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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "tools/rbd_mirror/image_replayer/PrepareRemoteImageRequest.h"
#include "include/rados/librados.hpp"
#include "cls/rbd/cls_rbd_client.h"
#include "common/debug.h"
#include "common/errno.h"
#include "common/WorkQueue.h"
#include "journal/Journaler.h"
#include "librbd/ImageCtx.h"
#include "librbd/Utils.h"
#include "librbd/journal/Types.h"
#include "tools/rbd_mirror/Threads.h"
#include "tools/rbd_mirror/image_replayer/GetMirrorImageIdRequest.h"
#include "tools/rbd_mirror/image_replayer/Utils.h"
#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_rbd_mirror
#undef dout_prefix
#define dout_prefix *_dout << "rbd::mirror::image_replayer::" \
<< "PrepareRemoteImageRequest: " << this << " " \
<< __func__ << ": "
namespace rbd {
namespace mirror {
namespace image_replayer {
using librbd::util::create_async_context_callback;
using librbd::util::create_context_callback;
using librbd::util::create_rados_callback;
template <typename I>
void PrepareRemoteImageRequest<I>::send() {
get_remote_mirror_uuid();
}
template <typename I>
void PrepareRemoteImageRequest<I>::get_remote_mirror_uuid() {
dout(20) << dendl;
librados::ObjectReadOperation op;
librbd::cls_client::mirror_uuid_get_start(&op);
librados::AioCompletion *aio_comp = create_rados_callback<
PrepareRemoteImageRequest<I>,
&PrepareRemoteImageRequest<I>::handle_get_remote_mirror_uuid>(this);
int r = m_remote_io_ctx.aio_operate(RBD_MIRRORING, aio_comp, &op, &m_out_bl);
ceph_assert(r == 0);
aio_comp->release();
}
template <typename I>
void PrepareRemoteImageRequest<I>::handle_get_remote_mirror_uuid(int r) {
if (r >= 0) {
auto it = m_out_bl.cbegin();
r = librbd::cls_client::mirror_uuid_get_finish(&it, m_remote_mirror_uuid);
if (r >= 0 && m_remote_mirror_uuid->empty()) {
r = -ENOENT;
}
}
dout(20) << "r=" << r << dendl;
if (r < 0) {
if (r == -ENOENT) {
dout(5) << "remote mirror uuid missing" << dendl;
} else {
derr << "failed to retrieve remote mirror uuid: " << cpp_strerror(r)
<< dendl;
}
finish(r);
return;
}
get_remote_image_id();
}
template <typename I>
void PrepareRemoteImageRequest<I>::get_remote_image_id() {
dout(20) << dendl;
Context *ctx = create_context_callback<
PrepareRemoteImageRequest<I>,
&PrepareRemoteImageRequest<I>::handle_get_remote_image_id>(this);
auto req = GetMirrorImageIdRequest<I>::create(m_remote_io_ctx,
m_global_image_id,
m_remote_image_id, ctx);
req->send();
}
template <typename I>
void PrepareRemoteImageRequest<I>::handle_get_remote_image_id(int r) {
dout(20) << "r=" << r << ", "
<< "remote_image_id=" << *m_remote_image_id << dendl;
if (r < 0) {
finish(r);
return;
}
get_client();
}
template <typename I>
void PrepareRemoteImageRequest<I>::get_client() {
dout(20) << dendl;
ceph_assert(*m_remote_journaler == nullptr);
*m_remote_journaler = new Journaler(m_threads->work_queue, m_threads->timer,
&m_threads->timer_lock, m_remote_io_ctx,
*m_remote_image_id, m_local_mirror_uuid,
m_journal_settings);
Context *ctx = create_async_context_callback(
m_threads->work_queue, create_context_callback<
PrepareRemoteImageRequest<I>,
&PrepareRemoteImageRequest<I>::handle_get_client>(this));
(*m_remote_journaler)->get_client(m_local_mirror_uuid, &m_client, ctx);
}
template <typename I>
void PrepareRemoteImageRequest<I>::handle_get_client(int r) {
dout(20) << "r=" << r << dendl;
if (r == -ENOENT) {
dout(10) << "client not registered" << dendl;
register_client();
} else if (r < 0) {
derr << "failed to retrieve client: " << cpp_strerror(r) << dendl;
finish(r);
} else if (!util::decode_client_meta(m_client, m_client_meta)) {
// require operator intervention since the data is corrupt
finish(-EBADMSG);
} else {
// skip registration if it already exists
*m_client_state = m_client.state;
finish(0);
}
}
template <typename I>
void PrepareRemoteImageRequest<I>::register_client() {
dout(20) << dendl;
librbd::journal::MirrorPeerClientMeta mirror_peer_client_meta{
m_local_image_id};
mirror_peer_client_meta.state = librbd::journal::MIRROR_PEER_STATE_REPLAYING;
librbd::journal::ClientData client_data{mirror_peer_client_meta};
bufferlist client_data_bl;
encode(client_data, client_data_bl);
Context *ctx = create_async_context_callback(
m_threads->work_queue, create_context_callback<
PrepareRemoteImageRequest<I>,
&PrepareRemoteImageRequest<I>::handle_register_client>(this));
(*m_remote_journaler)->register_client(client_data_bl, ctx);
}
template <typename I>
void PrepareRemoteImageRequest<I>::handle_register_client(int r) {
dout(20) << "r=" << r << dendl;
if (r < 0) {
derr << "failed to register with remote journal: " << cpp_strerror(r)
<< dendl;
finish(r);
return;
}
*m_client_state = cls::journal::CLIENT_STATE_CONNECTED;
*m_client_meta = librbd::journal::MirrorPeerClientMeta(m_local_image_id);
m_client_meta->state = librbd::journal::MIRROR_PEER_STATE_REPLAYING;
finish(0);
}
template <typename I>
void PrepareRemoteImageRequest<I>::finish(int r) {
dout(20) << "r=" << r << dendl;
if (r < 0) {
delete *m_remote_journaler;
*m_remote_journaler = nullptr;
}
m_on_finish->complete(r);
delete this;
}
} // namespace image_replayer
} // namespace mirror
} // namespace rbd
template class rbd::mirror::image_replayer::PrepareRemoteImageRequest<librbd::ImageCtx>;
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