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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/RefreshParentRequest.h"
#include "include/rados/librados.hpp"
#include "common/dout.h"
#include "common/errno.h"
#include "common/WorkQueue.h"
#include "librbd/ImageCtx.h"
#include "librbd/Utils.h"
#include "librbd/image/CloseRequest.h"
#include "librbd/image/OpenRequest.h"
#include "librbd/io/ObjectDispatcher.h"
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::image::RefreshParentRequest: "
namespace librbd {
namespace image {
using util::create_async_context_callback;
using util::create_context_callback;
template <typename I>
RefreshParentRequest<I>::RefreshParentRequest(
I &child_image_ctx, const ParentImageInfo &parent_md,
const MigrationInfo &migration_info, Context *on_finish)
: m_child_image_ctx(child_image_ctx), m_parent_md(parent_md),
m_migration_info(migration_info), m_on_finish(on_finish),
m_parent_image_ctx(nullptr), m_parent_snap_id(CEPH_NOSNAP),
m_error_result(0) {
}
template <typename I>
bool RefreshParentRequest<I>::is_refresh_required(
I &child_image_ctx, const ParentImageInfo &parent_md,
const MigrationInfo &migration_info) {
ceph_assert(child_image_ctx.snap_lock.is_locked());
ceph_assert(child_image_ctx.parent_lock.is_locked());
return (is_open_required(child_image_ctx, parent_md, migration_info) ||
is_close_required(child_image_ctx, parent_md, migration_info));
}
template <typename I>
bool RefreshParentRequest<I>::is_close_required(
I &child_image_ctx, const ParentImageInfo &parent_md,
const MigrationInfo &migration_info) {
return (child_image_ctx.parent != nullptr &&
!does_parent_exist(child_image_ctx, parent_md, migration_info));
}
template <typename I>
bool RefreshParentRequest<I>::is_open_required(
I &child_image_ctx, const ParentImageInfo &parent_md,
const MigrationInfo &migration_info) {
return (does_parent_exist(child_image_ctx, parent_md, migration_info) &&
(child_image_ctx.parent == nullptr ||
child_image_ctx.parent->md_ctx.get_id() != parent_md.spec.pool_id ||
child_image_ctx.parent->md_ctx.get_namespace() !=
parent_md.spec.pool_namespace ||
child_image_ctx.parent->id != parent_md.spec.image_id ||
child_image_ctx.parent->snap_id != parent_md.spec.snap_id));
}
template <typename I>
bool RefreshParentRequest<I>::does_parent_exist(
I &child_image_ctx, const ParentImageInfo &parent_md,
const MigrationInfo &migration_info) {
if (child_image_ctx.child != nullptr &&
child_image_ctx.child->migration_info.empty() && parent_md.overlap == 0) {
// intermediate, non-migrating images should only open their parent if they
// overlap
return false;
}
return (parent_md.spec.pool_id > -1 && parent_md.overlap > 0) ||
!migration_info.empty();
}
template <typename I>
void RefreshParentRequest<I>::send() {
if (is_open_required(m_child_image_ctx, m_parent_md, m_migration_info)) {
send_open_parent();
} else {
// parent will be closed (if necessary) during finalize
send_complete(0);
}
}
template <typename I>
void RefreshParentRequest<I>::apply() {
ceph_assert(m_child_image_ctx.snap_lock.is_wlocked());
ceph_assert(m_child_image_ctx.parent_lock.is_wlocked());
std::swap(m_child_image_ctx.parent, m_parent_image_ctx);
}
template <typename I>
void RefreshParentRequest<I>::finalize(Context *on_finish) {
CephContext *cct = m_child_image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << dendl;
m_on_finish = on_finish;
if (m_parent_image_ctx != nullptr) {
send_close_parent();
} else {
send_complete(0);
}
}
template <typename I>
void RefreshParentRequest<I>::send_open_parent() {
ceph_assert(m_parent_md.spec.pool_id >= 0);
CephContext *cct = m_child_image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << dendl;
librados::IoCtx parent_io_ctx;
int r = util::create_ioctx(m_child_image_ctx.md_ctx, "parent image",
m_parent_md.spec.pool_id,
m_parent_md.spec.pool_namespace, &parent_io_ctx);
if (r < 0) {
send_complete(r);
return;
}
std::string image_name;
uint64_t flags = 0;
if (!m_migration_info.empty() && !m_migration_info.image_name.empty()) {
image_name = m_migration_info.image_name;
flags |= OPEN_FLAG_OLD_FORMAT;
}
m_parent_image_ctx = new I(image_name, m_parent_md.spec.image_id,
m_parent_md.spec.snap_id, parent_io_ctx, true);
m_parent_image_ctx->child = &m_child_image_ctx;
// set rados flags for reading the parent image
if (m_child_image_ctx.config.template get_val<bool>("rbd_balance_parent_reads")) {
m_parent_image_ctx->set_read_flag(librados::OPERATION_BALANCE_READS);
} else if (m_child_image_ctx.config.template get_val<bool>("rbd_localize_parent_reads")) {
m_parent_image_ctx->set_read_flag(librados::OPERATION_LOCALIZE_READS);
}
using klass = RefreshParentRequest<I>;
Context *ctx = create_async_context_callback(
m_child_image_ctx, create_context_callback<
klass, &klass::handle_open_parent, false>(this));
OpenRequest<I> *req = OpenRequest<I>::create(m_parent_image_ctx, flags, ctx);
req->send();
}
template <typename I>
Context *RefreshParentRequest<I>::handle_open_parent(int *result) {
CephContext *cct = m_child_image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << " r=" << *result << dendl;
save_result(result);
if (*result < 0) {
lderr(cct) << "failed to open parent image: " << cpp_strerror(*result)
<< dendl;
// image already closed by open state machine
delete m_parent_image_ctx;
m_parent_image_ctx = nullptr;
}
return m_on_finish;
}
template <typename I>
void RefreshParentRequest<I>::send_close_parent() {
ceph_assert(m_parent_image_ctx != nullptr);
CephContext *cct = m_child_image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << dendl;
using klass = RefreshParentRequest<I>;
Context *ctx = create_async_context_callback(
m_child_image_ctx, create_context_callback<
klass, &klass::handle_close_parent, false>(this));
CloseRequest<I> *req = CloseRequest<I>::create(m_parent_image_ctx, ctx);
req->send();
}
template <typename I>
Context *RefreshParentRequest<I>::handle_close_parent(int *result) {
CephContext *cct = m_child_image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << " r=" << *result << dendl;
delete m_parent_image_ctx;
m_parent_image_ctx = nullptr;
if (*result < 0) {
lderr(cct) << "failed to close parent image: " << cpp_strerror(*result)
<< dendl;
}
send_reset_existence_cache();
return nullptr;
}
template <typename I>
void RefreshParentRequest<I>::send_reset_existence_cache() {
CephContext *cct = m_child_image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << dendl;
Context *ctx = create_async_context_callback(
m_child_image_ctx, create_context_callback<
RefreshParentRequest<I>,
&RefreshParentRequest<I>::handle_reset_existence_cache, false>(this));
m_child_image_ctx.io_object_dispatcher->reset_existence_cache(ctx);
}
template <typename I>
Context *RefreshParentRequest<I>::handle_reset_existence_cache(int *result) {
CephContext *cct = m_child_image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << " r=" << *result << dendl;
if (*result < 0) {
lderr(cct) << "failed to reset object existence cache: "
<< cpp_strerror(*result) << dendl;
}
if (m_error_result < 0) {
// propagate errors from opening the image
*result = m_error_result;
} else {
*result = 0;
}
return m_on_finish;
}
template <typename I>
void RefreshParentRequest<I>::send_complete(int r) {
CephContext *cct = m_child_image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << dendl;
m_on_finish->complete(r);
}
} // namespace image
} // namespace librbd
template class librbd::image::RefreshParentRequest<librbd::ImageCtx>;
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