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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/FlattenRequest.h"
#include "librbd/AsyncObjectThrottle.h"
#include "librbd/ExclusiveLock.h"
#include "librbd/ImageCtx.h"
#include "librbd/crypto/CryptoInterface.h"
#include "librbd/crypto/EncryptionFormat.h"
#include "librbd/image/DetachChildRequest.h"
#include "librbd/image/DetachParentRequest.h"
#include "librbd/Types.h"
#include "librbd/io/ObjectRequest.h"
#include "librbd/io/Utils.h"
#include "common/dout.h"
#include "common/errno.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::operation::FlattenRequest: " << this \
<< " " << __func__ << ": "
namespace librbd {
namespace operation {
using util::create_context_callback;
using util::create_rados_callback;
template <typename I>
class C_FlattenObject : public C_AsyncObjectThrottle<I> {
public:
C_FlattenObject(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 flatten" << dendl;
return -ERESTART;
}
{
std::shared_lock image_lock{image_ctx.image_lock};
if (image_ctx.object_map != nullptr &&
!image_ctx.object_map->object_may_not_exist(m_object_no)) {
// can skip because the object already exists
return 1;
}
}
if (!io::util::trigger_copyup(
&image_ctx, m_object_no, m_io_context, this)) {
// stop early if the parent went away - it just means
// another flatten finished first or the image was resized
return 1;
}
return 0;
}
private:
IOContext m_io_context;
uint64_t m_object_no;
};
template <typename I>
bool FlattenRequest<I>::should_complete(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) << "encountered error: " << cpp_strerror(r) << dendl;
}
return true;
}
template <typename I>
void FlattenRequest<I>::send_op() {
flatten_objects();
}
template <typename I>
void FlattenRequest<I>::flatten_objects() {
I &image_ctx = this->m_image_ctx;
ceph_assert(ceph_mutex_is_locked(image_ctx.owner_lock));
CephContext *cct = image_ctx.cct;
ldout(cct, 5) << dendl;
assert(ceph_mutex_is_locked(image_ctx.owner_lock));
auto ctx = create_context_callback<
FlattenRequest<I>,
&FlattenRequest<I>::handle_flatten_objects>(this);
typename AsyncObjectThrottle<I>::ContextFactory context_factory(
boost::lambda::bind(boost::lambda::new_ptr<C_FlattenObject<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, m_start_object_no,
m_start_object_no + m_overlap_objects);
throttle->start_ops(
image_ctx.config.template get_val<uint64_t>("rbd_concurrent_management_ops"));
}
template <typename I>
void FlattenRequest<I>::handle_flatten_objects(int r) {
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
ldout(cct, 5) << "r=" << r << dendl;
if (r == -ERESTART) {
ldout(cct, 5) << "flatten operation interrupted" << dendl;
this->complete(r);
return;
} else if (r < 0) {
lderr(cct) << "flatten encountered an error: " << cpp_strerror(r) << dendl;
this->complete(r);
return;
}
crypto_flatten();
}
template <typename I>
void FlattenRequest<I>::crypto_flatten() {
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
auto encryption_format = image_ctx.encryption_format.get();
if (encryption_format == nullptr) {
detach_child();
return;
}
ldout(cct, 5) << dendl;
auto ctx = create_context_callback<
FlattenRequest<I>,
&FlattenRequest<I>::handle_crypto_flatten>(this);
encryption_format->flatten(&image_ctx, ctx);
}
template <typename I>
void FlattenRequest<I>::handle_crypto_flatten(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) << "error flattening crypto: " << cpp_strerror(r) << dendl;
this->complete(r);
return;
}
detach_child();
}
template <typename I>
void FlattenRequest<I>::detach_child() {
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
// should have been canceled prior to releasing lock
image_ctx.owner_lock.lock_shared();
ceph_assert(image_ctx.exclusive_lock == nullptr ||
image_ctx.exclusive_lock->is_lock_owner());
// if there are no snaps, remove from the children object as well
// (if snapshots remain, they have their own parent info, and the child
// will be removed when the last snap goes away)
image_ctx.image_lock.lock_shared();
if ((image_ctx.features & RBD_FEATURE_DEEP_FLATTEN) == 0 &&
!image_ctx.snaps.empty()) {
image_ctx.image_lock.unlock_shared();
image_ctx.owner_lock.unlock_shared();
detach_parent();
return;
}
image_ctx.image_lock.unlock_shared();
ldout(cct, 5) << dendl;
auto ctx = create_context_callback<
FlattenRequest<I>,
&FlattenRequest<I>::handle_detach_child>(this);
auto req = image::DetachChildRequest<I>::create(image_ctx, ctx);
req->send();
image_ctx.owner_lock.unlock_shared();
}
template <typename I>
void FlattenRequest<I>::handle_detach_child(int r) {
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
ldout(cct, 5) << "r=" << r << dendl;
if (r < 0 && r != -ENOENT) {
lderr(cct) << "detach encountered an error: " << cpp_strerror(r) << dendl;
this->complete(r);
return;
}
detach_parent();
}
template <typename I>
void FlattenRequest<I>::detach_parent() {
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
ldout(cct, 5) << dendl;
// should have been canceled prior to releasing lock
image_ctx.owner_lock.lock_shared();
ceph_assert(image_ctx.exclusive_lock == nullptr ||
image_ctx.exclusive_lock->is_lock_owner());
// stop early if the parent went away - it just means
// another flatten finished first, so this one is useless.
image_ctx.image_lock.lock_shared();
if (!image_ctx.parent) {
ldout(cct, 5) << "image already flattened" << dendl;
image_ctx.image_lock.unlock_shared();
image_ctx.owner_lock.unlock_shared();
this->complete(0);
return;
}
image_ctx.image_lock.unlock_shared();
// remove parent from this (base) image
auto ctx = create_context_callback<
FlattenRequest<I>,
&FlattenRequest<I>::handle_detach_parent>(this);
auto req = image::DetachParentRequest<I>::create(image_ctx, ctx);
req->send();
image_ctx.owner_lock.unlock_shared();
}
template <typename I>
void FlattenRequest<I>::handle_detach_parent(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) << "remove parent encountered an error: " << cpp_strerror(r)
<< dendl;
}
this->complete(r);
}
} // namespace operation
} // namespace librbd
template class librbd::operation::FlattenRequest<librbd::ImageCtx>;
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