qemu/storage-daemon/qemu-storage-daemon.c
Sergio Lopez 1895b977f9 block: move blk_exp_close_all() to qemu_cleanup()
Move blk_exp_close_all() from bdrv_close() to qemu_cleanup(), before
bdrv_drain_all_begin().

Export drivers may have coroutines yielding at some point in the block
layer, so we need to shut them down before draining the block layer,
as otherwise they may get stuck blk_wait_while_drained().

RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=1900505
Signed-off-by: Sergio Lopez <slp@redhat.com>
Message-Id: <20210201125032.44713-3-slp@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2021-02-02 13:23:47 +01:00

327 lines
10 KiB
C

/*
* 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-common.h"
#include "qemu-version.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 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"
" --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"
" --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"
QEMU_HELP_BOTTOM "\n",
error_get_progname());
}
enum {
OPTION_BLOCKDEV = 256,
OPTION_CHARDEV,
OPTION_EXPORT,
OPTION_MONITOR,
OPTION_NBD_SERVER,
OPTION_OBJECT,
};
extern QemuOptsList qemu_chardev_opts;
static QemuOptsList qemu_object_opts = {
.name = "object",
.implied_opt_name = "qom-type",
.head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
.desc = {
{ }
},
};
static void init_qmp_commands(void)
{
qmp_init_marshal(&qmp_commands);
qmp_register_command(&qmp_commands, "query-qmp-schema",
qmp_query_qmp_schema, QCO_ALLOW_PRECONFIG);
QTAILQ_INIT(&qmp_cap_negotiation_commands);
qmp_register_command(&qmp_cap_negotiation_commands, "qmp_capabilities",
qmp_marshal_qmp_capabilities, QCO_ALLOW_PRECONFIG);
}
static void process_options(int argc, char *argv[])
{
int c;
static const struct option long_options[] = {
{"blockdev", required_argument, NULL, OPTION_BLOCKDEV},
{"chardev", required_argument, NULL, OPTION_CHARDEV},
{"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},
{"trace", required_argument, NULL, 'T'},
{"version", no_argument, NULL, 'V'},
{0, 0, 0, 0}
};
/*
* In contrast to the system emulator, 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.
*/
while ((c = getopt_long(argc, argv, "hT:V", long_options, NULL)) != -1) {
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_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:
{
QDict *args;
bool help;
args = keyval_parse(optarg, "qom-type", &help, &error_fatal);
if (help) {
user_creatable_print_help_from_qdict(args);
exit(EXIT_SUCCESS);
}
user_creatable_add_dict(args, true, &error_fatal);
qobject_unref(args);
break;
}
default:
g_assert_not_reached();
}
}
if (optind != argc) {
error_report("Unexpected argument: %s", argv[optind]);
exit(EXIT_FAILURE);
}
}
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();
module_call_init(MODULE_INIT_QOM);
module_call_init(MODULE_INIT_TRACE);
qemu_add_opts(&qemu_object_opts);
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);
qemu_init_main_loop(&error_fatal);
process_options(argc, argv);
while (!exit_requested) {
main_loop_wait(false);
}
blk_exp_close_all();
bdrv_drain_all_begin();
bdrv_close_all();
monitor_cleanup();
qemu_chr_cleanup();
user_creatable_cleanup();
return EXIT_SUCCESS;
}