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" 207a5ca864Sbellard #include "block_int.h" 217a5ca864Sbellard #include "nbd.h" 227a5ca864Sbellard 237a5ca864Sbellard #include <stdarg.h> 247a5ca864Sbellard #include <stdio.h> 257a5ca864Sbellard #include <getopt.h> 267a5ca864Sbellard #include <err.h> 27cd831bd7Sths #include <sys/types.h> 287a5ca864Sbellard #include <sys/socket.h> 297a5ca864Sbellard #include <netinet/in.h> 307a5ca864Sbellard #include <netinet/tcp.h> 317a5ca864Sbellard #include <arpa/inet.h> 32cd831bd7Sths #include <signal.h> 332bff4b6fSBlue Swirl #include <libgen.h> 34a517e88bSPaolo Bonzini #include <pthread.h> 35cd831bd7Sths 36cd831bd7Sths #define SOCKET_PATH "/var/lock/qemu-nbd-%s" 377a5ca864Sbellard 38af49bbbeSPaolo Bonzini static NBDExport *exp; 39b1d8e52eSblueswir1 static int verbose; 40a517e88bSPaolo Bonzini static char *device; 41a517e88bSPaolo Bonzini static char *srcpath; 42a517e88bSPaolo Bonzini static char *sockpath; 43a61c6782SPaolo Bonzini static bool sigterm_reported; 44a61c6782SPaolo Bonzini static bool nbd_started; 45a61c6782SPaolo Bonzini static int shared = 1; 46a61c6782SPaolo Bonzini static int nb_fds; 477a5ca864Sbellard 487a5ca864Sbellard static void usage(const char *name) 497a5ca864Sbellard { 507a5ca864Sbellard printf( 517a5ca864Sbellard "Usage: %s [OPTIONS] FILE\n" 527a5ca864Sbellard "QEMU Disk Network Block Device Server\n" 537a5ca864Sbellard "\n" 54c2e2872bSLaurent Vivier " -p, --port=PORT port to listen on (default `%d')\n" 557a5ca864Sbellard " -o, --offset=OFFSET offset into the image\n" 567a5ca864Sbellard " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" 57cd831bd7Sths " -k, --socket=PATH path to the unix socket\n" 58cd831bd7Sths " (default '"SOCKET_PATH"')\n" 597a5ca864Sbellard " -r, --read-only export read-only\n" 607a5ca864Sbellard " -P, --partition=NUM only expose partition NUM\n" 612f726488Sths " -s, --snapshot use snapshot file\n" 622f726488Sths " -n, --nocache disable host cache\n" 63cd831bd7Sths " -c, --connect=DEV connect FILE to the local NBD device DEV\n" 64cd831bd7Sths " -d, --disconnect disconnect the specified device\n" 653b05a8e9Sths " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" 6675818250Sths " -t, --persistent don't exit on the last connection\n" 677a5ca864Sbellard " -v, --verbose display extra debugging information\n" 687a5ca864Sbellard " -h, --help display this help and exit\n" 697a5ca864Sbellard " -V, --version output version information and exit\n" 707a5ca864Sbellard "\n" 717a5ca864Sbellard "Report bugs to <anthony@codemonkey.ws>\n" 72c2e2872bSLaurent Vivier , name, NBD_DEFAULT_PORT, "DEVICE"); 737a5ca864Sbellard } 747a5ca864Sbellard 757a5ca864Sbellard static void version(const char *name) 767a5ca864Sbellard { 777a5ca864Sbellard printf( 78315bc7aaSths "%s version 0.0.1\n" 797a5ca864Sbellard "Written by Anthony Liguori.\n" 807a5ca864Sbellard "\n" 817a5ca864Sbellard "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n" 827a5ca864Sbellard "This is free software; see the source for copying conditions. There is NO\n" 837a5ca864Sbellard "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" 84315bc7aaSths , name); 857a5ca864Sbellard } 867a5ca864Sbellard 877a5ca864Sbellard struct partition_record 887a5ca864Sbellard { 897a5ca864Sbellard uint8_t bootable; 907a5ca864Sbellard uint8_t start_head; 917a5ca864Sbellard uint32_t start_cylinder; 927a5ca864Sbellard uint8_t start_sector; 937a5ca864Sbellard uint8_t system; 947a5ca864Sbellard uint8_t end_head; 957a5ca864Sbellard uint8_t end_cylinder; 967a5ca864Sbellard uint8_t end_sector; 977a5ca864Sbellard uint32_t start_sector_abs; 987a5ca864Sbellard uint32_t nb_sectors_abs; 997a5ca864Sbellard }; 1007a5ca864Sbellard 1017a5ca864Sbellard static void read_partition(uint8_t *p, struct partition_record *r) 1027a5ca864Sbellard { 1037a5ca864Sbellard r->bootable = p[0]; 1047a5ca864Sbellard r->start_head = p[1]; 1057a5ca864Sbellard r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); 1067a5ca864Sbellard r->start_sector = p[2] & 0x3f; 1077a5ca864Sbellard r->system = p[4]; 1087a5ca864Sbellard r->end_head = p[5]; 1097a5ca864Sbellard r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); 1107a5ca864Sbellard r->end_sector = p[6] & 0x3f; 1117a5ca864Sbellard r->start_sector_abs = p[8] | p[9] << 8 | p[10] << 16 | p[11] << 24; 1127a5ca864Sbellard r->nb_sectors_abs = p[12] | p[13] << 8 | p[14] << 16 | p[15] << 24; 1137a5ca864Sbellard } 1147a5ca864Sbellard 1157a5ca864Sbellard static int find_partition(BlockDriverState *bs, int partition, 1167a5ca864Sbellard off_t *offset, off_t *size) 1177a5ca864Sbellard { 1187a5ca864Sbellard struct partition_record mbr[4]; 1197a5ca864Sbellard uint8_t data[512]; 1207a5ca864Sbellard int i; 1217a5ca864Sbellard int ext_partnum = 4; 122cb7cf0e3SRyota Ozaki int ret; 1237a5ca864Sbellard 124cb7cf0e3SRyota Ozaki if ((ret = bdrv_read(bs, 0, data, 1)) < 0) { 125cb7cf0e3SRyota Ozaki errno = -ret; 126cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "error while reading"); 127cb7cf0e3SRyota Ozaki } 1287a5ca864Sbellard 1297a5ca864Sbellard if (data[510] != 0x55 || data[511] != 0xaa) { 1307a5ca864Sbellard errno = -EINVAL; 1317a5ca864Sbellard return -1; 1327a5ca864Sbellard } 1337a5ca864Sbellard 1347a5ca864Sbellard for (i = 0; i < 4; i++) { 1357a5ca864Sbellard read_partition(&data[446 + 16 * i], &mbr[i]); 1367a5ca864Sbellard 1377a5ca864Sbellard if (!mbr[i].nb_sectors_abs) 1387a5ca864Sbellard continue; 1397a5ca864Sbellard 1407a5ca864Sbellard if (mbr[i].system == 0xF || mbr[i].system == 0x5) { 1417a5ca864Sbellard struct partition_record ext[4]; 1427a5ca864Sbellard uint8_t data1[512]; 1437a5ca864Sbellard int j; 1447a5ca864Sbellard 145cb7cf0e3SRyota Ozaki if ((ret = bdrv_read(bs, mbr[i].start_sector_abs, data1, 1)) < 0) { 146cb7cf0e3SRyota Ozaki errno = -ret; 147cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "error while reading"); 148cb7cf0e3SRyota Ozaki } 1497a5ca864Sbellard 1507a5ca864Sbellard for (j = 0; j < 4; j++) { 1517a5ca864Sbellard read_partition(&data1[446 + 16 * j], &ext[j]); 1527a5ca864Sbellard if (!ext[j].nb_sectors_abs) 1537a5ca864Sbellard continue; 1547a5ca864Sbellard 1557a5ca864Sbellard if ((ext_partnum + j + 1) == partition) { 1567a5ca864Sbellard *offset = (uint64_t)ext[j].start_sector_abs << 9; 1577a5ca864Sbellard *size = (uint64_t)ext[j].nb_sectors_abs << 9; 1587a5ca864Sbellard return 0; 1597a5ca864Sbellard } 1607a5ca864Sbellard } 1617a5ca864Sbellard ext_partnum += 4; 1627a5ca864Sbellard } else if ((i + 1) == partition) { 1637a5ca864Sbellard *offset = (uint64_t)mbr[i].start_sector_abs << 9; 1647a5ca864Sbellard *size = (uint64_t)mbr[i].nb_sectors_abs << 9; 1657a5ca864Sbellard return 0; 1667a5ca864Sbellard } 1677a5ca864Sbellard } 1687a5ca864Sbellard 1697a5ca864Sbellard errno = -ENOENT; 1707a5ca864Sbellard return -1; 1717a5ca864Sbellard } 1727a5ca864Sbellard 173bb345110SPaolo Bonzini static void termsig_handler(int signum) 174bb345110SPaolo Bonzini { 175a61c6782SPaolo Bonzini sigterm_reported = true; 176a61c6782SPaolo Bonzini qemu_notify_event(); 177bb345110SPaolo Bonzini } 178bb345110SPaolo Bonzini 179a517e88bSPaolo Bonzini static void *show_parts(void *arg) 180cd831bd7Sths { 181cd831bd7Sths int nbd; 182cd831bd7Sths 183cd831bd7Sths /* linux just needs an open() to trigger 184cd831bd7Sths * the partition table update 185cd831bd7Sths * but remember to load the module with max_part != 0 : 186cd831bd7Sths * modprobe nbd max_part=63 187cd831bd7Sths */ 188cd831bd7Sths nbd = open(device, O_RDWR); 189a517e88bSPaolo Bonzini if (nbd != -1) { 190cd831bd7Sths close(nbd); 191cd831bd7Sths } 192a517e88bSPaolo Bonzini return NULL; 193a517e88bSPaolo Bonzini } 194a517e88bSPaolo Bonzini 195a517e88bSPaolo Bonzini static void *nbd_client_thread(void *arg) 196a517e88bSPaolo Bonzini { 197a517e88bSPaolo Bonzini int fd = *(int *)arg; 198a517e88bSPaolo Bonzini off_t size; 199a517e88bSPaolo Bonzini size_t blocksize; 200a517e88bSPaolo Bonzini uint32_t nbdflags; 201a517e88bSPaolo Bonzini int sock; 202a517e88bSPaolo Bonzini int ret; 203a517e88bSPaolo Bonzini pthread_t show_parts_thread; 204a517e88bSPaolo Bonzini 205a517e88bSPaolo Bonzini sock = unix_socket_outgoing(sockpath); 206a517e88bSPaolo Bonzini if (sock == -1) { 207a517e88bSPaolo Bonzini goto out; 208a517e88bSPaolo Bonzini } 209a517e88bSPaolo Bonzini 210a517e88bSPaolo Bonzini ret = nbd_receive_negotiate(sock, NULL, &nbdflags, 211a517e88bSPaolo Bonzini &size, &blocksize); 212a517e88bSPaolo Bonzini if (ret == -1) { 213a517e88bSPaolo Bonzini goto out; 214a517e88bSPaolo Bonzini } 215a517e88bSPaolo Bonzini 216a517e88bSPaolo Bonzini ret = nbd_init(fd, sock, nbdflags, size, blocksize); 217a517e88bSPaolo Bonzini if (ret == -1) { 218a517e88bSPaolo Bonzini goto out; 219a517e88bSPaolo Bonzini } 220a517e88bSPaolo Bonzini 221a517e88bSPaolo Bonzini /* update partition table */ 222a517e88bSPaolo Bonzini pthread_create(&show_parts_thread, NULL, show_parts, NULL); 223a517e88bSPaolo Bonzini 224c1f8fdc3SPaolo Bonzini if (verbose) { 225a517e88bSPaolo Bonzini fprintf(stderr, "NBD device %s is now connected to %s\n", 226a517e88bSPaolo Bonzini device, srcpath); 227c1f8fdc3SPaolo Bonzini } else { 228c1f8fdc3SPaolo Bonzini /* Close stderr so that the qemu-nbd process exits. */ 229c1f8fdc3SPaolo Bonzini dup2(STDOUT_FILENO, STDERR_FILENO); 230c1f8fdc3SPaolo Bonzini } 231a517e88bSPaolo Bonzini 232a517e88bSPaolo Bonzini ret = nbd_client(fd); 233a517e88bSPaolo Bonzini if (ret) { 234a517e88bSPaolo Bonzini goto out; 235a517e88bSPaolo Bonzini } 236a517e88bSPaolo Bonzini close(fd); 237a517e88bSPaolo Bonzini kill(getpid(), SIGTERM); 238a517e88bSPaolo Bonzini return (void *) EXIT_SUCCESS; 239a517e88bSPaolo Bonzini 240a517e88bSPaolo Bonzini out: 241a517e88bSPaolo Bonzini kill(getpid(), SIGTERM); 242a517e88bSPaolo Bonzini return (void *) EXIT_FAILURE; 243cd831bd7Sths } 244cd831bd7Sths 245a61c6782SPaolo Bonzini static int nbd_can_accept(void *opaque) 246a61c6782SPaolo Bonzini { 247a61c6782SPaolo Bonzini return nb_fds < shared; 248a61c6782SPaolo Bonzini } 249a61c6782SPaolo Bonzini 2501743b515SPaolo Bonzini static void nbd_client_closed(NBDClient *client) 251a61c6782SPaolo Bonzini { 252a61c6782SPaolo Bonzini nb_fds--; 2531743b515SPaolo Bonzini qemu_notify_event(); 254a61c6782SPaolo Bonzini } 255a61c6782SPaolo Bonzini 256a61c6782SPaolo Bonzini static void nbd_accept(void *opaque) 257a61c6782SPaolo Bonzini { 258a61c6782SPaolo Bonzini int server_fd = (uintptr_t) opaque; 259a61c6782SPaolo Bonzini struct sockaddr_in addr; 260a61c6782SPaolo Bonzini socklen_t addr_len = sizeof(addr); 261a61c6782SPaolo Bonzini 262a61c6782SPaolo Bonzini int fd = accept(server_fd, (struct sockaddr *)&addr, &addr_len); 263a61c6782SPaolo Bonzini nbd_started = true; 2641743b515SPaolo Bonzini if (fd != -1 && nbd_client_new(exp, fd, nbd_client_closed)) { 265a61c6782SPaolo Bonzini nb_fds++; 266a61c6782SPaolo Bonzini } 267a61c6782SPaolo Bonzini } 268a61c6782SPaolo Bonzini 2697a5ca864Sbellard int main(int argc, char **argv) 2707a5ca864Sbellard { 2717a5ca864Sbellard BlockDriverState *bs; 2727a5ca864Sbellard off_t dev_offset = 0; 273b90fb4b8SPaolo Bonzini uint32_t nbdflags = 0; 274cd831bd7Sths bool disconnect = false; 2757a5ca864Sbellard const char *bindto = "0.0.0.0"; 276c2e2872bSLaurent Vivier int port = NBD_DEFAULT_PORT; 2777a5ca864Sbellard off_t fd_size; 278d6aa671fSaliguori const char *sopt = "hVb:o:p:rsnP:c:dvk:e:t"; 2797a5ca864Sbellard struct option lopt[] = { 280660f11beSBlue Swirl { "help", 0, NULL, 'h' }, 281660f11beSBlue Swirl { "version", 0, NULL, 'V' }, 282660f11beSBlue Swirl { "bind", 1, NULL, 'b' }, 283660f11beSBlue Swirl { "port", 1, NULL, 'p' }, 284660f11beSBlue Swirl { "socket", 1, NULL, 'k' }, 285660f11beSBlue Swirl { "offset", 1, NULL, 'o' }, 286660f11beSBlue Swirl { "read-only", 0, NULL, 'r' }, 287660f11beSBlue Swirl { "partition", 1, NULL, 'P' }, 288660f11beSBlue Swirl { "connect", 1, NULL, 'c' }, 289660f11beSBlue Swirl { "disconnect", 0, NULL, 'd' }, 290660f11beSBlue Swirl { "snapshot", 0, NULL, 's' }, 291660f11beSBlue Swirl { "nocache", 0, NULL, 'n' }, 292660f11beSBlue Swirl { "shared", 1, NULL, 'e' }, 293660f11beSBlue Swirl { "persistent", 0, NULL, 't' }, 294660f11beSBlue Swirl { "verbose", 0, NULL, 'v' }, 295660f11beSBlue Swirl { NULL, 0, NULL, 0 } 2967a5ca864Sbellard }; 2977a5ca864Sbellard int ch; 2987a5ca864Sbellard int opt_ind = 0; 2997a5ca864Sbellard int li; 3007a5ca864Sbellard char *end; 301f5edb014SNaphtali Sprei int flags = BDRV_O_RDWR; 3027a5ca864Sbellard int partition = -1; 303cd831bd7Sths int ret; 3043b05a8e9Sths int fd; 30575818250Sths int persistent = 0; 306a517e88bSPaolo Bonzini pthread_t client_thread; 3077a5ca864Sbellard 308a517e88bSPaolo Bonzini /* The client thread uses SIGTERM to interrupt the server. A signal 309a517e88bSPaolo Bonzini * handler ensures that "qemu-nbd -v -c" exits with a nice status code. 310a517e88bSPaolo Bonzini */ 311bb345110SPaolo Bonzini struct sigaction sa_sigterm; 312bb345110SPaolo Bonzini memset(&sa_sigterm, 0, sizeof(sa_sigterm)); 313bb345110SPaolo Bonzini sa_sigterm.sa_handler = termsig_handler; 314bb345110SPaolo Bonzini sigaction(SIGTERM, &sa_sigterm, NULL); 315bb345110SPaolo Bonzini 3167a5ca864Sbellard while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { 3177a5ca864Sbellard switch (ch) { 3187a5ca864Sbellard case 's': 3192f726488Sths flags |= BDRV_O_SNAPSHOT; 3202f726488Sths break; 3212f726488Sths case 'n': 322a6599793SChristoph Hellwig flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; 3237a5ca864Sbellard break; 3247a5ca864Sbellard case 'b': 3257a5ca864Sbellard bindto = optarg; 3267a5ca864Sbellard break; 3277a5ca864Sbellard case 'p': 3287a5ca864Sbellard li = strtol(optarg, &end, 0); 3297a5ca864Sbellard if (*end) { 330b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid port `%s'", optarg); 3317a5ca864Sbellard } 3327a5ca864Sbellard if (li < 1 || li > 65535) { 333b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Port out of range `%s'", optarg); 3347a5ca864Sbellard } 3357a5ca864Sbellard port = (uint16_t)li; 3367a5ca864Sbellard break; 3377a5ca864Sbellard case 'o': 3387a5ca864Sbellard dev_offset = strtoll (optarg, &end, 0); 3397a5ca864Sbellard if (*end) { 340b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid offset `%s'", optarg); 3417a5ca864Sbellard } 3427a5ca864Sbellard if (dev_offset < 0) { 343b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Offset must be positive `%s'", optarg); 3447a5ca864Sbellard } 3457a5ca864Sbellard break; 3467a5ca864Sbellard case 'r': 347b90fb4b8SPaolo Bonzini nbdflags |= NBD_FLAG_READ_ONLY; 34807108b29SNaphtali Sprei flags &= ~BDRV_O_RDWR; 3497a5ca864Sbellard break; 3507a5ca864Sbellard case 'P': 3517a5ca864Sbellard partition = strtol(optarg, &end, 0); 3527a5ca864Sbellard if (*end) 353b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid partition `%s'", optarg); 3547a5ca864Sbellard if (partition < 1 || partition > 8) 355b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid partition %d", partition); 3567a5ca864Sbellard break; 357cd831bd7Sths case 'k': 358b32f6c28SPaolo Bonzini sockpath = optarg; 359b32f6c28SPaolo Bonzini if (sockpath[0] != '/') 360b6353beaSRyota Ozaki errx(EXIT_FAILURE, "socket path must be absolute\n"); 361cd831bd7Sths break; 362cd831bd7Sths case 'd': 363cd831bd7Sths disconnect = true; 364cd831bd7Sths break; 365cd831bd7Sths case 'c': 366cd831bd7Sths device = optarg; 367cd831bd7Sths break; 3683b05a8e9Sths case 'e': 3693b05a8e9Sths shared = strtol(optarg, &end, 0); 3703b05a8e9Sths if (*end) { 371b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid shared device number '%s'", optarg); 3723b05a8e9Sths } 3733b05a8e9Sths if (shared < 1) { 374b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Shared device number must be greater than 0\n"); 3753b05a8e9Sths } 3763b05a8e9Sths break; 37775818250Sths case 't': 37875818250Sths persistent = 1; 37975818250Sths break; 3807a5ca864Sbellard case 'v': 3817a5ca864Sbellard verbose = 1; 3827a5ca864Sbellard break; 3837a5ca864Sbellard case 'V': 3847a5ca864Sbellard version(argv[0]); 3857a5ca864Sbellard exit(0); 3867a5ca864Sbellard break; 3877a5ca864Sbellard case 'h': 3887a5ca864Sbellard usage(argv[0]); 3897a5ca864Sbellard exit(0); 3907a5ca864Sbellard break; 3917a5ca864Sbellard case '?': 392b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Try `%s --help' for more information.", 3937a5ca864Sbellard argv[0]); 3947a5ca864Sbellard } 3957a5ca864Sbellard } 3967a5ca864Sbellard 3977a5ca864Sbellard if ((argc - optind) != 1) { 398b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid number of argument.\n" 3997a5ca864Sbellard "Try `%s --help' for more information.", 4007a5ca864Sbellard argv[0]); 4017a5ca864Sbellard } 4027a5ca864Sbellard 403cd831bd7Sths if (disconnect) { 404cd831bd7Sths fd = open(argv[optind], O_RDWR); 405cd831bd7Sths if (fd == -1) 406cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "Cannot open %s", argv[optind]); 407cd831bd7Sths 408cd831bd7Sths nbd_disconnect(fd); 409cd831bd7Sths 410cd831bd7Sths close(fd); 411cd831bd7Sths 412cd831bd7Sths printf("%s disconnected\n", argv[optind]); 413cd831bd7Sths 414cd831bd7Sths return 0; 415cd831bd7Sths } 416cd831bd7Sths 417c1f8fdc3SPaolo Bonzini if (device && !verbose) { 418c1f8fdc3SPaolo Bonzini int stderr_fd[2]; 419c1f8fdc3SPaolo Bonzini pid_t pid; 420c1f8fdc3SPaolo Bonzini int ret; 421c1f8fdc3SPaolo Bonzini 422c1f8fdc3SPaolo Bonzini if (qemu_pipe(stderr_fd) == -1) { 423c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Error setting up communication pipe"); 424c1f8fdc3SPaolo Bonzini } 425c1f8fdc3SPaolo Bonzini 426c1f8fdc3SPaolo Bonzini /* Now daemonize, but keep a communication channel open to 427c1f8fdc3SPaolo Bonzini * print errors and exit with the proper status code. 428c1f8fdc3SPaolo Bonzini */ 429c1f8fdc3SPaolo Bonzini pid = fork(); 430c1f8fdc3SPaolo Bonzini if (pid == 0) { 431c1f8fdc3SPaolo Bonzini close(stderr_fd[0]); 432*9faf31b6SMichael Tokarev ret = qemu_daemon(1, 0); 433c1f8fdc3SPaolo Bonzini 434c1f8fdc3SPaolo Bonzini /* Temporarily redirect stderr to the parent's pipe... */ 435c1f8fdc3SPaolo Bonzini dup2(stderr_fd[1], STDERR_FILENO); 436c1f8fdc3SPaolo Bonzini if (ret == -1) { 437c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Failed to daemonize"); 438c1f8fdc3SPaolo Bonzini } 439c1f8fdc3SPaolo Bonzini 440c1f8fdc3SPaolo Bonzini /* ... close the descriptor we inherited and go on. */ 441c1f8fdc3SPaolo Bonzini close(stderr_fd[1]); 442c1f8fdc3SPaolo Bonzini } else { 443c1f8fdc3SPaolo Bonzini bool errors = false; 444c1f8fdc3SPaolo Bonzini char *buf; 445c1f8fdc3SPaolo Bonzini 446c1f8fdc3SPaolo Bonzini /* In the parent. Print error messages from the child until 447c1f8fdc3SPaolo Bonzini * it closes the pipe. 448c1f8fdc3SPaolo Bonzini */ 449c1f8fdc3SPaolo Bonzini close(stderr_fd[1]); 450c1f8fdc3SPaolo Bonzini buf = g_malloc(1024); 451c1f8fdc3SPaolo Bonzini while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { 452c1f8fdc3SPaolo Bonzini errors = true; 453c1f8fdc3SPaolo Bonzini ret = qemu_write_full(STDERR_FILENO, buf, ret); 454c1f8fdc3SPaolo Bonzini if (ret == -1) { 455c1f8fdc3SPaolo Bonzini exit(EXIT_FAILURE); 456c1f8fdc3SPaolo Bonzini } 457c1f8fdc3SPaolo Bonzini } 458c1f8fdc3SPaolo Bonzini if (ret == -1) { 459c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Cannot read from daemon"); 460c1f8fdc3SPaolo Bonzini } 461c1f8fdc3SPaolo Bonzini 462c1f8fdc3SPaolo Bonzini /* Usually the daemon should not print any message. 463c1f8fdc3SPaolo Bonzini * Exit with zero status in that case. 464c1f8fdc3SPaolo Bonzini */ 465c1f8fdc3SPaolo Bonzini exit(errors); 466c1f8fdc3SPaolo Bonzini } 467c1f8fdc3SPaolo Bonzini } 468c1f8fdc3SPaolo Bonzini 469cd831bd7Sths if (device) { 470a517e88bSPaolo Bonzini /* Open before spawning new threads. In the future, we may 471a517e88bSPaolo Bonzini * drop privileges after opening. 472a517e88bSPaolo Bonzini */ 473a517e88bSPaolo Bonzini fd = open(device, O_RDWR); 474a517e88bSPaolo Bonzini if (fd == -1) { 475a517e88bSPaolo Bonzini err(EXIT_FAILURE, "Failed to open %s", device); 476cb7cf0e3SRyota Ozaki } 477cb7cf0e3SRyota Ozaki 478b32f6c28SPaolo Bonzini if (sockpath == NULL) { 479b32f6c28SPaolo Bonzini sockpath = g_malloc(128); 480b32f6c28SPaolo Bonzini snprintf(sockpath, 128, SOCKET_PATH, basename(device)); 481cd831bd7Sths } 482cd831bd7Sths } 483cd831bd7Sths 484802ddc37SPaolo Bonzini bdrv_init(); 485802ddc37SPaolo Bonzini atexit(bdrv_close_all); 486802ddc37SPaolo Bonzini 487802ddc37SPaolo Bonzini bs = bdrv_new("hda"); 488802ddc37SPaolo Bonzini srcpath = argv[optind]; 489802ddc37SPaolo Bonzini if ((ret = bdrv_open(bs, srcpath, flags, NULL)) < 0) { 490802ddc37SPaolo Bonzini errno = -ret; 491802ddc37SPaolo Bonzini err(EXIT_FAILURE, "Failed to bdrv_open '%s'", argv[optind]); 492802ddc37SPaolo Bonzini } 493802ddc37SPaolo Bonzini 494802ddc37SPaolo Bonzini fd_size = bs->total_sectors * 512; 495802ddc37SPaolo Bonzini 496802ddc37SPaolo Bonzini if (partition != -1 && 497802ddc37SPaolo Bonzini find_partition(bs, partition, &dev_offset, &fd_size)) { 498802ddc37SPaolo Bonzini err(EXIT_FAILURE, "Could not find partition %d", partition); 499802ddc37SPaolo Bonzini } 500802ddc37SPaolo Bonzini 501af49bbbeSPaolo Bonzini exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags); 5023b05a8e9Sths 503b32f6c28SPaolo Bonzini if (sockpath) { 504a61c6782SPaolo Bonzini fd = unix_socket_incoming(sockpath); 505cd831bd7Sths } else { 506a61c6782SPaolo Bonzini fd = tcp_socket_incoming(bindto, port); 507cd831bd7Sths } 508cd831bd7Sths 509a61c6782SPaolo Bonzini if (fd == -1) { 5107a5ca864Sbellard return 1; 511a61c6782SPaolo Bonzini } 512f1ef5555SPaolo Bonzini 513f1ef5555SPaolo Bonzini if (device) { 514f1ef5555SPaolo Bonzini int ret; 515f1ef5555SPaolo Bonzini 516f1ef5555SPaolo Bonzini ret = pthread_create(&client_thread, NULL, nbd_client_thread, &fd); 517f1ef5555SPaolo Bonzini if (ret != 0) { 518f1ef5555SPaolo Bonzini errx(EXIT_FAILURE, "Failed to create client thread: %s", 519f1ef5555SPaolo Bonzini strerror(ret)); 520f1ef5555SPaolo Bonzini } 521f1ef5555SPaolo Bonzini } else { 522f1ef5555SPaolo Bonzini /* Shut up GCC warnings. */ 523f1ef5555SPaolo Bonzini memset(&client_thread, 0, sizeof(client_thread)); 524f1ef5555SPaolo Bonzini } 525f1ef5555SPaolo Bonzini 526a61c6782SPaolo Bonzini qemu_init_main_loop(); 527a61c6782SPaolo Bonzini qemu_set_fd_handler2(fd, nbd_can_accept, nbd_accept, NULL, 528a61c6782SPaolo Bonzini (void *)(uintptr_t)fd); 5297a5ca864Sbellard 530*9faf31b6SMichael Tokarev /* now when the initialization is (almost) complete, chdir("/") 531*9faf31b6SMichael Tokarev * to free any busy filesystems */ 532*9faf31b6SMichael Tokarev if (chdir("/") < 0) { 533*9faf31b6SMichael Tokarev err(EXIT_FAILURE, "Could not chdir to root directory"); 534*9faf31b6SMichael Tokarev } 535*9faf31b6SMichael Tokarev 5363b05a8e9Sths do { 537a61c6782SPaolo Bonzini main_loop_wait(false); 538a61c6782SPaolo Bonzini } while (!sigterm_reported && (persistent || !nbd_started || nb_fds > 0)); 5393b05a8e9Sths 540af49bbbeSPaolo Bonzini nbd_export_close(exp); 541b32f6c28SPaolo Bonzini if (sockpath) { 542b32f6c28SPaolo Bonzini unlink(sockpath); 543b32f6c28SPaolo Bonzini } 5447a5ca864Sbellard 545a517e88bSPaolo Bonzini if (device) { 546a517e88bSPaolo Bonzini void *ret; 547a517e88bSPaolo Bonzini pthread_join(client_thread, &ret); 548a517e88bSPaolo Bonzini exit(ret != NULL); 549a517e88bSPaolo Bonzini } else { 550a517e88bSPaolo Bonzini exit(EXIT_SUCCESS); 551a517e88bSPaolo Bonzini } 5527a5ca864Sbellard } 553