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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "SetHeadRequest.h"
#include "common/errno.h"
#include "cls/rbd/cls_rbd_client.h"
#include "cls/rbd/cls_rbd_types.h"
#include "librbd/ExclusiveLock.h"
#include "librbd/Utils.h"
#include "librbd/image/AttachParentRequest.h"
#include "librbd/image/DetachParentRequest.h"
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::deep_copy::SetHeadRequest: " \
<< this << " " << __func__ << ": "
namespace librbd {
namespace deep_copy {
using librbd::util::create_context_callback;
using librbd::util::create_rados_callback;
template <typename I>
SetHeadRequest<I>::SetHeadRequest(I *image_ctx, uint64_t size,
const cls::rbd::ParentImageSpec &spec,
uint64_t parent_overlap,
Context *on_finish)
: m_image_ctx(image_ctx), m_size(size), m_parent_spec(spec),
m_parent_overlap(parent_overlap), m_on_finish(on_finish),
m_cct(image_ctx->cct) {
ceph_assert(m_parent_overlap <= m_size);
}
template <typename I>
void SetHeadRequest<I>::send() {
send_set_size();
}
template <typename I>
void SetHeadRequest<I>::send_set_size() {
m_image_ctx->image_lock.lock_shared();
if (m_image_ctx->size == m_size) {
m_image_ctx->image_lock.unlock_shared();
send_detach_parent();
return;
}
m_image_ctx->image_lock.unlock_shared();
ldout(m_cct, 20) << dendl;
// Change the image size on disk so that the snapshot picks up
// the expected size. We can do this because the last snapshot
// we process is the sync snapshot which was created to match the
// image size. We also don't need to worry about trimming because
// we track the highest possible object number within the sync record
librados::ObjectWriteOperation op;
librbd::cls_client::set_size(&op, m_size);
int r;
auto finish_op_ctx = start_lock_op(&r);
if (finish_op_ctx == nullptr) {
lderr(m_cct) << "lost exclusive lock" << dendl;
finish(r);
return;
}
auto ctx = new LambdaContext([this, finish_op_ctx](int r) {
handle_set_size(r);
finish_op_ctx->complete(0);
});
librados::AioCompletion *comp = create_rados_callback(ctx);
r = m_image_ctx->md_ctx.aio_operate(m_image_ctx->header_oid, comp, &op);
ceph_assert(r == 0);
comp->release();
}
template <typename I>
void SetHeadRequest<I>::handle_set_size(int r) {
ldout(m_cct, 20) << "r=" << r << dendl;
if (r < 0) {
lderr(m_cct) << "failed to update image size: " << cpp_strerror(r) << dendl;
finish(r);
return;
}
{
// adjust in-memory image size now that it's updated on disk
std::unique_lock image_locker{m_image_ctx->image_lock};
if (m_image_ctx->size > m_size) {
if (m_image_ctx->parent_md.spec.pool_id != -1 &&
m_image_ctx->parent_md.overlap > m_size) {
m_image_ctx->parent_md.overlap = m_size;
}
}
m_image_ctx->size = m_size;
}
send_detach_parent();
}
template <typename I>
void SetHeadRequest<I>::send_detach_parent() {
m_image_ctx->image_lock.lock_shared();
if (m_image_ctx->parent_md.spec.pool_id == -1 ||
(m_image_ctx->parent_md.spec == m_parent_spec &&
m_image_ctx->parent_md.overlap == m_parent_overlap)) {
m_image_ctx->image_lock.unlock_shared();
send_attach_parent();
return;
}
m_image_ctx->image_lock.unlock_shared();
ldout(m_cct, 20) << dendl;
int r;
auto finish_op_ctx = start_lock_op(&r);
if (finish_op_ctx == nullptr) {
lderr(m_cct) << "lost exclusive lock" << dendl;
finish(r);
return;
}
auto ctx = new LambdaContext([this, finish_op_ctx](int r) {
handle_detach_parent(r);
finish_op_ctx->complete(0);
});
auto req = image::DetachParentRequest<I>::create(*m_image_ctx, ctx);
req->send();
}
template <typename I>
void SetHeadRequest<I>::handle_detach_parent(int r) {
ldout(m_cct, 20) << "r=" << r << dendl;
if (r < 0) {
lderr(m_cct) << "failed to remove parent: " << cpp_strerror(r) << dendl;
finish(r);
return;
}
{
// adjust in-memory parent now that it's updated on disk
std::unique_lock image_locker{m_image_ctx->image_lock};
m_image_ctx->parent_md.spec = {};
m_image_ctx->parent_md.overlap = 0;
}
send_attach_parent();
}
template <typename I>
void SetHeadRequest<I>::send_attach_parent() {
m_image_ctx->image_lock.lock_shared();
if (m_image_ctx->parent_md.spec == m_parent_spec &&
m_image_ctx->parent_md.overlap == m_parent_overlap) {
m_image_ctx->image_lock.unlock_shared();
finish(0);
return;
}
m_image_ctx->image_lock.unlock_shared();
ldout(m_cct, 20) << dendl;
int r;
auto finish_op_ctx = start_lock_op(&r);
if (finish_op_ctx == nullptr) {
lderr(m_cct) << "lost exclusive lock" << dendl;
finish(r);
return;
}
auto ctx = new LambdaContext([this, finish_op_ctx](int r) {
handle_attach_parent(r);
finish_op_ctx->complete(0);
});
auto req = image::AttachParentRequest<I>::create(
*m_image_ctx, m_parent_spec, m_parent_overlap, false, ctx);
req->send();
}
template <typename I>
void SetHeadRequest<I>::handle_attach_parent(int r) {
ldout(m_cct, 20) << "r=" << r << dendl;
if (r < 0) {
lderr(m_cct) << "failed to attach parent: " << cpp_strerror(r) << dendl;
finish(r);
return;
}
{
// adjust in-memory parent now that it's updated on disk
std::unique_lock image_locker{m_image_ctx->image_lock};
m_image_ctx->parent_md.spec = m_parent_spec;
m_image_ctx->parent_md.overlap = m_parent_overlap;
}
finish(0);
}
template <typename I>
Context *SetHeadRequest<I>::start_lock_op(int* r) {
std::shared_lock owner_locker{m_image_ctx->owner_lock};
if (m_image_ctx->exclusive_lock == nullptr) {
return new LambdaContext([](int r) {});
}
return m_image_ctx->exclusive_lock->start_op(r);
}
template <typename I>
void SetHeadRequest<I>::finish(int r) {
ldout(m_cct, 20) << "r=" << r << dendl;
m_on_finish->complete(r);
delete this;
}
} // namespace deep_copy
} // namespace librbd
template class librbd::deep_copy::SetHeadRequest<librbd::ImageCtx>;
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