+++ /dev/null
-// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
-// vim: ts=8 sw=2 smarttab
-
-#include "librbd/Watcher.h"
-#include "librbd/watcher/RewatchRequest.h"
-#include "librbd/Utils.h"
-#include "librbd/TaskFinisher.h"
-#include "include/encoding.h"
-#include "common/errno.h"
-#include "common/WorkQueue.h"
-#include <boost/bind.hpp>
-
-// re-include our assert to clobber the system one; fix dout:
-#include "include/assert.h"
-
-#define dout_subsys ceph_subsys_rbd
-
-namespace librbd {
-
-using namespace watcher;
-
-using util::create_context_callback;
-using util::create_rados_callback;
-using std::string;
-
-namespace {
-
-struct C_UnwatchAndFlush : public Context {
- librados::Rados rados;
- Context *on_finish;
- bool flushing = false;
- int ret_val = 0;
-
- C_UnwatchAndFlush(librados::IoCtx &io_ctx, Context *on_finish)
- : rados(io_ctx), on_finish(on_finish) {
- }
-
- void complete(int r) override {
- if (ret_val == 0 && r < 0) {
- ret_val = r;
- }
-
- if (!flushing) {
- flushing = true;
-
- librados::AioCompletion *aio_comp = create_rados_callback(this);
- r = rados.aio_watch_flush(aio_comp);
- assert(r == 0);
- aio_comp->release();
- return;
- }
-
- // ensure our reference to the RadosClient is released prior
- // to completing the callback to avoid racing an explicit
- // librados shutdown
- Context *ctx = on_finish;
- r = ret_val;
- delete this;
-
- ctx->complete(r);
- }
-
- void finish(int r) override {
- }
-};
-
-} // anonymous namespace
-
-#undef dout_prefix
-#define dout_prefix *_dout << "librbd::Watcher::C_NotifyAck " << this << " " \
- << __func__ << ": "
-
-Watcher::C_NotifyAck::C_NotifyAck(Watcher *watcher, uint64_t notify_id,
- uint64_t handle)
- : watcher(watcher), cct(watcher->m_cct), notify_id(notify_id),
- handle(handle) {
- ldout(cct, 10) << "id=" << notify_id << ", " << "handle=" << handle << dendl;
-}
-
-void Watcher::C_NotifyAck::finish(int r) {
- ldout(cct, 10) << "r=" << r << dendl;
- assert(r == 0);
- watcher->acknowledge_notify(notify_id, handle, out);
-}
-
-#undef dout_prefix
-#define dout_prefix *_dout << "librbd::Watcher: " << this << " " << __func__ \
- << ": "
-
-Watcher::Watcher(librados::IoCtx& ioctx, ContextWQ *work_queue,
- const string& oid)
- : m_ioctx(ioctx), m_work_queue(work_queue), m_oid(oid),
- m_cct(reinterpret_cast<CephContext *>(ioctx.cct())),
- m_watch_lock(util::unique_lock_name("librbd::Watcher::m_watch_lock", this)),
- m_watch_handle(0), m_notifier(work_queue, ioctx, oid),
- m_watch_state(WATCH_STATE_UNREGISTERED), m_watch_ctx(*this) {
-}
-
-Watcher::~Watcher() {
- RWLock::RLocker l(m_watch_lock);
- assert(m_watch_state != WATCH_STATE_REGISTERED);
-}
-
-void Watcher::register_watch(Context *on_finish) {
- ldout(m_cct, 10) << dendl;
-
- RWLock::RLocker watch_locker(m_watch_lock);
- assert(m_watch_state == WATCH_STATE_UNREGISTERED);
- m_watch_state = WATCH_STATE_REGISTERING;
-
- librados::AioCompletion *aio_comp = create_rados_callback(
- new C_RegisterWatch(this, on_finish));
- int r = m_ioctx.aio_watch(m_oid, aio_comp, &m_watch_handle, &m_watch_ctx);
- assert(r == 0);
- aio_comp->release();
-}
-
-void Watcher::handle_register_watch(int r, Context *on_finish) {
- ldout(m_cct, 10) << "r=" << r << dendl;
- Context *unregister_watch_ctx = nullptr;
- {
- RWLock::WLocker watch_locker(m_watch_lock);
- assert(m_watch_state == WATCH_STATE_REGISTERING);
-
- std::swap(unregister_watch_ctx, m_unregister_watch_ctx);
- if (r < 0) {
- lderr(m_cct) << "failed to register watch: " << cpp_strerror(r)
- << dendl;
- m_watch_handle = 0;
- m_watch_state = WATCH_STATE_UNREGISTERED;
- } else if (r >= 0) {
- m_watch_state = WATCH_STATE_REGISTERED;
- }
- }
-
- on_finish->complete(r);
-
- // wake up pending unregister request
- if (unregister_watch_ctx != nullptr) {
- unregister_watch_ctx->complete(0);
- }
-}
-
-void Watcher::unregister_watch(Context *on_finish) {
- ldout(m_cct, 10) << dendl;
-
- {
- RWLock::WLocker watch_locker(m_watch_lock);
- if (m_watch_state == WATCH_STATE_REGISTERING ||
- m_watch_state == WATCH_STATE_REWATCHING) {
- ldout(m_cct, 10) << "delaying unregister until register completed"
- << dendl;
-
- assert(m_unregister_watch_ctx == nullptr);
- m_unregister_watch_ctx = new FunctionContext([this, on_finish](int r) {
- unregister_watch(on_finish);
- });
- return;
- }
-
- if (m_watch_state == WATCH_STATE_REGISTERED ||
- m_watch_state == WATCH_STATE_ERROR) {
- m_watch_state = WATCH_STATE_UNREGISTERED;
-
- librados::AioCompletion *aio_comp = create_rados_callback(
- new C_UnwatchAndFlush(m_ioctx, on_finish));
- int r = m_ioctx.aio_unwatch(m_watch_handle, aio_comp);
- assert(r == 0);
- aio_comp->release();
- return;
- }
- }
-
- on_finish->complete(0);
-}
-
-bool Watcher::notifications_blocked() const {
- RWLock::RLocker locker(m_watch_lock);
-
- bool blocked = (m_blocked_count > 0);
- ldout(m_cct, 5) << "blocked=" << blocked << dendl;
- return blocked;
-}
-
-void Watcher::block_notifies(Context *on_finish) {
- {
- RWLock::WLocker locker(m_watch_lock);
- ++m_blocked_count;
- ldout(m_cct, 5) << "blocked_count=" << m_blocked_count << dendl;
- }
- m_async_op_tracker.wait_for_ops(on_finish);
-}
-
-void Watcher::unblock_notifies() {
- RWLock::WLocker locker(m_watch_lock);
- assert(m_blocked_count > 0);
- --m_blocked_count;
- ldout(m_cct, 5) << "blocked_count=" << m_blocked_count << dendl;
-}
-
-void Watcher::flush(Context *on_finish) {
- m_notifier.flush(on_finish);
-}
-
-std::string Watcher::get_oid() const {
- RWLock::RLocker locker(m_watch_lock);
- return m_oid;
-}
-
-void Watcher::set_oid(const string& oid) {
- RWLock::WLocker l(m_watch_lock);
- assert(m_watch_state == WATCH_STATE_UNREGISTERED);
-
- m_oid = oid;
-}
-
-void Watcher::handle_error(uint64_t handle, int err) {
- lderr(m_cct) << "handle=" << handle << ": " << cpp_strerror(err) << dendl;
-
- RWLock::WLocker l(m_watch_lock);
- if (m_watch_state == WATCH_STATE_REGISTERED) {
- m_watch_state = WATCH_STATE_ERROR;
-
- FunctionContext *ctx = new FunctionContext(
- boost::bind(&Watcher::rewatch, this));
- m_work_queue->queue(ctx);
- }
-}
-
-void Watcher::acknowledge_notify(uint64_t notify_id, uint64_t handle,
- bufferlist &out) {
- m_ioctx.notify_ack(m_oid, notify_id, handle, out);
-}
-
-void Watcher::rewatch() {
- ldout(m_cct, 10) << dendl;
-
- RWLock::WLocker l(m_watch_lock);
- if (m_watch_state != WATCH_STATE_ERROR) {
- return;
- }
- m_watch_state = WATCH_STATE_REWATCHING;
-
- Context *ctx = create_context_callback<Watcher,
- &Watcher::handle_rewatch>(this);
- RewatchRequest *req = RewatchRequest::create(m_ioctx, m_oid, m_watch_lock,
- &m_watch_ctx,
- &m_watch_handle, ctx);
- req->send();
-}
-
-void Watcher::handle_rewatch(int r) {
- ldout(m_cct, 10) "r=" << r << dendl;
-
- WatchState next_watch_state = WATCH_STATE_REGISTERED;
- if (r < 0) {
- // only EBLACKLISTED or ENOENT can be returned
- assert(r == -EBLACKLISTED || r == -ENOENT);
- next_watch_state = WATCH_STATE_UNREGISTERED;
- }
-
- Context *unregister_watch_ctx = nullptr;
- {
- RWLock::WLocker watch_locker(m_watch_lock);
- assert(m_watch_state == WATCH_STATE_REWATCHING);
- m_watch_state = next_watch_state;
-
- std::swap(unregister_watch_ctx, m_unregister_watch_ctx);
-
- m_work_queue->queue(
- create_context_callback<Watcher,
- &Watcher::handle_rewatch_complete>(this), r);
- }
-
- // wake up pending unregister request
- if (unregister_watch_ctx != nullptr) {
- unregister_watch_ctx->complete(0);
- }
-}
-
-void Watcher::send_notify(bufferlist& payload,
- watcher::NotifyResponse *response,
- Context *on_finish) {
- m_notifier.notify(payload, response, on_finish);
-}
-
-void Watcher::WatchCtx::handle_notify(uint64_t notify_id, uint64_t handle,
- uint64_t notifier_id, bufferlist& bl) {
- // if notifications are blocked, finish the notification w/o
- // bubbling the notification up to the derived class
- watcher.m_async_op_tracker.start_op();
- if (watcher.notifications_blocked()) {
- bufferlist bl;
- watcher.acknowledge_notify(notify_id, handle, bl);
- } else {
- watcher.handle_notify(notify_id, handle, notifier_id, bl);
- }
- watcher.m_async_op_tracker.finish_op();
-}
-
-void Watcher::WatchCtx::handle_error(uint64_t handle, int err) {
- watcher.handle_error(handle, err);
-}
-
-} // namespace librbd
Code Review / stor4nfv.git / blobdiff