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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/image/AttachChildRequest.h"
#include "common/dout.h"
#include "common/errno.h"
#include "cls/rbd/cls_rbd_client.h"
#include "librbd/ImageCtx.h"
#include "librbd/Utils.h"
#include "librbd/image/RefreshRequest.h"
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::image::AttachChildRequest: " << this \
<< " " << __func__ << ": "
namespace librbd {
namespace image {
using util::create_context_callback;
using util::create_rados_callback;
template <typename I>
AttachChildRequest<I>::AttachChildRequest(
I *image_ctx, I *parent_image_ctx, const librados::snap_t &parent_snap_id,
I *old_parent_image_ctx, const librados::snap_t &old_parent_snap_id,
uint32_t clone_format, Context* on_finish)
: m_image_ctx(image_ctx), m_parent_image_ctx(parent_image_ctx),
m_parent_snap_id(parent_snap_id),
m_old_parent_image_ctx(old_parent_image_ctx),
m_old_parent_snap_id(old_parent_snap_id), m_clone_format(clone_format),
m_on_finish(on_finish), m_cct(m_image_ctx->cct) {
}
template <typename I>
void AttachChildRequest<I>::send() {
if (m_clone_format == 1) {
v1_add_child();
} else {
v2_set_op_feature();
}
}
template <typename I>
void AttachChildRequest<I>::v1_add_child() {
ldout(m_cct, 15) << dendl;
librados::ObjectWriteOperation op;
cls_client::add_child(&op, {m_parent_image_ctx->md_ctx.get_id(), "",
m_parent_image_ctx->id,
m_parent_snap_id}, m_image_ctx->id);
using klass = AttachChildRequest<I>;
librados::AioCompletion *comp =
create_rados_callback<klass, &klass::handle_v1_add_child>(this);
int r = m_image_ctx->md_ctx.aio_operate(RBD_CHILDREN, comp, &op);
ceph_assert(r == 0);
comp->release();
}
template <typename I>
void AttachChildRequest<I>::handle_v1_add_child(int r) {
ldout(m_cct, 15) << "r=" << r << dendl;
if (r < 0) {
if (r == -EEXIST && m_old_parent_image_ctx != nullptr) {
ldout(m_cct, 5) << "child already exists" << dendl;
} else {
lderr(m_cct) << "couldn't add child: " << cpp_strerror(r) << dendl;
finish(r);
return;
}
}
v1_refresh();
}
template <typename I>
void AttachChildRequest<I>::v1_refresh() {
ldout(m_cct, 15) << dendl;
using klass = AttachChildRequest<I>;
RefreshRequest<I> *req = RefreshRequest<I>::create(
*m_parent_image_ctx, false, false,
create_context_callback<klass, &klass::handle_v1_refresh>(this));
req->send();
}
template <typename I>
void AttachChildRequest<I>::handle_v1_refresh(int r) {
ldout(m_cct, 15) << "r=" << r << dendl;
bool snap_protected = false;
if (r == 0) {
std::shared_lock image_locker{m_parent_image_ctx->image_lock};
r = m_parent_image_ctx->is_snap_protected(m_parent_snap_id,
&snap_protected);
}
if (r < 0 || !snap_protected) {
lderr(m_cct) << "validate protected failed" << dendl;
finish(-EINVAL);
return;
}
v1_remove_child_from_old_parent();
}
template <typename I>
void AttachChildRequest<I>::v1_remove_child_from_old_parent() {
if (m_old_parent_image_ctx == nullptr) {
finish(0);
return;
}
ldout(m_cct, 15) << dendl;
librados::ObjectWriteOperation op;
cls_client::remove_child(&op, {m_old_parent_image_ctx->md_ctx.get_id(),
m_old_parent_image_ctx->md_ctx.get_namespace(),
m_old_parent_image_ctx->id,
m_old_parent_snap_id}, m_image_ctx->id);
using klass = AttachChildRequest<I>;
librados::AioCompletion *comp = create_rados_callback<
klass, &klass::handle_v1_remove_child_from_old_parent>(this);
int r = m_image_ctx->md_ctx.aio_operate(RBD_CHILDREN, comp, &op);
ceph_assert(r == 0);
comp->release();
}
template <typename I>
void AttachChildRequest<I>::handle_v1_remove_child_from_old_parent(int r) {
ldout(m_cct, 15) << "r=" << r << dendl;
if (r < 0 && r != -ENOENT) {
lderr(m_cct) << "couldn't remove child: " << cpp_strerror(r) << dendl;
finish(r);
return;
}
finish(0);
}
template <typename I>
void AttachChildRequest<I>::v2_set_op_feature() {
ldout(m_cct, 15) << dendl;
librados::ObjectWriteOperation op;
cls_client::op_features_set(&op, RBD_OPERATION_FEATURE_CLONE_CHILD,
RBD_OPERATION_FEATURE_CLONE_CHILD);
using klass = AttachChildRequest<I>;
auto aio_comp = create_rados_callback<
klass, &klass::handle_v2_set_op_feature>(this);
int r = m_image_ctx->md_ctx.aio_operate(m_image_ctx->header_oid, aio_comp,
&op);
ceph_assert(r == 0);
aio_comp->release();
}
template <typename I>
void AttachChildRequest<I>::handle_v2_set_op_feature(int r) {
ldout(m_cct, 15) << "r=" << r << dendl;
if (r < 0) {
lderr(m_cct) << "failed to enable clone v2: " << cpp_strerror(r) << dendl;
finish(r);
return;
}
v2_child_attach();
}
template <typename I>
void AttachChildRequest<I>::v2_child_attach() {
ldout(m_cct, 15) << dendl;
librados::ObjectWriteOperation op;
cls_client::child_attach(&op, m_parent_snap_id,
{m_image_ctx->md_ctx.get_id(),
m_image_ctx->md_ctx.get_namespace(),
m_image_ctx->id});
using klass = AttachChildRequest<I>;
auto aio_comp = create_rados_callback<
klass, &klass::handle_v2_child_attach>(this);
int r = m_parent_image_ctx->md_ctx.aio_operate(m_parent_image_ctx->header_oid,
aio_comp, &op);
ceph_assert(r == 0);
aio_comp->release();
}
template <typename I>
void AttachChildRequest<I>::handle_v2_child_attach(int r) {
ldout(m_cct, 15) << "r=" << r << dendl;
if (r < 0) {
if (r == -EEXIST && m_old_parent_image_ctx != nullptr) {
ldout(m_cct, 5) << "child already exists" << dendl;
} else {
lderr(m_cct) << "failed to attach child image: " << cpp_strerror(r)
<< dendl;
finish(r);
return;
}
}
v2_child_detach_from_old_parent();
}
template <typename I>
void AttachChildRequest<I>::v2_child_detach_from_old_parent() {
if (m_old_parent_image_ctx == nullptr) {
finish(0);
return;
}
ldout(m_cct, 15) << dendl;
librados::ObjectWriteOperation op;
cls_client::child_detach(&op, m_old_parent_snap_id,
{m_image_ctx->md_ctx.get_id(),
m_image_ctx->md_ctx.get_namespace(),
m_image_ctx->id});
using klass = AttachChildRequest<I>;
auto aio_comp = create_rados_callback<
klass, &klass::handle_v2_child_detach_from_old_parent>(this);
int r = m_old_parent_image_ctx->md_ctx.aio_operate(
m_old_parent_image_ctx->header_oid, aio_comp, &op);
ceph_assert(r == 0);
aio_comp->release();
}
template <typename I>
void AttachChildRequest<I>::handle_v2_child_detach_from_old_parent(int r) {
ldout(m_cct, 15) << "r=" << r << dendl;
if (r < 0 && r != -ENOENT) {
lderr(m_cct) << "failed to detach child image: " << cpp_strerror(r)
<< dendl;
finish(r);
return;
}
finish(0);
}
template <typename I>
void AttachChildRequest<I>::finish(int r) {
ldout(m_cct, 5) << "r=" << r << dendl;
m_on_finish->complete(r);
delete this;
}
} // namespace image
} // namespace librbd
template class librbd::image::AttachChildRequest<librbd::ImageCtx>;
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