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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include <mutex>
#include <vector>
#include "common/ceph_context.h"
#include "common/debug.h"
#include "common/errno.h"
#include "mon/MonClient.h"
#include "ClusterWatcher.h"
#include "ServiceDaemon.h"
#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_cephfs_mirror
#undef dout_prefix
#define dout_prefix *_dout << "cephfs::mirror::ClusterWatcher " << __func__
namespace cephfs {
namespace mirror {
ClusterWatcher::ClusterWatcher(CephContext *cct, MonClient *monc, ServiceDaemon *service_daemon,
Listener &listener)
: Dispatcher(cct),
m_monc(monc),
m_service_daemon(service_daemon),
m_listener(listener) {
}
ClusterWatcher::~ClusterWatcher() {
}
bool ClusterWatcher::ms_can_fast_dispatch2(const cref_t<Message> &m) const {
return m->get_type() == CEPH_MSG_FS_MAP;
}
void ClusterWatcher::ms_fast_dispatch2(const ref_t<Message> &m) {
bool handled = ms_dispatch2(m);
ceph_assert(handled);
}
bool ClusterWatcher::ms_dispatch2(const ref_t<Message> &m) {
if (m->get_type() == CEPH_MSG_FS_MAP) {
if (m->get_connection()->get_peer_type() == CEPH_ENTITY_TYPE_MON) {
handle_fsmap(ref_cast<MFSMap>(m));
}
return true;
}
return false;
}
int ClusterWatcher::init() {
dout(20) << dendl;
bool sub = m_monc->sub_want("fsmap", 0, 0);
if (!sub) {
derr << ": failed subscribing to FSMap" << dendl;
return -1;
}
m_monc->renew_subs();
dout(10) << ": subscribed to FSMap" << dendl;
return 0;
}
void ClusterWatcher::shutdown() {
dout(20) << dendl;
std::scoped_lock locker(m_lock);
m_stopping = true;
m_monc->sub_unwant("fsmap");
}
void ClusterWatcher::handle_fsmap(const cref_t<MFSMap> &m) {
dout(20) << dendl;
auto fsmap = m->get_fsmap();
auto filesystems = fsmap.get_filesystems();
std::vector<Filesystem> mirroring_enabled;
std::vector<Filesystem> mirroring_disabled;
std::map<Filesystem, Peers> peers_added;
std::map<Filesystem, Peers> peers_removed;
std::map<Filesystem, uint64_t> fs_metadata_pools;
{
std::scoped_lock locker(m_lock);
if (m_stopping) {
return;
}
// deleted filesystems are considered mirroring disabled
for (auto it = m_filesystem_peers.begin(); it != m_filesystem_peers.end();) {
if (!fsmap.filesystem_exists(it->first.fscid)) {
mirroring_disabled.emplace_back(it->first);
it = m_filesystem_peers.erase(it);
continue;
}
++it;
}
for (auto &filesystem : filesystems) {
auto fs = Filesystem{filesystem->fscid,
std::string(filesystem->mds_map.get_fs_name())};
auto pool_id = filesystem->mds_map.get_metadata_pool();
auto &mirror_info = filesystem->mirror_info;
if (!mirror_info.is_mirrored()) {
auto it = m_filesystem_peers.find(fs);
if (it != m_filesystem_peers.end()) {
mirroring_disabled.emplace_back(fs);
m_filesystem_peers.erase(it);
}
} else {
auto [fspeersit, enabled] = m_filesystem_peers.emplace(fs, Peers{});
auto &peers = fspeersit->second;
if (enabled) {
mirroring_enabled.emplace_back(fs);
fs_metadata_pools.emplace(fs, pool_id);
}
// peers added
Peers added;
std::set_difference(mirror_info.peers.begin(), mirror_info.peers.end(),
peers.begin(), peers.end(), std::inserter(added, added.end()));
// peers removed
Peers removed;
std::set_difference(peers.begin(), peers.end(),
mirror_info.peers.begin(), mirror_info.peers.end(),
std::inserter(removed, removed.end()));
// update set
if (!added.empty()) {
peers_added.emplace(fs, added);
peers.insert(added.begin(), added.end());
}
if (!removed.empty()) {
peers_removed.emplace(fs, removed);
for (auto &p : removed) {
peers.erase(p);
}
}
}
}
}
dout(5) << ": mirroring enabled=" << mirroring_enabled << ", mirroring_disabled="
<< mirroring_disabled << dendl;
for (auto &fs : mirroring_enabled) {
m_service_daemon->add_filesystem(fs.fscid, fs.fs_name);
m_listener.handle_mirroring_enabled(FilesystemSpec(fs, fs_metadata_pools.at(fs)));
}
for (auto &fs : mirroring_disabled) {
m_service_daemon->remove_filesystem(fs.fscid);
m_listener.handle_mirroring_disabled(fs);
}
dout(5) << ": peers added=" << peers_added << ", peers removed=" << peers_removed << dendl;
for (auto &[fs, peers] : peers_added) {
for (auto &peer : peers) {
m_service_daemon->add_peer(fs.fscid, peer);
m_listener.handle_peers_added(fs, peer);
}
}
for (auto &[fs, peers] : peers_removed) {
for (auto &peer : peers) {
m_service_daemon->remove_peer(fs.fscid, peer);
m_listener.handle_peers_removed(fs, peer);
}
}
std::scoped_lock locker(m_lock);
if (!m_stopping) {
m_monc->sub_got("fsmap", fsmap.get_epoch());
} // else we have already done a sub_unwant()
}
} // namespace mirror
} // namespace cephfs
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