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" 238c116b0eSWenchao Xia #include "block/snapshot.h" 247a5ca864Sbellard 257a5ca864Sbellard #include <stdarg.h> 267a5ca864Sbellard #include <stdio.h> 277a5ca864Sbellard #include <getopt.h> 287a5ca864Sbellard #include <err.h> 29cd831bd7Sths #include <sys/types.h> 307a5ca864Sbellard #include <sys/socket.h> 317a5ca864Sbellard #include <netinet/in.h> 327a5ca864Sbellard #include <netinet/tcp.h> 337a5ca864Sbellard #include <arpa/inet.h> 34cd831bd7Sths #include <signal.h> 352bff4b6fSBlue Swirl #include <libgen.h> 36a517e88bSPaolo Bonzini #include <pthread.h> 37cd831bd7Sths 38cd831bd7Sths #define SOCKET_PATH "/var/lock/qemu-nbd-%s" 3939a5235cSPaolo Bonzini #define QEMU_NBD_OPT_CACHE 1 4039a5235cSPaolo Bonzini #define QEMU_NBD_OPT_AIO 2 41ded9d2d5SPaolo Bonzini #define QEMU_NBD_OPT_DISCARD 3 427a5ca864Sbellard 43af49bbbeSPaolo Bonzini static NBDExport *exp; 44b1d8e52eSblueswir1 static int verbose; 45a517e88bSPaolo Bonzini static char *srcpath; 46a517e88bSPaolo Bonzini static char *sockpath; 477860a380SPaolo Bonzini static int persistent = 0; 487860a380SPaolo Bonzini static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state; 49a61c6782SPaolo Bonzini static int shared = 1; 50a61c6782SPaolo Bonzini static int nb_fds; 517a5ca864Sbellard 527a5ca864Sbellard static void usage(const char *name) 537a5ca864Sbellard { 54b033cd86SPaolo Bonzini (printf) ( 557a5ca864Sbellard "Usage: %s [OPTIONS] FILE\n" 567a5ca864Sbellard "QEMU Disk Network Block Device Server\n" 577a5ca864Sbellard "\n" 587a5ca864Sbellard " -h, --help display this help and exit\n" 597a5ca864Sbellard " -V, --version output version information and exit\n" 607a5ca864Sbellard "\n" 61b033cd86SPaolo Bonzini "Connection properties:\n" 62b033cd86SPaolo Bonzini " -p, --port=PORT port to listen on (default `%d')\n" 63b033cd86SPaolo Bonzini " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" 64b033cd86SPaolo Bonzini " -k, --socket=PATH path to the unix socket\n" 65b033cd86SPaolo Bonzini " (default '"SOCKET_PATH"')\n" 66b033cd86SPaolo Bonzini " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" 67b033cd86SPaolo Bonzini " -t, --persistent don't exit on the last connection\n" 68b033cd86SPaolo Bonzini " -v, --verbose display extra debugging information\n" 69b033cd86SPaolo Bonzini "\n" 70b033cd86SPaolo Bonzini "Exposing part of the image:\n" 71b033cd86SPaolo Bonzini " -o, --offset=OFFSET offset into the image\n" 72b033cd86SPaolo Bonzini " -P, --partition=NUM only expose partition NUM\n" 73b033cd86SPaolo Bonzini "\n" 74b033cd86SPaolo Bonzini #ifdef __linux__ 75b033cd86SPaolo Bonzini "Kernel NBD client support:\n" 76b033cd86SPaolo Bonzini " -c, --connect=DEV connect FILE to the local NBD device DEV\n" 77b033cd86SPaolo Bonzini " -d, --disconnect disconnect the specified device\n" 78b033cd86SPaolo Bonzini "\n" 79b033cd86SPaolo Bonzini #endif 80b033cd86SPaolo Bonzini "\n" 81b033cd86SPaolo Bonzini "Block device options:\n" 82*4323fdcfSWenchao Xia " -f, --format=FORMAT set image format (raw, qcow2, ...)\n" 83b033cd86SPaolo Bonzini " -r, --read-only export read-only\n" 848c116b0eSWenchao Xia " -s, --snapshot use FILE as an external snapshot, create a temporary\n" 858c116b0eSWenchao Xia " file with backing_file=FILE, redirect the write to\n" 868c116b0eSWenchao Xia " the temporary one\n" 878c116b0eSWenchao Xia " -l, --load-snapshot=SNAPSHOT_PARAM\n" 888c116b0eSWenchao Xia " load an internal snapshot inside FILE and export it\n" 898c116b0eSWenchao Xia " as an read-only device, SNAPSHOT_PARAM format is\n" 908c116b0eSWenchao Xia " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n" 918c116b0eSWenchao Xia " '[ID_OR_NAME]'\n" 92b033cd86SPaolo Bonzini " -n, --nocache disable host cache\n" 9339a5235cSPaolo Bonzini " --cache=MODE set cache mode (none, writeback, ...)\n" 9439a5235cSPaolo Bonzini #ifdef CONFIG_LINUX_AIO 9539a5235cSPaolo Bonzini " --aio=MODE set AIO mode (native or threads)\n" 9639a5235cSPaolo Bonzini #endif 97b033cd86SPaolo Bonzini "\n" 98b033cd86SPaolo Bonzini "Report bugs to <qemu-devel@nongnu.org>\n" 99c2e2872bSLaurent Vivier , name, NBD_DEFAULT_PORT, "DEVICE"); 1007a5ca864Sbellard } 1017a5ca864Sbellard 1027a5ca864Sbellard static void version(const char *name) 1037a5ca864Sbellard { 1047a5ca864Sbellard printf( 105315bc7aaSths "%s version 0.0.1\n" 1067a5ca864Sbellard "Written by Anthony Liguori.\n" 1077a5ca864Sbellard "\n" 1087a5ca864Sbellard "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n" 1097a5ca864Sbellard "This is free software; see the source for copying conditions. There is NO\n" 1107a5ca864Sbellard "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" 111315bc7aaSths , name); 1127a5ca864Sbellard } 1137a5ca864Sbellard 1147a5ca864Sbellard struct partition_record 1157a5ca864Sbellard { 1167a5ca864Sbellard uint8_t bootable; 1177a5ca864Sbellard uint8_t start_head; 1187a5ca864Sbellard uint32_t start_cylinder; 1197a5ca864Sbellard uint8_t start_sector; 1207a5ca864Sbellard uint8_t system; 1217a5ca864Sbellard uint8_t end_head; 1227a5ca864Sbellard uint8_t end_cylinder; 1237a5ca864Sbellard uint8_t end_sector; 1247a5ca864Sbellard uint32_t start_sector_abs; 1257a5ca864Sbellard uint32_t nb_sectors_abs; 1267a5ca864Sbellard }; 1277a5ca864Sbellard 1287a5ca864Sbellard static void read_partition(uint8_t *p, struct partition_record *r) 1297a5ca864Sbellard { 1307a5ca864Sbellard r->bootable = p[0]; 1317a5ca864Sbellard r->start_head = p[1]; 1327a5ca864Sbellard r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); 1337a5ca864Sbellard r->start_sector = p[2] & 0x3f; 1347a5ca864Sbellard r->system = p[4]; 1357a5ca864Sbellard r->end_head = p[5]; 1367a5ca864Sbellard r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); 1377a5ca864Sbellard r->end_sector = p[6] & 0x3f; 1387a5ca864Sbellard r->start_sector_abs = p[8] | p[9] << 8 | p[10] << 16 | p[11] << 24; 1397a5ca864Sbellard r->nb_sectors_abs = p[12] | p[13] << 8 | p[14] << 16 | p[15] << 24; 1407a5ca864Sbellard } 1417a5ca864Sbellard 1427a5ca864Sbellard static int find_partition(BlockDriverState *bs, int partition, 1437a5ca864Sbellard off_t *offset, off_t *size) 1447a5ca864Sbellard { 1457a5ca864Sbellard struct partition_record mbr[4]; 1467a5ca864Sbellard uint8_t data[512]; 1477a5ca864Sbellard int i; 1487a5ca864Sbellard int ext_partnum = 4; 149cb7cf0e3SRyota Ozaki int ret; 1507a5ca864Sbellard 151cb7cf0e3SRyota Ozaki if ((ret = bdrv_read(bs, 0, data, 1)) < 0) { 152cb7cf0e3SRyota Ozaki errno = -ret; 153cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "error while reading"); 154cb7cf0e3SRyota Ozaki } 1557a5ca864Sbellard 1567a5ca864Sbellard if (data[510] != 0x55 || data[511] != 0xaa) { 157185b4338SPaolo Bonzini return -EINVAL; 1587a5ca864Sbellard } 1597a5ca864Sbellard 1607a5ca864Sbellard for (i = 0; i < 4; i++) { 1617a5ca864Sbellard read_partition(&data[446 + 16 * i], &mbr[i]); 1627a5ca864Sbellard 1637a5ca864Sbellard if (!mbr[i].nb_sectors_abs) 1647a5ca864Sbellard continue; 1657a5ca864Sbellard 1667a5ca864Sbellard if (mbr[i].system == 0xF || mbr[i].system == 0x5) { 1677a5ca864Sbellard struct partition_record ext[4]; 1687a5ca864Sbellard uint8_t data1[512]; 1697a5ca864Sbellard int j; 1707a5ca864Sbellard 171cb7cf0e3SRyota Ozaki if ((ret = bdrv_read(bs, mbr[i].start_sector_abs, data1, 1)) < 0) { 172cb7cf0e3SRyota Ozaki errno = -ret; 173cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "error while reading"); 174cb7cf0e3SRyota Ozaki } 1757a5ca864Sbellard 1767a5ca864Sbellard for (j = 0; j < 4; j++) { 1777a5ca864Sbellard read_partition(&data1[446 + 16 * j], &ext[j]); 1787a5ca864Sbellard if (!ext[j].nb_sectors_abs) 1797a5ca864Sbellard continue; 1807a5ca864Sbellard 1817a5ca864Sbellard if ((ext_partnum + j + 1) == partition) { 1827a5ca864Sbellard *offset = (uint64_t)ext[j].start_sector_abs << 9; 1837a5ca864Sbellard *size = (uint64_t)ext[j].nb_sectors_abs << 9; 1847a5ca864Sbellard return 0; 1857a5ca864Sbellard } 1867a5ca864Sbellard } 1877a5ca864Sbellard ext_partnum += 4; 1887a5ca864Sbellard } else if ((i + 1) == partition) { 1897a5ca864Sbellard *offset = (uint64_t)mbr[i].start_sector_abs << 9; 1907a5ca864Sbellard *size = (uint64_t)mbr[i].nb_sectors_abs << 9; 1917a5ca864Sbellard return 0; 1927a5ca864Sbellard } 1937a5ca864Sbellard } 1947a5ca864Sbellard 195185b4338SPaolo Bonzini return -ENOENT; 1967a5ca864Sbellard } 1977a5ca864Sbellard 198bb345110SPaolo Bonzini static void termsig_handler(int signum) 199bb345110SPaolo Bonzini { 2007860a380SPaolo Bonzini state = TERMINATE; 201a61c6782SPaolo Bonzini qemu_notify_event(); 202bb345110SPaolo Bonzini } 203bb345110SPaolo Bonzini 204a517e88bSPaolo Bonzini static void *show_parts(void *arg) 205cd831bd7Sths { 206a6ac2313SPaolo Bonzini char *device = arg; 207cd831bd7Sths int nbd; 208cd831bd7Sths 209cd831bd7Sths /* linux just needs an open() to trigger 210cd831bd7Sths * the partition table update 211cd831bd7Sths * but remember to load the module with max_part != 0 : 212cd831bd7Sths * modprobe nbd max_part=63 213cd831bd7Sths */ 214cd831bd7Sths nbd = open(device, O_RDWR); 215fc19f8a0SPaolo Bonzini if (nbd >= 0) { 216cd831bd7Sths close(nbd); 217cd831bd7Sths } 218a517e88bSPaolo Bonzini return NULL; 219a517e88bSPaolo Bonzini } 220a517e88bSPaolo Bonzini 221a517e88bSPaolo Bonzini static void *nbd_client_thread(void *arg) 222a517e88bSPaolo Bonzini { 223a6ac2313SPaolo Bonzini char *device = arg; 224a517e88bSPaolo Bonzini off_t size; 225a517e88bSPaolo Bonzini size_t blocksize; 226a517e88bSPaolo Bonzini uint32_t nbdflags; 227a6ac2313SPaolo Bonzini int fd, sock; 228a517e88bSPaolo Bonzini int ret; 229a517e88bSPaolo Bonzini pthread_t show_parts_thread; 230a517e88bSPaolo Bonzini 231a517e88bSPaolo Bonzini sock = unix_socket_outgoing(sockpath); 232fc19f8a0SPaolo Bonzini if (sock < 0) { 233a517e88bSPaolo Bonzini goto out; 234a517e88bSPaolo Bonzini } 235a517e88bSPaolo Bonzini 236a517e88bSPaolo Bonzini ret = nbd_receive_negotiate(sock, NULL, &nbdflags, 237a517e88bSPaolo Bonzini &size, &blocksize); 238fc19f8a0SPaolo Bonzini if (ret < 0) { 239a517e88bSPaolo Bonzini goto out; 240a517e88bSPaolo Bonzini } 241a517e88bSPaolo Bonzini 242a6ac2313SPaolo Bonzini fd = open(device, O_RDWR); 243fc19f8a0SPaolo Bonzini if (fd < 0) { 244a6ac2313SPaolo Bonzini /* Linux-only, we can use %m in printf. */ 245a6ac2313SPaolo Bonzini fprintf(stderr, "Failed to open %s: %m", device); 246a6ac2313SPaolo Bonzini goto out; 247a6ac2313SPaolo Bonzini } 248a6ac2313SPaolo Bonzini 249a517e88bSPaolo Bonzini ret = nbd_init(fd, sock, nbdflags, size, blocksize); 250fc19f8a0SPaolo Bonzini if (ret < 0) { 251a517e88bSPaolo Bonzini goto out; 252a517e88bSPaolo Bonzini } 253a517e88bSPaolo Bonzini 254a517e88bSPaolo Bonzini /* update partition table */ 255a6ac2313SPaolo Bonzini pthread_create(&show_parts_thread, NULL, show_parts, device); 256a517e88bSPaolo Bonzini 257c1f8fdc3SPaolo Bonzini if (verbose) { 258a517e88bSPaolo Bonzini fprintf(stderr, "NBD device %s is now connected to %s\n", 259a517e88bSPaolo Bonzini device, srcpath); 260c1f8fdc3SPaolo Bonzini } else { 261c1f8fdc3SPaolo Bonzini /* Close stderr so that the qemu-nbd process exits. */ 262c1f8fdc3SPaolo Bonzini dup2(STDOUT_FILENO, STDERR_FILENO); 263c1f8fdc3SPaolo Bonzini } 264a517e88bSPaolo Bonzini 265a517e88bSPaolo Bonzini ret = nbd_client(fd); 266a517e88bSPaolo Bonzini if (ret) { 267a517e88bSPaolo Bonzini goto out; 268a517e88bSPaolo Bonzini } 269a517e88bSPaolo Bonzini close(fd); 270a517e88bSPaolo Bonzini kill(getpid(), SIGTERM); 271a517e88bSPaolo Bonzini return (void *) EXIT_SUCCESS; 272a517e88bSPaolo Bonzini 273a517e88bSPaolo Bonzini out: 274a517e88bSPaolo Bonzini kill(getpid(), SIGTERM); 275a517e88bSPaolo Bonzini return (void *) EXIT_FAILURE; 276cd831bd7Sths } 277cd831bd7Sths 278a61c6782SPaolo Bonzini static int nbd_can_accept(void *opaque) 279a61c6782SPaolo Bonzini { 280a61c6782SPaolo Bonzini return nb_fds < shared; 281a61c6782SPaolo Bonzini } 282a61c6782SPaolo Bonzini 2837860a380SPaolo Bonzini static void nbd_export_closed(NBDExport *exp) 2847860a380SPaolo Bonzini { 2857860a380SPaolo Bonzini assert(state == TERMINATING); 2867860a380SPaolo Bonzini state = TERMINATED; 2877860a380SPaolo Bonzini } 2887860a380SPaolo Bonzini 2891743b515SPaolo Bonzini static void nbd_client_closed(NBDClient *client) 290a61c6782SPaolo Bonzini { 291a61c6782SPaolo Bonzini nb_fds--; 2927860a380SPaolo Bonzini if (nb_fds == 0 && !persistent && state == RUNNING) { 2937860a380SPaolo Bonzini state = TERMINATE; 2947860a380SPaolo Bonzini } 2951743b515SPaolo Bonzini qemu_notify_event(); 2967860a380SPaolo Bonzini nbd_client_put(client); 297a61c6782SPaolo Bonzini } 298a61c6782SPaolo Bonzini 299a61c6782SPaolo Bonzini static void nbd_accept(void *opaque) 300a61c6782SPaolo Bonzini { 301a61c6782SPaolo Bonzini int server_fd = (uintptr_t) opaque; 302a61c6782SPaolo Bonzini struct sockaddr_in addr; 303a61c6782SPaolo Bonzini socklen_t addr_len = sizeof(addr); 304a61c6782SPaolo Bonzini 305a61c6782SPaolo Bonzini int fd = accept(server_fd, (struct sockaddr *)&addr, &addr_len); 3067860a380SPaolo Bonzini if (state >= TERMINATE) { 3077860a380SPaolo Bonzini close(fd); 3087860a380SPaolo Bonzini return; 3097860a380SPaolo Bonzini } 3107860a380SPaolo Bonzini 311fc19f8a0SPaolo Bonzini if (fd >= 0 && nbd_client_new(exp, fd, nbd_client_closed)) { 312a61c6782SPaolo Bonzini nb_fds++; 313a61c6782SPaolo Bonzini } 314a61c6782SPaolo Bonzini } 315a61c6782SPaolo Bonzini 3167a5ca864Sbellard int main(int argc, char **argv) 3177a5ca864Sbellard { 3187a5ca864Sbellard BlockDriverState *bs; 319e6b63677SDaniel P. Berrange BlockDriver *drv; 3207a5ca864Sbellard off_t dev_offset = 0; 321b90fb4b8SPaolo Bonzini uint32_t nbdflags = 0; 322cd831bd7Sths bool disconnect = false; 3237a5ca864Sbellard const char *bindto = "0.0.0.0"; 324a6ac2313SPaolo Bonzini char *device = NULL; 325c2e2872bSLaurent Vivier int port = NBD_DEFAULT_PORT; 3267a5ca864Sbellard off_t fd_size; 3278c116b0eSWenchao Xia QemuOpts *sn_opts = NULL; 3288c116b0eSWenchao Xia const char *sn_id_or_name = NULL; 3298c116b0eSWenchao Xia const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:"; 3307a5ca864Sbellard struct option lopt[] = { 331660f11beSBlue Swirl { "help", 0, NULL, 'h' }, 332660f11beSBlue Swirl { "version", 0, NULL, 'V' }, 333660f11beSBlue Swirl { "bind", 1, NULL, 'b' }, 334660f11beSBlue Swirl { "port", 1, NULL, 'p' }, 335660f11beSBlue Swirl { "socket", 1, NULL, 'k' }, 336660f11beSBlue Swirl { "offset", 1, NULL, 'o' }, 337660f11beSBlue Swirl { "read-only", 0, NULL, 'r' }, 338660f11beSBlue Swirl { "partition", 1, NULL, 'P' }, 339660f11beSBlue Swirl { "connect", 1, NULL, 'c' }, 340660f11beSBlue Swirl { "disconnect", 0, NULL, 'd' }, 341660f11beSBlue Swirl { "snapshot", 0, NULL, 's' }, 3428c116b0eSWenchao Xia { "load-snapshot", 1, NULL, 'l' }, 343660f11beSBlue Swirl { "nocache", 0, NULL, 'n' }, 34439a5235cSPaolo Bonzini { "cache", 1, NULL, QEMU_NBD_OPT_CACHE }, 34539a5235cSPaolo Bonzini #ifdef CONFIG_LINUX_AIO 34639a5235cSPaolo Bonzini { "aio", 1, NULL, QEMU_NBD_OPT_AIO }, 34739a5235cSPaolo Bonzini #endif 348ded9d2d5SPaolo Bonzini { "discard", 1, NULL, QEMU_NBD_OPT_DISCARD }, 349660f11beSBlue Swirl { "shared", 1, NULL, 'e' }, 350e6b63677SDaniel P. Berrange { "format", 1, NULL, 'f' }, 351660f11beSBlue Swirl { "persistent", 0, NULL, 't' }, 352660f11beSBlue Swirl { "verbose", 0, NULL, 'v' }, 353660f11beSBlue Swirl { NULL, 0, NULL, 0 } 3547a5ca864Sbellard }; 3557a5ca864Sbellard int ch; 3567a5ca864Sbellard int opt_ind = 0; 3577a5ca864Sbellard int li; 3587a5ca864Sbellard char *end; 359f5edb014SNaphtali Sprei int flags = BDRV_O_RDWR; 3607a5ca864Sbellard int partition = -1; 361cd831bd7Sths int ret; 3623b05a8e9Sths int fd; 36339a5235cSPaolo Bonzini bool seen_cache = false; 364ded9d2d5SPaolo Bonzini bool seen_discard = false; 36539a5235cSPaolo Bonzini #ifdef CONFIG_LINUX_AIO 36639a5235cSPaolo Bonzini bool seen_aio = false; 36739a5235cSPaolo Bonzini #endif 368a517e88bSPaolo Bonzini pthread_t client_thread; 369e6b63677SDaniel P. Berrange const char *fmt = NULL; 37034b5d2c6SMax Reitz Error *local_err = NULL; 3717a5ca864Sbellard 372a517e88bSPaolo Bonzini /* The client thread uses SIGTERM to interrupt the server. A signal 373a517e88bSPaolo Bonzini * handler ensures that "qemu-nbd -v -c" exits with a nice status code. 374a517e88bSPaolo Bonzini */ 375bb345110SPaolo Bonzini struct sigaction sa_sigterm; 376bb345110SPaolo Bonzini memset(&sa_sigterm, 0, sizeof(sa_sigterm)); 377bb345110SPaolo Bonzini sa_sigterm.sa_handler = termsig_handler; 378bb345110SPaolo Bonzini sigaction(SIGTERM, &sa_sigterm, NULL); 379bb345110SPaolo Bonzini 3807a5ca864Sbellard while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { 3817a5ca864Sbellard switch (ch) { 3827a5ca864Sbellard case 's': 3832f726488Sths flags |= BDRV_O_SNAPSHOT; 3842f726488Sths break; 3852f726488Sths case 'n': 38639a5235cSPaolo Bonzini optarg = (char *) "none"; 38739a5235cSPaolo Bonzini /* fallthrough */ 38839a5235cSPaolo Bonzini case QEMU_NBD_OPT_CACHE: 38939a5235cSPaolo Bonzini if (seen_cache) { 39039a5235cSPaolo Bonzini errx(EXIT_FAILURE, "-n and --cache can only be specified once"); 39139a5235cSPaolo Bonzini } 39239a5235cSPaolo Bonzini seen_cache = true; 39339a5235cSPaolo Bonzini if (bdrv_parse_cache_flags(optarg, &flags) == -1) { 39439a5235cSPaolo Bonzini errx(EXIT_FAILURE, "Invalid cache mode `%s'", optarg); 39539a5235cSPaolo Bonzini } 3967a5ca864Sbellard break; 39739a5235cSPaolo Bonzini #ifdef CONFIG_LINUX_AIO 39839a5235cSPaolo Bonzini case QEMU_NBD_OPT_AIO: 39939a5235cSPaolo Bonzini if (seen_aio) { 40039a5235cSPaolo Bonzini errx(EXIT_FAILURE, "--aio can only be specified once"); 40139a5235cSPaolo Bonzini } 40239a5235cSPaolo Bonzini seen_aio = true; 40339a5235cSPaolo Bonzini if (!strcmp(optarg, "native")) { 40439a5235cSPaolo Bonzini flags |= BDRV_O_NATIVE_AIO; 40539a5235cSPaolo Bonzini } else if (!strcmp(optarg, "threads")) { 40639a5235cSPaolo Bonzini /* this is the default */ 40739a5235cSPaolo Bonzini } else { 40839a5235cSPaolo Bonzini errx(EXIT_FAILURE, "invalid aio mode `%s'", optarg); 40939a5235cSPaolo Bonzini } 41039a5235cSPaolo Bonzini break; 41139a5235cSPaolo Bonzini #endif 412ded9d2d5SPaolo Bonzini case QEMU_NBD_OPT_DISCARD: 413ded9d2d5SPaolo Bonzini if (seen_discard) { 414ded9d2d5SPaolo Bonzini errx(EXIT_FAILURE, "--discard can only be specified once"); 415ded9d2d5SPaolo Bonzini } 416ded9d2d5SPaolo Bonzini seen_discard = true; 417ded9d2d5SPaolo Bonzini if (bdrv_parse_discard_flags(optarg, &flags) == -1) { 418ded9d2d5SPaolo Bonzini errx(EXIT_FAILURE, "Invalid discard mode `%s'", optarg); 419ded9d2d5SPaolo Bonzini } 420ded9d2d5SPaolo Bonzini break; 4217a5ca864Sbellard case 'b': 4227a5ca864Sbellard bindto = optarg; 4237a5ca864Sbellard break; 4247a5ca864Sbellard case 'p': 4257a5ca864Sbellard li = strtol(optarg, &end, 0); 4267a5ca864Sbellard if (*end) { 427b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid port `%s'", optarg); 4287a5ca864Sbellard } 4297a5ca864Sbellard if (li < 1 || li > 65535) { 430b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Port out of range `%s'", optarg); 4317a5ca864Sbellard } 4327a5ca864Sbellard port = (uint16_t)li; 4337a5ca864Sbellard break; 4347a5ca864Sbellard case 'o': 4357a5ca864Sbellard dev_offset = strtoll (optarg, &end, 0); 4367a5ca864Sbellard if (*end) { 437b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid offset `%s'", optarg); 4387a5ca864Sbellard } 4397a5ca864Sbellard if (dev_offset < 0) { 440b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Offset must be positive `%s'", optarg); 4417a5ca864Sbellard } 4427a5ca864Sbellard break; 4438c116b0eSWenchao Xia case 'l': 4448c116b0eSWenchao Xia if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) { 4458c116b0eSWenchao Xia sn_opts = qemu_opts_parse(&internal_snapshot_opts, optarg, 0); 4468c116b0eSWenchao Xia if (!sn_opts) { 4478c116b0eSWenchao Xia errx(EXIT_FAILURE, "Failed in parsing snapshot param `%s'", 4488c116b0eSWenchao Xia optarg); 4498c116b0eSWenchao Xia } 4508c116b0eSWenchao Xia } else { 4518c116b0eSWenchao Xia sn_id_or_name = optarg; 4528c116b0eSWenchao Xia } 4538c116b0eSWenchao Xia /* fall through */ 4547a5ca864Sbellard case 'r': 455b90fb4b8SPaolo Bonzini nbdflags |= NBD_FLAG_READ_ONLY; 45607108b29SNaphtali Sprei flags &= ~BDRV_O_RDWR; 4577a5ca864Sbellard break; 4587a5ca864Sbellard case 'P': 4597a5ca864Sbellard partition = strtol(optarg, &end, 0); 4607a5ca864Sbellard if (*end) 461b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid partition `%s'", optarg); 4627a5ca864Sbellard if (partition < 1 || partition > 8) 463b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid partition %d", partition); 4647a5ca864Sbellard break; 465cd831bd7Sths case 'k': 466b32f6c28SPaolo Bonzini sockpath = optarg; 467b32f6c28SPaolo Bonzini if (sockpath[0] != '/') 468b6353beaSRyota Ozaki errx(EXIT_FAILURE, "socket path must be absolute\n"); 469cd831bd7Sths break; 470cd831bd7Sths case 'd': 471cd831bd7Sths disconnect = true; 472cd831bd7Sths break; 473cd831bd7Sths case 'c': 474cd831bd7Sths device = optarg; 475cd831bd7Sths break; 4763b05a8e9Sths case 'e': 4773b05a8e9Sths shared = strtol(optarg, &end, 0); 4783b05a8e9Sths if (*end) { 479b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid shared device number '%s'", optarg); 4803b05a8e9Sths } 4813b05a8e9Sths if (shared < 1) { 482b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Shared device number must be greater than 0\n"); 4833b05a8e9Sths } 4843b05a8e9Sths break; 485e6b63677SDaniel P. Berrange case 'f': 486e6b63677SDaniel P. Berrange fmt = optarg; 487e6b63677SDaniel P. Berrange break; 48875818250Sths case 't': 48975818250Sths persistent = 1; 49075818250Sths break; 4917a5ca864Sbellard case 'v': 4927a5ca864Sbellard verbose = 1; 4937a5ca864Sbellard break; 4947a5ca864Sbellard case 'V': 4957a5ca864Sbellard version(argv[0]); 4967a5ca864Sbellard exit(0); 4977a5ca864Sbellard break; 4987a5ca864Sbellard case 'h': 4997a5ca864Sbellard usage(argv[0]); 5007a5ca864Sbellard exit(0); 5017a5ca864Sbellard break; 5027a5ca864Sbellard case '?': 503b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Try `%s --help' for more information.", 5047a5ca864Sbellard argv[0]); 5057a5ca864Sbellard } 5067a5ca864Sbellard } 5077a5ca864Sbellard 5087a5ca864Sbellard if ((argc - optind) != 1) { 509b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid number of argument.\n" 5107a5ca864Sbellard "Try `%s --help' for more information.", 5117a5ca864Sbellard argv[0]); 5127a5ca864Sbellard } 5137a5ca864Sbellard 514cd831bd7Sths if (disconnect) { 515cd831bd7Sths fd = open(argv[optind], O_RDWR); 516fc19f8a0SPaolo Bonzini if (fd < 0) { 517cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "Cannot open %s", argv[optind]); 518fc19f8a0SPaolo Bonzini } 519cd831bd7Sths nbd_disconnect(fd); 520cd831bd7Sths 521cd831bd7Sths close(fd); 522cd831bd7Sths 523cd831bd7Sths printf("%s disconnected\n", argv[optind]); 524cd831bd7Sths 525cd831bd7Sths return 0; 526cd831bd7Sths } 527cd831bd7Sths 528c1f8fdc3SPaolo Bonzini if (device && !verbose) { 529c1f8fdc3SPaolo Bonzini int stderr_fd[2]; 530c1f8fdc3SPaolo Bonzini pid_t pid; 531c1f8fdc3SPaolo Bonzini int ret; 532c1f8fdc3SPaolo Bonzini 533fc19f8a0SPaolo Bonzini if (qemu_pipe(stderr_fd) < 0) { 534c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Error setting up communication pipe"); 535c1f8fdc3SPaolo Bonzini } 536c1f8fdc3SPaolo Bonzini 537c1f8fdc3SPaolo Bonzini /* Now daemonize, but keep a communication channel open to 538c1f8fdc3SPaolo Bonzini * print errors and exit with the proper status code. 539c1f8fdc3SPaolo Bonzini */ 540c1f8fdc3SPaolo Bonzini pid = fork(); 541c1f8fdc3SPaolo Bonzini if (pid == 0) { 542c1f8fdc3SPaolo Bonzini close(stderr_fd[0]); 5439faf31b6SMichael Tokarev ret = qemu_daemon(1, 0); 544c1f8fdc3SPaolo Bonzini 545c1f8fdc3SPaolo Bonzini /* Temporarily redirect stderr to the parent's pipe... */ 546c1f8fdc3SPaolo Bonzini dup2(stderr_fd[1], STDERR_FILENO); 547fc19f8a0SPaolo Bonzini if (ret < 0) { 548c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Failed to daemonize"); 549c1f8fdc3SPaolo Bonzini } 550c1f8fdc3SPaolo Bonzini 551c1f8fdc3SPaolo Bonzini /* ... close the descriptor we inherited and go on. */ 552c1f8fdc3SPaolo Bonzini close(stderr_fd[1]); 553c1f8fdc3SPaolo Bonzini } else { 554c1f8fdc3SPaolo Bonzini bool errors = false; 555c1f8fdc3SPaolo Bonzini char *buf; 556c1f8fdc3SPaolo Bonzini 557c1f8fdc3SPaolo Bonzini /* In the parent. Print error messages from the child until 558c1f8fdc3SPaolo Bonzini * it closes the pipe. 559c1f8fdc3SPaolo Bonzini */ 560c1f8fdc3SPaolo Bonzini close(stderr_fd[1]); 561c1f8fdc3SPaolo Bonzini buf = g_malloc(1024); 562c1f8fdc3SPaolo Bonzini while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { 563c1f8fdc3SPaolo Bonzini errors = true; 564c1f8fdc3SPaolo Bonzini ret = qemu_write_full(STDERR_FILENO, buf, ret); 565fc19f8a0SPaolo Bonzini if (ret < 0) { 566c1f8fdc3SPaolo Bonzini exit(EXIT_FAILURE); 567c1f8fdc3SPaolo Bonzini } 568c1f8fdc3SPaolo Bonzini } 569fc19f8a0SPaolo Bonzini if (ret < 0) { 570c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Cannot read from daemon"); 571c1f8fdc3SPaolo Bonzini } 572c1f8fdc3SPaolo Bonzini 573c1f8fdc3SPaolo Bonzini /* Usually the daemon should not print any message. 574c1f8fdc3SPaolo Bonzini * Exit with zero status in that case. 575c1f8fdc3SPaolo Bonzini */ 576c1f8fdc3SPaolo Bonzini exit(errors); 577c1f8fdc3SPaolo Bonzini } 578c1f8fdc3SPaolo Bonzini } 579c1f8fdc3SPaolo Bonzini 580a6ac2313SPaolo Bonzini if (device != NULL && sockpath == NULL) { 581b32f6c28SPaolo Bonzini sockpath = g_malloc(128); 582b32f6c28SPaolo Bonzini snprintf(sockpath, 128, SOCKET_PATH, basename(device)); 583cd831bd7Sths } 584cd831bd7Sths 5857e7f4a0eSPaolo Bonzini qemu_init_main_loop(); 586802ddc37SPaolo Bonzini bdrv_init(); 587802ddc37SPaolo Bonzini atexit(bdrv_close_all); 588802ddc37SPaolo Bonzini 589e6b63677SDaniel P. Berrange if (fmt) { 590e6b63677SDaniel P. Berrange drv = bdrv_find_format(fmt); 591e6b63677SDaniel P. Berrange if (!drv) { 592e6b63677SDaniel P. Berrange errx(EXIT_FAILURE, "Unknown file format '%s'", fmt); 593e6b63677SDaniel P. Berrange } 594e6b63677SDaniel P. Berrange } else { 595e6b63677SDaniel P. Berrange drv = NULL; 596e6b63677SDaniel P. Berrange } 597e6b63677SDaniel P. Berrange 598802ddc37SPaolo Bonzini bs = bdrv_new("hda"); 599802ddc37SPaolo Bonzini srcpath = argv[optind]; 60034b5d2c6SMax Reitz ret = bdrv_open(bs, srcpath, NULL, flags, drv, &local_err); 601e6b63677SDaniel P. Berrange if (ret < 0) { 602802ddc37SPaolo Bonzini errno = -ret; 60334b5d2c6SMax Reitz err(EXIT_FAILURE, "Failed to bdrv_open '%s': %s", argv[optind], 60434b5d2c6SMax Reitz error_get_pretty(local_err)); 605802ddc37SPaolo Bonzini } 606802ddc37SPaolo Bonzini 6078c116b0eSWenchao Xia if (sn_opts) { 6088c116b0eSWenchao Xia ret = bdrv_snapshot_load_tmp(bs, 6098c116b0eSWenchao Xia qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID), 6108c116b0eSWenchao Xia qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME), 6118c116b0eSWenchao Xia &local_err); 6128c116b0eSWenchao Xia } else if (sn_id_or_name) { 6138c116b0eSWenchao Xia ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name, 6148c116b0eSWenchao Xia &local_err); 6158c116b0eSWenchao Xia } 6168c116b0eSWenchao Xia if (ret < 0) { 6178c116b0eSWenchao Xia errno = -ret; 6188c116b0eSWenchao Xia err(EXIT_FAILURE, 6198c116b0eSWenchao Xia "Failed to load snapshot: %s", 6208c116b0eSWenchao Xia error_get_pretty(local_err)); 6218c116b0eSWenchao Xia } 6228c116b0eSWenchao Xia 62338ceff04SPaolo Bonzini fd_size = bdrv_getlength(bs); 624802ddc37SPaolo Bonzini 625185b4338SPaolo Bonzini if (partition != -1) { 626185b4338SPaolo Bonzini ret = find_partition(bs, partition, &dev_offset, &fd_size); 627185b4338SPaolo Bonzini if (ret < 0) { 628185b4338SPaolo Bonzini errno = -ret; 629802ddc37SPaolo Bonzini err(EXIT_FAILURE, "Could not find partition %d", partition); 630802ddc37SPaolo Bonzini } 631185b4338SPaolo Bonzini } 632802ddc37SPaolo Bonzini 6337860a380SPaolo Bonzini exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed); 6343b05a8e9Sths 635b32f6c28SPaolo Bonzini if (sockpath) { 636a61c6782SPaolo Bonzini fd = unix_socket_incoming(sockpath); 637cd831bd7Sths } else { 638a61c6782SPaolo Bonzini fd = tcp_socket_incoming(bindto, port); 639cd831bd7Sths } 640cd831bd7Sths 641fc19f8a0SPaolo Bonzini if (fd < 0) { 6427a5ca864Sbellard return 1; 643a61c6782SPaolo Bonzini } 644f1ef5555SPaolo Bonzini 645f1ef5555SPaolo Bonzini if (device) { 646f1ef5555SPaolo Bonzini int ret; 647f1ef5555SPaolo Bonzini 648a6ac2313SPaolo Bonzini ret = pthread_create(&client_thread, NULL, nbd_client_thread, device); 649f1ef5555SPaolo Bonzini if (ret != 0) { 650f1ef5555SPaolo Bonzini errx(EXIT_FAILURE, "Failed to create client thread: %s", 651f1ef5555SPaolo Bonzini strerror(ret)); 652f1ef5555SPaolo Bonzini } 653f1ef5555SPaolo Bonzini } else { 654f1ef5555SPaolo Bonzini /* Shut up GCC warnings. */ 655f1ef5555SPaolo Bonzini memset(&client_thread, 0, sizeof(client_thread)); 656f1ef5555SPaolo Bonzini } 657f1ef5555SPaolo Bonzini 658a61c6782SPaolo Bonzini qemu_set_fd_handler2(fd, nbd_can_accept, nbd_accept, NULL, 659a61c6782SPaolo Bonzini (void *)(uintptr_t)fd); 6607a5ca864Sbellard 6619faf31b6SMichael Tokarev /* now when the initialization is (almost) complete, chdir("/") 6629faf31b6SMichael Tokarev * to free any busy filesystems */ 6639faf31b6SMichael Tokarev if (chdir("/") < 0) { 6649faf31b6SMichael Tokarev err(EXIT_FAILURE, "Could not chdir to root directory"); 6659faf31b6SMichael Tokarev } 6669faf31b6SMichael Tokarev 6677860a380SPaolo Bonzini state = RUNNING; 6683b05a8e9Sths do { 669a61c6782SPaolo Bonzini main_loop_wait(false); 6707860a380SPaolo Bonzini if (state == TERMINATE) { 6717860a380SPaolo Bonzini state = TERMINATING; 672af49bbbeSPaolo Bonzini nbd_export_close(exp); 6732c8d9f06SPaolo Bonzini nbd_export_put(exp); 6747860a380SPaolo Bonzini exp = NULL; 6757860a380SPaolo Bonzini } 6767860a380SPaolo Bonzini } while (state != TERMINATED); 6772c8d9f06SPaolo Bonzini 6787860a380SPaolo Bonzini bdrv_close(bs); 679b32f6c28SPaolo Bonzini if (sockpath) { 680b32f6c28SPaolo Bonzini unlink(sockpath); 681b32f6c28SPaolo Bonzini } 6827a5ca864Sbellard 6838c116b0eSWenchao Xia if (sn_opts) { 6848c116b0eSWenchao Xia qemu_opts_del(sn_opts); 6858c116b0eSWenchao Xia } 6868c116b0eSWenchao Xia 687a517e88bSPaolo Bonzini if (device) { 688a517e88bSPaolo Bonzini void *ret; 689a517e88bSPaolo Bonzini pthread_join(client_thread, &ret); 690a517e88bSPaolo Bonzini exit(ret != NULL); 691a517e88bSPaolo Bonzini } else { 692a517e88bSPaolo Bonzini exit(EXIT_SUCCESS); 693a517e88bSPaolo Bonzini } 6947a5ca864Sbellard } 695