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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/Notifier.h"
#include "common/WorkQueue.h"
#include "librbd/ImageCtx.h"
#include "librbd/Utils.h"
#include "librbd/watcher/Types.h"
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::watcher::Notifier: " \
<< this << " " << __func__ << ": "
namespace librbd {
namespace watcher {
const uint64_t Notifier::NOTIFY_TIMEOUT = 5000;
Notifier::C_AioNotify::C_AioNotify(Notifier *notifier, NotifyResponse *response,
Context *on_finish)
: notifier(notifier), response(response), on_finish(on_finish) {
}
void Notifier::C_AioNotify::finish(int r) {
if (response != nullptr) {
if (r == 0 || r == -ETIMEDOUT) {
try {
auto it = out_bl.cbegin();
decode(*response, it);
} catch (const buffer::error &err) {
r = -EBADMSG;
}
}
}
notifier->handle_notify(r, on_finish);
}
Notifier::Notifier(ContextWQ *work_queue, IoCtx &ioctx, const std::string &oid)
: m_work_queue(work_queue), m_ioctx(ioctx), m_oid(oid),
m_aio_notify_lock(util::unique_lock_name(
"librbd::object_watcher::Notifier::m_aio_notify_lock", this)) {
m_cct = reinterpret_cast<CephContext *>(m_ioctx.cct());
}
Notifier::~Notifier() {
Mutex::Locker aio_notify_locker(m_aio_notify_lock);
ceph_assert(m_pending_aio_notifies == 0);
}
void Notifier::flush(Context *on_finish) {
Mutex::Locker aio_notify_locker(m_aio_notify_lock);
if (m_pending_aio_notifies == 0) {
m_work_queue->queue(on_finish, 0);
return;
}
m_aio_notify_flush_ctxs.push_back(on_finish);
}
void Notifier::notify(bufferlist &bl, NotifyResponse *response,
Context *on_finish) {
{
Mutex::Locker aio_notify_locker(m_aio_notify_lock);
++m_pending_aio_notifies;
ldout(m_cct, 20) << "pending=" << m_pending_aio_notifies << dendl;
}
C_AioNotify *ctx = new C_AioNotify(this, response, on_finish);
librados::AioCompletion *comp = util::create_rados_callback(ctx);
int r = m_ioctx.aio_notify(m_oid, comp, bl, NOTIFY_TIMEOUT, &ctx->out_bl);
ceph_assert(r == 0);
comp->release();
}
void Notifier::handle_notify(int r, Context *on_finish) {
ldout(m_cct, 20) << "r=" << r << dendl;
Mutex::Locker aio_notify_locker(m_aio_notify_lock);
ceph_assert(m_pending_aio_notifies > 0);
--m_pending_aio_notifies;
ldout(m_cct, 20) << "pending=" << m_pending_aio_notifies << dendl;
if (m_pending_aio_notifies == 0) {
for (auto ctx : m_aio_notify_flush_ctxs) {
m_work_queue->queue(ctx, 0);
}
m_aio_notify_flush_ctxs.clear();
}
if (on_finish != nullptr) {
m_work_queue->queue(on_finish, r);
}
}
} // namespace watcher
} // namespace librbd
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