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/*
* Copyright (C) 2016 FUJITSU LIMITED
* Author: Wen Congyang <wency@cn.fujitsu.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; version 2.1 only. with the special
* exception on linking described in file LICENSE.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*/
#include "libxl_osdeps.h" /* must come before any other headers */
#include "libxl_internal.h"
/* ========== init() and cleanup() ========== */
int init_subkind_qdisk(libxl__checkpoint_devices_state *cds)
{
/*
* We don't know if we use qemu block replication, so
* we cannot start block replication here.
*/
return 0;
}
void cleanup_subkind_qdisk(libxl__checkpoint_devices_state *cds)
{
}
/* ========== setup() and teardown() ========== */
static void colo_qdisk_setup(libxl__egc *egc, libxl__checkpoint_device *dev,
bool primary)
{
const libxl_device_disk *disk = dev->backend_dev;
int ret, rc = 0;
libxl__colo_qdisk *colo_qdisk = NULL;
char port[32];
/* Convenience aliases */
libxl__checkpoint_devices_state *const cds = dev->cds;
const char *host = disk->colo_host;
const char *export_name = disk->colo_export;
const int domid = cds->domid;
STATE_AO_GC(dev->cds->ao);
if (disk->backend != LIBXL_DISK_BACKEND_QDISK ||
!libxl_defbool_val(disk->colo_enable) ||
!host || !export_name || (disk->colo_port <= 0) ||
!disk->active_disk || !disk->hidden_disk) {
rc = ERROR_CHECKPOINT_DEVOPS_DOES_NOT_MATCH;
goto out;
}
dev->matched = true;
GCNEW(colo_qdisk);
dev->concrete_data = colo_qdisk;
if (primary) {
libxl__colo_save_state *css = cds->concrete_data;
css->qdisk_used = true;
/* NBD server is not ready, so we cannot start block replication now */
goto out;
} else {
libxl__colo_restore_state *crs = cds->concrete_data;
sprintf(port, "%d", disk->colo_port);
if (!crs->qdisk_used) {
/* start nbd server */
ret = libxl__qmp_nbd_server_start(gc, domid, host, port);
if (ret) {
rc = ERROR_FAIL;
goto out;
}
crs->host = host;
crs->port = port;
} else {
if (strcmp(crs->host, host) || strcmp(crs->port, port)) {
LOGD(ERROR, domid, "The host and port of all disks must be the same");
rc = ERROR_FAIL;
goto out;
}
}
crs->qdisk_used = true;
ret = libxl__qmp_nbd_server_add(gc, domid, export_name);
if (ret)
rc = ERROR_FAIL;
colo_qdisk->setuped = true;
}
out:
dev->aodev.rc = rc;
dev->aodev.callback(egc, &dev->aodev);
}
static void colo_qdisk_teardown(libxl__egc *egc, libxl__checkpoint_device *dev,
bool primary)
{
int ret, rc = 0;
const libxl__colo_qdisk *colo_qdisk = dev->concrete_data;
const libxl_device_disk *disk = dev->backend_dev;
/* Convenience aliases */
libxl__checkpoint_devices_state *const cds = dev->cds;
const int domid = cds->domid;
const char *export_name = disk->colo_export;
EGC_GC;
if (primary) {
if (!colo_qdisk->setuped)
goto out;
/*
* There is no way to get the child name, but we know it is children.1
*/
ret = libxl__qmp_x_blockdev_change(gc, domid, export_name,
"children.1", NULL);
if (ret)
rc = ERROR_FAIL;
} else {
libxl__colo_restore_state *crs = cds->concrete_data;
if (crs->qdisk_used) {
ret = libxl__qmp_nbd_server_stop(gc, domid);
if (ret)
rc = ERROR_FAIL;
}
}
out:
dev->aodev.rc = rc;
dev->aodev.callback(egc, &dev->aodev);
}
/* ========== checkpointing APIs ========== */
static void colo_qdisk_save_preresume(libxl__egc *egc,
libxl__checkpoint_device *dev)
{
libxl__colo_qdisk *colo_qdisk = dev->concrete_data;
const libxl_device_disk *disk = dev->backend_dev;
int ret, rc = 0;
char *node = NULL;
char *cmd = NULL;
/* Convenience aliases */
const int domid = dev->cds->domid;
const char *host = disk->colo_host;
int port = disk->colo_port;
const char *export_name = disk->colo_export;
EGC_GC;
if (colo_qdisk->setuped)
goto out;
/* qmp command doesn't support the driver "nbd" */
node = GCSPRINTF("colo_node%d",
libxl__device_disk_dev_number(disk->vdev, NULL, NULL));
cmd = GCSPRINTF("drive_add -n buddy driver=replication,mode=primary,"
"file.driver=nbd,file.host=%s,file.port=%d,"
"file.export=%s,node-name=%s",
host, port, export_name, node);
ret = libxl__qmp_hmp(gc, domid, cmd, NULL);
if (ret)
rc = ERROR_FAIL;
ret = libxl__qmp_x_blockdev_change(gc, domid, export_name, NULL, node);
if (ret)
rc = ERROR_FAIL;
colo_qdisk->setuped = true;
out:
dev->aodev.rc = rc;
dev->aodev.callback(egc, &dev->aodev);
}
/* ======== primary ======== */
static void colo_qdisk_save_setup(libxl__egc *egc,
libxl__checkpoint_device *dev)
{
colo_qdisk_setup(egc, dev, true);
}
static void colo_qdisk_save_teardown(libxl__egc *egc,
libxl__checkpoint_device *dev)
{
colo_qdisk_teardown(egc, dev, true);
}
const libxl__checkpoint_device_instance_ops colo_save_device_qdisk = {
.kind = LIBXL__DEVICE_KIND_VBD,
.setup = colo_qdisk_save_setup,
.teardown = colo_qdisk_save_teardown,
.preresume = colo_qdisk_save_preresume,
};
/* ======== secondary ======== */
static void colo_qdisk_restore_setup(libxl__egc *egc,
libxl__checkpoint_device *dev)
{
colo_qdisk_setup(egc, dev, false);
}
static void colo_qdisk_restore_teardown(libxl__egc *egc,
libxl__checkpoint_device *dev)
{
colo_qdisk_teardown(egc, dev, false);
}
const libxl__checkpoint_device_instance_ops colo_restore_device_qdisk = {
.kind = LIBXL__DEVICE_KIND_VBD,
.setup = colo_qdisk_restore_setup,
.teardown = colo_qdisk_restore_teardown,
};
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