9151e59a8b
This converts object-add from 'gen': false to the ObjectOptions QAPI type. As an immediate benefit, clients can now use QAPI schema introspection for user creatable QOM objects. It is also the first step towards making the QAPI schema the only external interface for the creation of user creatable objects. Once all other places (HMP and command lines of the system emulator and all tools) go through QAPI, too, some object implementations can be simplified because some checks (e.g. that mandatory options are set) are already performed by QAPI, and in another step, QOM boilerplate code could be generated from the schema. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Acked-by: Peter Krempa <pkrempa@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
378 lines
12 KiB
C
378 lines
12 KiB
C
/*
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* QEMU storage daemon
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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* Copyright (c) 2019 Kevin Wolf <kwolf@redhat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include <getopt.h>
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#include "block/block.h"
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#include "block/nbd.h"
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#include "chardev/char.h"
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#include "crypto/init.h"
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#include "monitor/monitor.h"
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#include "monitor/monitor-internal.h"
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#include "qapi/error.h"
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#include "qapi/qapi-visit-block-core.h"
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#include "qapi/qapi-visit-block-export.h"
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#include "qapi/qapi-visit-control.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/qmp/qstring.h"
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#include "qapi/qobject-input-visitor.h"
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#include "qemu-common.h"
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#include "qemu-version.h"
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#include "qemu/config-file.h"
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#include "qemu/error-report.h"
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#include "qemu/help_option.h"
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#include "qemu/log.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 "qom/object_interfaces.h"
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#include "storage-daemon/qapi/qapi-commands.h"
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#include "storage-daemon/qapi/qapi-init-commands.h"
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#include "sysemu/runstate.h"
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#include "trace/control.h"
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static const char *pid_file;
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static volatile bool exit_requested = false;
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void qemu_system_killed(int signal, pid_t pid)
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{
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exit_requested = true;
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}
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void qmp_quit(Error **errp)
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{
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exit_requested = true;
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}
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static void help(void)
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{
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printf(
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"Usage: %s [options]\n"
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"QEMU storage daemon\n"
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"\n"
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" -h, --help display this help and exit\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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" -V, --version output version information and exit\n"
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"\n"
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" --blockdev [driver=]<driver>[,node-name=<N>][,discard=ignore|unmap]\n"
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" [,cache.direct=on|off][,cache.no-flush=on|off]\n"
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" [,read-only=on|off][,auto-read-only=on|off]\n"
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" [,force-share=on|off][,detect-zeroes=on|off|unmap]\n"
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" [,driver specific parameters...]\n"
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" configure a block backend\n"
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"\n"
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" --chardev <options> configure a character device backend\n"
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" (see the qemu(1) man page for possible options)\n"
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"\n"
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" --export [type=]nbd,id=<id>,node-name=<node-name>[,name=<export-name>]\n"
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" [,writable=on|off][,bitmap=<name>]\n"
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" export the specified block node over NBD\n"
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" (requires --nbd-server)\n"
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"\n"
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" --monitor [chardev=]name[,mode=control][,pretty[=on|off]]\n"
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" configure a QMP monitor\n"
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"\n"
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" --nbd-server addr.type=inet,addr.host=<host>,addr.port=<port>\n"
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" [,tls-creds=<id>][,tls-authz=<id>][,max-connections=<n>]\n"
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" --nbd-server addr.type=unix,addr.path=<path>\n"
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" [,tls-creds=<id>][,tls-authz=<id>][,max-connections=<n>]\n"
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" start an NBD server for exporting block nodes\n"
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"\n"
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" --object help list object types that can be added\n"
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" --object <type>,help list properties for the given object type\n"
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" --object <type>[,<property>=<value>...]\n"
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" create a new object of type <type>, setting\n"
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" properties in the order they are specified. Note\n"
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" that the 'id' property must be set.\n"
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" See the qemu(1) man page for documentation of the\n"
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" objects that can be added.\n"
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"\n"
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" --pidfile <path> write process ID to a file after startup\n"
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"\n"
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QEMU_HELP_BOTTOM "\n",
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error_get_progname());
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}
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enum {
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OPTION_BLOCKDEV = 256,
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OPTION_CHARDEV,
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OPTION_EXPORT,
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OPTION_MONITOR,
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OPTION_NBD_SERVER,
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OPTION_OBJECT,
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OPTION_PIDFILE,
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};
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extern QemuOptsList qemu_chardev_opts;
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static QemuOptsList qemu_object_opts = {
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.name = "object",
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.implied_opt_name = "qom-type",
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.head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
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.desc = {
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{ }
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},
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};
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static void init_qmp_commands(void)
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{
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qmp_init_marshal(&qmp_commands);
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qmp_register_command(&qmp_commands, "query-qmp-schema",
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qmp_query_qmp_schema, QCO_ALLOW_PRECONFIG);
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QTAILQ_INIT(&qmp_cap_negotiation_commands);
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qmp_register_command(&qmp_cap_negotiation_commands, "qmp_capabilities",
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qmp_marshal_qmp_capabilities, QCO_ALLOW_PRECONFIG);
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}
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static int getopt_set_loc(int argc, char **argv, const char *optstring,
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const struct option *longopts)
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{
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int c, save_index;
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optarg = NULL;
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save_index = optind;
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c = getopt_long(argc, argv, optstring, longopts, NULL);
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if (optarg) {
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loc_set_cmdline(argv, save_index, MAX(1, optind - save_index));
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}
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return c;
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}
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static void process_options(int argc, char *argv[])
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{
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int c;
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static const struct option long_options[] = {
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{"blockdev", required_argument, NULL, OPTION_BLOCKDEV},
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{"chardev", required_argument, NULL, OPTION_CHARDEV},
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{"export", required_argument, NULL, OPTION_EXPORT},
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{"help", no_argument, NULL, 'h'},
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{"monitor", required_argument, NULL, OPTION_MONITOR},
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{"nbd-server", required_argument, NULL, OPTION_NBD_SERVER},
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{"object", required_argument, NULL, OPTION_OBJECT},
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{"pidfile", required_argument, NULL, OPTION_PIDFILE},
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{"trace", required_argument, NULL, 'T'},
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{"version", no_argument, NULL, 'V'},
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{0, 0, 0, 0}
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};
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/*
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* In contrast to the system emulator, options are processed in the order
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* they are given on the command lines. This means that things must be
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* defined first before they can be referenced in another option.
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*/
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while ((c = getopt_set_loc(argc, argv, "-hT:V", long_options)) != -1) {
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switch (c) {
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case '?':
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exit(EXIT_FAILURE);
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case 'h':
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help();
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exit(EXIT_SUCCESS);
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case 'T':
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trace_opt_parse(optarg);
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trace_init_file();
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break;
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case 'V':
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printf("qemu-storage-daemon version "
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QEMU_FULL_VERSION "\n" QEMU_COPYRIGHT "\n");
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exit(EXIT_SUCCESS);
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case OPTION_BLOCKDEV:
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{
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Visitor *v;
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BlockdevOptions *options;
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v = qobject_input_visitor_new_str(optarg, "driver",
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&error_fatal);
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visit_type_BlockdevOptions(v, NULL, &options, &error_fatal);
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visit_free(v);
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qmp_blockdev_add(options, &error_fatal);
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qapi_free_BlockdevOptions(options);
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break;
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}
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case OPTION_CHARDEV:
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{
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/* TODO This interface is not stable until we QAPIfy it */
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QemuOpts *opts = qemu_opts_parse_noisily(&qemu_chardev_opts,
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optarg, true);
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if (opts == NULL) {
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exit(EXIT_FAILURE);
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}
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if (!qemu_chr_new_from_opts(opts, NULL, &error_fatal)) {
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/* No error, but NULL returned means help was printed */
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exit(EXIT_SUCCESS);
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}
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qemu_opts_del(opts);
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break;
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}
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case OPTION_EXPORT:
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{
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Visitor *v;
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BlockExportOptions *export;
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v = qobject_input_visitor_new_str(optarg, "type", &error_fatal);
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visit_type_BlockExportOptions(v, NULL, &export, &error_fatal);
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visit_free(v);
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qmp_block_export_add(export, &error_fatal);
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qapi_free_BlockExportOptions(export);
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break;
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}
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case OPTION_MONITOR:
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{
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Visitor *v;
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MonitorOptions *monitor;
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v = qobject_input_visitor_new_str(optarg, "chardev",
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&error_fatal);
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visit_type_MonitorOptions(v, NULL, &monitor, &error_fatal);
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visit_free(v);
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/* TODO Catch duplicate monitor IDs */
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monitor_init(monitor, false, &error_fatal);
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qapi_free_MonitorOptions(monitor);
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break;
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}
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case OPTION_NBD_SERVER:
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{
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Visitor *v;
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NbdServerOptions *options;
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v = qobject_input_visitor_new_str(optarg, NULL, &error_fatal);
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visit_type_NbdServerOptions(v, NULL, &options, &error_fatal);
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visit_free(v);
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nbd_server_start_options(options, &error_fatal);
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qapi_free_NbdServerOptions(options);
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break;
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}
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case OPTION_OBJECT:
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{
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QDict *args;
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bool help;
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args = keyval_parse(optarg, "qom-type", &help, &error_fatal);
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if (help) {
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user_creatable_print_help_from_qdict(args);
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exit(EXIT_SUCCESS);
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}
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user_creatable_add_dict(args, true, &error_fatal);
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qobject_unref(args);
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break;
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}
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case OPTION_PIDFILE:
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pid_file = optarg;
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break;
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case 1:
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error_report("Unexpected argument");
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exit(EXIT_FAILURE);
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default:
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g_assert_not_reached();
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}
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}
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loc_set_none();
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}
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static void pid_file_cleanup(void)
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{
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unlink(pid_file);
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}
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static void pid_file_init(void)
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{
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Error *err = NULL;
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if (!pid_file) {
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return;
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}
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if (!qemu_write_pidfile(pid_file, &err)) {
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error_reportf_err(err, "cannot create PID file: ");
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exit(EXIT_FAILURE);
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}
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atexit(pid_file_cleanup);
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}
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int main(int argc, char *argv[])
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{
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#ifdef CONFIG_POSIX
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signal(SIGPIPE, SIG_IGN);
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#endif
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error_init(argv[0]);
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qemu_init_exec_dir(argv[0]);
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os_setup_signal_handling();
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module_call_init(MODULE_INIT_QOM);
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module_call_init(MODULE_INIT_TRACE);
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qemu_add_opts(&qemu_object_opts);
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qemu_add_opts(&qemu_trace_opts);
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qcrypto_init(&error_fatal);
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bdrv_init();
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monitor_init_globals_core();
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init_qmp_commands();
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if (!trace_init_backends()) {
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return EXIT_FAILURE;
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}
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qemu_set_log(LOG_TRACE);
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qemu_init_main_loop(&error_fatal);
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process_options(argc, argv);
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/*
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* Write the pid file after creating chardevs, exports, and NBD servers but
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* before accepting connections. This ordering is documented. Do not change
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* it.
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*/
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pid_file_init();
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while (!exit_requested) {
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main_loop_wait(false);
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}
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blk_exp_close_all();
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bdrv_drain_all_begin();
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job_cancel_sync_all();
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bdrv_close_all();
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monitor_cleanup();
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qemu_chr_cleanup();
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user_creatable_cleanup();
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return EXIT_SUCCESS;
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}
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