--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "include/compat.h"
+#include "CloseImageRequest.h"
+#include "IsPrimaryRequest.h"
+#include "OpenLocalImageRequest.h"
+#include "common/errno.h"
+#include "common/WorkQueue.h"
+#include "librbd/ExclusiveLock.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/ImageState.h"
+#include "librbd/Journal.h"
+#include "librbd/Utils.h"
+#include "librbd/exclusive_lock/Policy.h"
+#include "librbd/journal/Policy.h"
+#include <type_traits>
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_rbd_mirror
+#undef dout_prefix
+#define dout_prefix *_dout << "rbd::mirror::image_replayer::OpenLocalImageRequest: " \
+ << this << " " << __func__ << " "
+
+namespace rbd {
+namespace mirror {
+namespace image_replayer {
+
+using librbd::util::create_context_callback;
+
+namespace {
+
+template <typename I>
+struct MirrorExclusiveLockPolicy : public librbd::exclusive_lock::Policy {
+ I *image_ctx;
+
+ MirrorExclusiveLockPolicy(I *image_ctx) : image_ctx(image_ctx) {
+ }
+
+ bool may_auto_request_lock() override {
+ return false;
+ }
+
+ int lock_requested(bool force) override {
+ int r = -EROFS;
+ {
+ RWLock::RLocker owner_locker(image_ctx->owner_lock);
+ RWLock::RLocker snap_locker(image_ctx->snap_lock);
+ if (image_ctx->journal == nullptr || image_ctx->journal->is_tag_owner()) {
+ r = 0;
+ }
+ }
+
+ if (r == 0) {
+ // if the local image journal has been closed or if it was (force)
+ // promoted allow the lock to be released to another client
+ image_ctx->exclusive_lock->release_lock(nullptr);
+ }
+ return r;
+ }
+
+};
+
+struct MirrorJournalPolicy : public librbd::journal::Policy {
+ ContextWQ *work_queue;
+
+ MirrorJournalPolicy(ContextWQ *work_queue) : work_queue(work_queue) {
+ }
+
+ bool append_disabled() const override {
+ // avoid recording any events to the local journal
+ return true;
+ }
+ bool journal_disabled() const override {
+ return false;
+ }
+
+ void allocate_tag_on_lock(Context *on_finish) override {
+ // rbd-mirror will manually create tags by copying them from the peer
+ work_queue->queue(on_finish, 0);
+ }
+};
+
+} // anonymous namespace
+
+template <typename I>
+OpenLocalImageRequest<I>::OpenLocalImageRequest(librados::IoCtx &local_io_ctx,
+ I **local_image_ctx,
+ const std::string &local_image_id,
+ ContextWQ *work_queue,
+ Context *on_finish)
+ : m_local_io_ctx(local_io_ctx), m_local_image_ctx(local_image_ctx),
+ m_local_image_id(local_image_id), m_work_queue(work_queue),
+ m_on_finish(on_finish) {
+}
+
+template <typename I>
+void OpenLocalImageRequest<I>::send() {
+ send_open_image();
+}
+
+template <typename I>
+void OpenLocalImageRequest<I>::send_open_image() {
+ dout(20) << dendl;
+
+ *m_local_image_ctx = I::create("", m_local_image_id, nullptr,
+ m_local_io_ctx, false);
+ {
+ RWLock::WLocker owner_locker((*m_local_image_ctx)->owner_lock);
+ RWLock::WLocker snap_locker((*m_local_image_ctx)->snap_lock);
+ (*m_local_image_ctx)->set_exclusive_lock_policy(
+ new MirrorExclusiveLockPolicy<I>(*m_local_image_ctx));
+ (*m_local_image_ctx)->set_journal_policy(
+ new MirrorJournalPolicy(m_work_queue));
+ }
+
+ Context *ctx = create_context_callback<
+ OpenLocalImageRequest<I>, &OpenLocalImageRequest<I>::handle_open_image>(
+ this);
+ (*m_local_image_ctx)->state->open(false, ctx);
+}
+
+template <typename I>
+void OpenLocalImageRequest<I>::handle_open_image(int r) {
+ dout(20) << ": r=" << r << dendl;
+
+ if (r < 0) {
+ derr << ": failed to open image '" << m_local_image_id << "': "
+ << cpp_strerror(r) << dendl;
+ (*m_local_image_ctx)->destroy();
+ *m_local_image_ctx = nullptr;
+ finish(r);
+ return;
+ }
+
+ send_is_primary();
+}
+
+template <typename I>
+void OpenLocalImageRequest<I>::send_is_primary() {
+ dout(20) << dendl;
+
+ Context *ctx = create_context_callback<
+ OpenLocalImageRequest<I>, &OpenLocalImageRequest<I>::handle_is_primary>(
+ this);
+ IsPrimaryRequest<I> *request = IsPrimaryRequest<I>::create(*m_local_image_ctx,
+ &m_primary, ctx);
+ request->send();
+}
+
+template <typename I>
+void OpenLocalImageRequest<I>::handle_is_primary(int r) {
+ dout(20) << ": r=" << r << dendl;
+
+ if (r < 0) {
+ derr << ": error querying local image primary status: " << cpp_strerror(r)
+ << dendl;
+ send_close_image(r);
+ return;
+ }
+
+ // if the local image owns the tag -- don't steal the lock since
+ // we aren't going to mirror peer data into this image anyway
+ if (m_primary) {
+ dout(10) << ": local image is primary -- skipping image replay" << dendl;
+ send_close_image(-EREMOTEIO);
+ return;
+ }
+
+ send_lock_image();
+}
+
+template <typename I>
+void OpenLocalImageRequest<I>::send_lock_image() {
+ dout(20) << dendl;
+
+ RWLock::RLocker owner_locker((*m_local_image_ctx)->owner_lock);
+ if ((*m_local_image_ctx)->exclusive_lock == nullptr) {
+ derr << ": image does not support exclusive lock" << dendl;
+ send_close_image(-EINVAL);
+ return;
+ }
+
+ // disallow any proxied maintenance operations before grabbing lock
+ (*m_local_image_ctx)->exclusive_lock->block_requests(-EROFS);
+
+ Context *ctx = create_context_callback<
+ OpenLocalImageRequest<I>, &OpenLocalImageRequest<I>::handle_lock_image>(
+ this);
+
+ (*m_local_image_ctx)->exclusive_lock->acquire_lock(ctx);
+}
+
+template <typename I>
+void OpenLocalImageRequest<I>::handle_lock_image(int r) {
+ dout(20) << ": r=" << r << dendl;
+
+ if (r < 0) {
+ derr << ": failed to lock image '" << m_local_image_id << "': "
+ << cpp_strerror(r) << dendl;
+ send_close_image(r);
+ return;
+ }
+
+ {
+ RWLock::RLocker owner_locker((*m_local_image_ctx)->owner_lock);
+ if ((*m_local_image_ctx)->exclusive_lock == nullptr ||
+ !(*m_local_image_ctx)->exclusive_lock->is_lock_owner()) {
+ derr << ": image is not locked" << dendl;
+ send_close_image(-EBUSY);
+ return;
+ }
+ }
+
+ finish(0);
+}
+
+template <typename I>
+void OpenLocalImageRequest<I>::send_close_image(int r) {
+ dout(20) << dendl;
+
+ if (m_ret_val == 0 && r < 0) {
+ m_ret_val = r;
+ }
+
+ Context *ctx = create_context_callback<
+ OpenLocalImageRequest<I>, &OpenLocalImageRequest<I>::handle_close_image>(
+ this);
+ CloseImageRequest<I> *request = CloseImageRequest<I>::create(
+ m_local_image_ctx, ctx);
+ request->send();
+}
+
+template <typename I>
+void OpenLocalImageRequest<I>::handle_close_image(int r) {
+ dout(20) << dendl;
+
+ assert(r == 0);
+ finish(m_ret_val);
+}
+
+template <typename I>
+void OpenLocalImageRequest<I>::finish(int r) {
+ dout(20) << ": r=" << r << dendl;
+
+ m_on_finish->complete(r);
+ delete this;
+}
+
+} // namespace image_replayer
+} // namespace mirror
+} // namespace rbd
+
+template class rbd::mirror::image_replayer::OpenLocalImageRequest<librbd::ImageCtx>;
Code Review / stor4nfv.git / blobdiff