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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/RawSnapshot.h"
#include "common/dout.h"
#include "common/errno.h"
#include "librbd/ImageCtx.h"
#include "librbd/Utils.h"
#include "librbd/io/AioCompletion.h"
#include "librbd/io/ReadResult.h"
#include "librbd/migration/SourceSpecBuilder.h"
#include "librbd/migration/StreamInterface.h"
namespace librbd {
namespace migration {
namespace {
const std::string NAME_KEY{"name"};
} // anonymous namespace
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::migration::RawSnapshot::OpenRequest " \
<< this << " " << __func__ << ": "
template <typename I>
struct RawSnapshot<I>::OpenRequest {
RawSnapshot* raw_snapshot;
Context* on_finish;
OpenRequest(RawSnapshot* raw_snapshot, Context* on_finish)
: raw_snapshot(raw_snapshot), on_finish(on_finish) {
}
void send() {
open_stream();
}
void open_stream() {
auto cct = raw_snapshot->m_image_ctx->cct;
ldout(cct, 10) << dendl;
auto ctx = util::create_context_callback<
OpenRequest, &OpenRequest::handle_open_stream>(this);
raw_snapshot->m_stream->open(ctx);
}
void handle_open_stream(int r) {
auto cct = raw_snapshot->m_image_ctx->cct;
ldout(cct, 10) << "r=" << r << dendl;
if (r < 0) {
lderr(cct) << "failed to open stream: " << cpp_strerror(r) << dendl;
finish(r);
return;
}
get_image_size();
}
void get_image_size() {
auto cct = raw_snapshot->m_image_ctx->cct;
ldout(cct, 10) << dendl;
auto ctx = util::create_context_callback<
OpenRequest, &OpenRequest::handle_get_image_size>(this);
raw_snapshot->m_stream->get_size(&raw_snapshot->m_snap_info.size, ctx);
}
void handle_get_image_size(int r) {
auto cct = raw_snapshot->m_image_ctx->cct;
ldout(cct, 10) << "r=" << r << ", "
<< "image_size=" << raw_snapshot->m_snap_info.size << dendl;
if (r < 0) {
lderr(cct) << "failed to open stream: " << cpp_strerror(r) << dendl;
close_stream(r);
return;
}
finish(0);
}
void close_stream(int r) {
auto cct = raw_snapshot->m_image_ctx->cct;
ldout(cct, 10) << dendl;
auto ctx = new LambdaContext([this, r](int) {
handle_close_stream(r);
});
raw_snapshot->m_stream->close(ctx);
}
void handle_close_stream(int r) {
auto cct = raw_snapshot->m_image_ctx->cct;
ldout(cct, 10) << "r=" << r << dendl;
raw_snapshot->m_stream.reset();
finish(r);
}
void finish(int r) {
auto cct = raw_snapshot->m_image_ctx->cct;
ldout(cct, 10) << "r=" << r << dendl;
on_finish->complete(r);
delete this;
}
};
#undef dout_prefix
#define dout_prefix *_dout << "librbd::migration::RawSnapshot: " << this \
<< " " << __func__ << ": "
template <typename I>
RawSnapshot<I>::RawSnapshot(I* image_ctx,
const json_spirit::mObject& json_object,
const SourceSpecBuilder<I>* source_spec_builder,
uint64_t index)
: m_image_ctx(image_ctx), m_json_object(json_object),
m_source_spec_builder(source_spec_builder), m_index(index),
m_snap_info({}, {}, 0, {}, 0, 0, {}) {
auto cct = m_image_ctx->cct;
ldout(cct, 10) << dendl;
}
template <typename I>
void RawSnapshot<I>::open(SnapshotInterface* previous_snapshot,
Context* on_finish) {
auto cct = m_image_ctx->cct;
// special-case for treating the HEAD revision as a snapshot
if (m_index != CEPH_NOSNAP) {
auto& name_val = m_json_object[NAME_KEY];
if (name_val.type() == json_spirit::str_type) {
m_snap_info.name = name_val.get_str();
} else if (name_val.type() == json_spirit::null_type) {
uuid_d uuid_gen;
uuid_gen.generate_random();
m_snap_info.name = uuid_gen.to_string();
} else {
lderr(cct) << "invalid snapshot name" << dendl;
on_finish->complete(-EINVAL);
return;
}
}
ldout(cct, 10) << "name=" << m_snap_info.name << dendl;
int r = m_source_spec_builder->build_stream(m_json_object, &m_stream);
if (r < 0) {
lderr(cct) << "failed to build migration stream handler" << cpp_strerror(r)
<< dendl;
on_finish->complete(r);
return;
}
auto req = new OpenRequest(this, on_finish);
req->send();
}
template <typename I>
void RawSnapshot<I>::close(Context* on_finish) {
auto cct = m_image_ctx->cct;
ldout(cct, 10) << dendl;
if (!m_stream) {
on_finish->complete(0);
return;
}
m_stream->close(on_finish);
}
template <typename I>
void RawSnapshot<I>::read(io::AioCompletion* aio_comp,
io::Extents&& image_extents,
io::ReadResult&& read_result, int op_flags,
int read_flags,
const ZTracer::Trace &parent_trace) {
auto cct = m_image_ctx->cct;
ldout(cct, 20) << "image_extents=" << image_extents << dendl;
aio_comp->read_result = std::move(read_result);
aio_comp->read_result.set_image_extents(image_extents);
aio_comp->set_request_count(1);
auto ctx = new io::ReadResult::C_ImageReadRequest(aio_comp,
0, image_extents);
// raw directly maps the image-extent IO down to a byte IO extent
m_stream->read(std::move(image_extents), &ctx->bl, ctx);
}
template <typename I>
void RawSnapshot<I>::list_snap(io::Extents&& image_extents,
int list_snaps_flags,
io::SparseExtents* sparse_extents,
const ZTracer::Trace &parent_trace,
Context* on_finish) {
auto cct = m_image_ctx->cct;
ldout(cct, 20) << "image_extents=" << image_extents << dendl;
// raw does support sparse extents so list the full IO extent as a delta
for (auto& [image_offset, image_length] : image_extents) {
sparse_extents->insert(image_offset, image_length,
{io::SPARSE_EXTENT_STATE_DATA, image_length});
}
on_finish->complete(0);
}
} // namespace migration
} // namespace librbd
template class librbd::migration::RawSnapshot<librbd::ImageCtx>;
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