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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "LoadRequest.h"
#include "common/dout.h"
#include "common/errno.h"
#include "librbd/Utils.h"
#include "librbd/ImageCtx.h"
#include "librbd/crypto/EncryptionFormat.h"
#include "librbd/crypto/Types.h"
#include "librbd/crypto/Utils.h"
#include "librbd/io/AioCompletion.h"
#include "librbd/io/ImageDispatcherInterface.h"
#include "librbd/io/ImageDispatchSpec.h"
#include "librbd/io/Types.h"
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::crypto::LoadRequest: " << this \
<< " " << __func__ << ": "
namespace librbd {
namespace crypto {
using librbd::util::create_context_callback;
template <typename I>
LoadRequest<I>::LoadRequest(
I* image_ctx, std::vector<EncryptionFormat>&& formats,
Context* on_finish) : m_image_ctx(image_ctx),
m_on_finish(on_finish),
m_format_idx(0),
m_is_current_format_cloned(false),
m_formats(std::move(formats)) {
}
template <typename I>
void LoadRequest<I>::send() {
if (m_formats.empty()) {
lderr(m_image_ctx->cct) << "no encryption formats were specified" << dendl;
finish(-EINVAL);
return;
}
ldout(m_image_ctx->cct, 20) << "got " << m_formats.size() << " formats"
<< dendl;
if (m_image_ctx->encryption_format.get() != nullptr) {
lderr(m_image_ctx->cct) << "encryption already loaded" << dendl;
finish(-EEXIST);
return;
}
auto ictx = m_image_ctx;
while (ictx != nullptr) {
if (ictx->test_features(RBD_FEATURE_JOURNALING)) {
lderr(m_image_ctx->cct) << "cannot use encryption with journal."
<< " image name: " << ictx->name << dendl;
finish(-ENOTSUP);
return;
}
ictx = ictx->parent;
}
m_current_image_ctx = m_image_ctx;
flush();
}
template <typename I>
void LoadRequest<I>::flush() {
auto ctx = create_context_callback<
LoadRequest<I>, &LoadRequest<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 LoadRequest<I>::handle_flush(int r) {
ldout(m_image_ctx->cct, 20) << "r=" << r << dendl;
if (r < 0) {
lderr(m_image_ctx->cct) << "failed to flush image" << dendl;
finish(r);
return;
}
load();
}
template <typename I>
void LoadRequest<I>::load() {
ldout(m_image_ctx->cct, 20) << "format_idx=" << m_format_idx << dendl;
m_detected_format_name = "";
auto ctx = create_context_callback<
LoadRequest<I>, &LoadRequest<I>::handle_load>(this);
m_formats[m_format_idx]->load(m_current_image_ctx, &m_detected_format_name,
ctx);
}
template <typename I>
void LoadRequest<I>::handle_load(int r) {
ldout(m_image_ctx->cct, 20) << "r=" << r << dendl;
if (r < 0) {
if (m_is_current_format_cloned &&
m_detected_format_name == UNKNOWN_FORMAT) {
// encryption format was not detected, assume plaintext
ldout(m_image_ctx->cct, 5) << "assuming plaintext for image "
<< m_current_image_ctx->name << dendl;
m_formats.pop_back();
invalidate_cache();
return;
}
lderr(m_image_ctx->cct) << "failed to load encryption. image name: "
<< m_current_image_ctx->name << dendl;
finish(r);
return;
}
ldout(m_image_ctx->cct, 5) << "loaded format " << m_detected_format_name
<< (m_is_current_format_cloned ? " (cloned)" : "")
<< " for image " << m_current_image_ctx->name
<< dendl;
m_format_idx++;
m_current_image_ctx = m_current_image_ctx->parent;
if (m_current_image_ctx != nullptr) {
// move on to loading parent
if (m_format_idx >= m_formats.size()) {
// try to load next ancestor using the same format
ldout(m_image_ctx->cct, 20) << "cloning format" << dendl;
m_is_current_format_cloned = true;
m_formats.push_back(m_formats[m_formats.size() - 1]->clone());
}
load();
} else {
if (m_formats.size() != m_format_idx) {
lderr(m_image_ctx->cct) << "got " << m_formats.size()
<< " encryption specs to load, "
<< "but image has " << m_format_idx - 1
<< " ancestors" << dendl;
finish(-EINVAL);
return;
}
invalidate_cache();
}
}
template <typename I>
void LoadRequest<I>::invalidate_cache() {
auto ctx = create_context_callback<
LoadRequest<I>, &LoadRequest<I>::handle_invalidate_cache>(this);
m_image_ctx->io_image_dispatcher->invalidate_cache(ctx);
}
template <typename I>
void LoadRequest<I>::handle_invalidate_cache(int r) {
ldout(m_image_ctx->cct, 20) << "r=" << r << dendl;
if (r < 0) {
lderr(m_image_ctx->cct) << "failed to invalidate image cache" << dendl;
}
finish(r);
}
template <typename I>
void LoadRequest<I>::finish(int r) {
ldout(m_image_ctx->cct, 20) << "r=" << r << dendl;
if (r == 0) {
auto ictx = m_image_ctx;
for (auto& format : m_formats) {
util::set_crypto(ictx, std::move(format));
ictx = ictx->parent;
}
}
m_on_finish->complete(r);
delete this;
}
} // namespace crypto
} // namespace librbd
template class librbd::crypto::LoadRequest<librbd::ImageCtx>;
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