mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-09-06 18:05:37 +00:00
![Max Reitz](/assets/img/avatar_default.png)
Signed-off-by: Max Reitz <mreitz@redhat.com> Message-Id: <1424887718-10800-13-git-send-email-mreitz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
799 lines
23 KiB
C
799 lines
23 KiB
C
/*
|
|
* 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 = 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 *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;
|
|
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(&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) {
|
|
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));
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|