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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/EnableRequest.h"
#include "common/dout.h"
#include "common/errno.h"
#include "cls/rbd/cls_rbd_client.h"
#include "librbd/ImageState.h"
#include "librbd/Journal.h"
#include "librbd/MirroringWatcher.h"
#include "librbd/Utils.h"
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::mirror::EnableRequest: "
namespace librbd {
namespace mirror {
using util::create_context_callback;
using util::create_rados_callback;
template <typename I>
EnableRequest<I>::EnableRequest(librados::IoCtx &io_ctx,
const std::string &image_id,
const std::string &non_primary_global_image_id,
ContextWQ *op_work_queue, Context *on_finish)
: m_io_ctx(io_ctx), m_image_id(image_id),
m_non_primary_global_image_id(non_primary_global_image_id),
m_op_work_queue(op_work_queue), m_on_finish(on_finish),
m_cct(reinterpret_cast<CephContext*>(io_ctx.cct())) {
}
template <typename I>
void EnableRequest<I>::send() {
send_get_mirror_image();
}
template <typename I>
void EnableRequest<I>::send_get_mirror_image() {
ldout(m_cct, 10) << this << " " << __func__ << dendl;
librados::ObjectReadOperation op;
cls_client::mirror_image_get_start(&op, m_image_id);
using klass = EnableRequest<I>;
librados::AioCompletion *comp =
create_rados_callback<klass, &klass::handle_get_mirror_image>(this);
m_out_bl.clear();
int r = m_io_ctx.aio_operate(RBD_MIRRORING, comp, &op, &m_out_bl);
ceph_assert(r == 0);
comp->release();
}
template <typename I>
Context *EnableRequest<I>::handle_get_mirror_image(int *result) {
ldout(m_cct, 10) << this << " " << __func__ << ": r=" << *result << dendl;
if (*result == 0) {
auto iter = m_out_bl.cbegin();
*result = cls_client::mirror_image_get_finish(&iter, &m_mirror_image);
}
if (*result == 0) {
if (m_mirror_image.state == cls::rbd::MIRROR_IMAGE_STATE_ENABLED) {
ldout(m_cct, 10) << this << " " << __func__
<< ": mirroring is already enabled" << dendl;
} else {
lderr(m_cct) << "currently disabling" << dendl;
*result = -EINVAL;
}
return m_on_finish;
}
if (*result != -ENOENT) {
lderr(m_cct) << "failed to retrieve mirror image: " << cpp_strerror(*result)
<< dendl;
return m_on_finish;
}
*result = 0;
m_mirror_image.state = cls::rbd::MIRROR_IMAGE_STATE_ENABLED;
if (m_non_primary_global_image_id.empty()) {
uuid_d uuid_gen;
uuid_gen.generate_random();
m_mirror_image.global_image_id = uuid_gen.to_string();
} else {
m_mirror_image.global_image_id = m_non_primary_global_image_id;
}
send_get_tag_owner();
return nullptr;
}
template <typename I>
void EnableRequest<I>::send_get_tag_owner() {
if (!m_non_primary_global_image_id.empty()) {
send_set_mirror_image();
return;
}
ldout(m_cct, 10) << this << " " << __func__ << dendl;
using klass = EnableRequest<I>;
Context *ctx = create_context_callback<
klass, &klass::handle_get_tag_owner>(this);
librbd::Journal<>::is_tag_owner(m_io_ctx, m_image_id, &m_is_primary,
m_op_work_queue, ctx);
}
template <typename I>
Context *EnableRequest<I>::handle_get_tag_owner(int *result) {
ldout(m_cct, 10) << this << " " << __func__ << ": r=" << *result << dendl;
if (*result < 0) {
lderr(m_cct) << "failed to check tag ownership: " << cpp_strerror(*result)
<< dendl;
return m_on_finish;
}
if (!m_is_primary) {
lderr(m_cct) << "last journal tag not owned by local cluster" << dendl;
*result = -EINVAL;
return m_on_finish;
}
send_set_mirror_image();
return nullptr;
}
template <typename I>
void EnableRequest<I>::send_set_mirror_image() {
ldout(m_cct, 10) << this << " " << __func__ << dendl;
librados::ObjectWriteOperation op;
cls_client::mirror_image_set(&op, m_image_id, m_mirror_image);
using klass = EnableRequest<I>;
librados::AioCompletion *comp =
create_rados_callback<klass, &klass::handle_set_mirror_image>(this);
m_out_bl.clear();
int r = m_io_ctx.aio_operate(RBD_MIRRORING, comp, &op);
ceph_assert(r == 0);
comp->release();
}
template <typename I>
Context *EnableRequest<I>::handle_set_mirror_image(int *result) {
ldout(m_cct, 10) << this << " " << __func__ << ": r=" << *result << dendl;
if (*result < 0) {
lderr(m_cct) << "failed to enable mirroring: " << cpp_strerror(*result)
<< dendl;
return m_on_finish;
}
send_notify_mirroring_watcher();
return nullptr;
}
template <typename I>
void EnableRequest<I>::send_notify_mirroring_watcher() {
ldout(m_cct, 10) << this << " " << __func__ << dendl;
using klass = EnableRequest<I>;
Context *ctx = create_context_callback<
klass, &klass::handle_notify_mirroring_watcher>(this);
MirroringWatcher<>::notify_image_updated(m_io_ctx,
cls::rbd::MIRROR_IMAGE_STATE_ENABLED,
m_image_id,
m_mirror_image.global_image_id, ctx);
}
template <typename I>
Context *EnableRequest<I>::handle_notify_mirroring_watcher(int *result) {
ldout(m_cct, 10) << this << " " << __func__ << ": r=" << *result << dendl;
if (*result < 0) {
lderr(m_cct) << "failed to send update notification: "
<< cpp_strerror(*result) << dendl;
*result = 0;
}
return m_on_finish;
}
} // namespace mirror
} // namespace librbd
template class librbd::mirror::EnableRequest<librbd::ImageCtx>;
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