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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include <filesystem>
#include "common/dout.h"
#include "common/errno.h"
#include "common/hostname.h"
#include "librbd/asio/ContextWQ.h"
#include "librbd/cache/pwl/DiscardRequest.h"
#include "librbd/cache/pwl/ImageCacheState.h"
#include "librbd/cache/Types.h"
#include "librbd/io/ImageDispatcherInterface.h"
#include "librbd/ImageCtx.h"
#include "librbd/Utils.h"
#define dout_subsys ceph_subsys_rbd_pwl
#undef dout_prefix
#define dout_prefix *_dout << "librbd::cache::pwl:DiscardRequest: " \
<< this << " " << __func__ << ": "
namespace fs = std::filesystem;
namespace librbd {
namespace cache {
namespace pwl {
using librbd::util::create_async_context_callback;
using librbd::util::create_context_callback;
template <typename I>
DiscardRequest<I>* DiscardRequest<I>::create(
I &image_ctx,
plugin::Api<I>& plugin_api,
Context *on_finish) {
return new DiscardRequest(image_ctx, plugin_api, on_finish);
}
template <typename I>
DiscardRequest<I>::DiscardRequest(
I &image_ctx,
plugin::Api<I>& plugin_api,
Context *on_finish)
: m_image_ctx(image_ctx),
m_plugin_api(plugin_api),
m_on_finish(create_async_context_callback(image_ctx, on_finish)),
m_error_result(0) {
}
template <typename I>
void DiscardRequest<I>::send() {
delete_image_cache_file();
}
template <typename I>
void DiscardRequest<I>::delete_image_cache_file() {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 10) << dendl;
m_cache_state = ImageCacheState<I>::get_image_cache_state(&m_image_ctx, m_plugin_api);
if (!m_cache_state) {
remove_feature_bit();
return;
}
if (m_cache_state->present &&
!m_cache_state->host.compare(ceph_get_short_hostname()) &&
fs::exists(m_cache_state->path)) {
std::error_code ec;
fs::remove(m_cache_state->path, ec);
if (ec) {
lderr(cct) << "failed to remove persistent cache file: " << ec.message()
<< dendl;
// not fatal
}
}
remove_image_cache_state();
}
template <typename I>
void DiscardRequest<I>::remove_image_cache_state() {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 10) << dendl;
using klass = DiscardRequest<I>;
Context *ctx = create_context_callback<klass, &klass::handle_remove_image_cache_state>(
this);
m_cache_state->clear_image_cache_state(ctx);
}
template <typename I>
void DiscardRequest<I>::handle_remove_image_cache_state(int r) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 10) << dendl;
if (r < 0) {
lderr(cct) << "failed to remove the image cache state: " << cpp_strerror(r)
<< dendl;
save_result(r);
finish();
return;
}
remove_feature_bit();
}
template <typename I>
void DiscardRequest<I>::remove_feature_bit() {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 10) << dendl;
uint64_t new_features = m_image_ctx.features & ~RBD_FEATURE_DIRTY_CACHE;
uint64_t features_mask = RBD_FEATURE_DIRTY_CACHE;
ldout(cct, 10) << "old_features=" << m_image_ctx.features
<< ", new_features=" << new_features
<< ", features_mask=" << features_mask
<< dendl;
int r = librbd::cls_client::set_features(&m_image_ctx.md_ctx, m_image_ctx.header_oid,
new_features, features_mask);
m_image_ctx.features &= ~RBD_FEATURE_DIRTY_CACHE;
using klass = DiscardRequest<I>;
Context *ctx = create_context_callback<klass, &klass::handle_remove_feature_bit>(
this);
ctx->complete(r);
}
template <typename I>
void DiscardRequest<I>::handle_remove_feature_bit(int r) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 10) << dendl;
if (r < 0) {
lderr(cct) << "failed to remove the feature bit: " << cpp_strerror(r)
<< dendl;
save_result(r);
}
finish();
}
template <typename I>
void DiscardRequest<I>::finish() {
if (m_cache_state) {
delete m_cache_state;
m_cache_state = nullptr;
}
m_on_finish->complete(m_error_result);
delete this;
}
} // namespace pwl
} // namespace cache
} // namespace librbd
template class librbd::cache::pwl::DiscardRequest<librbd::ImageCtx>;
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