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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "common/debug.h"
#include "common/errno.h"
#include "librbd/Utils.h"
#include "include/rbd_types.h"
#include "cls/rbd/cls_rbd_client.h"
#include "UpdateRequest.h"
#include "LoadRequest.h"
#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_rbd_mirror
#undef dout_prefix
#define dout_prefix *_dout << "rbd::mirror::image_map::LoadRequest: " \
<< this << " " << __func__
namespace rbd {
namespace mirror {
namespace image_map {
static const uint32_t MAX_RETURN = 1024;
using librbd::util::create_rados_callback;
using librbd::util::create_context_callback;
template<typename I>
LoadRequest<I>::LoadRequest(librados::IoCtx &ioctx,
std::map<std::string, cls::rbd::MirrorImageMap> *image_mapping,
Context *on_finish)
: m_ioctx(ioctx),
m_image_mapping(image_mapping),
m_on_finish(on_finish) {
}
template<typename I>
void LoadRequest<I>::send() {
dout(20) << dendl;
image_map_list();
}
template<typename I>
void LoadRequest<I>::image_map_list() {
dout(20) << dendl;
librados::ObjectReadOperation op;
librbd::cls_client::mirror_image_map_list_start(&op, m_start_after, MAX_RETURN);
librados::AioCompletion *aio_comp = create_rados_callback<
LoadRequest, &LoadRequest::handle_image_map_list>(this);
m_out_bl.clear();
int r = m_ioctx.aio_operate(RBD_MIRROR_LEADER, aio_comp, &op, &m_out_bl);
ceph_assert(r == 0);
aio_comp->release();
}
template<typename I>
void LoadRequest<I>::handle_image_map_list(int r) {
dout(20) << ": r=" << r << dendl;
std::map<std::string, cls::rbd::MirrorImageMap> image_mapping;
if (r == 0) {
auto it = m_out_bl.cbegin();
r = librbd::cls_client::mirror_image_map_list_finish(&it, &image_mapping);
}
if (r < 0) {
derr << ": failed to get image map: " << cpp_strerror(r) << dendl;
finish(r);
return;
}
m_image_mapping->insert(image_mapping.begin(), image_mapping.end());
if (image_mapping.size() == MAX_RETURN) {
m_start_after = image_mapping.rbegin()->first;
image_map_list();
return;
}
mirror_image_list();
}
template<typename I>
void LoadRequest<I>::mirror_image_list() {
dout(20) << dendl;
librados::ObjectReadOperation op;
librbd::cls_client::mirror_image_list_start(&op, m_start_after, MAX_RETURN);
m_out_bl.clear();
librados::AioCompletion *aio_comp = create_rados_callback<
LoadRequest<I>,
&LoadRequest<I>::handle_mirror_image_list>(this);
int r = m_ioctx.aio_operate(RBD_MIRRORING, aio_comp, &op, &m_out_bl);
ceph_assert(r == 0);
aio_comp->release();
}
template<typename I>
void LoadRequest<I>::handle_mirror_image_list(int r) {
dout(20) << ": r=" << r << dendl;
std::map<std::string, std::string> ids;
if (r == 0) {
auto it = m_out_bl.cbegin();
r = librbd::cls_client::mirror_image_list_finish(&it, &ids);
}
if (r < 0 && r != -ENOENT) {
derr << "failed to list mirrored images: " << cpp_strerror(r) << dendl;
finish(r);
return;
}
for (auto &id : ids) {
m_global_image_ids.emplace(id.second);
}
if (ids.size() == MAX_RETURN) {
m_start_after = ids.rbegin()->first;
mirror_image_list();
return;
}
cleanup_image_map();
}
template<typename I>
void LoadRequest<I>::cleanup_image_map() {
dout(20) << dendl;
std::set<std::string> map_removals;
auto it = m_image_mapping->begin();
while (it != m_image_mapping->end()) {
if (m_global_image_ids.count(it->first) > 0) {
++it;
continue;
}
map_removals.emplace(it->first);
it = m_image_mapping->erase(it);
}
if (map_removals.size() == 0) {
finish(0);
return;
}
auto ctx = create_context_callback<
LoadRequest<I>,
&LoadRequest<I>::finish>(this);
image_map::UpdateRequest<I> *req = image_map::UpdateRequest<I>::create(
m_ioctx, {}, std::move(map_removals), ctx);
req->send();
}
template<typename I>
void LoadRequest<I>::finish(int r) {
dout(20) << ": r=" << r << dendl;
m_on_finish->complete(r);
delete this;
}
} // namespace image_map
} // namespace mirror
} // namespace rbd
template class rbd::mirror::image_map::LoadRequest<librbd::ImageCtx>;
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