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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "FlattenRequest.h"
#include "common/dout.h"
#include "common/errno.h"
#include "librbd/Utils.h"
#include "librbd/crypto/EncryptionFormat.h"
#include "librbd/crypto/Utils.h"
#include "librbd/crypto/luks/LoadRequest.h"
#include "librbd/crypto/luks/Magic.h"
#include "librbd/io/AioCompletion.h"
#include "librbd/io/ImageDispatchSpec.h"
#include "librbd/io/ReadResult.h"
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::crypto::luks::FlattenRequest: " \
<< this << " " << __func__ << ": "
namespace librbd {
namespace crypto {
namespace luks {
using librbd::util::create_context_callback;
template <typename I>
FlattenRequest<I>::FlattenRequest(
I* image_ctx, Context* on_finish) : m_image_ctx(image_ctx),
m_on_finish(on_finish) {
ceph_assert(m_image_ctx->encryption_format.get() != nullptr);
}
template <typename I>
void FlattenRequest<I>::send() {
read_header();
}
template <typename I>
void FlattenRequest<I>::read_header() {
auto ctx = create_context_callback<
FlattenRequest<I>, &FlattenRequest<I>::handle_read_header>(this);
auto aio_comp = io::AioCompletion::create_and_start(
ctx, librbd::util::get_image_ctx(m_image_ctx), io::AIO_TYPE_READ);
auto crypto = m_image_ctx->encryption_format->get_crypto();
ZTracer::Trace trace;
auto req = io::ImageDispatchSpec::create_read(
*m_image_ctx, io::IMAGE_DISPATCH_LAYER_API_START, aio_comp,
{{0, crypto->get_data_offset()}}, io::ImageArea::CRYPTO_HEADER,
io::ReadResult{&m_bl}, m_image_ctx->get_data_io_context(), 0, 0,
trace);
req->send();
}
template <typename I>
void FlattenRequest<I>::handle_read_header(int r) {
ldout(m_image_ctx->cct, 20) << "r=" << r << dendl;
if (r < 0) {
lderr(m_image_ctx->cct) << "error reading from image: " << cpp_strerror(r)
<< dendl;
finish(r);
return;
}
r = Magic::is_rbd_clone(m_bl);
if (r < 0) {
lderr(m_image_ctx->cct) << "unable to determine encryption header magic: "
<< cpp_strerror(r) << dendl;
finish(r);
return;
} else if (r > 0) {
// switch magic
r = Magic::replace_magic(m_image_ctx->cct, m_bl);
if (r < 0) {
lderr(m_image_ctx->cct) << "unable to restore header magic: "
<< cpp_strerror(r) << dendl;
finish(r);
return;
}
}
write_header();
}
template <typename I>
void FlattenRequest<I>::write_header() {
// write header to offset 0 of the image
auto ctx = create_context_callback<
FlattenRequest<I>, &FlattenRequest<I>::handle_write_header>(this);
auto aio_comp = io::AioCompletion::create_and_start(
ctx, librbd::util::get_image_ctx(m_image_ctx), io::AIO_TYPE_WRITE);
ZTracer::Trace trace;
auto req = io::ImageDispatchSpec::create_write(
*m_image_ctx, io::IMAGE_DISPATCH_LAYER_API_START, aio_comp,
{{0, m_bl.length()}}, io::ImageArea::CRYPTO_HEADER,
std::move(m_bl), 0, trace);
req->send();
}
template <typename I>
void FlattenRequest<I>::handle_write_header(int r) {
ldout(m_image_ctx->cct, 20) << "r=" << r << dendl;
if (r < 0) {
lderr(m_image_ctx->cct) << "error writing header to image: "
<< cpp_strerror(r) << dendl;
finish(r);
return;
}
flush();
}
template <typename I>
void FlattenRequest<I>::flush() {
auto ctx = create_context_callback<
FlattenRequest<I>, &FlattenRequest<I>::handle_flush>(this);
auto aio_comp = io::AioCompletion::create_and_start(
ctx, librbd::util::get_image_ctx(m_image_ctx), io::AIO_TYPE_FLUSH);
auto req = io::ImageDispatchSpec::create_flush(
*m_image_ctx, io::IMAGE_DISPATCH_LAYER_INTERNAL_START, aio_comp,
io::FLUSH_SOURCE_INTERNAL, {});
req->send();
}
template <typename I>
void FlattenRequest<I>::handle_flush(int r) {
ldout(m_image_ctx->cct, 20) << "r=" << r << dendl;
if (r < 0) {
lderr(m_image_ctx->cct) << "unable to flush image: " << cpp_strerror(r)
<< dendl;
}
finish(r);
}
template <typename I>
void FlattenRequest<I>::finish(int r) {
ldout(m_image_ctx->cct, 20) << "r=" << r << dendl;
m_on_finish->complete(r);
delete this;
}
} // namespace luks
} // namespace crypto
} // namespace librbd
template class librbd::crypto::luks::FlattenRequest<librbd::ImageCtx>;
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