--- /dev/null
+/*
+ * 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 "qapi/qmp/qstring.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 int server_fd;
+
+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 = 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) {
+ 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].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) {
+ 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].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)
+{
+ 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_err(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_err(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_err(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;
+ uint32_t nbdflags;
+ int fd, sock;
+ int ret;
+ pthread_t show_parts_thread;
+ Error *local_error = NULL;
+
+ sock = unix_socket_outgoing(sockpath);
+ if (sock < 0) {
+ goto out;
+ }
+
+ ret = nbd_receive_negotiate(sock, NULL, &nbdflags,
+ &size, &local_error);
+ if (ret < 0) {
+ if (local_error) {
+ fprintf(stderr, "%s\n", error_get_pretty(local_error));
+ error_free(local_error);
+ }
+ 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);
+ 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)
+{
+ return nb_fds < shared;
+}
+
+static void nbd_export_closed(NBDExport *exp)
+{
+ assert(state == TERMINATING);
+ state = TERMINATED;
+}
+
+static void nbd_update_server_fd_handler(int fd);
+
+static void nbd_client_closed(NBDClient *client)
+{
+ nb_fds--;
+ if (nb_fds == 0 && !persistent && state == RUNNING) {
+ state = TERMINATE;
+ }
+ nbd_update_server_fd_handler(server_fd);
+ qemu_notify_event();
+ nbd_client_put(client);
+}
+
+static void nbd_accept(void *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++;
+ nbd_update_server_fd_handler(server_fd);
+ } else {
+ shutdown(fd, 2);
+ close(fd);
+ }
+}
+
+static void nbd_update_server_fd_handler(int fd)
+{
+ if (nbd_can_accept()) {
+ qemu_set_fd_handler(fd, nbd_accept, NULL, (void *)(uintptr_t)fd);
+ } else {
+ qemu_set_fd_handler(fd, NULL, NULL, NULL);
+ }
+}
+
+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";
+ 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 = 0;
+ 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;
+ QDict *options = NULL;
+
+ /* 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_noisily(&internal_snapshot_opts,
+ optarg, false);
+ 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) {
+ err(EXIT_FAILURE, "Failed to fork");
+ } 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) {
+ 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_err(local_err);
+ exit(EXIT_FAILURE);
+ }
+ bdrv_init();
+ atexit(bdrv_close_all);
+
+ if (fmt) {
+ options = qdict_new();
+ qdict_put(options, "driver", qstring_from_str(fmt));
+ }
+
+ srcpath = argv[optind];
+ blk = blk_new_open("hda", srcpath, NULL, options, flags, &local_err);
+ if (!blk) {
+ errx(EXIT_FAILURE, "Failed to blk_new_open '%s': %s", argv[optind],
+ error_get_pretty(local_err));
+ }
+ bs = blk_bs(blk);
+
+ 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 = blk_getlength(blk);
+ if (fd_size < 0) {
+ errx(EXIT_FAILURE, "Failed to determine the image length: %s",
+ strerror(-fd_size));
+ }
+
+ if (partition != -1) {
+ ret = find_partition(blk, partition, &dev_offset, &fd_size);
+ if (ret < 0) {
+ errno = -ret;
+ err(EXIT_FAILURE, "Could not find partition %d", partition);
+ }
+ }
+
+ exp = nbd_export_new(blk, dev_offset, fd_size, nbdflags, nbd_export_closed,
+ &local_err);
+ if (!exp) {
+ errx(EXIT_FAILURE, "%s", error_get_pretty(local_err));
+ }
+
+ 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));
+ }
+
+ server_fd = fd;
+ nbd_update_server_fd_handler(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);
+ }
+}
Code Review / kvmfornfv.git / blobdiff