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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/object_map/SnapshotRollbackRequest.h"
#include "common/dout.h"
#include "librbd/ImageCtx.h"
#include "librbd/ObjectMap.h"
#include "librbd/object_map/InvalidateRequest.h"
#include "cls/lock/cls_lock_client.h"
#include <iostream>
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::object_map::SnapshotRollbackRequest: "
namespace librbd {
namespace object_map {
namespace {
std::ostream& operator<<(std::ostream& os,
const SnapshotRollbackRequest::State& state) {
switch(state) {
case SnapshotRollbackRequest::STATE_READ_MAP:
os << "READ_MAP";
break;
case SnapshotRollbackRequest::STATE_INVALIDATE_MAP:
os << "INVALIDATE_MAP";
break;
case SnapshotRollbackRequest::STATE_WRITE_MAP:
os << "WRITE_MAP";
break;
default:
os << "UNKNOWN (" << static_cast<uint32_t>(state) << ")";
break;
}
return os;
}
} // anonymous namespace
void SnapshotRollbackRequest::send() {
send_read_map();
}
bool SnapshotRollbackRequest::should_complete(int r) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 5) << this << " " << __func__ << ": state=" << m_state << ", "
<< "r=" << r << dendl;
if (r < 0 && m_ret_val == 0) {
m_ret_val = r;
}
bool finished = false;
switch (m_state) {
case STATE_READ_MAP:
if (r < 0) {
// invalidate the snapshot object map
send_invalidate_map();
} else {
send_write_map();
}
break;
case STATE_INVALIDATE_MAP:
// invalidate the HEAD object map as well
finished = Request::should_complete(m_ret_val);
break;
case STATE_WRITE_MAP:
finished = Request::should_complete(r);
break;
default:
ceph_abort();
break;
}
return finished;
}
void SnapshotRollbackRequest::send_read_map() {
std::string snap_oid(ObjectMap<>::object_map_name(m_image_ctx.id, m_snap_id));
CephContext *cct = m_image_ctx.cct;
ldout(cct, 5) << this << " " << __func__ << ": snap_oid=" << snap_oid
<< dendl;
m_state = STATE_READ_MAP;
librados::ObjectReadOperation op;
op.read(0, 0, NULL, NULL);
librados::AioCompletion *rados_completion = create_callback_completion();
int r = m_image_ctx.md_ctx.aio_operate(snap_oid, rados_completion, &op,
&m_read_bl);
ceph_assert(r == 0);
rados_completion->release();
}
void SnapshotRollbackRequest::send_write_map() {
std::shared_lock owner_locker{m_image_ctx.owner_lock};
CephContext *cct = m_image_ctx.cct;
std::string snap_oid(ObjectMap<>::object_map_name(m_image_ctx.id,
CEPH_NOSNAP));
ldout(cct, 5) << this << " " << __func__ << ": snap_oid=" << snap_oid
<< dendl;
m_state = STATE_WRITE_MAP;
librados::ObjectWriteOperation op;
rados::cls::lock::assert_locked(&op, RBD_LOCK_NAME, ClsLockType::EXCLUSIVE, "", "");
op.write_full(m_read_bl);
librados::AioCompletion *rados_completion = create_callback_completion();
int r = m_image_ctx.md_ctx.aio_operate(snap_oid, rados_completion, &op);
ceph_assert(r == 0);
rados_completion->release();
}
void SnapshotRollbackRequest::send_invalidate_map() {
std::shared_lock owner_locker{m_image_ctx.owner_lock};
std::unique_lock image_locker{m_image_ctx.image_lock};
CephContext *cct = m_image_ctx.cct;
ldout(cct, 5) << this << " " << __func__ << dendl;
m_state = STATE_INVALIDATE_MAP;
InvalidateRequest<> *req = new InvalidateRequest<>(m_image_ctx, m_snap_id,
false,
create_callback_context());
req->send();
}
} // namespace object_map
} // namespace librbd
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