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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/image/DetachChildRequest.h"
#include "librbd/image/DetachParentRequest.h"
#include "librbd/Types.h"
#include "librbd/io/ObjectRequest.h"
#include "common/dout.h"
#include "common/errno.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,
::SnapContext snapc, uint64_t object_no)
: C_AsyncObjectThrottle<I>(throttle, *image_ctx), m_snapc(snapc),
m_object_no(object_no) {
}
int send() override {
I &image_ctx = this->m_image_ctx;
ceph_assert(image_ctx.owner_lock.is_locked());
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;
}
{
RWLock::RLocker snap_lock(image_ctx.snap_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;
}
}
bufferlist bl;
string oid = image_ctx.get_object_name(m_object_no);
auto req = new io::ObjectWriteRequest<I>(&image_ctx, oid, m_object_no, 0,
std::move(bl), m_snapc, 0, {},
this);
if (!req->has_parent()) {
// stop early if the parent went away - it just means
// another flatten finished first or the image was resized
delete req;
return 1;
}
req->send();
return 0;
}
private:
::SnapContext m_snapc;
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(image_ctx.owner_lock.is_locked());
CephContext *cct = image_ctx.cct;
ldout(cct, 5) << dendl;
assert(image_ctx.owner_lock.is_locked());
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, m_snapc, boost::lambda::_2));
AsyncObjectThrottle<I> *throttle = new AsyncObjectThrottle<I>(
this, image_ctx, context_factory, ctx, &m_prog_ctx, 0, 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;
}
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.get_read();
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.snap_lock.get_read();
if ((image_ctx.features & RBD_FEATURE_DEEP_FLATTEN) == 0 &&
!image_ctx.snaps.empty()) {
image_ctx.snap_lock.put_read();
image_ctx.owner_lock.put_read();
detach_parent();
return;
}
image_ctx.snap_lock.put_read();
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.put_read();
}
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.get_read();
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.parent_lock.get_read();
if (!image_ctx.parent) {
ldout(cct, 5) << "image already flattened" << dendl;
image_ctx.parent_lock.put_read();
image_ctx.owner_lock.put_read();
this->complete(0);
return;
}
image_ctx.parent_lock.put_read();
// 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.put_read();
}
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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