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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/image/GetMetadataRequest.h"
#include "cls/rbd/cls_rbd_client.h"
#include "common/dout.h"
#include "common/errno.h"
#include "include/ceph_assert.h"
#include "librbd/ImageCtx.h"
#include "librbd/Utils.h"
#include <boost/algorithm/string/predicate.hpp>
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::image::GetMetadataRequest: " \
<< this << " " << __func__ << ": "
#define MAX_KEYS 64U
namespace librbd {
namespace image {
namespace {
static const std::string INTERNAL_KEY_PREFIX{".rbd"};
} // anonymous namespace
using util::create_rados_callback;
template <typename I>
GetMetadataRequest<I>::GetMetadataRequest(
IoCtx &io_ctx, const std::string &oid, bool filter_internal,
const std::string& filter_key_prefix, const std::string& last_key,
uint32_t max_results, KeyValues* key_values, Context *on_finish)
: m_io_ctx(io_ctx), m_oid(oid), m_filter_internal(filter_internal),
m_filter_key_prefix(filter_key_prefix), m_last_key(last_key),
m_max_results(max_results), m_key_values(key_values),
m_on_finish(on_finish),
m_cct(reinterpret_cast<CephContext*>(m_io_ctx.cct())) {
}
template <typename I>
void GetMetadataRequest<I>::send() {
metadata_list();
}
template <typename I>
void GetMetadataRequest<I>::metadata_list() {
ldout(m_cct, 15) << "start_key=" << m_last_key << dendl;
m_expected_results = MAX_KEYS;
if (m_max_results > 0) {
m_expected_results = std::min<uint32_t>(
m_expected_results, m_max_results - m_key_values->size());
}
librados::ObjectReadOperation op;
cls_client::metadata_list_start(&op, m_last_key, m_expected_results);
auto aio_comp = create_rados_callback<
GetMetadataRequest<I>, &GetMetadataRequest<I>::handle_metadata_list>(this);
m_out_bl.clear();
m_io_ctx.aio_operate(m_oid, aio_comp, &op, &m_out_bl);
aio_comp->release();
}
template <typename I>
void GetMetadataRequest<I>::handle_metadata_list(int r) {
ldout(m_cct, 15) << "r=" << r << dendl;
KeyValues metadata;
if (r == 0) {
auto it = m_out_bl.cbegin();
r = cls_client::metadata_list_finish(&it, &metadata);
}
if (r == -ENOENT || r == -EOPNOTSUPP) {
finish(0);
return;
} else if (r < 0) {
lderr(m_cct) << "failed to retrieve image metadata: " << cpp_strerror(r)
<< dendl;
finish(r);
return;
}
for (auto it = metadata.begin(); it != metadata.end(); ++it) {
if (m_filter_internal &&
boost::starts_with(it->first, INTERNAL_KEY_PREFIX)) {
continue;
} else if (!m_filter_key_prefix.empty() &&
!boost::starts_with(it->first, m_filter_key_prefix)) {
continue;
}
m_key_values->insert({it->first, std::move(it->second)});
}
if (!metadata.empty()) {
m_last_key = metadata.rbegin()->first;
}
if (metadata.size() == m_expected_results &&
(m_max_results == 0 || m_key_values->size() < m_max_results)) {
metadata_list();
return;
}
finish(0);
}
template <typename I>
void GetMetadataRequest<I>::finish(int r) {
ldout(m_cct, 15) << "r=" << r << dendl;
m_on_finish->complete(r);
delete this;
}
} // namespace image
} // namespace librbd
template class librbd::image::GetMetadataRequest<librbd::ImageCtx>;
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