniel P. Berrange static SocketAddress *saddr; 507860a380SPaolo Bonzini static int persistent = 0; 517860a380SPaolo Bonzini static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state; 52a61c6782SPaolo Bonzini static int shared = 1; 53a61c6782SPaolo Bonzini static int nb_fds; 54*d0d6ff58SDaniel P. Berrange static QIOChannelSocket *server_ioc; 55*d0d6ff58SDaniel P. Berrange static int server_watch = -1; 567a5ca864Sbellard 577a5ca864Sbellard static void usage(const char *name) 587a5ca864Sbellard { 59b033cd86SPaolo Bonzini (printf) ( 607a5ca864Sbellard "Usage: %s [OPTIONS] FILE\n" 617a5ca864Sbellard "QEMU Disk Network Block Device Server\n" 627a5ca864Sbellard "\n" 637a5ca864Sbellard " -h, --help display this help and exit\n" 647a5ca864Sbellard " -V, --version output version information and exit\n" 657a5ca864Sbellard "\n" 66b033cd86SPaolo Bonzini "Connection properties:\n" 67b033cd86SPaolo Bonzini " -p, --port=PORT port to listen on (default `%d')\n" 68b033cd86SPaolo Bonzini " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" 69b033cd86SPaolo Bonzini " -k, --socket=PATH path to the unix socket\n" 70b033cd86SPaolo Bonzini " (default '"SOCKET_PATH"')\n" 71b033cd86SPaolo Bonzini " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" 72b033cd86SPaolo Bonzini " -t, --persistent don't exit on the last connection\n" 73b033cd86SPaolo Bonzini " -v, --verbose display extra debugging information\n" 74b033cd86SPaolo Bonzini "\n" 75b033cd86SPaolo Bonzini "Exposing part of the image:\n" 76b033cd86SPaolo Bonzini " -o, --offset=OFFSET offset into the image\n" 77b033cd86SPaolo Bonzini " -P, --partition=NUM only expose partition NUM\n" 78b033cd86SPaolo Bonzini "\n" 790ab3b337SDaniel P. Berrange "General purpose options:\n" 800ab3b337SDaniel P. Berrange " --object type,id=ID,... define an object such as 'secret' for providing\n" 810ab3b337SDaniel P. Berrange " passwords and/or encryption keys\n" 82b033cd86SPaolo Bonzini #ifdef __linux__ 83b033cd86SPaolo Bonzini "Kernel NBD client support:\n" 84b033cd86SPaolo Bonzini " -c, --connect=DEV connect FILE to the local NBD device DEV\n" 85b033cd86SPaolo Bonzini " -d, --disconnect disconnect the specified device\n" 86b033cd86SPaolo Bonzini "\n" 87b033cd86SPaolo Bonzini #endif 88b033cd86SPaolo Bonzini "\n" 89b033cd86SPaolo Bonzini "Block device options:\n" 904323fdcfSWenchao Xia " -f, --format=FORMAT set image format (raw, qcow2, ...)\n" 91b033cd86SPaolo Bonzini " -r, --read-only export read-only\n" 928c116b0eSWenchao Xia " -s, --snapshot use FILE as an external snapshot, create a temporary\n" 938c116b0eSWenchao Xia " file with backing_file=FILE, redirect the write to\n" 948c116b0eSWenchao Xia " the temporary one\n" 958c116b0eSWenchao Xia " -l, --load-snapshot=SNAPSHOT_PARAM\n" 968c116b0eSWenchao Xia " load an internal snapshot inside FILE and export it\n" 978c116b0eSWenchao Xia " as an read-only device, SNAPSHOT_PARAM format is\n" 988c116b0eSWenchao Xia " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n" 998c116b0eSWenchao Xia " '[ID_OR_NAME]'\n" 100b033cd86SPaolo Bonzini " -n, --nocache disable host cache\n" 10139a5235cSPaolo Bonzini " --cache=MODE set cache mode (none, writeback, ...)\n" 10239a5235cSPaolo Bonzini " --aio=MODE set AIO mode (native or threads)\n" 103b3838a40SPeter Lieven " --discard=MODE set discard mode (ignore, unmap)\n" 1046883de6cSAndrey Korolyov " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n" 105b033cd86SPaolo Bonzini "\n" 106b033cd86SPaolo Bonzini "Report bugs to <qemu-devel@nongnu.org>\n" 107c2e2872bSLaurent Vivier , name, NBD_DEFAULT_PORT, "DEVICE"); 1087a5ca864Sbellard } 1097a5ca864Sbellard 1107a5ca864Sbellard static void version(const char *name) 1117a5ca864Sbellard { 1127a5ca864Sbellard printf( 113315bc7aaSths "%s version 0.0.1\n" 1147a5ca864Sbellard "Written by Anthony Liguori.\n" 1157a5ca864Sbellard "\n" 1167a5ca864Sbellard "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n" 1177a5ca864Sbellard "This is free software; see the source for copying conditions. There is NO\n" 1187a5ca864Sbellard "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" 119315bc7aaSths , name); 1207a5ca864Sbellard } 1217a5ca864Sbellard 1227a5ca864Sbellard struct partition_record 1237a5ca864Sbellard { 1247a5ca864Sbellard uint8_t bootable; 1257a5ca864Sbellard uint8_t start_head; 1267a5ca864Sbellard uint32_t start_cylinder; 1277a5ca864Sbellard uint8_t start_sector; 1287a5ca864Sbellard uint8_t system; 1297a5ca864Sbellard uint8_t end_head; 1307a5ca864Sbellard uint8_t end_cylinder; 1317a5ca864Sbellard uint8_t end_sector; 1327a5ca864Sbellard uint32_t start_sector_abs; 1337a5ca864Sbellard uint32_t nb_sectors_abs; 1347a5ca864Sbellard }; 1357a5ca864Sbellard 1367a5ca864Sbellard static void read_partition(uint8_t *p, struct partition_record *r) 1377a5ca864Sbellard { 1387a5ca864Sbellard r->bootable = p[0]; 1397a5ca864Sbellard r->start_head = p[1]; 1407a5ca864Sbellard r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); 1417a5ca864Sbellard r->start_sector = p[2] & 0x3f; 1427a5ca864Sbellard r->system = p[4]; 1437a5ca864Sbellard r->end_head = p[5]; 1447a5ca864Sbellard r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); 1457a5ca864Sbellard r->end_sector = p[6] & 0x3f; 146ac97393dSMax Reitz 147ac97393dSMax Reitz r->start_sector_abs = le32_to_cpup((uint32_t *)(p + 8)); 148ac97393dSMax Reitz r->nb_sectors_abs = le32_to_cpup((uint32_t *)(p + 12)); 1497a5ca864Sbellard } 1507a5ca864Sbellard 1514c58e80aSMax Reitz static int find_partition(BlockBackend *blk, int partition, 1527a5ca864Sbellard off_t *offset, off_t *size) 1537a5ca864Sbellard { 1547a5ca864Sbellard struct partition_record mbr[4]; 1557a5ca864Sbellard uint8_t data[512]; 1567a5ca864Sbellard int i; 1577a5ca864Sbellard int ext_partnum = 4; 158cb7cf0e3SRyota Ozaki int ret; 1597a5ca864Sbellard 1604c58e80aSMax Reitz if ((ret = blk_read(blk, 0, data, 1)) < 0) { 161a4699e55SMarkus Armbruster error_report("error while reading: %s", strerror(-ret)); 16285b01e09SMarkus Armbruster exit(EXIT_FAILURE); 163cb7cf0e3SRyota Ozaki } 1647a5ca864Sbellard 1657a5ca864Sbellard if (data[510] != 0x55 || data[511] != 0xaa) { 166185b4338SPaolo Bonzini return -EINVAL; 1677a5ca864Sbellard } 1687a5ca864Sbellard 1697a5ca864Sbellard for (i = 0; i < 4; i++) { 1707a5ca864Sbellard read_partition(&data[446 + 16 * i], &mbr[i]); 1717a5ca864Sbellard 172453b07b1SMax Reitz if (!mbr[i].system || !mbr[i].nb_sectors_abs) { 1737a5ca864Sbellard continue; 174453b07b1SMax Reitz } 1757a5ca864Sbellard 1767a5ca864Sbellard if (mbr[i].system == 0xF || mbr[i].system == 0x5) { 1777a5ca864Sbellard struct partition_record ext[4]; 1787a5ca864Sbellard uint8_t data1[512]; 1797a5ca864Sbellard int j; 1807a5ca864Sbellard 1814c58e80aSMax Reitz if ((ret = blk_read(blk, mbr[i].start_sector_abs, data1, 1)) < 0) { 182a4699e55SMarkus Armbruster error_report("error while reading: %s", strerror(-ret)); 18385b01e09SMarkus Armbruster exit(EXIT_FAILURE); 184cb7cf0e3SRyota Ozaki } 1857a5ca864Sbellard 1867a5ca864Sbellard for (j = 0; j < 4; j++) { 1877a5ca864Sbellard read_partition(&data1[446 + 16 * j], &ext[j]); 188453b07b1SMax Reitz if (!ext[j].system || !ext[j].nb_sectors_abs) { 1897a5ca864Sbellard continue; 190453b07b1SMax Reitz } 1917a5ca864Sbellard 1927a5ca864Sbellard if ((ext_partnum + j + 1) == partition) { 1937a5ca864Sbellard *offset = (uint64_t)ext[j].start_sector_abs << 9; 1947a5ca864Sbellard *size = (uint64_t)ext[j].nb_sectors_abs << 9; 1957a5ca864Sbellard return 0; 1967a5ca864Sbellard } 1977a5ca864Sbellard } 1987a5ca864Sbellard ext_partnum += 4; 1997a5ca864Sbellard } else if ((i + 1) == partition) { 2007a5ca864Sbellard *offset = (uint64_t)mbr[i].start_sector_abs << 9; 2017a5ca864Sbellard *size = (uint64_t)mbr[i].nb_sectors_abs << 9; 2027a5ca864Sbellard return 0; 2037a5ca864Sbellard } 2047a5ca864Sbellard } 2057a5ca864Sbellard 206185b4338SPaolo Bonzini return -ENOENT; 2077a5ca864Sbellard } 2087a5ca864Sbellard 209bb345110SPaolo Bonzini static void termsig_handler(int signum) 210bb345110SPaolo Bonzini { 2117860a380SPaolo Bonzini state = TERMINATE; 212a61c6782SPaolo Bonzini qemu_notify_event(); 213bb345110SPaolo Bonzini } 214bb345110SPaolo Bonzini 215537b41f5SPaolo Bonzini 216a517e88bSPaolo Bonzini static void *show_parts(void *arg) 217cd831bd7Sths { 218a6ac2313SPaolo Bonzini char *device = arg; 219cd831bd7Sths int nbd; 220cd831bd7Sths 221cd831bd7Sths /* linux just needs an open() to trigger 222cd831bd7Sths * the partition table update 223cd831bd7Sths * but remember to load the module with max_part != 0 : 224cd831bd7Sths * modprobe nbd max_part=63 225cd831bd7Sths */ 226cd831bd7Sths nbd = open(device, O_RDWR); 227fc19f8a0SPaolo Bonzini if (nbd >= 0) { 228cd831bd7Sths close(nbd); 229cd831bd7Sths } 230a517e88bSPaolo Bonzini return NULL; 231a517e88bSPaolo Bonzini } 232a517e88bSPaolo Bonzini 233a517e88bSPaolo Bonzini static void *nbd_client_thread(void *arg) 234a517e88bSPaolo Bonzini { 235a6ac2313SPaolo Bonzini char *device = arg; 236a517e88bSPaolo Bonzini off_t size; 237a517e88bSPaolo Bonzini uint32_t nbdflags; 238*d0d6ff58SDaniel P. Berrange QIOChannelSocket *sioc; 239*d0d6ff58SDaniel P. Berrange int fd; 240a517e88bSPaolo Bonzini int ret; 241a517e88bSPaolo Bonzini pthread_t show_parts_thread; 2421ce52846SMax Reitz Error *local_error = NULL; 243a517e88bSPaolo Bonzini 244*d0d6ff58SDaniel P. Berrange sioc = qio_channel_socket_new(); 245*d0d6ff58SDaniel P. Berrange if (qio_channel_socket_connect_sync(sioc, 246*d0d6ff58SDaniel P. Berrange saddr, 247*d0d6ff58SDaniel P. Berrange &local_error) < 0) { 24848bec07eSDaniel P. Berrange error_report_err(local_error); 249a517e88bSPaolo Bonzini goto out; 250a517e88bSPaolo Bonzini } 251a517e88bSPaolo Bonzini 252*d0d6ff58SDaniel P. Berrange ret = nbd_receive_negotiate(sioc->fd, NULL, &nbdflags, 2533f472659SMax Reitz &size, &local_error); 254fc19f8a0SPaolo Bonzini if (ret < 0) { 2551ce52846SMax Reitz if (local_error) { 25678288671SMarkus Armbruster error_report_err(local_error); 2571ce52846SMax Reitz } 2580c544d73SPaolo Bonzini goto out_socket; 259a517e88bSPaolo Bonzini } 260a517e88bSPaolo Bonzini 261a6ac2313SPaolo Bonzini fd = open(device, O_RDWR); 262fc19f8a0SPaolo Bonzini if (fd < 0) { 263a6ac2313SPaolo Bonzini /* Linux-only, we can use %m in printf. */ 264b9884681SMarkus Armbruster error_report("Failed to open %s: %m", device); 2650c544d73SPaolo Bonzini goto out_socket; 266a6ac2313SPaolo Bonzini } 267a6ac2313SPaolo Bonzini 268*d0d6ff58SDaniel P. Berrange ret = nbd_init(fd, sioc->fd, nbdflags, size); 269fc19f8a0SPaolo Bonzini if (ret < 0) { 2700c544d73SPaolo Bonzini goto out_fd; 271a517e88bSPaolo Bonzini } 272a517e88bSPaolo Bonzini 273a517e88bSPaolo Bonzini /* update partition table */ 274a6ac2313SPaolo Bonzini pthread_create(&show_parts_thread, NULL, show_parts, device); 275a517e88bSPaolo Bonzini 276c1f8fdc3SPaolo Bonzini if (verbose) { 277a517e88bSPaolo Bonzini fprintf(stderr, "NBD device %s is now connected to %s\n", 278a517e88bSPaolo Bonzini device, srcpath); 279c1f8fdc3SPaolo Bonzini } else { 280c1f8fdc3SPaolo Bonzini /* Close stderr so that the qemu-nbd process exits. */ 281c1f8fdc3SPaolo Bonzini dup2(STDOUT_FILENO, STDERR_FILENO); 282c1f8fdc3SPaolo Bonzini } 283a517e88bSPaolo Bonzini 284a517e88bSPaolo Bonzini ret = nbd_client(fd); 285a517e88bSPaolo Bonzini if (ret) { 2860c544d73SPaolo Bonzini goto out_fd; 287a517e88bSPaolo Bonzini } 288a517e88bSPaolo Bonzini close(fd); 289*d0d6ff58SDaniel P. Berrange object_unref(OBJECT(sioc)); 290a517e88bSPaolo Bonzini kill(getpid(), SIGTERM); 291a517e88bSPaolo Bonzini return (void *) EXIT_SUCCESS; 292a517e88bSPaolo Bonzini 2930c544d73SPaolo Bonzini out_fd: 2940c544d73SPaolo Bonzini close(fd); 2950c544d73SPaolo Bonzini out_socket: 296*d0d6ff58SDaniel P. Berrange object_unref(OBJECT(sioc)); 297a517e88bSPaolo Bonzini out: 298a517e88bSPaolo Bonzini kill(getpid(), SIGTERM); 299a517e88bSPaolo Bonzini return (void *) EXIT_FAILURE; 300cd831bd7Sths } 301cd831bd7Sths 302e4afbf4fSFam Zheng static int nbd_can_accept(void) 303a61c6782SPaolo Bonzini { 304a61c6782SPaolo Bonzini return nb_fds < shared; 305a61c6782SPaolo Bonzini } 306a61c6782SPaolo Bonzini 3077860a380SPaolo Bonzini static void nbd_export_closed(NBDExport *exp) 3087860a380SPaolo Bonzini { 3097860a380SPaolo Bonzini assert(state == TERMINATING); 3107860a380SPaolo Bonzini state = TERMINATED; 3117860a380SPaolo Bonzini } 3127860a380SPaolo Bonzini 313*d0d6ff58SDaniel P. Berrange static void nbd_update_server_watch(void); 314e4afbf4fSFam Zheng 3151743b515SPaolo Bonzini static void nbd_client_closed(NBDClient *client) 316a61c6782SPaolo Bonzini { 317a61c6782SPaolo Bonzini nb_fds--; 3187860a380SPaolo Bonzini if (nb_fds == 0 && !persistent && state == RUNNING) { 3197860a380SPaolo Bonzini state = TERMINATE; 3207860a380SPaolo Bonzini } 321*d0d6ff58SDaniel P. Berrange nbd_update_server_watch(); 3227860a380SPaolo Bonzini nbd_client_put(client); 323a61c6782SPaolo Bonzini } 324a61c6782SPaolo Bonzini 325*d0d6ff58SDaniel P. Berrange static gboolean nbd_accept(QIOChannel *ioc, GIOCondition cond, gpointer opaque) 326a61c6782SPaolo Bonzini { 327*d0d6ff58SDaniel P. Berrange QIOChannelSocket *cioc; 328*d0d6ff58SDaniel P. Berrange int fd; 329a61c6782SPaolo Bonzini 330*d0d6ff58SDaniel P. Berrange cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc), 331*d0d6ff58SDaniel P. Berrange NULL); 332*d0d6ff58SDaniel P. Berrange if (!cioc) { 333*d0d6ff58SDaniel P. Berrange return TRUE; 3340c544d73SPaolo Bonzini } 3350c544d73SPaolo Bonzini 3367860a380SPaolo Bonzini if (state >= TERMINATE) { 337*d0d6ff58SDaniel P. Berrange object_unref(OBJECT(cioc)); 338*d0d6ff58SDaniel P. Berrange return TRUE; 3397860a380SPaolo Bonzini } 3407860a380SPaolo Bonzini 341a61c6782SPaolo Bonzini nb_fds++; 342*d0d6ff58SDaniel P. Berrange nbd_update_server_watch(); 343*d0d6ff58SDaniel P. Berrange fd = dup(cioc->fd); 344*d0d6ff58SDaniel P. Berrange if (fd >= 0) { 345ee7d7aabSFam Zheng nbd_client_new(exp, fd, nbd_client_closed); 346a61c6782SPaolo Bonzini } 347*d0d6ff58SDaniel P. Berrange object_unref(OBJECT(cioc)); 348a61c6782SPaolo Bonzini 349*d0d6ff58SDaniel P. Berrange return TRUE; 350*d0d6ff58SDaniel P. Berrange } 351*d0d6ff58SDaniel P. Berrange 352*d0d6ff58SDaniel P. Berrange static void nbd_update_server_watch(void) 353e4afbf4fSFam Zheng { 354e4afbf4fSFam Zheng if (nbd_can_accept()) { 355*d0d6ff58SDaniel P. Berrange if (server_watch == -1) { 356*d0d6ff58SDaniel P. Berrange server_watch = qio_channel_add_watch(QIO_CHANNEL(server_ioc), 357*d0d6ff58SDaniel P. Berrange G_IO_IN, 358*d0d6ff58SDaniel P. Berrange nbd_accept, 359*d0d6ff58SDaniel P. Berrange NULL, NULL); 360*d0d6ff58SDaniel P. Berrange } 361e4afbf4fSFam Zheng } else { 362*d0d6ff58SDaniel P. Berrange if (server_watch != -1) { 363*d0d6ff58SDaniel P. Berrange g_source_remove(server_watch); 364*d0d6ff58SDaniel P. Berrange server_watch = -1; 365*d0d6ff58SDaniel P. Berrange } 366e4afbf4fSFam Zheng } 367e4afbf4fSFam Zheng } 368e4afbf4fSFam Zheng 36948bec07eSDaniel P. Berrange 37048bec07eSDaniel P. Berrange static SocketAddress *nbd_build_socket_address(const char *sockpath, 37148bec07eSDaniel P. Berrange const char *bindto, 37248bec07eSDaniel P. Berrange const char *port) 37348bec07eSDaniel P. Berrange { 37448bec07eSDaniel P. Berrange SocketAddress *saddr; 37548bec07eSDaniel P. Berrange 37648bec07eSDaniel P. Berrange saddr = g_new0(SocketAddress, 1); 37748bec07eSDaniel P. Berrange if (sockpath) { 3782d32addaSEric Blake saddr->type = SOCKET_ADDRESS_KIND_UNIX; 3792d32addaSEric Blake saddr->u.q_unix = g_new0(UnixSocketAddress, 1); 3802d32addaSEric Blake saddr->u.q_unix->path = g_strdup(sockpath); 38148bec07eSDaniel P. Berrange } else { 3822d32addaSEric Blake saddr->type = SOCKET_ADDRESS_KIND_INET; 3832d32addaSEric Blake saddr->u.inet = g_new0(InetSocketAddress, 1); 3842d32addaSEric Blake saddr->u.inet->host = g_strdup(bindto); 38548bec07eSDaniel P. Berrange if (port) { 3862d32addaSEric Blake saddr->u.inet->port = g_strdup(port); 38748bec07eSDaniel P. Berrange } else { 3882d32addaSEric Blake saddr->u.inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT); 38948bec07eSDaniel P. Berrange } 39048bec07eSDaniel P. Berrange } 39148bec07eSDaniel P. Berrange 39248bec07eSDaniel P. Berrange return saddr; 39348bec07eSDaniel P. Berrange } 39448bec07eSDaniel P. Berrange 39548bec07eSDaniel P. Berrange 3960ab3b337SDaniel P. Berrange static QemuOptsList qemu_object_opts = { 3970ab3b337SDaniel P. Berrange .name = "object", 3980ab3b337SDaniel P. Berrange .implied_opt_name = "qom-type", 3990ab3b337SDaniel P. Berrange .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head), 4000ab3b337SDaniel P. Berrange .desc = { 4010ab3b337SDaniel P. Berrange { } 4020ab3b337SDaniel P. Berrange }, 4030ab3b337SDaniel P. Berrange }; 4040ab3b337SDaniel P. Berrange 4050ab3b337SDaniel P. Berrange 4067a5ca864Sbellard int main(int argc, char **argv) 4077a5ca864Sbellard { 40826f54e9aSMarkus Armbruster BlockBackend *blk; 4097a5ca864Sbellard BlockDriverState *bs; 4107a5ca864Sbellard off_t dev_offset = 0; 411b90fb4b8SPaolo Bonzini uint32_t nbdflags = 0; 412cd831bd7Sths bool disconnect = false; 4137a5ca864Sbellard const char *bindto = "0.0.0.0"; 41448bec07eSDaniel P. Berrange const char *port = NULL; 41548bec07eSDaniel P. Berrange char *sockpath = NULL; 416a6ac2313SPaolo Bonzini char *device = NULL; 4177a5ca864Sbellard off_t fd_size; 4188c116b0eSWenchao Xia QemuOpts *sn_opts = NULL; 4198c116b0eSWenchao Xia const char *sn_id_or_name = NULL; 4208c116b0eSWenchao Xia const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:"; 4217a5ca864Sbellard struct option lopt[] = { 422660f11beSBlue Swirl { "help", 0, NULL, 'h' }, 423660f11beSBlue Swirl { "version", 0, NULL, 'V' }, 424660f11beSBlue Swirl { "bind", 1, NULL, 'b' }, 425660f11beSBlue Swirl { "port", 1, NULL, 'p' }, 426660f11beSBlue Swirl { "socket", 1, NULL, 'k' }, 427660f11beSBlue Swirl { "offset", 1, NULL, 'o' }, 428660f11beSBlue Swirl { "read-only", 0, NULL, 'r' }, 429660f11beSBlue Swirl { "partition", 1, NULL, 'P' }, 430660f11beSBlue Swirl { "connect", 1, NULL, 'c' }, 431660f11beSBlue Swirl { "disconnect", 0, NULL, 'd' }, 432660f11beSBlue Swirl { "snapshot", 0, NULL, 's' }, 4338c116b0eSWenchao Xia { "load-snapshot", 1, NULL, 'l' }, 434660f11beSBlue Swirl { "nocache", 0, NULL, 'n' }, 43539a5235cSPaolo Bonzini { "cache", 1, NULL, QEMU_NBD_OPT_CACHE }, 43639a5235cSPaolo Bonzini { "aio", 1, NULL, QEMU_NBD_OPT_AIO }, 437ded9d2d5SPaolo Bonzini { "discard", 1, NULL, QEMU_NBD_OPT_DISCARD }, 438b3838a40SPeter Lieven { "detect-zeroes", 1, NULL, QEMU_NBD_OPT_DETECT_ZEROES }, 439660f11beSBlue Swirl { "shared", 1, NULL, 'e' }, 440e6b63677SDaniel P. Berrange { "format", 1, NULL, 'f' }, 441660f11beSBlue Swirl { "persistent", 0, NULL, 't' }, 442660f11beSBlue Swirl { "verbose", 0, NULL, 'v' }, 4430ab3b337SDaniel P. Berrange { "object", 1, NULL, QEMU_NBD_OPT_OBJECT }, 444660f11beSBlue Swirl { NULL, 0, NULL, 0 } 4457a5ca864Sbellard }; 4467a5ca864Sbellard int ch; 4477a5ca864Sbellard int opt_ind = 0; 4487a5ca864Sbellard char *end; 449f5edb014SNaphtali Sprei int flags = BDRV_O_RDWR; 4507a5ca864Sbellard int partition = -1; 4514fbec260SMax Reitz int ret = 0; 45239a5235cSPaolo Bonzini bool seen_cache = false; 453ded9d2d5SPaolo Bonzini bool seen_discard = false; 45439a5235cSPaolo Bonzini bool seen_aio = false; 455a517e88bSPaolo Bonzini pthread_t client_thread; 456e6b63677SDaniel P. Berrange const char *fmt = NULL; 45734b5d2c6SMax Reitz Error *local_err = NULL; 458b3838a40SPeter Lieven BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 4594fbec260SMax Reitz QDict *options = NULL; 4607a5ca864Sbellard 461a517e88bSPaolo Bonzini /* The client thread uses SIGTERM to interrupt the server. A signal 462a517e88bSPaolo Bonzini * handler ensures that "qemu-nbd -v -c" exits with a nice status code. 463a517e88bSPaolo Bonzini */ 464bb345110SPaolo Bonzini struct sigaction sa_sigterm; 465bb345110SPaolo Bonzini memset(&sa_sigterm, 0, sizeof(sa_sigterm)); 466bb345110SPaolo Bonzini sa_sigterm.sa_handler = termsig_handler; 467bb345110SPaolo Bonzini sigaction(SIGTERM, &sa_sigterm, NULL); 4680ab3b337SDaniel P. Berrange module_call_init(MODULE_INIT_QOM); 4690ab3b337SDaniel P. Berrange qemu_add_opts(&qemu_object_opts); 47010f5bff6SFam Zheng qemu_init_exec_dir(argv[0]); 471bb345110SPaolo Bonzini 4727a5ca864Sbellard while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { 4737a5ca864Sbellard switch (ch) { 4747a5ca864Sbellard case 's': 4752f726488Sths flags |= BDRV_O_SNAPSHOT; 4762f726488Sths break; 4772f726488Sths case 'n': 47839a5235cSPaolo Bonzini optarg = (char *) "none"; 47939a5235cSPaolo Bonzini /* fallthrough */ 48039a5235cSPaolo Bonzini case QEMU_NBD_OPT_CACHE: 48139a5235cSPaolo Bonzini if (seen_cache) { 48285b01e09SMarkus Armbruster error_report("-n and --cache can only be specified once"); 48385b01e09SMarkus Armbruster exit(EXIT_FAILURE); 48439a5235cSPaolo Bonzini } 48539a5235cSPaolo Bonzini seen_cache = true; 48639a5235cSPaolo Bonzini if (bdrv_parse_cache_flags(optarg, &flags) == -1) { 48785b01e09SMarkus Armbruster error_report("Invalid cache mode `%s'", optarg); 48885b01e09SMarkus Armbruster exit(EXIT_FAILURE); 48939a5235cSPaolo Bonzini } 4907a5ca864Sbellard break; 49139a5235cSPaolo Bonzini case QEMU_NBD_OPT_AIO: 49239a5235cSPaolo Bonzini if (seen_aio) { 49385b01e09SMarkus Armbruster error_report("--aio can only be specified once"); 49485b01e09SMarkus Armbruster exit(EXIT_FAILURE); 49539a5235cSPaolo Bonzini } 49639a5235cSPaolo Bonzini seen_aio = true; 49739a5235cSPaolo Bonzini if (!strcmp(optarg, "native")) { 49839a5235cSPaolo Bonzini flags |= BDRV_O_NATIVE_AIO; 49939a5235cSPaolo Bonzini } else if (!strcmp(optarg, "threads")) { 50039a5235cSPaolo Bonzini /* this is the default */ 50139a5235cSPaolo Bonzini } else { 50285b01e09SMarkus Armbruster error_report("invalid aio mode `%s'", optarg); 50385b01e09SMarkus Armbruster exit(EXIT_FAILURE); 50439a5235cSPaolo Bonzini } 50539a5235cSPaolo Bonzini break; 506ded9d2d5SPaolo Bonzini case QEMU_NBD_OPT_DISCARD: 507ded9d2d5SPaolo Bonzini if (seen_discard) { 50885b01e09SMarkus Armbruster error_report("--discard can only be specified once"); 50985b01e09SMarkus Armbruster exit(EXIT_FAILURE); 510ded9d2d5SPaolo Bonzini } 511ded9d2d5SPaolo Bonzini seen_discard = true; 512ded9d2d5SPaolo Bonzini if (bdrv_parse_discard_flags(optarg, &flags) == -1) { 51385b01e09SMarkus Armbruster error_report("Invalid discard mode `%s'", optarg); 51485b01e09SMarkus Armbruster exit(EXIT_FAILURE); 515ded9d2d5SPaolo Bonzini } 516ded9d2d5SPaolo Bonzini break; 517b3838a40SPeter Lieven case QEMU_NBD_OPT_DETECT_ZEROES: 518b3838a40SPeter Lieven detect_zeroes = 519b3838a40SPeter Lieven qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, 520b3838a40SPeter Lieven optarg, 5217fb1cf16SEric Blake BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX, 522b3838a40SPeter Lieven BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 523b3838a40SPeter Lieven &local_err); 524b3838a40SPeter Lieven if (local_err) { 525c29b77f9SMarkus Armbruster error_reportf_err(local_err, 526c29b77f9SMarkus Armbruster "Failed to parse detect_zeroes mode: "); 52785b01e09SMarkus Armbruster exit(EXIT_FAILURE); 528b3838a40SPeter Lieven } 529b3838a40SPeter Lieven if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 530b3838a40SPeter Lieven !(flags & BDRV_O_UNMAP)) { 53185b01e09SMarkus Armbruster error_report("setting detect-zeroes to unmap is not allowed " 532b3838a40SPeter Lieven "without setting discard operation to unmap"); 53385b01e09SMarkus Armbruster exit(EXIT_FAILURE); 534b3838a40SPeter Lieven } 535b3838a40SPeter Lieven break; 5367a5ca864Sbellard case 'b': 5377a5ca864Sbellard bindto = optarg; 5387a5ca864Sbellard break; 5397a5ca864Sbellard case 'p': 54048bec07eSDaniel P. Berrange port = optarg; 5417a5ca864Sbellard break; 5427a5ca864Sbellard case 'o': 5437a5ca864Sbellard dev_offset = strtoll (optarg, &end, 0); 5447a5ca864Sbellard if (*end) { 54585b01e09SMarkus Armbruster error_report("Invalid offset `%s'", optarg); 54685b01e09SMarkus Armbruster exit(EXIT_FAILURE); 5477a5ca864Sbellard } 5487a5ca864Sbellard if (dev_offset < 0) { 54985b01e09SMarkus Armbruster error_report("Offset must be positive `%s'", optarg); 55085b01e09SMarkus Armbruster exit(EXIT_FAILURE); 5517a5ca864Sbellard } 5527a5ca864Sbellard break; 5538c116b0eSWenchao Xia case 'l': 5548c116b0eSWenchao Xia if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) { 55570b94331SMarkus Armbruster sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts, 55670b94331SMarkus Armbruster optarg, false); 5578c116b0eSWenchao Xia if (!sn_opts) { 55885b01e09SMarkus Armbruster error_report("Failed in parsing snapshot param `%s'", 5598c116b0eSWenchao Xia optarg); 56085b01e09SMarkus Armbruster exit(EXIT_FAILURE); 5618c116b0eSWenchao Xia } 5628c116b0eSWenchao Xia } else { 5638c116b0eSWenchao Xia sn_id_or_name = optarg; 5648c116b0eSWenchao Xia } 5658c116b0eSWenchao Xia /* fall through */ 5667a5ca864Sbellard case 'r': 567b90fb4b8SPaolo Bonzini nbdflags |= NBD_FLAG_READ_ONLY; 56807108b29SNaphtali Sprei flags &= ~BDRV_O_RDWR; 5697a5ca864Sbellard break; 5707a5ca864Sbellard case 'P': 5717a5ca864Sbellard partition = strtol(optarg, &end, 0); 572713cc671SPeter Lieven if (*end) { 57385b01e09SMarkus Armbruster error_report("Invalid partition `%s'", optarg); 57485b01e09SMarkus Armbruster exit(EXIT_FAILURE); 575713cc671SPeter Lieven } 576713cc671SPeter Lieven if (partition < 1 || partition > 8) { 57785b01e09SMarkus Armbruster error_report("Invalid partition %d", partition); 57885b01e09SMarkus Armbruster exit(EXIT_FAILURE); 579713cc671SPeter Lieven } 5807a5ca864Sbellard break; 581cd831bd7Sths case 'k': 582b32f6c28SPaolo Bonzini sockpath = optarg; 583713cc671SPeter Lieven if (sockpath[0] != '/') { 5849af9e0feSMarkus Armbruster error_report("socket path must be absolute"); 58585b01e09SMarkus Armbruster exit(EXIT_FAILURE); 586713cc671SPeter Lieven } 587cd831bd7Sths break; 588cd831bd7Sths case 'd': 589cd831bd7Sths disconnect = true; 590cd831bd7Sths break; 591cd831bd7Sths case 'c': 592cd831bd7Sths device = optarg; 593cd831bd7Sths break; 5943b05a8e9Sths case 'e': 5953b05a8e9Sths shared = strtol(optarg, &end, 0); 5963b05a8e9Sths if (*end) { 59785b01e09SMarkus Armbruster error_report("Invalid shared device number '%s'", optarg); 59885b01e09SMarkus Armbruster exit(EXIT_FAILURE); 5993b05a8e9Sths } 6003b05a8e9Sths if (shared < 1) { 6019af9e0feSMarkus Armbruster error_report("Shared device number must be greater than 0"); 60285b01e09SMarkus Armbruster exit(EXIT_FAILURE); 6033b05a8e9Sths } 6043b05a8e9Sths break; 605e6b63677SDaniel P. Berrange case 'f': 606e6b63677SDaniel P. Berrange fmt = optarg; 607e6b63677SDaniel P. Berrange break; 60875818250Sths case 't': 60975818250Sths persistent = 1; 61075818250Sths break; 6117a5ca864Sbellard case 'v': 6127a5ca864Sbellard verbose = 1; 6137a5ca864Sbellard break; 6147a5ca864Sbellard case 'V': 6157a5ca864Sbellard version(argv[0]); 6167a5ca864Sbellard exit(0); 6177a5ca864Sbellard break; 6187a5ca864Sbellard case 'h': 6197a5ca864Sbellard usage(argv[0]); 6207a5ca864Sbellard exit(0); 6217a5ca864Sbellard break; 6227a5ca864Sbellard case '?': 62385b01e09SMarkus Armbruster error_report("Try `%s --help' for more information.", argv[0]); 62485b01e09SMarkus Armbruster exit(EXIT_FAILURE); 6250ab3b337SDaniel P. Berrange case QEMU_NBD_OPT_OBJECT: { 6260ab3b337SDaniel P. Berrange QemuOpts *opts; 6270ab3b337SDaniel P. Berrange opts = qemu_opts_parse_noisily(&qemu_object_opts, 6280ab3b337SDaniel P. Berrange optarg, true); 6290ab3b337SDaniel P. Berrange if (!opts) { 6300ab3b337SDaniel P. Berrange exit(EXIT_FAILURE); 6310ab3b337SDaniel P. Berrange } 6320ab3b337SDaniel P. Berrange } break; 6337a5ca864Sbellard } 6347a5ca864Sbellard } 6357a5ca864Sbellard 6367a5ca864Sbellard if ((argc - optind) != 1) { 637433672b0SMarkus Armbruster error_report("Invalid number of arguments"); 638433672b0SMarkus Armbruster error_printf("Try `%s --help' for more information.\n", argv[0]); 63985b01e09SMarkus Armbruster exit(EXIT_FAILURE); 6407a5ca864Sbellard } 6417a5ca864Sbellard 6420ab3b337SDaniel P. Berrange if (qemu_opts_foreach(&qemu_object_opts, 6430ab3b337SDaniel P. Berrange user_creatable_add_opts_foreach, 6440ab3b337SDaniel P. Berrange NULL, &local_err)) { 6450ab3b337SDaniel P. Berrange error_report_err(local_err); 6460ab3b337SDaniel P. Berrange exit(EXIT_FAILURE); 6470ab3b337SDaniel P. Berrange } 6480ab3b337SDaniel P. Berrange 649cd831bd7Sths if (disconnect) { 650*d0d6ff58SDaniel P. Berrange int nbdfd = open(argv[optind], O_RDWR); 651*d0d6ff58SDaniel P. Berrange if (nbdfd < 0) { 65285b01e09SMarkus Armbruster error_report("Cannot open %s: %s", argv[optind], 65385b01e09SMarkus Armbruster strerror(errno)); 65485b01e09SMarkus Armbruster exit(EXIT_FAILURE); 655fc19f8a0SPaolo Bonzini } 656*d0d6ff58SDaniel P. Berrange nbd_disconnect(nbdfd); 657cd831bd7Sths 658*d0d6ff58SDaniel P. Berrange close(nbdfd); 659cd831bd7Sths 660cd831bd7Sths printf("%s disconnected\n", argv[optind]); 661cd831bd7Sths 662cd831bd7Sths return 0; 663cd831bd7Sths } 664cd831bd7Sths 665c1f8fdc3SPaolo Bonzini if (device && !verbose) { 666c1f8fdc3SPaolo Bonzini int stderr_fd[2]; 667c1f8fdc3SPaolo Bonzini pid_t pid; 668c1f8fdc3SPaolo Bonzini int ret; 669c1f8fdc3SPaolo Bonzini 670fc19f8a0SPaolo Bonzini if (qemu_pipe(stderr_fd) < 0) { 67185b01e09SMarkus Armbruster error_report("Error setting up communication pipe: %s", 67285b01e09SMarkus Armbruster strerror(errno)); 67385b01e09SMarkus Armbruster exit(EXIT_FAILURE); 674c1f8fdc3SPaolo Bonzini } 675c1f8fdc3SPaolo Bonzini 676c1f8fdc3SPaolo Bonzini /* Now daemonize, but keep a communication channel open to 677c1f8fdc3SPaolo Bonzini * print errors and exit with the proper status code. 678c1f8fdc3SPaolo Bonzini */ 679c1f8fdc3SPaolo Bonzini pid = fork(); 68070d4739eSMax Reitz if (pid < 0) { 68185b01e09SMarkus Armbruster error_report("Failed to fork: %s", strerror(errno)); 68285b01e09SMarkus Armbruster exit(EXIT_FAILURE); 68370d4739eSMax Reitz } else if (pid == 0) { 684c1f8fdc3SPaolo Bonzini close(stderr_fd[0]); 6859faf31b6SMichael Tokarev ret = qemu_daemon(1, 0); 686c1f8fdc3SPaolo Bonzini 687c1f8fdc3SPaolo Bonzini /* Temporarily redirect stderr to the parent's pipe... */ 688c1f8fdc3SPaolo Bonzini dup2(stderr_fd[1], STDERR_FILENO); 689fc19f8a0SPaolo Bonzini if (ret < 0) { 69085b01e09SMarkus Armbruster error_report("Failed to daemonize: %s", strerror(errno)); 69185b01e09SMarkus Armbruster exit(EXIT_FAILURE); 692c1f8fdc3SPaolo Bonzini } 693c1f8fdc3SPaolo Bonzini 694c1f8fdc3SPaolo Bonzini /* ... close the descriptor we inherited and go on. */ 695c1f8fdc3SPaolo Bonzini close(stderr_fd[1]); 696c1f8fdc3SPaolo Bonzini } else { 697c1f8fdc3SPaolo Bonzini bool errors = false; 698c1f8fdc3SPaolo Bonzini char *buf; 699c1f8fdc3SPaolo Bonzini 700c1f8fdc3SPaolo Bonzini /* In the parent. Print error messages from the child until 701c1f8fdc3SPaolo Bonzini * it closes the pipe. 702c1f8fdc3SPaolo Bonzini */ 703c1f8fdc3SPaolo Bonzini close(stderr_fd[1]); 704c1f8fdc3SPaolo Bonzini buf = g_malloc(1024); 705c1f8fdc3SPaolo Bonzini while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { 706c1f8fdc3SPaolo Bonzini errors = true; 707c1f8fdc3SPaolo Bonzini ret = qemu_write_full(STDERR_FILENO, buf, ret); 708fc19f8a0SPaolo Bonzini if (ret < 0) { 709c1f8fdc3SPaolo Bonzini exit(EXIT_FAILURE); 710c1f8fdc3SPaolo Bonzini } 711c1f8fdc3SPaolo Bonzini } 712fc19f8a0SPaolo Bonzini if (ret < 0) { 71385b01e09SMarkus Armbruster error_report("Cannot read from daemon: %s", 71485b01e09SMarkus Armbruster strerror(errno)); 71585b01e09SMarkus Armbruster exit(EXIT_FAILURE); 716c1f8fdc3SPaolo Bonzini } 717c1f8fdc3SPaolo Bonzini 718c1f8fdc3SPaolo Bonzini /* Usually the daemon should not print any message. 719c1f8fdc3SPaolo Bonzini * Exit with zero status in that case. 720c1f8fdc3SPaolo Bonzini */ 721c1f8fdc3SPaolo Bonzini exit(errors); 722c1f8fdc3SPaolo Bonzini } 723c1f8fdc3SPaolo Bonzini } 724c1f8fdc3SPaolo Bonzini 725a6ac2313SPaolo Bonzini if (device != NULL && sockpath == NULL) { 726b32f6c28SPaolo Bonzini sockpath = g_malloc(128); 727b32f6c28SPaolo Bonzini snprintf(sockpath, 128, SOCKET_PATH, basename(device)); 728cd831bd7Sths } 729cd831bd7Sths 73048bec07eSDaniel P. Berrange saddr = nbd_build_socket_address(sockpath, bindto, port); 73148bec07eSDaniel P. Berrange 7322f78e491SChrysostomos Nanakos if (qemu_init_main_loop(&local_err)) { 733565f65d2SMarkus Armbruster error_report_err(local_err); 7342f78e491SChrysostomos Nanakos exit(EXIT_FAILURE); 7352f78e491SChrysostomos Nanakos } 736802ddc37SPaolo Bonzini bdrv_init(); 737802ddc37SPaolo Bonzini atexit(bdrv_close_all); 738802ddc37SPaolo Bonzini 739e6b63677SDaniel P. Berrange if (fmt) { 7404fbec260SMax Reitz options = qdict_new(); 7414fbec260SMax Reitz qdict_put(options, "driver", qstring_from_str(fmt)); 742e6b63677SDaniel P. Berrange } 74398522f63SKevin Wolf 744802ddc37SPaolo Bonzini srcpath = argv[optind]; 7454fbec260SMax Reitz blk = blk_new_open("hda", srcpath, NULL, options, flags, &local_err); 7464fbec260SMax Reitz if (!blk) { 747c29b77f9SMarkus Armbruster error_reportf_err(local_err, "Failed to blk_new_open '%s': ", 748c29b77f9SMarkus Armbruster argv[optind]); 74985b01e09SMarkus Armbruster exit(EXIT_FAILURE); 750802ddc37SPaolo Bonzini } 7514fbec260SMax Reitz bs = blk_bs(blk); 752802ddc37SPaolo Bonzini 7538c116b0eSWenchao Xia if (sn_opts) { 7548c116b0eSWenchao Xia ret = bdrv_snapshot_load_tmp(bs, 7558c116b0eSWenchao Xia qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID), 7568c116b0eSWenchao Xia qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME), 7578c116b0eSWenchao Xia &local_err); 7588c116b0eSWenchao Xia } else if (sn_id_or_name) { 7598c116b0eSWenchao Xia ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name, 7608c116b0eSWenchao Xia &local_err); 7618c116b0eSWenchao Xia } 7628c116b0eSWenchao Xia if (ret < 0) { 763c29b77f9SMarkus Armbruster error_reportf_err(local_err, "Failed to load snapshot: "); 76485b01e09SMarkus Armbruster exit(EXIT_FAILURE); 7658c116b0eSWenchao Xia } 7668c116b0eSWenchao Xia 767b3838a40SPeter Lieven bs->detect_zeroes = detect_zeroes; 7684c58e80aSMax Reitz fd_size = blk_getlength(blk); 76998f44bbeSMax Reitz if (fd_size < 0) { 77085b01e09SMarkus Armbruster error_report("Failed to determine the image length: %s", 77198f44bbeSMax Reitz strerror(-fd_size)); 77285b01e09SMarkus Armbruster exit(EXIT_FAILURE); 77398f44bbeSMax Reitz } 774802ddc37SPaolo Bonzini 775185b4338SPaolo Bonzini if (partition != -1) { 7764c58e80aSMax Reitz ret = find_partition(blk, partition, &dev_offset, &fd_size); 777185b4338SPaolo Bonzini if (ret < 0) { 77885b01e09SMarkus Armbruster error_report("Could not find partition %d: %s", partition, 779a4699e55SMarkus Armbruster strerror(-ret)); 78085b01e09SMarkus Armbruster exit(EXIT_FAILURE); 781802ddc37SPaolo Bonzini } 782185b4338SPaolo Bonzini } 783802ddc37SPaolo Bonzini 78498f44bbeSMax Reitz exp = nbd_export_new(blk, dev_offset, fd_size, nbdflags, nbd_export_closed, 78598f44bbeSMax Reitz &local_err); 78698f44bbeSMax Reitz if (!exp) { 7874fffeb5eSMarkus Armbruster error_report_err(local_err); 78885b01e09SMarkus Armbruster exit(EXIT_FAILURE); 78998f44bbeSMax Reitz } 7903b05a8e9Sths 791*d0d6ff58SDaniel P. Berrange server_ioc = qio_channel_socket_new(); 792*d0d6ff58SDaniel P. Berrange if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) { 793*d0d6ff58SDaniel P. Berrange object_unref(OBJECT(server_ioc)); 79448bec07eSDaniel P. Berrange error_report_err(local_err); 7957a5ca864Sbellard return 1; 796a61c6782SPaolo Bonzini } 797f1ef5555SPaolo Bonzini 798f1ef5555SPaolo Bonzini if (device) { 799f1ef5555SPaolo Bonzini int ret; 800f1ef5555SPaolo Bonzini 801a6ac2313SPaolo Bonzini ret = pthread_create(&client_thread, NULL, nbd_client_thread, device); 802f1ef5555SPaolo Bonzini if (ret != 0) { 80385b01e09SMarkus Armbruster error_report("Failed to create client thread: %s", strerror(ret)); 80485b01e09SMarkus Armbruster exit(EXIT_FAILURE); 805f1ef5555SPaolo Bonzini } 806f1ef5555SPaolo Bonzini } else { 807f1ef5555SPaolo Bonzini /* Shut up GCC warnings. */ 808f1ef5555SPaolo Bonzini memset(&client_thread, 0, sizeof(client_thread)); 809f1ef5555SPaolo Bonzini } 810f1ef5555SPaolo Bonzini 811*d0d6ff58SDaniel P. Berrange nbd_update_server_watch(); 8127a5ca864Sbellard 8139faf31b6SMichael Tokarev /* now when the initialization is (almost) complete, chdir("/") 8149faf31b6SMichael Tokarev * to free any busy filesystems */ 8159faf31b6SMichael Tokarev if (chdir("/") < 0) { 81685b01e09SMarkus Armbruster error_report("Could not chdir to root directory: %s", 81785b01e09SMarkus Armbruster strerror(errno)); 81885b01e09SMarkus Armbruster exit(EXIT_FAILURE); 8199faf31b6SMichael Tokarev } 8209faf31b6SMichael Tokarev 8217860a380SPaolo Bonzini state = RUNNING; 8223b05a8e9Sths do { 823a61c6782SPaolo Bonzini main_loop_wait(false); 8247860a380SPaolo Bonzini if (state == TERMINATE) { 8257860a380SPaolo Bonzini state = TERMINATING; 826af49bbbeSPaolo Bonzini nbd_export_close(exp); 8272c8d9f06SPaolo Bonzini nbd_export_put(exp); 8287860a380SPaolo Bonzini exp = NULL; 8297860a380SPaolo Bonzini } 8307860a380SPaolo Bonzini } while (state != TERMINATED); 8312c8d9f06SPaolo Bonzini 83226f54e9aSMarkus Armbruster blk_unref(blk); 833b32f6c28SPaolo Bonzini if (sockpath) { 834b32f6c28SPaolo Bonzini unlink(sockpath); 835b32f6c28SPaolo Bonzini } 8367a5ca864Sbellard 8378c116b0eSWenchao Xia qemu_opts_del(sn_opts); 8388c116b0eSWenchao Xia 839a517e88bSPaolo Bonzini if (device) { 840a517e88bSPaolo Bonzini void *ret; 841a517e88bSPaolo Bonzini pthread_join(client_thread, &ret); 842a517e88bSPaolo Bonzini exit(ret != NULL); 843a517e88bSPaolo Bonzini } else { 844a517e88bSPaolo Bonzini exit(EXIT_SUCCESS); 845a517e88bSPaolo Bonzini } 8467a5ca864Sbellard } 847