*/
#include "qemu-common.h"
-#include "block.h"
-#include "nbd.h"
+#include "block/block.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 <libgen.h>
#include <pthread.h>
-#define SOCKET_PATH "/var/lock/qemu-nbd-%s"
+#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 bool sigterm_reported;
-static bool nbd_started;
+static int persistent = 0;
+static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state;
static int shared = 1;
static int nb_fds;
"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"
+" -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"
+" -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"
+" -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"
+" -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"
-" -r, --read-only export read-only\n"
-" -s, --snapshot use snapshot file\n"
-" -n, --nocache disable host cache\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"
, name, NBD_DEFAULT_PORT, "DEVICE");
static void termsig_handler(int signum)
{
- sigterm_reported = true;
+ 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;
ret = nbd_receive_negotiate(sock, NULL, &nbdflags,
&size, &blocksize);
if (ret < 0) {
- goto out;
+ 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", device);
- goto out;
+ 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;
+ goto out_fd;
}
/* update partition table */
ret = nbd_client(fd);
if (ret) {
- goto out;
+ 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;
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)
socklen_t addr_len = sizeof(addr);
int fd = accept(server_fd, (struct sockaddr *)&addr, &addr_len);
- nbd_started = true;
- if (fd >= 0 && nbd_client_new(exp, fd, nbd_client_closed)) {
+ 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)
{
BlockDriverState *bs;
+ BlockDriver *drv;
off_t dev_offset = 0;
uint32_t nbdflags = 0;
bool disconnect = false;
char *device = NULL;
int port = NBD_DEFAULT_PORT;
off_t fd_size;
- const char *sopt = "hVb:o:p:rsnP:c:dvk:e:t";
+ 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' },
{ "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 partition = -1;
int ret;
int fd;
- int persistent = 0;
+ 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.
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) {
flags |= BDRV_O_SNAPSHOT;
break;
case 'n':
- flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB;
+ 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;
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)
+ if (*end) {
errx(EXIT_FAILURE, "Invalid partition `%s'", optarg);
- if (partition < 1 || partition > 8)
+ }
+ if (partition < 1 || partition > 8) {
errx(EXIT_FAILURE, "Invalid partition %d", partition);
+ }
break;
case 'k':
sockpath = optarg;
- if (sockpath[0] != '/')
+ if (sockpath[0] != '/') {
errx(EXIT_FAILURE, "socket path must be absolute\n");
+ }
break;
case 'd':
disconnect = true;
errx(EXIT_FAILURE, "Shared device number must be greater than 0\n");
}
break;
- case 't':
- persistent = 1;
- break;
+ case 'f':
+ fmt = optarg;
+ break;
+ case 't':
+ persistent = 1;
+ break;
case 'v':
verbose = 1;
break;
printf("%s disconnected\n", argv[optind]);
- return 0;
+ return 0;
}
if (device && !verbose) {
snprintf(sockpath, 128, SOCKET_PATH, basename(device));
}
+ qemu_init_main_loop();
bdrv_init();
atexit(bdrv_close_all);
- bs = bdrv_new("hda");
+ if (fmt) {
+ drv = bdrv_find_format(fmt);
+ if (!drv) {
+ errx(EXIT_FAILURE, "Unknown file format '%s'", fmt);
+ }
+ } else {
+ drv = NULL;
+ }
+
+ bs = bdrv_new("hda", &error_abort);
+
srcpath = argv[optind];
- if ((ret = bdrv_open(bs, srcpath, flags, NULL)) < 0) {
+ ret = bdrv_open(&bs, srcpath, NULL, NULL, flags, drv, &local_err);
+ if (ret < 0) {
errno = -ret;
- err(EXIT_FAILURE, "Failed to bdrv_open '%s'", argv[optind]);
+ 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) {
}
}
- exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags);
+ exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed);
if (sockpath) {
fd = unix_socket_incoming(sockpath);
memset(&client_thread, 0, sizeof(client_thread));
}
- qemu_init_main_loop();
qemu_set_fd_handler2(fd, nbd_can_accept, nbd_accept, NULL,
(void *)(uintptr_t)fd);
err(EXIT_FAILURE, "Could not chdir to root directory");
}
+ state = RUNNING;
do {
main_loop_wait(false);
- } while (!sigterm_reported && (persistent || !nbd_started || nb_fds > 0));
+ if (state == TERMINATE) {
+ state = TERMINATING;
+ nbd_export_close(exp);
+ nbd_export_put(exp);
+ exp = NULL;
+ }
+ } while (state != TERMINATED);
- nbd_export_close(exp);
+ bdrv_close(bs);
if (sockpath) {
unlink(sockpath);
}
+ if (sn_opts) {
+ qemu_opts_del(sn_opts);
+ }
+
if (device) {
void *ret;
pthread_join(client_thread, &ret);
projects / qemu.git / blobdiff