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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "librbd/migration/OpenSourceImageRequest.h"
#include "common/dout.h"
#include "common/errno.h"
#include "librbd/ImageCtx.h"
#include "librbd/ImageState.h"
#include "librbd/Utils.h"
#include "librbd/io/ImageDispatcher.h"
#include "librbd/migration/ImageDispatch.h"
#include "librbd/migration/NativeFormat.h"
#include "librbd/migration/SourceSpecBuilder.h"
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::migration::OpenSourceImageRequest: " \
<< this << " " << __func__ << ": "
namespace librbd {
namespace migration {
template <typename I>
OpenSourceImageRequest<I>::OpenSourceImageRequest(
librados::IoCtx& io_ctx, I* dst_image_ctx, uint64_t src_snap_id,
const MigrationInfo &migration_info, I** src_image_ctx, Context* on_finish)
: m_cct(reinterpret_cast<CephContext*>(io_ctx.cct())), m_io_ctx(io_ctx),
m_dst_image_ctx(dst_image_ctx), m_src_snap_id(src_snap_id),
m_migration_info(migration_info), m_src_image_ctx(src_image_ctx),
m_on_finish(on_finish) {
ldout(m_cct, 10) << dendl;
}
template <typename I>
void OpenSourceImageRequest<I>::send() {
open_source();
}
template <typename I>
void OpenSourceImageRequest<I>::open_source() {
ldout(m_cct, 10) << dendl;
// note that all source image ctx properties are placeholders
*m_src_image_ctx = I::create("", "", CEPH_NOSNAP, m_io_ctx, true);
auto src_image_ctx = *m_src_image_ctx;
src_image_ctx->child = m_dst_image_ctx;
// use default layout values (can be overridden by source layers later)
src_image_ctx->order = 22;
src_image_ctx->layout = file_layout_t();
src_image_ctx->layout.stripe_count = 1;
src_image_ctx->layout.stripe_unit = 1ULL << src_image_ctx->order;
src_image_ctx->layout.object_size = 1Ull << src_image_ctx->order;
src_image_ctx->layout.pool_id = -1;
bool import_only = true;
auto source_spec = m_migration_info.source_spec;
if (source_spec.empty()) {
// implies legacy migration from RBD image in same cluster
source_spec = NativeFormat<I>::build_source_spec(
m_migration_info.pool_id, m_migration_info.pool_namespace,
m_migration_info.image_name, m_migration_info.image_id);
import_only = false;
}
ldout(m_cct, 15) << "source_spec=" << source_spec << ", "
<< "source_snap_id=" << m_src_snap_id << ", "
<< "import_only=" << import_only << dendl;
SourceSpecBuilder<I> source_spec_builder{src_image_ctx};
json_spirit::mObject source_spec_object;
int r = source_spec_builder.parse_source_spec(source_spec,
&source_spec_object);
if (r < 0) {
lderr(m_cct) << "failed to parse migration source-spec:" << cpp_strerror(r)
<< dendl;
(*m_src_image_ctx)->state->close();
finish(r);
return;
}
r = source_spec_builder.build_format(source_spec_object, import_only,
&m_format);
if (r < 0) {
lderr(m_cct) << "failed to build migration format handler: "
<< cpp_strerror(r) << dendl;
(*m_src_image_ctx)->state->close();
finish(r);
return;
}
auto ctx = util::create_context_callback<
OpenSourceImageRequest<I>,
&OpenSourceImageRequest<I>::handle_open_source>(this);
m_format->open(ctx);
}
template <typename I>
void OpenSourceImageRequest<I>::handle_open_source(int r) {
ldout(m_cct, 10) << "r=" << r << dendl;
if (r < 0) {
lderr(m_cct) << "failed to open migration source: " << cpp_strerror(r)
<< dendl;
finish(r);
return;
}
get_image_size();
}
template <typename I>
void OpenSourceImageRequest<I>::get_image_size() {
ldout(m_cct, 10) << dendl;
auto ctx = util::create_context_callback<
OpenSourceImageRequest<I>,
&OpenSourceImageRequest<I>::handle_get_image_size>(this);
m_format->get_image_size(CEPH_NOSNAP, &m_image_size, ctx);
}
template <typename I>
void OpenSourceImageRequest<I>::handle_get_image_size(int r) {
ldout(m_cct, 10) << "r=" << r << ", "
<< "image_size=" << m_image_size << dendl;
if (r < 0) {
lderr(m_cct) << "failed to retrieve image size: " << cpp_strerror(r)
<< dendl;
close_image(r);
return;
}
auto src_image_ctx = *m_src_image_ctx;
src_image_ctx->image_lock.lock();
src_image_ctx->size = m_image_size;
src_image_ctx->image_lock.unlock();
get_snapshots();
}
template <typename I>
void OpenSourceImageRequest<I>::get_snapshots() {
ldout(m_cct, 10) << dendl;
auto ctx = util::create_context_callback<
OpenSourceImageRequest<I>,
&OpenSourceImageRequest<I>::handle_get_snapshots>(this);
m_format->get_snapshots(&m_snap_infos, ctx);
}
template <typename I>
void OpenSourceImageRequest<I>::handle_get_snapshots(int r) {
ldout(m_cct, 10) << "r=" << r << dendl;
if (r < 0) {
lderr(m_cct) << "failed to retrieve snapshots: " << cpp_strerror(r)
<< dendl;
close_image(r);
return;
}
// copy snapshot metadata to image ctx
auto src_image_ctx = *m_src_image_ctx;
src_image_ctx->image_lock.lock();
src_image_ctx->snaps.clear();
src_image_ctx->snap_info.clear();
src_image_ctx->snap_ids.clear();
::SnapContext snapc;
for (auto it = m_snap_infos.rbegin(); it != m_snap_infos.rend(); ++it) {
auto& [snap_id, snap_info] = *it;
snapc.snaps.push_back(snap_id);
ldout(m_cct, 10) << "adding snap: ns=" << snap_info.snap_namespace << ", "
<< "name=" << snap_info.name << ", "
<< "id=" << snap_id << dendl;
src_image_ctx->add_snap(
snap_info.snap_namespace, snap_info.name, snap_id,
snap_info.size, snap_info.parent, snap_info.protection_status,
snap_info.flags, snap_info.timestamp);
}
if (!snapc.snaps.empty()) {
snapc.seq = snapc.snaps[0];
}
src_image_ctx->snapc = snapc;
ldout(m_cct, 15) << "read snap id: " << m_src_snap_id << ", "
<< "write snapc={"
<< "seq=" << snapc.seq << ", "
<< "snaps=" << snapc.snaps << "}" << dendl;
// ensure data_ctx and data_io_context are pointing to correct snapshot
if (m_src_snap_id != CEPH_NOSNAP) {
int r = src_image_ctx->snap_set(m_src_snap_id);
if (r < 0) {
src_image_ctx->image_lock.unlock();
lderr(m_cct) << "error setting source image snap id: "
<< cpp_strerror(r) << dendl;
finish(r);
return;
}
}
src_image_ctx->image_lock.unlock();
finish(0);
}
template <typename I>
void OpenSourceImageRequest<I>::close_image(int r) {
ldout(m_cct, 10) << "r=" << r << dendl;
auto ctx = new LambdaContext([this, r](int) {
finish(r);
});
(*m_src_image_ctx)->state->close(ctx);
}
template <typename I>
void OpenSourceImageRequest<I>::register_image_dispatch() {
ldout(m_cct, 10) << dendl;
// intercept any IO requests to the source image
auto io_image_dispatch = ImageDispatch<I>::create(
*m_src_image_ctx, std::move(m_format));
(*m_src_image_ctx)->io_image_dispatcher->register_dispatch(io_image_dispatch);
}
template <typename I>
void OpenSourceImageRequest<I>::finish(int r) {
ldout(m_cct, 10) << "r=" << r << dendl;
if (r < 0) {
*m_src_image_ctx = nullptr;
} else {
register_image_dispatch();
}
m_on_finish->complete(r);
delete this;
}
} // namespace migration
} // namespace librbd
template class librbd::migration::OpenSourceImageRequest<librbd::ImageCtx>;
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