--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/ImageWatcher.h"
+#include "librbd/ExclusiveLock.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/ImageState.h"
+#include "librbd/internal.h"
+#include "librbd/Operations.h"
+#include "librbd/TaskFinisher.h"
+#include "librbd/Utils.h"
+#include "librbd/exclusive_lock/Policy.h"
+#include "librbd/image_watcher/NotifyLockOwner.h"
+#include "librbd/io/AioCompletion.h"
+#include "librbd/watcher/Utils.h"
+#include "include/encoding.h"
+#include "common/errno.h"
+#include "common/WorkQueue.h"
+#include <boost/bind.hpp>
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::ImageWatcher: "
+
+namespace librbd {
+
+using namespace image_watcher;
+using namespace watch_notify;
+using util::create_async_context_callback;
+using util::create_context_callback;
+using util::create_rados_callback;
+using librbd::watcher::util::HandlePayloadVisitor;
+
+static const double RETRY_DELAY_SECONDS = 1.0;
+
+template <typename I>
+struct ImageWatcher<I>::C_ProcessPayload : public Context {
+ ImageWatcher *image_watcher;
+ uint64_t notify_id;
+ uint64_t handle;
+ watch_notify::Payload payload;
+
+ C_ProcessPayload(ImageWatcher *image_watcher_, uint64_t notify_id_,
+ uint64_t handle_, const watch_notify::Payload &payload)
+ : image_watcher(image_watcher_), notify_id(notify_id_), handle(handle_),
+ payload(payload) {
+ }
+
+ void finish(int r) override {
+ image_watcher->m_async_op_tracker.start_op();
+ if (image_watcher->notifications_blocked()) {
+ // requests are blocked -- just ack the notification
+ bufferlist bl;
+ image_watcher->acknowledge_notify(notify_id, handle, bl);
+ } else {
+ image_watcher->process_payload(notify_id, handle, payload);
+ }
+ image_watcher->m_async_op_tracker.finish_op();
+ }
+};
+
+template <typename I>
+ImageWatcher<I>::ImageWatcher(I &image_ctx)
+ : Watcher(image_ctx.md_ctx, image_ctx.op_work_queue, image_ctx.header_oid),
+ m_image_ctx(image_ctx),
+ m_task_finisher(new TaskFinisher<Task>(*m_image_ctx.cct)),
+ m_async_request_lock(util::unique_lock_name("librbd::ImageWatcher::m_async_request_lock", this)),
+ m_owner_client_id_lock(util::unique_lock_name("librbd::ImageWatcher::m_owner_client_id_lock", this))
+{
+}
+
+template <typename I>
+ImageWatcher<I>::~ImageWatcher()
+{
+ delete m_task_finisher;
+}
+
+template <typename I>
+void ImageWatcher<I>::unregister_watch(Context *on_finish) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << this << " unregistering image watcher" << dendl;
+
+ cancel_async_requests();
+
+ FunctionContext *ctx = new FunctionContext([this, on_finish](int r) {
+ m_task_finisher->cancel_all(on_finish);
+ });
+ Watcher::unregister_watch(ctx);
+}
+
+template <typename I>
+void ImageWatcher<I>::block_notifies(Context *on_finish) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << this << " " << __func__ << dendl;
+
+ on_finish = new FunctionContext([this, on_finish](int r) {
+ cancel_async_requests();
+ on_finish->complete(r);
+ });
+ Watcher::block_notifies(on_finish);
+}
+
+template <typename I>
+void ImageWatcher<I>::schedule_async_progress(const AsyncRequestId &request,
+ uint64_t offset, uint64_t total) {
+ FunctionContext *ctx = new FunctionContext(
+ boost::bind(&ImageWatcher<I>::notify_async_progress, this, request, offset,
+ total));
+ m_task_finisher->queue(Task(TASK_CODE_ASYNC_PROGRESS, request), ctx);
+}
+
+template <typename I>
+int ImageWatcher<I>::notify_async_progress(const AsyncRequestId &request,
+ uint64_t offset, uint64_t total) {
+ ldout(m_image_ctx.cct, 20) << this << " remote async request progress: "
+ << request << " @ " << offset
+ << "/" << total << dendl;
+
+ send_notify(AsyncProgressPayload(request, offset, total));
+ return 0;
+}
+
+template <typename I>
+void ImageWatcher<I>::schedule_async_complete(const AsyncRequestId &request,
+ int r) {
+ FunctionContext *ctx = new FunctionContext(
+ boost::bind(&ImageWatcher<I>::notify_async_complete, this, request, r));
+ m_task_finisher->queue(ctx);
+}
+
+template <typename I>
+void ImageWatcher<I>::notify_async_complete(const AsyncRequestId &request,
+ int r) {
+ ldout(m_image_ctx.cct, 20) << this << " remote async request finished: "
+ << request << " = " << r << dendl;
+
+ send_notify(AsyncCompletePayload(request, r),
+ new FunctionContext(boost::bind(&ImageWatcher<I>::handle_async_complete,
+ this, request, r, _1)));
+}
+
+template <typename I>
+void ImageWatcher<I>::handle_async_complete(const AsyncRequestId &request,
+ int r, int ret_val) {
+ ldout(m_image_ctx.cct, 20) << this << " " << __func__ << ": "
+ << "request=" << request << ", r=" << ret_val
+ << dendl;
+ if (ret_val < 0) {
+ lderr(m_image_ctx.cct) << this << " failed to notify async complete: "
+ << cpp_strerror(ret_val) << dendl;
+ if (ret_val == -ETIMEDOUT) {
+ schedule_async_complete(request, r);
+ }
+ } else {
+ RWLock::WLocker async_request_locker(m_async_request_lock);
+ m_async_pending.erase(request);
+ }
+}
+
+template <typename I>
+void ImageWatcher<I>::notify_flatten(uint64_t request_id,
+ ProgressContext &prog_ctx,
+ Context *on_finish) {
+ assert(m_image_ctx.owner_lock.is_locked());
+ assert(m_image_ctx.exclusive_lock &&
+ !m_image_ctx.exclusive_lock->is_lock_owner());
+
+ AsyncRequestId async_request_id(get_client_id(), request_id);
+
+ notify_async_request(async_request_id, FlattenPayload(async_request_id),
+ prog_ctx, on_finish);
+}
+
+template <typename I>
+void ImageWatcher<I>::notify_resize(uint64_t request_id, uint64_t size,
+ bool allow_shrink,
+ ProgressContext &prog_ctx,
+ Context *on_finish) {
+ assert(m_image_ctx.owner_lock.is_locked());
+ assert(m_image_ctx.exclusive_lock &&
+ !m_image_ctx.exclusive_lock->is_lock_owner());
+
+ AsyncRequestId async_request_id(get_client_id(), request_id);
+
+ notify_async_request(async_request_id,
+ ResizePayload(size, allow_shrink, async_request_id),
+ prog_ctx, on_finish);
+}
+
+template <typename I>
+void ImageWatcher<I>::notify_snap_create(const cls::rbd::SnapshotNamespace &snap_namespace,
+ const std::string &snap_name,
+ Context *on_finish) {
+ assert(m_image_ctx.owner_lock.is_locked());
+ assert(m_image_ctx.exclusive_lock &&
+ !m_image_ctx.exclusive_lock->is_lock_owner());
+
+ notify_lock_owner(SnapCreatePayload(snap_namespace, snap_name), on_finish);
+}
+
+template <typename I>
+void ImageWatcher<I>::notify_snap_rename(const snapid_t &src_snap_id,
+ const std::string &dst_snap_name,
+ Context *on_finish) {
+ assert(m_image_ctx.owner_lock.is_locked());
+ assert(m_image_ctx.exclusive_lock &&
+ !m_image_ctx.exclusive_lock->is_lock_owner());
+
+ notify_lock_owner(SnapRenamePayload(src_snap_id, dst_snap_name), on_finish);
+}
+
+template <typename I>
+void ImageWatcher<I>::notify_snap_remove(const cls::rbd::SnapshotNamespace &snap_namespace,
+ const std::string &snap_name,
+ Context *on_finish) {
+ assert(m_image_ctx.owner_lock.is_locked());
+ assert(m_image_ctx.exclusive_lock &&
+ !m_image_ctx.exclusive_lock->is_lock_owner());
+
+ notify_lock_owner(SnapRemovePayload(snap_namespace, snap_name), on_finish);
+}
+
+template <typename I>
+void ImageWatcher<I>::notify_snap_protect(const cls::rbd::SnapshotNamespace &snap_namespace,
+ const std::string &snap_name,
+ Context *on_finish) {
+ assert(m_image_ctx.owner_lock.is_locked());
+ assert(m_image_ctx.exclusive_lock &&
+ !m_image_ctx.exclusive_lock->is_lock_owner());
+
+ notify_lock_owner(SnapProtectPayload(snap_namespace, snap_name), on_finish);
+}
+
+template <typename I>
+void ImageWatcher<I>::notify_snap_unprotect(const cls::rbd::SnapshotNamespace &snap_namespace,
+ const std::string &snap_name,
+ Context *on_finish) {
+ assert(m_image_ctx.owner_lock.is_locked());
+ assert(m_image_ctx.exclusive_lock &&
+ !m_image_ctx.exclusive_lock->is_lock_owner());
+
+ notify_lock_owner(SnapUnprotectPayload(snap_namespace, snap_name), on_finish);
+}
+
+template <typename I>
+void ImageWatcher<I>::notify_rebuild_object_map(uint64_t request_id,
+ ProgressContext &prog_ctx,
+ Context *on_finish) {
+ assert(m_image_ctx.owner_lock.is_locked());
+ assert(m_image_ctx.exclusive_lock &&
+ !m_image_ctx.exclusive_lock->is_lock_owner());
+
+ AsyncRequestId async_request_id(get_client_id(), request_id);
+
+ notify_async_request(async_request_id,
+ RebuildObjectMapPayload(async_request_id),
+ prog_ctx, on_finish);
+}
+
+template <typename I>
+void ImageWatcher<I>::notify_rename(const std::string &image_name,
+ Context *on_finish) {
+ assert(m_image_ctx.owner_lock.is_locked());
+ assert(m_image_ctx.exclusive_lock &&
+ !m_image_ctx.exclusive_lock->is_lock_owner());
+
+ notify_lock_owner(RenamePayload(image_name), on_finish);
+}
+
+template <typename I>
+void ImageWatcher<I>::notify_update_features(uint64_t features, bool enabled,
+ Context *on_finish) {
+ assert(m_image_ctx.owner_lock.is_locked());
+ assert(m_image_ctx.exclusive_lock &&
+ !m_image_ctx.exclusive_lock->is_lock_owner());
+
+ notify_lock_owner(UpdateFeaturesPayload(features, enabled), on_finish);
+}
+
+template <typename I>
+void ImageWatcher<I>::notify_header_update(Context *on_finish) {
+ ldout(m_image_ctx.cct, 10) << this << ": " << __func__ << dendl;
+
+ // supports legacy (empty buffer) clients
+ send_notify(HeaderUpdatePayload(), on_finish);
+}
+
+template <typename I>
+void ImageWatcher<I>::notify_header_update(librados::IoCtx &io_ctx,
+ const std::string &oid) {
+ // supports legacy (empty buffer) clients
+ bufferlist bl;
+ ::encode(NotifyMessage(HeaderUpdatePayload()), bl);
+ io_ctx.notify2(oid, bl, watcher::Notifier::NOTIFY_TIMEOUT, nullptr);
+}
+
+template <typename I>
+void ImageWatcher<I>::schedule_cancel_async_requests() {
+ FunctionContext *ctx = new FunctionContext(
+ boost::bind(&ImageWatcher<I>::cancel_async_requests, this));
+ m_task_finisher->queue(TASK_CODE_CANCEL_ASYNC_REQUESTS, ctx);
+}
+
+template <typename I>
+void ImageWatcher<I>::cancel_async_requests() {
+ RWLock::WLocker l(m_async_request_lock);
+ for (std::map<AsyncRequestId, AsyncRequest>::iterator iter =
+ m_async_requests.begin();
+ iter != m_async_requests.end(); ++iter) {
+ iter->second.first->complete(-ERESTART);
+ }
+ m_async_requests.clear();
+}
+
+template <typename I>
+void ImageWatcher<I>::set_owner_client_id(const ClientId& client_id) {
+ assert(m_owner_client_id_lock.is_locked());
+ m_owner_client_id = client_id;
+ ldout(m_image_ctx.cct, 10) << this << " current lock owner: "
+ << m_owner_client_id << dendl;
+}
+
+template <typename I>
+ClientId ImageWatcher<I>::get_client_id() {
+ RWLock::RLocker l(this->m_watch_lock);
+ return ClientId(m_image_ctx.md_ctx.get_instance_id(), this->m_watch_handle);
+}
+
+template <typename I>
+void ImageWatcher<I>::notify_acquired_lock() {
+ ldout(m_image_ctx.cct, 10) << this << " notify acquired lock" << dendl;
+
+ ClientId client_id = get_client_id();
+ {
+ Mutex::Locker owner_client_id_locker(m_owner_client_id_lock);
+ set_owner_client_id(client_id);
+ }
+
+ send_notify(AcquiredLockPayload(client_id));
+}
+
+template <typename I>
+void ImageWatcher<I>::notify_released_lock() {
+ ldout(m_image_ctx.cct, 10) << this << " notify released lock" << dendl;
+
+ {
+ Mutex::Locker owner_client_id_locker(m_owner_client_id_lock);
+ set_owner_client_id(ClientId());
+ }
+
+ send_notify(ReleasedLockPayload(get_client_id()));
+}
+
+template <typename I>
+void ImageWatcher<I>::schedule_request_lock(bool use_timer, int timer_delay) {
+ assert(m_image_ctx.owner_lock.is_locked());
+
+ if (m_image_ctx.exclusive_lock == nullptr) {
+ // exclusive lock dynamically disabled via image refresh
+ return;
+ }
+ assert(m_image_ctx.exclusive_lock &&
+ !m_image_ctx.exclusive_lock->is_lock_owner());
+
+ RWLock::RLocker watch_locker(this->m_watch_lock);
+ if (this->m_watch_state == Watcher::WATCH_STATE_REGISTERED) {
+ ldout(m_image_ctx.cct, 15) << this << " requesting exclusive lock" << dendl;
+
+ FunctionContext *ctx = new FunctionContext(
+ boost::bind(&ImageWatcher<I>::notify_request_lock, this));
+ if (use_timer) {
+ if (timer_delay < 0) {
+ timer_delay = RETRY_DELAY_SECONDS;
+ }
+ m_task_finisher->add_event_after(TASK_CODE_REQUEST_LOCK,
+ timer_delay, ctx);
+ } else {
+ m_task_finisher->queue(TASK_CODE_REQUEST_LOCK, ctx);
+ }
+ }
+}
+
+template <typename I>
+void ImageWatcher<I>::notify_request_lock() {
+ RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
+ RWLock::RLocker snap_locker(m_image_ctx.snap_lock);
+
+ // ExclusiveLock state machine can be dynamically disabled or
+ // race with task cancel
+ if (m_image_ctx.exclusive_lock == nullptr ||
+ m_image_ctx.exclusive_lock->is_lock_owner()) {
+ return;
+ }
+
+ ldout(m_image_ctx.cct, 10) << this << " notify request lock" << dendl;
+
+ notify_lock_owner(RequestLockPayload(get_client_id(), false),
+ create_context_callback<
+ ImageWatcher, &ImageWatcher<I>::handle_request_lock>(this));
+}
+
+template <typename I>
+void ImageWatcher<I>::handle_request_lock(int r) {
+ RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
+ RWLock::RLocker snap_locker(m_image_ctx.snap_lock);
+
+ // ExclusiveLock state machine cannot transition -- but can be
+ // dynamically disabled
+ if (m_image_ctx.exclusive_lock == nullptr) {
+ return;
+ }
+
+ if (r == -ETIMEDOUT) {
+ ldout(m_image_ctx.cct, 5) << this << " timed out requesting lock: retrying"
+ << dendl;
+
+ // treat this is a dead client -- so retest acquiring the lock
+ m_image_ctx.exclusive_lock->handle_peer_notification(0);
+ } else if (r == -EROFS) {
+ ldout(m_image_ctx.cct, 5) << this << " peer will not release lock" << dendl;
+ m_image_ctx.exclusive_lock->handle_peer_notification(r);
+ } else if (r < 0) {
+ lderr(m_image_ctx.cct) << this << " error requesting lock: "
+ << cpp_strerror(r) << dendl;
+ schedule_request_lock(true);
+ } else {
+ // lock owner acked -- but resend if we don't see them release the lock
+ int retry_timeout = m_image_ctx.cct->_conf->template get_val<int64_t>(
+ "client_notify_timeout");
+ ldout(m_image_ctx.cct, 15) << this << " will retry in " << retry_timeout
+ << " seconds" << dendl;
+ schedule_request_lock(true, retry_timeout);
+ }
+}
+
+template <typename I>
+void ImageWatcher<I>::notify_lock_owner(const Payload& payload,
+ Context *on_finish) {
+ assert(on_finish != nullptr);
+ assert(m_image_ctx.owner_lock.is_locked());
+
+ bufferlist bl;
+ ::encode(NotifyMessage(payload), bl);
+
+ NotifyLockOwner *notify_lock_owner = NotifyLockOwner::create(
+ m_image_ctx, this->m_notifier, std::move(bl), on_finish);
+ notify_lock_owner->send();
+}
+
+template <typename I>
+Context *ImageWatcher<I>::remove_async_request(const AsyncRequestId &id) {
+ RWLock::WLocker async_request_locker(m_async_request_lock);
+ auto it = m_async_requests.find(id);
+ if (it != m_async_requests.end()) {
+ Context *on_complete = it->second.first;
+ m_async_requests.erase(it);
+ return on_complete;
+ }
+ return nullptr;
+}
+
+template <typename I>
+void ImageWatcher<I>::schedule_async_request_timed_out(const AsyncRequestId &id) {
+ ldout(m_image_ctx.cct, 20) << "scheduling async request time out: " << id
+ << dendl;
+
+ Context *ctx = new FunctionContext(boost::bind(
+ &ImageWatcher<I>::async_request_timed_out, this, id));
+
+ Task task(TASK_CODE_ASYNC_REQUEST, id);
+ m_task_finisher->cancel(task);
+
+ m_task_finisher->add_event_after(task, m_image_ctx.request_timed_out_seconds,
+ ctx);
+}
+
+template <typename I>
+void ImageWatcher<I>::async_request_timed_out(const AsyncRequestId &id) {
+ Context *on_complete = remove_async_request(id);
+ if (on_complete != nullptr) {
+ ldout(m_image_ctx.cct, 5) << "async request timed out: " << id << dendl;
+ m_image_ctx.op_work_queue->queue(on_complete, -ETIMEDOUT);
+ }
+}
+
+template <typename I>
+void ImageWatcher<I>::notify_async_request(const AsyncRequestId &async_request_id,
+ const Payload& payload,
+ ProgressContext& prog_ctx,
+ Context *on_finish) {
+ assert(on_finish != nullptr);
+ assert(m_image_ctx.owner_lock.is_locked());
+
+ ldout(m_image_ctx.cct, 10) << this << " async request: " << async_request_id
+ << dendl;
+
+ Context *on_notify = new FunctionContext([this, async_request_id](int r) {
+ if (r < 0) {
+ // notification failed -- don't expect updates
+ Context *on_complete = remove_async_request(async_request_id);
+ if (on_complete != nullptr) {
+ on_complete->complete(r);
+ }
+ }
+ });
+
+ Context *on_complete = new FunctionContext(
+ [this, async_request_id, on_finish](int r) {
+ m_task_finisher->cancel(Task(TASK_CODE_ASYNC_REQUEST, async_request_id));
+ on_finish->complete(r);
+ });
+
+ {
+ RWLock::WLocker async_request_locker(m_async_request_lock);
+ m_async_requests[async_request_id] = AsyncRequest(on_complete, &prog_ctx);
+ }
+
+ schedule_async_request_timed_out(async_request_id);
+ notify_lock_owner(payload, on_notify);
+}
+
+template <typename I>
+int ImageWatcher<I>::prepare_async_request(const AsyncRequestId& async_request_id,
+ bool* new_request, Context** ctx,
+ ProgressContext** prog_ctx) {
+ if (async_request_id.client_id == get_client_id()) {
+ return -ERESTART;
+ } else {
+ RWLock::WLocker l(m_async_request_lock);
+ if (m_async_pending.count(async_request_id) == 0) {
+ m_async_pending.insert(async_request_id);
+ *new_request = true;
+ *prog_ctx = new RemoteProgressContext(*this, async_request_id);
+ *ctx = new RemoteContext(*this, async_request_id, *prog_ctx);
+ } else {
+ *new_request = false;
+ }
+ }
+ return 0;
+}
+
+template <typename I>
+bool ImageWatcher<I>::handle_payload(const HeaderUpdatePayload &payload,
+ C_NotifyAck *ack_ctx) {
+ ldout(m_image_ctx.cct, 10) << this << " image header updated" << dendl;
+
+ m_image_ctx.state->handle_update_notification();
+ m_image_ctx.perfcounter->inc(l_librbd_notify);
+ if (ack_ctx != nullptr) {
+ m_image_ctx.state->flush_update_watchers(new C_ResponseMessage(ack_ctx));
+ return false;
+ }
+ return true;
+}
+
+template <typename I>
+bool ImageWatcher<I>::handle_payload(const AcquiredLockPayload &payload,
+ C_NotifyAck *ack_ctx) {
+ ldout(m_image_ctx.cct, 10) << this << " image exclusively locked announcement"
+ << dendl;
+
+ bool cancel_async_requests = true;
+ if (payload.client_id.is_valid()) {
+ Mutex::Locker owner_client_id_locker(m_owner_client_id_lock);
+ if (payload.client_id == m_owner_client_id) {
+ cancel_async_requests = false;
+ }
+ set_owner_client_id(payload.client_id);
+ }
+
+ RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
+ if (m_image_ctx.exclusive_lock != nullptr) {
+ // potentially wake up the exclusive lock state machine now that
+ // a lock owner has advertised itself
+ m_image_ctx.exclusive_lock->handle_peer_notification(0);
+ }
+ if (cancel_async_requests &&
+ (m_image_ctx.exclusive_lock == nullptr ||
+ !m_image_ctx.exclusive_lock->is_lock_owner())) {
+ schedule_cancel_async_requests();
+ }
+ return true;
+}
+
+template <typename I>
+bool ImageWatcher<I>::handle_payload(const ReleasedLockPayload &payload,
+ C_NotifyAck *ack_ctx) {
+ ldout(m_image_ctx.cct, 10) << this << " exclusive lock released" << dendl;
+
+ bool cancel_async_requests = true;
+ if (payload.client_id.is_valid()) {
+ Mutex::Locker l(m_owner_client_id_lock);
+ if (payload.client_id != m_owner_client_id) {
+ ldout(m_image_ctx.cct, 10) << this << " unexpected owner: "
+ << payload.client_id << " != "
+ << m_owner_client_id << dendl;
+ cancel_async_requests = false;
+ } else {
+ set_owner_client_id(ClientId());
+ }
+ }
+
+ RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
+ if (cancel_async_requests &&
+ (m_image_ctx.exclusive_lock == nullptr ||
+ !m_image_ctx.exclusive_lock->is_lock_owner())) {
+ schedule_cancel_async_requests();
+ }
+
+ // alert the exclusive lock state machine that the lock is available
+ if (m_image_ctx.exclusive_lock != nullptr &&
+ !m_image_ctx.exclusive_lock->is_lock_owner()) {
+ m_task_finisher->cancel(TASK_CODE_REQUEST_LOCK);
+ m_image_ctx.exclusive_lock->handle_peer_notification(0);
+ }
+ return true;
+}
+
+template <typename I>
+bool ImageWatcher<I>::handle_payload(const RequestLockPayload &payload,
+ C_NotifyAck *ack_ctx) {
+ ldout(m_image_ctx.cct, 10) << this << " exclusive lock requested" << dendl;
+ if (payload.client_id == get_client_id()) {
+ return true;
+ }
+
+ RWLock::RLocker l(m_image_ctx.owner_lock);
+ if (m_image_ctx.exclusive_lock != nullptr &&
+ m_image_ctx.exclusive_lock->is_lock_owner()) {
+ int r = 0;
+ bool accept_request = m_image_ctx.exclusive_lock->accept_requests(&r);
+
+ if (accept_request) {
+ assert(r == 0);
+ Mutex::Locker owner_client_id_locker(m_owner_client_id_lock);
+ if (!m_owner_client_id.is_valid()) {
+ return true;
+ }
+
+ ldout(m_image_ctx.cct, 10) << this << " queuing release of exclusive lock"
+ << dendl;
+ r = m_image_ctx.get_exclusive_lock_policy()->lock_requested(
+ payload.force);
+ }
+ ::encode(ResponseMessage(r), ack_ctx->out);
+ }
+ return true;
+}
+
+template <typename I>
+bool ImageWatcher<I>::handle_payload(const AsyncProgressPayload &payload,
+ C_NotifyAck *ack_ctx) {
+ RWLock::RLocker l(m_async_request_lock);
+ std::map<AsyncRequestId, AsyncRequest>::iterator req_it =
+ m_async_requests.find(payload.async_request_id);
+ if (req_it != m_async_requests.end()) {
+ ldout(m_image_ctx.cct, 20) << this << " request progress: "
+ << payload.async_request_id << " @ "
+ << payload.offset << "/" << payload.total
+ << dendl;
+ schedule_async_request_timed_out(payload.async_request_id);
+ req_it->second.second->update_progress(payload.offset, payload.total);
+ }
+ return true;
+}
+
+template <typename I>
+bool ImageWatcher<I>::handle_payload(const AsyncCompletePayload &payload,
+ C_NotifyAck *ack_ctx) {
+ Context *on_complete = remove_async_request(payload.async_request_id);
+ if (on_complete != nullptr) {
+ ldout(m_image_ctx.cct, 10) << this << " request finished: "
+ << payload.async_request_id << "="
+ << payload.result << dendl;
+ on_complete->complete(payload.result);
+ }
+ return true;
+}
+
+template <typename I>
+bool ImageWatcher<I>::handle_payload(const FlattenPayload &payload,
+ C_NotifyAck *ack_ctx) {
+
+ RWLock::RLocker l(m_image_ctx.owner_lock);
+ if (m_image_ctx.exclusive_lock != nullptr) {
+ int r;
+ if (m_image_ctx.exclusive_lock->accept_requests(&r)) {
+ bool new_request;
+ Context *ctx;
+ ProgressContext *prog_ctx;
+ r = prepare_async_request(payload.async_request_id, &new_request,
+ &ctx, &prog_ctx);
+ if (r == 0 && new_request) {
+ ldout(m_image_ctx.cct, 10) << this << " remote flatten request: "
+ << payload.async_request_id << dendl;
+ m_image_ctx.operations->execute_flatten(*prog_ctx, ctx);
+ }
+
+ ::encode(ResponseMessage(r), ack_ctx->out);
+ } else if (r < 0) {
+ ::encode(ResponseMessage(r), ack_ctx->out);
+ }
+ }
+ return true;
+}
+
+template <typename I>
+bool ImageWatcher<I>::handle_payload(const ResizePayload &payload,
+ C_NotifyAck *ack_ctx) {
+ RWLock::RLocker l(m_image_ctx.owner_lock);
+ if (m_image_ctx.exclusive_lock != nullptr) {
+ int r;
+ if (m_image_ctx.exclusive_lock->accept_requests(&r)) {
+ bool new_request;
+ Context *ctx;
+ ProgressContext *prog_ctx;
+ r = prepare_async_request(payload.async_request_id, &new_request,
+ &ctx, &prog_ctx);
+ if (r == 0 && new_request) {
+ ldout(m_image_ctx.cct, 10) << this << " remote resize request: "
+ << payload.async_request_id << " "
+ << payload.size << " "
+ << payload.allow_shrink << dendl;
+ m_image_ctx.operations->execute_resize(payload.size, payload.allow_shrink, *prog_ctx, ctx, 0);
+ }
+
+ ::encode(ResponseMessage(r), ack_ctx->out);
+ } else if (r < 0) {
+ ::encode(ResponseMessage(r), ack_ctx->out);
+ }
+ }
+ return true;
+}
+
+template <typename I>
+bool ImageWatcher<I>::handle_payload(const SnapCreatePayload &payload,
+ C_NotifyAck *ack_ctx) {
+ RWLock::RLocker l(m_image_ctx.owner_lock);
+ if (m_image_ctx.exclusive_lock != nullptr) {
+ int r;
+ if (m_image_ctx.exclusive_lock->accept_requests(&r)) {
+ ldout(m_image_ctx.cct, 10) << this << " remote snap_create request: "
+ << payload.snap_name << dendl;
+
+ m_image_ctx.operations->execute_snap_create(payload.snap_namespace,
+ payload.snap_name,
+ new C_ResponseMessage(ack_ctx),
+ 0, false);
+ return false;
+ } else if (r < 0) {
+ ::encode(ResponseMessage(r), ack_ctx->out);
+ }
+ }
+ return true;
+}
+
+template <typename I>
+bool ImageWatcher<I>::handle_payload(const SnapRenamePayload &payload,
+ C_NotifyAck *ack_ctx) {
+ RWLock::RLocker l(m_image_ctx.owner_lock);
+ if (m_image_ctx.exclusive_lock != nullptr) {
+ int r;
+ if (m_image_ctx.exclusive_lock->accept_requests(&r)) {
+ ldout(m_image_ctx.cct, 10) << this << " remote snap_rename request: "
+ << payload.snap_id << " to "
+ << payload.snap_name << dendl;
+
+ m_image_ctx.operations->execute_snap_rename(payload.snap_id,
+ payload.snap_name,
+ new C_ResponseMessage(ack_ctx));
+ return false;
+ } else if (r < 0) {
+ ::encode(ResponseMessage(r), ack_ctx->out);
+ }
+ }
+ return true;
+}
+
+template <typename I>
+bool ImageWatcher<I>::handle_payload(const SnapRemovePayload &payload,
+ C_NotifyAck *ack_ctx) {
+ RWLock::RLocker l(m_image_ctx.owner_lock);
+ if (m_image_ctx.exclusive_lock != nullptr) {
+ int r;
+ if (m_image_ctx.exclusive_lock->accept_requests(&r)) {
+ ldout(m_image_ctx.cct, 10) << this << " remote snap_remove request: "
+ << payload.snap_name << dendl;
+
+ m_image_ctx.operations->execute_snap_remove(payload.snap_namespace,
+ payload.snap_name,
+ new C_ResponseMessage(ack_ctx));
+ return false;
+ } else if (r < 0) {
+ ::encode(ResponseMessage(r), ack_ctx->out);
+ }
+ }
+ return true;
+}
+
+template <typename I>
+bool ImageWatcher<I>::handle_payload(const SnapProtectPayload& payload,
+ C_NotifyAck *ack_ctx) {
+ RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
+ if (m_image_ctx.exclusive_lock != nullptr) {
+ int r;
+ if (m_image_ctx.exclusive_lock->accept_requests(&r)) {
+ ldout(m_image_ctx.cct, 10) << this << " remote snap_protect request: "
+ << payload.snap_name << dendl;
+
+ m_image_ctx.operations->execute_snap_protect(payload.snap_namespace,
+ payload.snap_name,
+ new C_ResponseMessage(ack_ctx));
+ return false;
+ } else if (r < 0) {
+ ::encode(ResponseMessage(r), ack_ctx->out);
+ }
+ }
+ return true;
+}
+
+template <typename I>
+bool ImageWatcher<I>::handle_payload(const SnapUnprotectPayload& payload,
+ C_NotifyAck *ack_ctx) {
+ RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
+ if (m_image_ctx.exclusive_lock != nullptr) {
+ int r;
+ if (m_image_ctx.exclusive_lock->accept_requests(&r)) {
+ ldout(m_image_ctx.cct, 10) << this << " remote snap_unprotect request: "
+ << payload.snap_name << dendl;
+
+ m_image_ctx.operations->execute_snap_unprotect(payload.snap_namespace,
+ payload.snap_name,
+ new C_ResponseMessage(ack_ctx));
+ return false;
+ } else if (r < 0) {
+ ::encode(ResponseMessage(r), ack_ctx->out);
+ }
+ }
+ return true;
+}
+
+template <typename I>
+bool ImageWatcher<I>::handle_payload(const RebuildObjectMapPayload& payload,
+ C_NotifyAck *ack_ctx) {
+ RWLock::RLocker l(m_image_ctx.owner_lock);
+ if (m_image_ctx.exclusive_lock != nullptr) {
+ int r;
+ if (m_image_ctx.exclusive_lock->accept_requests(&r)) {
+ bool new_request;
+ Context *ctx;
+ ProgressContext *prog_ctx;
+ r = prepare_async_request(payload.async_request_id, &new_request,
+ &ctx, &prog_ctx);
+ if (r == 0 && new_request) {
+ ldout(m_image_ctx.cct, 10) << this
+ << " remote rebuild object map request: "
+ << payload.async_request_id << dendl;
+ m_image_ctx.operations->execute_rebuild_object_map(*prog_ctx, ctx);
+ }
+
+ ::encode(ResponseMessage(r), ack_ctx->out);
+ } else if (r < 0) {
+ ::encode(ResponseMessage(r), ack_ctx->out);
+ }
+ }
+ return true;
+}
+
+template <typename I>
+bool ImageWatcher<I>::handle_payload(const RenamePayload& payload,
+ C_NotifyAck *ack_ctx) {
+ RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
+ if (m_image_ctx.exclusive_lock != nullptr) {
+ int r;
+ if (m_image_ctx.exclusive_lock->accept_requests(&r)) {
+ ldout(m_image_ctx.cct, 10) << this << " remote rename request: "
+ << payload.image_name << dendl;
+
+ m_image_ctx.operations->execute_rename(payload.image_name,
+ new C_ResponseMessage(ack_ctx));
+ return false;
+ } else if (r < 0) {
+ ::encode(ResponseMessage(r), ack_ctx->out);
+ }
+ }
+ return true;
+}
+
+template <typename I>
+bool ImageWatcher<I>::handle_payload(const UpdateFeaturesPayload& payload,
+ C_NotifyAck *ack_ctx) {
+ RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
+ if (m_image_ctx.exclusive_lock != nullptr) {
+ int r;
+ if (m_image_ctx.exclusive_lock->accept_requests(&r)) {
+ ldout(m_image_ctx.cct, 10) << this << " remote update_features request: "
+ << payload.features << " "
+ << (payload.enabled ? "enabled" : "disabled")
+ << dendl;
+
+ m_image_ctx.operations->execute_update_features(
+ payload.features, payload.enabled, new C_ResponseMessage(ack_ctx), 0);
+ return false;
+ } else if (r < 0) {
+ ::encode(ResponseMessage(r), ack_ctx->out);
+ }
+ }
+ return true;
+}
+
+template <typename I>
+bool ImageWatcher<I>::handle_payload(const UnknownPayload &payload,
+ C_NotifyAck *ack_ctx) {
+ RWLock::RLocker l(m_image_ctx.owner_lock);
+ if (m_image_ctx.exclusive_lock != nullptr) {
+ int r;
+ if (m_image_ctx.exclusive_lock->accept_requests(&r) || r < 0) {
+ ::encode(ResponseMessage(-EOPNOTSUPP), ack_ctx->out);
+ }
+ }
+ return true;
+}
+
+template <typename I>
+void ImageWatcher<I>::process_payload(uint64_t notify_id, uint64_t handle,
+ const Payload &payload) {
+ apply_visitor(HandlePayloadVisitor<ImageWatcher<I>>(this, notify_id, handle),
+ payload);
+}
+
+template <typename I>
+void ImageWatcher<I>::handle_notify(uint64_t notify_id, uint64_t handle,
+ uint64_t notifier_id, bufferlist &bl) {
+ NotifyMessage notify_message;
+ if (bl.length() == 0) {
+ // legacy notification for header updates
+ notify_message = NotifyMessage(HeaderUpdatePayload());
+ } else {
+ try {
+ bufferlist::iterator iter = bl.begin();
+ ::decode(notify_message, iter);
+ } catch (const buffer::error &err) {
+ lderr(m_image_ctx.cct) << this << " error decoding image notification: "
+ << err.what() << dendl;
+ return;
+ }
+ }
+
+ // if an image refresh is required, refresh before processing the request
+ if (notify_message.check_for_refresh() &&
+ m_image_ctx.state->is_refresh_required()) {
+ m_image_ctx.state->refresh(new C_ProcessPayload(this, notify_id, handle,
+ notify_message.payload));
+ } else {
+ process_payload(notify_id, handle, notify_message.payload);
+ }
+}
+
+template <typename I>
+void ImageWatcher<I>::handle_error(uint64_t handle, int err) {
+ lderr(m_image_ctx.cct) << this << " image watch failed: " << handle << ", "
+ << cpp_strerror(err) << dendl;
+
+ {
+ Mutex::Locker l(m_owner_client_id_lock);
+ set_owner_client_id(ClientId());
+ }
+
+ Watcher::handle_error(handle, err);
+}
+
+template <typename I>
+void ImageWatcher<I>::handle_rewatch_complete(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << this << " " << __func__ << ": r=" << r << dendl;
+
+ {
+ RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
+ if (m_image_ctx.exclusive_lock != nullptr) {
+ // update the lock cookie with the new watch handle
+ m_image_ctx.exclusive_lock->reacquire_lock();
+ }
+ }
+
+ // image might have been updated while we didn't have active watch
+ handle_payload(HeaderUpdatePayload(), nullptr);
+}
+
+template <typename I>
+void ImageWatcher<I>::send_notify(const Payload &payload, Context *ctx) {
+ bufferlist bl;
+
+ ::encode(NotifyMessage(payload), bl);
+ Watcher::send_notify(bl, nullptr, ctx);
+}
+
+template <typename I>
+void ImageWatcher<I>::RemoteContext::finish(int r) {
+ m_image_watcher.schedule_async_complete(m_async_request_id, r);
+}
+
+template <typename I>
+void ImageWatcher<I>::C_ResponseMessage::finish(int r) {
+ CephContext *cct = notify_ack->cct;
+ ldout(cct, 10) << this << " C_ResponseMessage: r=" << r << dendl;
+
+ ::encode(ResponseMessage(r), notify_ack->out);
+ notify_ack->complete(0);
+}
+
+} // namespace librbd
+
+template class librbd::ImageWatcher<librbd::ImageCtx>;
Code Review / stor4nfv.git / blobdiff