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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "librbd/mirror/DemoteRequest.h"
#include "common/dout.h"
#include "common/errno.h"
#include "cls/rbd/cls_rbd_client.h"
#include "librbd/ExclusiveLock.h"
#include "librbd/ImageCtx.h"
#include "librbd/ImageState.h"
#include "librbd/Journal.h"
#include "librbd/Utils.h"
#include "librbd/mirror/GetInfoRequest.h"
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::mirror::DemoteRequest: " << this \
<< " " << __func__ << ": "
namespace librbd {
namespace mirror {
using librbd::util::create_context_callback;
template <typename I>
void DemoteRequest<I>::send() {
get_info();
}
template <typename I>
void DemoteRequest<I>::get_info() {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 20) << dendl;
auto ctx = create_context_callback<
DemoteRequest<I>, &DemoteRequest<I>::handle_get_info>(this);
auto req = GetInfoRequest<I>::create(m_image_ctx, &m_mirror_image,
&m_promotion_state, ctx);
req->send();
}
template <typename I>
void DemoteRequest<I>::handle_get_info(int r) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 20) << "r=" << r << dendl;
if (r < 0) {
lderr(cct) << "failed to retrieve mirroring state: " << cpp_strerror(r)
<< dendl;
finish(r);
return;
} else if (m_mirror_image.state != cls::rbd::MIRROR_IMAGE_STATE_ENABLED) {
lderr(cct) << "mirroring is not currently enabled" << dendl;
finish(-EINVAL);
return;
} else if (m_promotion_state != PROMOTION_STATE_PRIMARY) {
lderr(cct) << "image is not primary" << dendl;
finish(-EINVAL);
return;
}
acquire_lock();
}
template <typename I>
void DemoteRequest<I>::acquire_lock() {
CephContext *cct = m_image_ctx.cct;
m_image_ctx.owner_lock.get_read();
if (m_image_ctx.exclusive_lock == nullptr) {
m_image_ctx.owner_lock.put_read();
lderr(cct) << "exclusive lock is not active" << dendl;
finish(-EINVAL);
return;
}
// avoid accepting new requests from peers while we demote
// the image
m_image_ctx.exclusive_lock->block_requests(0);
m_blocked_requests = true;
if (m_image_ctx.exclusive_lock->is_lock_owner()) {
m_image_ctx.owner_lock.put_read();
demote();
return;
}
ldout(cct, 20) << dendl;
auto ctx = create_context_callback<
DemoteRequest<I>, &DemoteRequest<I>::handle_acquire_lock>(this);
m_image_ctx.exclusive_lock->acquire_lock(ctx);
m_image_ctx.owner_lock.put_read();
}
template <typename I>
void DemoteRequest<I>::handle_acquire_lock(int r) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 20) << "r=" << r << dendl;
if (r < 0) {
lderr(cct) << "failed to lock image: " << cpp_strerror(r) << dendl;
finish(r);
return;
}
m_image_ctx.owner_lock.get_read();
if (m_image_ctx.exclusive_lock != nullptr &&
!m_image_ctx.exclusive_lock->is_lock_owner()) {
r = m_image_ctx.exclusive_lock->get_unlocked_op_error();
m_image_ctx.owner_lock.put_read();
lderr(cct) << "failed to acquire exclusive lock" << dendl;
finish(r);
return;
}
m_image_ctx.owner_lock.put_read();
demote();
}
template <typename I>
void DemoteRequest<I>::demote() {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 20) << dendl;
auto ctx = create_context_callback<
DemoteRequest<I>, &DemoteRequest<I>::handle_demote>(this);
Journal<I>::demote(&m_image_ctx, ctx);
}
template <typename I>
void DemoteRequest<I>::handle_demote(int r) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 20) << "r=" << r << dendl;
if (r < 0) {
m_ret_val = r;
lderr(cct) << "failed to demote image: " << cpp_strerror(r) << dendl;
}
release_lock();
}
template <typename I>
void DemoteRequest<I>::release_lock() {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 20) << dendl;
m_image_ctx.owner_lock.get_read();
if (m_image_ctx.exclusive_lock == nullptr) {
m_image_ctx.owner_lock.put_read();
finish(0);
return;
}
auto ctx = create_context_callback<
DemoteRequest<I>, &DemoteRequest<I>::handle_release_lock>(this);
m_image_ctx.exclusive_lock->release_lock(ctx);
m_image_ctx.owner_lock.put_read();
}
template <typename I>
void DemoteRequest<I>::handle_release_lock(int r) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 20) << "r=" << r << dendl;
if (r < 0) {
lderr(cct) << "failed to release exclusive lock: " << cpp_strerror(r)
<< dendl;
}
finish(r);
}
template <typename I>
void DemoteRequest<I>::finish(int r) {
if (m_ret_val < 0) {
r = m_ret_val;
}
{
RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
if (m_blocked_requests && m_image_ctx.exclusive_lock != nullptr) {
m_image_ctx.exclusive_lock->unblock_requests();
}
}
CephContext *cct = m_image_ctx.cct;
ldout(cct, 20) << "r=" << r << dendl;
m_on_finish->complete(r);
delete this;
}
} // namespace mirror
} // namespace librbd
template class librbd::mirror::DemoteRequest<librbd::ImageCtx>;
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