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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/RenameRequest.h"
#include "common/dout.h"
#include "common/errno.h"
#include "include/rados/librados.hpp"
#include "librbd/ImageCtx.h"
#include "librbd/internal.h"
#include "librbd/Utils.h"
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::operation::RenameRequest: "
namespace librbd {
namespace operation {
namespace {
template <typename I>
std::ostream& operator<<(std::ostream& os,
const typename RenameRequest<I>::State& state) {
switch(state) {
case RenameRequest<I>::STATE_READ_SOURCE_HEADER:
os << "READ_SOURCE_HEADER";
break;
case RenameRequest<I>::STATE_WRITE_DEST_HEADER:
os << "WRITE_DEST_HEADER";
break;
case RenameRequest<I>::STATE_UPDATE_DIRECTORY:
os << "UPDATE_DIRECTORY";
break;
case RenameRequest<I>::STATE_REMOVE_SOURCE_HEADER:
os << "REMOVE_SOURCE_HEADER";
break;
default:
os << "UNKNOWN (" << static_cast<uint32_t>(state) << ")";
break;
}
return os;
}
} // anonymous namespace
template <typename I>
RenameRequest<I>::RenameRequest(I &image_ctx, Context *on_finish,
const std::string &dest_name)
: Request<I>(image_ctx, on_finish), m_dest_name(dest_name),
m_source_oid(image_ctx.old_format ? util::old_header_name(image_ctx.name) :
util::id_obj_name(image_ctx.name)),
m_dest_oid(image_ctx.old_format ? util::old_header_name(dest_name) :
util::id_obj_name(dest_name)) {
}
template <typename I>
void RenameRequest<I>::send_op() {
send_read_source_header();
}
template <typename I>
bool RenameRequest<I>::should_complete(int r) {
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
ldout(cct, 5) << this << " " << __func__ << ": state=" << m_state << ", "
<< "r=" << r << dendl;
r = filter_return_code(r);
if (r < 0) {
if (r == -EEXIST) {
ldout(cct, 1) << "image already exists" << dendl;
} else {
lderr(cct) << "encountered error: " << cpp_strerror(r) << dendl;
}
return true;
}
if (m_state == STATE_UPDATE_DIRECTORY) {
// update in-memory name before removing source header
apply();
} else if (m_state == STATE_REMOVE_SOURCE_HEADER) {
return true;
}
RWLock::RLocker owner_lock(image_ctx.owner_lock);
switch (m_state) {
case STATE_READ_SOURCE_HEADER:
send_write_destination_header();
break;
case STATE_WRITE_DEST_HEADER:
send_update_directory();
break;
case STATE_UPDATE_DIRECTORY:
send_remove_source_header();
break;
default:
ceph_abort();
break;
}
return false;
}
template <typename I>
int RenameRequest<I>::filter_return_code(int r) const {
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
if (m_state == STATE_READ_SOURCE_HEADER && r == -ENOENT) {
RWLock::RLocker snap_locker(image_ctx.snap_lock);
if (image_ctx.name == m_dest_name) {
// signal that replay raced with itself
return -EEXIST;
}
} else if (m_state == STATE_REMOVE_SOURCE_HEADER && r < 0) {
if (r != -ENOENT) {
lderr(cct) << "warning: couldn't remove old source object ("
<< m_source_oid << ")" << dendl;
}
return 0;
}
return r;
}
template <typename I>
void RenameRequest<I>::send_read_source_header() {
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
ldout(cct, 5) << this << " " << __func__ << dendl;
m_state = STATE_READ_SOURCE_HEADER;
librados::ObjectReadOperation op;
op.read(0, 0, NULL, NULL);
// TODO: old code read omap values but there are no omap values on the
// old format header nor the new format id object
librados::AioCompletion *rados_completion = this->create_callback_completion();
int r = image_ctx.md_ctx.aio_operate(m_source_oid, rados_completion, &op,
&m_header_bl);
ceph_assert(r == 0);
rados_completion->release();
}
template <typename I>
void RenameRequest<I>::send_write_destination_header() {
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
ldout(cct, 5) << this << " " << __func__ << dendl;
m_state = STATE_WRITE_DEST_HEADER;
librados::ObjectWriteOperation op;
op.create(true);
op.write_full(m_header_bl);
librados::AioCompletion *rados_completion = this->create_callback_completion();
int r = image_ctx.md_ctx.aio_operate(m_dest_oid, rados_completion, &op);
ceph_assert(r == 0);
rados_completion->release();
}
template <typename I>
void RenameRequest<I>::send_update_directory() {
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
ldout(cct, 5) << this << " " << __func__ << dendl;
m_state = STATE_UPDATE_DIRECTORY;
librados::ObjectWriteOperation op;
if (image_ctx.old_format) {
bufferlist cmd_bl;
bufferlist empty_bl;
encode(static_cast<__u8>(CEPH_OSD_TMAP_SET), cmd_bl);
encode(m_dest_name, cmd_bl);
encode(empty_bl, cmd_bl);
encode(static_cast<__u8>(CEPH_OSD_TMAP_RM), cmd_bl);
encode(image_ctx.name, cmd_bl);
op.tmap_update(cmd_bl);
} else {
cls_client::dir_rename_image(&op, image_ctx.name, m_dest_name,
image_ctx.id);
}
librados::AioCompletion *rados_completion = this->create_callback_completion();
int r = image_ctx.md_ctx.aio_operate(RBD_DIRECTORY, rados_completion, &op);
ceph_assert(r == 0);
rados_completion->release();
}
template <typename I>
void RenameRequest<I>::send_remove_source_header() {
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
ldout(cct, 5) << this << " " << __func__ << dendl;
m_state = STATE_REMOVE_SOURCE_HEADER;
librados::ObjectWriteOperation op;
op.remove();
librados::AioCompletion *rados_completion = this->create_callback_completion();
int r = image_ctx.md_ctx.aio_operate(m_source_oid, rados_completion, &op);
ceph_assert(r == 0);
rados_completion->release();
}
template <typename I>
void RenameRequest<I>::apply() {
I &image_ctx = this->m_image_ctx;
image_ctx.set_image_name(m_dest_name);
}
} // namespace operation
} // namespace librbd
template class librbd::operation::RenameRequest<librbd::ImageCtx>;
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