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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_context.h"
#include "common/ceph_json.h"
#include "common/debug.h"
#include "common/errno.h"
#include "common/WorkQueue.h"
#include "cls/cephfs/cls_cephfs_client.h"
#include "include/stringify.h"
#include "aio_utils.h"
#include "InstanceWatcher.h"
#include "Types.h"
#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_cephfs_mirror
#undef dout_prefix
#define dout_prefix *_dout << "cephfs::mirror::InstanceWatcher " << __func__
namespace cephfs {
namespace mirror {
namespace {
std::string instance_oid(const std::string &instance_id) {
return CEPHFS_MIRROR_OBJECT + "." + instance_id;
}
} // anonymous namespace
InstanceWatcher::InstanceWatcher(librados::IoCtx &ioctx,
Listener &listener, ContextWQ *work_queue)
: Watcher(ioctx, instance_oid(stringify(ioctx.get_instance_id())), work_queue),
m_ioctx(ioctx),
m_listener(listener),
m_work_queue(work_queue),
m_lock(ceph::make_mutex("cephfs::mirror::instance_watcher")) {
}
InstanceWatcher::~InstanceWatcher() {
}
void InstanceWatcher::init(Context *on_finish) {
dout(20) << dendl;
{
std::scoped_lock locker(m_lock);
ceph_assert(m_on_init_finish == nullptr);
m_on_init_finish = new LambdaContext([this, on_finish](int r) {
on_finish->complete(r);
if (m_on_shutdown_finish != nullptr) {
m_on_shutdown_finish->complete(0);
}
});
}
create_instance();
}
void InstanceWatcher::shutdown(Context *on_finish) {
dout(20) << dendl;
{
std::scoped_lock locker(m_lock);
ceph_assert(m_on_shutdown_finish == nullptr);
if (m_on_init_finish != nullptr) {
dout(10) << ": delaying shutdown -- init in progress" << dendl;
m_on_shutdown_finish = new LambdaContext([this, on_finish](int r) {
m_on_shutdown_finish = nullptr;
shutdown(on_finish);
});
return;
}
m_on_shutdown_finish = on_finish;
}
unregister_watcher();
}
void InstanceWatcher::handle_notify(uint64_t notify_id, uint64_t handle,
uint64_t notifier_id, bufferlist& bl) {
dout(20) << dendl;
std::string dir_path;
std::string mode;
try {
JSONDecoder jd(bl);
JSONDecoder::decode_json("dir_path", dir_path, &jd.parser, true);
JSONDecoder::decode_json("mode", mode, &jd.parser, true);
} catch (const JSONDecoder::err &e) {
derr << ": failed to decode notify json: " << e.what() << dendl;
}
dout(20) << ": notifier_id=" << notifier_id << ", dir_path=" << dir_path
<< ", mode=" << mode << dendl;
if (mode == "acquire") {
m_listener.acquire_directory(dir_path);
} else if (mode == "release") {
m_listener.release_directory(dir_path);
} else {
derr << ": unknown mode" << dendl;
}
bufferlist outbl;
acknowledge_notify(notify_id, handle, outbl);
}
void InstanceWatcher::handle_rewatch_complete(int r) {
dout(5) << ": r=" << r << dendl;
if (r == -EBLOCKLISTED) {
dout(0) << ": client blocklisted" <<dendl;
std::scoped_lock locker(m_lock);
m_blocklisted = true;
} else if (r == -ENOENT) {
derr << ": mirroring object deleted" << dendl;
m_failed = true;
} else if (r < 0) {
derr << ": rewatch error: " << cpp_strerror(r) << dendl;
m_failed = true;
}
}
void InstanceWatcher::create_instance() {
dout(20) << dendl;
std::scoped_lock locker(m_lock);
librados::ObjectWriteOperation op;
op.create(false);
librados::AioCompletion *aio_comp =
librados::Rados::aio_create_completion(
this, &rados_callback<InstanceWatcher, &InstanceWatcher::handle_create_instance>);
int r = m_ioctx.aio_operate(m_oid, aio_comp, &op);
ceph_assert(r == 0);
aio_comp->release();
}
void InstanceWatcher::handle_create_instance(int r) {
dout(20) << ": r=" << r << dendl;
Context *on_init_finish = nullptr;
{
std::scoped_lock locker(m_lock);
if (r < 0) {
std::swap(on_init_finish, m_on_init_finish);
}
}
if (on_init_finish != nullptr) {
on_init_finish->complete(r);
return;
}
register_watcher();
}
void InstanceWatcher::register_watcher() {
dout(20) << dendl;
std::scoped_lock locker(m_lock);
Context *on_finish = new C_CallbackAdapter<
InstanceWatcher, &InstanceWatcher::handle_register_watcher>(this);
register_watch(on_finish);
}
void InstanceWatcher::handle_register_watcher(int r) {
dout(20) << ": r=" << r << dendl;
Context *on_init_finish = nullptr;
{
std::scoped_lock locker(m_lock);
if (r == 0) {
std::swap(on_init_finish, m_on_init_finish);
}
}
if (on_init_finish != nullptr) {
on_init_finish->complete(r);
return;
}
remove_instance();
}
void InstanceWatcher::unregister_watcher() {
dout(20) << dendl;
std::scoped_lock locker(m_lock);
Context *on_finish = new C_CallbackAdapter<
InstanceWatcher, &InstanceWatcher::handle_unregister_watcher>(this);
unregister_watch(new C_AsyncCallback<ContextWQ>(m_work_queue, on_finish));
}
void InstanceWatcher::handle_unregister_watcher(int r) {
dout(20) << ": r=" << r << dendl;
Context *on_shutdown_finish = nullptr;
{
std::scoped_lock locker(m_lock);
if (r < 0) {
std::swap(on_shutdown_finish, m_on_shutdown_finish);
}
}
if (on_shutdown_finish != nullptr) {
on_shutdown_finish->complete(r);
return;
}
remove_instance();
}
void InstanceWatcher::remove_instance() {
dout(20) << dendl;
std::scoped_lock locker(m_lock);
librados::ObjectWriteOperation op;
op.remove();
librados::AioCompletion *aio_comp =
librados::Rados::aio_create_completion(
this, &rados_callback<InstanceWatcher, &InstanceWatcher::handle_remove_instance>);
int r = m_ioctx.aio_operate(m_oid, aio_comp, &op);
ceph_assert(r == 0);
aio_comp->release();
}
void InstanceWatcher::handle_remove_instance(int r) {
dout(20) << ": r=" << r << dendl;
Context *on_init_finish = nullptr;
Context *on_shutdown_finish = nullptr;
{
std::scoped_lock locker(m_lock);
std::swap(on_init_finish, m_on_init_finish);
std::swap(on_shutdown_finish, m_on_shutdown_finish);
}
if (on_init_finish != nullptr) {
on_init_finish->complete(r);
}
if (on_shutdown_finish != nullptr) {
on_shutdown_finish->complete(r);
}
}
} // namespace mirror
} // namespace cephfs
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