| /* |
| * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws> |
| * |
| * Network Block Device |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; under version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include "qemu-common.h" |
| #include "sysemu/block-backend.h" |
| #include "block/block_int.h" |
| #include "block/nbd.h" |
| #include "qemu/main-loop.h" |
| #include "qemu/sockets.h" |
| #include "qemu/error-report.h" |
| #include "block/snapshot.h" |
| #include "qapi/util.h" |
| |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <getopt.h> |
| #include <err.h> |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <netinet/in.h> |
| #include <netinet/tcp.h> |
| #include <arpa/inet.h> |
| #include <signal.h> |
| #include <libgen.h> |
| #include <pthread.h> |
| |
| #define SOCKET_PATH "/var/lock/qemu-nbd-%s" |
| #define QEMU_NBD_OPT_CACHE 1 |
| #define QEMU_NBD_OPT_AIO 2 |
| #define QEMU_NBD_OPT_DISCARD 3 |
| #define QEMU_NBD_OPT_DETECT_ZEROES 4 |
| |
| static NBDExport *exp; |
| static int verbose; |
| static char *srcpath; |
| static char *sockpath; |
| static int persistent = 0; |
| static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state; |
| static int shared = 1; |
| static int nb_fds; |
| |
| static void usage(const char *name) |
| { |
| (printf) ( |
| "Usage: %s [OPTIONS] FILE\n" |
| "QEMU Disk Network Block Device Server\n" |
| "\n" |
| " -h, --help display this help and exit\n" |
| " -V, --version output version information and exit\n" |
| "\n" |
| "Connection properties:\n" |
| " -p, --port=PORT port to listen on (default `%d')\n" |
| " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" |
| " -k, --socket=PATH path to the unix socket\n" |
| " (default '"SOCKET_PATH"')\n" |
| " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" |
| " -t, --persistent don't exit on the last connection\n" |
| " -v, --verbose display extra debugging information\n" |
| "\n" |
| "Exposing part of the image:\n" |
| " -o, --offset=OFFSET offset into the image\n" |
| " -P, --partition=NUM only expose partition NUM\n" |
| "\n" |
| #ifdef __linux__ |
| "Kernel NBD client support:\n" |
| " -c, --connect=DEV connect FILE to the local NBD device DEV\n" |
| " -d, --disconnect disconnect the specified device\n" |
| "\n" |
| #endif |
| "\n" |
| "Block device options:\n" |
| " -f, --format=FORMAT set image format (raw, qcow2, ...)\n" |
| " -r, --read-only export read-only\n" |
| " -s, --snapshot use FILE as an external snapshot, create a temporary\n" |
| " file with backing_file=FILE, redirect the write to\n" |
| " the temporary one\n" |
| " -l, --load-snapshot=SNAPSHOT_PARAM\n" |
| " load an internal snapshot inside FILE and export it\n" |
| " as an read-only device, SNAPSHOT_PARAM format is\n" |
| " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n" |
| " '[ID_OR_NAME]'\n" |
| " -n, --nocache disable host cache\n" |
| " --cache=MODE set cache mode (none, writeback, ...)\n" |
| #ifdef CONFIG_LINUX_AIO |
| " --aio=MODE set AIO mode (native or threads)\n" |
| #endif |
| " --discard=MODE set discard mode (ignore, unmap)\n" |
| " --detect-zeroes=MODE set detect-zeroes mode (off, on, discard)\n" |
| "\n" |
| "Report bugs to <qemu-devel@nongnu.org>\n" |
| , name, NBD_DEFAULT_PORT, "DEVICE"); |
| } |
| |
| static void version(const char *name) |
| { |
| printf( |
| "%s version 0.0.1\n" |
| "Written by Anthony Liguori.\n" |
| "\n" |
| "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n" |
| "This is free software; see the source for copying conditions. There is NO\n" |
| "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" |
| , name); |
| } |
| |
| struct partition_record |
| { |
| uint8_t bootable; |
| uint8_t start_head; |
| uint32_t start_cylinder; |
| uint8_t start_sector; |
| uint8_t system; |
| uint8_t end_head; |
| uint8_t end_cylinder; |
| uint8_t end_sector; |
| uint32_t start_sector_abs; |
| uint32_t nb_sectors_abs; |
| }; |
| |
| static void read_partition(uint8_t *p, struct partition_record *r) |
| { |
| r->bootable = p[0]; |
| r->start_head = p[1]; |
| r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); |
| r->start_sector = p[2] & 0x3f; |
| r->system = p[4]; |
| r->end_head = p[5]; |
| r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); |
| r->end_sector = p[6] & 0x3f; |
| r->start_sector_abs = p[8] | p[9] << 8 | p[10] << 16 | p[11] << 24; |
| r->nb_sectors_abs = p[12] | p[13] << 8 | p[14] << 16 | p[15] << 24; |
| } |
| |
| static int find_partition(BlockDriverState *bs, int partition, |
| off_t *offset, off_t *size) |
| { |
| struct partition_record mbr[4]; |
| uint8_t data[512]; |
| int i; |
| int ext_partnum = 4; |
| int ret; |
| |
| if ((ret = bdrv_read(bs, 0, data, 1)) < 0) { |
| errno = -ret; |
| err(EXIT_FAILURE, "error while reading"); |
| } |
| |
| if (data[510] != 0x55 || data[511] != 0xaa) { |
| return -EINVAL; |
| } |
| |
| for (i = 0; i < 4; i++) { |
| read_partition(&data[446 + 16 * i], &mbr[i]); |
| |
| if (!mbr[i].nb_sectors_abs) |
| continue; |
| |
| if (mbr[i].system == 0xF || mbr[i].system == 0x5) { |
| struct partition_record ext[4]; |
| uint8_t data1[512]; |
| int j; |
| |
| if ((ret = bdrv_read(bs, mbr[i].start_sector_abs, data1, 1)) < 0) { |
| errno = -ret; |
| err(EXIT_FAILURE, "error while reading"); |
| } |
| |
| for (j = 0; j < 4; j++) { |
| read_partition(&data1[446 + 16 * j], &ext[j]); |
| if (!ext[j].nb_sectors_abs) |
| continue; |
| |
| if ((ext_partnum + j + 1) == partition) { |
| *offset = (uint64_t)ext[j].start_sector_abs << 9; |
| *size = (uint64_t)ext[j].nb_sectors_abs << 9; |
| return 0; |
| } |
| } |
| ext_partnum += 4; |
| } else if ((i + 1) == partition) { |
| *offset = (uint64_t)mbr[i].start_sector_abs << 9; |
| *size = (uint64_t)mbr[i].nb_sectors_abs << 9; |
| return 0; |
| } |
| } |
| |
| return -ENOENT; |
| } |
| |
| static void termsig_handler(int signum) |
| { |
| state = TERMINATE; |
| qemu_notify_event(); |
| } |
| |
| static void combine_addr(char *buf, size_t len, const char* address, |
| uint16_t port) |
| { |
| /* If the address-part contains a colon, it's an IPv6 IP so needs [] */ |
| if (strstr(address, ":")) { |
| snprintf(buf, len, "[%s]:%u", address, port); |
| } else { |
| snprintf(buf, len, "%s:%u", address, port); |
| } |
| } |
| |
| static int tcp_socket_incoming(const char *address, uint16_t port) |
| { |
| char address_and_port[128]; |
| Error *local_err = NULL; |
| |
| combine_addr(address_and_port, 128, address, port); |
| int fd = inet_listen(address_and_port, NULL, 0, SOCK_STREAM, 0, &local_err); |
| |
| if (local_err != NULL) { |
| error_report("%s", error_get_pretty(local_err)); |
| error_free(local_err); |
| } |
| return fd; |
| } |
| |
| static int unix_socket_incoming(const char *path) |
| { |
| Error *local_err = NULL; |
| int fd = unix_listen(path, NULL, 0, &local_err); |
| |
| if (local_err != NULL) { |
| error_report("%s", error_get_pretty(local_err)); |
| error_free(local_err); |
| } |
| return fd; |
| } |
| |
| static int unix_socket_outgoing(const char *path) |
| { |
| Error *local_err = NULL; |
| int fd = unix_connect(path, &local_err); |
| |
| if (local_err != NULL) { |
| error_report("%s", error_get_pretty(local_err)); |
| error_free(local_err); |
| } |
| return fd; |
| } |
| |
| static void *show_parts(void *arg) |
| { |
| char *device = arg; |
| int nbd; |
| |
| /* linux just needs an open() to trigger |
| * the partition table update |
| * but remember to load the module with max_part != 0 : |
| * modprobe nbd max_part=63 |
| */ |
| nbd = open(device, O_RDWR); |
| if (nbd >= 0) { |
| close(nbd); |
| } |
| return NULL; |
| } |
| |
| static void *nbd_client_thread(void *arg) |
| { |
| char *device = arg; |
| off_t size; |
| size_t blocksize; |
| uint32_t nbdflags; |
| int fd, sock; |
| int ret; |
| pthread_t show_parts_thread; |
| |
| sock = unix_socket_outgoing(sockpath); |
| if (sock < 0) { |
| goto out; |
| } |
| |
| ret = nbd_receive_negotiate(sock, NULL, &nbdflags, |
| &size, &blocksize); |
| if (ret < 0) { |
| goto out_socket; |
| } |
| |
| fd = open(device, O_RDWR); |
| if (fd < 0) { |
| /* Linux-only, we can use %m in printf. */ |
| fprintf(stderr, "Failed to open %s: %m\n", device); |
| goto out_socket; |
| } |
| |
| ret = nbd_init(fd, sock, nbdflags, size, blocksize); |
| if (ret < 0) { |
| goto out_fd; |
| } |
| |
| /* update partition table */ |
| pthread_create(&show_parts_thread, NULL, show_parts, device); |
| |
| if (verbose) { |
| fprintf(stderr, "NBD device %s is now connected to %s\n", |
| device, srcpath); |
| } else { |
| /* Close stderr so that the qemu-nbd process exits. */ |
| dup2(STDOUT_FILENO, STDERR_FILENO); |
| } |
| |
| ret = nbd_client(fd); |
| if (ret) { |
| goto out_fd; |
| } |
| close(fd); |
| kill(getpid(), SIGTERM); |
| return (void *) EXIT_SUCCESS; |
| |
| out_fd: |
| close(fd); |
| out_socket: |
| closesocket(sock); |
| out: |
| kill(getpid(), SIGTERM); |
| return (void *) EXIT_FAILURE; |
| } |
| |
| static int nbd_can_accept(void *opaque) |
| { |
| return nb_fds < shared; |
| } |
| |
| static void nbd_export_closed(NBDExport *exp) |
| { |
| assert(state == TERMINATING); |
| state = TERMINATED; |
| } |
| |
| static void nbd_client_closed(NBDClient *client) |
| { |
| nb_fds--; |
| if (nb_fds == 0 && !persistent && state == RUNNING) { |
| state = TERMINATE; |
| } |
| qemu_notify_event(); |
| nbd_client_put(client); |
| } |
| |
| static void nbd_accept(void *opaque) |
| { |
| int server_fd = (uintptr_t) opaque; |
| struct sockaddr_in addr; |
| socklen_t addr_len = sizeof(addr); |
| |
| int fd = accept(server_fd, (struct sockaddr *)&addr, &addr_len); |
| if (fd < 0) { |
| perror("accept"); |
| return; |
| } |
| |
| if (state >= TERMINATE) { |
| close(fd); |
| return; |
| } |
| |
| if (nbd_client_new(exp, fd, nbd_client_closed)) { |
| nb_fds++; |
| } else { |
| shutdown(fd, 2); |
| close(fd); |
| } |
| } |
| |
| int main(int argc, char **argv) |
| { |
| BlockBackend *blk; |
| BlockDriverState *bs; |
| BlockDriver *drv; |
| off_t dev_offset = 0; |
| uint32_t nbdflags = 0; |
| bool disconnect = false; |
| const char *bindto = "0.0.0.0"; |
| char *device = NULL; |
| int port = NBD_DEFAULT_PORT; |
| off_t fd_size; |
| QemuOpts *sn_opts = NULL; |
| const char *sn_id_or_name = NULL; |
| const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:"; |
| struct option lopt[] = { |
| { "help", 0, NULL, 'h' }, |
| { "version", 0, NULL, 'V' }, |
| { "bind", 1, NULL, 'b' }, |
| { "port", 1, NULL, 'p' }, |
| { "socket", 1, NULL, 'k' }, |
| { "offset", 1, NULL, 'o' }, |
| { "read-only", 0, NULL, 'r' }, |
| { "partition", 1, NULL, 'P' }, |
| { "connect", 1, NULL, 'c' }, |
| { "disconnect", 0, NULL, 'd' }, |
| { "snapshot", 0, NULL, 's' }, |
| { "load-snapshot", 1, NULL, 'l' }, |
| { "nocache", 0, NULL, 'n' }, |
| { "cache", 1, NULL, QEMU_NBD_OPT_CACHE }, |
| #ifdef CONFIG_LINUX_AIO |
| { "aio", 1, NULL, QEMU_NBD_OPT_AIO }, |
| #endif |
| { "discard", 1, NULL, QEMU_NBD_OPT_DISCARD }, |
| { "detect-zeroes", 1, NULL, QEMU_NBD_OPT_DETECT_ZEROES }, |
| { "shared", 1, NULL, 'e' }, |
| { "format", 1, NULL, 'f' }, |
| { "persistent", 0, NULL, 't' }, |
| { "verbose", 0, NULL, 'v' }, |
| { NULL, 0, NULL, 0 } |
| }; |
| int ch; |
| int opt_ind = 0; |
| int li; |
| char *end; |
| int flags = BDRV_O_RDWR; |
| int partition = -1; |
| int ret; |
| int fd; |
| bool seen_cache = false; |
| bool seen_discard = false; |
| #ifdef CONFIG_LINUX_AIO |
| bool seen_aio = false; |
| #endif |
| pthread_t client_thread; |
| const char *fmt = NULL; |
| Error *local_err = NULL; |
| BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; |
| |
| /* The client thread uses SIGTERM to interrupt the server. A signal |
| * handler ensures that "qemu-nbd -v -c" exits with a nice status code. |
| */ |
| struct sigaction sa_sigterm; |
| memset(&sa_sigterm, 0, sizeof(sa_sigterm)); |
| sa_sigterm.sa_handler = termsig_handler; |
| sigaction(SIGTERM, &sa_sigterm, NULL); |
| qemu_init_exec_dir(argv[0]); |
| |
| while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { |
| switch (ch) { |
| case 's': |
| flags |= BDRV_O_SNAPSHOT; |
| break; |
| case 'n': |
| optarg = (char *) "none"; |
| /* fallthrough */ |
| case QEMU_NBD_OPT_CACHE: |
| if (seen_cache) { |
| errx(EXIT_FAILURE, "-n and --cache can only be specified once"); |
| } |
| seen_cache = true; |
| if (bdrv_parse_cache_flags(optarg, &flags) == -1) { |
| errx(EXIT_FAILURE, "Invalid cache mode `%s'", optarg); |
| } |
| break; |
| #ifdef CONFIG_LINUX_AIO |
| case QEMU_NBD_OPT_AIO: |
| if (seen_aio) { |
| errx(EXIT_FAILURE, "--aio can only be specified once"); |
| } |
| seen_aio = true; |
| if (!strcmp(optarg, "native")) { |
| flags |= BDRV_O_NATIVE_AIO; |
| } else if (!strcmp(optarg, "threads")) { |
| /* this is the default */ |
| } else { |
| errx(EXIT_FAILURE, "invalid aio mode `%s'", optarg); |
| } |
| break; |
| #endif |
| case QEMU_NBD_OPT_DISCARD: |
| if (seen_discard) { |
| errx(EXIT_FAILURE, "--discard can only be specified once"); |
| } |
| seen_discard = true; |
| if (bdrv_parse_discard_flags(optarg, &flags) == -1) { |
| errx(EXIT_FAILURE, "Invalid discard mode `%s'", optarg); |
| } |
| break; |
| case QEMU_NBD_OPT_DETECT_ZEROES: |
| detect_zeroes = |
| qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, |
| optarg, |
| BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX, |
| BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, |
| &local_err); |
| if (local_err) { |
| errx(EXIT_FAILURE, "Failed to parse detect_zeroes mode: %s", |
| error_get_pretty(local_err)); |
| } |
| if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && |
| !(flags & BDRV_O_UNMAP)) { |
| errx(EXIT_FAILURE, "setting detect-zeroes to unmap is not allowed " |
| "without setting discard operation to unmap"); |
| } |
| break; |
| case 'b': |
| bindto = optarg; |
| break; |
| case 'p': |
| li = strtol(optarg, &end, 0); |
| if (*end) { |
| errx(EXIT_FAILURE, "Invalid port `%s'", optarg); |
| } |
| if (li < 1 || li > 65535) { |
| errx(EXIT_FAILURE, "Port out of range `%s'", optarg); |
| } |
| port = (uint16_t)li; |
| break; |
| case 'o': |
| dev_offset = strtoll (optarg, &end, 0); |
| if (*end) { |
| errx(EXIT_FAILURE, "Invalid offset `%s'", optarg); |
| } |
| if (dev_offset < 0) { |
| errx(EXIT_FAILURE, "Offset must be positive `%s'", optarg); |
| } |
| break; |
| case 'l': |
| if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) { |
| sn_opts = qemu_opts_parse(&internal_snapshot_opts, optarg, 0); |
| if (!sn_opts) { |
| errx(EXIT_FAILURE, "Failed in parsing snapshot param `%s'", |
| optarg); |
| } |
| } else { |
| sn_id_or_name = optarg; |
| } |
| /* fall through */ |
| case 'r': |
| nbdflags |= NBD_FLAG_READ_ONLY; |
| flags &= ~BDRV_O_RDWR; |
| break; |
| case 'P': |
| partition = strtol(optarg, &end, 0); |
| if (*end) { |
| errx(EXIT_FAILURE, "Invalid partition `%s'", optarg); |
| } |
| if (partition < 1 || partition > 8) { |
| errx(EXIT_FAILURE, "Invalid partition %d", partition); |
| } |
| break; |
| case 'k': |
| sockpath = optarg; |
| if (sockpath[0] != '/') { |
| errx(EXIT_FAILURE, "socket path must be absolute\n"); |
| } |
| break; |
| case 'd': |
| disconnect = true; |
| break; |
| case 'c': |
| device = optarg; |
| break; |
| case 'e': |
| shared = strtol(optarg, &end, 0); |
| if (*end) { |
| errx(EXIT_FAILURE, "Invalid shared device number '%s'", optarg); |
| } |
| if (shared < 1) { |
| errx(EXIT_FAILURE, "Shared device number must be greater than 0\n"); |
| } |
| break; |
| case 'f': |
| fmt = optarg; |
| break; |
| case 't': |
| persistent = 1; |
| break; |
| case 'v': |
| verbose = 1; |
| break; |
| case 'V': |
| version(argv[0]); |
| exit(0); |
| break; |
| case 'h': |
| usage(argv[0]); |
| exit(0); |
| break; |
| case '?': |
| errx(EXIT_FAILURE, "Try `%s --help' for more information.", |
| argv[0]); |
| } |
| } |
| |
| if ((argc - optind) != 1) { |
| errx(EXIT_FAILURE, "Invalid number of argument.\n" |
| "Try `%s --help' for more information.", |
| argv[0]); |
| } |
| |
| if (disconnect) { |
| fd = open(argv[optind], O_RDWR); |
| if (fd < 0) { |
| err(EXIT_FAILURE, "Cannot open %s", argv[optind]); |
| } |
| nbd_disconnect(fd); |
| |
| close(fd); |
| |
| printf("%s disconnected\n", argv[optind]); |
| |
| return 0; |
| } |
| |
| if (device && !verbose) { |
| int stderr_fd[2]; |
| pid_t pid; |
| int ret; |
| |
| if (qemu_pipe(stderr_fd) < 0) { |
| err(EXIT_FAILURE, "Error setting up communication pipe"); |
| } |
| |
| /* Now daemonize, but keep a communication channel open to |
| * print errors and exit with the proper status code. |
| */ |
| pid = fork(); |
| if (pid == 0) { |
| close(stderr_fd[0]); |
| ret = qemu_daemon(1, 0); |
| |
| /* Temporarily redirect stderr to the parent's pipe... */ |
| dup2(stderr_fd[1], STDERR_FILENO); |
| if (ret < 0) { |
| err(EXIT_FAILURE, "Failed to daemonize"); |
| } |
| |
| /* ... close the descriptor we inherited and go on. */ |
| close(stderr_fd[1]); |
| } else { |
| bool errors = false; |
| char *buf; |
| |
| /* In the parent. Print error messages from the child until |
| * it closes the pipe. |
| */ |
| close(stderr_fd[1]); |
| buf = g_malloc(1024); |
| while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { |
| errors = true; |
| ret = qemu_write_full(STDERR_FILENO, buf, ret); |
| if (ret < 0) { |
| exit(EXIT_FAILURE); |
| } |
| } |
| if (ret < 0) { |
| err(EXIT_FAILURE, "Cannot read from daemon"); |
| } |
| |
| /* Usually the daemon should not print any message. |
| * Exit with zero status in that case. |
| */ |
| exit(errors); |
| } |
| } |
| |
| if (device != NULL && sockpath == NULL) { |
| sockpath = g_malloc(128); |
| snprintf(sockpath, 128, SOCKET_PATH, basename(device)); |
| } |
| |
| if (qemu_init_main_loop(&local_err)) { |
| error_report("%s", error_get_pretty(local_err)); |
| error_free(local_err); |
| exit(EXIT_FAILURE); |
| } |
| bdrv_init(); |
| atexit(bdrv_close_all); |
| |
| if (fmt) { |
| drv = bdrv_find_format(fmt); |
| if (!drv) { |
| errx(EXIT_FAILURE, "Unknown file format '%s'", fmt); |
| } |
| } else { |
| drv = NULL; |
| } |
| |
| blk = blk_new_with_bs("hda", &error_abort); |
| bs = blk_bs(blk); |
| |
| srcpath = argv[optind]; |
| ret = bdrv_open(&bs, srcpath, NULL, NULL, flags, drv, &local_err); |
| if (ret < 0) { |
| errno = -ret; |
| err(EXIT_FAILURE, "Failed to bdrv_open '%s': %s", argv[optind], |
| error_get_pretty(local_err)); |
| } |
| |
| if (sn_opts) { |
| ret = bdrv_snapshot_load_tmp(bs, |
| qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID), |
| qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME), |
| &local_err); |
| } else if (sn_id_or_name) { |
| ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name, |
| &local_err); |
| } |
| if (ret < 0) { |
| errno = -ret; |
| err(EXIT_FAILURE, |
| "Failed to load snapshot: %s", |
| error_get_pretty(local_err)); |
| } |
| |
| bs->detect_zeroes = detect_zeroes; |
| fd_size = bdrv_getlength(bs); |
| |
| if (partition != -1) { |
| ret = find_partition(bs, partition, &dev_offset, &fd_size); |
| if (ret < 0) { |
| errno = -ret; |
| err(EXIT_FAILURE, "Could not find partition %d", partition); |
| } |
| } |
| |
| exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed); |
| |
| if (sockpath) { |
| fd = unix_socket_incoming(sockpath); |
| } else { |
| fd = tcp_socket_incoming(bindto, port); |
| } |
| |
| if (fd < 0) { |
| return 1; |
| } |
| |
| if (device) { |
| int ret; |
| |
| ret = pthread_create(&client_thread, NULL, nbd_client_thread, device); |
| if (ret != 0) { |
| errx(EXIT_FAILURE, "Failed to create client thread: %s", |
| strerror(ret)); |
| } |
| } else { |
| /* Shut up GCC warnings. */ |
| memset(&client_thread, 0, sizeof(client_thread)); |
| } |
| |
| qemu_set_fd_handler2(fd, nbd_can_accept, nbd_accept, NULL, |
| (void *)(uintptr_t)fd); |
| |
| /* now when the initialization is (almost) complete, chdir("/") |
| * to free any busy filesystems */ |
| if (chdir("/") < 0) { |
| err(EXIT_FAILURE, "Could not chdir to root directory"); |
| } |
| |
| state = RUNNING; |
| do { |
| main_loop_wait(false); |
| if (state == TERMINATE) { |
| state = TERMINATING; |
| nbd_export_close(exp); |
| nbd_export_put(exp); |
| exp = NULL; |
| } |
| } while (state != TERMINATED); |
| |
| blk_unref(blk); |
| if (sockpath) { |
| unlink(sockpath); |
| } |
| |
| qemu_opts_del(sn_opts); |
| |
| if (device) { |
| void *ret; |
| pthread_join(client_thread, &ret); |
| exit(ret != NULL); |
| } else { |
| exit(EXIT_SUCCESS); |
| } |
| } |
