diff options
Diffstat (limited to 'qemu/qemu-nbd.c')
-rw-r--r-- | qemu/qemu-nbd.c | 959 |
1 files changed, 0 insertions, 959 deletions
diff --git a/qemu/qemu-nbd.c b/qemu/qemu-nbd.c deleted file mode 100644 index c55b40ffc..000000000 --- a/qemu/qemu-nbd.c +++ /dev/null @@ -1,959 +0,0 @@ -/* - * 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/osdep.h" -#include "qapi/error.h" -#include "qemu-common.h" -#include "qemu/cutils.h" -#include "sysemu/block-backend.h" -#include "block/block_int.h" -#include "block/nbd.h" -#include "qemu/main-loop.h" -#include "qemu/error-report.h" -#include "qemu/config-file.h" -#include "block/snapshot.h" -#include "qapi/util.h" -#include "qapi/qmp/qstring.h" -#include "qom/object_interfaces.h" -#include "io/channel-socket.h" -#include "crypto/init.h" - -#include <getopt.h> -#include <libgen.h> -#include <pthread.h> - -#define SOCKET_PATH "/var/lock/qemu-nbd-%s" -#define QEMU_NBD_OPT_CACHE 256 -#define QEMU_NBD_OPT_AIO 257 -#define QEMU_NBD_OPT_DISCARD 258 -#define QEMU_NBD_OPT_DETECT_ZEROES 259 -#define QEMU_NBD_OPT_OBJECT 260 -#define QEMU_NBD_OPT_TLSCREDS 261 -#define QEMU_NBD_OPT_IMAGE_OPTS 262 - -static NBDExport *exp; -static bool newproto; -static int verbose; -static char *srcpath; -static SocketAddress *saddr; -static int persistent = 0; -static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state; -static int shared = 1; -static int nb_fds; -static QIOChannelSocket *server_ioc; -static int server_watch = -1; -static QCryptoTLSCreds *tlscreds; - -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" -" -x, --export-name=NAME expose export by name\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" -"General purpose options:\n" -" --object type,id=ID,... define an object such as 'secret' for providing\n" -" passwords and/or encryption keys\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" -" --aio=MODE set AIO mode (native or threads)\n" -" --discard=MODE set discard mode (ignore, unmap)\n" -" --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n" -" --image-opts treat FILE as a full set of image options\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 = le32_to_cpup((uint32_t *)(p + 8)); - r->nb_sectors_abs = le32_to_cpup((uint32_t *)(p + 12)); -} - -static int find_partition(BlockBackend *blk, 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 = blk_read(blk, 0, data, 1)) < 0) { - error_report("error while reading: %s", strerror(-ret)); - exit(EXIT_FAILURE); - } - - 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].system || !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 = blk_read(blk, mbr[i].start_sector_abs, data1, 1)) < 0) { - error_report("error while reading: %s", strerror(-ret)); - exit(EXIT_FAILURE); - } - - for (j = 0; j < 4; j++) { - read_partition(&data1[446 + 16 * j], &ext[j]); - if (!ext[j].system || !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) -{ - atomic_cmpxchg(&state, RUNNING, TERMINATE); - qemu_notify_event(); -} - - -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; - uint32_t nbdflags; - QIOChannelSocket *sioc; - int fd; - int ret; - pthread_t show_parts_thread; - Error *local_error = NULL; - - sioc = qio_channel_socket_new(); - if (qio_channel_socket_connect_sync(sioc, - saddr, - &local_error) < 0) { - error_report_err(local_error); - goto out; - } - - ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL, &nbdflags, - NULL, NULL, NULL, - &size, &local_error); - if (ret < 0) { - if (local_error) { - error_report_err(local_error); - } - goto out_socket; - } - - fd = open(device, O_RDWR); - if (fd < 0) { - /* Linux-only, we can use %m in printf. */ - error_report("Failed to open %s: %m", device); - goto out_socket; - } - - ret = nbd_init(fd, sioc, nbdflags, size); - 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); - object_unref(OBJECT(sioc)); - kill(getpid(), SIGTERM); - return (void *) EXIT_SUCCESS; - -out_fd: - close(fd); -out_socket: - object_unref(OBJECT(sioc)); -out: - kill(getpid(), SIGTERM); - return (void *) EXIT_FAILURE; -} - -static int nbd_can_accept(void) -{ - return nb_fds < shared; -} - -static void nbd_export_closed(NBDExport *exp) -{ - assert(state == TERMINATING); - state = TERMINATED; -} - -static void nbd_update_server_watch(void); - -static void nbd_client_closed(NBDClient *client) -{ - nb_fds--; - if (nb_fds == 0 && !persistent && state == RUNNING) { - state = TERMINATE; - } - nbd_update_server_watch(); - nbd_client_put(client); -} - -static gboolean nbd_accept(QIOChannel *ioc, GIOCondition cond, gpointer opaque) -{ - QIOChannelSocket *cioc; - - cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc), - NULL); - if (!cioc) { - return TRUE; - } - - if (state >= TERMINATE) { - object_unref(OBJECT(cioc)); - return TRUE; - } - - nb_fds++; - nbd_update_server_watch(); - nbd_client_new(newproto ? NULL : exp, cioc, - tlscreds, NULL, nbd_client_closed); - object_unref(OBJECT(cioc)); - - return TRUE; -} - -static void nbd_update_server_watch(void) -{ - if (nbd_can_accept()) { - if (server_watch == -1) { - server_watch = qio_channel_add_watch(QIO_CHANNEL(server_ioc), - G_IO_IN, - nbd_accept, - NULL, NULL); - } - } else { - if (server_watch != -1) { - g_source_remove(server_watch); - server_watch = -1; - } - } -} - - -static SocketAddress *nbd_build_socket_address(const char *sockpath, - const char *bindto, - const char *port) -{ - SocketAddress *saddr; - - saddr = g_new0(SocketAddress, 1); - if (sockpath) { - saddr->type = SOCKET_ADDRESS_KIND_UNIX; - saddr->u.q_unix.data = g_new0(UnixSocketAddress, 1); - saddr->u.q_unix.data->path = g_strdup(sockpath); - } else { - InetSocketAddress *inet; - saddr->type = SOCKET_ADDRESS_KIND_INET; - inet = saddr->u.inet.data = g_new0(InetSocketAddress, 1); - inet->host = g_strdup(bindto); - if (port) { - inet->port = g_strdup(port); - } else { - inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT); - } - } - - return saddr; -} - - -static QemuOptsList file_opts = { - .name = "file", - .implied_opt_name = "file", - .head = QTAILQ_HEAD_INITIALIZER(file_opts.head), - .desc = { - /* no elements => accept any params */ - { /* end of list */ } - }, -}; - -static QemuOptsList qemu_object_opts = { - .name = "object", - .implied_opt_name = "qom-type", - .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head), - .desc = { - { } - }, -}; - - - -static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp) -{ - Object *obj; - QCryptoTLSCreds *creds; - - obj = object_resolve_path_component( - object_get_objects_root(), id); - if (!obj) { - error_setg(errp, "No TLS credentials with id '%s'", - id); - return NULL; - } - creds = (QCryptoTLSCreds *) - object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS); - if (!creds) { - error_setg(errp, "Object with id '%s' is not TLS credentials", - id); - return NULL; - } - - if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) { - error_setg(errp, - "Expecting TLS credentials with a server endpoint"); - return NULL; - } - object_ref(obj); - return creds; -} - - -int main(int argc, char **argv) -{ - BlockBackend *blk; - BlockDriverState *bs; - off_t dev_offset = 0; - uint32_t nbdflags = 0; - bool disconnect = false; - const char *bindto = "0.0.0.0"; - const char *port = NULL; - char *sockpath = NULL; - char *device = NULL; - 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:x:"; - struct option lopt[] = { - { "help", no_argument, NULL, 'h' }, - { "version", no_argument, NULL, 'V' }, - { "bind", required_argument, NULL, 'b' }, - { "port", required_argument, NULL, 'p' }, - { "socket", required_argument, NULL, 'k' }, - { "offset", required_argument, NULL, 'o' }, - { "read-only", no_argument, NULL, 'r' }, - { "partition", required_argument, NULL, 'P' }, - { "connect", required_argument, NULL, 'c' }, - { "disconnect", no_argument, NULL, 'd' }, - { "snapshot", no_argument, NULL, 's' }, - { "load-snapshot", required_argument, NULL, 'l' }, - { "nocache", no_argument, NULL, 'n' }, - { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE }, - { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO }, - { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD }, - { "detect-zeroes", required_argument, NULL, - QEMU_NBD_OPT_DETECT_ZEROES }, - { "shared", required_argument, NULL, 'e' }, - { "format", required_argument, NULL, 'f' }, - { "persistent", no_argument, NULL, 't' }, - { "verbose", no_argument, NULL, 'v' }, - { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT }, - { "export-name", required_argument, NULL, 'x' }, - { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS }, - { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS }, - { NULL, 0, NULL, 0 } - }; - int ch; - int opt_ind = 0; - char *end; - int flags = BDRV_O_RDWR; - int partition = -1; - int ret = 0; - bool seen_cache = false; - bool seen_discard = false; - bool seen_aio = false; - pthread_t client_thread; - const char *fmt = NULL; - Error *local_err = NULL; - BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; - QDict *options = NULL; - const char *export_name = NULL; - const char *tlscredsid = NULL; - bool imageOpts = false; - bool writethrough = true; - - /* 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); - - if (qcrypto_init(&local_err) < 0) { - error_reportf_err(local_err, "cannot initialize crypto: "); - exit(1); - } - - module_call_init(MODULE_INIT_QOM); - qemu_add_opts(&qemu_object_opts); - 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) { - error_report("-n and --cache can only be specified once"); - exit(EXIT_FAILURE); - } - seen_cache = true; - if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) { - error_report("Invalid cache mode `%s'", optarg); - exit(EXIT_FAILURE); - } - break; - case QEMU_NBD_OPT_AIO: - if (seen_aio) { - error_report("--aio can only be specified once"); - exit(EXIT_FAILURE); - } - seen_aio = true; - if (!strcmp(optarg, "native")) { - flags |= BDRV_O_NATIVE_AIO; - } else if (!strcmp(optarg, "threads")) { - /* this is the default */ - } else { - error_report("invalid aio mode `%s'", optarg); - exit(EXIT_FAILURE); - } - break; - case QEMU_NBD_OPT_DISCARD: - if (seen_discard) { - error_report("--discard can only be specified once"); - exit(EXIT_FAILURE); - } - seen_discard = true; - if (bdrv_parse_discard_flags(optarg, &flags) == -1) { - error_report("Invalid discard mode `%s'", optarg); - exit(EXIT_FAILURE); - } - 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) { - error_reportf_err(local_err, - "Failed to parse detect_zeroes mode: "); - exit(EXIT_FAILURE); - } - if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && - !(flags & BDRV_O_UNMAP)) { - error_report("setting detect-zeroes to unmap is not allowed " - "without setting discard operation to unmap"); - exit(EXIT_FAILURE); - } - break; - case 'b': - bindto = optarg; - break; - case 'p': - port = optarg; - break; - case 'o': - dev_offset = strtoll (optarg, &end, 0); - if (*end) { - error_report("Invalid offset `%s'", optarg); - exit(EXIT_FAILURE); - } - if (dev_offset < 0) { - error_report("Offset must be positive `%s'", optarg); - exit(EXIT_FAILURE); - } - break; - case 'l': - if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) { - sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts, - optarg, false); - if (!sn_opts) { - error_report("Failed in parsing snapshot param `%s'", - optarg); - exit(EXIT_FAILURE); - } - } 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) { - error_report("Invalid partition `%s'", optarg); - exit(EXIT_FAILURE); - } - if (partition < 1 || partition > 8) { - error_report("Invalid partition %d", partition); - exit(EXIT_FAILURE); - } - break; - case 'k': - sockpath = optarg; - if (sockpath[0] != '/') { - error_report("socket path must be absolute"); - exit(EXIT_FAILURE); - } - break; - case 'd': - disconnect = true; - break; - case 'c': - device = optarg; - break; - case 'e': - shared = strtol(optarg, &end, 0); - if (*end) { - error_report("Invalid shared device number '%s'", optarg); - exit(EXIT_FAILURE); - } - if (shared < 1) { - error_report("Shared device number must be greater than 0"); - exit(EXIT_FAILURE); - } - break; - case 'f': - fmt = optarg; - break; - case 't': - persistent = 1; - break; - case 'x': - export_name = optarg; - break; - case 'v': - verbose = 1; - break; - case 'V': - version(argv[0]); - exit(0); - break; - case 'h': - usage(argv[0]); - exit(0); - break; - case '?': - error_report("Try `%s --help' for more information.", argv[0]); - exit(EXIT_FAILURE); - case QEMU_NBD_OPT_OBJECT: { - QemuOpts *opts; - opts = qemu_opts_parse_noisily(&qemu_object_opts, - optarg, true); - if (!opts) { - exit(EXIT_FAILURE); - } - } break; - case QEMU_NBD_OPT_TLSCREDS: - tlscredsid = optarg; - break; - case QEMU_NBD_OPT_IMAGE_OPTS: - imageOpts = true; - break; - } - } - - if ((argc - optind) != 1) { - error_report("Invalid number of arguments"); - error_printf("Try `%s --help' for more information.\n", argv[0]); - exit(EXIT_FAILURE); - } - - if (qemu_opts_foreach(&qemu_object_opts, - user_creatable_add_opts_foreach, - NULL, NULL)) { - exit(EXIT_FAILURE); - } - - if (tlscredsid) { - if (sockpath) { - error_report("TLS is only supported with IPv4/IPv6"); - exit(EXIT_FAILURE); - } - if (device) { - error_report("TLS is not supported with a host device"); - exit(EXIT_FAILURE); - } - if (!export_name) { - /* Set the default NBD protocol export name, since - * we *must* use new style protocol for TLS */ - export_name = ""; - } - tlscreds = nbd_get_tls_creds(tlscredsid, &local_err); - if (local_err) { - error_report("Failed to get TLS creds %s", - error_get_pretty(local_err)); - exit(EXIT_FAILURE); - } - } - - if (disconnect) { - int nbdfd = open(argv[optind], O_RDWR); - if (nbdfd < 0) { - error_report("Cannot open %s: %s", argv[optind], - strerror(errno)); - exit(EXIT_FAILURE); - } - nbd_disconnect(nbdfd); - - close(nbdfd); - - 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) { - error_report("Error setting up communication pipe: %s", - strerror(errno)); - exit(EXIT_FAILURE); - } - - /* Now daemonize, but keep a communication channel open to - * print errors and exit with the proper status code. - */ - pid = fork(); - if (pid < 0) { - error_report("Failed to fork: %s", strerror(errno)); - exit(EXIT_FAILURE); - } else 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) { - error_report("Failed to daemonize: %s", strerror(errno)); - exit(EXIT_FAILURE); - } - - /* ... 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) { - error_report("Cannot read from daemon: %s", - strerror(errno)); - exit(EXIT_FAILURE); - } - - /* 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)); - } - - saddr = nbd_build_socket_address(sockpath, bindto, port); - - if (qemu_init_main_loop(&local_err)) { - error_report_err(local_err); - exit(EXIT_FAILURE); - } - bdrv_init(); - atexit(bdrv_close_all); - - srcpath = argv[optind]; - if (imageOpts) { - QemuOpts *opts; - if (fmt) { - error_report("--image-opts and -f are mutually exclusive"); - exit(EXIT_FAILURE); - } - opts = qemu_opts_parse_noisily(&file_opts, srcpath, true); - if (!opts) { - qemu_opts_reset(&file_opts); - exit(EXIT_FAILURE); - } - options = qemu_opts_to_qdict(opts, NULL); - qemu_opts_reset(&file_opts); - blk = blk_new_open(NULL, NULL, options, flags, &local_err); - } else { - if (fmt) { - options = qdict_new(); - qdict_put(options, "driver", qstring_from_str(fmt)); - } - blk = blk_new_open(srcpath, NULL, options, flags, &local_err); - } - - if (!blk) { - error_reportf_err(local_err, "Failed to blk_new_open '%s': ", - argv[optind]); - exit(EXIT_FAILURE); - } - bs = blk_bs(blk); - - blk_set_enable_write_cache(blk, !writethrough); - - 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) { - error_reportf_err(local_err, "Failed to load snapshot: "); - exit(EXIT_FAILURE); - } - - bs->detect_zeroes = detect_zeroes; - fd_size = blk_getlength(blk); - if (fd_size < 0) { - error_report("Failed to determine the image length: %s", - strerror(-fd_size)); - exit(EXIT_FAILURE); - } - - if (partition != -1) { - ret = find_partition(blk, partition, &dev_offset, &fd_size); - if (ret < 0) { - error_report("Could not find partition %d: %s", partition, - strerror(-ret)); - exit(EXIT_FAILURE); - } - } - - exp = nbd_export_new(blk, dev_offset, fd_size, nbdflags, nbd_export_closed, - &local_err); - if (!exp) { - error_report_err(local_err); - exit(EXIT_FAILURE); - } - if (export_name) { - nbd_export_set_name(exp, export_name); - newproto = true; - } - - server_ioc = qio_channel_socket_new(); - if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) { - object_unref(OBJECT(server_ioc)); - error_report_err(local_err); - return 1; - } - - if (device) { - int ret; - - ret = pthread_create(&client_thread, NULL, nbd_client_thread, device); - if (ret != 0) { - error_report("Failed to create client thread: %s", strerror(ret)); - exit(EXIT_FAILURE); - } - } else { - /* Shut up GCC warnings. */ - memset(&client_thread, 0, sizeof(client_thread)); - } - - nbd_update_server_watch(); - - /* now when the initialization is (almost) complete, chdir("/") - * to free any busy filesystems */ - if (chdir("/") < 0) { - error_report("Could not chdir to root directory: %s", - strerror(errno)); - exit(EXIT_FAILURE); - } - - 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); - } -} |