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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 "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,
SyncPointHandler* sync_point_handler,
Context *on_finish)
: m_remote_image_ctx(remote_image_ctx),
m_sync_complete(sync_complete),
m_sync_point_handler(sync_point_handler),
m_on_finish(on_finish) {
m_sync_points_copy = m_sync_point_handler->get_sync_points();
}
template <typename I>
void SyncPointPruneRequest<I>::send() {
if (m_sync_points_copy.empty()) {
send_remove_snap();
return;
}
if (m_sync_complete) {
// if sync is complete, we can remove the master sync point
auto it = m_sync_points_copy.begin();
auto& sync_point = *it;
++it;
if (it == m_sync_points_copy.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
std::shared_lock image_locker{m_remote_image_ctx->image_lock};
std::set<std::string> snap_names;
for (auto it = m_sync_points_copy.rbegin();
it != m_sync_points_copy.rend(); ++it) {
auto& sync_point = *it;
if (&sync_point == &m_sync_points_copy.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);
}
auto& front_sync_point = m_sync_points_copy.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_sync_points();
}
template <typename I>
void SyncPointPruneRequest<I>::send_update_sync_points() {
dout(20) << dendl;
if (m_sync_complete) {
m_sync_points_copy.pop_front();
} else {
while (m_sync_points_copy.size() > 1) {
m_sync_points_copy.pop_back();
}
if (m_invalid_master_sync_point) {
// all subsequent sync points would have been pruned
m_sync_points_copy.clear();
}
}
auto ctx = create_context_callback<
SyncPointPruneRequest<I>,
&SyncPointPruneRequest<I>::handle_update_sync_points>(this);
m_sync_point_handler->update_sync_points(
m_sync_point_handler->get_snap_seqs(), m_sync_points_copy,
m_sync_complete, ctx);
}
template <typename I>
void SyncPointPruneRequest<I>::handle_update_sync_points(int r) {
dout(20) << ": r=" << r << dendl;
if (r < 0) {
derr << ": failed to update client data: " << cpp_strerror(r)
<< dendl;
finish(r);
return;
}
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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