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> 33cd831bd7Sths #include <sys/types.h> 347a5ca864Sbellard #include <sys/socket.h> 357a5ca864Sbellard #include <netinet/in.h> 367a5ca864Sbellard #include <netinet/tcp.h> 377a5ca864Sbellard #include <arpa/inet.h> 38cd831bd7Sths #include <signal.h> 392bff4b6fSBlue Swirl #include <libgen.h> 40a517e88bSPaolo Bonzini #include <pthread.h> 41cd831bd7Sths 42cd831bd7Sths #define SOCKET_PATH "/var/lock/qemu-nbd-%s" 4339a5235cSPaolo Bonzini #define QEMU_NBD_OPT_CACHE 1 4439a5235cSPaolo Bonzini #define QEMU_NBD_OPT_AIO 2 45ded9d2d5SPaolo Bonzini #define QEMU_NBD_OPT_DISCARD 3 46b3838a40SPeter Lieven #define QEMU_NBD_OPT_DETECT_ZEROES 4 477a5ca864Sbellard 48af49bbbeSPaolo Bonzini static NBDExport *exp; 49b1d8e52eSblueswir1 static int verbose; 50a517e88bSPaolo Bonzini static char *srcpath; 5148bec07eSDaniel P. Berrange static SocketAddress *saddr; 527860a380SPaolo Bonzini static int persistent = 0; 537860a380SPaolo Bonzini static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state; 54a61c6782SPaolo Bonzini static int shared = 1; 55a61c6782SPaolo Bonzini static int nb_fds; 56e4afbf4fSFam Zheng static int server_fd; 577a5ca864Sbellard 587a5ca864Sbellard static void usage(const char *name) 597a5ca864Sbellard { 60b033cd86SPaolo Bonzini (printf) ( 617a5ca864Sbellard "Usage: %s [OPTIONS] FILE\n" 627a5ca864Sbellard "QEMU Disk Network Block Device Server\n" 637a5ca864Sbellard "\n" 647a5ca864Sbellard " -h, --help display this help and exit\n" 657a5ca864Sbellard " -V, --version output version information and exit\n" 667a5ca864Sbellard "\n" 67b033cd86SPaolo Bonzini "Connection properties:\n" 68b033cd86SPaolo Bonzini " -p, --port=PORT port to listen on (default `%d')\n" 69b033cd86SPaolo Bonzini " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" 70b033cd86SPaolo Bonzini " -k, --socket=PATH path to the unix socket\n" 71b033cd86SPaolo Bonzini " (default '"SOCKET_PATH"')\n" 72b033cd86SPaolo Bonzini " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" 73b033cd86SPaolo Bonzini " -t, --persistent don't exit on the last connection\n" 74b033cd86SPaolo Bonzini " -v, --verbose display extra debugging information\n" 75b033cd86SPaolo Bonzini "\n" 76b033cd86SPaolo Bonzini "Exposing part of the image:\n" 77b033cd86SPaolo Bonzini " -o, --offset=OFFSET offset into the image\n" 78b033cd86SPaolo Bonzini " -P, --partition=NUM only expose partition NUM\n" 79b033cd86SPaolo Bonzini "\n" 80b033cd86SPaolo Bonzini #ifdef __linux__ 81b033cd86SPaolo Bonzini "Kernel NBD client support:\n" 82b033cd86SPaolo Bonzini " -c, --connect=DEV connect FILE to the local NBD device DEV\n" 83b033cd86SPaolo Bonzini " -d, --disconnect disconnect the specified device\n" 84b033cd86SPaolo Bonzini "\n" 85b033cd86SPaolo Bonzini #endif 86b033cd86SPaolo Bonzini "\n" 87b033cd86SPaolo Bonzini "Block device options:\n" 884323fdcfSWenchao Xia " -f, --format=FORMAT set image format (raw, qcow2, ...)\n" 89b033cd86SPaolo Bonzini " -r, --read-only export read-only\n" 908c116b0eSWenchao Xia " -s, --snapshot use FILE as an external snapshot, create a temporary\n" 918c116b0eSWenchao Xia " file with backing_file=FILE, redirect the write to\n" 928c116b0eSWenchao Xia " the temporary one\n" 938c116b0eSWenchao Xia " -l, --load-snapshot=SNAPSHOT_PARAM\n" 948c116b0eSWenchao Xia " load an internal snapshot inside FILE and export it\n" 958c116b0eSWenchao Xia " as an read-only device, SNAPSHOT_PARAM format is\n" 968c116b0eSWenchao Xia " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n" 978c116b0eSWenchao Xia " '[ID_OR_NAME]'\n" 98b033cd86SPaolo Bonzini " -n, --nocache disable host cache\n" 9939a5235cSPaolo Bonzini " --cache=MODE set cache mode (none, writeback, ...)\n" 10039a5235cSPaolo Bonzini " --aio=MODE set AIO mode (native or threads)\n" 101b3838a40SPeter Lieven " --discard=MODE set discard mode (ignore, unmap)\n" 1026883de6cSAndrey Korolyov " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n" 103b033cd86SPaolo Bonzini "\n" 104b033cd86SPaolo Bonzini "Report bugs to <qemu-devel@nongnu.org>\n" 105c2e2872bSLaurent Vivier , name, NBD_DEFAULT_PORT, "DEVICE"); 1067a5ca864Sbellard } 1077a5ca864Sbellard 1087a5ca864Sbellard static void version(const char *name) 1097a5ca864Sbellard { 1107a5ca864Sbellard printf( 111315bc7aaSths "%s version 0.0.1\n" 1127a5ca864Sbellard "Written by Anthony Liguori.\n" 1137a5ca864Sbellard "\n" 1147a5ca864Sbellard "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n" 1157a5ca864Sbellard "This is free software; see the source for copying conditions. There is NO\n" 1167a5ca864Sbellard "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" 117315bc7aaSths , name); 1187a5ca864Sbellard } 1197a5ca864Sbellard 1207a5ca864Sbellard struct partition_record 1217a5ca864Sbellard { 1227a5ca864Sbellard uint8_t bootable; 1237a5ca864Sbellard uint8_t start_head; 1247a5ca864Sbellard uint32_t start_cylinder; 1257a5ca864Sbellard uint8_t start_sector; 1267a5ca864Sbellard uint8_t system; 1277a5ca864Sbellard uint8_t end_head; 1287a5ca864Sbellard uint8_t end_cylinder; 1297a5ca864Sbellard uint8_t end_sector; 1307a5ca864Sbellard uint32_t start_sector_abs; 1317a5ca864Sbellard uint32_t nb_sectors_abs; 1327a5ca864Sbellard }; 1337a5ca864Sbellard 1347a5ca864Sbellard static void read_partition(uint8_t *p, struct partition_record *r) 1357a5ca864Sbellard { 1367a5ca864Sbellard r->bootable = p[0]; 1377a5ca864Sbellard r->start_head = p[1]; 1387a5ca864Sbellard r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); 1397a5ca864Sbellard r->start_sector = p[2] & 0x3f; 1407a5ca864Sbellard r->system = p[4]; 1417a5ca864Sbellard r->end_head = p[5]; 1427a5ca864Sbellard r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); 1437a5ca864Sbellard r->end_sector = p[6] & 0x3f; 144ac97393dSMax Reitz 145ac97393dSMax Reitz r->start_sector_abs = le32_to_cpup((uint32_t *)(p + 8)); 146ac97393dSMax Reitz r->nb_sectors_abs = le32_to_cpup((uint32_t *)(p + 12)); 1477a5ca864Sbellard } 1487a5ca864Sbellard 1494c58e80aSMax Reitz static int find_partition(BlockBackend *blk, int partition, 1507a5ca864Sbellard off_t *offset, off_t *size) 1517a5ca864Sbellard { 1527a5ca864Sbellard struct partition_record mbr[4]; 1537a5ca864Sbellard uint8_t data[512]; 1547a5ca864Sbellard int i; 1557a5ca864Sbellard int ext_partnum = 4; 156cb7cf0e3SRyota Ozaki int ret; 1577a5ca864Sbellard 1584c58e80aSMax Reitz if ((ret = blk_read(blk, 0, data, 1)) < 0) { 159cb7cf0e3SRyota Ozaki errno = -ret; 16085b01e09SMarkus Armbruster error_report("error while reading: %s", strerror(errno)); 16185b01e09SMarkus Armbruster exit(EXIT_FAILURE); 162cb7cf0e3SRyota Ozaki } 1637a5ca864Sbellard 1647a5ca864Sbellard if (data[510] != 0x55 || data[511] != 0xaa) { 165185b4338SPaolo Bonzini return -EINVAL; 1667a5ca864Sbellard } 1677a5ca864Sbellard 1687a5ca864Sbellard for (i = 0; i < 4; i++) { 1697a5ca864Sbellard read_partition(&data[446 + 16 * i], &mbr[i]); 1707a5ca864Sbellard 171453b07b1SMax Reitz if (!mbr[i].system || !mbr[i].nb_sectors_abs) { 1727a5ca864Sbellard continue; 173453b07b1SMax Reitz } 1747a5ca864Sbellard 1757a5ca864Sbellard if (mbr[i].system == 0xF || mbr[i].system == 0x5) { 1767a5ca864Sbellard struct partition_record ext[4]; 1777a5ca864Sbellard uint8_t data1[512]; 1787a5ca864Sbellard int j; 1797a5ca864Sbellard 1804c58e80aSMax Reitz if ((ret = blk_read(blk, mbr[i].start_sector_abs, data1, 1)) < 0) { 181cb7cf0e3SRyota Ozaki errno = -ret; 18285b01e09SMarkus Armbruster error_report("error while reading: %s", strerror(errno)); 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; 238a6ac2313SPaolo Bonzini int fd, sock; 239a517e88bSPaolo Bonzini int ret; 240a517e88bSPaolo Bonzini pthread_t show_parts_thread; 2411ce52846SMax Reitz Error *local_error = NULL; 242a517e88bSPaolo Bonzini 24348bec07eSDaniel P. Berrange 24448bec07eSDaniel P. Berrange sock = socket_connect(saddr, &local_error, NULL, NULL); 245fc19f8a0SPaolo Bonzini if (sock < 0) { 24648bec07eSDaniel P. Berrange error_report_err(local_error); 247a517e88bSPaolo Bonzini goto out; 248a517e88bSPaolo Bonzini } 249a517e88bSPaolo Bonzini 250a517e88bSPaolo Bonzini ret = nbd_receive_negotiate(sock, NULL, &nbdflags, 2513f472659SMax Reitz &size, &local_error); 252fc19f8a0SPaolo Bonzini if (ret < 0) { 2531ce52846SMax Reitz if (local_error) { 254*78288671SMarkus Armbruster error_report_err(local_error); 2551ce52846SMax Reitz } 2560c544d73SPaolo Bonzini goto out_socket; 257a517e88bSPaolo Bonzini } 258a517e88bSPaolo Bonzini 259a6ac2313SPaolo Bonzini fd = open(device, O_RDWR); 260fc19f8a0SPaolo Bonzini if (fd < 0) { 261a6ac2313SPaolo Bonzini /* Linux-only, we can use %m in printf. */ 2625672ee54SHani Benhabiles fprintf(stderr, "Failed to open %s: %m\n", device); 2630c544d73SPaolo Bonzini goto out_socket; 264a6ac2313SPaolo Bonzini } 265a6ac2313SPaolo Bonzini 2663f472659SMax Reitz ret = nbd_init(fd, sock, nbdflags, size); 267fc19f8a0SPaolo Bonzini if (ret < 0) { 2680c544d73SPaolo Bonzini goto out_fd; 269a517e88bSPaolo Bonzini } 270a517e88bSPaolo Bonzini 271a517e88bSPaolo Bonzini /* update partition table */ 272a6ac2313SPaolo Bonzini pthread_create(&show_parts_thread, NULL, show_parts, device); 273a517e88bSPaolo Bonzini 274c1f8fdc3SPaolo Bonzini if (verbose) { 275a517e88bSPaolo Bonzini fprintf(stderr, "NBD device %s is now connected to %s\n", 276a517e88bSPaolo Bonzini device, srcpath); 277c1f8fdc3SPaolo Bonzini } else { 278c1f8fdc3SPaolo Bonzini /* Close stderr so that the qemu-nbd process exits. */ 279c1f8fdc3SPaolo Bonzini dup2(STDOUT_FILENO, STDERR_FILENO); 280c1f8fdc3SPaolo Bonzini } 281a517e88bSPaolo Bonzini 282a517e88bSPaolo Bonzini ret = nbd_client(fd); 283a517e88bSPaolo Bonzini if (ret) { 2840c544d73SPaolo Bonzini goto out_fd; 285a517e88bSPaolo Bonzini } 286a517e88bSPaolo Bonzini close(fd); 287a517e88bSPaolo Bonzini kill(getpid(), SIGTERM); 288a517e88bSPaolo Bonzini return (void *) EXIT_SUCCESS; 289a517e88bSPaolo Bonzini 2900c544d73SPaolo Bonzini out_fd: 2910c544d73SPaolo Bonzini close(fd); 2920c544d73SPaolo Bonzini out_socket: 2930c544d73SPaolo Bonzini closesocket(sock); 294a517e88bSPaolo Bonzini out: 295a517e88bSPaolo Bonzini kill(getpid(), SIGTERM); 296a517e88bSPaolo Bonzini return (void *) EXIT_FAILURE; 297cd831bd7Sths } 298cd831bd7Sths 299e4afbf4fSFam Zheng static int nbd_can_accept(void) 300a61c6782SPaolo Bonzini { 301a61c6782SPaolo Bonzini return nb_fds < shared; 302a61c6782SPaolo Bonzini } 303a61c6782SPaolo Bonzini 3047860a380SPaolo Bonzini static void nbd_export_closed(NBDExport *exp) 3057860a380SPaolo Bonzini { 3067860a380SPaolo Bonzini assert(state == TERMINATING); 3077860a380SPaolo Bonzini state = TERMINATED; 3087860a380SPaolo Bonzini } 3097860a380SPaolo Bonzini 310e4afbf4fSFam Zheng static void nbd_update_server_fd_handler(int fd); 311e4afbf4fSFam Zheng 3121743b515SPaolo Bonzini static void nbd_client_closed(NBDClient *client) 313a61c6782SPaolo Bonzini { 314a61c6782SPaolo Bonzini nb_fds--; 3157860a380SPaolo Bonzini if (nb_fds == 0 && !persistent && state == RUNNING) { 3167860a380SPaolo Bonzini state = TERMINATE; 3177860a380SPaolo Bonzini } 318e4afbf4fSFam Zheng nbd_update_server_fd_handler(server_fd); 3197860a380SPaolo Bonzini nbd_client_put(client); 320a61c6782SPaolo Bonzini } 321a61c6782SPaolo Bonzini 322a61c6782SPaolo Bonzini static void nbd_accept(void *opaque) 323a61c6782SPaolo Bonzini { 324a61c6782SPaolo Bonzini struct sockaddr_in addr; 325a61c6782SPaolo Bonzini socklen_t addr_len = sizeof(addr); 326a61c6782SPaolo Bonzini 327a61c6782SPaolo Bonzini int fd = accept(server_fd, (struct sockaddr *)&addr, &addr_len); 3280c544d73SPaolo Bonzini if (fd < 0) { 3290c544d73SPaolo Bonzini perror("accept"); 3300c544d73SPaolo Bonzini return; 3310c544d73SPaolo Bonzini } 3320c544d73SPaolo Bonzini 3337860a380SPaolo Bonzini if (state >= TERMINATE) { 3347860a380SPaolo Bonzini close(fd); 3357860a380SPaolo Bonzini return; 3367860a380SPaolo Bonzini } 3377860a380SPaolo Bonzini 33836af5994SHani Benhabiles if (nbd_client_new(exp, fd, nbd_client_closed)) { 339a61c6782SPaolo Bonzini nb_fds++; 340e4afbf4fSFam Zheng nbd_update_server_fd_handler(server_fd); 34136af5994SHani Benhabiles } else { 34227e5eae4SHani Benhabiles shutdown(fd, 2); 34336af5994SHani Benhabiles close(fd); 344a61c6782SPaolo Bonzini } 345a61c6782SPaolo Bonzini } 346a61c6782SPaolo Bonzini 347e4afbf4fSFam Zheng static void nbd_update_server_fd_handler(int fd) 348e4afbf4fSFam Zheng { 349e4afbf4fSFam Zheng if (nbd_can_accept()) { 350e4afbf4fSFam Zheng qemu_set_fd_handler(fd, nbd_accept, NULL, (void *)(uintptr_t)fd); 351e4afbf4fSFam Zheng } else { 352e4afbf4fSFam Zheng qemu_set_fd_handler(fd, NULL, NULL, NULL); 353e4afbf4fSFam Zheng } 354e4afbf4fSFam Zheng } 355e4afbf4fSFam Zheng 35648bec07eSDaniel P. Berrange 35748bec07eSDaniel P. Berrange static SocketAddress *nbd_build_socket_address(const char *sockpath, 35848bec07eSDaniel P. Berrange const char *bindto, 35948bec07eSDaniel P. Berrange const char *port) 36048bec07eSDaniel P. Berrange { 36148bec07eSDaniel P. Berrange SocketAddress *saddr; 36248bec07eSDaniel P. Berrange 36348bec07eSDaniel P. Berrange saddr = g_new0(SocketAddress, 1); 36448bec07eSDaniel P. Berrange if (sockpath) { 3652d32addaSEric Blake saddr->type = SOCKET_ADDRESS_KIND_UNIX; 3662d32addaSEric Blake saddr->u.q_unix = g_new0(UnixSocketAddress, 1); 3672d32addaSEric Blake saddr->u.q_unix->path = g_strdup(sockpath); 36848bec07eSDaniel P. Berrange } else { 3692d32addaSEric Blake saddr->type = SOCKET_ADDRESS_KIND_INET; 3702d32addaSEric Blake saddr->u.inet = g_new0(InetSocketAddress, 1); 3712d32addaSEric Blake saddr->u.inet->host = g_strdup(bindto); 37248bec07eSDaniel P. Berrange if (port) { 3732d32addaSEric Blake saddr->u.inet->port = g_strdup(port); 37448bec07eSDaniel P. Berrange } else { 3752d32addaSEric Blake saddr->u.inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT); 37648bec07eSDaniel P. Berrange } 37748bec07eSDaniel P. Berrange } 37848bec07eSDaniel P. Berrange 37948bec07eSDaniel P. Berrange return saddr; 38048bec07eSDaniel P. Berrange } 38148bec07eSDaniel P. Berrange 38248bec07eSDaniel P. Berrange 3837a5ca864Sbellard int main(int argc, char **argv) 3847a5ca864Sbellard { 38526f54e9aSMarkus Armbruster BlockBackend *blk; 3867a5ca864Sbellard BlockDriverState *bs; 3877a5ca864Sbellard off_t dev_offset = 0; 388b90fb4b8SPaolo Bonzini uint32_t nbdflags = 0; 389cd831bd7Sths bool disconnect = false; 3907a5ca864Sbellard const char *bindto = "0.0.0.0"; 39148bec07eSDaniel P. Berrange const char *port = NULL; 39248bec07eSDaniel P. Berrange char *sockpath = NULL; 393a6ac2313SPaolo Bonzini char *device = NULL; 3947a5ca864Sbellard off_t fd_size; 3958c116b0eSWenchao Xia QemuOpts *sn_opts = NULL; 3968c116b0eSWenchao Xia const char *sn_id_or_name = NULL; 3978c116b0eSWenchao Xia const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:"; 3987a5ca864Sbellard struct option lopt[] = { 399660f11beSBlue Swirl { "help", 0, NULL, 'h' }, 400660f11beSBlue Swirl { "version", 0, NULL, 'V' }, 401660f11beSBlue Swirl { "bind", 1, NULL, 'b' }, 402660f11beSBlue Swirl { "port", 1, NULL, 'p' }, 403660f11beSBlue Swirl { "socket", 1, NULL, 'k' }, 404660f11beSBlue Swirl { "offset", 1, NULL, 'o' }, 405660f11beSBlue Swirl { "read-only", 0, NULL, 'r' }, 406660f11beSBlue Swirl { "partition", 1, NULL, 'P' }, 407660f11beSBlue Swirl { "connect", 1, NULL, 'c' }, 408660f11beSBlue Swirl { "disconnect", 0, NULL, 'd' }, 409660f11beSBlue Swirl { "snapshot", 0, NULL, 's' }, 4108c116b0eSWenchao Xia { "load-snapshot", 1, NULL, 'l' }, 411660f11beSBlue Swirl { "nocache", 0, NULL, 'n' }, 41239a5235cSPaolo Bonzini { "cache", 1, NULL, QEMU_NBD_OPT_CACHE }, 41339a5235cSPaolo Bonzini { "aio", 1, NULL, QEMU_NBD_OPT_AIO }, 414ded9d2d5SPaolo Bonzini { "discard", 1, NULL, QEMU_NBD_OPT_DISCARD }, 415b3838a40SPeter Lieven { "detect-zeroes", 1, NULL, QEMU_NBD_OPT_DETECT_ZEROES }, 416660f11beSBlue Swirl { "shared", 1, NULL, 'e' }, 417e6b63677SDaniel P. Berrange { "format", 1, NULL, 'f' }, 418660f11beSBlue Swirl { "persistent", 0, NULL, 't' }, 419660f11beSBlue Swirl { "verbose", 0, NULL, 'v' }, 420660f11beSBlue Swirl { NULL, 0, NULL, 0 } 4217a5ca864Sbellard }; 4227a5ca864Sbellard int ch; 4237a5ca864Sbellard int opt_ind = 0; 4247a5ca864Sbellard char *end; 425f5edb014SNaphtali Sprei int flags = BDRV_O_RDWR; 4267a5ca864Sbellard int partition = -1; 4274fbec260SMax Reitz int ret = 0; 4283b05a8e9Sths int fd; 42939a5235cSPaolo Bonzini bool seen_cache = false; 430ded9d2d5SPaolo Bonzini bool seen_discard = false; 43139a5235cSPaolo Bonzini bool seen_aio = false; 432a517e88bSPaolo Bonzini pthread_t client_thread; 433e6b63677SDaniel P. Berrange const char *fmt = NULL; 43434b5d2c6SMax Reitz Error *local_err = NULL; 435b3838a40SPeter Lieven BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 4364fbec260SMax Reitz QDict *options = NULL; 4377a5ca864Sbellard 438a517e88bSPaolo Bonzini /* The client thread uses SIGTERM to interrupt the server. A signal 439a517e88bSPaolo Bonzini * handler ensures that "qemu-nbd -v -c" exits with a nice status code. 440a517e88bSPaolo Bonzini */ 441bb345110SPaolo Bonzini struct sigaction sa_sigterm; 442bb345110SPaolo Bonzini memset(&sa_sigterm, 0, sizeof(sa_sigterm)); 443bb345110SPaolo Bonzini sa_sigterm.sa_handler = termsig_handler; 444bb345110SPaolo Bonzini sigaction(SIGTERM, &sa_sigterm, NULL); 44510f5bff6SFam Zheng qemu_init_exec_dir(argv[0]); 446bb345110SPaolo Bonzini 4477a5ca864Sbellard while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { 4487a5ca864Sbellard switch (ch) { 4497a5ca864Sbellard case 's': 4502f726488Sths flags |= BDRV_O_SNAPSHOT; 4512f726488Sths break; 4522f726488Sths case 'n': 45339a5235cSPaolo Bonzini optarg = (char *) "none"; 45439a5235cSPaolo Bonzini /* fallthrough */ 45539a5235cSPaolo Bonzini case QEMU_NBD_OPT_CACHE: 45639a5235cSPaolo Bonzini if (seen_cache) { 45785b01e09SMarkus Armbruster error_report("-n and --cache can only be specified once"); 45885b01e09SMarkus Armbruster exit(EXIT_FAILURE); 45939a5235cSPaolo Bonzini } 46039a5235cSPaolo Bonzini seen_cache = true; 46139a5235cSPaolo Bonzini if (bdrv_parse_cache_flags(optarg, &flags) == -1) { 46285b01e09SMarkus Armbruster error_report("Invalid cache mode `%s'", optarg); 46385b01e09SMarkus Armbruster exit(EXIT_FAILURE); 46439a5235cSPaolo Bonzini } 4657a5ca864Sbellard break; 46639a5235cSPaolo Bonzini case QEMU_NBD_OPT_AIO: 46739a5235cSPaolo Bonzini if (seen_aio) { 46885b01e09SMarkus Armbruster error_report("--aio can only be specified once"); 46985b01e09SMarkus Armbruster exit(EXIT_FAILURE); 47039a5235cSPaolo Bonzini } 47139a5235cSPaolo Bonzini seen_aio = true; 47239a5235cSPaolo Bonzini if (!strcmp(optarg, "native")) { 47339a5235cSPaolo Bonzini flags |= BDRV_O_NATIVE_AIO; 47439a5235cSPaolo Bonzini } else if (!strcmp(optarg, "threads")) { 47539a5235cSPaolo Bonzini /* this is the default */ 47639a5235cSPaolo Bonzini } else { 47785b01e09SMarkus Armbruster error_report("invalid aio mode `%s'", optarg); 47885b01e09SMarkus Armbruster exit(EXIT_FAILURE); 47939a5235cSPaolo Bonzini } 48039a5235cSPaolo Bonzini break; 481ded9d2d5SPaolo Bonzini case QEMU_NBD_OPT_DISCARD: 482ded9d2d5SPaolo Bonzini if (seen_discard) { 48385b01e09SMarkus Armbruster error_report("--discard can only be specified once"); 48485b01e09SMarkus Armbruster exit(EXIT_FAILURE); 485ded9d2d5SPaolo Bonzini } 486ded9d2d5SPaolo Bonzini seen_discard = true; 487ded9d2d5SPaolo Bonzini if (bdrv_parse_discard_flags(optarg, &flags) == -1) { 48885b01e09SMarkus Armbruster error_report("Invalid discard mode `%s'", optarg); 48985b01e09SMarkus Armbruster exit(EXIT_FAILURE); 490ded9d2d5SPaolo Bonzini } 491ded9d2d5SPaolo Bonzini break; 492b3838a40SPeter Lieven case QEMU_NBD_OPT_DETECT_ZEROES: 493b3838a40SPeter Lieven detect_zeroes = 494b3838a40SPeter Lieven qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, 495b3838a40SPeter Lieven optarg, 4967fb1cf16SEric Blake BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX, 497b3838a40SPeter Lieven BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 498b3838a40SPeter Lieven &local_err); 499b3838a40SPeter Lieven if (local_err) { 50085b01e09SMarkus Armbruster error_report("Failed to parse detect_zeroes mode: %s", 501b3838a40SPeter Lieven error_get_pretty(local_err)); 50285b01e09SMarkus Armbruster exit(EXIT_FAILURE); 503b3838a40SPeter Lieven } 504b3838a40SPeter Lieven if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 505b3838a40SPeter Lieven !(flags & BDRV_O_UNMAP)) { 50685b01e09SMarkus Armbruster error_report("setting detect-zeroes to unmap is not allowed " 507b3838a40SPeter Lieven "without setting discard operation to unmap"); 50885b01e09SMarkus Armbruster exit(EXIT_FAILURE); 509b3838a40SPeter Lieven } 510b3838a40SPeter Lieven break; 5117a5ca864Sbellard case 'b': 5127a5ca864Sbellard bindto = optarg; 5137a5ca864Sbellard break; 5147a5ca864Sbellard case 'p': 51548bec07eSDaniel P. Berrange port = optarg; 5167a5ca864Sbellard break; 5177a5ca864Sbellard case 'o': 5187a5ca864Sbellard dev_offset = strtoll (optarg, &end, 0); 5197a5ca864Sbellard if (*end) { 52085b01e09SMarkus Armbruster error_report("Invalid offset `%s'", optarg); 52185b01e09SMarkus Armbruster exit(EXIT_FAILURE); 5227a5ca864Sbellard } 5237a5ca864Sbellard if (dev_offset < 0) { 52485b01e09SMarkus Armbruster error_report("Offset must be positive `%s'", optarg); 52585b01e09SMarkus Armbruster exit(EXIT_FAILURE); 5267a5ca864Sbellard } 5277a5ca864Sbellard break; 5288c116b0eSWenchao Xia case 'l': 5298c116b0eSWenchao Xia if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) { 53070b94331SMarkus Armbruster sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts, 53170b94331SMarkus Armbruster optarg, false); 5328c116b0eSWenchao Xia if (!sn_opts) { 53385b01e09SMarkus Armbruster error_report("Failed in parsing snapshot param `%s'", 5348c116b0eSWenchao Xia optarg); 53585b01e09SMarkus Armbruster exit(EXIT_FAILURE); 5368c116b0eSWenchao Xia } 5378c116b0eSWenchao Xia } else { 5388c116b0eSWenchao Xia sn_id_or_name = optarg; 5398c116b0eSWenchao Xia } 5408c116b0eSWenchao Xia /* fall through */ 5417a5ca864Sbellard case 'r': 542b90fb4b8SPaolo Bonzini nbdflags |= NBD_FLAG_READ_ONLY; 54307108b29SNaphtali Sprei flags &= ~BDRV_O_RDWR; 5447a5ca864Sbellard break; 5457a5ca864Sbellard case 'P': 5467a5ca864Sbellard partition = strtol(optarg, &end, 0); 547713cc671SPeter Lieven if (*end) { 54885b01e09SMarkus Armbruster error_report("Invalid partition `%s'", optarg); 54985b01e09SMarkus Armbruster exit(EXIT_FAILURE); 550713cc671SPeter Lieven } 551713cc671SPeter Lieven if (partition < 1 || partition > 8) { 55285b01e09SMarkus Armbruster error_report("Invalid partition %d", partition); 55385b01e09SMarkus Armbruster exit(EXIT_FAILURE); 554713cc671SPeter Lieven } 5557a5ca864Sbellard break; 556cd831bd7Sths case 'k': 557b32f6c28SPaolo Bonzini sockpath = optarg; 558713cc671SPeter Lieven if (sockpath[0] != '/') { 55985b01e09SMarkus Armbruster error_report("socket path must be absolute\n"); 56085b01e09SMarkus Armbruster exit(EXIT_FAILURE); 561713cc671SPeter Lieven } 562cd831bd7Sths break; 563cd831bd7Sths case 'd': 564cd831bd7Sths disconnect = true; 565cd831bd7Sths break; 566cd831bd7Sths case 'c': 567cd831bd7Sths device = optarg; 568cd831bd7Sths break; 5693b05a8e9Sths case 'e': 5703b05a8e9Sths shared = strtol(optarg, &end, 0); 5713b05a8e9Sths if (*end) { 57285b01e09SMarkus Armbruster error_report("Invalid shared device number '%s'", optarg); 57385b01e09SMarkus Armbruster exit(EXIT_FAILURE); 5743b05a8e9Sths } 5753b05a8e9Sths if (shared < 1) { 57685b01e09SMarkus Armbruster error_report("Shared device number must be greater than 0\n"); 57785b01e09SMarkus Armbruster exit(EXIT_FAILURE); 5783b05a8e9Sths } 5793b05a8e9Sths break; 580e6b63677SDaniel P. Berrange case 'f': 581e6b63677SDaniel P. Berrange fmt = optarg; 582e6b63677SDaniel P. Berrange break; 58375818250Sths case 't': 58475818250Sths persistent = 1; 58575818250Sths break; 5867a5ca864Sbellard case 'v': 5877a5ca864Sbellard verbose = 1; 5887a5ca864Sbellard break; 5897a5ca864Sbellard case 'V': 5907a5ca864Sbellard version(argv[0]); 5917a5ca864Sbellard exit(0); 5927a5ca864Sbellard break; 5937a5ca864Sbellard case 'h': 5947a5ca864Sbellard usage(argv[0]); 5957a5ca864Sbellard exit(0); 5967a5ca864Sbellard break; 5977a5ca864Sbellard case '?': 59885b01e09SMarkus Armbruster error_report("Try `%s --help' for more information.", argv[0]); 59985b01e09SMarkus Armbruster exit(EXIT_FAILURE); 6007a5ca864Sbellard } 6017a5ca864Sbellard } 6027a5ca864Sbellard 6037a5ca864Sbellard if ((argc - optind) != 1) { 60485b01e09SMarkus Armbruster error_report("Invalid number of argument.\n" 6057a5ca864Sbellard "Try `%s --help' for more information.", 6067a5ca864Sbellard argv[0]); 60785b01e09SMarkus Armbruster exit(EXIT_FAILURE); 6087a5ca864Sbellard } 6097a5ca864Sbellard 610cd831bd7Sths if (disconnect) { 611cd831bd7Sths fd = open(argv[optind], O_RDWR); 612fc19f8a0SPaolo Bonzini if (fd < 0) { 61385b01e09SMarkus Armbruster error_report("Cannot open %s: %s", argv[optind], 61485b01e09SMarkus Armbruster strerror(errno)); 61585b01e09SMarkus Armbruster exit(EXIT_FAILURE); 616fc19f8a0SPaolo Bonzini } 617cd831bd7Sths nbd_disconnect(fd); 618cd831bd7Sths 619cd831bd7Sths close(fd); 620cd831bd7Sths 621cd831bd7Sths printf("%s disconnected\n", argv[optind]); 622cd831bd7Sths 623cd831bd7Sths return 0; 624cd831bd7Sths } 625cd831bd7Sths 626c1f8fdc3SPaolo Bonzini if (device && !verbose) { 627c1f8fdc3SPaolo Bonzini int stderr_fd[2]; 628c1f8fdc3SPaolo Bonzini pid_t pid; 629c1f8fdc3SPaolo Bonzini int ret; 630c1f8fdc3SPaolo Bonzini 631fc19f8a0SPaolo Bonzini if (qemu_pipe(stderr_fd) < 0) { 63285b01e09SMarkus Armbruster error_report("Error setting up communication pipe: %s", 63385b01e09SMarkus Armbruster strerror(errno)); 63485b01e09SMarkus Armbruster exit(EXIT_FAILURE); 635c1f8fdc3SPaolo Bonzini } 636c1f8fdc3SPaolo Bonzini 637c1f8fdc3SPaolo Bonzini /* Now daemonize, but keep a communication channel open to 638c1f8fdc3SPaolo Bonzini * print errors and exit with the proper status code. 639c1f8fdc3SPaolo Bonzini */ 640c1f8fdc3SPaolo Bonzini pid = fork(); 64170d4739eSMax Reitz if (pid < 0) { 64285b01e09SMarkus Armbruster error_report("Failed to fork: %s", strerror(errno)); 64385b01e09SMarkus Armbruster exit(EXIT_FAILURE); 64470d4739eSMax Reitz } else if (pid == 0) { 645c1f8fdc3SPaolo Bonzini close(stderr_fd[0]); 6469faf31b6SMichael Tokarev ret = qemu_daemon(1, 0); 647c1f8fdc3SPaolo Bonzini 648c1f8fdc3SPaolo Bonzini /* Temporarily redirect stderr to the parent's pipe... */ 649c1f8fdc3SPaolo Bonzini dup2(stderr_fd[1], STDERR_FILENO); 650fc19f8a0SPaolo Bonzini if (ret < 0) { 65185b01e09SMarkus Armbruster error_report("Failed to daemonize: %s", strerror(errno)); 65285b01e09SMarkus Armbruster exit(EXIT_FAILURE); 653c1f8fdc3SPaolo Bonzini } 654c1f8fdc3SPaolo Bonzini 655c1f8fdc3SPaolo Bonzini /* ... close the descriptor we inherited and go on. */ 656c1f8fdc3SPaolo Bonzini close(stderr_fd[1]); 657c1f8fdc3SPaolo Bonzini } else { 658c1f8fdc3SPaolo Bonzini bool errors = false; 659c1f8fdc3SPaolo Bonzini char *buf; 660c1f8fdc3SPaolo Bonzini 661c1f8fdc3SPaolo Bonzini /* In the parent. Print error messages from the child until 662c1f8fdc3SPaolo Bonzini * it closes the pipe. 663c1f8fdc3SPaolo Bonzini */ 664c1f8fdc3SPaolo Bonzini close(stderr_fd[1]); 665c1f8fdc3SPaolo Bonzini buf = g_malloc(1024); 666c1f8fdc3SPaolo Bonzini while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { 667c1f8fdc3SPaolo Bonzini errors = true; 668c1f8fdc3SPaolo Bonzini ret = qemu_write_full(STDERR_FILENO, buf, ret); 669fc19f8a0SPaolo Bonzini if (ret < 0) { 670c1f8fdc3SPaolo Bonzini exit(EXIT_FAILURE); 671c1f8fdc3SPaolo Bonzini } 672c1f8fdc3SPaolo Bonzini } 673fc19f8a0SPaolo Bonzini if (ret < 0) { 67485b01e09SMarkus Armbruster error_report("Cannot read from daemon: %s", 67585b01e09SMarkus Armbruster strerror(errno)); 67685b01e09SMarkus Armbruster exit(EXIT_FAILURE); 677c1f8fdc3SPaolo Bonzini } 678c1f8fdc3SPaolo Bonzini 679c1f8fdc3SPaolo Bonzini /* Usually the daemon should not print any message. 680c1f8fdc3SPaolo Bonzini * Exit with zero status in that case. 681c1f8fdc3SPaolo Bonzini */ 682c1f8fdc3SPaolo Bonzini exit(errors); 683c1f8fdc3SPaolo Bonzini } 684c1f8fdc3SPaolo Bonzini } 685c1f8fdc3SPaolo Bonzini 686a6ac2313SPaolo Bonzini if (device != NULL && sockpath == NULL) { 687b32f6c28SPaolo Bonzini sockpath = g_malloc(128); 688b32f6c28SPaolo Bonzini snprintf(sockpath, 128, SOCKET_PATH, basename(device)); 689cd831bd7Sths } 690cd831bd7Sths 69148bec07eSDaniel P. Berrange saddr = nbd_build_socket_address(sockpath, bindto, port); 69248bec07eSDaniel P. Berrange 6932f78e491SChrysostomos Nanakos if (qemu_init_main_loop(&local_err)) { 694565f65d2SMarkus Armbruster error_report_err(local_err); 6952f78e491SChrysostomos Nanakos exit(EXIT_FAILURE); 6962f78e491SChrysostomos Nanakos } 697802ddc37SPaolo Bonzini bdrv_init(); 698802ddc37SPaolo Bonzini atexit(bdrv_close_all); 699802ddc37SPaolo Bonzini 700e6b63677SDaniel P. Berrange if (fmt) { 7014fbec260SMax Reitz options = qdict_new(); 7024fbec260SMax Reitz qdict_put(options, "driver", qstring_from_str(fmt)); 703e6b63677SDaniel P. Berrange } 70498522f63SKevin Wolf 705802ddc37SPaolo Bonzini srcpath = argv[optind]; 7064fbec260SMax Reitz blk = blk_new_open("hda", srcpath, NULL, options, flags, &local_err); 7074fbec260SMax Reitz if (!blk) { 70885b01e09SMarkus Armbruster error_report("Failed to blk_new_open '%s': %s", argv[optind], 70934b5d2c6SMax Reitz error_get_pretty(local_err)); 71085b01e09SMarkus Armbruster exit(EXIT_FAILURE); 711802ddc37SPaolo Bonzini } 7124fbec260SMax Reitz bs = blk_bs(blk); 713802ddc37SPaolo Bonzini 7148c116b0eSWenchao Xia if (sn_opts) { 7158c116b0eSWenchao Xia ret = bdrv_snapshot_load_tmp(bs, 7168c116b0eSWenchao Xia qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID), 7178c116b0eSWenchao Xia qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME), 7188c116b0eSWenchao Xia &local_err); 7198c116b0eSWenchao Xia } else if (sn_id_or_name) { 7208c116b0eSWenchao Xia ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name, 7218c116b0eSWenchao Xia &local_err); 7228c116b0eSWenchao Xia } 7238c116b0eSWenchao Xia if (ret < 0) { 7248c116b0eSWenchao Xia errno = -ret; 72585b01e09SMarkus Armbruster error_report("Failed to load snapshot: %s: %s", 72685b01e09SMarkus Armbruster error_get_pretty(local_err), strerror(errno)); 72785b01e09SMarkus Armbruster exit(EXIT_FAILURE); 7288c116b0eSWenchao Xia } 7298c116b0eSWenchao Xia 730b3838a40SPeter Lieven bs->detect_zeroes = detect_zeroes; 7314c58e80aSMax Reitz fd_size = blk_getlength(blk); 73298f44bbeSMax Reitz if (fd_size < 0) { 73385b01e09SMarkus Armbruster error_report("Failed to determine the image length: %s", 73498f44bbeSMax Reitz strerror(-fd_size)); 73585b01e09SMarkus Armbruster exit(EXIT_FAILURE); 73698f44bbeSMax Reitz } 737802ddc37SPaolo Bonzini 738185b4338SPaolo Bonzini if (partition != -1) { 7394c58e80aSMax Reitz ret = find_partition(blk, partition, &dev_offset, &fd_size); 740185b4338SPaolo Bonzini if (ret < 0) { 741185b4338SPaolo Bonzini errno = -ret; 74285b01e09SMarkus Armbruster error_report("Could not find partition %d: %s", partition, 74385b01e09SMarkus Armbruster strerror(errno)); 74485b01e09SMarkus Armbruster exit(EXIT_FAILURE); 745802ddc37SPaolo Bonzini } 746185b4338SPaolo Bonzini } 747802ddc37SPaolo Bonzini 74898f44bbeSMax Reitz exp = nbd_export_new(blk, dev_offset, fd_size, nbdflags, nbd_export_closed, 74998f44bbeSMax Reitz &local_err); 75098f44bbeSMax Reitz if (!exp) { 7514fffeb5eSMarkus Armbruster error_report_err(local_err); 75285b01e09SMarkus Armbruster exit(EXIT_FAILURE); 75398f44bbeSMax Reitz } 7543b05a8e9Sths 75548bec07eSDaniel P. Berrange fd = socket_listen(saddr, &local_err); 756fc19f8a0SPaolo Bonzini if (fd < 0) { 75748bec07eSDaniel P. Berrange error_report_err(local_err); 7587a5ca864Sbellard return 1; 759a61c6782SPaolo Bonzini } 760f1ef5555SPaolo Bonzini 761f1ef5555SPaolo Bonzini if (device) { 762f1ef5555SPaolo Bonzini int ret; 763f1ef5555SPaolo Bonzini 764a6ac2313SPaolo Bonzini ret = pthread_create(&client_thread, NULL, nbd_client_thread, device); 765f1ef5555SPaolo Bonzini if (ret != 0) { 76685b01e09SMarkus Armbruster error_report("Failed to create client thread: %s", strerror(ret)); 76785b01e09SMarkus Armbruster exit(EXIT_FAILURE); 768f1ef5555SPaolo Bonzini } 769f1ef5555SPaolo Bonzini } else { 770f1ef5555SPaolo Bonzini /* Shut up GCC warnings. */ 771f1ef5555SPaolo Bonzini memset(&client_thread, 0, sizeof(client_thread)); 772f1ef5555SPaolo Bonzini } 773f1ef5555SPaolo Bonzini 774e4afbf4fSFam Zheng server_fd = fd; 775e4afbf4fSFam Zheng nbd_update_server_fd_handler(fd); 7767a5ca864Sbellard 7779faf31b6SMichael Tokarev /* now when the initialization is (almost) complete, chdir("/") 7789faf31b6SMichael Tokarev * to free any busy filesystems */ 7799faf31b6SMichael Tokarev if (chdir("/") < 0) { 78085b01e09SMarkus Armbruster error_report("Could not chdir to root directory: %s", 78185b01e09SMarkus Armbruster strerror(errno)); 78285b01e09SMarkus Armbruster exit(EXIT_FAILURE); 7839faf31b6SMichael Tokarev } 7849faf31b6SMichael Tokarev 7857860a380SPaolo Bonzini state = RUNNING; 7863b05a8e9Sths do { 787a61c6782SPaolo Bonzini main_loop_wait(false); 7887860a380SPaolo Bonzini if (state == TERMINATE) { 7897860a380SPaolo Bonzini state = TERMINATING; 790af49bbbeSPaolo Bonzini nbd_export_close(exp); 7912c8d9f06SPaolo Bonzini nbd_export_put(exp); 7927860a380SPaolo Bonzini exp = NULL; 7937860a380SPaolo Bonzini } 7947860a380SPaolo Bonzini } while (state != TERMINATED); 7952c8d9f06SPaolo Bonzini 79626f54e9aSMarkus Armbruster blk_unref(blk); 797b32f6c28SPaolo Bonzini if (sockpath) { 798b32f6c28SPaolo Bonzini unlink(sockpath); 799b32f6c28SPaolo Bonzini } 8007a5ca864Sbellard 8018c116b0eSWenchao Xia qemu_opts_del(sn_opts); 8028c116b0eSWenchao Xia 803a517e88bSPaolo Bonzini if (device) { 804a517e88bSPaolo Bonzini void *ret; 805a517e88bSPaolo Bonzini pthread_join(client_thread, &ret); 806a517e88bSPaolo Bonzini exit(ret != NULL); 807a517e88bSPaolo Bonzini } else { 808a517e88bSPaolo Bonzini exit(EXIT_SUCCESS); 809a517e88bSPaolo Bonzini } 8107a5ca864Sbellard } 811