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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/ValidatePoolRequest.h"
#include "include/rados/librados.hpp"
#include "include/ceph_assert.h"
#include "common/dout.h"
#include "common/errno.h"
#include "librbd/ImageCtx.h"
#include "librbd/Utils.h"
#include "librbd/asio/ContextWQ.h"
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::image::ValidatePoolRequest: " \
<< __func__ << ": "
namespace librbd {
namespace image {
namespace {
const std::string OVERWRITE_VALIDATED("overwrite validated");
const std::string VALIDATE("validate");
} // anonymous namespace
using util::create_rados_callback;
using util::create_context_callback;
using util::create_async_context_callback;
template <typename I>
ValidatePoolRequest<I>::ValidatePoolRequest(librados::IoCtx& io_ctx,
Context *on_finish)
: m_cct(reinterpret_cast<CephContext*>(io_ctx.cct())),
m_on_finish(on_finish) {
// validatation should occur in default namespace
m_io_ctx.dup(io_ctx);
m_io_ctx.set_namespace("");
}
template <typename I>
void ValidatePoolRequest<I>::send() {
read_rbd_info();
}
template <typename I>
void ValidatePoolRequest<I>::read_rbd_info() {
ldout(m_cct, 5) << dendl;
auto comp = create_rados_callback<
ValidatePoolRequest<I>,
&ValidatePoolRequest<I>::handle_read_rbd_info>(this);
librados::ObjectReadOperation op;
op.read(0, 0, nullptr, nullptr);
m_out_bl.clear();
int r = m_io_ctx.aio_operate(RBD_INFO, comp, &op, &m_out_bl);
ceph_assert(r == 0);
comp->release();
}
template <typename I>
void ValidatePoolRequest<I>::handle_read_rbd_info(int r) {
ldout(m_cct, 5) << "r=" << r << dendl;
if (r >= 0) {
bufferlist validated_bl;
validated_bl.append(OVERWRITE_VALIDATED);
bufferlist validate_bl;
validate_bl.append(VALIDATE);
if (m_out_bl.contents_equal(validated_bl)) {
// already validated pool
finish(0);
return;
} else if (m_out_bl.contents_equal(validate_bl)) {
// implies snapshot was already successfully created
overwrite_rbd_info();
return;
}
} else if (r < 0 && r != -ENOENT) {
lderr(m_cct) << "failed to read RBD info: " << cpp_strerror(r) << dendl;
finish(r);
return;
}
create_snapshot();
}
template <typename I>
void ValidatePoolRequest<I>::create_snapshot() {
ldout(m_cct, 5) << dendl;
// allocate a self-managed snapshot id if this a new pool to force
// self-managed snapshot mode
auto comp = create_rados_callback<
ValidatePoolRequest<I>,
&ValidatePoolRequest<I>::handle_create_snapshot>(this);
m_io_ctx.aio_selfmanaged_snap_create(&m_snap_id, comp);
comp->release();
}
template <typename I>
void ValidatePoolRequest<I>::handle_create_snapshot(int r) {
ldout(m_cct, 5) << "r=" << r << dendl;
if (r == -EINVAL) {
lderr(m_cct) << "pool not configured for self-managed RBD snapshot support"
<< dendl;
finish(r);
return;
} else if (r < 0) {
lderr(m_cct) << "failed to allocate self-managed snapshot: "
<< cpp_strerror(r) << dendl;
finish(r);
return;
}
write_rbd_info();
}
template <typename I>
void ValidatePoolRequest<I>::write_rbd_info() {
ldout(m_cct, 5) << dendl;
bufferlist bl;
bl.append(VALIDATE);
librados::ObjectWriteOperation op;
op.create(true);
op.write(0, bl);
auto comp = create_rados_callback<
ValidatePoolRequest<I>,
&ValidatePoolRequest<I>::handle_write_rbd_info>(this);
int r = m_io_ctx.aio_operate(RBD_INFO, comp, &op);
ceph_assert(r == 0);
comp->release();
}
template <typename I>
void ValidatePoolRequest<I>::handle_write_rbd_info(int r) {
ldout(m_cct, 5) << "r=" << r << dendl;
if (r == -EOPNOTSUPP) {
lderr(m_cct) << "pool missing required overwrite support" << dendl;
m_ret_val = -EINVAL;
} else if (r < 0 && r != -EEXIST) {
lderr(m_cct) << "failed to write RBD info: " << cpp_strerror(r) << dendl;
m_ret_val = r;
}
remove_snapshot();
}
template <typename I>
void ValidatePoolRequest<I>::remove_snapshot() {
ldout(m_cct, 5) << dendl;
auto comp = create_rados_callback<
ValidatePoolRequest<I>,
&ValidatePoolRequest<I>::handle_remove_snapshot>(this);
m_io_ctx.aio_selfmanaged_snap_remove(m_snap_id, comp);
comp->release();
}
template <typename I>
void ValidatePoolRequest<I>::handle_remove_snapshot(int r) {
ldout(m_cct, 5) << "r=" << r << dendl;
if (r < 0) {
// not a fatal error
lderr(m_cct) << "failed to remove validation snapshot: " << cpp_strerror(r)
<< dendl;
}
if (m_ret_val < 0) {
finish(m_ret_val);
return;
}
overwrite_rbd_info();
}
template <typename I>
void ValidatePoolRequest<I>::overwrite_rbd_info() {
ldout(m_cct, 5) << dendl;
bufferlist bl;
bl.append(OVERWRITE_VALIDATED);
librados::ObjectWriteOperation op;
op.write(0, bl);
auto comp = create_rados_callback<
ValidatePoolRequest<I>,
&ValidatePoolRequest<I>::handle_overwrite_rbd_info>(this);
int r = m_io_ctx.aio_operate(RBD_INFO, comp, &op);
ceph_assert(r == 0);
comp->release();
}
template <typename I>
void ValidatePoolRequest<I>::handle_overwrite_rbd_info(int r) {
ldout(m_cct, 5) << "r=" << r << dendl;
if (r == -EOPNOTSUPP) {
lderr(m_cct) << "pool missing required overwrite support" << dendl;
finish(-EINVAL);
return;
} else if (r < 0) {
lderr(m_cct) << "failed to validate overwrite support: " << cpp_strerror(r)
<< dendl;
finish(r);
return;
}
finish(0);
}
template <typename I>
void ValidatePoolRequest<I>::finish(int r) {
ldout(m_cct, 5) << "r=" << r << dendl;
m_on_finish->complete(r);
delete this;
}
} // namespace image
} // namespace librbd
template class librbd::image::ValidatePoolRequest<librbd::ImageCtx>;
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