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/*
* Copyright (C) 2014 FUJITSU LIMITED
* Author Lai Jiangshan <laijs@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"
/*** drbd implementation ***/
const int DRBD_SEND_CHECKPOINT = 20;
const int DRBD_WAIT_CHECKPOINT_ACK = 30;
typedef struct libxl__remus_drbd_disk {
int ctl_fd;
int ackwait;
} libxl__remus_drbd_disk;
int init_subkind_drbd_disk(libxl__checkpoint_devices_state *cds)
{
libxl__remus_state *rs = cds->concrete_data;
STATE_AO_GC(cds->ao);
rs->drbd_probe_script = GCSPRINTF("%s/block-drbd-probe",
libxl__xen_script_dir_path());
return 0;
}
void cleanup_subkind_drbd_disk(libxl__checkpoint_devices_state *cds)
{
return;
}
/*----- match(), setup() and teardown() -----*/
/* callbacks */
static void match_async_exec_cb(libxl__egc *egc,
libxl__async_exec_state *aes,
int rc, int status);
/* implementations */
static void match_async_exec(libxl__egc *egc, libxl__checkpoint_device *dev);
static void drbd_setup(libxl__egc *egc, libxl__checkpoint_device *dev)
{
STATE_AO_GC(dev->cds->ao);
match_async_exec(egc, dev);
}
static void match_async_exec(libxl__egc *egc, libxl__checkpoint_device *dev)
{
int arraysize, nr = 0, rc;
const libxl_device_disk *disk = dev->backend_dev;
libxl__async_exec_state *aes = &dev->aodev.aes;
libxl__remus_state *rs = dev->cds->concrete_data;
STATE_AO_GC(dev->cds->ao);
/* setup env & args */
arraysize = 1;
GCNEW_ARRAY(aes->env, arraysize);
aes->env[nr++] = NULL;
assert(nr <= arraysize);
arraysize = 3;
nr = 0;
GCNEW_ARRAY(aes->args, arraysize);
aes->args[nr++] = rs->drbd_probe_script;
aes->args[nr++] = disk->pdev_path;
aes->args[nr++] = NULL;
assert(nr <= arraysize);
aes->ao = dev->cds->ao;
aes->what = GCSPRINTF("%s %s", aes->args[0], aes->args[1]);
aes->timeout_ms = LIBXL_HOTPLUG_TIMEOUT * 1000;
aes->callback = match_async_exec_cb;
aes->stdfds[0] = -1;
aes->stdfds[1] = -1;
aes->stdfds[2] = -1;
rc = libxl__async_exec_start(aes);
if (rc)
goto out;
return;
out:
dev->aodev.rc = rc;
dev->aodev.callback(egc, &dev->aodev);
}
static void match_async_exec_cb(libxl__egc *egc,
libxl__async_exec_state *aes,
int rc, int status)
{
libxl__ao_device *aodev = CONTAINER_OF(aes, *aodev, aes);
libxl__checkpoint_device *dev = CONTAINER_OF(aodev, *dev, aodev);
libxl__remus_drbd_disk *drbd_disk;
const libxl_device_disk *disk = dev->backend_dev;
STATE_AO_GC(aodev->ao);
if (rc)
goto out;
if (status) {
rc = ERROR_CHECKPOINT_DEVOPS_DOES_NOT_MATCH;
/* BUG: seems to assume that any exit status means `no match' */
/* BUG: exit status will have been logged as an error */
goto out;
}
/* ops matched */
dev->matched = true;
GCNEW(drbd_disk);
dev->concrete_data = drbd_disk;
drbd_disk->ackwait = 0;
drbd_disk->ctl_fd = open(disk->pdev_path, O_RDONLY);
if (drbd_disk->ctl_fd < 0) {
rc = ERROR_FAIL;
goto out;
}
rc = 0;
out:
aodev->rc = rc;
aodev->callback(egc, aodev);
}
static void drbd_teardown(libxl__egc *egc, libxl__checkpoint_device *dev)
{
libxl__remus_drbd_disk *drbd_disk = dev->concrete_data;
STATE_AO_GC(dev->cds->ao);
close(drbd_disk->ctl_fd);
dev->aodev.rc = 0;
dev->aodev.callback(egc, &dev->aodev);
}
/*----- checkpointing APIs -----*/
/* callbacks */
static void checkpoint_async_call_done(libxl__egc *egc,
libxl__ev_child *child,
pid_t pid, int status);
/* API implementations */
/* this op will not wait and block, so implement as sync op */
static void drbd_postsuspend(libxl__egc *egc, libxl__checkpoint_device *dev)
{
STATE_AO_GC(dev->cds->ao);
libxl__remus_drbd_disk *rdd = dev->concrete_data;
if (!rdd->ackwait) {
if (ioctl(rdd->ctl_fd, DRBD_SEND_CHECKPOINT, 0) <= 0)
rdd->ackwait = 1;
}
dev->aodev.rc = 0;
dev->aodev.callback(egc, &dev->aodev);
}
static void drbd_preresume_async(libxl__checkpoint_device *dev);
static void drbd_preresume(libxl__egc *egc, libxl__checkpoint_device *dev)
{
ASYNC_CALL(egc, dev->cds->ao, &dev->aodev.child, dev,
drbd_preresume_async,
checkpoint_async_call_done);
}
static void drbd_preresume_async(libxl__checkpoint_device *dev)
{
libxl__remus_drbd_disk *rdd = dev->concrete_data;
int ackwait = rdd->ackwait;
if (ackwait) {
ioctl(rdd->ctl_fd, DRBD_WAIT_CHECKPOINT_ACK, 0);
ackwait = 0;
}
_exit(ackwait);
}
static void checkpoint_async_call_done(libxl__egc *egc,
libxl__ev_child *child,
pid_t pid, int status)
{
int rc;
libxl__ao_device *aodev = CONTAINER_OF(child, *aodev, child);
libxl__checkpoint_device *dev = CONTAINER_OF(aodev, *dev, aodev);
libxl__remus_drbd_disk *rdd = dev->concrete_data;
STATE_AO_GC(aodev->ao);
if (!WIFEXITED(status)) {
rc = ERROR_FAIL;
goto out;
}
rdd->ackwait = WEXITSTATUS(status);
rc = 0;
out:
aodev->rc = rc;
aodev->callback(egc, aodev);
}
const libxl__checkpoint_device_instance_ops remus_device_drbd_disk = {
.kind = LIBXL__DEVICE_KIND_VBD,
.setup = drbd_setup,
.teardown = drbd_teardown,
.postsuspend = drbd_postsuspend,
.preresume = drbd_preresume,
};
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