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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "SyncPointPruneRequest.h"
#include "common/debug.h"
#include "common/errno.h"
#include "journal/Journaler.h"
#include "librbd/ImageCtx.h"
#include "librbd/ImageState.h"
#include "librbd/Operations.h"
#include "librbd/Utils.h"
#include <set>
#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_rbd_mirror
#undef dout_prefix
#define dout_prefix *_dout << "rbd::mirror::image_sync::SyncPointPruneRequest: " \
<< this << " " << __func__
namespace rbd {
namespace mirror {
namespace image_sync {
using librbd::util::create_context_callback;
template <typename I>
SyncPointPruneRequest<I>::SyncPointPruneRequest(I *remote_image_ctx,
bool sync_complete,
Journaler *journaler,
MirrorPeerClientMeta *client_meta,
Context *on_finish)
: m_remote_image_ctx(remote_image_ctx), m_sync_complete(sync_complete),
m_journaler(journaler), m_client_meta(client_meta), m_on_finish(on_finish),
m_client_meta_copy(*client_meta) {
}
template <typename I>
void SyncPointPruneRequest<I>::send() {
if (m_client_meta->sync_points.empty()) {
send_remove_snap();
return;
}
if (m_sync_complete) {
// if sync is complete, we can remove the master sync point
auto it = m_client_meta_copy.sync_points.begin();
MirrorPeerSyncPoint &sync_point = *it;
++it;
if (it == m_client_meta_copy.sync_points.end() ||
it->from_snap_name != sync_point.snap_name) {
m_snap_names.push_back(sync_point.snap_name);
}
if (!sync_point.from_snap_name.empty()) {
m_snap_names.push_back(sync_point.from_snap_name);
}
} else {
// if we have more than one sync point or invalid sync points,
// trim them off
RWLock::RLocker snap_locker(m_remote_image_ctx->snap_lock);
std::set<std::string> snap_names;
for (auto it = m_client_meta_copy.sync_points.rbegin();
it != m_client_meta_copy.sync_points.rend(); ++it) {
MirrorPeerSyncPoint &sync_point = *it;
if (&sync_point == &m_client_meta_copy.sync_points.front()) {
if (m_remote_image_ctx->get_snap_id(
cls::rbd::UserSnapshotNamespace(), sync_point.snap_name) ==
CEPH_NOSNAP) {
derr << ": failed to locate sync point snapshot: "
<< sync_point.snap_name << dendl;
} else if (!sync_point.from_snap_name.empty()) {
derr << ": unexpected from_snap_name in primary sync point: "
<< sync_point.from_snap_name << dendl;
} else {
// first sync point is OK -- keep it
break;
}
m_invalid_master_sync_point = true;
}
if (snap_names.count(sync_point.snap_name) == 0) {
snap_names.insert(sync_point.snap_name);
m_snap_names.push_back(sync_point.snap_name);
}
MirrorPeerSyncPoint &front_sync_point =
m_client_meta_copy.sync_points.front();
if (!sync_point.from_snap_name.empty() &&
snap_names.count(sync_point.from_snap_name) == 0 &&
sync_point.from_snap_name != front_sync_point.snap_name) {
snap_names.insert(sync_point.from_snap_name);
m_snap_names.push_back(sync_point.from_snap_name);
}
}
}
send_remove_snap();
}
template <typename I>
void SyncPointPruneRequest<I>::send_remove_snap() {
if (m_snap_names.empty()) {
send_refresh_image();
return;
}
const std::string &snap_name = m_snap_names.front();
dout(20) << ": snap_name=" << snap_name << dendl;
Context *ctx = create_context_callback<
SyncPointPruneRequest<I>, &SyncPointPruneRequest<I>::handle_remove_snap>(
this);
m_remote_image_ctx->operations->snap_remove(cls::rbd::UserSnapshotNamespace(),
snap_name.c_str(),
ctx);
}
template <typename I>
void SyncPointPruneRequest<I>::handle_remove_snap(int r) {
dout(20) << ": r=" << r << dendl;
ceph_assert(!m_snap_names.empty());
std::string snap_name = m_snap_names.front();
m_snap_names.pop_front();
if (r == -ENOENT) {
r = 0;
}
if (r < 0) {
derr << ": failed to remove snapshot '" << snap_name << "': "
<< cpp_strerror(r) << dendl;
finish(r);
return;
}
send_remove_snap();
}
template <typename I>
void SyncPointPruneRequest<I>::send_refresh_image() {
dout(20) << dendl;
Context *ctx = create_context_callback<
SyncPointPruneRequest<I>, &SyncPointPruneRequest<I>::handle_refresh_image>(
this);
m_remote_image_ctx->state->refresh(ctx);
}
template <typename I>
void SyncPointPruneRequest<I>::handle_refresh_image(int r) {
dout(20) << ": r=" << r << dendl;
if (r < 0) {
derr << ": remote image refresh failed: " << cpp_strerror(r) << dendl;
finish(r);
return;
}
send_update_client();
}
template <typename I>
void SyncPointPruneRequest<I>::send_update_client() {
dout(20) << dendl;
if (m_sync_complete) {
m_client_meta_copy.sync_points.pop_front();
if (m_client_meta_copy.sync_points.empty()) {
m_client_meta_copy.state = librbd::journal::MIRROR_PEER_STATE_REPLAYING;
}
} else {
while (m_client_meta_copy.sync_points.size() > 1) {
m_client_meta_copy.sync_points.pop_back();
}
if (m_invalid_master_sync_point) {
// all subsequent sync points would have been pruned
m_client_meta_copy.sync_points.clear();
}
}
bufferlist client_data_bl;
librbd::journal::ClientData client_data(m_client_meta_copy);
encode(client_data, client_data_bl);
Context *ctx = create_context_callback<
SyncPointPruneRequest<I>, &SyncPointPruneRequest<I>::handle_update_client>(
this);
m_journaler->update_client(client_data_bl, ctx);
}
template <typename I>
void SyncPointPruneRequest<I>::handle_update_client(int r) {
dout(20) << ": r=" << r << dendl;
if (r < 0) {
derr << ": failed to update client data: " << cpp_strerror(r)
<< dendl;
finish(r);
return;
}
// update provided meta structure to reflect reality
*m_client_meta = m_client_meta_copy;
finish(0);
}
template <typename I>
void SyncPointPruneRequest<I>::finish(int r) {
dout(20) << ": r=" << r << dendl;
m_on_finish->complete(r);
delete this;
}
} // namespace image_sync
} // namespace mirror
} // namespace rbd
template class rbd::mirror::image_sync::SyncPointPruneRequest<librbd::ImageCtx>;
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