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qemu-e2k/storage-daemon/qemu-storage-daemon.c

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/*
* QEMU storage daemon
*
* Copyright (c) 2003-2008 Fabrice Bellard
* Copyright (c) 2019 Kevin Wolf <kwolf@redhat.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include <getopt.h>
#include "block/block.h"
#include "block/nbd.h"
#include "chardev/char.h"
#include "crypto/init.h"
#include "monitor/monitor.h"
#include "monitor/monitor-internal.h"
#include "qapi/error.h"
#include "qapi/qapi-visit-block-core.h"
#include "qapi/qapi-visit-block-export.h"
#include "qapi/qapi-visit-control.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qstring.h"
#include "qapi/qobject-input-visitor.h"
#include "qemu/help-texts.h"
#include "qemu-version.h"
#include "qemu/cutils.h"
#include "qemu/config-file.h"
#include "qemu/error-report.h"
#include "qemu/help_option.h"
#include "qemu/log.h"
#include "qemu/main-loop.h"
#include "qemu/module.h"
#include "qemu/option.h"
#include "qom/object_interfaces.h"
#include "storage-daemon/qapi/qapi-commands.h"
#include "storage-daemon/qapi/qapi-init-commands.h"
#include "sysemu/runstate.h"
#include "trace/control.h"
static const char *pid_file;
static char *pid_file_realpath;
static volatile bool exit_requested = false;
void qemu_system_killed(int signal, pid_t pid)
{
exit_requested = true;
}
void qmp_quit(Error **errp)
{
exit_requested = true;
}
static void help(void)
{
printf(
"Usage: %s [options]\n"
"QEMU storage daemon\n"
"\n"
" -h, --help display this help and exit\n"
" -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
" specify tracing options\n"
" -V, --version output version information and exit\n"
"\n"
" --blockdev [driver=]<driver>[,node-name=<N>][,discard=ignore|unmap]\n"
" [,cache.direct=on|off][,cache.no-flush=on|off]\n"
" [,read-only=on|off][,auto-read-only=on|off]\n"
" [,force-share=on|off][,detect-zeroes=on|off|unmap]\n"
" [,driver specific parameters...]\n"
" configure a block backend\n"
"\n"
" --chardev <options> configure a character device backend\n"
" (see the qemu(1) man page for possible options)\n"
"\n"
" --daemonize daemonize the process, and have the parent exit\n"
" once startup is complete\n"
"\n"
" --export [type=]nbd,id=<id>,node-name=<node-name>[,name=<export-name>]\n"
" [,writable=on|off][,bitmap=<name>]\n"
" export the specified block node over NBD\n"
" (requires --nbd-server)\n"
"\n"
#ifdef CONFIG_FUSE
" --export [type=]fuse,id=<id>,node-name=<node-name>,mountpoint=<file>\n"
" [,growable=on|off][,writable=on|off][,allow-other=on|off|auto]\n"
" export the specified block node over FUSE\n"
"\n"
#endif /* CONFIG_FUSE */
#ifdef CONFIG_VHOST_USER_BLK_SERVER
" --export [type=]vhost-user-blk,id=<id>,node-name=<node-name>,\n"
" addr.type=unix,addr.path=<socket-path>[,writable=on|off]\n"
" [,logical-block-size=<block-size>][,num-queues=<num-queues>]\n"
" export the specified block node as a\n"
" vhost-user-blk device over UNIX domain socket\n"
" --export [type=]vhost-user-blk,id=<id>,node-name=<node-name>,\n"
" addr.type=fd,addr.str=<fd>[,writable=on|off]\n"
" [,logical-block-size=<block-size>][,num-queues=<num-queues>]\n"
" export the specified block node as a\n"
" vhost-user-blk device over file descriptor\n"
"\n"
#endif /* CONFIG_VHOST_USER_BLK_SERVER */
#ifdef CONFIG_VDUSE_BLK_EXPORT
" --export [type=]vduse-blk,id=<id>,node-name=<node-name>\n"
" ,name=<vduse-name>[,writable=on|off]\n"
" [,num-queues=<num-queues>][,queue-size=<queue-size>]\n"
" [,logical-block-size=<logical-block-size>]\n"
" [,serial=<serial-number>]\n"
" export the specified block node as a\n"
" vduse-blk device\n"
"\n"
#endif /* CONFIG_VDUSE_BLK_EXPORT */
" --monitor [chardev=]name[,mode=control][,pretty[=on|off]]\n"
" configure a QMP monitor\n"
"\n"
" --nbd-server addr.type=inet,addr.host=<host>,addr.port=<port>\n"
" [,tls-creds=<id>][,tls-authz=<id>][,max-connections=<n>]\n"
" --nbd-server addr.type=unix,addr.path=<path>\n"
" [,tls-creds=<id>][,tls-authz=<id>][,max-connections=<n>]\n"
" start an NBD server for exporting block nodes\n"
"\n"
" --object help list object types that can be added\n"
" --object <type>,help list properties for the given object type\n"
" --object <type>[,<property>=<value>...]\n"
" create a new object of type <type>, setting\n"
" properties in the order they are specified. Note\n"
" that the 'id' property must be set.\n"
" See the qemu(1) man page for documentation of the\n"
" objects that can be added.\n"
"\n"
" --pidfile <path> write process ID to a file after startup\n"
"\n"
QEMU_HELP_BOTTOM "\n",
g_get_prgname());
}
enum {
OPTION_BLOCKDEV = 256,
OPTION_CHARDEV,
OPTION_DAEMONIZE,
OPTION_EXPORT,
OPTION_MONITOR,
OPTION_NBD_SERVER,
OPTION_OBJECT,
OPTION_PIDFILE,
};
extern QemuOptsList qemu_chardev_opts;
static void init_qmp_commands(void)
{
qmp_init_marshal(&qmp_commands);
QTAILQ_INIT(&qmp_cap_negotiation_commands);
qmp_register_command(&qmp_cap_negotiation_commands, "qmp_capabilities",
qmp_marshal_qmp_capabilities,
QCO_ALLOW_PRECONFIG, 0);
}
static int getopt_set_loc(int argc, char **argv, const char *optstring,
const struct option *longopts)
{
int c, save_index;
optarg = NULL;
save_index = optind;
c = getopt_long(argc, argv, optstring, longopts, NULL);
if (optarg) {
loc_set_cmdline(argv, save_index, MAX(1, optind - save_index));
}
return c;
}
/**
* Process QSD command-line arguments.
*
* This is done in two passes:
*
* First (@pre_init_pass is true), we do a pass where all global
* arguments pertaining to the QSD process (like --help or --daemonize)
* are processed. This pass is done before most of the QEMU-specific
* initialization steps (e.g. initializing the block layer or QMP), and
* so must only process arguments that are not really QEMU-specific.
*
* Second (@pre_init_pass is false), we (sequentially) process all
* QEMU/QSD-specific arguments. Many of these arguments are effectively
* translated to QMP commands (like --blockdev for blockdev-add, or
* --export for block-export-add).
*/
static void process_options(int argc, char *argv[], bool pre_init_pass)
{
int c;
static const struct option long_options[] = {
{"blockdev", required_argument, NULL, OPTION_BLOCKDEV},
{"chardev", required_argument, NULL, OPTION_CHARDEV},
{"daemonize", no_argument, NULL, OPTION_DAEMONIZE},
{"export", required_argument, NULL, OPTION_EXPORT},
{"help", no_argument, NULL, 'h'},
{"monitor", required_argument, NULL, OPTION_MONITOR},
{"nbd-server", required_argument, NULL, OPTION_NBD_SERVER},
{"object", required_argument, NULL, OPTION_OBJECT},
{"pidfile", required_argument, NULL, OPTION_PIDFILE},
{"trace", required_argument, NULL, 'T'},
{"version", no_argument, NULL, 'V'},
{0, 0, 0, 0}
};
/*
* In contrast to the system emulator, QEMU-specific options are processed
* in the order they are given on the command lines. This means that things
* must be defined first before they can be referenced in another option.
*/
optind = 1;
while ((c = getopt_set_loc(argc, argv, "-hT:V", long_options)) != -1) {
bool handle_option_pre_init;
/* Should this argument be processed in the pre-init pass? */
handle_option_pre_init =
c == '?' ||
c == 'h' ||
c == 'V' ||
c == OPTION_DAEMONIZE ||
c == OPTION_PIDFILE;
/* Process every option only in its respective pass */
if (pre_init_pass != handle_option_pre_init) {
continue;
}
switch (c) {
case '?':
exit(EXIT_FAILURE);
case 'h':
help();
exit(EXIT_SUCCESS);
case 'T':
trace_opt_parse(optarg);
trace_init_file();
break;
case 'V':
printf("qemu-storage-daemon version "
QEMU_FULL_VERSION "\n" QEMU_COPYRIGHT "\n");
exit(EXIT_SUCCESS);
case OPTION_BLOCKDEV:
{
Visitor *v;
BlockdevOptions *options;
v = qobject_input_visitor_new_str(optarg, "driver",
&error_fatal);
visit_type_BlockdevOptions(v, NULL, &options, &error_fatal);
visit_free(v);
qmp_blockdev_add(options, &error_fatal);
qapi_free_BlockdevOptions(options);
break;
}
case OPTION_CHARDEV:
{
/* TODO This interface is not stable until we QAPIfy it */
QemuOpts *opts = qemu_opts_parse_noisily(&qemu_chardev_opts,
optarg, true);
if (opts == NULL) {
exit(EXIT_FAILURE);
}
if (!qemu_chr_new_from_opts(opts, NULL, &error_fatal)) {
/* No error, but NULL returned means help was printed */
exit(EXIT_SUCCESS);
}
qemu_opts_del(opts);
break;
}
case OPTION_DAEMONIZE:
if (os_set_daemonize(true) < 0) {
/*
* --daemonize is parsed before monitor_init_globals_core(), so
* error_report() does not work yet
*/
fprintf(stderr, "--daemonize not supported in this build\n");
exit(EXIT_FAILURE);
}
break;
case OPTION_EXPORT:
{
Visitor *v;
BlockExportOptions *export;
v = qobject_input_visitor_new_str(optarg, "type", &error_fatal);
visit_type_BlockExportOptions(v, NULL, &export, &error_fatal);
visit_free(v);
qmp_block_export_add(export, &error_fatal);
qapi_free_BlockExportOptions(export);
break;
}
case OPTION_MONITOR:
{
Visitor *v;
MonitorOptions *monitor;
v = qobject_input_visitor_new_str(optarg, "chardev",
&error_fatal);
visit_type_MonitorOptions(v, NULL, &monitor, &error_fatal);
visit_free(v);
/* TODO Catch duplicate monitor IDs */
monitor_init(monitor, false, &error_fatal);
qapi_free_MonitorOptions(monitor);
break;
}
case OPTION_NBD_SERVER:
{
Visitor *v;
NbdServerOptions *options;
v = qobject_input_visitor_new_str(optarg, NULL, &error_fatal);
visit_type_NbdServerOptions(v, NULL, &options, &error_fatal);
visit_free(v);
nbd_server_start_options(options, &error_fatal);
qapi_free_NbdServerOptions(options);
break;
}
case OPTION_OBJECT:
user_creatable_process_cmdline(optarg);
break;
case OPTION_PIDFILE:
pid_file = optarg;
break;
case 1:
error_report("Unexpected argument");
exit(EXIT_FAILURE);
default:
g_assert_not_reached();
}
}
loc_set_none();
}
static void pid_file_cleanup(void)
{
unlink(pid_file_realpath);
}
static void pid_file_init(void)
{
Error *err = NULL;
if (!pid_file) {
return;
}
if (!qemu_write_pidfile(pid_file, &err)) {
error_reportf_err(err, "cannot create PID file: ");
exit(EXIT_FAILURE);
}
pid_file_realpath = g_malloc(PATH_MAX);
if (!realpath(pid_file, pid_file_realpath)) {
error_report("cannot resolve PID file path: %s: %s",
pid_file, strerror(errno));
unlink(pid_file);
exit(EXIT_FAILURE);
}
atexit(pid_file_cleanup);
}
int main(int argc, char *argv[])
{
#ifdef CONFIG_POSIX
signal(SIGPIPE, SIG_IGN);
#endif
error_init(argv[0]);
qemu_init_exec_dir(argv[0]);
os_setup_signal_handling();
process_options(argc, argv, true);
os_daemonize();
module_call_init(MODULE_INIT_QOM);
module_call_init(MODULE_INIT_TRACE);
qemu_add_opts(&qemu_trace_opts);
qcrypto_init(&error_fatal);
bdrv_init();
monitor_init_globals_core();
init_qmp_commands();
if (!trace_init_backends()) {
return EXIT_FAILURE;
}
qemu_set_log(LOG_TRACE, &error_fatal);
qemu_init_main_loop(&error_fatal);
process_options(argc, argv, false);
/*
* Write the pid file after creating chardevs, exports, and NBD servers but
* before accepting connections. This ordering is documented. Do not change
* it.
*/
pid_file_init();
os_setup_post();
while (!exit_requested) {
main_loop_wait(false);
}
blk_exp_close_all();
bdrv_drain_all_begin();
job_cancel_sync_all();
bdrv_close_all();
monitor_cleanup();
qemu_chr_cleanup();
user_creatable_cleanup();
return EXIT_SUCCESS;
}
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