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" 20737e150eSPaolo Bonzini #include "block/block.h" 21737e150eSPaolo Bonzini #include "block/nbd.h" 226a1751b7SAlex Bligh #include "qemu/main-loop.h" 237a5ca864Sbellard 247a5ca864Sbellard #include <stdarg.h> 257a5ca864Sbellard #include <stdio.h> 267a5ca864Sbellard #include <getopt.h> 277a5ca864Sbellard #include <err.h> 28cd831bd7Sths #include <sys/types.h> 297a5ca864Sbellard #include <sys/socket.h> 307a5ca864Sbellard #include <netinet/in.h> 317a5ca864Sbellard #include <netinet/tcp.h> 327a5ca864Sbellard #include <arpa/inet.h> 33cd831bd7Sths #include <signal.h> 342bff4b6fSBlue Swirl #include <libgen.h> 35a517e88bSPaolo Bonzini #include <pthread.h> 36cd831bd7Sths 37cd831bd7Sths #define SOCKET_PATH "/var/lock/qemu-nbd-%s" 3839a5235cSPaolo Bonzini #define QEMU_NBD_OPT_CACHE 1 3939a5235cSPaolo Bonzini #define QEMU_NBD_OPT_AIO 2 40ded9d2d5SPaolo Bonzini #define QEMU_NBD_OPT_DISCARD 3 417a5ca864Sbellard 42af49bbbeSPaolo Bonzini static NBDExport *exp; 43b1d8e52eSblueswir1 static int verbose; 44a517e88bSPaolo Bonzini static char *srcpath; 45a517e88bSPaolo Bonzini static char *sockpath; 467860a380SPaolo Bonzini static int persistent = 0; 477860a380SPaolo Bonzini static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state; 48a61c6782SPaolo Bonzini static int shared = 1; 49a61c6782SPaolo Bonzini static int nb_fds; 507a5ca864Sbellard 517a5ca864Sbellard static void usage(const char *name) 527a5ca864Sbellard { 53b033cd86SPaolo Bonzini (printf) ( 547a5ca864Sbellard "Usage: %s [OPTIONS] FILE\n" 557a5ca864Sbellard "QEMU Disk Network Block Device Server\n" 567a5ca864Sbellard "\n" 577a5ca864Sbellard " -h, --help display this help and exit\n" 587a5ca864Sbellard " -V, --version output version information and exit\n" 597a5ca864Sbellard "\n" 60b033cd86SPaolo Bonzini "Connection properties:\n" 61b033cd86SPaolo Bonzini " -p, --port=PORT port to listen on (default `%d')\n" 62b033cd86SPaolo Bonzini " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" 63b033cd86SPaolo Bonzini " -k, --socket=PATH path to the unix socket\n" 64b033cd86SPaolo Bonzini " (default '"SOCKET_PATH"')\n" 65b033cd86SPaolo Bonzini " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" 66b033cd86SPaolo Bonzini " -t, --persistent don't exit on the last connection\n" 67b033cd86SPaolo Bonzini " -v, --verbose display extra debugging information\n" 68b033cd86SPaolo Bonzini "\n" 69b033cd86SPaolo Bonzini "Exposing part of the image:\n" 70b033cd86SPaolo Bonzini " -o, --offset=OFFSET offset into the image\n" 71b033cd86SPaolo Bonzini " -P, --partition=NUM only expose partition NUM\n" 72b033cd86SPaolo Bonzini "\n" 73b033cd86SPaolo Bonzini #ifdef __linux__ 74b033cd86SPaolo Bonzini "Kernel NBD client support:\n" 75b033cd86SPaolo Bonzini " -c, --connect=DEV connect FILE to the local NBD device DEV\n" 76b033cd86SPaolo Bonzini " -d, --disconnect disconnect the specified device\n" 77b033cd86SPaolo Bonzini "\n" 78b033cd86SPaolo Bonzini #endif 79b033cd86SPaolo Bonzini "\n" 80b033cd86SPaolo Bonzini "Block device options:\n" 81b033cd86SPaolo Bonzini " -r, --read-only export read-only\n" 82b033cd86SPaolo Bonzini " -s, --snapshot use snapshot file\n" 83b033cd86SPaolo Bonzini " -n, --nocache disable host cache\n" 8439a5235cSPaolo Bonzini " --cache=MODE set cache mode (none, writeback, ...)\n" 8539a5235cSPaolo Bonzini #ifdef CONFIG_LINUX_AIO 8639a5235cSPaolo Bonzini " --aio=MODE set AIO mode (native or threads)\n" 8739a5235cSPaolo Bonzini #endif 88b033cd86SPaolo Bonzini "\n" 89b033cd86SPaolo Bonzini "Report bugs to <qemu-devel@nongnu.org>\n" 90c2e2872bSLaurent Vivier , name, NBD_DEFAULT_PORT, "DEVICE"); 917a5ca864Sbellard } 927a5ca864Sbellard 937a5ca864Sbellard static void version(const char *name) 947a5ca864Sbellard { 957a5ca864Sbellard printf( 96315bc7aaSths "%s version 0.0.1\n" 977a5ca864Sbellard "Written by Anthony Liguori.\n" 987a5ca864Sbellard "\n" 997a5ca864Sbellard "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n" 1007a5ca864Sbellard "This is free software; see the source for copying conditions. There is NO\n" 1017a5ca864Sbellard "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" 102315bc7aaSths , name); 1037a5ca864Sbellard } 1047a5ca864Sbellard 1057a5ca864Sbellard struct partition_record 1067a5ca864Sbellard { 1077a5ca864Sbellard uint8_t bootable; 1087a5ca864Sbellard uint8_t start_head; 1097a5ca864Sbellard uint32_t start_cylinder; 1107a5ca864Sbellard uint8_t start_sector; 1117a5ca864Sbellard uint8_t system; 1127a5ca864Sbellard uint8_t end_head; 1137a5ca864Sbellard uint8_t end_cylinder; 1147a5ca864Sbellard uint8_t end_sector; 1157a5ca864Sbellard uint32_t start_sector_abs; 1167a5ca864Sbellard uint32_t nb_sectors_abs; 1177a5ca864Sbellard }; 1187a5ca864Sbellard 1197a5ca864Sbellard static void read_partition(uint8_t *p, struct partition_record *r) 1207a5ca864Sbellard { 1217a5ca864Sbellard r->bootable = p[0]; 1227a5ca864Sbellard r->start_head = p[1]; 1237a5ca864Sbellard r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); 1247a5ca864Sbellard r->start_sector = p[2] & 0x3f; 1257a5ca864Sbellard r->system = p[4]; 1267a5ca864Sbellard r->end_head = p[5]; 1277a5ca864Sbellard r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); 1287a5ca864Sbellard r->end_sector = p[6] & 0x3f; 1297a5ca864Sbellard r->start_sector_abs = p[8] | p[9] << 8 | p[10] << 16 | p[11] << 24; 1307a5ca864Sbellard r->nb_sectors_abs = p[12] | p[13] << 8 | p[14] << 16 | p[15] << 24; 1317a5ca864Sbellard } 1327a5ca864Sbellard 1337a5ca864Sbellard static int find_partition(BlockDriverState *bs, int partition, 1347a5ca864Sbellard off_t *offset, off_t *size) 1357a5ca864Sbellard { 1367a5ca864Sbellard struct partition_record mbr[4]; 1377a5ca864Sbellard uint8_t data[512]; 1387a5ca864Sbellard int i; 1397a5ca864Sbellard int ext_partnum = 4; 140cb7cf0e3SRyota Ozaki int ret; 1417a5ca864Sbellard 142cb7cf0e3SRyota Ozaki if ((ret = bdrv_read(bs, 0, data, 1)) < 0) { 143cb7cf0e3SRyota Ozaki errno = -ret; 144cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "error while reading"); 145cb7cf0e3SRyota Ozaki } 1467a5ca864Sbellard 1477a5ca864Sbellard if (data[510] != 0x55 || data[511] != 0xaa) { 148185b4338SPaolo Bonzini return -EINVAL; 1497a5ca864Sbellard } 1507a5ca864Sbellard 1517a5ca864Sbellard for (i = 0; i < 4; i++) { 1527a5ca864Sbellard read_partition(&data[446 + 16 * i], &mbr[i]); 1537a5ca864Sbellard 1547a5ca864Sbellard if (!mbr[i].nb_sectors_abs) 1557a5ca864Sbellard continue; 1567a5ca864Sbellard 1577a5ca864Sbellard if (mbr[i].system == 0xF || mbr[i].system == 0x5) { 1587a5ca864Sbellard struct partition_record ext[4]; 1597a5ca864Sbellard uint8_t data1[512]; 1607a5ca864Sbellard int j; 1617a5ca864Sbellard 162cb7cf0e3SRyota Ozaki if ((ret = bdrv_read(bs, mbr[i].start_sector_abs, data1, 1)) < 0) { 163cb7cf0e3SRyota Ozaki errno = -ret; 164cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "error while reading"); 165cb7cf0e3SRyota Ozaki } 1667a5ca864Sbellard 1677a5ca864Sbellard for (j = 0; j < 4; j++) { 1687a5ca864Sbellard read_partition(&data1[446 + 16 * j], &ext[j]); 1697a5ca864Sbellard if (!ext[j].nb_sectors_abs) 1707a5ca864Sbellard continue; 1717a5ca864Sbellard 1727a5ca864Sbellard if ((ext_partnum + j + 1) == partition) { 1737a5ca864Sbellard *offset = (uint64_t)ext[j].start_sector_abs << 9; 1747a5ca864Sbellard *size = (uint64_t)ext[j].nb_sectors_abs << 9; 1757a5ca864Sbellard return 0; 1767a5ca864Sbellard } 1777a5ca864Sbellard } 1787a5ca864Sbellard ext_partnum += 4; 1797a5ca864Sbellard } else if ((i + 1) == partition) { 1807a5ca864Sbellard *offset = (uint64_t)mbr[i].start_sector_abs << 9; 1817a5ca864Sbellard *size = (uint64_t)mbr[i].nb_sectors_abs << 9; 1827a5ca864Sbellard return 0; 1837a5ca864Sbellard } 1847a5ca864Sbellard } 1857a5ca864Sbellard 186185b4338SPaolo Bonzini return -ENOENT; 1877a5ca864Sbellard } 1887a5ca864Sbellard 189bb345110SPaolo Bonzini static void termsig_handler(int signum) 190bb345110SPaolo Bonzini { 1917860a380SPaolo Bonzini state = TERMINATE; 192a61c6782SPaolo Bonzini qemu_notify_event(); 193bb345110SPaolo Bonzini } 194bb345110SPaolo Bonzini 195a517e88bSPaolo Bonzini static void *show_parts(void *arg) 196cd831bd7Sths { 197a6ac2313SPaolo Bonzini char *device = arg; 198cd831bd7Sths int nbd; 199cd831bd7Sths 200cd831bd7Sths /* linux just needs an open() to trigger 201cd831bd7Sths * the partition table update 202cd831bd7Sths * but remember to load the module with max_part != 0 : 203cd831bd7Sths * modprobe nbd max_part=63 204cd831bd7Sths */ 205cd831bd7Sths nbd = open(device, O_RDWR); 206fc19f8a0SPaolo Bonzini if (nbd >= 0) { 207cd831bd7Sths close(nbd); 208cd831bd7Sths } 209a517e88bSPaolo Bonzini return NULL; 210a517e88bSPaolo Bonzini } 211a517e88bSPaolo Bonzini 212a517e88bSPaolo Bonzini static void *nbd_client_thread(void *arg) 213a517e88bSPaolo Bonzini { 214a6ac2313SPaolo Bonzini char *device = arg; 215a517e88bSPaolo Bonzini off_t size; 216a517e88bSPaolo Bonzini size_t blocksize; 217a517e88bSPaolo Bonzini uint32_t nbdflags; 218a6ac2313SPaolo Bonzini int fd, sock; 219a517e88bSPaolo Bonzini int ret; 220a517e88bSPaolo Bonzini pthread_t show_parts_thread; 221a517e88bSPaolo Bonzini 222a517e88bSPaolo Bonzini sock = unix_socket_outgoing(sockpath); 223fc19f8a0SPaolo Bonzini if (sock < 0) { 224a517e88bSPaolo Bonzini goto out; 225a517e88bSPaolo Bonzini } 226a517e88bSPaolo Bonzini 227a517e88bSPaolo Bonzini ret = nbd_receive_negotiate(sock, NULL, &nbdflags, 228a517e88bSPaolo Bonzini &size, &blocksize); 229fc19f8a0SPaolo Bonzini if (ret < 0) { 230a517e88bSPaolo Bonzini goto out; 231a517e88bSPaolo Bonzini } 232a517e88bSPaolo Bonzini 233a6ac2313SPaolo Bonzini fd = open(device, O_RDWR); 234fc19f8a0SPaolo Bonzini if (fd < 0) { 235a6ac2313SPaolo Bonzini /* Linux-only, we can use %m in printf. */ 236a6ac2313SPaolo Bonzini fprintf(stderr, "Failed to open %s: %m", device); 237a6ac2313SPaolo Bonzini goto out; 238a6ac2313SPaolo Bonzini } 239a6ac2313SPaolo Bonzini 240a517e88bSPaolo Bonzini ret = nbd_init(fd, sock, nbdflags, size, blocksize); 241fc19f8a0SPaolo Bonzini if (ret < 0) { 242a517e88bSPaolo Bonzini goto out; 243a517e88bSPaolo Bonzini } 244a517e88bSPaolo Bonzini 245a517e88bSPaolo Bonzini /* update partition table */ 246a6ac2313SPaolo Bonzini pthread_create(&show_parts_thread, NULL, show_parts, device); 247a517e88bSPaolo Bonzini 248c1f8fdc3SPaolo Bonzini if (verbose) { 249a517e88bSPaolo Bonzini fprintf(stderr, "NBD device %s is now connected to %s\n", 250a517e88bSPaolo Bonzini device, srcpath); 251c1f8fdc3SPaolo Bonzini } else { 252c1f8fdc3SPaolo Bonzini /* Close stderr so that the qemu-nbd process exits. */ 253c1f8fdc3SPaolo Bonzini dup2(STDOUT_FILENO, STDERR_FILENO); 254c1f8fdc3SPaolo Bonzini } 255a517e88bSPaolo Bonzini 256a517e88bSPaolo Bonzini ret = nbd_client(fd); 257a517e88bSPaolo Bonzini if (ret) { 258a517e88bSPaolo Bonzini goto out; 259a517e88bSPaolo Bonzini } 260a517e88bSPaolo Bonzini close(fd); 261a517e88bSPaolo Bonzini kill(getpid(), SIGTERM); 262a517e88bSPaolo Bonzini return (void *) EXIT_SUCCESS; 263a517e88bSPaolo Bonzini 264a517e88bSPaolo Bonzini out: 265a517e88bSPaolo Bonzini kill(getpid(), SIGTERM); 266a517e88bSPaolo Bonzini return (void *) EXIT_FAILURE; 267cd831bd7Sths } 268cd831bd7Sths 269a61c6782SPaolo Bonzini static int nbd_can_accept(void *opaque) 270a61c6782SPaolo Bonzini { 271a61c6782SPaolo Bonzini return nb_fds < shared; 272a61c6782SPaolo Bonzini } 273a61c6782SPaolo Bonzini 2747860a380SPaolo Bonzini static void nbd_export_closed(NBDExport *exp) 2757860a380SPaolo Bonzini { 2767860a380SPaolo Bonzini assert(state == TERMINATING); 2777860a380SPaolo Bonzini state = TERMINATED; 2787860a380SPaolo Bonzini } 2797860a380SPaolo Bonzini 2801743b515SPaolo Bonzini static void nbd_client_closed(NBDClient *client) 281a61c6782SPaolo Bonzini { 282a61c6782SPaolo Bonzini nb_fds--; 2837860a380SPaolo Bonzini if (nb_fds == 0 && !persistent && state == RUNNING) { 2847860a380SPaolo Bonzini state = TERMINATE; 2857860a380SPaolo Bonzini } 2861743b515SPaolo Bonzini qemu_notify_event(); 2877860a380SPaolo Bonzini nbd_client_put(client); 288a61c6782SPaolo Bonzini } 289a61c6782SPaolo Bonzini 290a61c6782SPaolo Bonzini static void nbd_accept(void *opaque) 291a61c6782SPaolo Bonzini { 292a61c6782SPaolo Bonzini int server_fd = (uintptr_t) opaque; 293a61c6782SPaolo Bonzini struct sockaddr_in addr; 294a61c6782SPaolo Bonzini socklen_t addr_len = sizeof(addr); 295a61c6782SPaolo Bonzini 296a61c6782SPaolo Bonzini int fd = accept(server_fd, (struct sockaddr *)&addr, &addr_len); 2977860a380SPaolo Bonzini if (state >= TERMINATE) { 2987860a380SPaolo Bonzini close(fd); 2997860a380SPaolo Bonzini return; 3007860a380SPaolo Bonzini } 3017860a380SPaolo Bonzini 302fc19f8a0SPaolo Bonzini if (fd >= 0 && nbd_client_new(exp, fd, nbd_client_closed)) { 303a61c6782SPaolo Bonzini nb_fds++; 304a61c6782SPaolo Bonzini } 305a61c6782SPaolo Bonzini } 306a61c6782SPaolo Bonzini 3077a5ca864Sbellard int main(int argc, char **argv) 3087a5ca864Sbellard { 3097a5ca864Sbellard BlockDriverState *bs; 310e6b63677SDaniel P. Berrange BlockDriver *drv; 3117a5ca864Sbellard off_t dev_offset = 0; 312b90fb4b8SPaolo Bonzini uint32_t nbdflags = 0; 313cd831bd7Sths bool disconnect = false; 3147a5ca864Sbellard const char *bindto = "0.0.0.0"; 315a6ac2313SPaolo Bonzini char *device = NULL; 316c2e2872bSLaurent Vivier int port = NBD_DEFAULT_PORT; 3177a5ca864Sbellard off_t fd_size; 318e6b63677SDaniel P. Berrange const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:t"; 3197a5ca864Sbellard struct option lopt[] = { 320660f11beSBlue Swirl { "help", 0, NULL, 'h' }, 321660f11beSBlue Swirl { "version", 0, NULL, 'V' }, 322660f11beSBlue Swirl { "bind", 1, NULL, 'b' }, 323660f11beSBlue Swirl { "port", 1, NULL, 'p' }, 324660f11beSBlue Swirl { "socket", 1, NULL, 'k' }, 325660f11beSBlue Swirl { "offset", 1, NULL, 'o' }, 326660f11beSBlue Swirl { "read-only", 0, NULL, 'r' }, 327660f11beSBlue Swirl { "partition", 1, NULL, 'P' }, 328660f11beSBlue Swirl { "connect", 1, NULL, 'c' }, 329660f11beSBlue Swirl { "disconnect", 0, NULL, 'd' }, 330660f11beSBlue Swirl { "snapshot", 0, NULL, 's' }, 331660f11beSBlue Swirl { "nocache", 0, NULL, 'n' }, 33239a5235cSPaolo Bonzini { "cache", 1, NULL, QEMU_NBD_OPT_CACHE }, 33339a5235cSPaolo Bonzini #ifdef CONFIG_LINUX_AIO 33439a5235cSPaolo Bonzini { "aio", 1, NULL, QEMU_NBD_OPT_AIO }, 33539a5235cSPaolo Bonzini #endif 336ded9d2d5SPaolo Bonzini { "discard", 1, NULL, QEMU_NBD_OPT_DISCARD }, 337660f11beSBlue Swirl { "shared", 1, NULL, 'e' }, 338e6b63677SDaniel P. Berrange { "format", 1, NULL, 'f' }, 339660f11beSBlue Swirl { "persistent", 0, NULL, 't' }, 340660f11beSBlue Swirl { "verbose", 0, NULL, 'v' }, 341660f11beSBlue Swirl { NULL, 0, NULL, 0 } 3427a5ca864Sbellard }; 3437a5ca864Sbellard int ch; 3447a5ca864Sbellard int opt_ind = 0; 3457a5ca864Sbellard int li; 3467a5ca864Sbellard char *end; 347f5edb014SNaphtali Sprei int flags = BDRV_O_RDWR; 3487a5ca864Sbellard int partition = -1; 349cd831bd7Sths int ret; 3503b05a8e9Sths int fd; 35139a5235cSPaolo Bonzini bool seen_cache = false; 352ded9d2d5SPaolo Bonzini bool seen_discard = false; 35339a5235cSPaolo Bonzini #ifdef CONFIG_LINUX_AIO 35439a5235cSPaolo Bonzini bool seen_aio = false; 35539a5235cSPaolo Bonzini #endif 356a517e88bSPaolo Bonzini pthread_t client_thread; 357e6b63677SDaniel P. Berrange const char *fmt = NULL; 358*34b5d2c6SMax Reitz Error *local_err = NULL; 3597a5ca864Sbellard 360a517e88bSPaolo Bonzini /* The client thread uses SIGTERM to interrupt the server. A signal 361a517e88bSPaolo Bonzini * handler ensures that "qemu-nbd -v -c" exits with a nice status code. 362a517e88bSPaolo Bonzini */ 363bb345110SPaolo Bonzini struct sigaction sa_sigterm; 364bb345110SPaolo Bonzini memset(&sa_sigterm, 0, sizeof(sa_sigterm)); 365bb345110SPaolo Bonzini sa_sigterm.sa_handler = termsig_handler; 366bb345110SPaolo Bonzini sigaction(SIGTERM, &sa_sigterm, NULL); 367bb345110SPaolo Bonzini 3687a5ca864Sbellard while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { 3697a5ca864Sbellard switch (ch) { 3707a5ca864Sbellard case 's': 3712f726488Sths flags |= BDRV_O_SNAPSHOT; 3722f726488Sths break; 3732f726488Sths case 'n': 37439a5235cSPaolo Bonzini optarg = (char *) "none"; 37539a5235cSPaolo Bonzini /* fallthrough */ 37639a5235cSPaolo Bonzini case QEMU_NBD_OPT_CACHE: 37739a5235cSPaolo Bonzini if (seen_cache) { 37839a5235cSPaolo Bonzini errx(EXIT_FAILURE, "-n and --cache can only be specified once"); 37939a5235cSPaolo Bonzini } 38039a5235cSPaolo Bonzini seen_cache = true; 38139a5235cSPaolo Bonzini if (bdrv_parse_cache_flags(optarg, &flags) == -1) { 38239a5235cSPaolo Bonzini errx(EXIT_FAILURE, "Invalid cache mode `%s'", optarg); 38339a5235cSPaolo Bonzini } 3847a5ca864Sbellard break; 38539a5235cSPaolo Bonzini #ifdef CONFIG_LINUX_AIO 38639a5235cSPaolo Bonzini case QEMU_NBD_OPT_AIO: 38739a5235cSPaolo Bonzini if (seen_aio) { 38839a5235cSPaolo Bonzini errx(EXIT_FAILURE, "--aio can only be specified once"); 38939a5235cSPaolo Bonzini } 39039a5235cSPaolo Bonzini seen_aio = true; 39139a5235cSPaolo Bonzini if (!strcmp(optarg, "native")) { 39239a5235cSPaolo Bonzini flags |= BDRV_O_NATIVE_AIO; 39339a5235cSPaolo Bonzini } else if (!strcmp(optarg, "threads")) { 39439a5235cSPaolo Bonzini /* this is the default */ 39539a5235cSPaolo Bonzini } else { 39639a5235cSPaolo Bonzini errx(EXIT_FAILURE, "invalid aio mode `%s'", optarg); 39739a5235cSPaolo Bonzini } 39839a5235cSPaolo Bonzini break; 39939a5235cSPaolo Bonzini #endif 400ded9d2d5SPaolo Bonzini case QEMU_NBD_OPT_DISCARD: 401ded9d2d5SPaolo Bonzini if (seen_discard) { 402ded9d2d5SPaolo Bonzini errx(EXIT_FAILURE, "--discard can only be specified once"); 403ded9d2d5SPaolo Bonzini } 404ded9d2d5SPaolo Bonzini seen_discard = true; 405ded9d2d5SPaolo Bonzini if (bdrv_parse_discard_flags(optarg, &flags) == -1) { 406ded9d2d5SPaolo Bonzini errx(EXIT_FAILURE, "Invalid discard mode `%s'", optarg); 407ded9d2d5SPaolo Bonzini } 408ded9d2d5SPaolo Bonzini break; 4097a5ca864Sbellard case 'b': 4107a5ca864Sbellard bindto = optarg; 4117a5ca864Sbellard break; 4127a5ca864Sbellard case 'p': 4137a5ca864Sbellard li = strtol(optarg, &end, 0); 4147a5ca864Sbellard if (*end) { 415b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid port `%s'", optarg); 4167a5ca864Sbellard } 4177a5ca864Sbellard if (li < 1 || li > 65535) { 418b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Port out of range `%s'", optarg); 4197a5ca864Sbellard } 4207a5ca864Sbellard port = (uint16_t)li; 4217a5ca864Sbellard break; 4227a5ca864Sbellard case 'o': 4237a5ca864Sbellard dev_offset = strtoll (optarg, &end, 0); 4247a5ca864Sbellard if (*end) { 425b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid offset `%s'", optarg); 4267a5ca864Sbellard } 4277a5ca864Sbellard if (dev_offset < 0) { 428b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Offset must be positive `%s'", optarg); 4297a5ca864Sbellard } 4307a5ca864Sbellard break; 4317a5ca864Sbellard case 'r': 432b90fb4b8SPaolo Bonzini nbdflags |= NBD_FLAG_READ_ONLY; 43307108b29SNaphtali Sprei flags &= ~BDRV_O_RDWR; 4347a5ca864Sbellard break; 4357a5ca864Sbellard case 'P': 4367a5ca864Sbellard partition = strtol(optarg, &end, 0); 4377a5ca864Sbellard if (*end) 438b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid partition `%s'", optarg); 4397a5ca864Sbellard if (partition < 1 || partition > 8) 440b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid partition %d", partition); 4417a5ca864Sbellard break; 442cd831bd7Sths case 'k': 443b32f6c28SPaolo Bonzini sockpath = optarg; 444b32f6c28SPaolo Bonzini if (sockpath[0] != '/') 445b6353beaSRyota Ozaki errx(EXIT_FAILURE, "socket path must be absolute\n"); 446cd831bd7Sths break; 447cd831bd7Sths case 'd': 448cd831bd7Sths disconnect = true; 449cd831bd7Sths break; 450cd831bd7Sths case 'c': 451cd831bd7Sths device = optarg; 452cd831bd7Sths break; 4533b05a8e9Sths case 'e': 4543b05a8e9Sths shared = strtol(optarg, &end, 0); 4553b05a8e9Sths if (*end) { 456b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid shared device number '%s'", optarg); 4573b05a8e9Sths } 4583b05a8e9Sths if (shared < 1) { 459b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Shared device number must be greater than 0\n"); 4603b05a8e9Sths } 4613b05a8e9Sths break; 462e6b63677SDaniel P. Berrange case 'f': 463e6b63677SDaniel P. Berrange fmt = optarg; 464e6b63677SDaniel P. Berrange break; 46575818250Sths case 't': 46675818250Sths persistent = 1; 46775818250Sths break; 4687a5ca864Sbellard case 'v': 4697a5ca864Sbellard verbose = 1; 4707a5ca864Sbellard break; 4717a5ca864Sbellard case 'V': 4727a5ca864Sbellard version(argv[0]); 4737a5ca864Sbellard exit(0); 4747a5ca864Sbellard break; 4757a5ca864Sbellard case 'h': 4767a5ca864Sbellard usage(argv[0]); 4777a5ca864Sbellard exit(0); 4787a5ca864Sbellard break; 4797a5ca864Sbellard case '?': 480b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Try `%s --help' for more information.", 4817a5ca864Sbellard argv[0]); 4827a5ca864Sbellard } 4837a5ca864Sbellard } 4847a5ca864Sbellard 4857a5ca864Sbellard if ((argc - optind) != 1) { 486b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid number of argument.\n" 4877a5ca864Sbellard "Try `%s --help' for more information.", 4887a5ca864Sbellard argv[0]); 4897a5ca864Sbellard } 4907a5ca864Sbellard 491cd831bd7Sths if (disconnect) { 492cd831bd7Sths fd = open(argv[optind], O_RDWR); 493fc19f8a0SPaolo Bonzini if (fd < 0) { 494cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "Cannot open %s", argv[optind]); 495fc19f8a0SPaolo Bonzini } 496cd831bd7Sths nbd_disconnect(fd); 497cd831bd7Sths 498cd831bd7Sths close(fd); 499cd831bd7Sths 500cd831bd7Sths printf("%s disconnected\n", argv[optind]); 501cd831bd7Sths 502cd831bd7Sths return 0; 503cd831bd7Sths } 504cd831bd7Sths 505c1f8fdc3SPaolo Bonzini if (device && !verbose) { 506c1f8fdc3SPaolo Bonzini int stderr_fd[2]; 507c1f8fdc3SPaolo Bonzini pid_t pid; 508c1f8fdc3SPaolo Bonzini int ret; 509c1f8fdc3SPaolo Bonzini 510fc19f8a0SPaolo Bonzini if (qemu_pipe(stderr_fd) < 0) { 511c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Error setting up communication pipe"); 512c1f8fdc3SPaolo Bonzini } 513c1f8fdc3SPaolo Bonzini 514c1f8fdc3SPaolo Bonzini /* Now daemonize, but keep a communication channel open to 515c1f8fdc3SPaolo Bonzini * print errors and exit with the proper status code. 516c1f8fdc3SPaolo Bonzini */ 517c1f8fdc3SPaolo Bonzini pid = fork(); 518c1f8fdc3SPaolo Bonzini if (pid == 0) { 519c1f8fdc3SPaolo Bonzini close(stderr_fd[0]); 5209faf31b6SMichael Tokarev ret = qemu_daemon(1, 0); 521c1f8fdc3SPaolo Bonzini 522c1f8fdc3SPaolo Bonzini /* Temporarily redirect stderr to the parent's pipe... */ 523c1f8fdc3SPaolo Bonzini dup2(stderr_fd[1], STDERR_FILENO); 524fc19f8a0SPaolo Bonzini if (ret < 0) { 525c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Failed to daemonize"); 526c1f8fdc3SPaolo Bonzini } 527c1f8fdc3SPaolo Bonzini 528c1f8fdc3SPaolo Bonzini /* ... close the descriptor we inherited and go on. */ 529c1f8fdc3SPaolo Bonzini close(stderr_fd[1]); 530c1f8fdc3SPaolo Bonzini } else { 531c1f8fdc3SPaolo Bonzini bool errors = false; 532c1f8fdc3SPaolo Bonzini char *buf; 533c1f8fdc3SPaolo Bonzini 534c1f8fdc3SPaolo Bonzini /* In the parent. Print error messages from the child until 535c1f8fdc3SPaolo Bonzini * it closes the pipe. 536c1f8fdc3SPaolo Bonzini */ 537c1f8fdc3SPaolo Bonzini close(stderr_fd[1]); 538c1f8fdc3SPaolo Bonzini buf = g_malloc(1024); 539c1f8fdc3SPaolo Bonzini while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { 540c1f8fdc3SPaolo Bonzini errors = true; 541c1f8fdc3SPaolo Bonzini ret = qemu_write_full(STDERR_FILENO, buf, ret); 542fc19f8a0SPaolo Bonzini if (ret < 0) { 543c1f8fdc3SPaolo Bonzini exit(EXIT_FAILURE); 544c1f8fdc3SPaolo Bonzini } 545c1f8fdc3SPaolo Bonzini } 546fc19f8a0SPaolo Bonzini if (ret < 0) { 547c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Cannot read from daemon"); 548c1f8fdc3SPaolo Bonzini } 549c1f8fdc3SPaolo Bonzini 550c1f8fdc3SPaolo Bonzini /* Usually the daemon should not print any message. 551c1f8fdc3SPaolo Bonzini * Exit with zero status in that case. 552c1f8fdc3SPaolo Bonzini */ 553c1f8fdc3SPaolo Bonzini exit(errors); 554c1f8fdc3SPaolo Bonzini } 555c1f8fdc3SPaolo Bonzini } 556c1f8fdc3SPaolo Bonzini 557a6ac2313SPaolo Bonzini if (device != NULL && sockpath == NULL) { 558b32f6c28SPaolo Bonzini sockpath = g_malloc(128); 559b32f6c28SPaolo Bonzini snprintf(sockpath, 128, SOCKET_PATH, basename(device)); 560cd831bd7Sths } 561cd831bd7Sths 5627e7f4a0eSPaolo Bonzini qemu_init_main_loop(); 563802ddc37SPaolo Bonzini bdrv_init(); 564802ddc37SPaolo Bonzini atexit(bdrv_close_all); 565802ddc37SPaolo Bonzini 566e6b63677SDaniel P. Berrange if (fmt) { 567e6b63677SDaniel P. Berrange drv = bdrv_find_format(fmt); 568e6b63677SDaniel P. Berrange if (!drv) { 569e6b63677SDaniel P. Berrange errx(EXIT_FAILURE, "Unknown file format '%s'", fmt); 570e6b63677SDaniel P. Berrange } 571e6b63677SDaniel P. Berrange } else { 572e6b63677SDaniel P. Berrange drv = NULL; 573e6b63677SDaniel P. Berrange } 574e6b63677SDaniel P. Berrange 575802ddc37SPaolo Bonzini bs = bdrv_new("hda"); 576802ddc37SPaolo Bonzini srcpath = argv[optind]; 577*34b5d2c6SMax Reitz ret = bdrv_open(bs, srcpath, NULL, flags, drv, &local_err); 578e6b63677SDaniel P. Berrange if (ret < 0) { 579802ddc37SPaolo Bonzini errno = -ret; 580*34b5d2c6SMax Reitz err(EXIT_FAILURE, "Failed to bdrv_open '%s': %s", argv[optind], 581*34b5d2c6SMax Reitz error_get_pretty(local_err)); 582802ddc37SPaolo Bonzini } 583802ddc37SPaolo Bonzini 58438ceff04SPaolo Bonzini fd_size = bdrv_getlength(bs); 585802ddc37SPaolo Bonzini 586185b4338SPaolo Bonzini if (partition != -1) { 587185b4338SPaolo Bonzini ret = find_partition(bs, partition, &dev_offset, &fd_size); 588185b4338SPaolo Bonzini if (ret < 0) { 589185b4338SPaolo Bonzini errno = -ret; 590802ddc37SPaolo Bonzini err(EXIT_FAILURE, "Could not find partition %d", partition); 591802ddc37SPaolo Bonzini } 592185b4338SPaolo Bonzini } 593802ddc37SPaolo Bonzini 5947860a380SPaolo Bonzini exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed); 5953b05a8e9Sths 596b32f6c28SPaolo Bonzini if (sockpath) { 597a61c6782SPaolo Bonzini fd = unix_socket_incoming(sockpath); 598cd831bd7Sths } else { 599a61c6782SPaolo Bonzini fd = tcp_socket_incoming(bindto, port); 600cd831bd7Sths } 601cd831bd7Sths 602fc19f8a0SPaolo Bonzini if (fd < 0) { 6037a5ca864Sbellard return 1; 604a61c6782SPaolo Bonzini } 605f1ef5555SPaolo Bonzini 606f1ef5555SPaolo Bonzini if (device) { 607f1ef5555SPaolo Bonzini int ret; 608f1ef5555SPaolo Bonzini 609a6ac2313SPaolo Bonzini ret = pthread_create(&client_thread, NULL, nbd_client_thread, device); 610f1ef5555SPaolo Bonzini if (ret != 0) { 611f1ef5555SPaolo Bonzini errx(EXIT_FAILURE, "Failed to create client thread: %s", 612f1ef5555SPaolo Bonzini strerror(ret)); 613f1ef5555SPaolo Bonzini } 614f1ef5555SPaolo Bonzini } else { 615f1ef5555SPaolo Bonzini /* Shut up GCC warnings. */ 616f1ef5555SPaolo Bonzini memset(&client_thread, 0, sizeof(client_thread)); 617f1ef5555SPaolo Bonzini } 618f1ef5555SPaolo Bonzini 619a61c6782SPaolo Bonzini qemu_set_fd_handler2(fd, nbd_can_accept, nbd_accept, NULL, 620a61c6782SPaolo Bonzini (void *)(uintptr_t)fd); 6217a5ca864Sbellard 6229faf31b6SMichael Tokarev /* now when the initialization is (almost) complete, chdir("/") 6239faf31b6SMichael Tokarev * to free any busy filesystems */ 6249faf31b6SMichael Tokarev if (chdir("/") < 0) { 6259faf31b6SMichael Tokarev err(EXIT_FAILURE, "Could not chdir to root directory"); 6269faf31b6SMichael Tokarev } 6279faf31b6SMichael Tokarev 6287860a380SPaolo Bonzini state = RUNNING; 6293b05a8e9Sths do { 630a61c6782SPaolo Bonzini main_loop_wait(false); 6317860a380SPaolo Bonzini if (state == TERMINATE) { 6327860a380SPaolo Bonzini state = TERMINATING; 633af49bbbeSPaolo Bonzini nbd_export_close(exp); 6342c8d9f06SPaolo Bonzini nbd_export_put(exp); 6357860a380SPaolo Bonzini exp = NULL; 6367860a380SPaolo Bonzini } 6377860a380SPaolo Bonzini } while (state != TERMINATED); 6382c8d9f06SPaolo Bonzini 6397860a380SPaolo Bonzini bdrv_close(bs); 640b32f6c28SPaolo Bonzini if (sockpath) { 641b32f6c28SPaolo Bonzini unlink(sockpath); 642b32f6c28SPaolo Bonzini } 6437a5ca864Sbellard 644a517e88bSPaolo Bonzini if (device) { 645a517e88bSPaolo Bonzini void *ret; 646a517e88bSPaolo Bonzini pthread_join(client_thread, &ret); 647a517e88bSPaolo Bonzini exit(ret != NULL); 648a517e88bSPaolo Bonzini } else { 649a517e88bSPaolo Bonzini exit(EXIT_SUCCESS); 650a517e88bSPaolo Bonzini } 6517a5ca864Sbellard } 652