+++ /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