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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/cache/Types.h"
#include "librbd/cache/Utils.h"
#include "librbd/cache/pwl/ImageCacheState.h"
#include "librbd/ImageCtx.h"
#include "librbd/Operations.h"
#include "common/config_proxy.h"
#include "common/environment.h"
#include "common/hostname.h"
#include "librbd/plugin/Api.h"
#undef dout_subsys
#define dout_subsys ceph_subsys_rbd_pwl
#undef dout_prefix
#define dout_prefix *_dout << "librbd::cache::pwl::ImageCacheState: " \
<< __func__ << ": "
namespace librbd {
namespace cache {
namespace pwl {
using namespace std;
template <typename I>
void ImageCacheState<I>::init_from_config() {
ldout(m_image_ctx->cct, 20) << dendl;
present = false;
empty = true;
clean = true;
host = "";
path = "";
ConfigProxy &config = m_image_ctx->config;
mode = config.get_val<std::string>("rbd_persistent_cache_mode");
size = 0;
}
template <typename I>
bool ImageCacheState<I>::init_from_metadata(json_spirit::mValue& json_root) {
ldout(m_image_ctx->cct, 20) << dendl;
try {
auto& o = json_root.get_obj();
present = o["present"].get_bool();
empty = o["empty"].get_bool();
clean = o["clean"].get_bool();
host = o["host"].get_str();
path = o["path"].get_str();
mode = o["mode"].get_str();
size = o["size"].get_uint64();
} catch (std::runtime_error& e) {
lderr(m_image_ctx->cct) << "failed to parse cache state: " << e.what()
<< dendl;
return false;
}
return true;
}
template <typename I>
void ImageCacheState<I>::write_image_cache_state(std::unique_lock<ceph::mutex>& locker,
Context *on_finish) {
ceph_assert(ceph_mutex_is_locked_by_me(*locker.mutex()));
stats_timestamp = ceph_clock_now();
json_spirit::mObject o;
o["present"] = present;
o["empty"] = empty;
o["clean"] = clean;
o["host"] = host;
o["path"] = path;
o["mode"] = mode;
o["size"] = size;
o["stats_timestamp"] = stats_timestamp.sec();
o["allocated_bytes"] = allocated_bytes;
o["cached_bytes"] = cached_bytes;
o["dirty_bytes"] = dirty_bytes;
o["free_bytes"] = free_bytes;
o["hits_full"] = hits_full;
o["hits_partial"] = hits_partial;
o["misses"] = misses;
o["hit_bytes"] = hit_bytes;
o["miss_bytes"] = miss_bytes;
std::string image_state_json = json_spirit::write(o);
locker.unlock();
std::shared_lock owner_lock{m_image_ctx->owner_lock};
ldout(m_image_ctx->cct, 20) << __func__ << " Store state: "
<< image_state_json << dendl;
m_plugin_api.execute_image_metadata_set(m_image_ctx, PERSISTENT_CACHE_STATE,
image_state_json, on_finish);
}
template <typename I>
void ImageCacheState<I>::clear_image_cache_state(Context *on_finish) {
std::shared_lock owner_lock{m_image_ctx->owner_lock};
ldout(m_image_ctx->cct, 20) << __func__ << " Remove state: " << dendl;
m_plugin_api.execute_image_metadata_remove(
m_image_ctx, PERSISTENT_CACHE_STATE, on_finish);
}
template <typename I>
ImageCacheState<I>* ImageCacheState<I>::create_image_cache_state(
I* image_ctx, plugin::Api<I>& plugin_api, int &r) {
std::string cache_state_str;
ImageCacheState<I>* cache_state = nullptr;
r = 0;
bool dirty_cache = plugin_api.test_image_features(image_ctx, RBD_FEATURE_DIRTY_CACHE);
if (dirty_cache) {
cls_client::metadata_get(&image_ctx->md_ctx, image_ctx->header_oid,
PERSISTENT_CACHE_STATE, &cache_state_str);
}
ldout(image_ctx->cct, 20) << "image_cache_state: " << cache_state_str << dendl;
bool pwl_enabled = cache::util::is_pwl_enabled(*image_ctx);
bool cache_desired = pwl_enabled;
cache_desired &= !image_ctx->read_only;
cache_desired &= !plugin_api.test_image_features(image_ctx, RBD_FEATURE_MIGRATING);
cache_desired &= !plugin_api.test_image_features(image_ctx, RBD_FEATURE_JOURNALING);
cache_desired &= !image_ctx->old_format;
if (!dirty_cache && !cache_desired) {
ldout(image_ctx->cct, 20) << "Do not desire to use image cache." << dendl;
} else if (dirty_cache && !cache_desired) {
lderr(image_ctx->cct) << "There's a dirty cache, but RWL cache is disabled."
<< dendl;
r = -EINVAL;
}else if ((!dirty_cache || cache_state_str.empty()) && cache_desired) {
cache_state = new ImageCacheState<I>(image_ctx, plugin_api);
cache_state->init_from_config();
} else {
ceph_assert(!cache_state_str.empty());
json_spirit::mValue json_root;
if (!json_spirit::read(cache_state_str.c_str(), json_root)) {
lderr(image_ctx->cct) << "failed to parse cache state" << dendl;
r = -EINVAL;
return nullptr;
}
cache_state = new ImageCacheState<I>(image_ctx, plugin_api);
if (!cache_state->init_from_metadata(json_root)) {
delete cache_state;
r = -EINVAL;
return nullptr;
}
if (!cache_state->present) {
cache_state->init_from_config();
}
}
return cache_state;
}
template <typename I>
ImageCacheState<I>* ImageCacheState<I>::get_image_cache_state(
I* image_ctx, plugin::Api<I>& plugin_api) {
ImageCacheState<I>* cache_state = nullptr;
string cache_state_str;
cls_client::metadata_get(&image_ctx->md_ctx, image_ctx->header_oid,
PERSISTENT_CACHE_STATE, &cache_state_str);
if (!cache_state_str.empty()) {
// ignore errors, best effort
cache_state = new ImageCacheState<I>(image_ctx, plugin_api);
json_spirit::mValue json_root;
if (!json_spirit::read(cache_state_str.c_str(), json_root)) {
lderr(image_ctx->cct) << "failed to parse cache state" << dendl;
} else {
cache_state->init_from_metadata(json_root);
}
}
return cache_state;
}
template <typename I>
bool ImageCacheState<I>::is_valid() {
if (this->present &&
(host.compare(ceph_get_short_hostname()) != 0)) {
auto cleanstring = "dirty";
if (this->clean) {
cleanstring = "clean";
}
lderr(m_image_ctx->cct) << "An image cache (RWL) remains on another host "
<< host << " which is " << cleanstring
<< ". Flush/close the image there to remove the "
<< "image cache" << dendl;
return false;
}
return true;
}
} // namespace pwl
} // namespace cache
} // namespace librbd
template class librbd::cache::pwl::ImageCacheState<librbd::ImageCtx>;
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