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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/watcher/RewatchRequest.h"
#include "common/ceph_mutex.h"
#include "common/errno.h"
#include "librbd/Utils.h"
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::watcher::RewatchRequest: " \
<< this << " " << __func__ << " "
namespace librbd {
using util::create_context_callback;
using util::create_rados_callback;
namespace watcher {
using std::string;
RewatchRequest::RewatchRequest(librados::IoCtx& ioctx, const string& oid,
ceph::shared_mutex &watch_lock,
librados::WatchCtx2 *watch_ctx,
uint64_t *watch_handle, Context *on_finish)
: m_ioctx(ioctx), m_oid(oid), m_watch_lock(watch_lock),
m_watch_ctx(watch_ctx), m_watch_handle(watch_handle),
m_on_finish(on_finish) {
}
void RewatchRequest::send() {
unwatch();
}
void RewatchRequest::unwatch() {
ceph_assert(ceph_mutex_is_wlocked(m_watch_lock));
if (*m_watch_handle == 0) {
rewatch();
return;
}
CephContext *cct = reinterpret_cast<CephContext *>(m_ioctx.cct());
ldout(cct, 10) << dendl;
uint64_t watch_handle = 0;
std::swap(*m_watch_handle, watch_handle);
librados::AioCompletion *aio_comp = create_rados_callback<
RewatchRequest, &RewatchRequest::handle_unwatch>(this);
int r = m_ioctx.aio_unwatch(watch_handle, aio_comp);
ceph_assert(r == 0);
aio_comp->release();
}
void RewatchRequest::handle_unwatch(int r) {
CephContext *cct = reinterpret_cast<CephContext *>(m_ioctx.cct());
ldout(cct, 10) << "r=" << r << dendl;
if (r == -EBLOCKLISTED) {
lderr(cct) << "client blocklisted" << dendl;
finish(r);
return;
} else if (r < 0) {
lderr(cct) << "failed to unwatch: " << cpp_strerror(r) << dendl;
}
rewatch();
}
void RewatchRequest::rewatch() {
CephContext *cct = reinterpret_cast<CephContext *>(m_ioctx.cct());
ldout(cct, 10) << dendl;
librados::AioCompletion *aio_comp = create_rados_callback<
RewatchRequest, &RewatchRequest::handle_rewatch>(this);
int r = m_ioctx.aio_watch(m_oid, aio_comp, &m_rewatch_handle, m_watch_ctx);
ceph_assert(r == 0);
aio_comp->release();
}
void RewatchRequest::handle_rewatch(int r) {
CephContext *cct = reinterpret_cast<CephContext *>(m_ioctx.cct());
ldout(cct, 10) << "r=" << r << dendl;
if (r < 0) {
lderr(cct) << "failed to watch object: " << cpp_strerror(r)
<< dendl;
m_rewatch_handle = 0;
}
{
std::unique_lock watch_locker{m_watch_lock};
*m_watch_handle = m_rewatch_handle;
}
finish(r);
}
void RewatchRequest::finish(int r) {
CephContext *cct = reinterpret_cast<CephContext *>(m_ioctx.cct());
ldout(cct, 10) << "r=" << r << dendl;
m_on_finish->complete(r);
delete this;
}
} // namespace watcher
} // namespace librbd
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