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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/operation/MigrateRequest.h"
#include "common/dout.h"
#include "common/errno.h"
#include "librbd/AsyncObjectThrottle.h"
#include "librbd/ExclusiveLock.h"
#include "librbd/ImageCtx.h"
#include "librbd/Utils.h"
#include "librbd/deep_copy/ObjectCopyRequest.h"
#include "librbd/io/AsyncOperation.h"
#include "librbd/io/ImageDispatcherInterface.h"
#include "librbd/io/ObjectRequest.h"
#include "osdc/Striper.h"
#include <boost/lambda/bind.hpp>
#include <boost/lambda/construct.hpp>
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::MigrateRequest: " << this << " " \
<< __func__ << ": "
namespace librbd {
namespace operation {
using util::create_context_callback;
using util::create_async_context_callback;
namespace {
template <typename I>
class C_MigrateObject : public C_AsyncObjectThrottle<I> {
public:
C_MigrateObject(AsyncObjectThrottle<I> &throttle, I *image_ctx,
IOContext io_context, uint64_t object_no)
: C_AsyncObjectThrottle<I>(throttle, *image_ctx), m_io_context(io_context),
m_object_no(object_no) {
}
int send() override {
I &image_ctx = this->m_image_ctx;
ceph_assert(ceph_mutex_is_locked(image_ctx.owner_lock));
CephContext *cct = image_ctx.cct;
if (image_ctx.exclusive_lock != nullptr &&
!image_ctx.exclusive_lock->is_lock_owner()) {
ldout(cct, 1) << "lost exclusive lock during migrate" << dendl;
return -ERESTART;
}
start_async_op();
return 0;
}
private:
IOContext m_io_context;
uint64_t m_object_no;
io::AsyncOperation *m_async_op = nullptr;
void start_async_op() {
I &image_ctx = this->m_image_ctx;
ceph_assert(ceph_mutex_is_locked(image_ctx.owner_lock));
CephContext *cct = image_ctx.cct;
ldout(cct, 10) << dendl;
ceph_assert(m_async_op == nullptr);
m_async_op = new io::AsyncOperation();
m_async_op->start_op(image_ctx);
if (!image_ctx.io_image_dispatcher->writes_blocked()) {
migrate_object();
return;
}
auto ctx = create_async_context_callback(
image_ctx, create_context_callback<
C_MigrateObject<I>, &C_MigrateObject<I>::handle_start_async_op>(this));
m_async_op->finish_op();
delete m_async_op;
m_async_op = nullptr;
image_ctx.io_image_dispatcher->wait_on_writes_unblocked(ctx);
}
void handle_start_async_op(int r) {
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
ldout(cct, 10) << "r=" << r << dendl;
if (r < 0) {
lderr(cct) << "failed to start async op: " << cpp_strerror(r) << dendl;
this->complete(r);
return;
}
std::shared_lock owner_locker{image_ctx.owner_lock};
start_async_op();
}
bool is_within_overlap_bounds() {
I &image_ctx = this->m_image_ctx;
std::shared_lock image_locker{image_ctx.image_lock};
auto overlap = std::min(image_ctx.size, image_ctx.migration_info.overlap);
return overlap > 0 &&
Striper::get_num_objects(image_ctx.layout, overlap) > m_object_no;
}
void migrate_object() {
I &image_ctx = this->m_image_ctx;
ceph_assert(ceph_mutex_is_locked(image_ctx.owner_lock));
CephContext *cct = image_ctx.cct;
auto ctx = create_context_callback<
C_MigrateObject<I>, &C_MigrateObject<I>::handle_migrate_object>(this);
if (is_within_overlap_bounds()) {
bufferlist bl;
auto req = new io::ObjectWriteRequest<I>(&image_ctx, m_object_no, 0,
std::move(bl), m_io_context, 0,
0, std::nullopt, {}, ctx);
ldout(cct, 20) << "copyup object req " << req << ", object_no "
<< m_object_no << dendl;
req->send();
} else {
ceph_assert(image_ctx.parent != nullptr);
uint32_t flags = deep_copy::OBJECT_COPY_REQUEST_FLAG_MIGRATION;
if (image_ctx.migration_info.flatten) {
flags |= deep_copy::OBJECT_COPY_REQUEST_FLAG_FLATTEN;
}
auto req = deep_copy::ObjectCopyRequest<I>::create(
image_ctx.parent, &image_ctx, 0, 0, image_ctx.migration_info.snap_map,
m_object_no, flags, nullptr, ctx);
ldout(cct, 20) << "deep copy object req " << req << ", object_no "
<< m_object_no << dendl;
req->send();
}
}
void handle_migrate_object(int r) {
CephContext *cct = this->m_image_ctx.cct;
ldout(cct, 10) << "r=" << r << dendl;
if (r == -ENOENT) {
r = 0;
}
m_async_op->finish_op();
delete m_async_op;
this->complete(r);
}
};
} // anonymous namespace
template <typename I>
void MigrateRequest<I>::send_op() {
I &image_ctx = this->m_image_ctx;
ceph_assert(ceph_mutex_is_locked(image_ctx.owner_lock));
CephContext *cct = image_ctx.cct;
ldout(cct, 10) << dendl;
migrate_objects();
}
template <typename I>
bool MigrateRequest<I>::should_complete(int r) {
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
ldout(cct, 10) << "r=" << r << dendl;
if (r < 0) {
lderr(cct) << "encountered error: " << cpp_strerror(r) << dendl;
}
return true;
}
template <typename I>
void MigrateRequest<I>::migrate_objects() {
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
ceph_assert(ceph_mutex_is_locked(image_ctx.owner_lock));
uint64_t overlap_objects = get_num_overlap_objects();
ldout(cct, 10) << "from 0 to " << overlap_objects << dendl;
auto ctx = create_context_callback<
MigrateRequest<I>, &MigrateRequest<I>::handle_migrate_objects>(this);
typename AsyncObjectThrottle<I>::ContextFactory context_factory(
boost::lambda::bind(boost::lambda::new_ptr<C_MigrateObject<I> >(),
boost::lambda::_1, &image_ctx, image_ctx.get_data_io_context(),
boost::lambda::_2));
AsyncObjectThrottle<I> *throttle = new AsyncObjectThrottle<I>(
this, image_ctx, context_factory, ctx, &m_prog_ctx, 0, overlap_objects);
throttle->start_ops(
image_ctx.config.template get_val<uint64_t>("rbd_concurrent_management_ops"));
}
template <typename I>
void MigrateRequest<I>::handle_migrate_objects(int r) {
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
ldout(cct, 5) << "r=" << r << dendl;
if (r < 0) {
lderr(cct) << "failed to migrate objects: " << cpp_strerror(r) << dendl;
}
this->complete(r);
}
template <typename I>
uint64_t MigrateRequest<I>::get_num_overlap_objects() {
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
ldout(cct, 10) << dendl;
std::shared_lock image_locker{image_ctx.image_lock};
auto overlap = image_ctx.migration_info.overlap;
return overlap > 0 ?
Striper::get_num_objects(image_ctx.layout, overlap) : 0;
}
} // namespace operation
} // namespace librbd
template class librbd::operation::MigrateRequest<librbd::ImageCtx>;
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