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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/ceph_mutex.h"
#include "common/debug.h"
#include "common/errno.h"
#include "include/Context.h"
#include "tools/cephfs_mirror/aio_utils.h"
#include "RewatchRequest.h"
#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_cephfs_mirror
#undef dout_prefix
#define dout_prefix *_dout << "cephfs::mirror::watcher:RewatchRequest " << __func__
namespace cephfs {
namespace mirror {
namespace watcher {
RewatchRequest::RewatchRequest(librados::IoCtx &ioctx, const std::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_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_lock));
if (*m_watch_handle == 0) {
rewatch();
return;
}
dout(10) << dendl;
uint64_t watch_handle = 0;
std::swap(*m_watch_handle, watch_handle);
librados::AioCompletion *aio_comp =
librados::Rados::aio_create_completion(
this, &rados_callback<RewatchRequest, &RewatchRequest::handle_unwatch>);
int r = m_ioctx.aio_unwatch(watch_handle, aio_comp);
ceph_assert(r == 0);
aio_comp->release();
}
void RewatchRequest::handle_unwatch(int r) {
dout(20) << ": r=" << r << dendl;
if (r == -EBLOCKLISTED) {
derr << ": client blocklisted" << dendl;
finish(r);
return;
} else if (r < 0) {
derr << ": failed to unwatch: " << cpp_strerror(r) << dendl;
}
rewatch();
}
void RewatchRequest::rewatch() {
dout(20) << dendl;
librados::AioCompletion *aio_comp =
librados::Rados::aio_create_completion(
this, &rados_callback<RewatchRequest, &RewatchRequest::handle_rewatch>);
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) {
dout(20) << ": r=" << r << dendl;
if (r < 0) {
derr << ": failed to watch object: " << cpp_strerror(r) << dendl;
m_rewatch_handle = 0;
}
{
std::unique_lock locker(m_lock);
*m_watch_handle = m_rewatch_handle;
}
finish(r);
}
void RewatchRequest::finish(int r) {
dout(20) << ": r=" << r << dendl;
m_on_finish->complete(r);
delete this;
}
} // namespace watcher
} // namespace mirror
} // namespace cephfs
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