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 195a61cb60SStefan Weil #include "qemu-common.h" 2026f54e9aSMarkus Armbruster #include "sysemu/block-backend.h" 21b3838a40SPeter Lieven #include "block/block_int.h" 22737e150eSPaolo Bonzini #include "block/nbd.h" 236a1751b7SAlex Bligh #include "qemu/main-loop.h" 24537b41f5SPaolo Bonzini #include "qemu/sockets.h" 25537b41f5SPaolo Bonzini #include "qemu/error-report.h" 268c116b0eSWenchao Xia #include "block/snapshot.h" 27b3838a40SPeter Lieven #include "qapi/util.h" 28d49b6836SMarkus Armbruster #include "qapi/qmp/qstring.h" 297a5ca864Sbellard 307a5ca864Sbellard #include <stdarg.h> 317a5ca864Sbellard #include <stdio.h> 327a5ca864Sbellard #include <getopt.h> 337a5ca864Sbellard #include <err.h> 34cd831bd7Sths #include <sys/types.h> 357a5ca864Sbellard #include <sys/socket.h> 367a5ca864Sbellard #include <netinet/in.h> 377a5ca864Sbellard #include <netinet/tcp.h> 387a5ca864Sbellard #include <arpa/inet.h> 39cd831bd7Sths #include <signal.h> 402bff4b6fSBlue Swirl #include <libgen.h> 41a517e88bSPaolo Bonzini #include <pthread.h> 42cd831bd7Sths 43cd831bd7Sths #define SOCKET_PATH "/var/lock/qemu-nbd-%s" 4439a5235cSPaolo Bonzini #define QEMU_NBD_OPT_CACHE 1 4539a5235cSPaolo Bonzini #define QEMU_NBD_OPT_AIO 2 46ded9d2d5SPaolo Bonzini #define QEMU_NBD_OPT_DISCARD 3 47b3838a40SPeter Lieven #define QEMU_NBD_OPT_DETECT_ZEROES 4 487a5ca864Sbellard 49af49bbbeSPaolo Bonzini static NBDExport *exp; 50b1d8e52eSblueswir1 static int verbose; 51a517e88bSPaolo Bonzini static char *srcpath; 52a517e88bSPaolo Bonzini static char *sockpath; 537860a380SPaolo Bonzini static int persistent = 0; 547860a380SPaolo Bonzini static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state; 55a61c6782SPaolo Bonzini static int shared = 1; 56a61c6782SPaolo Bonzini static int nb_fds; 57e4afbf4fSFam Zheng static int server_fd; 587a5ca864Sbellard 597a5ca864Sbellard static void usage(const char *name) 607a5ca864Sbellard { 61b033cd86SPaolo Bonzini (printf) ( 627a5ca864Sbellard "Usage: %s [OPTIONS] FILE\n" 637a5ca864Sbellard "QEMU Disk Network Block Device Server\n" 647a5ca864Sbellard "\n" 657a5ca864Sbellard " -h, --help display this help and exit\n" 667a5ca864Sbellard " -V, --version output version information and exit\n" 677a5ca864Sbellard "\n" 68b033cd86SPaolo Bonzini "Connection properties:\n" 69b033cd86SPaolo Bonzini " -p, --port=PORT port to listen on (default `%d')\n" 70b033cd86SPaolo Bonzini " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" 71b033cd86SPaolo Bonzini " -k, --socket=PATH path to the unix socket\n" 72b033cd86SPaolo Bonzini " (default '"SOCKET_PATH"')\n" 73b033cd86SPaolo Bonzini " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" 74b033cd86SPaolo Bonzini " -t, --persistent don't exit on the last connection\n" 75b033cd86SPaolo Bonzini " -v, --verbose display extra debugging information\n" 76b033cd86SPaolo Bonzini "\n" 77b033cd86SPaolo Bonzini "Exposing part of the image:\n" 78b033cd86SPaolo Bonzini " -o, --offset=OFFSET offset into the image\n" 79b033cd86SPaolo Bonzini " -P, --partition=NUM only expose partition NUM\n" 80b033cd86SPaolo Bonzini "\n" 81b033cd86SPaolo Bonzini #ifdef __linux__ 82b033cd86SPaolo Bonzini "Kernel NBD client support:\n" 83b033cd86SPaolo Bonzini " -c, --connect=DEV connect FILE to the local NBD device DEV\n" 84b033cd86SPaolo Bonzini " -d, --disconnect disconnect the specified device\n" 85b033cd86SPaolo Bonzini "\n" 86b033cd86SPaolo Bonzini #endif 87b033cd86SPaolo Bonzini "\n" 88b033cd86SPaolo Bonzini "Block device options:\n" 894323fdcfSWenchao Xia " -f, --format=FORMAT set image format (raw, qcow2, ...)\n" 90b033cd86SPaolo Bonzini " -r, --read-only export read-only\n" 918c116b0eSWenchao Xia " -s, --snapshot use FILE as an external snapshot, create a temporary\n" 928c116b0eSWenchao Xia " file with backing_file=FILE, redirect the write to\n" 938c116b0eSWenchao Xia " the temporary one\n" 948c116b0eSWenchao Xia " -l, --load-snapshot=SNAPSHOT_PARAM\n" 958c116b0eSWenchao Xia " load an internal snapshot inside FILE and export it\n" 968c116b0eSWenchao Xia " as an read-only device, SNAPSHOT_PARAM format is\n" 978c116b0eSWenchao Xia " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n" 988c116b0eSWenchao Xia " '[ID_OR_NAME]'\n" 99b033cd86SPaolo Bonzini " -n, --nocache disable host cache\n" 10039a5235cSPaolo Bonzini " --cache=MODE set cache mode (none, writeback, ...)\n" 10139a5235cSPaolo Bonzini #ifdef CONFIG_LINUX_AIO 10239a5235cSPaolo Bonzini " --aio=MODE set AIO mode (native or threads)\n" 10339a5235cSPaolo Bonzini #endif 104b3838a40SPeter Lieven " --discard=MODE set discard mode (ignore, unmap)\n" 105*6883de6cSAndrey Korolyov " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n" 106b033cd86SPaolo Bonzini "\n" 107b033cd86SPaolo Bonzini "Report bugs to <qemu-devel@nongnu.org>\n" 108c2e2872bSLaurent Vivier , name, NBD_DEFAULT_PORT, "DEVICE"); 1097a5ca864Sbellard } 1107a5ca864Sbellard 1117a5ca864Sbellard static void version(const char *name) 1127a5ca864Sbellard { 1137a5ca864Sbellard printf( 114315bc7aaSths "%s version 0.0.1\n" 1157a5ca864Sbellard "Written by Anthony Liguori.\n" 1167a5ca864Sbellard "\n" 1177a5ca864Sbellard "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n" 1187a5ca864Sbellard "This is free software; see the source for copying conditions. There is NO\n" 1197a5ca864Sbellard "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" 120315bc7aaSths , name); 1217a5ca864Sbellard } 1227a5ca864Sbellard 1237a5ca864Sbellard struct partition_record 1247a5ca864Sbellard { 1257a5ca864Sbellard uint8_t bootable; 1267a5ca864Sbellard uint8_t start_head; 1277a5ca864Sbellard uint32_t start_cylinder; 1287a5ca864Sbellard uint8_t start_sector; 1297a5ca864Sbellard uint8_t system; 1307a5ca864Sbellard uint8_t end_head; 1317a5ca864Sbellard uint8_t end_cylinder; 1327a5ca864Sbellard uint8_t end_sector; 1337a5ca864Sbellard uint32_t start_sector_abs; 1347a5ca864Sbellard uint32_t nb_sectors_abs; 1357a5ca864Sbellard }; 1367a5ca864Sbellard 1377a5ca864Sbellard static void read_partition(uint8_t *p, struct partition_record *r) 1387a5ca864Sbellard { 1397a5ca864Sbellard r->bootable = p[0]; 1407a5ca864Sbellard r->start_head = p[1]; 1417a5ca864Sbellard r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); 1427a5ca864Sbellard r->start_sector = p[2] & 0x3f; 1437a5ca864Sbellard r->system = p[4]; 1447a5ca864Sbellard r->end_head = p[5]; 1457a5ca864Sbellard r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); 1467a5ca864Sbellard r->end_sector = p[6] & 0x3f; 147ac97393dSMax Reitz 148ac97393dSMax Reitz r->start_sector_abs = le32_to_cpup((uint32_t *)(p + 8)); 149ac97393dSMax Reitz r->nb_sectors_abs = le32_to_cpup((uint32_t *)(p + 12)); 1507a5ca864Sbellard } 1517a5ca864Sbellard 1524c58e80aSMax Reitz static int find_partition(BlockBackend *blk, int partition, 1537a5ca864Sbellard off_t *offset, off_t *size) 1547a5ca864Sbellard { 1557a5ca864Sbellard struct partition_record mbr[4]; 1567a5ca864Sbellard uint8_t data[512]; 1577a5ca864Sbellard int i; 1587a5ca864Sbellard int ext_partnum = 4; 159cb7cf0e3SRyota Ozaki int ret; 1607a5ca864Sbellard 1614c58e80aSMax Reitz if ((ret = blk_read(blk, 0, data, 1)) < 0) { 162cb7cf0e3SRyota Ozaki errno = -ret; 163cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "error while reading"); 164cb7cf0e3SRyota Ozaki } 1657a5ca864Sbellard 1667a5ca864Sbellard if (data[510] != 0x55 || data[511] != 0xaa) { 167185b4338SPaolo Bonzini return -EINVAL; 1687a5ca864Sbellard } 1697a5ca864Sbellard 1707a5ca864Sbellard for (i = 0; i < 4; i++) { 1717a5ca864Sbellard read_partition(&data[446 + 16 * i], &mbr[i]); 1727a5ca864Sbellard 173453b07b1SMax Reitz if (!mbr[i].system || !mbr[i].nb_sectors_abs) { 1747a5ca864Sbellard continue; 175453b07b1SMax Reitz } 1767a5ca864Sbellard 1777a5ca864Sbellard if (mbr[i].system == 0xF || mbr[i].system == 0x5) { 1787a5ca864Sbellard struct partition_record ext[4]; 1797a5ca864Sbellard uint8_t data1[512]; 1807a5ca864Sbellard int j; 1817a5ca864Sbellard 1824c58e80aSMax Reitz if ((ret = blk_read(blk, mbr[i].start_sector_abs, data1, 1)) < 0) { 183cb7cf0e3SRyota Ozaki errno = -ret; 184cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "error while reading"); 185cb7cf0e3SRyota Ozaki } 1867a5ca864Sbellard 1877a5ca864Sbellard for (j = 0; j < 4; j++) { 1887a5ca864Sbellard read_partition(&data1[446 + 16 * j], &ext[j]); 189453b07b1SMax Reitz if (!ext[j].system || !ext[j].nb_sectors_abs) { 1907a5ca864Sbellard continue; 191453b07b1SMax Reitz } 1927a5ca864Sbellard 1937a5ca864Sbellard if ((ext_partnum + j + 1) == partition) { 1947a5ca864Sbellard *offset = (uint64_t)ext[j].start_sector_abs << 9; 1957a5ca864Sbellard *size = (uint64_t)ext[j].nb_sectors_abs << 9; 1967a5ca864Sbellard return 0; 1977a5ca864Sbellard } 1987a5ca864Sbellard } 1997a5ca864Sbellard ext_partnum += 4; 2007a5ca864Sbellard } else if ((i + 1) == partition) { 2017a5ca864Sbellard *offset = (uint64_t)mbr[i].start_sector_abs << 9; 2027a5ca864Sbellard *size = (uint64_t)mbr[i].nb_sectors_abs << 9; 2037a5ca864Sbellard return 0; 2047a5ca864Sbellard } 2057a5ca864Sbellard } 2067a5ca864Sbellard 207185b4338SPaolo Bonzini return -ENOENT; 2087a5ca864Sbellard } 2097a5ca864Sbellard 210bb345110SPaolo Bonzini static void termsig_handler(int signum) 211bb345110SPaolo Bonzini { 2127860a380SPaolo Bonzini state = TERMINATE; 213a61c6782SPaolo Bonzini qemu_notify_event(); 214bb345110SPaolo Bonzini } 215bb345110SPaolo Bonzini 216537b41f5SPaolo Bonzini static void combine_addr(char *buf, size_t len, const char* address, 217537b41f5SPaolo Bonzini uint16_t port) 218537b41f5SPaolo Bonzini { 219537b41f5SPaolo Bonzini /* If the address-part contains a colon, it's an IPv6 IP so needs [] */ 220537b41f5SPaolo Bonzini if (strstr(address, ":")) { 221537b41f5SPaolo Bonzini snprintf(buf, len, "[%s]:%u", address, port); 222537b41f5SPaolo Bonzini } else { 223537b41f5SPaolo Bonzini snprintf(buf, len, "%s:%u", address, port); 224537b41f5SPaolo Bonzini } 225537b41f5SPaolo Bonzini } 226537b41f5SPaolo Bonzini 227537b41f5SPaolo Bonzini static int tcp_socket_incoming(const char *address, uint16_t port) 228537b41f5SPaolo Bonzini { 229537b41f5SPaolo Bonzini char address_and_port[128]; 230537b41f5SPaolo Bonzini Error *local_err = NULL; 231537b41f5SPaolo Bonzini 232537b41f5SPaolo Bonzini combine_addr(address_and_port, 128, address, port); 233537b41f5SPaolo Bonzini int fd = inet_listen(address_and_port, NULL, 0, SOCK_STREAM, 0, &local_err); 234537b41f5SPaolo Bonzini 235537b41f5SPaolo Bonzini if (local_err != NULL) { 236565f65d2SMarkus Armbruster error_report_err(local_err); 237537b41f5SPaolo Bonzini } 238537b41f5SPaolo Bonzini return fd; 239537b41f5SPaolo Bonzini } 240537b41f5SPaolo Bonzini 241537b41f5SPaolo Bonzini static int unix_socket_incoming(const char *path) 242537b41f5SPaolo Bonzini { 243537b41f5SPaolo Bonzini Error *local_err = NULL; 244537b41f5SPaolo Bonzini int fd = unix_listen(path, NULL, 0, &local_err); 245537b41f5SPaolo Bonzini 246537b41f5SPaolo Bonzini if (local_err != NULL) { 247565f65d2SMarkus Armbruster error_report_err(local_err); 248537b41f5SPaolo Bonzini } 249537b41f5SPaolo Bonzini return fd; 250537b41f5SPaolo Bonzini } 251537b41f5SPaolo Bonzini 252537b41f5SPaolo Bonzini static int unix_socket_outgoing(const char *path) 253537b41f5SPaolo Bonzini { 254537b41f5SPaolo Bonzini Error *local_err = NULL; 255537b41f5SPaolo Bonzini int fd = unix_connect(path, &local_err); 256537b41f5SPaolo Bonzini 257537b41f5SPaolo Bonzini if (local_err != NULL) { 258565f65d2SMarkus Armbruster error_report_err(local_err); 259537b41f5SPaolo Bonzini } 260537b41f5SPaolo Bonzini return fd; 261537b41f5SPaolo Bonzini } 262537b41f5SPaolo Bonzini 263a517e88bSPaolo Bonzini static void *show_parts(void *arg) 264cd831bd7Sths { 265a6ac2313SPaolo Bonzini char *device = arg; 266cd831bd7Sths int nbd; 267cd831bd7Sths 268cd831bd7Sths /* linux just needs an open() to trigger 269cd831bd7Sths * the partition table update 270cd831bd7Sths * but remember to load the module with max_part != 0 : 271cd831bd7Sths * modprobe nbd max_part=63 272cd831bd7Sths */ 273cd831bd7Sths nbd = open(device, O_RDWR); 274fc19f8a0SPaolo Bonzini if (nbd >= 0) { 275cd831bd7Sths close(nbd); 276cd831bd7Sths } 277a517e88bSPaolo Bonzini return NULL; 278a517e88bSPaolo Bonzini } 279a517e88bSPaolo Bonzini 280a517e88bSPaolo Bonzini static void *nbd_client_thread(void *arg) 281a517e88bSPaolo Bonzini { 282a6ac2313SPaolo Bonzini char *device = arg; 283a517e88bSPaolo Bonzini off_t size; 284a517e88bSPaolo Bonzini uint32_t nbdflags; 285a6ac2313SPaolo Bonzini int fd, sock; 286a517e88bSPaolo Bonzini int ret; 287a517e88bSPaolo Bonzini pthread_t show_parts_thread; 2881ce52846SMax Reitz Error *local_error = NULL; 289a517e88bSPaolo Bonzini 290a517e88bSPaolo Bonzini sock = unix_socket_outgoing(sockpath); 291fc19f8a0SPaolo Bonzini if (sock < 0) { 292a517e88bSPaolo Bonzini goto out; 293a517e88bSPaolo Bonzini } 294a517e88bSPaolo Bonzini 295a517e88bSPaolo Bonzini ret = nbd_receive_negotiate(sock, NULL, &nbdflags, 2963f472659SMax Reitz &size, &local_error); 297fc19f8a0SPaolo Bonzini if (ret < 0) { 2981ce52846SMax Reitz if (local_error) { 2991ce52846SMax Reitz fprintf(stderr, "%s\n", error_get_pretty(local_error)); 3001ce52846SMax Reitz error_free(local_error); 3011ce52846SMax Reitz } 3020c544d73SPaolo Bonzini goto out_socket; 303a517e88bSPaolo Bonzini } 304a517e88bSPaolo Bonzini 305a6ac2313SPaolo Bonzini fd = open(device, O_RDWR); 306fc19f8a0SPaolo Bonzini if (fd < 0) { 307a6ac2313SPaolo Bonzini /* Linux-only, we can use %m in printf. */ 3085672ee54SHani Benhabiles fprintf(stderr, "Failed to open %s: %m\n", device); 3090c544d73SPaolo Bonzini goto out_socket; 310a6ac2313SPaolo Bonzini } 311a6ac2313SPaolo Bonzini 3123f472659SMax Reitz ret = nbd_init(fd, sock, nbdflags, size); 313fc19f8a0SPaolo Bonzini if (ret < 0) { 3140c544d73SPaolo Bonzini goto out_fd; 315a517e88bSPaolo Bonzini } 316a517e88bSPaolo Bonzini 317a517e88bSPaolo Bonzini /* update partition table */ 318a6ac2313SPaolo Bonzini pthread_create(&show_parts_thread, NULL, show_parts, device); 319a517e88bSPaolo Bonzini 320c1f8fdc3SPaolo Bonzini if (verbose) { 321a517e88bSPaolo Bonzini fprintf(stderr, "NBD device %s is now connected to %s\n", 322a517e88bSPaolo Bonzini device, srcpath); 323c1f8fdc3SPaolo Bonzini } else { 324c1f8fdc3SPaolo Bonzini /* Close stderr so that the qemu-nbd process exits. */ 325c1f8fdc3SPaolo Bonzini dup2(STDOUT_FILENO, STDERR_FILENO); 326c1f8fdc3SPaolo Bonzini } 327a517e88bSPaolo Bonzini 328a517e88bSPaolo Bonzini ret = nbd_client(fd); 329a517e88bSPaolo Bonzini if (ret) { 3300c544d73SPaolo Bonzini goto out_fd; 331a517e88bSPaolo Bonzini } 332a517e88bSPaolo Bonzini close(fd); 333a517e88bSPaolo Bonzini kill(getpid(), SIGTERM); 334a517e88bSPaolo Bonzini return (void *) EXIT_SUCCESS; 335a517e88bSPaolo Bonzini 3360c544d73SPaolo Bonzini out_fd: 3370c544d73SPaolo Bonzini close(fd); 3380c544d73SPaolo Bonzini out_socket: 3390c544d73SPaolo Bonzini closesocket(sock); 340a517e88bSPaolo Bonzini out: 341a517e88bSPaolo Bonzini kill(getpid(), SIGTERM); 342a517e88bSPaolo Bonzini return (void *) EXIT_FAILURE; 343cd831bd7Sths } 344cd831bd7Sths 345e4afbf4fSFam Zheng static int nbd_can_accept(void) 346a61c6782SPaolo Bonzini { 347a61c6782SPaolo Bonzini return nb_fds < shared; 348a61c6782SPaolo Bonzini } 349a61c6782SPaolo Bonzini 3507860a380SPaolo Bonzini static void nbd_export_closed(NBDExport *exp) 3517860a380SPaolo Bonzini { 3527860a380SPaolo Bonzini assert(state == TERMINATING); 3537860a380SPaolo Bonzini state = TERMINATED; 3547860a380SPaolo Bonzini } 3557860a380SPaolo Bonzini 356e4afbf4fSFam Zheng static void nbd_update_server_fd_handler(int fd); 357e4afbf4fSFam Zheng 3581743b515SPaolo Bonzini static void nbd_client_closed(NBDClient *client) 359a61c6782SPaolo Bonzini { 360a61c6782SPaolo Bonzini nb_fds--; 3617860a380SPaolo Bonzini if (nb_fds == 0 && !persistent && state == RUNNING) { 3627860a380SPaolo Bonzini state = TERMINATE; 3637860a380SPaolo Bonzini } 364e4afbf4fSFam Zheng nbd_update_server_fd_handler(server_fd); 3657860a380SPaolo Bonzini nbd_client_put(client); 366a61c6782SPaolo Bonzini } 367a61c6782SPaolo Bonzini 368a61c6782SPaolo Bonzini static void nbd_accept(void *opaque) 369a61c6782SPaolo Bonzini { 370a61c6782SPaolo Bonzini struct sockaddr_in addr; 371a61c6782SPaolo Bonzini socklen_t addr_len = sizeof(addr); 372a61c6782SPaolo Bonzini 373a61c6782SPaolo Bonzini int fd = accept(server_fd, (struct sockaddr *)&addr, &addr_len); 3740c544d73SPaolo Bonzini if (fd < 0) { 3750c544d73SPaolo Bonzini perror("accept"); 3760c544d73SPaolo Bonzini return; 3770c544d73SPaolo Bonzini } 3780c544d73SPaolo Bonzini 3797860a380SPaolo Bonzini if (state >= TERMINATE) { 3807860a380SPaolo Bonzini close(fd); 3817860a380SPaolo Bonzini return; 3827860a380SPaolo Bonzini } 3837860a380SPaolo Bonzini 38436af5994SHani Benhabiles if (nbd_client_new(exp, fd, nbd_client_closed)) { 385a61c6782SPaolo Bonzini nb_fds++; 386e4afbf4fSFam Zheng nbd_update_server_fd_handler(server_fd); 38736af5994SHani Benhabiles } else { 38827e5eae4SHani Benhabiles shutdown(fd, 2); 38936af5994SHani Benhabiles close(fd); 390a61c6782SPaolo Bonzini } 391a61c6782SPaolo Bonzini } 392a61c6782SPaolo Bonzini 393e4afbf4fSFam Zheng static void nbd_update_server_fd_handler(int fd) 394e4afbf4fSFam Zheng { 395e4afbf4fSFam Zheng if (nbd_can_accept()) { 396e4afbf4fSFam Zheng qemu_set_fd_handler(fd, nbd_accept, NULL, (void *)(uintptr_t)fd); 397e4afbf4fSFam Zheng } else { 398e4afbf4fSFam Zheng qemu_set_fd_handler(fd, NULL, NULL, NULL); 399e4afbf4fSFam Zheng } 400e4afbf4fSFam Zheng } 401e4afbf4fSFam Zheng 4027a5ca864Sbellard int main(int argc, char **argv) 4037a5ca864Sbellard { 40426f54e9aSMarkus Armbruster BlockBackend *blk; 4057a5ca864Sbellard BlockDriverState *bs; 4067a5ca864Sbellard off_t dev_offset = 0; 407b90fb4b8SPaolo Bonzini uint32_t nbdflags = 0; 408cd831bd7Sths bool disconnect = false; 4097a5ca864Sbellard const char *bindto = "0.0.0.0"; 410a6ac2313SPaolo Bonzini char *device = NULL; 411c2e2872bSLaurent Vivier int port = NBD_DEFAULT_PORT; 4127a5ca864Sbellard off_t fd_size; 4138c116b0eSWenchao Xia QemuOpts *sn_opts = NULL; 4148c116b0eSWenchao Xia const char *sn_id_or_name = NULL; 4158c116b0eSWenchao Xia const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:"; 4167a5ca864Sbellard struct option lopt[] = { 417660f11beSBlue Swirl { "help", 0, NULL, 'h' }, 418660f11beSBlue Swirl { "version", 0, NULL, 'V' }, 419660f11beSBlue Swirl { "bind", 1, NULL, 'b' }, 420660f11beSBlue Swirl { "port", 1, NULL, 'p' }, 421660f11beSBlue Swirl { "socket", 1, NULL, 'k' }, 422660f11beSBlue Swirl { "offset", 1, NULL, 'o' }, 423660f11beSBlue Swirl { "read-only", 0, NULL, 'r' }, 424660f11beSBlue Swirl { "partition", 1, NULL, 'P' }, 425660f11beSBlue Swirl { "connect", 1, NULL, 'c' }, 426660f11beSBlue Swirl { "disconnect", 0, NULL, 'd' }, 427660f11beSBlue Swirl { "snapshot", 0, NULL, 's' }, 4288c116b0eSWenchao Xia { "load-snapshot", 1, NULL, 'l' }, 429660f11beSBlue Swirl { "nocache", 0, NULL, 'n' }, 43039a5235cSPaolo Bonzini { "cache", 1, NULL, QEMU_NBD_OPT_CACHE }, 43139a5235cSPaolo Bonzini #ifdef CONFIG_LINUX_AIO 43239a5235cSPaolo Bonzini { "aio", 1, NULL, QEMU_NBD_OPT_AIO }, 43339a5235cSPaolo Bonzini #endif 434ded9d2d5SPaolo Bonzini { "discard", 1, NULL, QEMU_NBD_OPT_DISCARD }, 435b3838a40SPeter Lieven { "detect-zeroes", 1, NULL, QEMU_NBD_OPT_DETECT_ZEROES }, 436660f11beSBlue Swirl { "shared", 1, NULL, 'e' }, 437e6b63677SDaniel P. Berrange { "format", 1, NULL, 'f' }, 438660f11beSBlue Swirl { "persistent", 0, NULL, 't' }, 439660f11beSBlue Swirl { "verbose", 0, NULL, 'v' }, 440660f11beSBlue Swirl { NULL, 0, NULL, 0 } 4417a5ca864Sbellard }; 4427a5ca864Sbellard int ch; 4437a5ca864Sbellard int opt_ind = 0; 4447a5ca864Sbellard int li; 4457a5ca864Sbellard char *end; 446f5edb014SNaphtali Sprei int flags = BDRV_O_RDWR; 4477a5ca864Sbellard int partition = -1; 4484fbec260SMax Reitz int ret = 0; 4493b05a8e9Sths int fd; 45039a5235cSPaolo Bonzini bool seen_cache = false; 451ded9d2d5SPaolo Bonzini bool seen_discard = false; 45239a5235cSPaolo Bonzini #ifdef CONFIG_LINUX_AIO 45339a5235cSPaolo Bonzini bool seen_aio = false; 45439a5235cSPaolo Bonzini #endif 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); 46810f5bff6SFam Zheng qemu_init_exec_dir(argv[0]); 469bb345110SPaolo Bonzini 4707a5ca864Sbellard while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { 4717a5ca864Sbellard switch (ch) { 4727a5ca864Sbellard case 's': 4732f726488Sths flags |= BDRV_O_SNAPSHOT; 4742f726488Sths break; 4752f726488Sths case 'n': 47639a5235cSPaolo Bonzini optarg = (char *) "none"; 47739a5235cSPaolo Bonzini /* fallthrough */ 47839a5235cSPaolo Bonzini case QEMU_NBD_OPT_CACHE: 47939a5235cSPaolo Bonzini if (seen_cache) { 48039a5235cSPaolo Bonzini errx(EXIT_FAILURE, "-n and --cache can only be specified once"); 48139a5235cSPaolo Bonzini } 48239a5235cSPaolo Bonzini seen_cache = true; 48339a5235cSPaolo Bonzini if (bdrv_parse_cache_flags(optarg, &flags) == -1) { 48439a5235cSPaolo Bonzini errx(EXIT_FAILURE, "Invalid cache mode `%s'", optarg); 48539a5235cSPaolo Bonzini } 4867a5ca864Sbellard break; 48739a5235cSPaolo Bonzini #ifdef CONFIG_LINUX_AIO 48839a5235cSPaolo Bonzini case QEMU_NBD_OPT_AIO: 48939a5235cSPaolo Bonzini if (seen_aio) { 49039a5235cSPaolo Bonzini errx(EXIT_FAILURE, "--aio can only be specified once"); 49139a5235cSPaolo Bonzini } 49239a5235cSPaolo Bonzini seen_aio = true; 49339a5235cSPaolo Bonzini if (!strcmp(optarg, "native")) { 49439a5235cSPaolo Bonzini flags |= BDRV_O_NATIVE_AIO; 49539a5235cSPaolo Bonzini } else if (!strcmp(optarg, "threads")) { 49639a5235cSPaolo Bonzini /* this is the default */ 49739a5235cSPaolo Bonzini } else { 49839a5235cSPaolo Bonzini errx(EXIT_FAILURE, "invalid aio mode `%s'", optarg); 49939a5235cSPaolo Bonzini } 50039a5235cSPaolo Bonzini break; 50139a5235cSPaolo Bonzini #endif 502ded9d2d5SPaolo Bonzini case QEMU_NBD_OPT_DISCARD: 503ded9d2d5SPaolo Bonzini if (seen_discard) { 504ded9d2d5SPaolo Bonzini errx(EXIT_FAILURE, "--discard can only be specified once"); 505ded9d2d5SPaolo Bonzini } 506ded9d2d5SPaolo Bonzini seen_discard = true; 507ded9d2d5SPaolo Bonzini if (bdrv_parse_discard_flags(optarg, &flags) == -1) { 508ded9d2d5SPaolo Bonzini errx(EXIT_FAILURE, "Invalid discard mode `%s'", optarg); 509ded9d2d5SPaolo Bonzini } 510ded9d2d5SPaolo Bonzini break; 511b3838a40SPeter Lieven case QEMU_NBD_OPT_DETECT_ZEROES: 512b3838a40SPeter Lieven detect_zeroes = 513b3838a40SPeter Lieven qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, 514b3838a40SPeter Lieven optarg, 515b3838a40SPeter Lieven BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX, 516b3838a40SPeter Lieven BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 517b3838a40SPeter Lieven &local_err); 518b3838a40SPeter Lieven if (local_err) { 519b3838a40SPeter Lieven errx(EXIT_FAILURE, "Failed to parse detect_zeroes mode: %s", 520b3838a40SPeter Lieven error_get_pretty(local_err)); 521b3838a40SPeter Lieven } 522b3838a40SPeter Lieven if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 523b3838a40SPeter Lieven !(flags & BDRV_O_UNMAP)) { 524b3838a40SPeter Lieven errx(EXIT_FAILURE, "setting detect-zeroes to unmap is not allowed " 525b3838a40SPeter Lieven "without setting discard operation to unmap"); 526b3838a40SPeter Lieven } 527b3838a40SPeter Lieven break; 5287a5ca864Sbellard case 'b': 5297a5ca864Sbellard bindto = optarg; 5307a5ca864Sbellard break; 5317a5ca864Sbellard case 'p': 5327a5ca864Sbellard li = strtol(optarg, &end, 0); 5337a5ca864Sbellard if (*end) { 534b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid port `%s'", optarg); 5357a5ca864Sbellard } 5367a5ca864Sbellard if (li < 1 || li > 65535) { 537b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Port out of range `%s'", optarg); 5387a5ca864Sbellard } 5397a5ca864Sbellard port = (uint16_t)li; 5407a5ca864Sbellard break; 5417a5ca864Sbellard case 'o': 5427a5ca864Sbellard dev_offset = strtoll (optarg, &end, 0); 5437a5ca864Sbellard if (*end) { 544b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid offset `%s'", optarg); 5457a5ca864Sbellard } 5467a5ca864Sbellard if (dev_offset < 0) { 547b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Offset must be positive `%s'", optarg); 5487a5ca864Sbellard } 5497a5ca864Sbellard break; 5508c116b0eSWenchao Xia case 'l': 5518c116b0eSWenchao Xia if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) { 55270b94331SMarkus Armbruster sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts, 55370b94331SMarkus Armbruster optarg, false); 5548c116b0eSWenchao Xia if (!sn_opts) { 5558c116b0eSWenchao Xia errx(EXIT_FAILURE, "Failed in parsing snapshot param `%s'", 5568c116b0eSWenchao Xia optarg); 5578c116b0eSWenchao Xia } 5588c116b0eSWenchao Xia } else { 5598c116b0eSWenchao Xia sn_id_or_name = optarg; 5608c116b0eSWenchao Xia } 5618c116b0eSWenchao Xia /* fall through */ 5627a5ca864Sbellard case 'r': 563b90fb4b8SPaolo Bonzini nbdflags |= NBD_FLAG_READ_ONLY; 56407108b29SNaphtali Sprei flags &= ~BDRV_O_RDWR; 5657a5ca864Sbellard break; 5667a5ca864Sbellard case 'P': 5677a5ca864Sbellard partition = strtol(optarg, &end, 0); 568713cc671SPeter Lieven if (*end) { 569b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid partition `%s'", optarg); 570713cc671SPeter Lieven } 571713cc671SPeter Lieven if (partition < 1 || partition > 8) { 572b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid partition %d", partition); 573713cc671SPeter Lieven } 5747a5ca864Sbellard break; 575cd831bd7Sths case 'k': 576b32f6c28SPaolo Bonzini sockpath = optarg; 577713cc671SPeter Lieven if (sockpath[0] != '/') { 578b6353beaSRyota Ozaki errx(EXIT_FAILURE, "socket path must be absolute\n"); 579713cc671SPeter Lieven } 580cd831bd7Sths break; 581cd831bd7Sths case 'd': 582cd831bd7Sths disconnect = true; 583cd831bd7Sths break; 584cd831bd7Sths case 'c': 585cd831bd7Sths device = optarg; 586cd831bd7Sths break; 5873b05a8e9Sths case 'e': 5883b05a8e9Sths shared = strtol(optarg, &end, 0); 5893b05a8e9Sths if (*end) { 590b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid shared device number '%s'", optarg); 5913b05a8e9Sths } 5923b05a8e9Sths if (shared < 1) { 593b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Shared device number must be greater than 0\n"); 5943b05a8e9Sths } 5953b05a8e9Sths break; 596e6b63677SDaniel P. Berrange case 'f': 597e6b63677SDaniel P. Berrange fmt = optarg; 598e6b63677SDaniel P. Berrange break; 59975818250Sths case 't': 60075818250Sths persistent = 1; 60175818250Sths break; 6027a5ca864Sbellard case 'v': 6037a5ca864Sbellard verbose = 1; 6047a5ca864Sbellard break; 6057a5ca864Sbellard case 'V': 6067a5ca864Sbellard version(argv[0]); 6077a5ca864Sbellard exit(0); 6087a5ca864Sbellard break; 6097a5ca864Sbellard case 'h': 6107a5ca864Sbellard usage(argv[0]); 6117a5ca864Sbellard exit(0); 6127a5ca864Sbellard break; 6137a5ca864Sbellard case '?': 614b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Try `%s --help' for more information.", 6157a5ca864Sbellard argv[0]); 6167a5ca864Sbellard } 6177a5ca864Sbellard } 6187a5ca864Sbellard 6197a5ca864Sbellard if ((argc - optind) != 1) { 620b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid number of argument.\n" 6217a5ca864Sbellard "Try `%s --help' for more information.", 6227a5ca864Sbellard argv[0]); 6237a5ca864Sbellard } 6247a5ca864Sbellard 625cd831bd7Sths if (disconnect) { 626cd831bd7Sths fd = open(argv[optind], O_RDWR); 627fc19f8a0SPaolo Bonzini if (fd < 0) { 628cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "Cannot open %s", argv[optind]); 629fc19f8a0SPaolo Bonzini } 630cd831bd7Sths nbd_disconnect(fd); 631cd831bd7Sths 632cd831bd7Sths close(fd); 633cd831bd7Sths 634cd831bd7Sths printf("%s disconnected\n", argv[optind]); 635cd831bd7Sths 636cd831bd7Sths return 0; 637cd831bd7Sths } 638cd831bd7Sths 639c1f8fdc3SPaolo Bonzini if (device && !verbose) { 640c1f8fdc3SPaolo Bonzini int stderr_fd[2]; 641c1f8fdc3SPaolo Bonzini pid_t pid; 642c1f8fdc3SPaolo Bonzini int ret; 643c1f8fdc3SPaolo Bonzini 644fc19f8a0SPaolo Bonzini if (qemu_pipe(stderr_fd) < 0) { 645c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Error setting up communication pipe"); 646c1f8fdc3SPaolo Bonzini } 647c1f8fdc3SPaolo Bonzini 648c1f8fdc3SPaolo Bonzini /* Now daemonize, but keep a communication channel open to 649c1f8fdc3SPaolo Bonzini * print errors and exit with the proper status code. 650c1f8fdc3SPaolo Bonzini */ 651c1f8fdc3SPaolo Bonzini pid = fork(); 65270d4739eSMax Reitz if (pid < 0) { 65370d4739eSMax Reitz err(EXIT_FAILURE, "Failed to fork"); 65470d4739eSMax Reitz } else if (pid == 0) { 655c1f8fdc3SPaolo Bonzini close(stderr_fd[0]); 6569faf31b6SMichael Tokarev ret = qemu_daemon(1, 0); 657c1f8fdc3SPaolo Bonzini 658c1f8fdc3SPaolo Bonzini /* Temporarily redirect stderr to the parent's pipe... */ 659c1f8fdc3SPaolo Bonzini dup2(stderr_fd[1], STDERR_FILENO); 660fc19f8a0SPaolo Bonzini if (ret < 0) { 661c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Failed to daemonize"); 662c1f8fdc3SPaolo Bonzini } 663c1f8fdc3SPaolo Bonzini 664c1f8fdc3SPaolo Bonzini /* ... close the descriptor we inherited and go on. */ 665c1f8fdc3SPaolo Bonzini close(stderr_fd[1]); 666c1f8fdc3SPaolo Bonzini } else { 667c1f8fdc3SPaolo Bonzini bool errors = false; 668c1f8fdc3SPaolo Bonzini char *buf; 669c1f8fdc3SPaolo Bonzini 670c1f8fdc3SPaolo Bonzini /* In the parent. Print error messages from the child until 671c1f8fdc3SPaolo Bonzini * it closes the pipe. 672c1f8fdc3SPaolo Bonzini */ 673c1f8fdc3SPaolo Bonzini close(stderr_fd[1]); 674c1f8fdc3SPaolo Bonzini buf = g_malloc(1024); 675c1f8fdc3SPaolo Bonzini while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { 676c1f8fdc3SPaolo Bonzini errors = true; 677c1f8fdc3SPaolo Bonzini ret = qemu_write_full(STDERR_FILENO, buf, ret); 678fc19f8a0SPaolo Bonzini if (ret < 0) { 679c1f8fdc3SPaolo Bonzini exit(EXIT_FAILURE); 680c1f8fdc3SPaolo Bonzini } 681c1f8fdc3SPaolo Bonzini } 682fc19f8a0SPaolo Bonzini if (ret < 0) { 683c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Cannot read from daemon"); 684c1f8fdc3SPaolo Bonzini } 685c1f8fdc3SPaolo Bonzini 686c1f8fdc3SPaolo Bonzini /* Usually the daemon should not print any message. 687c1f8fdc3SPaolo Bonzini * Exit with zero status in that case. 688c1f8fdc3SPaolo Bonzini */ 689c1f8fdc3SPaolo Bonzini exit(errors); 690c1f8fdc3SPaolo Bonzini } 691c1f8fdc3SPaolo Bonzini } 692c1f8fdc3SPaolo Bonzini 693a6ac2313SPaolo Bonzini if (device != NULL && sockpath == NULL) { 694b32f6c28SPaolo Bonzini sockpath = g_malloc(128); 695b32f6c28SPaolo Bonzini snprintf(sockpath, 128, SOCKET_PATH, basename(device)); 696cd831bd7Sths } 697cd831bd7Sths 6982f78e491SChrysostomos Nanakos if (qemu_init_main_loop(&local_err)) { 699565f65d2SMarkus Armbruster error_report_err(local_err); 7002f78e491SChrysostomos Nanakos exit(EXIT_FAILURE); 7012f78e491SChrysostomos Nanakos } 702802ddc37SPaolo Bonzini bdrv_init(); 703802ddc37SPaolo Bonzini atexit(bdrv_close_all); 704802ddc37SPaolo Bonzini 705e6b63677SDaniel P. Berrange if (fmt) { 7064fbec260SMax Reitz options = qdict_new(); 7074fbec260SMax Reitz qdict_put(options, "driver", qstring_from_str(fmt)); 708e6b63677SDaniel P. Berrange } 70998522f63SKevin Wolf 710802ddc37SPaolo Bonzini srcpath = argv[optind]; 7114fbec260SMax Reitz blk = blk_new_open("hda", srcpath, NULL, options, flags, &local_err); 7124fbec260SMax Reitz if (!blk) { 7134fbec260SMax Reitz errx(EXIT_FAILURE, "Failed to blk_new_open '%s': %s", argv[optind], 71434b5d2c6SMax Reitz error_get_pretty(local_err)); 715802ddc37SPaolo Bonzini } 7164fbec260SMax Reitz bs = blk_bs(blk); 717802ddc37SPaolo Bonzini 7188c116b0eSWenchao Xia if (sn_opts) { 7198c116b0eSWenchao Xia ret = bdrv_snapshot_load_tmp(bs, 7208c116b0eSWenchao Xia qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID), 7218c116b0eSWenchao Xia qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME), 7228c116b0eSWenchao Xia &local_err); 7238c116b0eSWenchao Xia } else if (sn_id_or_name) { 7248c116b0eSWenchao Xia ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name, 7258c116b0eSWenchao Xia &local_err); 7268c116b0eSWenchao Xia } 7278c116b0eSWenchao Xia if (ret < 0) { 7288c116b0eSWenchao Xia errno = -ret; 7298c116b0eSWenchao Xia err(EXIT_FAILURE, 7308c116b0eSWenchao Xia "Failed to load snapshot: %s", 7318c116b0eSWenchao Xia error_get_pretty(local_err)); 7328c116b0eSWenchao Xia } 7338c116b0eSWenchao Xia 734b3838a40SPeter Lieven bs->detect_zeroes = detect_zeroes; 7354c58e80aSMax Reitz fd_size = blk_getlength(blk); 73698f44bbeSMax Reitz if (fd_size < 0) { 73798f44bbeSMax Reitz errx(EXIT_FAILURE, "Failed to determine the image length: %s", 73898f44bbeSMax Reitz strerror(-fd_size)); 73998f44bbeSMax Reitz } 740802ddc37SPaolo Bonzini 741185b4338SPaolo Bonzini if (partition != -1) { 7424c58e80aSMax Reitz ret = find_partition(blk, partition, &dev_offset, &fd_size); 743185b4338SPaolo Bonzini if (ret < 0) { 744185b4338SPaolo Bonzini errno = -ret; 745802ddc37SPaolo Bonzini err(EXIT_FAILURE, "Could not find partition %d", partition); 746802ddc37SPaolo Bonzini } 747185b4338SPaolo Bonzini } 748802ddc37SPaolo Bonzini 74998f44bbeSMax Reitz exp = nbd_export_new(blk, dev_offset, fd_size, nbdflags, nbd_export_closed, 75098f44bbeSMax Reitz &local_err); 75198f44bbeSMax Reitz if (!exp) { 75298f44bbeSMax Reitz errx(EXIT_FAILURE, "%s", error_get_pretty(local_err)); 75398f44bbeSMax Reitz } 7543b05a8e9Sths 755b32f6c28SPaolo Bonzini if (sockpath) { 756a61c6782SPaolo Bonzini fd = unix_socket_incoming(sockpath); 757cd831bd7Sths } else { 758a61c6782SPaolo Bonzini fd = tcp_socket_incoming(bindto, port); 759cd831bd7Sths } 760cd831bd7Sths 761fc19f8a0SPaolo Bonzini if (fd < 0) { 7627a5ca864Sbellard return 1; 763a61c6782SPaolo Bonzini } 764f1ef5555SPaolo Bonzini 765f1ef5555SPaolo Bonzini if (device) { 766f1ef5555SPaolo Bonzini int ret; 767f1ef5555SPaolo Bonzini 768a6ac2313SPaolo Bonzini ret = pthread_create(&client_thread, NULL, nbd_client_thread, device); 769f1ef5555SPaolo Bonzini if (ret != 0) { 770f1ef5555SPaolo Bonzini errx(EXIT_FAILURE, "Failed to create client thread: %s", 771f1ef5555SPaolo Bonzini strerror(ret)); 772f1ef5555SPaolo Bonzini } 773f1ef5555SPaolo Bonzini } else { 774f1ef5555SPaolo Bonzini /* Shut up GCC warnings. */ 775f1ef5555SPaolo Bonzini memset(&client_thread, 0, sizeof(client_thread)); 776f1ef5555SPaolo Bonzini } 777f1ef5555SPaolo Bonzini 778e4afbf4fSFam Zheng server_fd = fd; 779e4afbf4fSFam Zheng nbd_update_server_fd_handler(fd); 7807a5ca864Sbellard 7819faf31b6SMichael Tokarev /* now when the initialization is (almost) complete, chdir("/") 7829faf31b6SMichael Tokarev * to free any busy filesystems */ 7839faf31b6SMichael Tokarev if (chdir("/") < 0) { 7849faf31b6SMichael Tokarev err(EXIT_FAILURE, "Could not chdir to root directory"); 7859faf31b6SMichael Tokarev } 7869faf31b6SMichael Tokarev 7877860a380SPaolo Bonzini state = RUNNING; 7883b05a8e9Sths do { 789a61c6782SPaolo Bonzini main_loop_wait(false); 7907860a380SPaolo Bonzini if (state == TERMINATE) { 7917860a380SPaolo Bonzini state = TERMINATING; 792af49bbbeSPaolo Bonzini nbd_export_close(exp); 7932c8d9f06SPaolo Bonzini nbd_export_put(exp); 7947860a380SPaolo Bonzini exp = NULL; 7957860a380SPaolo Bonzini } 7967860a380SPaolo Bonzini } while (state != TERMINATED); 7972c8d9f06SPaolo Bonzini 79826f54e9aSMarkus Armbruster blk_unref(blk); 799b32f6c28SPaolo Bonzini if (sockpath) { 800b32f6c28SPaolo Bonzini unlink(sockpath); 801b32f6c28SPaolo Bonzini } 8027a5ca864Sbellard 8038c116b0eSWenchao Xia qemu_opts_del(sn_opts); 8048c116b0eSWenchao Xia 805a517e88bSPaolo Bonzini if (device) { 806a517e88bSPaolo Bonzini void *ret; 807a517e88bSPaolo Bonzini pthread_join(client_thread, &ret); 808a517e88bSPaolo Bonzini exit(ret != NULL); 809a517e88bSPaolo Bonzini } else { 810a517e88bSPaolo Bonzini exit(EXIT_SUCCESS); 811a517e88bSPaolo Bonzini } 8127a5ca864Sbellard } 813