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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "ListWatchersRequest.h"
#include "common/RWLock.h"
#include "common/dout.h"
#include "common/errno.h"
#include "cls/rbd/cls_rbd_client.h"
#include "librbd/ImageCtx.h"
#include "librbd/ImageWatcher.h"
#include "librbd/Utils.h"
#include <algorithm>
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::image::ListWatchersRequest: " << this \
<< " " << __func__ << ": "
static std::ostream& operator<<(std::ostream& os, const obj_watch_t& watch) {
os << "{addr=" << watch.addr << ", "
<< "watcher_id=" << watch.watcher_id << ", "
<< "cookie=" << watch.cookie << "}";
return os;
}
namespace librbd {
namespace image {
using librados::IoCtx;
using util::create_rados_callback;
template<typename I>
ListWatchersRequest<I>::ListWatchersRequest(I &image_ctx, int flags,
std::list<obj_watch_t> *watchers,
Context *on_finish)
: m_image_ctx(image_ctx), m_flags(flags), m_watchers(watchers),
m_on_finish(on_finish), m_cct(m_image_ctx.cct) {
ceph_assert((m_flags & LIST_WATCHERS_FILTER_OUT_MIRROR_INSTANCES) == 0 ||
(m_flags & LIST_WATCHERS_MIRROR_INSTANCES_ONLY) == 0);
}
template<typename I>
void ListWatchersRequest<I>::send() {
ldout(m_cct, 20) << dendl;
list_image_watchers();
}
template<typename I>
void ListWatchersRequest<I>::list_image_watchers() {
ldout(m_cct, 20) << dendl;
librados::ObjectReadOperation op;
op.list_watchers(&m_object_watchers, &m_ret_val);
using klass = ListWatchersRequest<I>;
librados::AioCompletion *rados_completion =
create_rados_callback<klass, &klass::handle_list_image_watchers>(this);
int r = m_image_ctx.md_ctx.aio_operate(m_image_ctx.header_oid,
rados_completion, &op, &m_out_bl);
ceph_assert(r == 0);
rados_completion->release();
}
template<typename I>
void ListWatchersRequest<I>::handle_list_image_watchers(int r) {
ldout(m_cct, 20) << "r=" << r << dendl;
if (r == 0 && m_ret_val < 0) {
r = m_ret_val;
}
if (r < 0) {
lderr(m_cct) << "error listing image watchers: " << cpp_strerror(r)
<< dendl;
finish(r);
return;
}
ldout(m_cct, 20) << "object_watchers=" << m_object_watchers << dendl;
list_mirror_watchers();
}
template<typename I>
void ListWatchersRequest<I>::list_mirror_watchers() {
if ((m_object_watchers.empty()) ||
(m_flags & (LIST_WATCHERS_FILTER_OUT_MIRROR_INSTANCES |
LIST_WATCHERS_MIRROR_INSTANCES_ONLY)) == 0) {
finish(0);
return;
}
ldout(m_cct, 20) << dendl;
librados::ObjectReadOperation op;
op.list_watchers(&m_mirror_watchers, &m_ret_val);
using klass = ListWatchersRequest<I>;
librados::AioCompletion *rados_completion =
create_rados_callback<klass, &klass::handle_list_mirror_watchers>(this);
m_out_bl.clear();
int r = m_image_ctx.md_ctx.aio_operate(RBD_MIRRORING, rados_completion,
&op, &m_out_bl);
ceph_assert(r == 0);
rados_completion->release();
}
template<typename I>
void ListWatchersRequest<I>::handle_list_mirror_watchers(int r) {
ldout(m_cct, 20) << "r=" << r << dendl;
if (r == 0 && m_ret_val < 0) {
r = m_ret_val;
}
if (r < 0 && r != -ENOENT) {
ldout(m_cct, 1) << "error listing mirror watchers: " << cpp_strerror(r)
<< dendl;
}
ldout(m_cct, 20) << "mirror_watchers=" << m_mirror_watchers << dendl;
finish(0);
}
template<typename I>
void ListWatchersRequest<I>::finish(int r) {
ldout(m_cct, 20) << "r=" << r << dendl;
if (r == 0) {
m_watchers->clear();
if (m_object_watchers.size() > 0) {
std::shared_lock owner_locker{m_image_ctx.owner_lock};
uint64_t watch_handle = m_image_ctx.image_watcher != nullptr ?
m_image_ctx.image_watcher->get_watch_handle() : 0;
for (auto &w : m_object_watchers) {
if ((m_flags & LIST_WATCHERS_FILTER_OUT_MY_INSTANCE) != 0) {
if (w.cookie == watch_handle) {
ldout(m_cct, 20) << "filtering out my instance: " << w << dendl;
continue;
}
}
auto it = std::find_if(m_mirror_watchers.begin(),
m_mirror_watchers.end(),
[w] (obj_watch_t &watcher) {
return (strncmp(w.addr, watcher.addr,
sizeof(w.addr)) == 0);
});
if ((m_flags & LIST_WATCHERS_FILTER_OUT_MIRROR_INSTANCES) != 0) {
if (it != m_mirror_watchers.end()) {
ldout(m_cct, 20) << "filtering out mirror instance: " << w << dendl;
continue;
}
} else if ((m_flags & LIST_WATCHERS_MIRROR_INSTANCES_ONLY) != 0) {
if (it == m_mirror_watchers.end()) {
ldout(m_cct, 20) << "filtering out non-mirror instance: " << w
<< dendl;
continue;
}
}
m_watchers->push_back(w);
}
}
}
m_on_finish->complete(r);
delete this;
}
} // namespace image
} // namespace librbd
template class librbd::image::ListWatchersRequest<librbd::ImageCtx>;
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