1114 lines
35 KiB
C
1114 lines
35 KiB
C
/*
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* Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
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*
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* Network Block Device
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; under version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include <getopt.h>
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#include <libgen.h>
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#include <pthread.h>
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#include "qemu-common.h"
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#include "qapi/error.h"
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#include "qemu/cutils.h"
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#include "sysemu/block-backend.h"
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#include "sysemu/runstate.h" /* for qemu_system_killed() prototype */
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#include "block/block_int.h"
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#include "block/nbd.h"
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#include "qemu/main-loop.h"
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#include "qemu/module.h"
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#include "qemu/option.h"
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#include "qemu/error-report.h"
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#include "qemu/config-file.h"
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#include "qemu/bswap.h"
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#include "qemu/log.h"
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#include "qemu/systemd.h"
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#include "block/snapshot.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/qmp/qstring.h"
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#include "qom/object_interfaces.h"
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#include "io/channel-socket.h"
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#include "io/net-listener.h"
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#include "crypto/init.h"
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#include "crypto/tlscreds.h"
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#include "trace/control.h"
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#include "qemu-version.h"
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#ifdef __linux__
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#define HAVE_NBD_DEVICE 1
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#else
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#define HAVE_NBD_DEVICE 0
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#endif
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#define SOCKET_PATH "/var/lock/qemu-nbd-%s"
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#define QEMU_NBD_OPT_CACHE 256
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#define QEMU_NBD_OPT_AIO 257
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#define QEMU_NBD_OPT_DISCARD 258
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#define QEMU_NBD_OPT_DETECT_ZEROES 259
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#define QEMU_NBD_OPT_OBJECT 260
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#define QEMU_NBD_OPT_TLSCREDS 261
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#define QEMU_NBD_OPT_IMAGE_OPTS 262
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#define QEMU_NBD_OPT_FORK 263
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#define QEMU_NBD_OPT_TLSAUTHZ 264
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#define QEMU_NBD_OPT_PID_FILE 265
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#define MBR_SIZE 512
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static int verbose;
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static char *srcpath;
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static SocketAddress *saddr;
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static int persistent = 0;
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static enum { RUNNING, TERMINATE, TERMINATED } state;
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static int shared = 1;
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static int nb_fds;
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static QIONetListener *server;
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static QCryptoTLSCreds *tlscreds;
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static const char *tlsauthz;
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static void usage(const char *name)
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{
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(printf) (
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"Usage: %s [OPTIONS] FILE\n"
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" or: %s -L [OPTIONS]\n"
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"QEMU Disk Network Block Device Utility\n"
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"\n"
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" -h, --help display this help and exit\n"
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" -V, --version output version information and exit\n"
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"\n"
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"Connection properties:\n"
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" -p, --port=PORT port to listen on (default `%d')\n"
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" -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
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" -k, --socket=PATH path to the unix socket\n"
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" (default '"SOCKET_PATH"')\n"
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" -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
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" -t, --persistent don't exit on the last connection\n"
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" -v, --verbose display extra debugging information\n"
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" -x, --export-name=NAME expose export by name (default is empty string)\n"
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" -D, --description=TEXT export a human-readable description\n"
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"\n"
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"Exposing part of the image:\n"
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" -o, --offset=OFFSET offset into the image\n"
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" -A, --allocation-depth expose the allocation depth\n"
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" -B, --bitmap=NAME expose a persistent dirty bitmap\n"
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"\n"
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"General purpose options:\n"
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" -L, --list list exports available from another NBD server\n"
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" --object type,id=ID,... define an object such as 'secret' for providing\n"
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" passwords and/or encryption keys\n"
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" --tls-creds=ID use id of an earlier --object to provide TLS\n"
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" --tls-authz=ID use id of an earlier --object to provide\n"
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" authorization\n"
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" -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
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" specify tracing options\n"
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" --fork fork off the server process and exit the parent\n"
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" once the server is running\n"
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" --pid-file=PATH store the server's process ID in the given file\n"
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#if HAVE_NBD_DEVICE
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"\n"
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"Kernel NBD client support:\n"
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" -c, --connect=DEV connect FILE to the local NBD device DEV\n"
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" -d, --disconnect disconnect the specified device\n"
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#endif
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"\n"
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"Block device options:\n"
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" -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
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" -r, --read-only export read-only\n"
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" -s, --snapshot use FILE as an external snapshot, create a temporary\n"
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" file with backing_file=FILE, redirect the write to\n"
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" the temporary one\n"
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" -l, --load-snapshot=SNAPSHOT_PARAM\n"
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" load an internal snapshot inside FILE and export it\n"
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" as an read-only device, SNAPSHOT_PARAM format is\n"
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" 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
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" '[ID_OR_NAME]'\n"
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" -n, --nocache disable host cache\n"
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" --cache=MODE set cache mode used to access the disk image, the\n"
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" valid options are: 'none', 'writeback' (default),\n"
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" 'writethrough', 'directsync' and 'unsafe'\n"
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" --aio=MODE set AIO mode (native, io_uring or threads)\n"
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" --discard=MODE set discard mode (ignore, unmap)\n"
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" --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
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" --image-opts treat FILE as a full set of image options\n"
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"\n"
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QEMU_HELP_BOTTOM "\n"
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, name, name, NBD_DEFAULT_PORT, "DEVICE");
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}
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static void version(const char *name)
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{
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printf(
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"%s " QEMU_FULL_VERSION "\n"
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"Written by Anthony Liguori.\n"
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"\n"
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QEMU_COPYRIGHT "\n"
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"This is free software; see the source for copying conditions. There is NO\n"
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"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
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, name);
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}
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#ifdef CONFIG_POSIX
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/*
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* The client thread uses SIGTERM to interrupt the server. A signal
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* handler ensures that "qemu-nbd -v -c" exits with a nice status code.
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*/
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void qemu_system_killed(int signum, pid_t pid)
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{
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qatomic_cmpxchg(&state, RUNNING, TERMINATE);
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qemu_notify_event();
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}
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#endif /* CONFIG_POSIX */
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static int qemu_nbd_client_list(SocketAddress *saddr, QCryptoTLSCreds *tls,
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const char *hostname)
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{
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int ret = EXIT_FAILURE;
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int rc;
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Error *err = NULL;
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QIOChannelSocket *sioc;
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NBDExportInfo *list;
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int i, j;
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sioc = qio_channel_socket_new();
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if (qio_channel_socket_connect_sync(sioc, saddr, &err) < 0) {
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error_report_err(err);
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goto out;
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}
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rc = nbd_receive_export_list(QIO_CHANNEL(sioc), tls, hostname, &list,
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&err);
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if (rc < 0) {
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if (err) {
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error_report_err(err);
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}
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goto out;
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}
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printf("exports available: %d\n", rc);
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for (i = 0; i < rc; i++) {
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printf(" export: '%s'\n", list[i].name);
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if (list[i].description && *list[i].description) {
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printf(" description: %s\n", list[i].description);
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}
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if (list[i].flags & NBD_FLAG_HAS_FLAGS) {
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static const char *const flag_names[] = {
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[NBD_FLAG_READ_ONLY_BIT] = "readonly",
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[NBD_FLAG_SEND_FLUSH_BIT] = "flush",
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[NBD_FLAG_SEND_FUA_BIT] = "fua",
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[NBD_FLAG_ROTATIONAL_BIT] = "rotational",
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[NBD_FLAG_SEND_TRIM_BIT] = "trim",
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[NBD_FLAG_SEND_WRITE_ZEROES_BIT] = "zeroes",
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[NBD_FLAG_SEND_DF_BIT] = "df",
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[NBD_FLAG_CAN_MULTI_CONN_BIT] = "multi",
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[NBD_FLAG_SEND_RESIZE_BIT] = "resize",
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[NBD_FLAG_SEND_CACHE_BIT] = "cache",
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[NBD_FLAG_SEND_FAST_ZERO_BIT] = "fast-zero",
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};
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printf(" size: %" PRIu64 "\n", list[i].size);
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printf(" flags: 0x%x (", list[i].flags);
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for (size_t bit = 0; bit < ARRAY_SIZE(flag_names); bit++) {
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if (flag_names[bit] && (list[i].flags & (1 << bit))) {
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printf(" %s", flag_names[bit]);
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}
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}
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printf(" )\n");
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}
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if (list[i].min_block) {
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printf(" min block: %u\n", list[i].min_block);
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printf(" opt block: %u\n", list[i].opt_block);
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printf(" max block: %u\n", list[i].max_block);
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}
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if (list[i].n_contexts) {
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printf(" available meta contexts: %d\n", list[i].n_contexts);
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for (j = 0; j < list[i].n_contexts; j++) {
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printf(" %s\n", list[i].contexts[j]);
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}
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}
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}
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nbd_free_export_list(list, rc);
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ret = EXIT_SUCCESS;
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out:
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object_unref(OBJECT(sioc));
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return ret;
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}
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#if HAVE_NBD_DEVICE
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static void *show_parts(void *arg)
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{
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char *device = arg;
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int nbd;
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/* linux just needs an open() to trigger
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* the partition table update
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* but remember to load the module with max_part != 0 :
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* modprobe nbd max_part=63
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*/
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nbd = open(device, O_RDWR);
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if (nbd >= 0) {
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close(nbd);
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}
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return NULL;
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}
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static void *nbd_client_thread(void *arg)
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{
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char *device = arg;
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NBDExportInfo info = { .request_sizes = false, .name = g_strdup("") };
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QIOChannelSocket *sioc;
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int fd = -1;
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int ret = EXIT_FAILURE;
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pthread_t show_parts_thread;
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Error *local_error = NULL;
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sioc = qio_channel_socket_new();
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if (qio_channel_socket_connect_sync(sioc,
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saddr,
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&local_error) < 0) {
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error_report_err(local_error);
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goto out;
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}
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if (nbd_receive_negotiate(NULL, QIO_CHANNEL(sioc),
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NULL, NULL, NULL, &info, &local_error) < 0) {
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if (local_error) {
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error_report_err(local_error);
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}
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goto out;
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}
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fd = open(device, O_RDWR);
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if (fd < 0) {
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/* Linux-only, we can use %m in printf. */
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error_report("Failed to open %s: %m", device);
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goto out;
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}
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if (nbd_init(fd, sioc, &info, &local_error) < 0) {
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error_report_err(local_error);
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goto out;
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}
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/* update partition table */
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pthread_create(&show_parts_thread, NULL, show_parts, device);
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if (verbose) {
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fprintf(stderr, "NBD device %s is now connected to %s\n",
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device, srcpath);
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} else {
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/* Close stderr so that the qemu-nbd process exits. */
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dup2(STDOUT_FILENO, STDERR_FILENO);
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}
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if (nbd_client(fd) < 0) {
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goto out;
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}
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ret = EXIT_SUCCESS;
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out:
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if (fd >= 0) {
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close(fd);
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}
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object_unref(OBJECT(sioc));
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g_free(info.name);
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kill(getpid(), SIGTERM);
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return (void *) (intptr_t) ret;
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}
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#endif /* HAVE_NBD_DEVICE */
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static int nbd_can_accept(void)
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{
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return state == RUNNING && (shared == 0 || nb_fds < shared);
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}
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static void nbd_update_server_watch(void);
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static void nbd_client_closed(NBDClient *client, bool negotiated)
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{
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nb_fds--;
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if (negotiated && nb_fds == 0 && !persistent && state == RUNNING) {
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state = TERMINATE;
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}
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nbd_update_server_watch();
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nbd_client_put(client);
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}
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static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc,
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gpointer opaque)
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{
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if (state >= TERMINATE) {
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return;
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}
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nb_fds++;
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nbd_update_server_watch();
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nbd_client_new(cioc, tlscreds, tlsauthz, nbd_client_closed);
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}
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static void nbd_update_server_watch(void)
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{
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if (nbd_can_accept()) {
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qio_net_listener_set_client_func(server, nbd_accept, NULL, NULL);
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} else {
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qio_net_listener_set_client_func(server, NULL, NULL, NULL);
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}
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}
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static SocketAddress *nbd_build_socket_address(const char *sockpath,
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const char *bindto,
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const char *port)
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{
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SocketAddress *saddr;
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saddr = g_new0(SocketAddress, 1);
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if (sockpath) {
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saddr->type = SOCKET_ADDRESS_TYPE_UNIX;
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saddr->u.q_unix.path = g_strdup(sockpath);
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} else {
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InetSocketAddress *inet;
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saddr->type = SOCKET_ADDRESS_TYPE_INET;
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inet = &saddr->u.inet;
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inet->host = g_strdup(bindto);
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if (port) {
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inet->port = g_strdup(port);
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} else {
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inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
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}
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}
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return saddr;
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}
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|
|
|
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static QemuOptsList file_opts = {
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.name = "file",
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.implied_opt_name = "file",
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.head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
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.desc = {
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/* no elements => accept any params */
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{ /* end of list */ }
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},
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};
|
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|
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static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, bool list,
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Error **errp)
|
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{
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Object *obj;
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QCryptoTLSCreds *creds;
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|
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obj = object_resolve_path_component(
|
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object_get_objects_root(), id);
|
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if (!obj) {
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error_setg(errp, "No TLS credentials with id '%s'",
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id);
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return NULL;
|
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}
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creds = (QCryptoTLSCreds *)
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object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
|
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if (!creds) {
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error_setg(errp, "Object with id '%s' is not TLS credentials",
|
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id);
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return NULL;
|
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}
|
|
|
|
if (!qcrypto_tls_creds_check_endpoint(creds,
|
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list
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? QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT
|
|
: QCRYPTO_TLS_CREDS_ENDPOINT_SERVER,
|
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errp)) {
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return NULL;
|
|
}
|
|
object_ref(obj);
|
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return creds;
|
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}
|
|
|
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static void setup_address_and_port(const char **address, const char **port)
|
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{
|
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if (*address == NULL) {
|
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*address = "0.0.0.0";
|
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}
|
|
|
|
if (*port == NULL) {
|
|
*port = stringify(NBD_DEFAULT_PORT);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check socket parameters compatibility when socket activation is used.
|
|
*/
|
|
static const char *socket_activation_validate_opts(const char *device,
|
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const char *sockpath,
|
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const char *address,
|
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const char *port,
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bool list)
|
|
{
|
|
if (device != NULL) {
|
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return "NBD device can't be set when using socket activation";
|
|
}
|
|
|
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if (sockpath != NULL) {
|
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return "Unix socket can't be set when using socket activation";
|
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}
|
|
|
|
if (address != NULL) {
|
|
return "The interface can't be set when using socket activation";
|
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}
|
|
|
|
if (port != NULL) {
|
|
return "TCP port number can't be set when using socket activation";
|
|
}
|
|
|
|
if (list) {
|
|
return "List mode is incompatible with socket activation";
|
|
}
|
|
|
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return NULL;
|
|
}
|
|
|
|
static void qemu_nbd_shutdown(void)
|
|
{
|
|
job_cancel_sync_all();
|
|
blk_exp_close_all();
|
|
bdrv_close_all();
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
BlockBackend *blk;
|
|
BlockDriverState *bs;
|
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uint64_t dev_offset = 0;
|
|
bool readonly = false;
|
|
bool disconnect = false;
|
|
const char *bindto = NULL;
|
|
const char *port = NULL;
|
|
char *sockpath = NULL;
|
|
char *device = NULL;
|
|
QemuOpts *sn_opts = NULL;
|
|
const char *sn_id_or_name = NULL;
|
|
const char *sopt = "hVb:o:p:rsnc:dvk:e:f:tl:x:T:D:AB:L";
|
|
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' },
|
|
{ "allocation-depth", no_argument, NULL, 'A' },
|
|
{ "bitmap", required_argument, NULL, 'B' },
|
|
{ "connect", required_argument, NULL, 'c' },
|
|
{ "disconnect", no_argument, NULL, 'd' },
|
|
{ "list", no_argument, NULL, 'L' },
|
|
{ "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' },
|
|
{ "description", required_argument, NULL, 'D' },
|
|
{ "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS },
|
|
{ "tls-authz", required_argument, NULL, QEMU_NBD_OPT_TLSAUTHZ },
|
|
{ "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
|
|
{ "trace", required_argument, NULL, 'T' },
|
|
{ "fork", no_argument, NULL, QEMU_NBD_OPT_FORK },
|
|
{ "pid-file", required_argument, NULL, QEMU_NBD_OPT_PID_FILE },
|
|
{ NULL, 0, NULL, 0 }
|
|
};
|
|
int ch;
|
|
int opt_ind = 0;
|
|
int flags = BDRV_O_RDWR;
|
|
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; /* defaults to "" later for server mode */
|
|
const char *export_description = NULL;
|
|
strList *bitmaps = NULL;
|
|
bool alloc_depth = false;
|
|
const char *tlscredsid = NULL;
|
|
bool imageOpts = false;
|
|
bool writethrough = false; /* Client will flush as needed. */
|
|
bool fork_process = false;
|
|
bool list = false;
|
|
int old_stderr = -1;
|
|
unsigned socket_activation;
|
|
const char *pid_file_name = NULL;
|
|
BlockExportOptions *export_opts;
|
|
|
|
#ifdef CONFIG_POSIX
|
|
os_setup_early_signal_handling();
|
|
os_setup_signal_handling();
|
|
#endif
|
|
|
|
socket_init();
|
|
error_init(argv[0]);
|
|
module_call_init(MODULE_INIT_TRACE);
|
|
qcrypto_init(&error_fatal);
|
|
|
|
module_call_init(MODULE_INIT_QOM);
|
|
qemu_add_opts(&qemu_trace_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 (bdrv_parse_aio(optarg, &flags) < 0) {
|
|
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_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':
|
|
if (qemu_strtou64(optarg, NULL, 0, &dev_offset) < 0) {
|
|
error_report("Invalid offset '%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':
|
|
readonly = true;
|
|
flags &= ~BDRV_O_RDWR;
|
|
break;
|
|
case 'A':
|
|
alloc_depth = true;
|
|
break;
|
|
case 'B':
|
|
QAPI_LIST_PREPEND(bitmaps, g_strdup(optarg));
|
|
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':
|
|
if (qemu_strtoi(optarg, NULL, 0, &shared) < 0 ||
|
|
shared < 0) {
|
|
error_report("Invalid shared device number '%s'", optarg);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
break;
|
|
case 'f':
|
|
fmt = optarg;
|
|
break;
|
|
case 't':
|
|
persistent = 1;
|
|
break;
|
|
case 'x':
|
|
export_name = optarg;
|
|
if (strlen(export_name) > NBD_MAX_STRING_SIZE) {
|
|
error_report("export name '%s' too long", export_name);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
break;
|
|
case 'D':
|
|
export_description = optarg;
|
|
if (strlen(export_description) > NBD_MAX_STRING_SIZE) {
|
|
error_report("export description '%s' too long",
|
|
export_description);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
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:
|
|
user_creatable_process_cmdline(optarg);
|
|
break;
|
|
case QEMU_NBD_OPT_TLSCREDS:
|
|
tlscredsid = optarg;
|
|
break;
|
|
case QEMU_NBD_OPT_IMAGE_OPTS:
|
|
imageOpts = true;
|
|
break;
|
|
case 'T':
|
|
trace_opt_parse(optarg);
|
|
break;
|
|
case QEMU_NBD_OPT_TLSAUTHZ:
|
|
tlsauthz = optarg;
|
|
break;
|
|
case QEMU_NBD_OPT_FORK:
|
|
fork_process = true;
|
|
break;
|
|
case 'L':
|
|
list = true;
|
|
break;
|
|
case QEMU_NBD_OPT_PID_FILE:
|
|
pid_file_name = optarg;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (list) {
|
|
if (argc != optind) {
|
|
error_report("List mode is incompatible with a file name");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
if (export_name || export_description || dev_offset ||
|
|
device || disconnect || fmt || sn_id_or_name || bitmaps ||
|
|
alloc_depth || seen_aio || seen_discard || seen_cache) {
|
|
error_report("List mode is incompatible with per-device settings");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
if (fork_process) {
|
|
error_report("List mode is incompatible with forking");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
} else if ((argc - optind) != 1) {
|
|
error_report("Invalid number of arguments");
|
|
error_printf("Try `%s --help' for more information.\n", argv[0]);
|
|
exit(EXIT_FAILURE);
|
|
} else if (!export_name) {
|
|
export_name = "";
|
|
}
|
|
|
|
if (!trace_init_backends()) {
|
|
exit(1);
|
|
}
|
|
trace_init_file();
|
|
qemu_set_log(LOG_TRACE);
|
|
|
|
socket_activation = check_socket_activation();
|
|
if (socket_activation == 0) {
|
|
setup_address_and_port(&bindto, &port);
|
|
} else {
|
|
/* Using socket activation - check user didn't use -p etc. */
|
|
const char *err_msg = socket_activation_validate_opts(device, sockpath,
|
|
bindto, port,
|
|
list);
|
|
if (err_msg != NULL) {
|
|
error_report("%s", err_msg);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
/* qemu-nbd can only listen on a single socket. */
|
|
if (socket_activation > 1) {
|
|
error_report("qemu-nbd does not support socket activation with %s > 1",
|
|
"LISTEN_FDS");
|
|
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 (tlsauthz && list) {
|
|
error_report("TLS authorization is incompatible with export list");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
tlscreds = nbd_get_tls_creds(tlscredsid, list, &local_err);
|
|
if (local_err) {
|
|
error_reportf_err(local_err, "Failed to get TLS creds: ");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
} else {
|
|
if (tlsauthz) {
|
|
error_report("--tls-authz is not permitted without --tls-creds");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
}
|
|
|
|
if (list) {
|
|
saddr = nbd_build_socket_address(sockpath, bindto, port);
|
|
return qemu_nbd_client_list(saddr, tlscreds, bindto);
|
|
}
|
|
|
|
#if !HAVE_NBD_DEVICE
|
|
if (disconnect || device) {
|
|
error_report("Kernel /dev/nbdN support not available");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
#else /* HAVE_NBD_DEVICE */
|
|
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;
|
|
}
|
|
#endif
|
|
|
|
if ((device && !verbose) || fork_process) {
|
|
#ifndef WIN32
|
|
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]);
|
|
|
|
/* Remember parent's stderr if we will be restoring it. */
|
|
if (fork_process) {
|
|
old_stderr = dup(STDERR_FILENO);
|
|
}
|
|
|
|
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);
|
|
}
|
|
#else /* WIN32 */
|
|
error_report("Unable to fork into background on Windows hosts");
|
|
exit(EXIT_FAILURE);
|
|
#endif /* WIN32 */
|
|
}
|
|
|
|
if (device != NULL && sockpath == NULL) {
|
|
sockpath = g_malloc(128);
|
|
snprintf(sockpath, 128, SOCKET_PATH, basename(device));
|
|
}
|
|
|
|
server = qio_net_listener_new();
|
|
if (socket_activation == 0) {
|
|
int backlog;
|
|
|
|
if (persistent || shared == 0) {
|
|
backlog = SOMAXCONN;
|
|
} else {
|
|
backlog = MIN(shared, SOMAXCONN);
|
|
}
|
|
saddr = nbd_build_socket_address(sockpath, bindto, port);
|
|
if (qio_net_listener_open_sync(server, saddr, backlog,
|
|
&local_err) < 0) {
|
|
object_unref(OBJECT(server));
|
|
error_report_err(local_err);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
} else {
|
|
size_t i;
|
|
/* See comment in check_socket_activation above. */
|
|
for (i = 0; i < socket_activation; i++) {
|
|
QIOChannelSocket *sioc;
|
|
sioc = qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD + i,
|
|
&local_err);
|
|
if (sioc == NULL) {
|
|
object_unref(OBJECT(server));
|
|
error_reportf_err(local_err,
|
|
"Failed to use socket activation: ");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
qio_net_listener_add(server, sioc);
|
|
object_unref(OBJECT(sioc));
|
|
}
|
|
}
|
|
|
|
qemu_init_main_loop(&error_fatal);
|
|
bdrv_init();
|
|
atexit(qemu_nbd_shutdown);
|
|
|
|
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_str(options, "driver", 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);
|
|
|
|
if (dev_offset) {
|
|
QDict *raw_opts = qdict_new();
|
|
qdict_put_str(raw_opts, "driver", "raw");
|
|
qdict_put_str(raw_opts, "file", bs->node_name);
|
|
qdict_put_int(raw_opts, "offset", dev_offset);
|
|
bs = bdrv_open(NULL, NULL, raw_opts, flags, &error_fatal);
|
|
blk_remove_bs(blk);
|
|
blk_insert_bs(blk, bs, &error_fatal);
|
|
bdrv_unref(bs);
|
|
}
|
|
|
|
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;
|
|
|
|
nbd_server_is_qemu_nbd(true);
|
|
|
|
export_opts = g_new(BlockExportOptions, 1);
|
|
*export_opts = (BlockExportOptions) {
|
|
.type = BLOCK_EXPORT_TYPE_NBD,
|
|
.id = g_strdup("qemu-nbd-export"),
|
|
.node_name = g_strdup(bdrv_get_node_name(bs)),
|
|
.has_writethrough = true,
|
|
.writethrough = writethrough,
|
|
.has_writable = true,
|
|
.writable = !readonly,
|
|
.u.nbd = {
|
|
.has_name = true,
|
|
.name = g_strdup(export_name),
|
|
.has_description = !!export_description,
|
|
.description = g_strdup(export_description),
|
|
.has_bitmaps = !!bitmaps,
|
|
.bitmaps = bitmaps,
|
|
.has_allocation_depth = alloc_depth,
|
|
.allocation_depth = alloc_depth,
|
|
},
|
|
};
|
|
blk_exp_add(export_opts, &error_fatal);
|
|
qapi_free_BlockExportOptions(export_opts);
|
|
|
|
if (device) {
|
|
#if HAVE_NBD_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);
|
|
}
|
|
#endif
|
|
} else {
|
|
/* Shut up GCC warnings. */
|
|
memset(&client_thread, 0, sizeof(client_thread));
|
|
}
|
|
|
|
nbd_update_server_watch();
|
|
|
|
if (pid_file_name) {
|
|
qemu_write_pidfile(pid_file_name, &error_fatal);
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
|
|
if (fork_process) {
|
|
dup2(old_stderr, STDERR_FILENO);
|
|
close(old_stderr);
|
|
}
|
|
|
|
state = RUNNING;
|
|
do {
|
|
main_loop_wait(false);
|
|
if (state == TERMINATE) {
|
|
blk_exp_close_all();
|
|
state = TERMINATED;
|
|
}
|
|
} 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);
|
|
}
|
|
}
|