#include "qemu-common.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 QEMU_NBD_OPT_CACHE 1
-#define QEMU_NBD_OPT_AIO 2
-#define QEMU_NBD_OPT_DISCARD 3
+#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;
"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"
-" --cache=MODE set cache mode (none, writeback, ...)\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"
+" --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");
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;
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 (fd >= 0 && nbd_client_new(exp, fd, nbd_client_closed)) {
+ if (nbd_client_new(exp, fd, nbd_client_closed)) {
nb_fds++;
+ } else {
+ shutdown(fd, 2);
+ close(fd);
}
}
char *device = NULL;
int port = NBD_DEFAULT_PORT;
off_t fd_size;
- const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f: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' },
#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) {
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;
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;
case 'f':
fmt = optarg;
break;
- case 't':
- persistent = 1;
- break;
+ case 't':
+ persistent = 1;
+ break;
case 'v':
verbose = 1;
break;
printf("%s disconnected\n", argv[optind]);
- return 0;
+ return 0;
}
if (device && !verbose) {
drv = NULL;
}
- bs = bdrv_new("hda");
+ bs = bdrv_new("hda", &error_abort);
+
srcpath = argv[optind];
- ret = bdrv_open(bs, srcpath, NULL, flags, drv);
+ 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 bdrv_open '%s'", argv[optind]);
+ 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) {
unlink(sockpath);
}
+ if (sn_opts) {
+ qemu_opts_del(sn_opts);
+ }
+
if (device) {
void *ret;
pthread_join(client_thread, &ret);
projects / qemu.git / blobdiff