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Diffstat (limited to 'src/mds/Server.cc')
| -rw-r--r-- | src/mds/Server.cc | 10206 |
1 files changed, 10206 insertions, 0 deletions
diff --git a/src/mds/Server.cc b/src/mds/Server.cc new file mode 100644 index 00000000..5d0be194 --- /dev/null +++ b/src/mds/Server.cc @@ -0,0 +1,10206 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab +/* + * Ceph - scalable distributed file system + * + * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net> + * + * This is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License version 2.1, as published by the Free Software + * Foundation. See file COPYING. + * + */ + +#include <boost/lexical_cast.hpp> +#include "include/ceph_assert.h" // lexical_cast includes system assert.h + +#include <boost/config/warning_disable.hpp> +#include <boost/fusion/include/std_pair.hpp> +#include <boost/range/adaptor/reversed.hpp> + +#include "MDSRank.h" +#include "Server.h" +#include "Locker.h" +#include "MDCache.h" +#include "MDLog.h" +#include "Migrator.h" +#include "MDBalancer.h" +#include "InoTable.h" +#include "SnapClient.h" +#include "Mutation.h" +#include "cephfs_features.h" + +#include "msg/Messenger.h" + +#include "osdc/Objecter.h" + +#include "events/EUpdate.h" +#include "events/ESlaveUpdate.h" +#include "events/ESession.h" +#include "events/EOpen.h" +#include "events/ECommitted.h" + +#include "include/stringify.h" +#include "include/filepath.h" +#include "common/errno.h" +#include "common/Timer.h" +#include "common/perf_counters.h" +#include "include/compat.h" +#include "osd/OSDMap.h" + +#include <errno.h> +#include <math.h> + +#include <list> +#include <iostream> +#include <string_view> + +#include "common/config.h" + +#define dout_context g_ceph_context +#define dout_subsys ceph_subsys_mds +#undef dout_prefix +#define dout_prefix *_dout << "mds." << mds->get_nodeid() << ".server " + +class ServerContext : public MDSContext { + protected: + Server *server; + MDSRank *get_mds() override + { + return server->mds; + } + + public: + explicit ServerContext(Server *s) : server(s) { + ceph_assert(server != NULL); + } +}; + +class ServerLogContext : public MDSLogContextBase { +protected: + Server *server; + MDSRank *get_mds() override + { + return server->mds; + } + + MDRequestRef mdr; + void pre_finish(int r) override { + if (mdr) + mdr->mark_event("journal_committed: "); + } +public: + explicit ServerLogContext(Server *s) : server(s) { + ceph_assert(server != NULL); + } + explicit ServerLogContext(Server *s, MDRequestRef& r) : server(s), mdr(r) { + ceph_assert(server != NULL); + } +}; + +void Server::create_logger() +{ + PerfCountersBuilder plb(g_ceph_context, "mds_server", l_mdss_first, l_mdss_last); + + plb.add_u64_counter(l_mdss_handle_client_request, "handle_client_request", + "Client requests", "hcr", PerfCountersBuilder::PRIO_INTERESTING); + plb.add_u64_counter(l_mdss_handle_slave_request, "handle_slave_request", + "Slave requests", "hsr", PerfCountersBuilder::PRIO_INTERESTING); + plb.add_u64_counter(l_mdss_handle_client_session, + "handle_client_session", "Client session messages", "hcs", + PerfCountersBuilder::PRIO_INTERESTING); + plb.add_u64_counter(l_mdss_cap_revoke_eviction, "cap_revoke_eviction", + "Cap Revoke Client Eviction", "cre", PerfCountersBuilder::PRIO_INTERESTING); + plb.add_u64_counter(l_mdss_cap_acquisition_throttle, + "cap_acquisition_throttle", "Cap acquisition throttle counter", "cat", + PerfCountersBuilder::PRIO_INTERESTING); + + // fop latencies are useful + plb.set_prio_default(PerfCountersBuilder::PRIO_USEFUL); + plb.add_time_avg(l_mdss_req_lookuphash_latency, "req_lookuphash_latency", + "Request type lookup hash of inode latency"); + plb.add_time_avg(l_mdss_req_lookupino_latency, "req_lookupino_latency", + "Request type lookup inode latency"); + plb.add_time_avg(l_mdss_req_lookupparent_latency, "req_lookupparent_latency", + "Request type lookup parent latency"); + plb.add_time_avg(l_mdss_req_lookupname_latency, "req_lookupname_latency", + "Request type lookup name latency"); + plb.add_time_avg(l_mdss_req_lookup_latency, "req_lookup_latency", + "Request type lookup latency"); + plb.add_time_avg(l_mdss_req_lookupsnap_latency, "req_lookupsnap_latency", + "Request type lookup snapshot latency"); + plb.add_time_avg(l_mdss_req_getattr_latency, "req_getattr_latency", + "Request type get attribute latency"); + plb.add_time_avg(l_mdss_req_setattr_latency, "req_setattr_latency", + "Request type set attribute latency"); + plb.add_time_avg(l_mdss_req_setlayout_latency, "req_setlayout_latency", + "Request type set file layout latency"); + plb.add_time_avg(l_mdss_req_setdirlayout_latency, "req_setdirlayout_latency", + "Request type set directory layout latency"); + plb.add_time_avg(l_mdss_req_setxattr_latency, "req_setxattr_latency", + "Request type set extended attribute latency"); + plb.add_time_avg(l_mdss_req_rmxattr_latency, "req_rmxattr_latency", + "Request type remove extended attribute latency"); + plb.add_time_avg(l_mdss_req_readdir_latency, "req_readdir_latency", + "Request type read directory latency"); + plb.add_time_avg(l_mdss_req_setfilelock_latency, "req_setfilelock_latency", + "Request type set file lock latency"); + plb.add_time_avg(l_mdss_req_getfilelock_latency, "req_getfilelock_latency", + "Request type get file lock latency"); + plb.add_time_avg(l_mdss_req_create_latency, "req_create_latency", + "Request type create latency"); + plb.add_time_avg(l_mdss_req_open_latency, "req_open_latency", + "Request type open latency"); + plb.add_time_avg(l_mdss_req_mknod_latency, "req_mknod_latency", + "Request type make node latency"); + plb.add_time_avg(l_mdss_req_link_latency, "req_link_latency", + "Request type link latency"); + plb.add_time_avg(l_mdss_req_unlink_latency, "req_unlink_latency", + "Request type unlink latency"); + plb.add_time_avg(l_mdss_req_rmdir_latency, "req_rmdir_latency", + "Request type remove directory latency"); + plb.add_time_avg(l_mdss_req_rename_latency, "req_rename_latency", + "Request type rename latency"); + plb.add_time_avg(l_mdss_req_mkdir_latency, "req_mkdir_latency", + "Request type make directory latency"); + plb.add_time_avg(l_mdss_req_symlink_latency, "req_symlink_latency", + "Request type symbolic link latency"); + plb.add_time_avg(l_mdss_req_lssnap_latency, "req_lssnap_latency", + "Request type list snapshot latency"); + plb.add_time_avg(l_mdss_req_mksnap_latency, "req_mksnap_latency", + "Request type make snapshot latency"); + plb.add_time_avg(l_mdss_req_rmsnap_latency, "req_rmsnap_latency", + "Request type remove snapshot latency"); + plb.add_time_avg(l_mdss_req_renamesnap_latency, "req_renamesnap_latency", + "Request type rename snapshot latency"); + + plb.set_prio_default(PerfCountersBuilder::PRIO_DEBUGONLY); + plb.add_u64_counter(l_mdss_dispatch_client_request, "dispatch_client_request", + "Client requests dispatched"); + plb.add_u64_counter(l_mdss_dispatch_slave_request, "dispatch_server_request", + "Server requests dispatched"); + + logger = plb.create_perf_counters(); + g_ceph_context->get_perfcounters_collection()->add(logger); +} + +Server::Server(MDSRank *m) : + mds(m), + mdcache(mds->mdcache), mdlog(mds->mdlog), + logger(0), + is_full(false), + reconnect_done(NULL), + failed_reconnects(0), + reconnect_evicting(false), + terminating_sessions(false), + recall_throttle(g_conf().get_val<double>("mds_recall_max_decay_rate")) +{ + max_snaps_per_dir = g_conf().get_val<uint64_t>("mds_max_snaps_per_dir"); + replay_unsafe_with_closed_session = g_conf().get_val<bool>("mds_replay_unsafe_with_closed_session"); + cap_revoke_eviction_timeout = g_conf().get_val<double>("mds_cap_revoke_eviction_timeout"); + max_caps_per_client = g_conf().get_val<uint64_t>("mds_max_caps_per_client"); + cap_acquisition_throttle = g_conf().get_val<uint64_t>("mds_session_cap_acquisition_throttle"); + max_caps_throttle_ratio = g_conf().get_val<double>("mds_session_max_caps_throttle_ratio"); + caps_throttle_retry_request_timeout = g_conf().get_val<double>("mds_cap_acquisition_throttle_retry_request_timeout"); + supported_features = feature_bitset_t(CEPHFS_FEATURES_MDS_SUPPORTED); +} + +void Server::dispatch(const Message::const_ref &m) +{ + switch (m->get_type()) { + case CEPH_MSG_CLIENT_RECONNECT: + handle_client_reconnect(MClientReconnect::msgref_cast(m)); + return; + } + +/* + *In reconnect phase, client sent unsafe requests to mds before reconnect msg. Seting sessionclosed_isok will handle scenario like this: + +1. In reconnect phase, client sent unsafe requests to mds. +2. It reached reconnect timeout. All sessions without sending reconnect msg in time, some of which may had sent unsafe requests, are marked as closed. +(Another situation is #31668, which will deny all client reconnect msg to speed up reboot). +3.So these unsafe request from session without sending reconnect msg in time or being denied could be handled in clientreplay phase. + +*/ + bool sessionclosed_isok = replay_unsafe_with_closed_session; + // active? + // handle_slave_request()/handle_client_session() will wait if necessary + if (m->get_type() == CEPH_MSG_CLIENT_REQUEST && !mds->is_active()) { + const auto &req = MClientRequest::msgref_cast(m); + if (mds->is_reconnect() || mds->get_want_state() == CEPH_MDS_STATE_RECONNECT) { + Session *session = mds->get_session(req); + if (!session || (!session->is_open() && !sessionclosed_isok)) { + dout(5) << "session is closed, dropping " << req->get_reqid() << dendl; + return; + } + bool queue_replay = false; + if (req->is_replay()) { + dout(3) << "queuing replayed op" << dendl; + queue_replay = true; + if (req->head.ino && + !session->have_completed_request(req->get_reqid().tid, nullptr)) { + mdcache->add_replay_ino_alloc(inodeno_t(req->head.ino)); + } + } else if (req->get_retry_attempt()) { + // process completed request in clientreplay stage. The completed request + // might have created new file/directorie. This guarantees MDS sends a reply + // to client before other request modifies the new file/directorie. + if (session->have_completed_request(req->get_reqid().tid, NULL)) { + dout(3) << "queuing completed op" << dendl; + queue_replay = true; + } + // this request was created before the cap reconnect message, drop any embedded + // cap releases. + req->releases.clear(); + } + if (queue_replay) { + req->mark_queued_for_replay(); + mds->enqueue_replay(new C_MDS_RetryMessage(mds, m)); + return; + } + } + + bool wait_for_active = true; + if (mds->is_stopping()) { + wait_for_active = false; + } else if (mds->is_clientreplay()) { + if (req->is_queued_for_replay()) { + wait_for_active = false; + } + } + if (wait_for_active) { + dout(3) << "not active yet, waiting" << dendl; + mds->wait_for_active(new C_MDS_RetryMessage(mds, m)); + return; + } + } + + switch (m->get_type()) { + case CEPH_MSG_CLIENT_SESSION: + handle_client_session(MClientSession::msgref_cast(m)); + return; + case CEPH_MSG_CLIENT_REQUEST: + handle_client_request(MClientRequest::msgref_cast(m)); + return; + case CEPH_MSG_CLIENT_RECLAIM: + handle_client_reclaim(MClientReclaim::msgref_cast(m)); + return; + case MSG_MDS_SLAVE_REQUEST: + handle_slave_request(MMDSSlaveRequest::msgref_cast(m)); + return; + default: + derr << "server unknown message " << m->get_type() << dendl; + ceph_abort_msg("server unknown message"); + } +} + + + +// ---------------------------------------------------------- +// SESSION management + +class C_MDS_session_finish : public ServerLogContext { + Session *session; + uint64_t state_seq; + bool open; + version_t cmapv; + interval_set<inodeno_t> inos; + version_t inotablev; + Context *fin; +public: + C_MDS_session_finish(Server *srv, Session *se, uint64_t sseq, bool s, version_t mv, Context *fin_ = NULL) : + ServerLogContext(srv), session(se), state_seq(sseq), open(s), cmapv(mv), inotablev(0), fin(fin_) { } + C_MDS_session_finish(Server *srv, Session *se, uint64_t sseq, bool s, version_t mv, interval_set<inodeno_t>& i, version_t iv, Context *fin_ = NULL) : + ServerLogContext(srv), session(se), state_seq(sseq), open(s), cmapv(mv), inos(i), inotablev(iv), fin(fin_) { } + void finish(int r) override { + ceph_assert(r == 0); + server->_session_logged(session, state_seq, open, cmapv, inos, inotablev); + if (fin) { + fin->complete(r); + } + } +}; + +Session* Server::find_session_by_uuid(std::string_view uuid) +{ + Session* session = nullptr; + for (auto& it : mds->sessionmap.get_sessions()) { + auto& metadata = it.second->info.client_metadata; + + auto p = metadata.find("uuid"); + if (p == metadata.end() || p->second != uuid) + continue; + + if (!session) { + session = it.second; + } else if (!session->reclaiming_from) { + assert(it.second->reclaiming_from == session); + session = it.second; + } else { + assert(session->reclaiming_from == it.second); + } + } + return session; +} + +void Server::reclaim_session(Session *session, const MClientReclaim::const_ref &m) +{ + if (!session->is_open() && !session->is_stale()) { + dout(10) << "session not open, dropping this req" << dendl; + return; + } + + auto reply = MClientReclaimReply::create(0); + if (m->get_uuid().empty()) { + dout(10) << __func__ << " invalid message (no uuid)" << dendl; + reply->set_result(-EINVAL); + mds->send_message_client(reply, session); + return; + } + + unsigned flags = m->get_flags(); + if (flags != CEPH_RECLAIM_RESET) { // currently only support reset + dout(10) << __func__ << " unsupported flags" << dendl; + reply->set_result(-EOPNOTSUPP); + mds->send_message_client(reply, session); + return; + } + + Session* target = find_session_by_uuid(m->get_uuid()); + if (target) { + if (session->info.auth_name != target->info.auth_name) { + dout(10) << __func__ << " session auth_name " << session->info.auth_name + << " != target auth_name " << target->info.auth_name << dendl; + reply->set_result(-EPERM); + mds->send_message_client(reply, session); + } + + assert(!target->reclaiming_from); + assert(!session->reclaiming_from); + session->reclaiming_from = target; + reply->set_addrs(entity_addrvec_t(target->info.inst.addr)); + } + + if (flags & CEPH_RECLAIM_RESET) { + finish_reclaim_session(session, reply); + return; + } + + ceph_abort(); +} + +void Server::finish_reclaim_session(Session *session, const MClientReclaimReply::ref &reply) +{ + Session *target = session->reclaiming_from; + if (target) { + session->reclaiming_from = nullptr; + + Context *send_reply; + if (reply) { + int64_t session_id = session->get_client().v; + send_reply = new FunctionContext([this, session_id, reply](int r) { + assert(mds->mds_lock.is_locked_by_me()); + Session *session = mds->sessionmap.get_session(entity_name_t::CLIENT(session_id)); + if (!session) { + return; + } + auto epoch = mds->objecter->with_osdmap([](const OSDMap &map){ return map.get_epoch(); }); + reply->set_epoch(epoch); + mds->send_message_client(reply, session); + }); + } else { + send_reply = nullptr; + } + + bool blacklisted = mds->objecter->with_osdmap([target](const OSDMap &map) { + return map.is_blacklisted(target->info.inst.addr); + }); + + if (blacklisted || !g_conf()->mds_session_blacklist_on_evict) { + kill_session(target, send_reply); + } else { + std::stringstream ss; + mds->evict_client(target->get_client().v, false, true, ss, send_reply); + } + } else if (reply) { + mds->send_message_client(reply, session); + } +} + +void Server::handle_client_reclaim(const MClientReclaim::const_ref &m) +{ + Session *session = mds->get_session(m); + dout(3) << __func__ << " " << *m << " from " << m->get_source() << dendl; + assert(m->get_source().is_client()); // should _not_ come from an mds! + + if (!session) { + dout(0) << " ignoring sessionless msg " << *m << dendl; + return; + } + + if (mds->get_state() < MDSMap::STATE_CLIENTREPLAY) { + mds->wait_for_replay(new C_MDS_RetryMessage(mds, m)); + return; + } + + if (m->get_flags() & MClientReclaim::FLAG_FINISH) { + finish_reclaim_session(session); + } else { + reclaim_session(session, m); + } +} + +void Server::handle_client_session(const MClientSession::const_ref &m) +{ + version_t pv; + Session *session = mds->get_session(m); + + dout(3) << "handle_client_session " << *m << " from " << m->get_source() << dendl; + ceph_assert(m->get_source().is_client()); // should _not_ come from an mds! + + if (!session) { + dout(0) << " ignoring sessionless msg " << *m << dendl; + auto reply = MClientSession::create(CEPH_SESSION_REJECT); + reply->metadata["error_string"] = "sessionless"; + mds->send_message(reply, m->get_connection()); + return; + } + + if (m->get_op() == CEPH_SESSION_REQUEST_RENEWCAPS) { + // always handle renewcaps (state >= MDSMap::STATE_RECONNECT) + } else if (m->get_op() == CEPH_SESSION_REQUEST_CLOSE) { + // close requests need to be handled when mds is active + if (mds->get_state() < MDSMap::STATE_ACTIVE) { + mds->wait_for_active(new C_MDS_RetryMessage(mds, m)); + return; + } + } else { + if (mds->get_state() < MDSMap::STATE_CLIENTREPLAY) { + mds->wait_for_replay(new C_MDS_RetryMessage(mds, m)); + return; + } + } + + if (logger) + logger->inc(l_mdss_handle_client_session); + + uint64_t sseq = 0; + switch (m->get_op()) { + case CEPH_SESSION_REQUEST_OPEN: + if (session->is_opening() || + session->is_open() || + session->is_stale() || + session->is_killing() || + terminating_sessions) { + dout(10) << "currently open|opening|stale|killing, dropping this req" << dendl; + return; + } + ceph_assert(session->is_closed() || session->is_closing()); + + if (mds->is_stopping()) { + dout(10) << "mds is stopping, dropping open req" << dendl; + return; + } + + { + auto& addr = session->info.inst.addr; + session->set_client_metadata(client_metadata_t(m->metadata, m->supported_features)); + auto& client_metadata = session->info.client_metadata; + + auto log_session_status = [this, m, session](std::string_view status, std::string_view err) { + auto now = ceph_clock_now(); + auto throttle_elapsed = m->get_recv_complete_stamp() - m->get_throttle_stamp(); + auto elapsed = now - m->get_recv_stamp(); + CachedStackStringStream css; + *css << "New client session:" + << " addr=\"" << session->info.inst.addr << "\"" + << ",elapsed=" << elapsed + << ",throttled=" << throttle_elapsed + << ",status=\"" << status << "\""; + if (!err.empty()) { + *css << ",error=\"" << err << "\""; + } + const auto& metadata = session->info.client_metadata; + if (auto it = metadata.find("root"); it != metadata.end()) { + *css << ",root=\"" << it->second << "\""; + } + dout(2) << css->strv() << dendl; + }; + + auto send_reject_message = [this, &session, &log_session_status](std::string_view err_str) { + auto m = MClientSession::create(CEPH_SESSION_REJECT); + if (session->info.has_feature(CEPHFS_FEATURE_MIMIC)) + m->metadata["error_string"] = err_str; + mds->send_message_client(m, session); + log_session_status("REJECTED", err_str); + }; + + bool blacklisted = mds->objecter->with_osdmap( + [&addr](const OSDMap &osd_map) -> bool { + return osd_map.is_blacklisted(addr); + }); + + if (blacklisted) { + dout(10) << "rejecting blacklisted client " << addr << dendl; + send_reject_message("blacklisted"); + session->clear(); + break; + } + + if (client_metadata.features.empty()) + infer_supported_features(session, client_metadata); + + dout(20) << __func__ << " CEPH_SESSION_REQUEST_OPEN metadata entries:" << dendl; + dout(20) << " features: '" << client_metadata.features << dendl; + for (const auto& p : client_metadata) { + dout(20) << " " << p.first << ": " << p.second << dendl; + } + + feature_bitset_t missing_features = required_client_features; + missing_features -= client_metadata.features; + if (!missing_features.empty()) { + stringstream ss; + ss << "missing required features '" << missing_features << "'"; + send_reject_message(ss.str()); + mds->clog->warn() << "client session (" << session->info.inst + << ") lacks required features " << missing_features + << "; client supports " << client_metadata.features; + session->clear(); + break; + } + + // Special case for the 'root' metadata path; validate that the claimed + // root is actually within the caps of the session + if (auto it = client_metadata.find("root"); it != client_metadata.end()) { + auto claimed_root = it->second; + stringstream ss; + bool denied = false; + // claimed_root has a leading "/" which we strip before passing + // into caps check + if (claimed_root.empty() || claimed_root[0] != '/') { + denied = true; + ss << "invalue root '" << claimed_root << "'"; + } else if (!session->auth_caps.path_capable(claimed_root.substr(1))) { + denied = true; + ss << "non-allowable root '" << claimed_root << "'"; + } + + if (denied) { + // Tell the client we're rejecting their open + send_reject_message(ss.str()); + mds->clog->warn() << "client session with " << ss.str() + << " denied (" << session->info.inst << ")"; + session->clear(); + break; + } + } + + if (auto it = client_metadata.find("uuid"); it != client_metadata.end()) { + if (find_session_by_uuid(it->second)) { + send_reject_message("duplicated session uuid"); + mds->clog->warn() << "client session with duplicated session uuid '" + << it->second << "' denied (" << session->info.inst << ")"; + session->clear(); + break; + } + } + + if (session->is_closed()) + mds->sessionmap.add_session(session); + + pv = mds->sessionmap.mark_projected(session); + sseq = mds->sessionmap.set_state(session, Session::STATE_OPENING); + mds->sessionmap.touch_session(session); + auto fin = new FunctionContext([log_session_status = std::move(log_session_status)](int r){ + ceph_assert(r == 0); + log_session_status("ACCEPTED", ""); + }); + mdlog->start_submit_entry(new ESession(m->get_source_inst(), true, pv, client_metadata), + new C_MDS_session_finish(this, session, sseq, true, pv, fin)); + mdlog->flush(); + } + break; + + case CEPH_SESSION_REQUEST_RENEWCAPS: + if (session->is_open() || session->is_stale()) { + mds->sessionmap.touch_session(session); + if (session->is_stale()) { + mds->sessionmap.set_state(session, Session::STATE_OPEN); + mds->locker->resume_stale_caps(session); + mds->sessionmap.touch_session(session); + } + auto reply = MClientSession::create(CEPH_SESSION_RENEWCAPS, m->get_seq()); + mds->send_message_client(reply, session); + } else { + dout(10) << "ignoring renewcaps on non open|stale session (" << session->get_state_name() << ")" << dendl; + } + break; + + case CEPH_SESSION_REQUEST_CLOSE: + { + if (session->is_closed() || + session->is_closing() || + session->is_killing()) { + dout(10) << "already closed|closing|killing, dropping this req" << dendl; + return; + } + if (session->is_importing()) { + dout(10) << "ignoring close req on importing session" << dendl; + return; + } + ceph_assert(session->is_open() || + session->is_stale() || + session->is_opening()); + if (m->get_seq() < session->get_push_seq()) { + dout(10) << "old push seq " << m->get_seq() << " < " << session->get_push_seq() + << ", dropping" << dendl; + return; + } + // We are getting a seq that is higher than expected. + // Handle the same as any other seqn error. + // + if (m->get_seq() != session->get_push_seq()) { + dout(0) << "old push seq " << m->get_seq() << " != " << session->get_push_seq() + << ", BUGGY!" << dendl; + mds->clog->warn() << "incorrect push seq " << m->get_seq() << " != " + << session->get_push_seq() << ", dropping" << " from client : " << session->get_human_name(); + return; + } + journal_close_session(session, Session::STATE_CLOSING, NULL); + } + break; + + case CEPH_SESSION_FLUSHMSG_ACK: + finish_flush_session(session, m->get_seq()); + break; + + case CEPH_SESSION_REQUEST_FLUSH_MDLOG: + if (mds->is_active()) + mdlog->flush(); + break; + + default: + ceph_abort(); + } +} + + +void Server::flush_session(Session *session, MDSGatherBuilder& gather) { + if (!session->is_open() || + !session->get_connection() || + !session->get_connection()->has_feature(CEPH_FEATURE_EXPORT_PEER)) { + return; + } + + version_t seq = session->wait_for_flush(gather.new_sub()); + mds->send_message_client( + MClientSession::create(CEPH_SESSION_FLUSHMSG, seq), session); +} + +void Server::flush_client_sessions(set<client_t>& client_set, MDSGatherBuilder& gather) +{ + for (const auto& client : client_set) { + Session *session = mds->sessionmap.get_session(entity_name_t::CLIENT(client.v)); + ceph_assert(session); + flush_session(session, gather); + } +} + +void Server::finish_flush_session(Session *session, version_t seq) +{ + MDSContext::vec finished; + session->finish_flush(seq, finished); + mds->queue_waiters(finished); +} + +void Server::_session_logged(Session *session, uint64_t state_seq, bool open, version_t pv, + interval_set<inodeno_t>& inos, version_t piv) +{ + dout(10) << "_session_logged " << session->info.inst << " state_seq " << state_seq << " " << (open ? "open":"close") + << " " << pv << dendl; + + if (piv) { + ceph_assert(session->is_closing() || session->is_killing() || + session->is_opening()); // re-open closing session + session->info.prealloc_inos.subtract(inos); + mds->inotable->apply_release_ids(inos); + ceph_assert(mds->inotable->get_version() == piv); + } + + mds->sessionmap.mark_dirty(session); + + // apply + if (session->get_state_seq() != state_seq) { + dout(10) << " journaled state_seq " << state_seq << " != current " << session->get_state_seq() + << ", noop" << dendl; + // close must have been canceled (by an import?), or any number of other things.. + } else if (open) { + ceph_assert(session->is_opening()); + mds->sessionmap.set_state(session, Session::STATE_OPEN); + mds->sessionmap.touch_session(session); + ceph_assert(session->get_connection()); + auto reply = MClientSession::create(CEPH_SESSION_OPEN); + if (session->info.has_feature(CEPHFS_FEATURE_MIMIC)) + reply->supported_features = supported_features; + mds->send_message_client(reply, session); + if (mdcache->is_readonly()) { + auto m = MClientSession::create(CEPH_SESSION_FORCE_RO); + mds->send_message_client(m, session); + } + } else if (session->is_closing() || + session->is_killing()) { + // kill any lingering capabilities, leases, requests + bool killing = session->is_killing(); + while (!session->caps.empty()) { + Capability *cap = session->caps.front(); + CInode *in = cap->get_inode(); + dout(20) << " killing capability " << ccap_string(cap->issued()) << " on " << *in << dendl; + mds->locker->remove_client_cap(in, cap, killing); + } + while (!session->leases.empty()) { + ClientLease *r = session->leases.front(); + CDentry *dn = static_cast<CDentry*>(r->parent); + dout(20) << " killing client lease of " << *dn << dendl; + dn->remove_client_lease(r, mds->locker); + } + if (client_reconnect_gather.erase(session->info.get_client())) { + dout(20) << " removing client from reconnect set" << dendl; + if (client_reconnect_gather.empty()) { + dout(7) << " client " << session->info.inst << " was last reconnect, finishing" << dendl; + reconnect_gather_finish(); + } + } + if (client_reclaim_gather.erase(session->info.get_client())) { + dout(20) << " removing client from reclaim set" << dendl; + if (client_reclaim_gather.empty()) { + dout(7) << " client " << session->info.inst << " was last reclaimed, finishing" << dendl; + mds->maybe_clientreplay_done(); + } + } + + if (session->is_closing()) { + // mark con disposable. if there is a fault, we will get a + // reset and clean it up. if the client hasn't received the + // CLOSE message yet, they will reconnect and get an + // ms_handle_remote_reset() and realize they had in fact closed. + // do this *before* sending the message to avoid a possible + // race. + if (session->get_connection()) { + // Conditional because terminate_sessions will indiscrimately + // put sessions in CLOSING whether they ever had a conn or not. + session->get_connection()->mark_disposable(); + } + + // reset session + mds->send_message_client(MClientSession::create(CEPH_SESSION_CLOSE), session); + mds->sessionmap.set_state(session, Session::STATE_CLOSED); + session->clear(); + mds->sessionmap.remove_session(session); + } else if (session->is_killing()) { + // destroy session, close connection + if (session->get_connection()) { + session->get_connection()->mark_down(); + mds->sessionmap.set_state(session, Session::STATE_CLOSED); + session->set_connection(nullptr); + } + mds->sessionmap.remove_session(session); + } else { + ceph_abort(); + } + } else { + ceph_abort(); + } +} + +/** + * Inject sessions from some source other than actual connections. + * + * For example: + * - sessions inferred from journal replay + * - sessions learned from other MDSs during rejoin + * - sessions learned from other MDSs during dir/caps migration + * - sessions learned from other MDSs during a cross-MDS rename + */ +version_t Server::prepare_force_open_sessions(map<client_t,entity_inst_t>& cm, + map<client_t,client_metadata_t>& cmm, + map<client_t, pair<Session*,uint64_t> >& smap) +{ + version_t pv = mds->sessionmap.get_projected(); + + dout(10) << "prepare_force_open_sessions " << pv + << " on " << cm.size() << " clients" + << dendl; + + mds->objecter->with_osdmap( + [this, &cm, &cmm](const OSDMap &osd_map) { + for (auto p = cm.begin(); p != cm.end(); ) { + if (osd_map.is_blacklisted(p->second.addr)) { + dout(10) << " ignoring blacklisted client." << p->first + << " (" << p->second.addr << ")" << dendl; + cmm.erase(p->first); + cm.erase(p++); + } else { + ++p; + } + } + }); + + for (map<client_t,entity_inst_t>::iterator p = cm.begin(); p != cm.end(); ++p) { + Session *session = mds->sessionmap.get_or_add_session(p->second); + pv = mds->sessionmap.mark_projected(session); + uint64_t sseq; + if (session->is_closed() || + session->is_closing() || + session->is_killing()) { + sseq = mds->sessionmap.set_state(session, Session::STATE_OPENING); + auto q = cmm.find(p->first); + if (q != cmm.end()) + session->info.client_metadata.merge(q->second); + } else { + ceph_assert(session->is_open() || + session->is_opening() || + session->is_stale()); + sseq = 0; + } + smap[p->first] = make_pair(session, sseq); + session->inc_importing(); + } + return pv; +} + +void Server::finish_force_open_sessions(const map<client_t,pair<Session*,uint64_t> >& smap, + bool dec_import) +{ + /* + * FIXME: need to carefully consider the race conditions between a + * client trying to close a session and an MDS doing an import + * trying to force open a session... + */ + dout(10) << "finish_force_open_sessions on " << smap.size() << " clients," + << " initial v " << mds->sessionmap.get_version() << dendl; + + for (auto &it : smap) { + Session *session = it.second.first; + uint64_t sseq = it.second.second; + if (sseq > 0) { + if (session->get_state_seq() != sseq) { + dout(10) << "force_open_sessions skipping changed " << session->info.inst << dendl; + } else { + dout(10) << "force_open_sessions opened " << session->info.inst << dendl; + mds->sessionmap.set_state(session, Session::STATE_OPEN); + mds->sessionmap.touch_session(session); + + auto reply = MClientSession::create(CEPH_SESSION_OPEN); + if (session->info.has_feature(CEPHFS_FEATURE_MIMIC)) + reply->supported_features = supported_features; + mds->send_message_client(reply, session); + + if (mdcache->is_readonly()) + mds->send_message_client(MClientSession::create(CEPH_SESSION_FORCE_RO), session); + } + } else { + dout(10) << "force_open_sessions skipping already-open " << session->info.inst << dendl; + ceph_assert(session->is_open() || session->is_stale()); + } + + if (dec_import) { + session->dec_importing(); + } + + mds->sessionmap.mark_dirty(session); + } + + dout(10) << __func__ << ": final v " << mds->sessionmap.get_version() << dendl; +} + +class C_MDS_TerminatedSessions : public ServerContext { + void finish(int r) override { + server->terminating_sessions = false; + } + public: + explicit C_MDS_TerminatedSessions(Server *s) : ServerContext(s) {} +}; + +void Server::terminate_sessions() +{ + dout(5) << "terminating all sessions..." << dendl; + + terminating_sessions = true; + + // kill them off. clients will retry etc. + set<Session*> sessions; + mds->sessionmap.get_client_session_set(sessions); + for (set<Session*>::const_iterator p = sessions.begin(); + p != sessions.end(); + ++p) { + Session *session = *p; + if (session->is_closing() || + session->is_killing() || + session->is_closed()) + continue; + journal_close_session(session, Session::STATE_CLOSING, NULL); + } + + mdlog->wait_for_safe(new C_MDS_TerminatedSessions(this)); +} + + +void Server::find_idle_sessions() +{ + auto now = clock::now(); + auto last_cleared_laggy = mds->last_cleared_laggy(); + + dout(10) << "find_idle_sessions. last cleared laggy state " << last_cleared_laggy << "s ago" << dendl; + + // timeout/stale + // (caps go stale, lease die) + double queue_max_age = mds->get_dispatch_queue_max_age(ceph_clock_now()); + double cutoff = queue_max_age + mds->mdsmap->get_session_timeout(); + + // don't kick clients if we've been laggy + if (last_cleared_laggy < cutoff) { + dout(10) << " last cleared laggy " << last_cleared_laggy << "s ago (< cutoff " << cutoff + << "), not marking any client stale" << dendl; + return; + } + + std::vector<Session*> to_evict; + + bool defer_session_stale = g_conf().get_val<bool>("mds_defer_session_stale"); + const auto sessions_p1 = mds->sessionmap.by_state.find(Session::STATE_OPEN); + if (sessions_p1 != mds->sessionmap.by_state.end() && !sessions_p1->second->empty()) { + std::vector<Session*> new_stale; + + for (auto session : *(sessions_p1->second)) { + auto last_cap_renew_span = std::chrono::duration<double>(now - session->last_cap_renew).count(); + if (last_cap_renew_span < cutoff) { + dout(20) << "laggiest active session is " << session->info.inst + << " and renewed caps recently (" << last_cap_renew_span << "s ago)" << dendl; + break; + } + + if (session->last_seen > session->last_cap_renew) { + last_cap_renew_span = std::chrono::duration<double>(now - session->last_seen).count(); + if (last_cap_renew_span < cutoff) { + dout(20) << "laggiest active session is " << session->info.inst + << " and renewed caps recently (" << last_cap_renew_span << "s ago)" << dendl; + continue; + } + } + + if (last_cap_renew_span >= mds->mdsmap->get_session_autoclose()) { + dout(20) << "evicting session " << session->info.inst << " since autoclose " + "has arrived" << dendl; + // evict session without marking it stale + to_evict.push_back(session); + continue; + } + + if (defer_session_stale && + !session->is_any_flush_waiter() && + !mds->locker->is_revoking_any_caps_from(session->get_client())) { + dout(20) << "deferring marking session " << session->info.inst << " stale " + "since it holds no caps" << dendl; + continue; + } + + auto it = session->info.client_metadata.find("timeout"); + if (it != session->info.client_metadata.end()) { + unsigned timeout = strtoul(it->second.c_str(), nullptr, 0); + if (timeout == 0) { + dout(10) << "skipping session " << session->info.inst + << ", infinite timeout specified" << dendl; + continue; + } + double cutoff = queue_max_age + timeout; + if (last_cap_renew_span < cutoff) { + dout(10) << "skipping session " << session->info.inst + << ", timeout (" << timeout << ") specified" + << " and renewed caps recently (" << last_cap_renew_span << "s ago)" << dendl; + continue; + } + + // do not go through stale, evict it directly. + to_evict.push_back(session); + } else { + dout(10) << "new stale session " << session->info.inst + << " last renewed caps " << last_cap_renew_span << "s ago" << dendl; + new_stale.push_back(session); + } + } + + for (auto session : new_stale) { + mds->sessionmap.set_state(session, Session::STATE_STALE); + if (mds->locker->revoke_stale_caps(session)) { + mds->locker->remove_stale_leases(session); + finish_flush_session(session, session->get_push_seq()); + auto m = MClientSession::create(CEPH_SESSION_STALE, session->get_push_seq()); + mds->send_message_client(m, session); + } else { + to_evict.push_back(session); + } + } + } + + // autoclose + cutoff = queue_max_age + mds->mdsmap->get_session_autoclose(); + + // Collect a list of sessions exceeding the autoclose threshold + const auto sessions_p2 = mds->sessionmap.by_state.find(Session::STATE_STALE); + if (sessions_p2 != mds->sessionmap.by_state.end() && !sessions_p2->second->empty()) { + for (auto session : *(sessions_p2->second)) { + assert(session->is_stale()); + auto last_cap_renew_span = std::chrono::duration<double>(now - session->last_cap_renew).count(); + if (last_cap_renew_span < cutoff) { + dout(20) << "oldest stale session is " << session->info.inst + << " and recently renewed caps " << last_cap_renew_span << "s ago" << dendl; + break; + } + to_evict.push_back(session); + } + } + + for (auto session: to_evict) { + if (session->is_importing()) { + dout(10) << "skipping session " << session->info.inst << ", it's being imported" << dendl; + continue; + } + + auto last_cap_renew_span = std::chrono::duration<double>(now - session->last_cap_renew).count(); + mds->clog->warn() << "evicting unresponsive client " << *session + << ", after " << last_cap_renew_span << " seconds"; + dout(10) << "autoclosing stale session " << session->info.inst + << " last renewed caps " << last_cap_renew_span << "s ago" << dendl; + + if (g_conf()->mds_session_blacklist_on_timeout) { + std::stringstream ss; + mds->evict_client(session->get_client().v, false, true, ss, nullptr); + } else { + kill_session(session, NULL); + } + } +} + +void Server::evict_cap_revoke_non_responders() { + if (!cap_revoke_eviction_timeout) { + return; + } + + std::list<client_t> to_evict; + mds->locker->get_late_revoking_clients(&to_evict, cap_revoke_eviction_timeout); + + for (auto const &client: to_evict) { + mds->clog->warn() << "client id " << client << " has not responded to" + << " cap revoke by MDS for over " << cap_revoke_eviction_timeout + << " seconds, evicting"; + dout(1) << __func__ << ": evicting cap revoke non-responder client id " + << client << dendl; + + std::stringstream ss; + bool evicted = mds->evict_client(client.v, false, + g_conf()->mds_session_blacklist_on_evict, + ss, nullptr); + if (evicted && logger) { + logger->inc(l_mdss_cap_revoke_eviction); + } + } +} + +void Server::handle_conf_change(const std::set<std::string>& changed) { + if (changed.count("mds_replay_unsafe_with_closed_session")) { + replay_unsafe_with_closed_session = g_conf().get_val<bool>("mds_replay_unsafe_with_closed_session"); + } + if (changed.count("mds_cap_revoke_eviction_timeout")) { + cap_revoke_eviction_timeout = g_conf().get_val<double>("mds_cap_revoke_eviction_timeout"); + dout(20) << __func__ << " cap revoke eviction timeout changed to " + << cap_revoke_eviction_timeout << dendl; + } + if (changed.count("mds_recall_max_decay_rate")) { + recall_throttle = DecayCounter(g_conf().get_val<double>("mds_recall_max_decay_rate")); + } + if (changed.count("mds_max_snaps_per_dir")) { + max_snaps_per_dir = g_conf().get_val<uint64_t>("mds_max_snaps_per_dir"); + dout(20) << __func__ << " max snapshots per directory changed to " + << max_snaps_per_dir << dendl; + } + if (changed.count("mds_max_caps_per_client")) { + max_caps_per_client = g_conf().get_val<uint64_t>("mds_max_caps_per_client"); + } + if (changed.count("mds_session_cap_acquisition_throttle")) { + cap_acquisition_throttle = g_conf().get_val<uint64_t>("mds_session_cap_acquisition_throttle"); + } + if (changed.count("mds_session_max_caps_throttle_ratio")) { + max_caps_throttle_ratio = g_conf().get_val<double>("mds_session_max_caps_throttle_ratio"); + } + if (changed.count("mds_cap_acquisition_throttle_retry_request_timeout")) { + caps_throttle_retry_request_timeout = g_conf().get_val<double>("mds_cap_acquisition_throttle_retry_request_timeout"); + } +} + +/* + * XXX bump in the interface here, not using an MDSContext here + * because all the callers right now happen to use a SaferCond + */ +void Server::kill_session(Session *session, Context *on_safe) +{ + ceph_assert(mds->mds_lock.is_locked_by_me()); + + if ((session->is_opening() || + session->is_open() || + session->is_stale()) && + !session->is_importing()) { + dout(10) << "kill_session " << session << dendl; + journal_close_session(session, Session::STATE_KILLING, on_safe); + } else { + dout(10) << "kill_session importing or already closing/killing " << session << dendl; + if (session->is_closing() || + session->is_killing()) { + if (on_safe) + mdlog->wait_for_safe(new MDSInternalContextWrapper(mds, on_safe)); + } else { + ceph_assert(session->is_closed() || + session->is_importing()); + if (on_safe) + on_safe->complete(0); + } + } +} + +size_t Server::apply_blacklist(const std::set<entity_addr_t> &blacklist) +{ + bool prenautilus = mds->objecter->with_osdmap( + [&](const OSDMap& o) { + return o.require_osd_release < CEPH_RELEASE_NAUTILUS; + }); + + std::vector<Session*> victims; + const auto& sessions = mds->sessionmap.get_sessions(); + for (const auto& p : sessions) { + if (!p.first.is_client()) { + // Do not apply OSDMap blacklist to MDS daemons, we find out + // about their death via MDSMap. + continue; + } + + Session *s = p.second; + auto inst_addr = s->info.inst.addr; + // blacklist entries are always TYPE_ANY for nautilus+ + inst_addr.set_type(entity_addr_t::TYPE_ANY); + if (blacklist.count(inst_addr)) { + victims.push_back(s); + continue; + } + if (prenautilus) { + // ...except pre-nautilus, they were TYPE_LEGACY + inst_addr.set_type(entity_addr_t::TYPE_LEGACY); + if (blacklist.count(inst_addr)) { + victims.push_back(s); + } + } + } + + for (const auto s : victims) { + kill_session(s, nullptr); + } + + dout(10) << "apply_blacklist: killed " << victims.size() << dendl; + + return victims.size(); +} + +void Server::journal_close_session(Session *session, int state, Context *on_safe) +{ + uint64_t sseq = mds->sessionmap.set_state(session, state); + version_t pv = mds->sessionmap.mark_projected(session); + version_t piv = 0; + + // release alloc and pending-alloc inos for this session + // and wipe out session state, in case the session close aborts for some reason + interval_set<inodeno_t> both; + both.insert(session->info.prealloc_inos); + both.insert(session->pending_prealloc_inos); + if (both.size()) { + mds->inotable->project_release_ids(both); + piv = mds->inotable->get_projected_version(); + } else + piv = 0; + + mdlog->start_submit_entry(new ESession(session->info.inst, false, pv, both, piv), + new C_MDS_session_finish(this, session, sseq, false, pv, both, piv, on_safe)); + mdlog->flush(); + + // clean up requests, too + while(!session->requests.empty()) { + auto mdr = MDRequestRef(*session->requests.begin()); + mdcache->request_kill(mdr); + } + + finish_flush_session(session, session->get_push_seq()); +} + +void Server::reconnect_clients(MDSContext *reconnect_done_) +{ + reconnect_done = reconnect_done_; + + auto now = clock::now(); + set<Session*> sessions; + mds->sessionmap.get_client_session_set(sessions); + for (auto session : sessions) { + if (session->is_open()) { + client_reconnect_gather.insert(session->get_client()); + session->set_reconnecting(true); + session->last_cap_renew = now; + } + } + + if (client_reconnect_gather.empty()) { + dout(7) << "reconnect_clients -- no sessions, doing nothing." << dendl; + reconnect_gather_finish(); + return; + } + + // clients will get the mdsmap and discover we're reconnecting via the monitor. + + reconnect_start = now; + dout(1) << "reconnect_clients -- " << client_reconnect_gather.size() << " sessions" << dendl; + mds->sessionmap.dump(); +} + +void Server::handle_client_reconnect(const MClientReconnect::const_ref &m) +{ + dout(7) << "handle_client_reconnect " << m->get_source() + << (m->has_more() ? " (more)" : "") << dendl; + client_t from = m->get_source().num(); + Session *session = mds->get_session(m); + if (!session) { + dout(0) << " ignoring sessionless msg " << *m << dendl; + auto reply = MClientSession::create(CEPH_SESSION_REJECT); + reply->metadata["error_string"] = "sessionless"; + mds->send_message(reply, m->get_connection()); + return; + } + + if (!session->is_open()) { + dout(0) << " ignoring msg from not-open session" << *m << dendl; + auto reply = MClientSession::create(CEPH_SESSION_CLOSE); + mds->send_message(reply, m->get_connection()); + return; + } + + if (!mds->is_reconnect() && mds->get_want_state() == CEPH_MDS_STATE_RECONNECT) { + dout(10) << " we're almost in reconnect state (mdsmap delivery race?); waiting" << dendl; + mds->wait_for_reconnect(new C_MDS_RetryMessage(mds, m)); + return; + } + + auto delay = std::chrono::duration<double>(clock::now() - reconnect_start).count(); + dout(10) << " reconnect_start " << reconnect_start << " delay " << delay << dendl; + + bool deny = false; + if (!mds->is_reconnect() || mds->get_want_state() != CEPH_MDS_STATE_RECONNECT || reconnect_evicting) { + // XXX maybe in the future we can do better than this? + dout(1) << " no longer in reconnect state, ignoring reconnect, sending close" << dendl; + mds->clog->info() << "denied reconnect attempt (mds is " + << ceph_mds_state_name(mds->get_state()) + << ") from " << m->get_source_inst() + << " after " << delay << " (allowed interval " << g_conf()->mds_reconnect_timeout << ")"; + deny = true; + } else { + std::string error_str; + if (!session->is_open()) { + error_str = "session is closed"; + } else if (mdcache->is_readonly()) { + error_str = "mds is readonly"; + } else { + if (session->info.client_metadata.features.empty()) + infer_supported_features(session, session->info.client_metadata); + + feature_bitset_t missing_features = required_client_features; + missing_features -= session->info.client_metadata.features; + if (!missing_features.empty()) { + stringstream ss; + ss << "missing required features '" << missing_features << "'"; + error_str = ss.str(); + } + } + + if (!error_str.empty()) { + deny = true; + dout(1) << " " << error_str << ", ignoring reconnect, sending close" << dendl; + mds->clog->info() << "denied reconnect attempt from " + << m->get_source_inst() << " (" << error_str << ")"; + } + } + + if (deny) { + auto r = MClientSession::create(CEPH_SESSION_CLOSE); + mds->send_message_client(r, session); + if (session->is_open()) + kill_session(session, nullptr); + return; + } + + if (!m->has_more()) { + // notify client of success with an OPEN + auto reply = MClientSession::create(CEPH_SESSION_OPEN); + if (session->info.has_feature(CEPHFS_FEATURE_MIMIC)) + reply->supported_features = supported_features; + mds->send_message_client(reply, session); + mds->clog->debug() << "reconnect by " << session->info.inst << " after " << delay; + } + + session->last_cap_renew = clock::now(); + + // snaprealms + for (const auto &r : m->realms) { + CInode *in = mdcache->get_inode(inodeno_t(r.realm.ino)); + if (in && in->state_test(CInode::STATE_PURGING)) + continue; + if (in) { + if (in->snaprealm) { + dout(15) << "open snaprealm (w inode) on " << *in << dendl; + } else { + // this can happen if we are non-auth or we rollback snaprealm + dout(15) << "open snaprealm (null snaprealm) on " << *in << dendl; + } + mdcache->add_reconnected_snaprealm(from, inodeno_t(r.realm.ino), snapid_t(r.realm.seq)); + } else { + dout(15) << "open snaprealm (w/o inode) on " << inodeno_t(r.realm.ino) + << " seq " << r.realm.seq << dendl; + mdcache->add_reconnected_snaprealm(from, inodeno_t(r.realm.ino), snapid_t(r.realm.seq)); + } + } + + // caps + for (const auto &p : m->caps) { + // make sure our last_cap_id is MAX over all issued caps + if (p.second.capinfo.cap_id > mdcache->last_cap_id) + mdcache->last_cap_id = p.second.capinfo.cap_id; + + CInode *in = mdcache->get_inode(p.first); + if (in && in->state_test(CInode::STATE_PURGING)) + continue; + if (in && in->is_auth()) { + // we recovered it, and it's ours. take note. + dout(15) << "open cap realm " << inodeno_t(p.second.capinfo.snaprealm) + << " on " << *in << dendl; + in->reconnect_cap(from, p.second, session); + mdcache->add_reconnected_cap(from, p.first, p.second); + recover_filelocks(in, p.second.flockbl, m->get_orig_source().num()); + continue; + } + + if (in && !in->is_auth()) { + // not mine. + dout(10) << "non-auth " << *in << ", will pass off to authority" << dendl; + // add to cap export list. + mdcache->rejoin_export_caps(p.first, from, p.second, + in->authority().first, true); + } else { + // don't know if the inode is mine + dout(10) << "missing ino " << p.first << ", will load later" << dendl; + mdcache->rejoin_recovered_caps(p.first, from, p.second, MDS_RANK_NONE); + } + } + + reconnect_last_seen = clock::now(); + + if (!m->has_more()) { + mdcache->rejoin_recovered_client(session->get_client(), session->info.inst); + + // remove from gather set + client_reconnect_gather.erase(from); + session->set_reconnecting(false); + if (client_reconnect_gather.empty()) + reconnect_gather_finish(); + } +} + +void Server::infer_supported_features(Session *session, client_metadata_t& client_metadata) +{ + int supported = -1; + auto it = client_metadata.find("ceph_version"); + if (it != client_metadata.end()) { + // user space client + if (it->second.compare(0, 16, "ceph version 12.") == 0) + supported = CEPHFS_FEATURE_LUMINOUS; + else if (session->get_connection()->has_feature(CEPH_FEATURE_FS_CHANGE_ATTR)) + supported = CEPHFS_FEATURE_KRAKEN; + } else { + it = client_metadata.find("kernel_version"); + if (it != client_metadata.end()) { + // kernel client + if (session->get_connection()->has_feature(CEPH_FEATURE_NEW_OSDOP_ENCODING)) + supported = CEPHFS_FEATURE_LUMINOUS; + } + } + if (supported == -1 && + session->get_connection()->has_feature(CEPH_FEATURE_FS_FILE_LAYOUT_V2)) + supported = CEPHFS_FEATURE_JEWEL; + + if (supported >= 0) { + unsigned long value = (1UL << (supported + 1)) - 1; + client_metadata.features = feature_bitset_t(value); + dout(10) << __func__ << " got '" << client_metadata.features << "'" << dendl; + } +} + +void Server::update_required_client_features() +{ + vector<size_t> bits = CEPHFS_FEATURES_MDS_REQUIRED; + + int min_compat = mds->mdsmap->get_min_compat_client(); + if (min_compat >= CEPH_RELEASE_NAUTILUS) { + bits.push_back(CEPHFS_FEATURE_NAUTILUS); + } else if (min_compat >= CEPH_RELEASE_MIMIC) + bits.push_back(CEPHFS_FEATURE_MIMIC); + else if (min_compat >= CEPH_RELEASE_LUMINOUS) + bits.push_back(CEPHFS_FEATURE_LUMINOUS); + else if (min_compat >= CEPH_RELEASE_KRAKEN) + bits.push_back(CEPHFS_FEATURE_KRAKEN); + else if (min_compat >= CEPH_RELEASE_JEWEL) + bits.push_back(CEPHFS_FEATURE_JEWEL); + + std::sort(bits.begin(), bits.end()); + required_client_features = feature_bitset_t(bits); + dout(7) << "required_client_features: " << required_client_features << dendl; + + if (mds->get_state() >= MDSMap::STATE_RECONNECT) { + set<Session*> sessions; + mds->sessionmap.get_client_session_set(sessions); + for (auto session : sessions) { + feature_bitset_t missing_features = required_client_features; + missing_features -= session->info.client_metadata.features; + if (!missing_features.empty()) { + bool blacklisted = mds->objecter->with_osdmap( + [session](const OSDMap &osd_map) -> bool { + return osd_map.is_blacklisted(session->info.inst.addr); + }); + if (blacklisted) + continue; + + mds->clog->warn() << "evicting session " << *session << ", missing required features '" + << missing_features << "'"; + std::stringstream ss; + mds->evict_client(session->get_client().v, false, + g_conf()->mds_session_blacklist_on_evict, ss); + } + } + } +} + +void Server::reconnect_gather_finish() +{ + dout(7) << "reconnect_gather_finish. failed on " << failed_reconnects << " clients" << dendl; + ceph_assert(reconnect_done); + + if (!mds->snapclient->is_synced()) { + // make sure snaptable cache is populated. snaprealms will be + // extensively used in rejoin stage. + dout(7) << " snaptable cache isn't synced, delaying state transition" << dendl; + mds->snapclient->wait_for_sync(reconnect_done); + } else { + reconnect_done->complete(0); + } + reconnect_done = NULL; +} + +void Server::reconnect_tick() +{ + if (reconnect_evicting) { + dout(7) << "reconnect_tick: waiting for evictions" << dendl; + return; + } + + if (client_reconnect_gather.empty()) + return; + + auto now = clock::now(); + auto elapse1 = std::chrono::duration<double>(now - reconnect_start).count(); + if (elapse1 < g_conf()->mds_reconnect_timeout) + return; + + vector<Session*> remaining_sessions; + remaining_sessions.reserve(client_reconnect_gather.size()); + for (auto c : client_reconnect_gather) { + Session *session = mds->sessionmap.get_session(entity_name_t::CLIENT(c.v)); + ceph_assert(session); + remaining_sessions.push_back(session); + // client re-sends cap flush messages before the reconnect message + if (session->last_seen > reconnect_last_seen) + reconnect_last_seen = session->last_seen; + } + + auto elapse2 = std::chrono::duration<double>(now - reconnect_last_seen).count(); + if (elapse2 < g_conf()->mds_reconnect_timeout / 2) { + dout(7) << "reconnect_tick: last seen " << elapse2 + << " seconds ago, extending reconnect interval" << dendl; + return; + } + + dout(7) << "reconnect timed out, " << remaining_sessions.size() + << " clients have not reconnected in time" << dendl; + + // If we're doing blacklist evictions, use this to wait for them before + // proceeding to reconnect_gather_finish + MDSGatherBuilder gather(g_ceph_context); + + for (auto session : remaining_sessions) { + // Keep sessions that have specified timeout. These sessions will prevent + // mds from going to active. MDS goes to active after they all have been + // killed or reclaimed. + if (session->info.client_metadata.find("timeout") != + session->info.client_metadata.end()) { + dout(1) << "reconnect keeps " << session->info.inst + << ", need to be reclaimed" << dendl; + client_reclaim_gather.insert(session->get_client()); + continue; + } + + dout(1) << "reconnect gives up on " << session->info.inst << dendl; + + mds->clog->warn() << "evicting unresponsive client " << *session + << ", after waiting " << elapse1 + << " seconds during MDS startup"; + + if (g_conf()->mds_session_blacklist_on_timeout) { + std::stringstream ss; + mds->evict_client(session->get_client().v, false, true, ss, + gather.new_sub()); + } else { + kill_session(session, NULL); + } + + failed_reconnects++; + } + client_reconnect_gather.clear(); + + if (gather.has_subs()) { + dout(1) << "reconnect will complete once clients are evicted" << dendl; + gather.set_finisher(new MDSInternalContextWrapper(mds, new FunctionContext( + [this](int r){reconnect_gather_finish();}))); + gather.activate(); + reconnect_evicting = true; + } else { + reconnect_gather_finish(); + } +} + +void Server::recover_filelocks(CInode *in, bufferlist locks, int64_t client) +{ + if (!locks.length()) return; + int numlocks; + ceph_filelock lock; + auto p = locks.cbegin(); + decode(numlocks, p); + for (int i = 0; i < numlocks; ++i) { + decode(lock, p); + lock.client = client; + in->get_fcntl_lock_state()->held_locks.insert(pair<uint64_t, ceph_filelock>(lock.start, lock)); + ++in->get_fcntl_lock_state()->client_held_lock_counts[client]; + } + decode(numlocks, p); + for (int i = 0; i < numlocks; ++i) { + decode(lock, p); + lock.client = client; + in->get_flock_lock_state()->held_locks.insert(pair<uint64_t, ceph_filelock> (lock.start, lock)); + ++in->get_flock_lock_state()->client_held_lock_counts[client]; + } +} + +/** + * Call this when the MDCache is oversized, to send requests to the clients + * to trim some caps, and consequently unpin some inodes in the MDCache so + * that it can trim too. + */ +std::pair<bool, uint64_t> Server::recall_client_state(MDSGatherBuilder* gather, RecallFlags flags) +{ + const auto now = clock::now(); + const bool steady = !!(flags&RecallFlags::STEADY); + const bool enforce_max = !!(flags&RecallFlags::ENFORCE_MAX); + const bool enforce_liveness = !!(flags&RecallFlags::ENFORCE_LIVENESS); + const bool trim = !!(flags&RecallFlags::TRIM); + + const auto max_caps_per_client = g_conf().get_val<uint64_t>("mds_max_caps_per_client"); + const auto min_caps_per_client = g_conf().get_val<uint64_t>("mds_min_caps_per_client"); + const auto recall_global_max_decay_threshold = g_conf().get_val<Option::size_t>("mds_recall_global_max_decay_threshold"); + const auto recall_max_caps = g_conf().get_val<Option::size_t>("mds_recall_max_caps"); + const auto recall_max_decay_threshold = g_conf().get_val<Option::size_t>("mds_recall_max_decay_threshold"); + const auto cache_liveness_magnitude = g_conf().get_val<Option::size_t>("mds_session_cache_liveness_magnitude"); + + dout(7) << __func__ << ":" + << " min=" << min_caps_per_client + << " max=" << max_caps_per_client + << " total=" << Capability::count() + << " flags=" << flags + << dendl; + + /* trim caps of sessions with the most caps first */ + std::multimap<uint64_t, Session*> caps_session; + auto f = [&caps_session, enforce_max, enforce_liveness, trim, max_caps_per_client, cache_liveness_magnitude](auto& s) { + auto num_caps = s->caps.size(); + auto cache_liveness = s->get_session_cache_liveness(); + if (trim || (enforce_max && num_caps > max_caps_per_client) || (enforce_liveness && cache_liveness < (num_caps>>cache_liveness_magnitude))) { + caps_session.emplace(std::piecewise_construct, std::forward_as_tuple(num_caps), std::forward_as_tuple(s)); + } + }; + mds->sessionmap.get_client_sessions(std::move(f)); + + std::pair<bool, uint64_t> result = {false, 0}; + auto& [throttled, caps_recalled] = result; + last_recall_state = now; + for (const auto& [num_caps, session] : boost::adaptors::reverse(caps_session)) { + if (!session->is_open() || + !session->get_connection() || + !session->info.inst.name.is_client()) + continue; + + dout(10) << __func__ << ":" + << " session " << session->info.inst + << " caps " << num_caps + << ", leases " << session->leases.size() + << dendl; + + uint64_t newlim; + if (num_caps < recall_max_caps || (num_caps-recall_max_caps) < min_caps_per_client) { + newlim = min_caps_per_client; + } else { + newlim = num_caps-recall_max_caps; + } + if (num_caps > newlim) { + /* now limit the number of caps we recall at a time to prevent overloading ourselves */ + uint64_t recall = std::min<uint64_t>(recall_max_caps, num_caps-newlim); + newlim = num_caps-recall; + const uint64_t session_recall_throttle = session->get_recall_caps_throttle(); + const uint64_t session_recall_throttle2o = session->get_recall_caps_throttle2o(); + const uint64_t global_recall_throttle = recall_throttle.get(); + if (session_recall_throttle+recall > recall_max_decay_threshold) { + dout(15) << " session recall threshold (" << recall_max_decay_threshold << ") hit at " << session_recall_throttle << "; skipping!" << dendl; + throttled = true; + continue; + } else if (session_recall_throttle2o+recall > recall_max_caps*2) { + dout(15) << " session recall 2nd-order threshold (" << 2*recall_max_caps << ") hit at " << session_recall_throttle2o << "; skipping!" << dendl; + throttled = true; + continue; + } else if (global_recall_throttle+recall > recall_global_max_decay_threshold) { + dout(15) << " global recall threshold (" << recall_global_max_decay_threshold << ") hit at " << global_recall_throttle << "; skipping!" << dendl; + throttled = true; + break; + } + + // now check if we've recalled caps recently and the client is unlikely to satisfy a new recall + if (steady) { + const auto session_recall = session->get_recall_caps(); + const auto session_release = session->get_release_caps(); + if (2*session_release < session_recall && 2*session_recall > recall_max_decay_threshold) { + /* The session has been unable to keep up with the number of caps + * recalled (by half); additionally, to prevent marking sessions + * we've just begun to recall from, the session_recall counter + * (decayed count of caps recently recalled) is **greater** than the + * session threshold for the session's cap recall throttle. + */ + dout(15) << " 2*session_release < session_recall" + " (2*" << session_release << " < " << session_recall << ") &&" + " 2*session_recall < recall_max_decay_threshold" + " (2*" << session_recall << " > " << recall_max_decay_threshold << ")" + " Skipping because we are unlikely to get more released." << dendl; + continue; + } else if (recall < recall_max_caps && 2*recall < session_recall) { + /* The number of caps recalled is less than the number we *could* + * recall (so there isn't much left to recall?) and the number of + * caps is less than the current recall_caps counter (decayed count + * of caps recently recalled). + */ + dout(15) << " 2*recall < session_recall " + " (2*" << recall << " < " << session_recall << ") &&" + " recall < recall_max_caps (" << recall << " < " << recall_max_caps << ");" + " Skipping because we are unlikely to get more released." << dendl; + continue; + } + } + + dout(7) << " recalling " << recall << " caps; session_recall_throttle = " << session_recall_throttle << "; global_recall_throttle = " << global_recall_throttle << dendl; + + auto m = MClientSession::create(CEPH_SESSION_RECALL_STATE); + m->head.max_caps = newlim; + mds->send_message_client(m, session); + if (gather) { + flush_session(session, *gather); + } + caps_recalled += session->notify_recall_sent(newlim); + recall_throttle.hit(recall); + } + } + + dout(7) << "recalled" << (throttled ? " (throttled)" : "") << " " << caps_recalled << " client caps." << dendl; + + return result; +} + +void Server::force_clients_readonly() +{ + dout(10) << "force_clients_readonly" << dendl; + set<Session*> sessions; + mds->sessionmap.get_client_session_set(sessions); + for (set<Session*>::const_iterator p = sessions.begin(); + p != sessions.end(); + ++p) { + Session *session = *p; + if (!session->info.inst.name.is_client() || + !(session->is_open() || session->is_stale())) + continue; + mds->send_message_client(MClientSession::create(CEPH_SESSION_FORCE_RO), session); + } +} + +/******* + * some generic stuff for finishing off requests + */ +void Server::journal_and_reply(MDRequestRef& mdr, CInode *in, CDentry *dn, LogEvent *le, MDSLogContextBase *fin) +{ + dout(10) << "journal_and_reply tracei " << in << " tracedn " << dn << dendl; + ceph_assert(!mdr->has_completed); + + // note trace items for eventual reply. + mdr->tracei = in; + if (in) + mdr->pin(in); + + mdr->tracedn = dn; + if (dn) + mdr->pin(dn); + + early_reply(mdr, in, dn); + + mdr->committing = true; + submit_mdlog_entry(le, fin, mdr, __func__); + + if (mdr->client_request && mdr->client_request->is_queued_for_replay()) { + if (mds->queue_one_replay()) { + dout(10) << " queued next replay op" << dendl; + } else { + dout(10) << " journaled last replay op" << dendl; + } + } else if (mdr->did_early_reply) + mds->locker->drop_rdlocks_for_early_reply(mdr.get()); + else + mdlog->flush(); +} + +void Server::submit_mdlog_entry(LogEvent *le, MDSLogContextBase *fin, MDRequestRef& mdr, + std::string_view event) +{ + if (mdr) { + string event_str("submit entry: "); + event_str += event; + mdr->mark_event(event_str); + } + mdlog->submit_entry(le, fin); +} + +/* + * send response built from mdr contents and error code; clean up mdr + */ +void Server::respond_to_request(MDRequestRef& mdr, int r) +{ + if (mdr->client_request) { + reply_client_request(mdr, MClientReply::create(*mdr->client_request, r)); + } else if (mdr->internal_op > -1) { + dout(10) << "respond_to_request on internal request " << mdr << dendl; + if (!mdr->internal_op_finish) + ceph_abort_msg("trying to respond to internal op without finisher"); + mdr->internal_op_finish->complete(r); + mdcache->request_finish(mdr); + } +} + +// statistics mds req op number and latency +void Server::perf_gather_op_latency(const MClientRequest::const_ref &req, utime_t lat) +{ + int code = l_mdss_first; + switch(req->get_op()) { + case CEPH_MDS_OP_LOOKUPHASH: + code = l_mdss_req_lookuphash_latency; + break; + case CEPH_MDS_OP_LOOKUPINO: + code = l_mdss_req_lookupino_latency; + break; + case CEPH_MDS_OP_LOOKUPPARENT: + code = l_mdss_req_lookupparent_latency; + break; + case CEPH_MDS_OP_LOOKUPNAME: + code = l_mdss_req_lookupname_latency; + break; + case CEPH_MDS_OP_LOOKUP: + code = l_mdss_req_lookup_latency; + break; + case CEPH_MDS_OP_LOOKUPSNAP: + code = l_mdss_req_lookupsnap_latency; + break; + case CEPH_MDS_OP_GETATTR: + code = l_mdss_req_getattr_latency; + break; + case CEPH_MDS_OP_SETATTR: + code = l_mdss_req_setattr_latency; + break; + case CEPH_MDS_OP_SETLAYOUT: + code = l_mdss_req_setlayout_latency; + break; + case CEPH_MDS_OP_SETDIRLAYOUT: + code = l_mdss_req_setdirlayout_latency; + break; + case CEPH_MDS_OP_SETXATTR: + code = l_mdss_req_setxattr_latency; + break; + case CEPH_MDS_OP_RMXATTR: + code = l_mdss_req_rmxattr_latency; + break; + case CEPH_MDS_OP_READDIR: + code = l_mdss_req_readdir_latency; + break; + case CEPH_MDS_OP_SETFILELOCK: + code = l_mdss_req_setfilelock_latency; + break; + case CEPH_MDS_OP_GETFILELOCK: + code = l_mdss_req_getfilelock_latency; + break; + case CEPH_MDS_OP_CREATE: + code = l_mdss_req_create_latency; + break; + case CEPH_MDS_OP_OPEN: + code = l_mdss_req_open_latency; + break; + case CEPH_MDS_OP_MKNOD: + code = l_mdss_req_mknod_latency; + break; + case CEPH_MDS_OP_LINK: + code = l_mdss_req_link_latency; + break; + case CEPH_MDS_OP_UNLINK: + code = l_mdss_req_unlink_latency; + break; + case CEPH_MDS_OP_RMDIR: + code = l_mdss_req_rmdir_latency; + break; + case CEPH_MDS_OP_RENAME: + code = l_mdss_req_rename_latency; + break; + case CEPH_MDS_OP_MKDIR: + code = l_mdss_req_mkdir_latency; + break; + case CEPH_MDS_OP_SYMLINK: + code = l_mdss_req_symlink_latency; + break; + case CEPH_MDS_OP_LSSNAP: + code = l_mdss_req_lssnap_latency; + break; + case CEPH_MDS_OP_MKSNAP: + code = l_mdss_req_mksnap_latency; + break; + case CEPH_MDS_OP_RMSNAP: + code = l_mdss_req_rmsnap_latency; + break; + case CEPH_MDS_OP_RENAMESNAP: + code = l_mdss_req_renamesnap_latency; + break; + default: ceph_abort(); + } + logger->tinc(code, lat); +} + +void Server::early_reply(MDRequestRef& mdr, CInode *tracei, CDentry *tracedn) +{ + if (!g_conf()->mds_early_reply) + return; + + if (mdr->no_early_reply) { + dout(10) << "early_reply - flag no_early_reply is set, not allowed." << dendl; + return; + } + + if (mdr->has_more() && mdr->more()->has_journaled_slaves) { + dout(10) << "early_reply - there are journaled slaves, not allowed." << dendl; + return; + } + + if (mdr->alloc_ino) { + dout(10) << "early_reply - allocated ino, not allowed" << dendl; + return; + } + + const MClientRequest::const_ref &req = mdr->client_request; + entity_inst_t client_inst = req->get_source_inst(); + if (client_inst.name.is_mds()) + return; + + if (req->is_replay()) { + dout(10) << " no early reply on replay op" << dendl; + return; + } + + + auto reply = MClientReply::create(*req, 0); + reply->set_unsafe(); + + // mark xlocks "done", indicating that we are exposing uncommitted changes. + // + //_rename_finish() does not send dentry link/unlink message to replicas. + // so do not set xlocks on dentries "done", the xlocks prevent dentries + // that have projected linkages from getting new replica. + mds->locker->set_xlocks_done(mdr.get(), req->get_op() == CEPH_MDS_OP_RENAME); + + dout(10) << "early_reply " << reply->get_result() + << " (" << cpp_strerror(reply->get_result()) + << ") " << *req << dendl; + + if (tracei || tracedn) { + if (tracei) + mdr->cap_releases.erase(tracei->vino()); + if (tracedn) + mdr->cap_releases.erase(tracedn->get_dir()->get_inode()->vino()); + + set_trace_dist(mdr->session, reply, tracei, tracedn, mdr->snapid, + req->get_dentry_wanted(), mdr); + } + + reply->set_extra_bl(mdr->reply_extra_bl); + mds->send_message_client(reply, mdr->session); + + mdr->did_early_reply = true; + + mds->logger->inc(l_mds_reply); + utime_t lat = ceph_clock_now() - req->get_recv_stamp(); + mds->logger->tinc(l_mds_reply_latency, lat); + if (client_inst.name.is_client()) { + mds->sessionmap.hit_session(mdr->session); + } + perf_gather_op_latency(req, lat); + dout(20) << "lat " << lat << dendl; + + mdr->mark_event("early_replied"); +} + +/* + * send given reply + * include a trace to tracei + * Clean up mdr + */ +void Server::reply_client_request(MDRequestRef& mdr, const MClientReply::ref &reply) +{ + ceph_assert(mdr.get()); + const MClientRequest::const_ref &req = mdr->client_request; + + dout(7) << "reply_client_request " << reply->get_result() + << " (" << cpp_strerror(reply->get_result()) + << ") " << *req << dendl; + + mdr->mark_event("replying"); + + Session *session = mdr->session; + + // note successful request in session map? + // + // setfilelock requests are special, they only modify states in MDS memory. + // The states get lost when MDS fails. If Client re-send a completed + // setfilelock request, it means that client did not receive corresponding + // setfilelock reply. So MDS should re-execute the setfilelock request. + if (req->may_write() && req->get_op() != CEPH_MDS_OP_SETFILELOCK && + reply->get_result() == 0 && session) { + inodeno_t created = mdr->alloc_ino ? mdr->alloc_ino : mdr->used_prealloc_ino; + session->add_completed_request(mdr->reqid.tid, created); + if (mdr->ls) { + mdr->ls->touched_sessions.insert(session->info.inst.name); + } + } + + // give any preallocated inos to the session + apply_allocated_inos(mdr, session); + + // get tracei/tracedn from mdr? + snapid_t snapid = mdr->snapid; + CInode *tracei = mdr->tracei; + CDentry *tracedn = mdr->tracedn; + + bool is_replay = mdr->client_request->is_replay(); + bool did_early_reply = mdr->did_early_reply; + entity_inst_t client_inst = req->get_source_inst(); + int dentry_wanted = req->get_dentry_wanted(); + + if (!did_early_reply && !is_replay) { + + mds->logger->inc(l_mds_reply); + utime_t lat = ceph_clock_now() - mdr->client_request->get_recv_stamp(); + mds->logger->tinc(l_mds_reply_latency, lat); + if (session && client_inst.name.is_client()) { + mds->sessionmap.hit_session(session); + } + perf_gather_op_latency(req, lat); + dout(20) << "lat " << lat << dendl; + + if (tracei) + mdr->cap_releases.erase(tracei->vino()); + if (tracedn) + mdr->cap_releases.erase(tracedn->get_dir()->get_inode()->vino()); + } + + // drop non-rdlocks before replying, so that we can issue leases + mdcache->request_drop_non_rdlocks(mdr); + + // reply at all? + if (session && !client_inst.name.is_mds()) { + // send reply. + if (!did_early_reply && // don't issue leases if we sent an earlier reply already + (tracei || tracedn)) { + if (is_replay) { + if (tracei) + mdcache->try_reconnect_cap(tracei, session); + } else { + // include metadata in reply + set_trace_dist(session, reply, tracei, tracedn, + snapid, dentry_wanted, + mdr); + } + } + + // We can set the extra bl unconditionally: if it's already been sent in the + // early_reply, set_extra_bl will have claimed it and reply_extra_bl is empty + reply->set_extra_bl(mdr->reply_extra_bl); + + reply->set_mdsmap_epoch(mds->mdsmap->get_epoch()); + mds->send_message_client(reply, session); + } + + if (req->is_queued_for_replay() && + (mdr->has_completed || reply->get_result() < 0)) { + if (reply->get_result() < 0) { + int r = reply->get_result(); + derr << "reply_client_request: failed to replay " << *req + << " error " << r << " (" << cpp_strerror(r) << ")" << dendl; + mds->clog->warn() << "failed to replay " << req->get_reqid() << " error " << r; + } + mds->queue_one_replay(); + } + + // clean up request + mdcache->request_finish(mdr); + + // take a closer look at tracei, if it happens to be a remote link + if (tracei && + tracedn && + tracedn->get_projected_linkage()->is_remote()) { + mdcache->eval_remote(tracedn); + } +} + +/* + * pass inode OR dentry (not both, or we may get confused) + * + * trace is in reverse order (i.e. root inode comes last) + */ +void Server::set_trace_dist(Session *session, const MClientReply::ref &reply, + CInode *in, CDentry *dn, + snapid_t snapid, + int dentry_wanted, + MDRequestRef& mdr) +{ + // skip doing this for debugging purposes? + if (g_conf()->mds_inject_traceless_reply_probability && + mdr->ls && !mdr->o_trunc && + (rand() % 10000 < g_conf()->mds_inject_traceless_reply_probability * 10000.0)) { + dout(5) << "deliberately skipping trace for " << *reply << dendl; + return; + } + + // inode, dentry, dir, ..., inode + bufferlist bl; + mds_rank_t whoami = mds->get_nodeid(); + client_t client = session->get_client(); + utime_t now = ceph_clock_now(); + + dout(20) << "set_trace_dist snapid " << snapid << dendl; + + //assert((bool)dn == (bool)dentry_wanted); // not true for snapshot lookups + + // realm + if (snapid == CEPH_NOSNAP) { + SnapRealm *realm; + if (in) + realm = in->find_snaprealm(); + else + realm = dn->get_dir()->get_inode()->find_snaprealm(); + reply->snapbl = realm->get_snap_trace(); + dout(10) << "set_trace_dist snaprealm " << *realm << " len=" << reply->snapbl.length() << dendl; + } + + // dir + dentry? + if (dn) { + reply->head.is_dentry = 1; + CDir *dir = dn->get_dir(); + CInode *diri = dir->get_inode(); + + diri->encode_inodestat(bl, session, NULL, snapid); + dout(20) << "set_trace_dist added diri " << *diri << dendl; + +#ifdef MDS_VERIFY_FRAGSTAT + if (dir->is_complete()) + dir->verify_fragstat(); +#endif + DirStat ds; + ds.frag = dir->get_frag(); + ds.auth = dir->get_dir_auth().first; + if (dir->is_auth() && !mdcache->forward_all_reqs_to_auth()) + dir->get_dist_spec(ds.dist, whoami); + + dir->encode_dirstat(bl, session->info, ds); + dout(20) << "set_trace_dist added dir " << *dir << dendl; + + encode(dn->get_name(), bl); + if (snapid == CEPH_NOSNAP) + mds->locker->issue_client_lease(dn, client, bl, now, session); + else { + //null lease + LeaseStat e; + mds->locker->encode_lease(bl, session->info, e); + } + dout(20) << "set_trace_dist added dn " << snapid << " " << *dn << dendl; + } else + reply->head.is_dentry = 0; + + // inode + if (in) { + in->encode_inodestat(bl, session, NULL, snapid, 0, mdr->getattr_caps); + dout(20) << "set_trace_dist added in " << *in << dendl; + reply->head.is_target = 1; + } else + reply->head.is_target = 0; + + reply->set_trace(bl); +} + +void Server::handle_client_request(const MClientRequest::const_ref &req) +{ + dout(4) << "handle_client_request " << *req << dendl; + + if (mds->logger) + mds->logger->inc(l_mds_request); + if (logger) + logger->inc(l_mdss_handle_client_request); + + if (!mdcache->is_open()) { + dout(5) << "waiting for root" << dendl; + mdcache->wait_for_open(new C_MDS_RetryMessage(mds, req)); + return; + } + + bool sessionclosed_isok = replay_unsafe_with_closed_session; + // active session? + Session *session = 0; + if (req->get_source().is_client()) { + session = mds->get_session(req); + if (!session) { + dout(5) << "no session for " << req->get_source() << ", dropping" << dendl; + } else if ((session->is_closed() && (!mds->is_clientreplay() || !sessionclosed_isok)) || + session->is_closing() || + session->is_killing()) { + dout(5) << "session closed|closing|killing, dropping" << dendl; + session = NULL; + } + if (!session) { + if (req->is_queued_for_replay()) + mds->queue_one_replay(); + return; + } + } + + // old mdsmap? + if (req->get_mdsmap_epoch() < mds->mdsmap->get_epoch()) { + // send it? hrm, this isn't ideal; they may get a lot of copies if + // they have a high request rate. + } + + // completed request? + bool has_completed = false; + if (req->is_replay() || req->get_retry_attempt()) { + ceph_assert(session); + inodeno_t created; + if (session->have_completed_request(req->get_reqid().tid, &created)) { + has_completed = true; + if (!session->is_open()) + return; + // Don't send traceless reply if the completed request has created + // new inode. Treat the request as lookup request instead. + if (req->is_replay() || + ((created == inodeno_t() || !mds->is_clientreplay()) && + req->get_op() != CEPH_MDS_OP_OPEN && + req->get_op() != CEPH_MDS_OP_CREATE)) { + dout(5) << "already completed " << req->get_reqid() << dendl; + auto reply = MClientReply::create(*req, 0); + if (created != inodeno_t()) { + bufferlist extra; + encode(created, extra); + reply->set_extra_bl(extra); + } + mds->send_message_client(reply, session); + + if (req->is_queued_for_replay()) + mds->queue_one_replay(); + + return; + } + if (req->get_op() != CEPH_MDS_OP_OPEN && + req->get_op() != CEPH_MDS_OP_CREATE) { + dout(10) << " completed request which created new inode " << created + << ", convert it to lookup request" << dendl; + req->head.op = req->get_dentry_wanted() ? CEPH_MDS_OP_LOOKUP : CEPH_MDS_OP_GETATTR; + req->head.args.getattr.mask = CEPH_STAT_CAP_INODE_ALL; + } + } + } + + // trim completed_request list + if (req->get_oldest_client_tid() > 0) { + dout(15) << " oldest_client_tid=" << req->get_oldest_client_tid() << dendl; + ceph_assert(session); + if (session->trim_completed_requests(req->get_oldest_client_tid())) { + // Sessions 'completed_requests' was dirtied, mark it to be + // potentially flushed at segment expiry. + mdlog->get_current_segment()->touched_sessions.insert(session->info.inst.name); + + if (session->get_num_trim_requests_warnings() > 0 && + session->get_num_completed_requests() * 2 < g_conf()->mds_max_completed_requests) + session->reset_num_trim_requests_warnings(); + } else { + if (session->get_num_completed_requests() >= + (g_conf()->mds_max_completed_requests << session->get_num_trim_requests_warnings())) { + session->inc_num_trim_requests_warnings(); + stringstream ss; + ss << "client." << session->get_client() << " does not advance its oldest_client_tid (" + << req->get_oldest_client_tid() << "), " + << session->get_num_completed_requests() + << " completed requests recorded in session\n"; + mds->clog->warn() << ss.str(); + dout(20) << __func__ << " " << ss.str() << dendl; + } + } + } + + // register + dispatch + MDRequestRef mdr = mdcache->request_start(req); + if (!mdr.get()) + return; + + if (session) { + mdr->session = session; + session->requests.push_back(&mdr->item_session_request); + } + + if (has_completed) + mdr->has_completed = true; + + // process embedded cap releases? + // (only if NOT replay!) + if (!req->releases.empty() && req->get_source().is_client() && !req->is_replay()) { + client_t client = req->get_source().num(); + for (const auto &r : req->releases) { + mds->locker->process_request_cap_release(mdr, client, r.item, r.dname); + } + req->releases.clear(); + } + + dispatch_client_request(mdr); + return; +} + +void Server::handle_osd_map() +{ + /* Note that we check the OSDMAP_FULL flag directly rather than + * using osdmap_full_flag(), because we want to know "is the flag set" + * rather than "does the flag apply to us?" */ + mds->objecter->with_osdmap([this](const OSDMap& o) { + auto pi = o.get_pg_pool(mds->mdsmap->get_metadata_pool()); + is_full = pi && pi->has_flag(pg_pool_t::FLAG_FULL); + dout(7) << __func__ << ": full = " << is_full << " epoch = " + << o.get_epoch() << dendl; + }); +} + +void Server::dispatch_client_request(MDRequestRef& mdr) +{ + // we shouldn't be waiting on anyone. + ceph_assert(!mdr->has_more() || mdr->more()->waiting_on_slave.empty()); + + if (mdr->killed) { + dout(10) << "request " << *mdr << " was killed" << dendl; + return; + } else if (mdr->aborted) { + mdr->aborted = false; + mdcache->request_kill(mdr); + return; + } + + const MClientRequest::const_ref &req = mdr->client_request; + + if (logger) logger->inc(l_mdss_dispatch_client_request); + + dout(7) << "dispatch_client_request " << *req << dendl; + + if (req->may_write()) { + if (mdcache->is_readonly()) { + dout(10) << " read-only FS" << dendl; + respond_to_request(mdr, -EROFS); + return; + } + if (mdr->has_more() && mdr->more()->slave_error) { + dout(10) << " got error from slaves" << dendl; + respond_to_request(mdr, mdr->more()->slave_error); + return; + } + } + + if (is_full) { + if (req->get_op() == CEPH_MDS_OP_SETLAYOUT || + req->get_op() == CEPH_MDS_OP_SETDIRLAYOUT || + req->get_op() == CEPH_MDS_OP_SETLAYOUT || + req->get_op() == CEPH_MDS_OP_RMXATTR || + req->get_op() == CEPH_MDS_OP_SETXATTR || + req->get_op() == CEPH_MDS_OP_CREATE || + req->get_op() == CEPH_MDS_OP_SYMLINK || + req->get_op() == CEPH_MDS_OP_MKSNAP || + ((req->get_op() == CEPH_MDS_OP_LINK || + req->get_op() == CEPH_MDS_OP_RENAME) && + (!mdr->has_more() || mdr->more()->witnessed.empty())) // haven't started slave request + ) { + + dout(20) << __func__ << ": full, responding ENOSPC to op " << ceph_mds_op_name(req->get_op()) << dendl; + respond_to_request(mdr, -ENOSPC); + return; + } else { + dout(20) << __func__ << ": full, permitting op " << ceph_mds_op_name(req->get_op()) << dendl; + } + } + + switch (req->get_op()) { + case CEPH_MDS_OP_LOOKUPHASH: + case CEPH_MDS_OP_LOOKUPINO: + handle_client_lookup_ino(mdr, false, false); + break; + case CEPH_MDS_OP_LOOKUPPARENT: + handle_client_lookup_ino(mdr, true, false); + break; + case CEPH_MDS_OP_LOOKUPNAME: + handle_client_lookup_ino(mdr, false, true); + break; + + // inodes ops. + case CEPH_MDS_OP_LOOKUP: + handle_client_getattr(mdr, true); + break; + + case CEPH_MDS_OP_LOOKUPSNAP: + // lookupsnap does not reference a CDentry; treat it as a getattr + case CEPH_MDS_OP_GETATTR: + handle_client_getattr(mdr, false); + break; + + case CEPH_MDS_OP_SETATTR: + handle_client_setattr(mdr); + break; + case CEPH_MDS_OP_SETLAYOUT: + handle_client_setlayout(mdr); + break; + case CEPH_MDS_OP_SETDIRLAYOUT: + handle_client_setdirlayout(mdr); + break; + case CEPH_MDS_OP_SETXATTR: + handle_client_setxattr(mdr); + break; + case CEPH_MDS_OP_RMXATTR: + handle_client_removexattr(mdr); + break; + + case CEPH_MDS_OP_READDIR: + handle_client_readdir(mdr); + break; + + case CEPH_MDS_OP_SETFILELOCK: + handle_client_file_setlock(mdr); + break; + + case CEPH_MDS_OP_GETFILELOCK: + handle_client_file_readlock(mdr); + break; + + // funky. + case CEPH_MDS_OP_CREATE: + if (mdr->has_completed) + handle_client_open(mdr); // already created.. just open + else + handle_client_openc(mdr); + break; + + case CEPH_MDS_OP_OPEN: + handle_client_open(mdr); + break; + + // namespace. + // no prior locks. + case CEPH_MDS_OP_MKNOD: + handle_client_mknod(mdr); + break; + case CEPH_MDS_OP_LINK: + handle_client_link(mdr); + break; + case CEPH_MDS_OP_UNLINK: + case CEPH_MDS_OP_RMDIR: + handle_client_unlink(mdr); + break; + case CEPH_MDS_OP_RENAME: + handle_client_rename(mdr); + break; + case CEPH_MDS_OP_MKDIR: + handle_client_mkdir(mdr); + break; + case CEPH_MDS_OP_SYMLINK: + handle_client_symlink(mdr); + break; + + + // snaps + case CEPH_MDS_OP_LSSNAP: + handle_client_lssnap(mdr); + break; + case CEPH_MDS_OP_MKSNAP: + handle_client_mksnap(mdr); + break; + case CEPH_MDS_OP_RMSNAP: + handle_client_rmsnap(mdr); + break; + case CEPH_MDS_OP_RENAMESNAP: + handle_client_renamesnap(mdr); + break; + + default: + dout(1) << " unknown client op " << req->get_op() << dendl; + respond_to_request(mdr, -EOPNOTSUPP); + } +} + + +// --------------------------------------- +// SLAVE REQUESTS + +void Server::handle_slave_request(const MMDSSlaveRequest::const_ref &m) +{ + dout(4) << "handle_slave_request " << m->get_reqid() << " from " << m->get_source() << dendl; + mds_rank_t from = mds_rank_t(m->get_source().num()); + + if (logger) logger->inc(l_mdss_handle_slave_request); + + // reply? + if (m->is_reply()) + return handle_slave_request_reply(m); + + // the purpose of rename notify is enforcing causal message ordering. making sure + // bystanders have received all messages from rename srcdn's auth MDS. + if (m->get_op() == MMDSSlaveRequest::OP_RENAMENOTIFY) { + auto reply = MMDSSlaveRequest::create(m->get_reqid(), m->get_attempt(), MMDSSlaveRequest::OP_RENAMENOTIFYACK); + mds->send_message(reply, m->get_connection()); + return; + } + + CDentry *straydn = NULL; + if (m->straybl.length() > 0) { + straydn = mdcache->add_replica_stray(m->straybl, from); + ceph_assert(straydn); + m->straybl.clear(); + } + + // am i a new slave? + MDRequestRef mdr; + if (mdcache->have_request(m->get_reqid())) { + // existing? + mdr = mdcache->request_get(m->get_reqid()); + + // is my request newer? + if (mdr->attempt > m->get_attempt()) { + dout(10) << "local request " << *mdr << " attempt " << mdr->attempt << " > " << m->get_attempt() + << ", dropping " << *m << dendl; + return; + } + + + if (mdr->attempt < m->get_attempt()) { + // mine is old, close it out + dout(10) << "local request " << *mdr << " attempt " << mdr->attempt << " < " << m->get_attempt() + << ", closing out" << dendl; + mdcache->request_finish(mdr); + mdr.reset(); + } else if (mdr->slave_to_mds != from) { + dout(10) << "local request " << *mdr << " not slave to mds." << from << dendl; + return; + } + + if (m->get_op() == MMDSSlaveRequest::OP_FINISH && m->is_abort()) { + mdr->aborted = true; + if (mdr->slave_request) { + // only abort on-going xlock, wrlock and auth pin + ceph_assert(!mdr->slave_did_prepare()); + } else { + mdcache->request_finish(mdr); + } + return; + } + } + if (!mdr.get()) { + // new? + if (m->get_op() == MMDSSlaveRequest::OP_FINISH) { + dout(10) << "missing slave request for " << m->get_reqid() + << " OP_FINISH, must have lost race with a forward" << dendl; + return; + } + mdr = mdcache->request_start_slave(m->get_reqid(), m->get_attempt(), m); + mdr->set_op_stamp(m->op_stamp); + } + ceph_assert(mdr->slave_request == 0); // only one at a time, please! + + if (straydn) { + mdr->pin(straydn); + mdr->straydn = straydn; + } + + if (!mds->is_clientreplay() && !mds->is_active() && !mds->is_stopping()) { + dout(3) << "not clientreplay|active yet, waiting" << dendl; + mds->wait_for_replay(new C_MDS_RetryMessage(mds, m)); + return; + } else if (mds->is_clientreplay() && !mds->mdsmap->is_clientreplay(from) && + mdr->locks.empty()) { + dout(3) << "not active yet, waiting" << dendl; + mds->wait_for_active(new C_MDS_RetryMessage(mds, m)); + return; + } + + mdr->reset_slave_request(m); + + dispatch_slave_request(mdr); +} + +void Server::handle_slave_request_reply(const MMDSSlaveRequest::const_ref &m) +{ + mds_rank_t from = mds_rank_t(m->get_source().num()); + + if (!mds->is_clientreplay() && !mds->is_active() && !mds->is_stopping()) { + metareqid_t r = m->get_reqid(); + if (!mdcache->have_uncommitted_master(r, from)) { + dout(10) << "handle_slave_request_reply ignoring slave reply from mds." + << from << " reqid " << r << dendl; + return; + } + dout(3) << "not clientreplay|active yet, waiting" << dendl; + mds->wait_for_replay(new C_MDS_RetryMessage(mds, m)); + return; + } + + if (m->get_op() == MMDSSlaveRequest::OP_COMMITTED) { + metareqid_t r = m->get_reqid(); + mdcache->committed_master_slave(r, from); + return; + } + + MDRequestRef mdr = mdcache->request_get(m->get_reqid()); + if (m->get_attempt() != mdr->attempt) { + dout(10) << "handle_slave_request_reply " << *mdr << " ignoring reply from other attempt " + << m->get_attempt() << dendl; + return; + } + + switch (m->get_op()) { + case MMDSSlaveRequest::OP_XLOCKACK: + { + // identify lock, master request + SimpleLock *lock = mds->locker->get_lock(m->get_lock_type(), + m->get_object_info()); + mdr->more()->slaves.insert(from); + lock->decode_locked_state(m->get_lock_data()); + dout(10) << "got remote xlock on " << *lock << " on " << *lock->get_parent() << dendl; + mdr->locks.emplace_hint(mdr->locks.end(), lock, MutationImpl::LockOp::XLOCK); + mdr->finish_locking(lock); + lock->get_xlock(mdr, mdr->get_client()); + + ceph_assert(mdr->more()->waiting_on_slave.count(from)); + mdr->more()->waiting_on_slave.erase(from); + ceph_assert(mdr->more()->waiting_on_slave.empty()); + mdcache->dispatch_request(mdr); + } + break; + + case MMDSSlaveRequest::OP_WRLOCKACK: + { + // identify lock, master request + SimpleLock *lock = mds->locker->get_lock(m->get_lock_type(), + m->get_object_info()); + mdr->more()->slaves.insert(from); + dout(10) << "got remote wrlock on " << *lock << " on " << *lock->get_parent() << dendl; + auto it = mdr->locks.emplace_hint(mdr->locks.end(), + lock, MutationImpl::LockOp::REMOTE_WRLOCK, from); + ceph_assert(it->is_remote_wrlock()); + ceph_assert(it->wrlock_target == from); + + mdr->finish_locking(lock); + + ceph_assert(mdr->more()->waiting_on_slave.count(from)); + mdr->more()->waiting_on_slave.erase(from); + ceph_assert(mdr->more()->waiting_on_slave.empty()); + mdcache->dispatch_request(mdr); + } + break; + + case MMDSSlaveRequest::OP_AUTHPINACK: + handle_slave_auth_pin_ack(mdr, m); + break; + + case MMDSSlaveRequest::OP_LINKPREPACK: + handle_slave_link_prep_ack(mdr, m); + break; + + case MMDSSlaveRequest::OP_RMDIRPREPACK: + handle_slave_rmdir_prep_ack(mdr, m); + break; + + case MMDSSlaveRequest::OP_RENAMEPREPACK: + handle_slave_rename_prep_ack(mdr, m); + break; + + case MMDSSlaveRequest::OP_RENAMENOTIFYACK: + handle_slave_rename_notify_ack(mdr, m); + break; + + default: + ceph_abort(); + } +} + +void Server::dispatch_slave_request(MDRequestRef& mdr) +{ + dout(7) << "dispatch_slave_request " << *mdr << " " << *mdr->slave_request << dendl; + + if (mdr->aborted) { + dout(7) << " abort flag set, finishing" << dendl; + mdcache->request_finish(mdr); + return; + } + + if (logger) logger->inc(l_mdss_dispatch_slave_request); + + int op = mdr->slave_request->get_op(); + switch (op) { + case MMDSSlaveRequest::OP_XLOCK: + case MMDSSlaveRequest::OP_WRLOCK: + { + // identify object + SimpleLock *lock = mds->locker->get_lock(mdr->slave_request->get_lock_type(), + mdr->slave_request->get_object_info()); + + if (!lock) { + dout(10) << "don't have object, dropping" << dendl; + ceph_abort(); // can this happen, if we auth pinned properly. + } + if (op == MMDSSlaveRequest::OP_XLOCK && !lock->get_parent()->is_auth()) { + dout(10) << "not auth for remote xlock attempt, dropping on " + << *lock << " on " << *lock->get_parent() << dendl; + } else { + // use acquire_locks so that we get auth_pinning. + MutationImpl::LockOpVec lov; + for (const auto& p : mdr->locks) { + if (p.is_xlock()) + lov.add_xlock(p.lock); + else if (p.is_wrlock()) + lov.add_wrlock(p.lock); + } + + int replycode = 0; + switch (op) { + case MMDSSlaveRequest::OP_XLOCK: + lov.add_xlock(lock); + replycode = MMDSSlaveRequest::OP_XLOCKACK; + break; + case MMDSSlaveRequest::OP_WRLOCK: + lov.add_wrlock(lock); + replycode = MMDSSlaveRequest::OP_WRLOCKACK; + break; + } + + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + // ack + auto r = MMDSSlaveRequest::create(mdr->reqid, mdr->attempt, replycode); + r->set_lock_type(lock->get_type()); + lock->get_parent()->set_object_info(r->get_object_info()); + if (replycode == MMDSSlaveRequest::OP_XLOCKACK) + lock->encode_locked_state(r->get_lock_data()); + mds->send_message(r, mdr->slave_request->get_connection()); + } + + // done. + mdr->reset_slave_request(); + } + break; + + case MMDSSlaveRequest::OP_UNXLOCK: + case MMDSSlaveRequest::OP_UNWRLOCK: + { + SimpleLock *lock = mds->locker->get_lock(mdr->slave_request->get_lock_type(), + mdr->slave_request->get_object_info()); + ceph_assert(lock); + auto it = mdr->locks.find(lock); + ceph_assert(it != mdr->locks.end()); + bool need_issue = false; + switch (op) { + case MMDSSlaveRequest::OP_UNXLOCK: + mds->locker->xlock_finish(it, mdr.get(), &need_issue); + break; + case MMDSSlaveRequest::OP_UNWRLOCK: + mds->locker->wrlock_finish(it, mdr.get(), &need_issue); + break; + } + if (need_issue) + mds->locker->issue_caps(static_cast<CInode*>(lock->get_parent())); + + // done. no ack necessary. + mdr->reset_slave_request(); + } + break; + + case MMDSSlaveRequest::OP_DROPLOCKS: + mds->locker->drop_locks(mdr.get()); + mdr->reset_slave_request(); + break; + + case MMDSSlaveRequest::OP_AUTHPIN: + handle_slave_auth_pin(mdr); + break; + + case MMDSSlaveRequest::OP_LINKPREP: + case MMDSSlaveRequest::OP_UNLINKPREP: + handle_slave_link_prep(mdr); + break; + + case MMDSSlaveRequest::OP_RMDIRPREP: + handle_slave_rmdir_prep(mdr); + break; + + case MMDSSlaveRequest::OP_RENAMEPREP: + handle_slave_rename_prep(mdr); + break; + + case MMDSSlaveRequest::OP_FINISH: + // information about rename imported caps + if (mdr->slave_request->inode_export.length() > 0) + mdr->more()->inode_import = mdr->slave_request->inode_export; + // finish off request. + mdcache->request_finish(mdr); + break; + + default: + ceph_abort(); + } +} + +void Server::handle_slave_auth_pin(MDRequestRef& mdr) +{ + dout(10) << "handle_slave_auth_pin " << *mdr << dendl; + + // build list of objects + list<MDSCacheObject*> objects; + CInode *auth_pin_freeze = NULL; + bool fail = false, wouldblock = false, readonly = false; + + if (mdcache->is_readonly()) { + dout(10) << " read-only FS" << dendl; + readonly = true; + fail = true; + } + + if (!fail) { + for (const auto &oi : mdr->slave_request->get_authpins()) { + MDSCacheObject *object = mdcache->get_object(oi); + if (!object) { + dout(10) << " don't have " << oi << dendl; + fail = true; + break; + } + + objects.push_back(object); + if (oi == mdr->slave_request->get_authpin_freeze()) + auth_pin_freeze = static_cast<CInode*>(object); + } + } + + // can we auth pin them? + if (!fail) { + for (list<MDSCacheObject*>::iterator p = objects.begin(); + p != objects.end(); + ++p) { + if (!(*p)->is_auth()) { + dout(10) << " not auth for " << **p << dendl; + fail = true; + break; + } + if (mdr->is_auth_pinned(*p)) + continue; + if (!mdr->can_auth_pin(*p)) { + if (mdr->slave_request->is_nonblock()) { + dout(10) << " can't auth_pin (freezing?) " << **p << " nonblocking" << dendl; + fail = true; + wouldblock = true; + break; + } + // wait + dout(10) << " waiting for authpinnable on " << **p << dendl; + (*p)->add_waiter(CDir::WAIT_UNFREEZE, new C_MDS_RetryRequest(mdcache, mdr)); + mdr->drop_local_auth_pins(); + + mds->locker->notify_freeze_waiter(*p); + return; + } + } + } + + // auth pin! + if (fail) { + mdr->drop_local_auth_pins(); // just in case + } else { + /* freeze authpin wrong inode */ + if (mdr->has_more() && mdr->more()->is_freeze_authpin && + mdr->more()->rename_inode != auth_pin_freeze) + mdr->unfreeze_auth_pin(true); + + /* handle_slave_rename_prep() call freeze_inode() to wait for all other operations + * on the source inode to complete. This happens after all locks for the rename + * operation are acquired. But to acquire locks, we need auth pin locks' parent + * objects first. So there is an ABBA deadlock if someone auth pins the source inode + * after locks are acquired and before Server::handle_slave_rename_prep() is called. + * The solution is freeze the inode and prevent other MDRequests from getting new + * auth pins. + */ + if (auth_pin_freeze) { + dout(10) << " freezing auth pin on " << *auth_pin_freeze << dendl; + if (!mdr->freeze_auth_pin(auth_pin_freeze)) { + auth_pin_freeze->add_waiter(CInode::WAIT_FROZEN, new C_MDS_RetryRequest(mdcache, mdr)); + mds->mdlog->flush(); + return; + } + } + for (list<MDSCacheObject*>::iterator p = objects.begin(); + p != objects.end(); + ++p) { + dout(10) << "auth_pinning " << **p << dendl; + mdr->auth_pin(*p); + } + } + + // ack! + auto reply = MMDSSlaveRequest::create(mdr->reqid, mdr->attempt, MMDSSlaveRequest::OP_AUTHPINACK); + + // return list of my auth_pins (if any) + for (const auto &p : mdr->auth_pins) { + MDSCacheObjectInfo info; + p->set_object_info(info); + reply->get_authpins().push_back(info); + if (p == (MDSCacheObject*)auth_pin_freeze) + auth_pin_freeze->set_object_info(reply->get_authpin_freeze()); + } + + if (wouldblock) + reply->mark_error_wouldblock(); + if (readonly) + reply->mark_error_rofs(); + + mds->send_message_mds(reply, mdr->slave_to_mds); + + // clean up this request + mdr->reset_slave_request(); + return; +} + +void Server::handle_slave_auth_pin_ack(MDRequestRef& mdr, const MMDSSlaveRequest::const_ref &ack) +{ + dout(10) << "handle_slave_auth_pin_ack on " << *mdr << " " << *ack << dendl; + mds_rank_t from = mds_rank_t(ack->get_source().num()); + + // added auth pins? + set<MDSCacheObject*> pinned; + for (const auto &oi : ack->get_authpins()) { + MDSCacheObject *object = mdcache->get_object(oi); + ceph_assert(object); // we pinned it + dout(10) << " remote has pinned " << *object << dendl; + if (!mdr->is_auth_pinned(object)) + mdr->remote_auth_pins[object] = from; + if (oi == ack->get_authpin_freeze()) + mdr->set_remote_frozen_auth_pin(static_cast<CInode *>(object)); + pinned.insert(object); + } + + // removed frozen auth pin ? + if (mdr->more()->is_remote_frozen_authpin && + ack->get_authpin_freeze() == MDSCacheObjectInfo()) { + auto p = mdr->remote_auth_pins.find(mdr->more()->rename_inode); + ceph_assert(p != mdr->remote_auth_pins.end()); + if (p->second == from) { + mdr->more()->is_remote_frozen_authpin = false; + } + } + + // removed auth pins? + auto p = mdr->remote_auth_pins.begin(); + while (p != mdr->remote_auth_pins.end()) { + MDSCacheObject* object = p->first; + if (p->second == from && pinned.count(object) == 0) { + dout(10) << " remote has unpinned " << *object << dendl; + mdr->remote_auth_pins.erase(p++); + } else { + ++p; + } + } + + if (ack->is_error_rofs()) { + mdr->more()->slave_error = -EROFS; + mdr->aborted = true; + } else if (ack->is_error_wouldblock()) { + mdr->more()->slave_error = -EWOULDBLOCK; + mdr->aborted = true; + } + + // note slave + mdr->more()->slaves.insert(from); + + // clear from waiting list + ceph_assert(mdr->more()->waiting_on_slave.count(from)); + mdr->more()->waiting_on_slave.erase(from); + + // go again? + if (mdr->more()->waiting_on_slave.empty()) + mdcache->dispatch_request(mdr); + else + dout(10) << "still waiting on slaves " << mdr->more()->waiting_on_slave << dendl; +} + + +// --------------------------------------- +// HELPERS + + +/** + * check whether we are permitted to complete a request + * + * Check whether we have permission to perform the operation specified + * by mask on the given inode, based on the capability in the mdr's + * session. + */ +bool Server::check_access(MDRequestRef& mdr, CInode *in, unsigned mask) +{ + if (mdr->session) { + int r = mdr->session->check_access( + in, mask, + mdr->client_request->get_caller_uid(), + mdr->client_request->get_caller_gid(), + &mdr->client_request->get_caller_gid_list(), + mdr->client_request->head.args.setattr.uid, + mdr->client_request->head.args.setattr.gid); + if (r < 0) { + respond_to_request(mdr, r); + return false; + } + } + return true; +} + +/** + * check whether fragment has reached maximum size + * + */ +bool Server::check_fragment_space(MDRequestRef &mdr, CDir *in) +{ + const auto size = in->get_frag_size(); + if (size >= g_conf()->mds_bal_fragment_size_max) { + dout(10) << "fragment " << *in << " size exceeds " << g_conf()->mds_bal_fragment_size_max << " (ENOSPC)" << dendl; + respond_to_request(mdr, -ENOSPC); + return false; + } + + return true; +} + + +/** validate_dentry_dir + * + * verify that the dir exists and would own the dname. + * do not check if the dentry exists. + */ +CDir *Server::validate_dentry_dir(MDRequestRef& mdr, CInode *diri, std::string_view dname) +{ + // make sure parent is a dir? + if (!diri->is_dir()) { + dout(7) << "validate_dentry_dir: not a dir" << dendl; + respond_to_request(mdr, -ENOTDIR); + return NULL; + } + + // which dirfrag? + frag_t fg = diri->pick_dirfrag(dname); + CDir *dir = try_open_auth_dirfrag(diri, fg, mdr); + if (!dir) + return 0; + + // frozen? + if (dir->is_frozen()) { + dout(7) << "dir is frozen " << *dir << dendl; + dir->add_waiter(CDir::WAIT_UNFREEZE, new C_MDS_RetryRequest(mdcache, mdr)); + return NULL; + } + + return dir; +} + + +/** prepare_null_dentry + * prepare a null (or existing) dentry in given dir. + * wait for any dn lock. + */ +CDentry* Server::prepare_null_dentry(MDRequestRef& mdr, CDir *dir, std::string_view dname, bool okexist) +{ + dout(10) << "prepare_null_dentry " << dname << " in " << *dir << dendl; + ceph_assert(dir->is_auth()); + + client_t client = mdr->get_client(); + + // does it already exist? + CDentry *dn = dir->lookup(dname); + if (dn) { + /* + if (dn->lock.is_xlocked_by_other(mdr)) { + dout(10) << "waiting on xlocked dentry " << *dn << dendl; + dn->lock.add_waiter(SimpleLock::WAIT_RD, new C_MDS_RetryRequest(mdcache, mdr)); + return 0; + } + */ + if (!dn->get_linkage(client, mdr)->is_null()) { + // name already exists + dout(10) << "dentry " << dname << " exists in " << *dir << dendl; + if (!okexist) { + respond_to_request(mdr, -EEXIST); + return 0; + } + } else { + snapid_t next_snap = mdcache->get_global_snaprealm()->get_newest_seq() + 1; + dn->first = std::max(dn->first, next_snap); + } + return dn; + } + + // make sure dir is complete + if (!dir->is_complete() && (!dir->has_bloom() || dir->is_in_bloom(dname))) { + dout(7) << " incomplete dir contents for " << *dir << ", fetching" << dendl; + dir->fetch(new C_MDS_RetryRequest(mdcache, mdr)); + return 0; + } + + // create + dn = dir->add_null_dentry(dname, mdcache->get_global_snaprealm()->get_newest_seq() + 1); + dn->mark_new(); + dout(10) << "prepare_null_dentry added " << *dn << dendl; + return dn; +} + +CDentry* Server::prepare_stray_dentry(MDRequestRef& mdr, CInode *in) +{ + CDentry *straydn = mdr->straydn; + if (straydn) { + string straydname; + in->name_stray_dentry(straydname); + if (straydn->get_name() == straydname) + return straydn; + + ceph_assert(!mdr->done_locking); + mdr->unpin(straydn); + } + + CDir *straydir = mdcache->get_stray_dir(in); + + if (!mdr->client_request->is_replay() && + !check_fragment_space(mdr, straydir)) + return NULL; + + straydn = mdcache->get_or_create_stray_dentry(in); + mdr->straydn = straydn; + mdr->pin(straydn); + return straydn; +} + +/** prepare_new_inode + * + * create a new inode. set c/m/atime. hit dir pop. + */ +CInode* Server::prepare_new_inode(MDRequestRef& mdr, CDir *dir, inodeno_t useino, unsigned mode, + file_layout_t *layout) +{ + CInode *in = new CInode(mdcache); + + // Server::prepare_force_open_sessions() can re-open session in closing + // state. In that corner case, session's prealloc_inos are being freed. + // To simplify the code, we disallow using/refilling session's prealloc_ino + // while session is opening. + bool allow_prealloc_inos = mdr->session->is_open(); + + // assign ino + if (allow_prealloc_inos && + mdr->session->info.prealloc_inos.size()) { + mdr->used_prealloc_ino = + in->inode.ino = mdr->session->take_ino(useino); // prealloc -> used + mds->sessionmap.mark_projected(mdr->session); + + dout(10) << "prepare_new_inode used_prealloc " << mdr->used_prealloc_ino + << " (" << mdr->session->info.prealloc_inos + << ", " << mdr->session->info.prealloc_inos.size() << " left)" + << dendl; + } else { + mdr->alloc_ino = + in->inode.ino = mds->inotable->project_alloc_id(useino); + dout(10) << "prepare_new_inode alloc " << mdr->alloc_ino << dendl; + } + + if (useino && useino != in->inode.ino) { + dout(0) << "WARNING: client specified " << useino << " and i allocated " << in->inode.ino << dendl; + mds->clog->error() << mdr->client_request->get_source() + << " specified ino " << useino + << " but mds." << mds->get_nodeid() << " allocated " << in->inode.ino; + //ceph_abort(); // just for now. + } + + if (allow_prealloc_inos && + mdr->session->get_num_projected_prealloc_inos() < g_conf()->mds_client_prealloc_inos / 2) { + int need = g_conf()->mds_client_prealloc_inos - mdr->session->get_num_projected_prealloc_inos(); + mds->inotable->project_alloc_ids(mdr->prealloc_inos, need); + ceph_assert(mdr->prealloc_inos.size()); // or else fix projected increment semantics + mdr->session->pending_prealloc_inos.insert(mdr->prealloc_inos); + mds->sessionmap.mark_projected(mdr->session); + dout(10) << "prepare_new_inode prealloc " << mdr->prealloc_inos << dendl; + } + + in->inode.version = 1; + in->inode.xattr_version = 1; + in->inode.nlink = 1; // FIXME + + in->inode.mode = mode; + + // FIPS zeroization audit 20191117: this memset is not security related. + memset(&in->inode.dir_layout, 0, sizeof(in->inode.dir_layout)); + if (in->inode.is_dir()) { + in->inode.dir_layout.dl_dir_hash = g_conf()->mds_default_dir_hash; + } else if (layout) { + in->inode.layout = *layout; + } else { + in->inode.layout = mdcache->default_file_layout; + } + + in->inode.truncate_size = -1ull; // not truncated, yet! + in->inode.truncate_seq = 1; /* starting with 1, 0 is kept for no-truncation logic */ + + CInode *diri = dir->get_inode(); + + dout(10) << oct << " dir mode 0" << diri->inode.mode << " new mode 0" << mode << dec << dendl; + + if (diri->inode.mode & S_ISGID) { + dout(10) << " dir is sticky" << dendl; + in->inode.gid = diri->inode.gid; + if (S_ISDIR(mode)) { + dout(10) << " new dir also sticky" << dendl; + in->inode.mode |= S_ISGID; + } + } else + in->inode.gid = mdr->client_request->get_caller_gid(); + + in->inode.uid = mdr->client_request->get_caller_uid(); + + in->inode.btime = in->inode.ctime = in->inode.mtime = in->inode.atime = + mdr->get_op_stamp(); + + in->inode.change_attr = 0; + + const MClientRequest::const_ref &req = mdr->client_request; + if (req->get_data().length()) { + auto p = req->get_data().cbegin(); + + // xattrs on new inode? + CInode::mempool_xattr_map xattrs; + decode_noshare(xattrs, p); + for (const auto &p : xattrs) { + dout(10) << "prepare_new_inode setting xattr " << p.first << dendl; + auto em = in->xattrs.emplace(std::piecewise_construct, std::forward_as_tuple(p.first), std::forward_as_tuple(p.second)); + if (!em.second) + em.first->second = p.second; + } + } + + if (!mds->mdsmap->get_inline_data_enabled() || + !mdr->session->get_connection()->has_feature(CEPH_FEATURE_MDS_INLINE_DATA)) + in->inode.inline_data.version = CEPH_INLINE_NONE; + + mdcache->add_inode(in); // add + dout(10) << "prepare_new_inode " << *in << dendl; + return in; +} + +void Server::journal_allocated_inos(MDRequestRef& mdr, EMetaBlob *blob) +{ + dout(20) << "journal_allocated_inos sessionmapv " << mds->sessionmap.get_projected() + << " inotablev " << mds->inotable->get_projected_version() + << dendl; + blob->set_ino_alloc(mdr->alloc_ino, + mdr->used_prealloc_ino, + mdr->prealloc_inos, + mdr->client_request->get_source(), + mds->sessionmap.get_projected(), + mds->inotable->get_projected_version()); +} + +void Server::apply_allocated_inos(MDRequestRef& mdr, Session *session) +{ + dout(10) << "apply_allocated_inos " << mdr->alloc_ino + << " / " << mdr->prealloc_inos + << " / " << mdr->used_prealloc_ino << dendl; + + if (mdr->alloc_ino) { + mds->inotable->apply_alloc_id(mdr->alloc_ino); + } + if (mdr->prealloc_inos.size()) { + ceph_assert(session); + session->pending_prealloc_inos.subtract(mdr->prealloc_inos); + session->info.prealloc_inos.insert(mdr->prealloc_inos); + mds->sessionmap.mark_dirty(session, !mdr->used_prealloc_ino); + mds->inotable->apply_alloc_ids(mdr->prealloc_inos); + } + if (mdr->used_prealloc_ino) { + ceph_assert(session); + session->info.used_inos.erase(mdr->used_prealloc_ino); + mds->sessionmap.mark_dirty(session); + } +} + +class C_MDS_TryFindInode : public ServerContext { + MDRequestRef mdr; +public: + C_MDS_TryFindInode(Server *s, MDRequestRef& r) : ServerContext(s), mdr(r) {} + void finish(int r) override { + if (r == -ESTALE) // :( find_ino_peers failed + server->respond_to_request(mdr, r); + else + server->dispatch_client_request(mdr); + } +}; + +class CF_MDS_MDRContextFactory : public MDSContextFactory { +public: + CF_MDS_MDRContextFactory(MDCache *cache, MDRequestRef &mdr) : cache(cache), mdr(mdr) {} + MDSContext *build() { + return new C_MDS_RetryRequest(cache, mdr); + } +private: + MDCache *cache; + MDRequestRef mdr; +}; + +CDir *Server::traverse_to_auth_dir(MDRequestRef& mdr, vector<CDentry*> &trace, filepath refpath) +{ + // figure parent dir vs dname + if (refpath.depth() == 0) { + dout(7) << "can't do that to root" << dendl; + respond_to_request(mdr, -EINVAL); + return 0; + } + string dname = refpath.last_dentry(); + refpath.pop_dentry(); + + dout(10) << "traverse_to_auth_dir dirpath " << refpath << " dname " << dname << dendl; + + // traverse to parent dir + CInode *diri; + CF_MDS_MDRContextFactory cf(mdcache, mdr); + int r = mdcache->path_traverse(mdr, cf, refpath, &trace, &diri, MDS_TRAVERSE_FORWARD); + if (r > 0) return 0; // delayed + if (r < 0) { + if (r == -ESTALE) { + dout(10) << "FAIL on ESTALE but attempting recovery" << dendl; + mdcache->find_ino_peers(refpath.get_ino(), new C_MDS_TryFindInode(this, mdr)); + return 0; + } + respond_to_request(mdr, r); + return 0; + } + + // is it an auth dir? + CDir *dir = validate_dentry_dir(mdr, diri, dname); + if (!dir) + return 0; // forwarded or waiting for freeze + + dout(10) << "traverse_to_auth_dir " << *dir << dendl; + return dir; +} + +/* If this returns null, the request has been handled + * as appropriate: forwarded on, or the client's been replied to */ +CInode* Server::rdlock_path_pin_ref(MDRequestRef& mdr, int n, + MutationImpl::LockOpVec& lov, + bool want_auth, + bool no_want_auth, /* for readdir, who doesn't want auth _even_if_ it's + a snapped dir */ + file_layout_t **layout, + bool no_lookup) // true if we cannot return a null dentry lease +{ + const filepath& refpath = n ? mdr->get_filepath2() : mdr->get_filepath(); + dout(10) << "rdlock_path_pin_ref " << *mdr << " " << refpath << dendl; + + if (mdr->done_locking) + return mdr->in[n]; + + // traverse + CF_MDS_MDRContextFactory cf(mdcache, mdr); + int r = mdcache->path_traverse(mdr, cf, refpath, &mdr->dn[n], &mdr->in[n], MDS_TRAVERSE_FORWARD); + if (r > 0) + return NULL; // delayed + if (r < 0) { // error + if (r == -ENOENT && n == 0 && !mdr->dn[n].empty()) { + if (!no_lookup) { + mdr->tracedn = mdr->dn[n].back(); + } + respond_to_request(mdr, r); + } else if (r == -ESTALE) { + dout(10) << "FAIL on ESTALE but attempting recovery" << dendl; + MDSContext *c = new C_MDS_TryFindInode(this, mdr); + mdcache->find_ino_peers(refpath.get_ino(), c); + } else { + dout(10) << "FAIL on error " << r << dendl; + respond_to_request(mdr, r); + } + return 0; + } + CInode *ref = mdr->in[n]; + dout(10) << "ref is " << *ref << dendl; + + // fw to inode auth? + if (mdr->snapid != CEPH_NOSNAP && !no_want_auth) + want_auth = true; + + if (want_auth) { + if (ref->is_ambiguous_auth()) { + dout(10) << "waiting for single auth on " << *ref << dendl; + ref->add_waiter(CInode::WAIT_SINGLEAUTH, new C_MDS_RetryRequest(mdcache, mdr)); + return 0; + } + if (!ref->is_auth()) { + dout(10) << "fw to auth for " << *ref << dendl; + mdcache->request_forward(mdr, ref->authority().first); + return 0; + } + + // auth_pin? + // do NOT proceed if freezing, as cap release may defer in that case, and + // we could deadlock when we try to lock @ref. + // if we're already auth_pinned, continue; the release has already been processed. + if (ref->is_frozen() || ref->is_frozen_auth_pin() || + (ref->is_freezing() && !mdr->is_auth_pinned(ref))) { + dout(7) << "waiting for !frozen/authpinnable on " << *ref << dendl; + ref->add_waiter(CInode::WAIT_UNFREEZE, new C_MDS_RetryRequest(mdcache, mdr)); + /* If we have any auth pins, this will deadlock. + * But the only way to get here if we've already got auth pins + * is because we're on an inode with snapshots that got updated + * between dispatches of this request. So we're going to drop + * our locks and our auth pins and reacquire them later. + * + * This is safe since we're only in this function when working on + * a single MDS request; otherwise we'd be in + * rdlock_path_xlock_dentry. + */ + mds->locker->drop_locks(mdr.get(), NULL); + mdr->drop_local_auth_pins(); + if (!mdr->remote_auth_pins.empty()) + mds->locker->notify_freeze_waiter(ref); + return 0; + } + + mdr->auth_pin(ref); + } + + for (int i=0; i<(int)mdr->dn[n].size(); i++) + lov.add_rdlock(&mdr->dn[n][i]->lock); + if (layout) + mds->locker->include_snap_rdlocks_wlayout(ref, lov, layout); + else + mds->locker->include_snap_rdlocks(ref, lov); + + // set and pin ref + mdr->pin(ref); + return ref; +} + + +/** rdlock_path_xlock_dentry + * traverse path to the directory that could/would contain dentry. + * make sure i am auth for that dentry, forward as necessary. + * create null dentry in place (or use existing if okexist). + * get rdlocks on traversed dentries, xlock on new dentry. + */ +CDentry* Server::rdlock_path_xlock_dentry(MDRequestRef& mdr, int n, + MutationImpl::LockOpVec& lov, + bool okexist, bool mustexist, bool alwaysxlock, + file_layout_t **layout) +{ + const filepath& refpath = n ? mdr->get_filepath2() : mdr->get_filepath(); + + dout(10) << "rdlock_path_xlock_dentry " << *mdr << " " << refpath << dendl; + + client_t client = mdr->get_client(); + + if (mdr->done_locking) + return mdr->dn[n].back(); + + CDir *dir = traverse_to_auth_dir(mdr, mdr->dn[n], refpath); + if (!dir) return 0; + + CInode *diri = dir->get_inode(); + if (!mdr->reqid.name.is_mds()) { + if (diri->is_system() && !diri->is_root()) { + respond_to_request(mdr, -EROFS); + return 0; + } + } + if (!diri->is_base() && diri->get_projected_parent_dir()->inode->is_stray()) { + respond_to_request(mdr, -ENOENT); + return 0; + } + + // make a null dentry? + std::string_view dname = refpath.last_dentry(); + CDentry *dn; + if (mustexist) { + dn = dir->lookup(dname); + + // make sure dir is complete + if (!dn && !dir->is_complete() && + (!dir->has_bloom() || dir->is_in_bloom(dname))) { + dout(7) << " incomplete dir contents for " << *dir << ", fetching" << dendl; + dir->fetch(new C_MDS_RetryRequest(mdcache, mdr)); + return 0; + } + + // readable? + if (dn && !dn->lock.can_read(client) && dn->lock.get_xlock_by() != mdr) { + dout(10) << "waiting on xlocked dentry " << *dn << dendl; + dn->lock.add_waiter(SimpleLock::WAIT_RD, new C_MDS_RetryRequest(mdcache, mdr)); + return 0; + } + + // exists? + if (!dn || dn->get_linkage(client, mdr)->is_null()) { + dout(7) << "dentry " << dname << " dne in " << *dir << dendl; + respond_to_request(mdr, -ENOENT); + return 0; + } + } else { + dn = prepare_null_dentry(mdr, dir, dname, okexist); + if (!dn) + return 0; + } + + mdr->dn[n].push_back(dn); + CDentry::linkage_t *dnl = dn->get_linkage(client, mdr); + mdr->in[n] = dnl->get_inode(); + + // -- lock -- + // NOTE: rename takes the same set of locks for srcdn + for (int i=0; i<(int)mdr->dn[n].size(); i++) + lov.add_rdlock(&mdr->dn[n][i]->lock); + if (alwaysxlock || dnl->is_null()) + lov.add_xlock(&dn->lock); // new dn, xlock + else + lov.add_rdlock(&dn->lock); // existing dn, rdlock + lov.add_wrlock(&dn->get_dir()->inode->filelock); // also, wrlock on dir mtime + lov.add_wrlock(&dn->get_dir()->inode->nestlock); // also, wrlock on dir mtime + if (layout) + mds->locker->include_snap_rdlocks_wlayout(dn->get_dir()->inode, lov, layout); + else + mds->locker->include_snap_rdlocks(dn->get_dir()->inode, lov); + + return dn; +} + + + + + +/** + * try_open_auth_dirfrag -- open dirfrag, or forward to dirfrag auth + * + * @param diri base inode + * @param fg the exact frag we want + * @param mdr request + * @returns the pointer, or NULL if it had to be delayed (but mdr is taken care of) + */ +CDir* Server::try_open_auth_dirfrag(CInode *diri, frag_t fg, MDRequestRef& mdr) +{ + CDir *dir = diri->get_dirfrag(fg); + + // not open and inode not mine? + if (!dir && !diri->is_auth()) { + mds_rank_t inauth = diri->authority().first; + dout(7) << "try_open_auth_dirfrag: not open, not inode auth, fw to mds." << inauth << dendl; + mdcache->request_forward(mdr, inauth); + return 0; + } + + // not open and inode frozen? + if (!dir && diri->is_frozen()) { + dout(10) << "try_open_auth_dirfrag: dir inode is frozen, waiting " << *diri << dendl; + ceph_assert(diri->get_parent_dir()); + diri->add_waiter(CInode::WAIT_UNFREEZE, new C_MDS_RetryRequest(mdcache, mdr)); + return 0; + } + + // invent? + if (!dir) + dir = diri->get_or_open_dirfrag(mdcache, fg); + + // am i auth for the dirfrag? + if (!dir->is_auth()) { + mds_rank_t auth = dir->authority().first; + dout(7) << "try_open_auth_dirfrag: not auth for " << *dir + << ", fw to mds." << auth << dendl; + mdcache->request_forward(mdr, auth); + return 0; + } + + return dir; +} + + +// =============================================================================== +// STAT + +void Server::handle_client_getattr(MDRequestRef& mdr, bool is_lookup) +{ + const MClientRequest::const_ref &req = mdr->client_request; + + if (req->get_filepath().depth() == 0 && is_lookup) { + // refpath can't be empty for lookup but it can for + // getattr (we do getattr with empty refpath for mount of '/') + respond_to_request(mdr, -EINVAL); + return; + } + + bool want_auth = false; + int mask = req->head.args.getattr.mask; + if (mask & CEPH_STAT_RSTAT) + want_auth = true; // set want_auth for CEPH_STAT_RSTAT mask + + MutationImpl::LockOpVec lov; + CInode *ref = rdlock_path_pin_ref(mdr, 0, lov, want_auth, false, NULL, + !is_lookup); + if (!ref) return; + + /* + * if client currently holds the EXCL cap on a field, do not rdlock + * it; client's stat() will result in valid info if _either_ EXCL + * cap is held or MDS rdlocks and reads the value here. + * + * handling this case here is easier than weakening rdlock + * semantics... that would cause problems elsewhere. + */ + client_t client = mdr->get_client(); + int issued = 0; + Capability *cap = ref->get_client_cap(client); + if (cap && (mdr->snapid == CEPH_NOSNAP || + mdr->snapid <= cap->client_follows)) + issued = cap->issued(); + + if ((mask & CEPH_CAP_LINK_SHARED) && !(issued & CEPH_CAP_LINK_EXCL)) + lov.add_rdlock(&ref->linklock); + if ((mask & CEPH_CAP_AUTH_SHARED) && !(issued & CEPH_CAP_AUTH_EXCL)) + lov.add_rdlock(&ref->authlock); + if ((mask & CEPH_CAP_XATTR_SHARED) && !(issued & CEPH_CAP_XATTR_EXCL)) + lov.add_rdlock(&ref->xattrlock); + if ((mask & CEPH_CAP_FILE_SHARED) && !(issued & CEPH_CAP_FILE_EXCL)) { + // Don't wait on unstable filelock if client is allowed to read file size. + // This can reduce the response time of getattr in the case that multiple + // clients do stat(2) and there are writers. + // The downside of this optimization is that mds may not issue Fs caps along + // with getattr reply. Client may need to send more getattr requests. + if (mdr->is_rdlocked(&ref->filelock)) { + lov.add_rdlock(&ref->filelock); + } else if (ref->filelock.is_stable() || + ref->filelock.get_num_wrlocks() > 0 || + !ref->filelock.can_read(mdr->get_client())) { + lov.add_rdlock(&ref->filelock); + mdr->done_locking = false; + } + } + + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + if (!check_access(mdr, ref, MAY_READ)) + return; + + utime_t now = ceph_clock_now(); + mdr->set_mds_stamp(now); + + // note which caps are requested, so we return at least a snapshot + // value for them. (currently this matters for xattrs and inline data) + mdr->getattr_caps = mask; + + mds->balancer->hit_inode(ref, META_POP_IRD, req->get_source().num()); + + // reply + dout(10) << "reply to stat on " << *req << dendl; + mdr->tracei = ref; + if (is_lookup) + mdr->tracedn = mdr->dn[0].back(); + respond_to_request(mdr, 0); +} + +struct C_MDS_LookupIno2 : public ServerContext { + MDRequestRef mdr; + C_MDS_LookupIno2(Server *s, MDRequestRef& r) : ServerContext(s), mdr(r) {} + void finish(int r) override { + server->_lookup_ino_2(mdr, r); + } +}; + +/* + * filepath: ino + */ +void Server::handle_client_lookup_ino(MDRequestRef& mdr, + bool want_parent, bool want_dentry) +{ + const MClientRequest::const_ref &req = mdr->client_request; + + if ((uint64_t)req->head.args.lookupino.snapid > 0) + return _lookup_snap_ino(mdr); + + inodeno_t ino = req->get_filepath().get_ino(); + CInode *in = mdcache->get_inode(ino); + if (in && in->state_test(CInode::STATE_PURGING)) { + respond_to_request(mdr, -ESTALE); + return; + } + if (!in) { + mdcache->open_ino(ino, (int64_t)-1, new C_MDS_LookupIno2(this, mdr), false); + return; + } + + if (mdr && in->snaprealm && !in->snaprealm->have_past_parents_open() && + !in->snaprealm->open_parents(new C_MDS_RetryRequest(mdcache, mdr))) { + return; + } + + // check for nothing (not read or write); this still applies the + // path check. + if (!check_access(mdr, in, 0)) + return; + + CDentry *dn = in->get_projected_parent_dn(); + CInode *diri = dn ? dn->get_dir()->inode : NULL; + + MutationImpl::LockOpVec lov; + if (dn && (want_parent || want_dentry)) { + mdr->pin(dn); + lov.add_rdlock(&dn->lock); + } + + unsigned mask = req->head.args.lookupino.mask; + if (mask) { + Capability *cap = in->get_client_cap(mdr->get_client()); + int issued = 0; + if (cap && (mdr->snapid == CEPH_NOSNAP || mdr->snapid <= cap->client_follows)) + issued = cap->issued(); + // permission bits, ACL/security xattrs + if ((mask & CEPH_CAP_AUTH_SHARED) && (issued & CEPH_CAP_AUTH_EXCL) == 0) + lov.add_rdlock(&in->authlock); + if ((mask & CEPH_CAP_XATTR_SHARED) && (issued & CEPH_CAP_XATTR_EXCL) == 0) + lov.add_rdlock(&in->xattrlock); + + mdr->getattr_caps = mask; + } + + if (!lov.empty()) { + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + if (diri != NULL) { + // need read access to directory inode + if (!check_access(mdr, diri, MAY_READ)) + return; + } + } + + if (want_parent) { + if (in->is_base()) { + respond_to_request(mdr, -EINVAL); + return; + } + if (!diri || diri->is_stray()) { + respond_to_request(mdr, -ESTALE); + return; + } + dout(10) << "reply to lookup_parent " << *in << dendl; + mdr->tracei = diri; + respond_to_request(mdr, 0); + } else { + if (want_dentry) { + inodeno_t dirino = req->get_filepath2().get_ino(); + if (!diri || (dirino != inodeno_t() && diri->ino() != dirino)) { + respond_to_request(mdr, -ENOENT); + return; + } + dout(10) << "reply to lookup_name " << *in << dendl; + } else + dout(10) << "reply to lookup_ino " << *in << dendl; + + mdr->tracei = in; + if (want_dentry) + mdr->tracedn = dn; + respond_to_request(mdr, 0); + } +} + +void Server::_lookup_snap_ino(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + + vinodeno_t vino; + vino.ino = req->get_filepath().get_ino(); + vino.snapid = (__u64)req->head.args.lookupino.snapid; + inodeno_t parent_ino = (__u64)req->head.args.lookupino.parent; + __u32 hash = req->head.args.lookupino.hash; + + dout(7) << "lookup_snap_ino " << vino << " parent " << parent_ino << " hash " << hash << dendl; + + CInode *in = mdcache->lookup_snap_inode(vino); + if (!in) { + in = mdcache->get_inode(vino.ino); + if (in) { + if (in->state_test(CInode::STATE_PURGING) || + !in->has_snap_data(vino.snapid)) { + if (in->is_dir() || !parent_ino) { + respond_to_request(mdr, -ESTALE); + return; + } + in = NULL; + } + } + } + + if (in) { + dout(10) << "reply to lookup_snap_ino " << *in << dendl; + mdr->snapid = vino.snapid; + mdr->tracei = in; + respond_to_request(mdr, 0); + return; + } + + CInode *diri = NULL; + if (parent_ino) { + diri = mdcache->get_inode(parent_ino); + if (!diri) { + mdcache->open_ino(parent_ino, mds->mdsmap->get_metadata_pool(), new C_MDS_LookupIno2(this, mdr)); + return; + } + + if (!diri->is_dir()) { + respond_to_request(mdr, -EINVAL); + return; + } + + MutationImpl::LockOpVec lov; + lov.add_rdlock(&diri->dirfragtreelock); + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + frag_t frag = diri->dirfragtree[hash]; + CDir *dir = try_open_auth_dirfrag(diri, frag, mdr); + if (!dir) + return; + + if (!dir->is_complete()) { + if (dir->is_frozen()) { + mds->locker->drop_locks(mdr.get()); + mdr->drop_local_auth_pins(); + dir->add_waiter(CDir::WAIT_UNFREEZE, new C_MDS_RetryRequest(mdcache, mdr)); + return; + } + dir->fetch(new C_MDS_RetryRequest(mdcache, mdr), true); + return; + } + + respond_to_request(mdr, -ESTALE); + } else { + mdcache->open_ino(vino.ino, mds->mdsmap->get_metadata_pool(), new C_MDS_LookupIno2(this, mdr), false); + } +} + +void Server::_lookup_ino_2(MDRequestRef& mdr, int r) +{ + inodeno_t ino = mdr->client_request->get_filepath().get_ino(); + dout(10) << "_lookup_ino_2 " << mdr.get() << " ino " << ino << " r=" << r << dendl; + + // `r` is a rank if >=0, else an error code + if (r >= 0) { + mds_rank_t dest_rank(r); + if (dest_rank == mds->get_nodeid()) + dispatch_client_request(mdr); + else + mdcache->request_forward(mdr, dest_rank); + return; + } + + // give up + if (r == -ENOENT || r == -ENODATA) + r = -ESTALE; + respond_to_request(mdr, r); +} + + +/* This function takes responsibility for the passed mdr*/ +void Server::handle_client_open(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + dout(7) << "open on " << req->get_filepath() << dendl; + + int flags = req->head.args.open.flags; + int cmode = ceph_flags_to_mode(flags); + if (cmode < 0) { + respond_to_request(mdr, -EINVAL); + return; + } + + bool need_auth = !file_mode_is_readonly(cmode) || + (flags & (CEPH_O_TRUNC | CEPH_O_DIRECTORY)); + + if ((cmode & CEPH_FILE_MODE_WR) && mdcache->is_readonly()) { + dout(7) << "read-only FS" << dendl; + respond_to_request(mdr, -EROFS); + return; + } + + MutationImpl::LockOpVec lov; + CInode *cur = rdlock_path_pin_ref(mdr, 0, lov, need_auth); + if (!cur) + return; + + if (cur->is_frozen() || cur->state_test(CInode::STATE_EXPORTINGCAPS)) { + ceph_assert(!need_auth); + mdr->done_locking = false; + CInode *cur = rdlock_path_pin_ref(mdr, 0, lov, true); + if (!cur) + return; + } + + if (!cur->inode.is_file()) { + // can only open non-regular inode with mode FILE_MODE_PIN, at least for now. + cmode = CEPH_FILE_MODE_PIN; + // the inode is symlink and client wants to follow it, ignore the O_TRUNC flag. + if (cur->inode.is_symlink() && !(flags & CEPH_O_NOFOLLOW)) + flags &= ~CEPH_O_TRUNC; + } + + dout(10) << "open flags = " << flags + << ", filemode = " << cmode + << ", need_auth = " << need_auth + << dendl; + + // regular file? + /*if (!cur->inode.is_file() && !cur->inode.is_dir()) { + dout(7) << "not a file or dir " << *cur << dendl; + respond_to_request(mdr, -ENXIO); // FIXME what error do we want? + return; + }*/ + if ((flags & CEPH_O_DIRECTORY) && !cur->inode.is_dir() && !cur->inode.is_symlink()) { + dout(7) << "specified O_DIRECTORY on non-directory " << *cur << dendl; + respond_to_request(mdr, -EINVAL); + return; + } + + if ((flags & CEPH_O_TRUNC) && !cur->inode.is_file()) { + dout(7) << "specified O_TRUNC on !(file|symlink) " << *cur << dendl; + // we should return -EISDIR for directory, return -EINVAL for other non-regular + respond_to_request(mdr, cur->inode.is_dir() ? -EISDIR : -EINVAL); + return; + } + + if (cur->inode.inline_data.version != CEPH_INLINE_NONE && + !mdr->session->get_connection()->has_feature(CEPH_FEATURE_MDS_INLINE_DATA)) { + dout(7) << "old client cannot open inline data file " << *cur << dendl; + respond_to_request(mdr, -EPERM); + return; + } + + // snapped data is read only + if (mdr->snapid != CEPH_NOSNAP && + ((cmode & CEPH_FILE_MODE_WR) || req->may_write())) { + dout(7) << "snap " << mdr->snapid << " is read-only " << *cur << dendl; + respond_to_request(mdr, -EROFS); + return; + } + + unsigned mask = req->head.args.open.mask; + if (mask) { + Capability *cap = cur->get_client_cap(mdr->get_client()); + int issued = 0; + if (cap && (mdr->snapid == CEPH_NOSNAP || mdr->snapid <= cap->client_follows)) + issued = cap->issued(); + // permission bits, ACL/security xattrs + if ((mask & CEPH_CAP_AUTH_SHARED) && (issued & CEPH_CAP_AUTH_EXCL) == 0) + lov.add_rdlock(&cur->authlock); + if ((mask & CEPH_CAP_XATTR_SHARED) && (issued & CEPH_CAP_XATTR_EXCL) == 0) + lov.add_rdlock(&cur->xattrlock); + + mdr->getattr_caps = mask; + } + + // O_TRUNC + if ((flags & CEPH_O_TRUNC) && !mdr->has_completed) { + ceph_assert(cur->is_auth()); + + lov.add_xlock(&cur->filelock); + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + if (!check_access(mdr, cur, MAY_WRITE)) + return; + + // wait for pending truncate? + const auto pi = cur->get_projected_inode(); + if (pi->is_truncating()) { + dout(10) << " waiting for pending truncate from " << pi->truncate_from + << " to " << pi->truncate_size << " to complete on " << *cur << dendl; + mds->locker->drop_locks(mdr.get()); + mdr->drop_local_auth_pins(); + cur->add_waiter(CInode::WAIT_TRUNC, new C_MDS_RetryRequest(mdcache, mdr)); + return; + } + + do_open_truncate(mdr, cmode); + return; + } + + // sync filelock if snapped. + // this makes us wait for writers to flushsnaps, ensuring we get accurate metadata, + // and that data itself is flushed so that we can read the snapped data off disk. + if (mdr->snapid != CEPH_NOSNAP && !cur->is_dir()) { + lov.add_rdlock(&cur->filelock); + } + + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + mask = MAY_READ; + if (cmode & CEPH_FILE_MODE_WR) + mask |= MAY_WRITE; + if (!check_access(mdr, cur, mask)) + return; + + utime_t now = ceph_clock_now(); + mdr->set_mds_stamp(now); + + if (cur->is_file() || cur->is_dir()) { + if (mdr->snapid == CEPH_NOSNAP) { + // register new cap + Capability *cap = mds->locker->issue_new_caps(cur, cmode, mdr->session, 0, req->is_replay()); + if (cap) + dout(12) << "open issued caps " << ccap_string(cap->pending()) + << " for " << req->get_source() + << " on " << *cur << dendl; + } else { + int caps = ceph_caps_for_mode(cmode); + dout(12) << "open issued IMMUTABLE SNAP caps " << ccap_string(caps) + << " for " << req->get_source() + << " snapid " << mdr->snapid + << " on " << *cur << dendl; + mdr->snap_caps = caps; + } + } + + // increase max_size? + if (cmode & CEPH_FILE_MODE_WR) + mds->locker->check_inode_max_size(cur); + + // make sure this inode gets into the journal + if (cur->is_auth() && cur->last == CEPH_NOSNAP && + mdcache->open_file_table.should_log_open(cur)) { + EOpen *le = new EOpen(mds->mdlog); + mdlog->start_entry(le); + le->add_clean_inode(cur); + mdlog->submit_entry(le); + } + + // hit pop + if (cmode & CEPH_FILE_MODE_WR) + mds->balancer->hit_inode(cur, META_POP_IWR); + else + mds->balancer->hit_inode(cur, META_POP_IRD, + mdr->client_request->get_source().num()); + + CDentry *dn = 0; + if (req->get_dentry_wanted()) { + ceph_assert(mdr->dn[0].size()); + dn = mdr->dn[0].back(); + } + + mdr->tracei = cur; + mdr->tracedn = dn; + respond_to_request(mdr, 0); +} + +class C_MDS_openc_finish : public ServerLogContext { + CDentry *dn; + CInode *newi; +public: + C_MDS_openc_finish(Server *s, MDRequestRef& r, CDentry *d, CInode *ni) : + ServerLogContext(s, r), dn(d), newi(ni) {} + void finish(int r) override { + ceph_assert(r == 0); + + dn->pop_projected_linkage(); + + // dirty inode, dn, dir + newi->inode.version--; // a bit hacky, see C_MDS_mknod_finish + newi->mark_dirty(newi->inode.version+1, mdr->ls); + newi->mark_dirty_parent(mdr->ls, true); + + mdr->apply(); + + get_mds()->locker->share_inode_max_size(newi); + + MDRequestRef null_ref; + get_mds()->mdcache->send_dentry_link(dn, null_ref); + + get_mds()->balancer->hit_inode(newi, META_POP_IWR); + + server->respond_to_request(mdr, 0); + + ceph_assert(g_conf()->mds_kill_openc_at != 1); + } +}; + +/* This function takes responsibility for the passed mdr*/ +void Server::handle_client_openc(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + client_t client = mdr->get_client(); + + dout(7) << "open w/ O_CREAT on " << req->get_filepath() << dendl; + + int cmode = ceph_flags_to_mode(req->head.args.open.flags); + if (cmode < 0) { + respond_to_request(mdr, -EINVAL); + return; + } + + bool excl = req->head.args.open.flags & CEPH_O_EXCL; + + if (!excl) { + CF_MDS_MDRContextFactory cf(mdcache, mdr); + int r = mdcache->path_traverse(mdr, cf, req->get_filepath(), + &mdr->dn[0], NULL, MDS_TRAVERSE_FORWARD); + if (r > 0) return; + if (r == 0) { + // it existed. + handle_client_open(mdr); + return; + } + if (r < 0 && r != -ENOENT) { + if (r == -ESTALE) { + dout(10) << "FAIL on ESTALE but attempting recovery" << dendl; + MDSContext *c = new C_MDS_TryFindInode(this, mdr); + mdcache->find_ino_peers(req->get_filepath().get_ino(), c); + } else { + dout(10) << "FAIL on error " << r << dendl; + respond_to_request(mdr, r); + } + return; + } + } + + MutationImpl::LockOpVec lov; + file_layout_t *dir_layout = nullptr; + CDentry *dn = rdlock_path_xlock_dentry(mdr, 0, lov, + !excl, false, false, &dir_layout); + if (!dn) return; + if (mdr->snapid != CEPH_NOSNAP) { + respond_to_request(mdr, -EROFS); + return; + } + // set layout + file_layout_t layout; + if (dir_layout) + layout = *dir_layout; + else + layout = mdcache->default_file_layout; + + // What kind of client caps are required to complete this operation + uint64_t access = MAY_WRITE; + + const auto default_layout = layout; + + // fill in any special params from client + if (req->head.args.open.stripe_unit) + layout.stripe_unit = req->head.args.open.stripe_unit; + if (req->head.args.open.stripe_count) + layout.stripe_count = req->head.args.open.stripe_count; + if (req->head.args.open.object_size) + layout.object_size = req->head.args.open.object_size; + if (req->get_connection()->has_feature(CEPH_FEATURE_CREATEPOOLID) && + (__s32)req->head.args.open.pool >= 0) { + layout.pool_id = req->head.args.open.pool; + + // make sure we have as new a map as the client + if (req->get_mdsmap_epoch() > mds->mdsmap->get_epoch()) { + mds->wait_for_mdsmap(req->get_mdsmap_epoch(), new C_MDS_RetryRequest(mdcache, mdr)); + return; + } + } + + // If client doesn't have capability to modify layout pools, then + // only permit this request if the requested pool matches what the + // file would have inherited anyway from its parent. + if (default_layout != layout) { + access |= MAY_SET_VXATTR; + } + + if (!layout.is_valid()) { + dout(10) << " invalid initial file layout" << dendl; + respond_to_request(mdr, -EINVAL); + return; + } + if (!mds->mdsmap->is_data_pool(layout.pool_id)) { + dout(10) << " invalid data pool " << layout.pool_id << dendl; + respond_to_request(mdr, -EINVAL); + return; + } + + // created null dn. + CDir *dir = dn->get_dir(); + CInode *diri = dir->get_inode(); + lov.add_rdlock(&diri->authlock); + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + if (!check_access(mdr, diri, access)) + return; + + if (!check_fragment_space(mdr, dir)) + return; + + CDentry::linkage_t *dnl = dn->get_projected_linkage(); + + if (!dnl->is_null()) { + // it existed. + ceph_assert(req->head.args.open.flags & CEPH_O_EXCL); + dout(10) << "O_EXCL, target exists, failing with -EEXIST" << dendl; + mdr->tracei = dnl->get_inode(); + mdr->tracedn = dn; + respond_to_request(mdr, -EEXIST); + return; + } + + // create inode. + CInode *in = prepare_new_inode(mdr, dn->get_dir(), inodeno_t(req->head.ino), + req->head.args.open.mode | S_IFREG, &layout); + ceph_assert(in); + + // it's a file. + dn->push_projected_linkage(in); + + in->inode.version = dn->pre_dirty(); + if (layout.pool_id != mdcache->default_file_layout.pool_id) + in->inode.add_old_pool(mdcache->default_file_layout.pool_id); + in->inode.update_backtrace(); + in->inode.rstat.rfiles = 1; + + SnapRealm *realm = diri->find_snaprealm(); + snapid_t follows = mdcache->get_global_snaprealm()->get_newest_seq(); + ceph_assert(follows >= realm->get_newest_seq()); + + ceph_assert(dn->first == follows+1); + in->first = dn->first; + + // do the open + Capability *cap = mds->locker->issue_new_caps(in, cmode, mdr->session, realm, req->is_replay()); + in->authlock.set_state(LOCK_EXCL); + in->xattrlock.set_state(LOCK_EXCL); + + if (cap && (cmode & CEPH_FILE_MODE_WR)) { + in->inode.client_ranges[client].range.first = 0; + in->inode.client_ranges[client].range.last = in->inode.get_layout_size_increment(); + in->inode.client_ranges[client].follows = follows; + cap->mark_clientwriteable(); + } + + // prepare finisher + mdr->ls = mdlog->get_current_segment(); + EUpdate *le = new EUpdate(mdlog, "openc"); + mdlog->start_entry(le); + le->metablob.add_client_req(req->get_reqid(), req->get_oldest_client_tid()); + journal_allocated_inos(mdr, &le->metablob); + mdcache->predirty_journal_parents(mdr, &le->metablob, in, dn->get_dir(), PREDIRTY_PRIMARY|PREDIRTY_DIR, 1); + le->metablob.add_primary_dentry(dn, in, true, true, true); + + // make sure this inode gets into the journal + le->metablob.add_opened_ino(in->ino()); + + C_MDS_openc_finish *fin = new C_MDS_openc_finish(this, mdr, dn, in); + + if (mdr->client_request->get_connection()->has_feature(CEPH_FEATURE_REPLY_CREATE_INODE)) { + dout(10) << "adding ino to reply to indicate inode was created" << dendl; + // add the file created flag onto the reply if create_flags features is supported + encode(in->inode.ino, mdr->reply_extra_bl); + } + + journal_and_reply(mdr, in, dn, le, fin); + + // We hit_dir (via hit_inode) in our finish callback, but by then we might + // have overshot the split size (multiple opencs in flight), so here is + // an early chance to split the dir if this openc makes it oversized. + mds->balancer->maybe_fragment(dir, false); +} + + + +void Server::handle_client_readdir(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + Session *session = mds->get_session(req); + client_t client = req->get_source().num(); + MutationImpl::LockOpVec lov; + CInode *diri = rdlock_path_pin_ref(mdr, 0, lov, false, true); + if (!diri) return; + + // it's a directory, right? + if (!diri->is_dir()) { + // not a dir + dout(10) << "reply to " << *req << " readdir -ENOTDIR" << dendl; + respond_to_request(mdr, -ENOTDIR); + return; + } + + auto num_caps = session->get_num_caps(); + auto session_cap_acquisition = session->get_cap_acquisition(); + + if (num_caps > static_cast<uint64_t>(max_caps_per_client * max_caps_throttle_ratio) && session_cap_acquisition >= cap_acquisition_throttle) { + dout(20) << "readdir throttled. max_caps_per_client: " << max_caps_per_client << " num_caps: " << num_caps + << " session_cap_acquistion: " << session_cap_acquisition << " cap_acquisition_throttle: " << cap_acquisition_throttle << dendl; + if (logger) + logger->inc(l_mdss_cap_acquisition_throttle); + + mds->timer.add_event_after(caps_throttle_retry_request_timeout, new C_MDS_RetryRequest(mdcache, mdr)); + return; + } + + lov.add_rdlock(&diri->filelock); + lov.add_rdlock(&diri->dirfragtreelock); + + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + if (!check_access(mdr, diri, MAY_READ)) + return; + + // which frag? + frag_t fg = (__u32)req->head.args.readdir.frag; + unsigned req_flags = (__u32)req->head.args.readdir.flags; + string offset_str = req->get_path2(); + + __u32 offset_hash = 0; + if (!offset_str.empty()) + offset_hash = ceph_frag_value(diri->hash_dentry_name(offset_str)); + else + offset_hash = (__u32)req->head.args.readdir.offset_hash; + + dout(10) << " frag " << fg << " offset '" << offset_str << "'" + << " offset_hash " << offset_hash << " flags " << req_flags << dendl; + + // does the frag exist? + if (diri->dirfragtree[fg.value()] != fg) { + frag_t newfg; + if (req_flags & CEPH_READDIR_REPLY_BITFLAGS) { + if (fg.contains((unsigned)offset_hash)) { + newfg = diri->dirfragtree[offset_hash]; + } else { + // client actually wants next frag + newfg = diri->dirfragtree[fg.value()]; + } + } else { + offset_str.clear(); + newfg = diri->dirfragtree[fg.value()]; + } + dout(10) << " adjust frag " << fg << " -> " << newfg << " " << diri->dirfragtree << dendl; + fg = newfg; + } + + CDir *dir = try_open_auth_dirfrag(diri, fg, mdr); + if (!dir) return; + + // ok! + dout(10) << "handle_client_readdir on " << *dir << dendl; + ceph_assert(dir->is_auth()); + + if (!dir->is_complete()) { + if (dir->is_frozen()) { + dout(7) << "dir is frozen " << *dir << dendl; + mds->locker->drop_locks(mdr.get()); + mdr->drop_local_auth_pins(); + dir->add_waiter(CDir::WAIT_UNFREEZE, new C_MDS_RetryRequest(mdcache, mdr)); + return; + } + // fetch + dout(10) << " incomplete dir contents for readdir on " << *dir << ", fetching" << dendl; + dir->fetch(new C_MDS_RetryRequest(mdcache, mdr), true); + return; + } + +#ifdef MDS_VERIFY_FRAGSTAT + dir->verify_fragstat(); +#endif + + utime_t now = ceph_clock_now(); + mdr->set_mds_stamp(now); + + snapid_t snapid = mdr->snapid; + dout(10) << "snapid " << snapid << dendl; + + SnapRealm *realm = diri->find_snaprealm(); + + unsigned max = req->head.args.readdir.max_entries; + if (!max) + max = dir->get_num_any(); // whatever, something big. + unsigned max_bytes = req->head.args.readdir.max_bytes; + if (!max_bytes) + // make sure at least one item can be encoded + max_bytes = (512 << 10) + g_conf()->mds_max_xattr_pairs_size; + + // start final blob + bufferlist dirbl; + DirStat ds; + ds.frag = dir->get_frag(); + ds.auth = dir->get_dir_auth().first; + if (dir->is_auth() && !mdcache->forward_all_reqs_to_auth()) + dir->get_dist_spec(ds.dist, mds->get_nodeid()); + + dir->encode_dirstat(dirbl, mdr->session->info, ds); + + // count bytes available. + // this isn't perfect, but we should capture the main variable/unbounded size items! + int front_bytes = dirbl.length() + sizeof(__u32) + sizeof(__u8)*2; + int bytes_left = max_bytes - front_bytes; + bytes_left -= realm->get_snap_trace().length(); + + // build dir contents + bufferlist dnbl; + __u32 numfiles = 0; + bool start = !offset_hash && offset_str.empty(); + // skip all dns < dentry_key_t(snapid, offset_str, offset_hash) + dentry_key_t skip_key(snapid, offset_str.c_str(), offset_hash); + auto it = start ? dir->begin() : dir->lower_bound(skip_key); + bool end = (it == dir->end()); + for (; !end && numfiles < max; end = (it == dir->end())) { + CDentry *dn = it->second; + ++it; + + if (dn->state_test(CDentry::STATE_PURGING)) + continue; + + bool dnp = dn->use_projected(client, mdr); + CDentry::linkage_t *dnl = dnp ? dn->get_projected_linkage() : dn->get_linkage(); + + if (dnl->is_null()) + continue; + + if (dn->last < snapid || dn->first > snapid) { + dout(20) << "skipping non-overlapping snap " << *dn << dendl; + continue; + } + + if (!start) { + dentry_key_t offset_key(dn->last, offset_str.c_str(), offset_hash); + if (!(offset_key < dn->key())) + continue; + } + + CInode *in = dnl->get_inode(); + + if (in && in->ino() == CEPH_INO_CEPH) + continue; + + // remote link? + // better for the MDS to do the work, if we think the client will stat any of these files. + if (dnl->is_remote() && !in) { + in = mdcache->get_inode(dnl->get_remote_ino()); + if (in) { + dn->link_remote(dnl, in); + } else if (dn->state_test(CDentry::STATE_BADREMOTEINO)) { + dout(10) << "skipping bad remote ino on " << *dn << dendl; + continue; + } else { + // touch everything i _do_ have + for (auto &p : *dir) { + if (!p.second->get_linkage()->is_null()) + mdcache->lru.lru_touch(p.second); + } + + // already issued caps and leases, reply immediately. + if (dnbl.length() > 0) { + mdcache->open_remote_dentry(dn, dnp, new C_MDSInternalNoop); + dout(10) << " open remote dentry after caps were issued, stopping at " + << dnbl.length() << " < " << bytes_left << dendl; + break; + } + + mds->locker->drop_locks(mdr.get()); + mdr->drop_local_auth_pins(); + mdcache->open_remote_dentry(dn, dnp, new C_MDS_RetryRequest(mdcache, mdr)); + return; + } + } + ceph_assert(in); + + if ((int)(dnbl.length() + dn->get_name().length() + sizeof(__u32) + sizeof(LeaseStat)) > bytes_left) { + dout(10) << " ran out of room, stopping at " << dnbl.length() << " < " << bytes_left << dendl; + break; + } + + unsigned start_len = dnbl.length(); + + // dentry + dout(12) << "including dn " << *dn << dendl; + encode(dn->get_name(), dnbl); + mds->locker->issue_client_lease(dn, client, dnbl, now, mdr->session); + + // inode + dout(12) << "including inode " << *in << dendl; + int r = in->encode_inodestat(dnbl, mdr->session, realm, snapid, bytes_left - (int)dnbl.length()); + if (r < 0) { + // chop off dn->name, lease + dout(10) << " ran out of room, stopping at " << start_len << " < " << bytes_left << dendl; + bufferlist keep; + keep.substr_of(dnbl, 0, start_len); + dnbl.swap(keep); + break; + } + ceph_assert(r >= 0); + numfiles++; + + // touch dn + mdcache->lru.lru_touch(dn); + } + + session->touch_readdir_cap(numfiles); + + __u16 flags = 0; + if (end) { + flags = CEPH_READDIR_FRAG_END; + if (start) + flags |= CEPH_READDIR_FRAG_COMPLETE; // FIXME: what purpose does this serve + } + // client only understand END and COMPLETE flags ? + if (req_flags & CEPH_READDIR_REPLY_BITFLAGS) { + flags |= CEPH_READDIR_HASH_ORDER | CEPH_READDIR_OFFSET_HASH; + } + + // finish final blob + encode(numfiles, dirbl); + encode(flags, dirbl); + dirbl.claim_append(dnbl); + + // yay, reply + dout(10) << "reply to " << *req << " readdir num=" << numfiles + << " bytes=" << dirbl.length() + << " start=" << (int)start + << " end=" << (int)end + << dendl; + mdr->reply_extra_bl = dirbl; + + // bump popularity. NOTE: this doesn't quite capture it. + mds->balancer->hit_dir(dir, META_POP_IRD, -1, numfiles); + + // reply + mdr->tracei = diri; + respond_to_request(mdr, 0); +} + + + +// =============================================================================== +// INODE UPDATES + + +/* + * finisher for basic inode updates + */ +class C_MDS_inode_update_finish : public ServerLogContext { + CInode *in; + bool truncating_smaller, changed_ranges, adjust_realm; +public: + C_MDS_inode_update_finish(Server *s, MDRequestRef& r, CInode *i, + bool sm=false, bool cr=false, bool ar=false) : + ServerLogContext(s, r), in(i), + truncating_smaller(sm), changed_ranges(cr), adjust_realm(ar) { } + void finish(int r) override { + ceph_assert(r == 0); + + int snap_op = (in->snaprealm ? CEPH_SNAP_OP_UPDATE : CEPH_SNAP_OP_SPLIT); + + // apply + in->pop_and_dirty_projected_inode(mdr->ls); + mdr->apply(); + + MDSRank *mds = get_mds(); + + // notify any clients + if (truncating_smaller && in->inode.is_truncating()) { + mds->locker->issue_truncate(in); + mds->mdcache->truncate_inode(in, mdr->ls); + } + + if (adjust_realm) { + mds->mdcache->send_snap_update(in, 0, snap_op); + mds->mdcache->do_realm_invalidate_and_update_notify(in, snap_op); + } + + get_mds()->balancer->hit_inode(in, META_POP_IWR); + + server->respond_to_request(mdr, 0); + + if (changed_ranges) + get_mds()->locker->share_inode_max_size(in); + } +}; + +void Server::handle_client_file_setlock(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + MutationImpl::LockOpVec lov; + + // get the inode to operate on, and set up any locks needed for that + CInode *cur = rdlock_path_pin_ref(mdr, 0, lov, true); + if (!cur) + return; + + lov.add_xlock(&cur->flocklock); + /* acquire_locks will return true if it gets the locks. If it fails, + it will redeliver this request at a later date, so drop the request. + */ + if (!mds->locker->acquire_locks(mdr, lov)) { + dout(10) << "handle_client_file_setlock could not get locks!" << dendl; + return; + } + + // copy the lock change into a ceph_filelock so we can store/apply it + ceph_filelock set_lock; + set_lock.start = req->head.args.filelock_change.start; + set_lock.length = req->head.args.filelock_change.length; + set_lock.client = req->get_orig_source().num(); + set_lock.owner = req->head.args.filelock_change.owner; + set_lock.pid = req->head.args.filelock_change.pid; + set_lock.type = req->head.args.filelock_change.type; + bool will_wait = req->head.args.filelock_change.wait; + + dout(10) << "handle_client_file_setlock: " << set_lock << dendl; + + ceph_lock_state_t *lock_state = NULL; + bool interrupt = false; + + // get the appropriate lock state + switch (req->head.args.filelock_change.rule) { + case CEPH_LOCK_FLOCK_INTR: + interrupt = true; + // fall-thru + case CEPH_LOCK_FLOCK: + lock_state = cur->get_flock_lock_state(); + break; + + case CEPH_LOCK_FCNTL_INTR: + interrupt = true; + // fall-thru + case CEPH_LOCK_FCNTL: + lock_state = cur->get_fcntl_lock_state(); + break; + + default: + dout(10) << "got unknown lock type " << set_lock.type + << ", dropping request!" << dendl; + respond_to_request(mdr, -EOPNOTSUPP); + return; + } + + dout(10) << " state prior to lock change: " << *lock_state << dendl; + if (CEPH_LOCK_UNLOCK == set_lock.type) { + list<ceph_filelock> activated_locks; + MDSContext::vec waiters; + if (lock_state->is_waiting(set_lock)) { + dout(10) << " unlock removing waiting lock " << set_lock << dendl; + lock_state->remove_waiting(set_lock); + cur->take_waiting(CInode::WAIT_FLOCK, waiters); + } else if (!interrupt) { + dout(10) << " unlock attempt on " << set_lock << dendl; + lock_state->remove_lock(set_lock, activated_locks); + cur->take_waiting(CInode::WAIT_FLOCK, waiters); + } + mds->queue_waiters(waiters); + + respond_to_request(mdr, 0); + } else { + dout(10) << " lock attempt on " << set_lock << dendl; + bool deadlock = false; + if (mdr->more()->flock_was_waiting && + !lock_state->is_waiting(set_lock)) { + dout(10) << " was waiting for lock but not anymore, must have been canceled " << set_lock << dendl; + respond_to_request(mdr, -EINTR); + } else if (!lock_state->add_lock(set_lock, will_wait, mdr->more()->flock_was_waiting, &deadlock)) { + dout(10) << " it failed on this attempt" << dendl; + // couldn't set lock right now + if (deadlock) { + respond_to_request(mdr, -EDEADLK); + } else if (!will_wait) { + respond_to_request(mdr, -EWOULDBLOCK); + } else { + dout(10) << " added to waiting list" << dendl; + ceph_assert(lock_state->is_waiting(set_lock)); + mdr->more()->flock_was_waiting = true; + mds->locker->drop_locks(mdr.get()); + mdr->drop_local_auth_pins(); + mdr->mark_event("failed to add lock, waiting"); + mdr->mark_nowarn(); + cur->add_waiter(CInode::WAIT_FLOCK, new C_MDS_RetryRequest(mdcache, mdr)); + } + } else + respond_to_request(mdr, 0); + } + dout(10) << " state after lock change: " << *lock_state << dendl; +} + +void Server::handle_client_file_readlock(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + MutationImpl::LockOpVec lov; + + // get the inode to operate on, and set up any locks needed for that + CInode *cur = rdlock_path_pin_ref(mdr, 0, lov, true); + if (!cur) + return; + + /* acquire_locks will return true if it gets the locks. If it fails, + it will redeliver this request at a later date, so drop the request. + */ + lov.add_rdlock(&cur->flocklock); + if (!mds->locker->acquire_locks(mdr, lov)) { + dout(10) << "handle_client_file_readlock could not get locks!" << dendl; + return; + } + + // copy the lock change into a ceph_filelock so we can store/apply it + ceph_filelock checking_lock; + checking_lock.start = req->head.args.filelock_change.start; + checking_lock.length = req->head.args.filelock_change.length; + checking_lock.client = req->get_orig_source().num(); + checking_lock.owner = req->head.args.filelock_change.owner; + checking_lock.pid = req->head.args.filelock_change.pid; + checking_lock.type = req->head.args.filelock_change.type; + + // get the appropriate lock state + ceph_lock_state_t *lock_state = NULL; + switch (req->head.args.filelock_change.rule) { + case CEPH_LOCK_FLOCK: + lock_state = cur->get_flock_lock_state(); + break; + + case CEPH_LOCK_FCNTL: + lock_state = cur->get_fcntl_lock_state(); + break; + + default: + dout(10) << "got unknown lock type " << checking_lock.type << dendl; + respond_to_request(mdr, -EINVAL); + return; + } + lock_state->look_for_lock(checking_lock); + + bufferlist lock_bl; + encode(checking_lock, lock_bl); + + mdr->reply_extra_bl = lock_bl; + respond_to_request(mdr, 0); +} + +void Server::handle_client_setattr(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + MutationImpl::LockOpVec lov; + CInode *cur = rdlock_path_pin_ref(mdr, 0, lov, true); + if (!cur) return; + + if (mdr->snapid != CEPH_NOSNAP) { + respond_to_request(mdr, -EROFS); + return; + } + if (cur->ino() < MDS_INO_SYSTEM_BASE && !cur->is_base()) { + respond_to_request(mdr, -EPERM); + return; + } + + __u32 mask = req->head.args.setattr.mask; + __u32 access_mask = MAY_WRITE; + + // xlock inode + if (mask & (CEPH_SETATTR_MODE|CEPH_SETATTR_UID|CEPH_SETATTR_GID|CEPH_SETATTR_BTIME|CEPH_SETATTR_KILL_SGUID)) + lov.add_xlock(&cur->authlock); + if (mask & (CEPH_SETATTR_MTIME|CEPH_SETATTR_ATIME|CEPH_SETATTR_SIZE)) + lov.add_xlock(&cur->filelock); + if (mask & CEPH_SETATTR_CTIME) + lov.add_wrlock(&cur->versionlock); + + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + if ((mask & CEPH_SETATTR_UID) && (cur->inode.uid != req->head.args.setattr.uid)) + access_mask |= MAY_CHOWN; + + if ((mask & CEPH_SETATTR_GID) && (cur->inode.gid != req->head.args.setattr.gid)) + access_mask |= MAY_CHGRP; + + if (!check_access(mdr, cur, access_mask)) + return; + + // trunc from bigger -> smaller? + auto pip = cur->get_projected_inode(); + + uint64_t old_size = std::max<uint64_t>(pip->size, req->head.args.setattr.old_size); + + // ENOSPC on growing file while full, but allow shrinks + if (is_full && req->head.args.setattr.size > old_size) { + dout(20) << __func__ << ": full, responding ENOSPC to setattr with larger size" << dendl; + respond_to_request(mdr, -ENOSPC); + return; + } + + bool truncating_smaller = false; + if (mask & CEPH_SETATTR_SIZE) { + truncating_smaller = req->head.args.setattr.size < old_size; + if (truncating_smaller && pip->is_truncating()) { + dout(10) << " waiting for pending truncate from " << pip->truncate_from + << " to " << pip->truncate_size << " to complete on " << *cur << dendl; + mds->locker->drop_locks(mdr.get()); + mdr->drop_local_auth_pins(); + cur->add_waiter(CInode::WAIT_TRUNC, new C_MDS_RetryRequest(mdcache, mdr)); + return; + } + } + + bool changed_ranges = false; + + // project update + mdr->ls = mdlog->get_current_segment(); + EUpdate *le = new EUpdate(mdlog, "setattr"); + mdlog->start_entry(le); + + auto &pi = cur->project_inode(); + + if (mask & CEPH_SETATTR_UID) + pi.inode.uid = req->head.args.setattr.uid; + if (mask & CEPH_SETATTR_GID) + pi.inode.gid = req->head.args.setattr.gid; + + if (mask & CEPH_SETATTR_MODE) + pi.inode.mode = (pi.inode.mode & ~07777) | (req->head.args.setattr.mode & 07777); + else if ((mask & (CEPH_SETATTR_UID|CEPH_SETATTR_GID|CEPH_SETATTR_KILL_SGUID)) && + S_ISREG(pi.inode.mode) && + (pi.inode.mode & (S_IXUSR|S_IXGRP|S_IXOTH))) { + pi.inode.mode &= ~(S_ISUID|S_ISGID); + } + + if (mask & CEPH_SETATTR_MTIME) + pi.inode.mtime = req->head.args.setattr.mtime; + if (mask & CEPH_SETATTR_ATIME) + pi.inode.atime = req->head.args.setattr.atime; + if (mask & CEPH_SETATTR_BTIME) + pi.inode.btime = req->head.args.setattr.btime; + if (mask & (CEPH_SETATTR_ATIME | CEPH_SETATTR_MTIME | CEPH_SETATTR_BTIME)) + pi.inode.time_warp_seq++; // maybe not a timewarp, but still a serialization point. + if (mask & CEPH_SETATTR_SIZE) { + if (truncating_smaller) { + pi.inode.truncate(old_size, req->head.args.setattr.size); + le->metablob.add_truncate_start(cur->ino()); + } else { + pi.inode.size = req->head.args.setattr.size; + pi.inode.rstat.rbytes = pi.inode.size; + } + pi.inode.mtime = mdr->get_op_stamp(); + + // adjust client's max_size? + CInode::mempool_inode::client_range_map new_ranges; + bool max_increased = false; + mds->locker->calc_new_client_ranges(cur, pi.inode.size, true, &new_ranges, &max_increased); + if (pi.inode.client_ranges != new_ranges) { + dout(10) << " client_ranges " << pi.inode.client_ranges << " -> " << new_ranges << dendl; + pi.inode.client_ranges = new_ranges; + changed_ranges = true; + } + } + + pi.inode.version = cur->pre_dirty(); + pi.inode.ctime = mdr->get_op_stamp(); + if (mdr->get_op_stamp() > pi.inode.rstat.rctime) + pi.inode.rstat.rctime = mdr->get_op_stamp(); + pi.inode.change_attr++; + + // log + wait + le->metablob.add_client_req(req->get_reqid(), req->get_oldest_client_tid()); + mdcache->predirty_journal_parents(mdr, &le->metablob, cur, 0, PREDIRTY_PRIMARY); + mdcache->journal_dirty_inode(mdr.get(), &le->metablob, cur); + + journal_and_reply(mdr, cur, 0, le, new C_MDS_inode_update_finish(this, mdr, cur, + truncating_smaller, changed_ranges)); + + // flush immediately if there are readers/writers waiting + if (mdr->is_xlocked(&cur->filelock) && + (cur->get_caps_wanted() & (CEPH_CAP_FILE_RD|CEPH_CAP_FILE_WR))) + mds->mdlog->flush(); +} + +/* Takes responsibility for mdr */ +void Server::do_open_truncate(MDRequestRef& mdr, int cmode) +{ + CInode *in = mdr->in[0]; + client_t client = mdr->get_client(); + ceph_assert(in); + + dout(10) << "do_open_truncate " << *in << dendl; + + SnapRealm *realm = in->find_snaprealm(); + Capability *cap = mds->locker->issue_new_caps(in, cmode, mdr->session, realm, mdr->client_request->is_replay()); + + mdr->ls = mdlog->get_current_segment(); + EUpdate *le = new EUpdate(mdlog, "open_truncate"); + mdlog->start_entry(le); + + // prepare + auto &pi = in->project_inode(); + pi.inode.version = in->pre_dirty(); + pi.inode.mtime = pi.inode.ctime = mdr->get_op_stamp(); + if (mdr->get_op_stamp() > pi.inode.rstat.rctime) + pi.inode.rstat.rctime = mdr->get_op_stamp(); + pi.inode.change_attr++; + + uint64_t old_size = std::max<uint64_t>(pi.inode.size, mdr->client_request->head.args.open.old_size); + if (old_size > 0) { + pi.inode.truncate(old_size, 0); + le->metablob.add_truncate_start(in->ino()); + } + + bool changed_ranges = false; + if (cap && (cmode & CEPH_FILE_MODE_WR)) { + pi.inode.client_ranges[client].range.first = 0; + pi.inode.client_ranges[client].range.last = pi.inode.get_layout_size_increment(); + pi.inode.client_ranges[client].follows = realm->get_newest_seq(); + changed_ranges = true; + cap->mark_clientwriteable(); + } + + le->metablob.add_client_req(mdr->reqid, mdr->client_request->get_oldest_client_tid()); + + mdcache->predirty_journal_parents(mdr, &le->metablob, in, 0, PREDIRTY_PRIMARY); + mdcache->journal_dirty_inode(mdr.get(), &le->metablob, in); + + // make sure ino gets into the journal + le->metablob.add_opened_ino(in->ino()); + + mdr->o_trunc = true; + + CDentry *dn = 0; + if (mdr->client_request->get_dentry_wanted()) { + ceph_assert(mdr->dn[0].size()); + dn = mdr->dn[0].back(); + } + + journal_and_reply(mdr, in, dn, le, new C_MDS_inode_update_finish(this, mdr, in, old_size > 0, + changed_ranges)); + // Although the `open` part can give an early reply, the truncation won't + // happen until our EUpdate is persistent, to give the client a prompt + // response we must also flush that event. + mdlog->flush(); +} + + +/* This function cleans up the passed mdr */ +void Server::handle_client_setlayout(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + MutationImpl::LockOpVec lov; + CInode *cur = rdlock_path_pin_ref(mdr, 0, lov, true); + if (!cur) return; + + if (mdr->snapid != CEPH_NOSNAP) { + respond_to_request(mdr, -EROFS); + return; + } + if (!cur->is_file()) { + respond_to_request(mdr, -EINVAL); + return; + } + if (cur->get_projected_inode()->size || + cur->get_projected_inode()->truncate_seq > 1) { + respond_to_request(mdr, -ENOTEMPTY); + return; + } + + // validate layout + file_layout_t layout = cur->get_projected_inode()->layout; + // save existing layout for later + const auto old_layout = layout; + + int access = MAY_WRITE; + + if (req->head.args.setlayout.layout.fl_object_size > 0) + layout.object_size = req->head.args.setlayout.layout.fl_object_size; + if (req->head.args.setlayout.layout.fl_stripe_unit > 0) + layout.stripe_unit = req->head.args.setlayout.layout.fl_stripe_unit; + if (req->head.args.setlayout.layout.fl_stripe_count > 0) + layout.stripe_count=req->head.args.setlayout.layout.fl_stripe_count; + if (req->head.args.setlayout.layout.fl_pg_pool > 0) { + layout.pool_id = req->head.args.setlayout.layout.fl_pg_pool; + + // make sure we have as new a map as the client + if (req->get_mdsmap_epoch() > mds->mdsmap->get_epoch()) { + mds->wait_for_mdsmap(req->get_mdsmap_epoch(), new C_MDS_RetryRequest(mdcache, mdr)); + return; + } + } + + // Don't permit layout modifications without 'p' caps + if (layout != old_layout) { + access |= MAY_SET_VXATTR; + } + + if (!layout.is_valid()) { + dout(10) << "bad layout" << dendl; + respond_to_request(mdr, -EINVAL); + return; + } + if (!mds->mdsmap->is_data_pool(layout.pool_id)) { + dout(10) << " invalid data pool " << layout.pool_id << dendl; + respond_to_request(mdr, -EINVAL); + return; + } + + lov.add_xlock(&cur->filelock); + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + if (!check_access(mdr, cur, access)) + return; + + // project update + auto &pi = cur->project_inode(); + pi.inode.layout = layout; + // add the old pool to the inode + pi.inode.add_old_pool(old_layout.pool_id); + pi.inode.version = cur->pre_dirty(); + pi.inode.ctime = mdr->get_op_stamp(); + if (mdr->get_op_stamp() > pi.inode.rstat.rctime) + pi.inode.rstat.rctime = mdr->get_op_stamp(); + pi.inode.change_attr++; + + // log + wait + mdr->ls = mdlog->get_current_segment(); + EUpdate *le = new EUpdate(mdlog, "setlayout"); + mdlog->start_entry(le); + le->metablob.add_client_req(req->get_reqid(), req->get_oldest_client_tid()); + mdcache->predirty_journal_parents(mdr, &le->metablob, cur, 0, PREDIRTY_PRIMARY); + mdcache->journal_dirty_inode(mdr.get(), &le->metablob, cur); + + journal_and_reply(mdr, cur, 0, le, new C_MDS_inode_update_finish(this, mdr, cur)); +} + +void Server::handle_client_setdirlayout(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + MutationImpl::LockOpVec lov; + file_layout_t *dir_layout = nullptr; + CInode *cur = rdlock_path_pin_ref(mdr, 0, lov, true, false, &dir_layout); + if (!cur) return; + + if (mdr->snapid != CEPH_NOSNAP) { + respond_to_request(mdr, -EROFS); + return; + } + + if (!cur->is_dir()) { + respond_to_request(mdr, -ENOTDIR); + return; + } + + lov.add_xlock(&cur->policylock); + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + // validate layout + const auto old_pi = cur->get_projected_inode(); + file_layout_t layout; + if (old_pi->has_layout()) + layout = old_pi->layout; + else if (dir_layout) + layout = *dir_layout; + else + layout = mdcache->default_file_layout; + + // Level of access required to complete + int access = MAY_WRITE; + + const auto old_layout = layout; + + if (req->head.args.setlayout.layout.fl_object_size > 0) + layout.object_size = req->head.args.setlayout.layout.fl_object_size; + if (req->head.args.setlayout.layout.fl_stripe_unit > 0) + layout.stripe_unit = req->head.args.setlayout.layout.fl_stripe_unit; + if (req->head.args.setlayout.layout.fl_stripe_count > 0) + layout.stripe_count=req->head.args.setlayout.layout.fl_stripe_count; + if (req->head.args.setlayout.layout.fl_pg_pool > 0) { + layout.pool_id = req->head.args.setlayout.layout.fl_pg_pool; + // make sure we have as new a map as the client + if (req->get_mdsmap_epoch() > mds->mdsmap->get_epoch()) { + mds->wait_for_mdsmap(req->get_mdsmap_epoch(), new C_MDS_RetryRequest(mdcache, mdr)); + return; + } + } + + if (layout != old_layout) { + access |= MAY_SET_VXATTR; + } + + if (!layout.is_valid()) { + dout(10) << "bad layout" << dendl; + respond_to_request(mdr, -EINVAL); + return; + } + if (!mds->mdsmap->is_data_pool(layout.pool_id)) { + dout(10) << " invalid data pool " << layout.pool_id << dendl; + respond_to_request(mdr, -EINVAL); + return; + } + + if (!check_access(mdr, cur, access)) + return; + + auto &pi = cur->project_inode(); + pi.inode.layout = layout; + pi.inode.version = cur->pre_dirty(); + + // log + wait + mdr->ls = mdlog->get_current_segment(); + EUpdate *le = new EUpdate(mdlog, "setlayout"); + mdlog->start_entry(le); + le->metablob.add_client_req(req->get_reqid(), req->get_oldest_client_tid()); + mdcache->predirty_journal_parents(mdr, &le->metablob, cur, 0, PREDIRTY_PRIMARY); + mdcache->journal_dirty_inode(mdr.get(), &le->metablob, cur); + + mdr->no_early_reply = true; + journal_and_reply(mdr, cur, 0, le, new C_MDS_inode_update_finish(this, mdr, cur)); +} + +// XATTRS + +int Server::parse_layout_vxattr(string name, string value, const OSDMap& osdmap, + file_layout_t *layout, bool validate) +{ + dout(20) << "parse_layout_vxattr name " << name << " value '" << value << "'" << dendl; + try { + if (name == "layout") { + string::iterator begin = value.begin(); + string::iterator end = value.end(); + keys_and_values<string::iterator> p; // create instance of parser + std::map<string, string> m; // map to receive results + if (!qi::parse(begin, end, p, m)) { // returns true if successful + return -EINVAL; + } + string left(begin, end); + dout(10) << " parsed " << m << " left '" << left << "'" << dendl; + if (begin != end) + return -EINVAL; + for (map<string,string>::iterator q = m.begin(); q != m.end(); ++q) { + // Skip validation on each attr, we do it once at the end (avoid + // rejecting intermediate states if the overall result is ok) + int r = parse_layout_vxattr(string("layout.") + q->first, q->second, + osdmap, layout, false); + if (r < 0) + return r; + } + } else if (name == "layout.object_size") { + layout->object_size = boost::lexical_cast<unsigned>(value); + } else if (name == "layout.stripe_unit") { + layout->stripe_unit = boost::lexical_cast<unsigned>(value); + } else if (name == "layout.stripe_count") { + layout->stripe_count = boost::lexical_cast<unsigned>(value); + } else if (name == "layout.pool") { + try { + layout->pool_id = boost::lexical_cast<unsigned>(value); + } catch (boost::bad_lexical_cast const&) { + int64_t pool = osdmap.lookup_pg_pool_name(value); + if (pool < 0) { + dout(10) << " unknown pool " << value << dendl; + return -ENOENT; + } + layout->pool_id = pool; + } + } else if (name == "layout.pool_namespace") { + layout->pool_ns = value; + } else { + dout(10) << " unknown layout vxattr " << name << dendl; + return -EINVAL; + } + } catch (boost::bad_lexical_cast const&) { + dout(10) << "bad vxattr value, unable to parse int for " << name << dendl; + return -EINVAL; + } + + if (validate && !layout->is_valid()) { + dout(10) << "bad layout" << dendl; + return -EINVAL; + } + if (!mds->mdsmap->is_data_pool(layout->pool_id)) { + dout(10) << " invalid data pool " << layout->pool_id << dendl; + return -EINVAL; + } + return 0; +} + +int Server::parse_quota_vxattr(string name, string value, quota_info_t *quota) +{ + dout(20) << "parse_quota_vxattr name " << name << " value '" << value << "'" << dendl; + try { + if (name == "quota") { + string::iterator begin = value.begin(); + string::iterator end = value.end(); + if (begin == end) { + // keep quota unchanged. (for create_quota_realm()) + return 0; + } + keys_and_values<string::iterator> p; // create instance of parser + std::map<string, string> m; // map to receive results + if (!qi::parse(begin, end, p, m)) { // returns true if successful + return -EINVAL; + } + string left(begin, end); + dout(10) << " parsed " << m << " left '" << left << "'" << dendl; + if (begin != end) + return -EINVAL; + for (map<string,string>::iterator q = m.begin(); q != m.end(); ++q) { + int r = parse_quota_vxattr(string("quota.") + q->first, q->second, quota); + if (r < 0) + return r; + } + } else if (name == "quota.max_bytes") { + int64_t q = boost::lexical_cast<int64_t>(value); + if (q < 0) + return -EINVAL; + quota->max_bytes = q; + } else if (name == "quota.max_files") { + int64_t q = boost::lexical_cast<int64_t>(value); + if (q < 0) + return -EINVAL; + quota->max_files = q; + } else { + dout(10) << " unknown quota vxattr " << name << dendl; + return -EINVAL; + } + } catch (boost::bad_lexical_cast const&) { + dout(10) << "bad vxattr value, unable to parse int for " << name << dendl; + return -EINVAL; + } + + if (!quota->is_valid()) { + dout(10) << "bad quota" << dendl; + return -EINVAL; + } + return 0; +} + +void Server::create_quota_realm(CInode *in) +{ + dout(10) << __func__ << " " << *in << dendl; + + auto req = MClientRequest::create(CEPH_MDS_OP_SETXATTR); + req->set_filepath(filepath(in->ino())); + req->set_string2("ceph.quota"); + // empty vxattr value + req->set_tid(mds->issue_tid()); + + mds->send_message_mds(req, in->authority().first); +} + +/* + * Verify that the file layout attribute carried by client + * is well-formatted. + * Return 0 on success, otherwise this function takes + * responsibility for the passed mdr. + */ +int Server::check_layout_vxattr(MDRequestRef& mdr, + string name, + string value, + file_layout_t *layout) +{ + const MClientRequest::const_ref &req = mdr->client_request; + epoch_t epoch; + int r; + + mds->objecter->with_osdmap([&](const OSDMap& osdmap) { + r = parse_layout_vxattr(name, value, osdmap, layout); + epoch = osdmap.get_epoch(); + }); + + if (r == -ENOENT) { + + // we don't have the specified pool, make sure our map + // is newer than or as new as the client. + epoch_t req_epoch = req->get_osdmap_epoch(); + + if (req_epoch > epoch) { + + // well, our map is older. consult mds. + Context *fin = new C_IO_Wrapper(mds, new C_MDS_RetryRequest(mdcache, mdr)); + + if (!mds->objecter->wait_for_map(req_epoch, fin)) + return r; // wait, fin will retry this request later + + delete fin; + + // now we have at least as new a map as the client, try again. + mds->objecter->with_osdmap([&](const OSDMap& osdmap) { + r = parse_layout_vxattr(name, value, osdmap, layout); + epoch = osdmap.get_epoch(); + }); + + ceph_assert(epoch >= req_epoch); // otherwise wait_for_map() told a lie + + } else if (req_epoch == 0 && !mdr->waited_for_osdmap) { + + // For compatibility with client w/ old code, we still need get the + // latest map. One day if COMPACT_VERSION of MClientRequest >=3, + // we can remove those code. + mdr->waited_for_osdmap = true; + mds->objecter->wait_for_latest_osdmap(new C_IO_Wrapper( + mds, new C_MDS_RetryRequest(mdcache, mdr))); + return r; + } + } + + if (r < 0) { + + if (r == -ENOENT) + r = -EINVAL; + + respond_to_request(mdr, r); + return r; + } + + // all is well + return 0; +} + +void Server::handle_set_vxattr(MDRequestRef& mdr, CInode *cur, + file_layout_t *dir_layout, + MutationImpl::LockOpVec& lov) +{ + const MClientRequest::const_ref &req = mdr->client_request; + string name(req->get_path2()); + bufferlist bl = req->get_data(); + string value (bl.c_str(), bl.length()); + dout(10) << "handle_set_vxattr " << name + << " val " << value.length() + << " bytes on " << *cur + << dendl; + + CInode::mempool_inode *pip = nullptr; + string rest; + + if (!check_access(mdr, cur, MAY_SET_VXATTR)) { + return; + } + + bool adjust_realm = false; + if (name.compare(0, 15, "ceph.dir.layout") == 0) { + if (!cur->is_dir()) { + respond_to_request(mdr, -EINVAL); + return; + } + + file_layout_t layout; + if (cur->get_projected_inode()->has_layout()) + layout = cur->get_projected_inode()->layout; + else if (dir_layout) + layout = *dir_layout; + else + layout = mdcache->default_file_layout; + + rest = name.substr(name.find("layout")); + if (check_layout_vxattr(mdr, rest, value, &layout) < 0) + return; + + lov.add_xlock(&cur->policylock); + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + auto &pi = cur->project_inode(); + pi.inode.layout = layout; + mdr->no_early_reply = true; + pip = &pi.inode; + } else if (name.compare(0, 16, "ceph.file.layout") == 0) { + if (!cur->is_file()) { + respond_to_request(mdr, -EINVAL); + return; + } + if (cur->get_projected_inode()->size || + cur->get_projected_inode()->truncate_seq > 1) { + respond_to_request(mdr, -ENOTEMPTY); + return; + } + file_layout_t layout = cur->get_projected_inode()->layout; + rest = name.substr(name.find("layout")); + if (check_layout_vxattr(mdr, rest, value, &layout) < 0) + return; + + lov.add_xlock(&cur->filelock); + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + auto &pi = cur->project_inode(); + int64_t old_pool = pi.inode.layout.pool_id; + pi.inode.add_old_pool(old_pool); + pi.inode.layout = layout; + pip = &pi.inode; + } else if (name.compare(0, 10, "ceph.quota") == 0) { + if (!cur->is_dir() || cur->is_root()) { + respond_to_request(mdr, -EINVAL); + return; + } + + quota_info_t quota = cur->get_projected_inode()->quota; + + rest = name.substr(name.find("quota")); + int r = parse_quota_vxattr(rest, value, "a); + if (r < 0) { + respond_to_request(mdr, r); + return; + } + + lov.add_xlock(&cur->policylock); + if (quota.is_enable() && !cur->get_projected_srnode()) { + lov.add_xlock(&cur->snaplock); + adjust_realm = true; + } + + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + if (cur->get_projected_inode()->quota == quota) { + respond_to_request(mdr, 0); + return; + } + + auto &pi = cur->project_inode(false, adjust_realm); + pi.inode.quota = quota; + + if (adjust_realm) + pi.snapnode->created = pi.snapnode->seq = cur->find_snaprealm()->get_newest_seq(); + + mdr->no_early_reply = true; + pip = &pi.inode; + + client_t exclude_ct = mdr->get_client(); + mdcache->broadcast_quota_to_client(cur, exclude_ct, true); + } else if (name == "ceph.dir.subvolume"sv) { + if (!cur->is_dir()) { + respond_to_request(mdr, -EINVAL); + return; + } + + bool val; + try { + val = boost::lexical_cast<bool>(value); + } catch (boost::bad_lexical_cast const&) { + dout(10) << "bad vxattr value, unable to parse bool for " << name << dendl; + respond_to_request(mdr, -EINVAL); + return; + } + + lov.add_xlock(&cur->policylock); + lov.add_xlock(&cur->snaplock); + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + SnapRealm *realm = cur->find_snaprealm(); + if (val) { + inodeno_t subvol_ino = realm->get_subvolume_ino(); + // can't create subvolume inside another subvolume + if (subvol_ino && subvol_ino != cur->ino()) { + respond_to_request(mdr, -EINVAL); + return; + } + } + + const auto srnode = cur->get_projected_srnode(); + if (val == (srnode && srnode->is_subvolume())) { + respond_to_request(mdr, 0); + return; + } + + auto& pi = cur->project_inode(false, true); + if (!srnode) + pi.snapnode->created = pi.snapnode->seq = realm->get_newest_seq(); + if (val) + pi.snapnode->mark_subvolume(); + else + pi.snapnode->clear_subvolume(); + + mdr->no_early_reply = true; + pip = &pi.inode; + adjust_realm = true; + } else if (name == "ceph.dir.pin"sv) { + if (!cur->is_dir() || cur->is_root()) { + respond_to_request(mdr, -EINVAL); + return; + } + + mds_rank_t rank; + try { + rank = boost::lexical_cast<mds_rank_t>(value); + if (rank < 0) rank = MDS_RANK_NONE; + } catch (boost::bad_lexical_cast const&) { + dout(10) << "bad vxattr value, unable to parse int for " << name << dendl; + respond_to_request(mdr, -EINVAL); + return; + } + + lov.add_xlock(&cur->policylock); + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + auto &pi = cur->project_inode(); + cur->set_export_pin(rank); + pip = &pi.inode; + } else { + dout(10) << " unknown vxattr " << name << dendl; + respond_to_request(mdr, -EINVAL); + return; + } + + pip->change_attr++; + pip->ctime = mdr->get_op_stamp(); + if (mdr->get_op_stamp() > pip->rstat.rctime) + pip->rstat.rctime = mdr->get_op_stamp(); + pip->version = cur->pre_dirty(); + if (cur->is_file()) + pip->update_backtrace(); + + // log + wait + mdr->ls = mdlog->get_current_segment(); + EUpdate *le = new EUpdate(mdlog, "set vxattr layout"); + mdlog->start_entry(le); + le->metablob.add_client_req(req->get_reqid(), req->get_oldest_client_tid()); + mdcache->predirty_journal_parents(mdr, &le->metablob, cur, 0, PREDIRTY_PRIMARY); + mdcache->journal_dirty_inode(mdr.get(), &le->metablob, cur); + + journal_and_reply(mdr, cur, 0, le, new C_MDS_inode_update_finish(this, mdr, cur, + false, false, adjust_realm)); + return; +} + +void Server::handle_remove_vxattr(MDRequestRef& mdr, CInode *cur, + file_layout_t *dir_layout, + MutationImpl::LockOpVec& lov) +{ + const MClientRequest::const_ref &req = mdr->client_request; + string name(req->get_path2()); + + dout(10) << __func__ << " " << name << " on " << *cur << dendl; + + if (name == "ceph.dir.layout") { + if (!cur->is_dir()) { + respond_to_request(mdr, -ENODATA); + return; + } + if (cur->is_root()) { + dout(10) << "can't remove layout policy on the root directory" << dendl; + respond_to_request(mdr, -EINVAL); + return; + } + + if (!cur->get_projected_inode()->has_layout()) { + respond_to_request(mdr, -ENODATA); + return; + } + + lov.add_xlock(&cur->policylock); + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + auto &pi = cur->project_inode(); + pi.inode.clear_layout(); + pi.inode.version = cur->pre_dirty(); + + // log + wait + mdr->ls = mdlog->get_current_segment(); + EUpdate *le = new EUpdate(mdlog, "remove dir layout vxattr"); + mdlog->start_entry(le); + le->metablob.add_client_req(req->get_reqid(), req->get_oldest_client_tid()); + mdcache->predirty_journal_parents(mdr, &le->metablob, cur, 0, PREDIRTY_PRIMARY); + mdcache->journal_dirty_inode(mdr.get(), &le->metablob, cur); + + mdr->no_early_reply = true; + journal_and_reply(mdr, cur, 0, le, new C_MDS_inode_update_finish(this, mdr, cur)); + return; + } else if (name == "ceph.dir.layout.pool_namespace" + || name == "ceph.file.layout.pool_namespace") { + // Namespace is the only layout field that has a meaningful + // null/none value (empty string, means default layout). Is equivalent + // to a setxattr with empty string: pass through the empty payload of + // the rmxattr request to do this. + handle_set_vxattr(mdr, cur, dir_layout, lov); + return; + } + + respond_to_request(mdr, -ENODATA); +} + +class C_MDS_inode_xattr_update_finish : public ServerLogContext { + CInode *in; +public: + + C_MDS_inode_xattr_update_finish(Server *s, MDRequestRef& r, CInode *i) : + ServerLogContext(s, r), in(i) { } + void finish(int r) override { + ceph_assert(r == 0); + + // apply + in->pop_and_dirty_projected_inode(mdr->ls); + + mdr->apply(); + + get_mds()->balancer->hit_inode(in, META_POP_IWR); + + server->respond_to_request(mdr, 0); + } +}; + +void Server::handle_client_setxattr(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + string name(req->get_path2()); + MutationImpl::LockOpVec lov; + CInode *cur; + + file_layout_t *dir_layout = NULL; + if (name.compare(0, 15, "ceph.dir.layout") == 0) + cur = rdlock_path_pin_ref(mdr, 0, lov, true, false, &dir_layout); + else + cur = rdlock_path_pin_ref(mdr, 0, lov, true); + if (!cur) + return; + + if (mdr->snapid != CEPH_NOSNAP) { + respond_to_request(mdr, -EROFS); + return; + } + + int flags = req->head.args.setxattr.flags; + + // magic ceph.* namespace? + if (name.compare(0, 5, "ceph.") == 0) { + handle_set_vxattr(mdr, cur, dir_layout, lov); + return; + } + + lov.add_xlock(&cur->xattrlock); + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + if (!check_access(mdr, cur, MAY_WRITE)) + return; + + auto pxattrs = cur->get_projected_xattrs(); + size_t len = req->get_data().length(); + size_t inc = len + name.length(); + + // check xattrs kv pairs size + size_t cur_xattrs_size = 0; + for (const auto& p : *pxattrs) { + if ((flags & CEPH_XATTR_REPLACE) && (name.compare(p.first) == 0)) { + continue; + } + cur_xattrs_size += p.first.length() + p.second.length(); + } + + if (((cur_xattrs_size + inc) > g_conf()->mds_max_xattr_pairs_size)) { + dout(10) << "xattr kv pairs size too big. cur_xattrs_size " + << cur_xattrs_size << ", inc " << inc << dendl; + respond_to_request(mdr, -ENOSPC); + return; + } + + if ((flags & CEPH_XATTR_CREATE) && pxattrs->count(mempool::mds_co::string(name))) { + dout(10) << "setxattr '" << name << "' XATTR_CREATE and EEXIST on " << *cur << dendl; + respond_to_request(mdr, -EEXIST); + return; + } + if ((flags & CEPH_XATTR_REPLACE) && !pxattrs->count(mempool::mds_co::string(name))) { + dout(10) << "setxattr '" << name << "' XATTR_REPLACE and ENODATA on " << *cur << dendl; + respond_to_request(mdr, -ENODATA); + return; + } + + dout(10) << "setxattr '" << name << "' len " << len << " on " << *cur << dendl; + + // project update + auto &pi = cur->project_inode(true); + pi.inode.version = cur->pre_dirty(); + pi.inode.ctime = mdr->get_op_stamp(); + if (mdr->get_op_stamp() > pi.inode.rstat.rctime) + pi.inode.rstat.rctime = mdr->get_op_stamp(); + pi.inode.change_attr++; + pi.inode.xattr_version++; + auto &px = *pi.xattrs; + if ((flags & CEPH_XATTR_REMOVE)) { + px.erase(mempool::mds_co::string(name)); + } else { + bufferptr b = buffer::create(len); + if (len) + req->get_data().copy(0, len, b.c_str()); + auto em = px.emplace(std::piecewise_construct, std::forward_as_tuple(mempool::mds_co::string(name)), std::forward_as_tuple(b)); + if (!em.second) + em.first->second = b; + } + + // log + wait + mdr->ls = mdlog->get_current_segment(); + EUpdate *le = new EUpdate(mdlog, "setxattr"); + mdlog->start_entry(le); + le->metablob.add_client_req(req->get_reqid(), req->get_oldest_client_tid()); + mdcache->predirty_journal_parents(mdr, &le->metablob, cur, 0, PREDIRTY_PRIMARY); + mdcache->journal_dirty_inode(mdr.get(), &le->metablob, cur); + + journal_and_reply(mdr, cur, 0, le, new C_MDS_inode_update_finish(this, mdr, cur)); +} + +void Server::handle_client_removexattr(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + std::string name(req->get_path2()); + + MutationImpl::LockOpVec lov; + file_layout_t *dir_layout = nullptr; + CInode *cur; + if (name == "ceph.dir.layout") + cur = rdlock_path_pin_ref(mdr, 0, lov, true, false, &dir_layout); + else + cur = rdlock_path_pin_ref(mdr, 0, lov, true); + if (!cur) + return; + + if (mdr->snapid != CEPH_NOSNAP) { + respond_to_request(mdr, -EROFS); + return; + } + + if (name.compare(0, 5, "ceph.") == 0) { + handle_remove_vxattr(mdr, cur, dir_layout, lov); + return; + } + + lov.add_xlock(&cur->xattrlock); + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + auto pxattrs = cur->get_projected_xattrs(); + if (pxattrs->count(mempool::mds_co::string(name)) == 0) { + dout(10) << "removexattr '" << name << "' and ENODATA on " << *cur << dendl; + respond_to_request(mdr, -ENODATA); + return; + } + + dout(10) << "removexattr '" << name << "' on " << *cur << dendl; + + // project update + auto &pi = cur->project_inode(true); + auto &px = *pi.xattrs; + pi.inode.version = cur->pre_dirty(); + pi.inode.ctime = mdr->get_op_stamp(); + if (mdr->get_op_stamp() > pi.inode.rstat.rctime) + pi.inode.rstat.rctime = mdr->get_op_stamp(); + pi.inode.change_attr++; + pi.inode.xattr_version++; + px.erase(mempool::mds_co::string(name)); + + // log + wait + mdr->ls = mdlog->get_current_segment(); + EUpdate *le = new EUpdate(mdlog, "removexattr"); + mdlog->start_entry(le); + le->metablob.add_client_req(req->get_reqid(), req->get_oldest_client_tid()); + mdcache->predirty_journal_parents(mdr, &le->metablob, cur, 0, PREDIRTY_PRIMARY); + mdcache->journal_dirty_inode(mdr.get(), &le->metablob, cur); + + journal_and_reply(mdr, cur, 0, le, new C_MDS_inode_update_finish(this, mdr, cur)); +} + + +// ================================================================= +// DIRECTORY and NAMESPACE OPS + + +// ------------------------------------------------ + +// MKNOD + +class C_MDS_mknod_finish : public ServerLogContext { + CDentry *dn; + CInode *newi; +public: + C_MDS_mknod_finish(Server *s, MDRequestRef& r, CDentry *d, CInode *ni) : + ServerLogContext(s, r), dn(d), newi(ni) {} + void finish(int r) override { + ceph_assert(r == 0); + + // link the inode + dn->pop_projected_linkage(); + + // be a bit hacky with the inode version, here.. we decrement it + // just to keep mark_dirty() happen. (we didn't bother projecting + // a new version of hte inode since it's just been created) + newi->inode.version--; + newi->mark_dirty(newi->inode.version + 1, mdr->ls); + newi->mark_dirty_parent(mdr->ls, true); + + // mkdir? + if (newi->inode.is_dir()) { + CDir *dir = newi->get_dirfrag(frag_t()); + ceph_assert(dir); + dir->fnode.version--; + dir->mark_dirty(dir->fnode.version + 1, mdr->ls); + dir->mark_new(mdr->ls); + } + + mdr->apply(); + + MDRequestRef null_ref; + get_mds()->mdcache->send_dentry_link(dn, null_ref); + + if (newi->inode.is_file()) + get_mds()->locker->share_inode_max_size(newi); + + // hit pop + get_mds()->balancer->hit_inode(newi, META_POP_IWR); + + // reply + server->respond_to_request(mdr, 0); + } +}; + + +void Server::handle_client_mknod(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + client_t client = mdr->get_client(); + MutationImpl::LockOpVec lov; + file_layout_t *dir_layout = nullptr; + CDentry *dn = rdlock_path_xlock_dentry(mdr, 0, lov, false, false, false, + &dir_layout); + if (!dn) return; + if (mdr->snapid != CEPH_NOSNAP) { + respond_to_request(mdr, -EROFS); + return; + } + CInode *diri = dn->get_dir()->get_inode(); + lov.add_rdlock(&diri->authlock); + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + if (!check_access(mdr, diri, MAY_WRITE)) + return; + + if (!check_fragment_space(mdr, dn->get_dir())) + return; + + unsigned mode = req->head.args.mknod.mode; + if ((mode & S_IFMT) == 0) + mode |= S_IFREG; + + // set layout + file_layout_t layout; + if (dir_layout && S_ISREG(mode)) + layout = *dir_layout; + else + layout = mdcache->default_file_layout; + + CInode *newi = prepare_new_inode(mdr, dn->get_dir(), inodeno_t(req->head.ino), mode, &layout); + ceph_assert(newi); + + dn->push_projected_linkage(newi); + + newi->inode.rdev = req->head.args.mknod.rdev; + newi->inode.version = dn->pre_dirty(); + newi->inode.rstat.rfiles = 1; + if (layout.pool_id != mdcache->default_file_layout.pool_id) + newi->inode.add_old_pool(mdcache->default_file_layout.pool_id); + newi->inode.update_backtrace(); + + snapid_t follows = mdcache->get_global_snaprealm()->get_newest_seq(); + SnapRealm *realm = dn->get_dir()->inode->find_snaprealm(); + ceph_assert(follows >= realm->get_newest_seq()); + + // if the client created a _regular_ file via MKNOD, it's highly likely they'll + // want to write to it (e.g., if they are reexporting NFS) + if (S_ISREG(newi->inode.mode)) { + // issue a cap on the file + int cmode = CEPH_FILE_MODE_RDWR; + Capability *cap = mds->locker->issue_new_caps(newi, cmode, mdr->session, realm, req->is_replay()); + if (cap) { + cap->set_wanted(0); + + // put locks in excl mode + newi->filelock.set_state(LOCK_EXCL); + newi->authlock.set_state(LOCK_EXCL); + newi->xattrlock.set_state(LOCK_EXCL); + + dout(15) << " setting a client_range too, since this is a regular file" << dendl; + newi->inode.client_ranges[client].range.first = 0; + newi->inode.client_ranges[client].range.last = newi->inode.get_layout_size_increment(); + newi->inode.client_ranges[client].follows = follows; + cap->mark_clientwriteable(); + } + } + + ceph_assert(dn->first == follows + 1); + newi->first = dn->first; + + dout(10) << "mknod mode " << newi->inode.mode << " rdev " << newi->inode.rdev << dendl; + + // prepare finisher + mdr->ls = mdlog->get_current_segment(); + EUpdate *le = new EUpdate(mdlog, "mknod"); + mdlog->start_entry(le); + le->metablob.add_client_req(req->get_reqid(), req->get_oldest_client_tid()); + journal_allocated_inos(mdr, &le->metablob); + + mdcache->predirty_journal_parents(mdr, &le->metablob, newi, dn->get_dir(), + PREDIRTY_PRIMARY|PREDIRTY_DIR, 1); + le->metablob.add_primary_dentry(dn, newi, true, true, true); + + journal_and_reply(mdr, newi, dn, le, new C_MDS_mknod_finish(this, mdr, dn, newi)); + mds->balancer->maybe_fragment(dn->get_dir(), false); +} + + + +// MKDIR +/* This function takes responsibility for the passed mdr*/ +void Server::handle_client_mkdir(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + if (req->get_filepath().is_last_dot_or_dotdot()) { + respond_to_request(mdr, -EEXIST); + return; + } + + MutationImpl::LockOpVec lov; + CDentry *dn = rdlock_path_xlock_dentry(mdr, 0, lov, false, false, false); + if (!dn) return; + if (mdr->snapid != CEPH_NOSNAP) { + respond_to_request(mdr, -EROFS); + return; + } + CDir *dir = dn->get_dir(); + CInode *diri = dir->get_inode(); + lov.add_rdlock(&diri->authlock); + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + // mkdir check access + if (!check_access(mdr, diri, MAY_WRITE)) + return; + + if (!check_fragment_space(mdr, dir)) + return; + + // new inode + unsigned mode = req->head.args.mkdir.mode; + mode &= ~S_IFMT; + mode |= S_IFDIR; + CInode *newi = prepare_new_inode(mdr, dn->get_dir(), inodeno_t(req->head.ino), mode); + ceph_assert(newi); + + // it's a directory. + dn->push_projected_linkage(newi); + + newi->inode.version = dn->pre_dirty(); + newi->inode.rstat.rsubdirs = 1; + newi->inode.update_backtrace(); + + snapid_t follows = mdcache->get_global_snaprealm()->get_newest_seq(); + SnapRealm *realm = dn->get_dir()->inode->find_snaprealm(); + ceph_assert(follows >= realm->get_newest_seq()); + + dout(12) << " follows " << follows << dendl; + ceph_assert(dn->first == follows + 1); + newi->first = dn->first; + + // ...and that new dir is empty. + CDir *newdir = newi->get_or_open_dirfrag(mdcache, frag_t()); + newdir->state_set(CDir::STATE_CREATING); + newdir->mark_complete(); + newdir->fnode.version = newdir->pre_dirty(); + + // prepare finisher + mdr->ls = mdlog->get_current_segment(); + EUpdate *le = new EUpdate(mdlog, "mkdir"); + mdlog->start_entry(le); + le->metablob.add_client_req(req->get_reqid(), req->get_oldest_client_tid()); + journal_allocated_inos(mdr, &le->metablob); + mdcache->predirty_journal_parents(mdr, &le->metablob, newi, dn->get_dir(), PREDIRTY_PRIMARY|PREDIRTY_DIR, 1); + le->metablob.add_primary_dentry(dn, newi, true, true); + le->metablob.add_new_dir(newdir); // dirty AND complete AND new + + // issue a cap on the directory + int cmode = CEPH_FILE_MODE_RDWR; + Capability *cap = mds->locker->issue_new_caps(newi, cmode, mdr->session, realm, req->is_replay()); + if (cap) { + cap->set_wanted(0); + + // put locks in excl mode + newi->filelock.set_state(LOCK_EXCL); + newi->authlock.set_state(LOCK_EXCL); + newi->xattrlock.set_state(LOCK_EXCL); + } + + // make sure this inode gets into the journal + le->metablob.add_opened_ino(newi->ino()); + + journal_and_reply(mdr, newi, dn, le, new C_MDS_mknod_finish(this, mdr, dn, newi)); + + // We hit_dir (via hit_inode) in our finish callback, but by then we might + // have overshot the split size (multiple mkdir in flight), so here is + // an early chance to split the dir if this mkdir makes it oversized. + mds->balancer->maybe_fragment(dir, false); +} + + +// SYMLINK + +void Server::handle_client_symlink(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + MutationImpl::LockOpVec lov; + CDentry *dn = rdlock_path_xlock_dentry(mdr, 0, lov, false, false, false); + if (!dn) return; + if (mdr->snapid != CEPH_NOSNAP) { + respond_to_request(mdr, -EROFS); + return; + } + CDir *dir = dn->get_dir(); + CInode *diri = dir->get_inode(); + lov.add_rdlock(&diri->authlock); + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + if (!check_access(mdr, diri, MAY_WRITE)) + return; + + if (!check_fragment_space(mdr, dir)) + return; + + unsigned mode = S_IFLNK | 0777; + CInode *newi = prepare_new_inode(mdr, dn->get_dir(), inodeno_t(req->head.ino), mode); + ceph_assert(newi); + + // it's a symlink + dn->push_projected_linkage(newi); + + newi->symlink = req->get_path2(); + newi->inode.size = newi->symlink.length(); + newi->inode.rstat.rbytes = newi->inode.size; + newi->inode.rstat.rfiles = 1; + newi->inode.version = dn->pre_dirty(); + newi->inode.update_backtrace(); + + newi->first = dn->first; + + // prepare finisher + mdr->ls = mdlog->get_current_segment(); + EUpdate *le = new EUpdate(mdlog, "symlink"); + mdlog->start_entry(le); + le->metablob.add_client_req(req->get_reqid(), req->get_oldest_client_tid()); + journal_allocated_inos(mdr, &le->metablob); + mdcache->predirty_journal_parents(mdr, &le->metablob, newi, dn->get_dir(), PREDIRTY_PRIMARY|PREDIRTY_DIR, 1); + le->metablob.add_primary_dentry(dn, newi, true, true); + + journal_and_reply(mdr, newi, dn, le, new C_MDS_mknod_finish(this, mdr, dn, newi)); + mds->balancer->maybe_fragment(dir, false); +} + + + + + +// LINK + +void Server::handle_client_link(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + + dout(7) << "handle_client_link " << req->get_filepath() + << " to " << req->get_filepath2() + << dendl; + + MutationImpl::LockOpVec lov; + + CDentry *dn = rdlock_path_xlock_dentry(mdr, 0, lov, false, false, false); + if (!dn) return; + CInode *targeti = rdlock_path_pin_ref(mdr, 1, lov, false); + if (!targeti) return; + if (mdr->snapid != CEPH_NOSNAP) { + respond_to_request(mdr, -EROFS); + return; + } + + CDir *dir = dn->get_dir(); + dout(7) << "handle_client_link link " << dn->get_name() << " in " << *dir << dendl; + dout(7) << "target is " << *targeti << dendl; + if (targeti->is_dir()) { + // if srcdn is replica, need to make sure its linkage is correct + vector<CDentry*>& trace = mdr->dn[1]; + if (trace.empty() || + trace.back()->is_auth() || + trace.back()->lock.can_read(mdr->get_client())) { + dout(7) << "target is a dir, failing..." << dendl; + respond_to_request(mdr, -EINVAL); + return; + } + } + + lov.erase_rdlock(&targeti->snaplock); + lov.add_xlock(&targeti->snaplock); + lov.add_xlock(&targeti->linklock); + + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + if ((!mdr->has_more() || mdr->more()->witnessed.empty())) { + if (!check_access(mdr, targeti, MAY_WRITE)) + return; + + if (!check_access(mdr, dir->get_inode(), MAY_WRITE)) + return; + + if (!check_fragment_space(mdr, dir)) + return; + } + + CInode* target_pin = targeti->get_projected_parent_dir()->inode; + SnapRealm *target_realm = target_pin->find_snaprealm(); + if (target_pin != dir->inode && + target_realm->get_subvolume_ino() != + dir->inode->find_snaprealm()->get_subvolume_ino()) { + dout(7) << "target is in different subvolume, failing..." << dendl; + respond_to_request(mdr, -EXDEV); + return; + } + + // go! + ceph_assert(g_conf()->mds_kill_link_at != 1); + + // local or remote? + if (targeti->is_auth()) + _link_local(mdr, dn, targeti, target_realm); + else + _link_remote(mdr, true, dn, targeti); + mds->balancer->maybe_fragment(dir, false); +} + + +class C_MDS_link_local_finish : public ServerLogContext { + CDentry *dn; + CInode *targeti; + version_t dnpv; + version_t tipv; + bool adjust_realm; +public: + C_MDS_link_local_finish(Server *s, MDRequestRef& r, CDentry *d, CInode *ti, + version_t dnpv_, version_t tipv_, bool ar) : + ServerLogContext(s, r), dn(d), targeti(ti), + dnpv(dnpv_), tipv(tipv_), adjust_realm(ar) { } + void finish(int r) override { + ceph_assert(r == 0); + server->_link_local_finish(mdr, dn, targeti, dnpv, tipv, adjust_realm); + } +}; + + +void Server::_link_local(MDRequestRef& mdr, CDentry *dn, CInode *targeti, SnapRealm *target_realm) +{ + dout(10) << "_link_local " << *dn << " to " << *targeti << dendl; + + mdr->ls = mdlog->get_current_segment(); + + // predirty NEW dentry + version_t dnpv = dn->pre_dirty(); + version_t tipv = targeti->pre_dirty(); + + // project inode update + auto &pi = targeti->project_inode(); + pi.inode.nlink++; + pi.inode.ctime = mdr->get_op_stamp(); + if (mdr->get_op_stamp() > pi.inode.rstat.rctime) + pi.inode.rstat.rctime = mdr->get_op_stamp(); + pi.inode.change_attr++; + pi.inode.version = tipv; + + bool adjust_realm = false; + if (!target_realm->get_subvolume_ino() && !targeti->is_projected_snaprealm_global()) { + sr_t *newsnap = targeti->project_snaprealm(); + targeti->mark_snaprealm_global(newsnap); + targeti->record_snaprealm_parent_dentry(newsnap, target_realm, targeti->get_projected_parent_dn(), true); + adjust_realm = true; + } + + // log + wait + EUpdate *le = new EUpdate(mdlog, "link_local"); + mdlog->start_entry(le); + le->metablob.add_client_req(mdr->reqid, mdr->client_request->get_oldest_client_tid()); + mdcache->predirty_journal_parents(mdr, &le->metablob, targeti, dn->get_dir(), PREDIRTY_DIR, 1); // new dn + mdcache->predirty_journal_parents(mdr, &le->metablob, targeti, 0, PREDIRTY_PRIMARY); // targeti + le->metablob.add_remote_dentry(dn, true, targeti->ino(), targeti->d_type()); // new remote + mdcache->journal_dirty_inode(mdr.get(), &le->metablob, targeti); + + // do this after predirty_*, to avoid funky extra dnl arg + dn->push_projected_linkage(targeti->ino(), targeti->d_type()); + + journal_and_reply(mdr, targeti, dn, le, + new C_MDS_link_local_finish(this, mdr, dn, targeti, dnpv, tipv, adjust_realm)); +} + +void Server::_link_local_finish(MDRequestRef& mdr, CDentry *dn, CInode *targeti, + version_t dnpv, version_t tipv, bool adjust_realm) +{ + dout(10) << "_link_local_finish " << *dn << " to " << *targeti << dendl; + + // link and unlock the NEW dentry + CDentry::linkage_t *dnl = dn->pop_projected_linkage(); + if (!dnl->get_inode()) + dn->link_remote(dnl, targeti); + dn->mark_dirty(dnpv, mdr->ls); + + // target inode + targeti->pop_and_dirty_projected_inode(mdr->ls); + + mdr->apply(); + + MDRequestRef null_ref; + mdcache->send_dentry_link(dn, null_ref); + + if (adjust_realm) { + int op = CEPH_SNAP_OP_SPLIT; + mds->mdcache->send_snap_update(targeti, 0, op); + mds->mdcache->do_realm_invalidate_and_update_notify(targeti, op); + } + + // bump target popularity + mds->balancer->hit_inode(targeti, META_POP_IWR); + mds->balancer->hit_dir(dn->get_dir(), META_POP_IWR); + + // reply + respond_to_request(mdr, 0); +} + + +// link / unlink remote + +class C_MDS_link_remote_finish : public ServerLogContext { + bool inc; + CDentry *dn; + CInode *targeti; + version_t dpv; +public: + C_MDS_link_remote_finish(Server *s, MDRequestRef& r, bool i, CDentry *d, CInode *ti) : + ServerLogContext(s, r), inc(i), dn(d), targeti(ti), + dpv(d->get_projected_version()) {} + void finish(int r) override { + ceph_assert(r == 0); + server->_link_remote_finish(mdr, inc, dn, targeti, dpv); + } +}; + +void Server::_link_remote(MDRequestRef& mdr, bool inc, CDentry *dn, CInode *targeti) +{ + dout(10) << "_link_remote " + << (inc ? "link ":"unlink ") + << *dn << " to " << *targeti << dendl; + + // 1. send LinkPrepare to dest (journal nlink++ prepare) + mds_rank_t linkauth = targeti->authority().first; + if (mdr->more()->witnessed.count(linkauth) == 0) { + if (mds->is_cluster_degraded() && + !mds->mdsmap->is_clientreplay_or_active_or_stopping(linkauth)) { + dout(10) << " targeti auth mds." << linkauth << " is not active" << dendl; + if (mdr->more()->waiting_on_slave.empty()) + mds->wait_for_active_peer(linkauth, new C_MDS_RetryRequest(mdcache, mdr)); + return; + } + + dout(10) << " targeti auth must prepare nlink++/--" << dendl; + int op; + if (inc) + op = MMDSSlaveRequest::OP_LINKPREP; + else + op = MMDSSlaveRequest::OP_UNLINKPREP; + auto req = MMDSSlaveRequest::create(mdr->reqid, mdr->attempt, op); + targeti->set_object_info(req->get_object_info()); + req->op_stamp = mdr->get_op_stamp(); + if (auto& desti_srnode = mdr->more()->desti_srnode) + encode(*desti_srnode, req->desti_snapbl); + mds->send_message_mds(req, linkauth); + + ceph_assert(mdr->more()->waiting_on_slave.count(linkauth) == 0); + mdr->more()->waiting_on_slave.insert(linkauth); + return; + } + dout(10) << " targeti auth has prepared nlink++/--" << dendl; + + ceph_assert(g_conf()->mds_kill_link_at != 2); + + if (auto& desti_srnode = mdr->more()->desti_srnode) { + delete desti_srnode; + desti_srnode = NULL; + } + + mdr->set_mds_stamp(ceph_clock_now()); + + // add to event + mdr->ls = mdlog->get_current_segment(); + EUpdate *le = new EUpdate(mdlog, inc ? "link_remote":"unlink_remote"); + mdlog->start_entry(le); + le->metablob.add_client_req(mdr->reqid, mdr->client_request->get_oldest_client_tid()); + if (!mdr->more()->witnessed.empty()) { + dout(20) << " noting uncommitted_slaves " << mdr->more()->witnessed << dendl; + le->reqid = mdr->reqid; + le->had_slaves = true; + mdcache->add_uncommitted_master(mdr->reqid, mdr->ls, mdr->more()->witnessed); + } + + if (inc) { + dn->pre_dirty(); + mdcache->predirty_journal_parents(mdr, &le->metablob, targeti, dn->get_dir(), PREDIRTY_DIR, 1); + le->metablob.add_remote_dentry(dn, true, targeti->ino(), targeti->d_type()); // new remote + dn->push_projected_linkage(targeti->ino(), targeti->d_type()); + } else { + dn->pre_dirty(); + mdcache->predirty_journal_parents(mdr, &le->metablob, targeti, dn->get_dir(), PREDIRTY_DIR, -1); + mdcache->journal_cow_dentry(mdr.get(), &le->metablob, dn); + le->metablob.add_null_dentry(dn, true); + dn->push_projected_linkage(); + } + + journal_and_reply(mdr, targeti, dn, le, new C_MDS_link_remote_finish(this, mdr, inc, dn, targeti)); +} + +void Server::_link_remote_finish(MDRequestRef& mdr, bool inc, + CDentry *dn, CInode *targeti, + version_t dpv) +{ + dout(10) << "_link_remote_finish " + << (inc ? "link ":"unlink ") + << *dn << " to " << *targeti << dendl; + + ceph_assert(g_conf()->mds_kill_link_at != 3); + + if (!mdr->more()->witnessed.empty()) + mdcache->logged_master_update(mdr->reqid); + + if (inc) { + // link the new dentry + CDentry::linkage_t *dnl = dn->pop_projected_linkage(); + if (!dnl->get_inode()) + dn->link_remote(dnl, targeti); + dn->mark_dirty(dpv, mdr->ls); + } else { + // unlink main dentry + dn->get_dir()->unlink_inode(dn); + dn->pop_projected_linkage(); + dn->mark_dirty(dn->get_projected_version(), mdr->ls); // dirty old dentry + } + + mdr->apply(); + + MDRequestRef null_ref; + if (inc) + mdcache->send_dentry_link(dn, null_ref); + else + mdcache->send_dentry_unlink(dn, NULL, null_ref); + + // bump target popularity + mds->balancer->hit_inode(targeti, META_POP_IWR); + mds->balancer->hit_dir(dn->get_dir(), META_POP_IWR); + + // reply + respond_to_request(mdr, 0); + + if (!inc) + // removing a new dn? + dn->get_dir()->try_remove_unlinked_dn(dn); +} + + +// remote linking/unlinking + +class C_MDS_SlaveLinkPrep : public ServerLogContext { + CInode *targeti; + bool adjust_realm; +public: + C_MDS_SlaveLinkPrep(Server *s, MDRequestRef& r, CInode *t, bool ar) : + ServerLogContext(s, r), targeti(t), adjust_realm(ar) { } + void finish(int r) override { + ceph_assert(r == 0); + server->_logged_slave_link(mdr, targeti, adjust_realm); + } +}; + +class C_MDS_SlaveLinkCommit : public ServerContext { + MDRequestRef mdr; + CInode *targeti; +public: + C_MDS_SlaveLinkCommit(Server *s, MDRequestRef& r, CInode *t) : + ServerContext(s), mdr(r), targeti(t) { } + void finish(int r) override { + server->_commit_slave_link(mdr, r, targeti); + } +}; + +void Server::handle_slave_link_prep(MDRequestRef& mdr) +{ + dout(10) << "handle_slave_link_prep " << *mdr + << " on " << mdr->slave_request->get_object_info() + << dendl; + + ceph_assert(g_conf()->mds_kill_link_at != 4); + + CInode *targeti = mdcache->get_inode(mdr->slave_request->get_object_info().ino); + ceph_assert(targeti); + dout(10) << "targeti " << *targeti << dendl; + CDentry *dn = targeti->get_parent_dn(); + CDentry::linkage_t *dnl = dn->get_linkage(); + ceph_assert(dnl->is_primary()); + + mdr->set_op_stamp(mdr->slave_request->op_stamp); + + mdr->auth_pin(targeti); + + //ceph_abort(); // test hack: make sure master can handle a slave that fails to prepare... + ceph_assert(g_conf()->mds_kill_link_at != 5); + + // journal it + mdr->ls = mdlog->get_current_segment(); + ESlaveUpdate *le = new ESlaveUpdate(mdlog, "slave_link_prep", mdr->reqid, mdr->slave_to_mds, + ESlaveUpdate::OP_PREPARE, ESlaveUpdate::LINK); + mdlog->start_entry(le); + + auto &pi = dnl->get_inode()->project_inode(); + + // update journaled target inode + bool inc; + bool adjust_realm = false; + bool realm_projected = false; + if (mdr->slave_request->get_op() == MMDSSlaveRequest::OP_LINKPREP) { + inc = true; + pi.inode.nlink++; + + CDentry *target_pdn = targeti->get_projected_parent_dn(); + SnapRealm *target_realm = target_pdn->get_dir()->inode->find_snaprealm(); + if (!target_realm->get_subvolume_ino() && !targeti->is_projected_snaprealm_global()) { + sr_t *newsnap = targeti->project_snaprealm(); + targeti->mark_snaprealm_global(newsnap); + targeti->record_snaprealm_parent_dentry(newsnap, target_realm, target_pdn, true); + adjust_realm = true; + realm_projected = true; + } + } else { + inc = false; + pi.inode.nlink--; + if (targeti->is_projected_snaprealm_global()) { + ceph_assert(mdr->slave_request->desti_snapbl.length()); + auto p = mdr->slave_request->desti_snapbl.cbegin(); + + sr_t *newsnap = targeti->project_snaprealm(); + decode(*newsnap, p); + + if (pi.inode.nlink == 0) + ceph_assert(!newsnap->is_parent_global()); + + realm_projected = true; + } else { + ceph_assert(mdr->slave_request->desti_snapbl.length() == 0); + } + } + + link_rollback rollback; + rollback.reqid = mdr->reqid; + rollback.ino = targeti->ino(); + rollback.old_ctime = targeti->inode.ctime; // we hold versionlock xlock; no concorrent projections + const fnode_t *pf = targeti->get_parent_dn()->get_dir()->get_projected_fnode(); + rollback.old_dir_mtime = pf->fragstat.mtime; + rollback.old_dir_rctime = pf->rstat.rctime; + rollback.was_inc = inc; + if (realm_projected) { + if (targeti->snaprealm) { + encode(true, rollback.snapbl); + targeti->encode_snap_blob(rollback.snapbl); + } else { + encode(false, rollback.snapbl); + } + } + encode(rollback, le->rollback); + mdr->more()->rollback_bl = le->rollback; + + pi.inode.ctime = mdr->get_op_stamp(); + pi.inode.version = targeti->pre_dirty(); + + dout(10) << " projected inode " << pi.inode.ino << " v " << pi.inode.version << dendl; + + // commit case + mdcache->predirty_journal_parents(mdr, &le->commit, dnl->get_inode(), 0, PREDIRTY_SHALLOW|PREDIRTY_PRIMARY); + mdcache->journal_dirty_inode(mdr.get(), &le->commit, targeti); + mdcache->add_uncommitted_slave(mdr->reqid, mdr->ls, mdr->slave_to_mds); + + // set up commit waiter + mdr->more()->slave_commit = new C_MDS_SlaveLinkCommit(this, mdr, targeti); + + mdr->more()->slave_update_journaled = true; + submit_mdlog_entry(le, new C_MDS_SlaveLinkPrep(this, mdr, targeti, adjust_realm), + mdr, __func__); + mdlog->flush(); +} + +void Server::_logged_slave_link(MDRequestRef& mdr, CInode *targeti, bool adjust_realm) +{ + dout(10) << "_logged_slave_link " << *mdr + << " " << *targeti << dendl; + + ceph_assert(g_conf()->mds_kill_link_at != 6); + + // update the target + targeti->pop_and_dirty_projected_inode(mdr->ls); + mdr->apply(); + + // hit pop + mds->balancer->hit_inode(targeti, META_POP_IWR); + + // done. + mdr->reset_slave_request(); + + if (adjust_realm) { + int op = CEPH_SNAP_OP_SPLIT; + mds->mdcache->send_snap_update(targeti, 0, op); + mds->mdcache->do_realm_invalidate_and_update_notify(targeti, op); + } + + // ack + if (!mdr->aborted) { + auto reply = MMDSSlaveRequest::create(mdr->reqid, mdr->attempt, MMDSSlaveRequest::OP_LINKPREPACK); + mds->send_message_mds(reply, mdr->slave_to_mds); + } else { + dout(10) << " abort flag set, finishing" << dendl; + mdcache->request_finish(mdr); + } +} + + +struct C_MDS_CommittedSlave : public ServerLogContext { + C_MDS_CommittedSlave(Server *s, MDRequestRef& m) : ServerLogContext(s, m) {} + void finish(int r) override { + server->_committed_slave(mdr); + } +}; + +void Server::_commit_slave_link(MDRequestRef& mdr, int r, CInode *targeti) +{ + dout(10) << "_commit_slave_link " << *mdr + << " r=" << r + << " " << *targeti << dendl; + + ceph_assert(g_conf()->mds_kill_link_at != 7); + + if (r == 0) { + // drop our pins, etc. + mdr->cleanup(); + + // write a commit to the journal + ESlaveUpdate *le = new ESlaveUpdate(mdlog, "slave_link_commit", mdr->reqid, mdr->slave_to_mds, + ESlaveUpdate::OP_COMMIT, ESlaveUpdate::LINK); + mdlog->start_entry(le); + submit_mdlog_entry(le, new C_MDS_CommittedSlave(this, mdr), mdr, __func__); + mdlog->flush(); + } else { + do_link_rollback(mdr->more()->rollback_bl, mdr->slave_to_mds, mdr); + } +} + +void Server::_committed_slave(MDRequestRef& mdr) +{ + dout(10) << "_committed_slave " << *mdr << dendl; + + ceph_assert(g_conf()->mds_kill_link_at != 8); + + bool assert_exist = mdr->more()->slave_update_journaled; + mdcache->finish_uncommitted_slave(mdr->reqid, assert_exist); + auto req = MMDSSlaveRequest::create(mdr->reqid, mdr->attempt, MMDSSlaveRequest::OP_COMMITTED); + mds->send_message_mds(req, mdr->slave_to_mds); + mdcache->request_finish(mdr); +} + +struct C_MDS_LoggedLinkRollback : public ServerLogContext { + MutationRef mut; + map<client_t,MClientSnap::ref> splits; + C_MDS_LoggedLinkRollback(Server *s, MutationRef& m, MDRequestRef& r, + map<client_t,MClientSnap::ref>&& _splits) : + ServerLogContext(s, r), mut(m), splits(std::move(_splits)) { + } + void finish(int r) override { + server->_link_rollback_finish(mut, mdr, splits); + } +}; + +void Server::do_link_rollback(bufferlist &rbl, mds_rank_t master, MDRequestRef& mdr) +{ + link_rollback rollback; + auto p = rbl.cbegin(); + decode(rollback, p); + + dout(10) << "do_link_rollback on " << rollback.reqid + << (rollback.was_inc ? " inc":" dec") + << " ino " << rollback.ino + << dendl; + + ceph_assert(g_conf()->mds_kill_link_at != 9); + + mdcache->add_rollback(rollback.reqid, master); // need to finish this update before resolve finishes + ceph_assert(mdr || mds->is_resolve()); + + MutationRef mut(new MutationImpl(nullptr, utime_t(), rollback.reqid)); + mut->ls = mds->mdlog->get_current_segment(); + + CInode *in = mdcache->get_inode(rollback.ino); + ceph_assert(in); + dout(10) << " target is " << *in << dendl; + ceph_assert(!in->is_projected()); // live slave request hold versionlock xlock. + + auto &pi = in->project_inode(); + pi.inode.version = in->pre_dirty(); + mut->add_projected_inode(in); + + // parent dir rctime + CDir *parent = in->get_projected_parent_dn()->get_dir(); + fnode_t *pf = parent->project_fnode(); + mut->add_projected_fnode(parent); + pf->version = parent->pre_dirty(); + if (pf->fragstat.mtime == pi.inode.ctime) { + pf->fragstat.mtime = rollback.old_dir_mtime; + if (pf->rstat.rctime == pi.inode.ctime) + pf->rstat.rctime = rollback.old_dir_rctime; + mut->add_updated_lock(&parent->get_inode()->filelock); + mut->add_updated_lock(&parent->get_inode()->nestlock); + } + + // inode + pi.inode.ctime = rollback.old_ctime; + if (rollback.was_inc) + pi.inode.nlink--; + else + pi.inode.nlink++; + + map<client_t,MClientSnap::ref> splits; + if (rollback.snapbl.length() && in->snaprealm) { + bool hadrealm; + auto p = rollback.snapbl.cbegin(); + decode(hadrealm, p); + if (hadrealm) { + if (!mds->is_resolve()) { + sr_t *new_srnode = new sr_t(); + decode(*new_srnode, p); + in->project_snaprealm(new_srnode); + } else { + decode(in->snaprealm->srnode, p); + } + } else { + SnapRealm *realm = parent->get_inode()->find_snaprealm(); + if (!mds->is_resolve()) + mdcache->prepare_realm_merge(in->snaprealm, realm, splits); + in->project_snaprealm(NULL); + } + } + + // journal it + ESlaveUpdate *le = new ESlaveUpdate(mdlog, "slave_link_rollback", rollback.reqid, master, + ESlaveUpdate::OP_ROLLBACK, ESlaveUpdate::LINK); + mdlog->start_entry(le); + le->commit.add_dir_context(parent); + le->commit.add_dir(parent, true); + le->commit.add_primary_dentry(in->get_projected_parent_dn(), 0, true); + + submit_mdlog_entry(le, new C_MDS_LoggedLinkRollback(this, mut, mdr, std::move(splits)), + mdr, __func__); + mdlog->flush(); +} + +void Server::_link_rollback_finish(MutationRef& mut, MDRequestRef& mdr, + map<client_t,MClientSnap::ref>& splits) +{ + dout(10) << "_link_rollback_finish" << dendl; + + ceph_assert(g_conf()->mds_kill_link_at != 10); + + mut->apply(); + + if (!mds->is_resolve()) + mdcache->send_snaps(splits); + + if (mdr) + mdcache->request_finish(mdr); + + mdcache->finish_rollback(mut->reqid, mdr); + + mut->cleanup(); +} + + +void Server::handle_slave_link_prep_ack(MDRequestRef& mdr, const MMDSSlaveRequest::const_ref &m) +{ + dout(10) << "handle_slave_link_prep_ack " << *mdr + << " " << *m << dendl; + mds_rank_t from = mds_rank_t(m->get_source().num()); + + ceph_assert(g_conf()->mds_kill_link_at != 11); + + // note slave + mdr->more()->slaves.insert(from); + + // witnessed! + ceph_assert(mdr->more()->witnessed.count(from) == 0); + mdr->more()->witnessed.insert(from); + ceph_assert(!m->is_not_journaled()); + mdr->more()->has_journaled_slaves = true; + + // remove from waiting list + ceph_assert(mdr->more()->waiting_on_slave.count(from)); + mdr->more()->waiting_on_slave.erase(from); + + ceph_assert(mdr->more()->waiting_on_slave.empty()); + + dispatch_client_request(mdr); // go again! +} + + + + + +// UNLINK + +void Server::handle_client_unlink(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + client_t client = mdr->get_client(); + + // rmdir or unlink? + bool rmdir = false; + if (req->get_op() == CEPH_MDS_OP_RMDIR) rmdir = true; + + const filepath& refpath = req->get_filepath(); + if (refpath.depth() == 0) { + respond_to_request(mdr, -EINVAL); + return; + } + if (refpath.is_last_dot_or_dotdot()) { + respond_to_request(mdr, -ENOTEMPTY); + return; + } + + // traverse to path + vector<CDentry*> trace; + CInode *in; + CF_MDS_MDRContextFactory cf(mdcache, mdr); + int r = mdcache->path_traverse(mdr, cf, refpath, &trace, &in, MDS_TRAVERSE_FORWARD); + if (r > 0) return; + if (r < 0) { + if (r == -ESTALE) { + dout(10) << "FAIL on ESTALE but attempting recovery" << dendl; + mdcache->find_ino_peers(refpath.get_ino(), new C_MDS_TryFindInode(this, mdr)); + return; + } + respond_to_request(mdr, r); + return; + } + if (mdr->snapid != CEPH_NOSNAP) { + respond_to_request(mdr, -EROFS); + return; + } + + CDentry *dn = trace.back(); + ceph_assert(dn); + if (!dn->is_auth()) { + mdcache->request_forward(mdr, dn->authority().first); + return; + } + + CInode *diri = dn->get_dir()->get_inode(); + + CDentry::linkage_t *dnl = dn->get_linkage(client, mdr); + ceph_assert(!dnl->is_null()); + + if (rmdir) { + dout(7) << "handle_client_rmdir on " << *dn << dendl; + } else { + dout(7) << "handle_client_unlink on " << *dn << dendl; + } + dout(7) << "dn links to " << *in << dendl; + + // rmdir vs is_dir + if (in->is_dir()) { + if (rmdir) { + // do empty directory checks + if (_dir_is_nonempty_unlocked(mdr, in)) { + respond_to_request(mdr, -ENOTEMPTY); + return; + } + } else { + dout(7) << "handle_client_unlink on dir " << *in << ", returning error" << dendl; + respond_to_request(mdr, -EISDIR); + return; + } + } else { + if (rmdir) { + // unlink + dout(7) << "handle_client_rmdir on non-dir " << *in << ", returning error" << dendl; + respond_to_request(mdr, -ENOTDIR); + return; + } + } + + // -- create stray dentry? -- + CDentry *straydn = NULL; + if (dnl->is_primary()) { + straydn = prepare_stray_dentry(mdr, dnl->get_inode()); + if (!straydn) + return; + dout(10) << " straydn is " << *straydn << dendl; + } else if (mdr->straydn) { + mdr->unpin(mdr->straydn); + mdr->straydn = NULL; + } + + // lock + MutationImpl::LockOpVec lov; + + for (int i=0; i<(int)trace.size()-1; i++) + lov.add_rdlock(&trace[i]->lock); + lov.add_xlock(&dn->lock); + lov.add_wrlock(&diri->filelock); + lov.add_wrlock(&diri->nestlock); + lov.add_xlock(&in->linklock); + if (straydn) { + lov.add_wrlock(&straydn->get_dir()->inode->filelock); + lov.add_wrlock(&straydn->get_dir()->inode->nestlock); + lov.add_xlock(&straydn->lock); + } + + mds->locker->include_snap_rdlocks(diri, lov); + lov.add_xlock(&in->snaplock); + if (in->is_dir()) + lov.add_rdlock(&in->filelock); // to verify it's empty + + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + if (in->is_dir() && + _dir_is_nonempty(mdr, in)) { + respond_to_request(mdr, -ENOTEMPTY); + return; + } + + if ((!mdr->has_more() || mdr->more()->witnessed.empty())) { + if (!check_access(mdr, diri, MAY_WRITE)) + return; + } + + if (straydn) + straydn->first = mdcache->get_global_snaprealm()->get_newest_seq() + 1; + + if (!mdr->more()->desti_srnode) { + if (in->is_projected_snaprealm_global()) { + sr_t *new_srnode = in->prepare_new_srnode(0); + in->record_snaprealm_parent_dentry(new_srnode, nullptr, dn, dnl->is_primary()); + // dropping the last linkage or dropping the last remote linkage, + // detch the inode from global snaprealm + auto nlink = in->get_projected_inode()->nlink; + if (nlink == 1 || + (nlink == 2 && !dnl->is_primary() && + !in->get_projected_parent_dir()->inode->is_stray())) + in->clear_snaprealm_global(new_srnode); + mdr->more()->desti_srnode = new_srnode; + } else if (dnl->is_primary()) { + // prepare snaprealm blob for slave request + SnapRealm *realm = in->find_snaprealm(); + snapid_t follows = realm->get_newest_seq(); + if (in->snaprealm || follows + 1 > in->get_oldest_snap()) { + sr_t *new_srnode = in->prepare_new_srnode(follows); + in->record_snaprealm_past_parent(new_srnode, straydn->get_dir()->inode->find_snaprealm()); + mdr->more()->desti_srnode = new_srnode; + } + } + } + + // yay! + if (in->is_dir() && in->has_subtree_root_dirfrag()) { + // subtree root auths need to be witnesses + set<mds_rank_t> witnesses; + in->list_replicas(witnesses); + dout(10) << " witnesses " << witnesses << ", have " << mdr->more()->witnessed << dendl; + + for (set<mds_rank_t>::iterator p = witnesses.begin(); + p != witnesses.end(); + ++p) { + if (mdr->more()->witnessed.count(*p)) { + dout(10) << " already witnessed by mds." << *p << dendl; + } else if (mdr->more()->waiting_on_slave.count(*p)) { + dout(10) << " already waiting on witness mds." << *p << dendl; + } else { + if (!_rmdir_prepare_witness(mdr, *p, trace, straydn)) + return; + } + } + if (!mdr->more()->waiting_on_slave.empty()) + return; // we're waiting for a witness. + } + + // ok! + if (dnl->is_remote() && !dnl->get_inode()->is_auth()) + _link_remote(mdr, false, dn, dnl->get_inode()); + else + _unlink_local(mdr, dn, straydn); +} + +class C_MDS_unlink_local_finish : public ServerLogContext { + CDentry *dn; + CDentry *straydn; + version_t dnpv; // deleted dentry +public: + C_MDS_unlink_local_finish(Server *s, MDRequestRef& r, CDentry *d, CDentry *sd) : + ServerLogContext(s, r), dn(d), straydn(sd), + dnpv(d->get_projected_version()) {} + void finish(int r) override { + ceph_assert(r == 0); + server->_unlink_local_finish(mdr, dn, straydn, dnpv); + } +}; + +void Server::_unlink_local(MDRequestRef& mdr, CDentry *dn, CDentry *straydn) +{ + dout(10) << "_unlink_local " << *dn << dendl; + + CDentry::linkage_t *dnl = dn->get_projected_linkage(); + CInode *in = dnl->get_inode(); + + + // ok, let's do it. + mdr->ls = mdlog->get_current_segment(); + + // prepare log entry + EUpdate *le = new EUpdate(mdlog, "unlink_local"); + mdlog->start_entry(le); + le->metablob.add_client_req(mdr->reqid, mdr->client_request->get_oldest_client_tid()); + if (!mdr->more()->witnessed.empty()) { + dout(20) << " noting uncommitted_slaves " << mdr->more()->witnessed << dendl; + le->reqid = mdr->reqid; + le->had_slaves = true; + mdcache->add_uncommitted_master(mdr->reqid, mdr->ls, mdr->more()->witnessed); + } + + if (straydn) { + ceph_assert(dnl->is_primary()); + straydn->push_projected_linkage(in); + } + + // the unlinked dentry + dn->pre_dirty(); + + auto &pi = in->project_inode(); + { + std::string t; + dn->make_path_string(t, true); + pi.inode.stray_prior_path = std::move(t); + } + pi.inode.version = in->pre_dirty(); + pi.inode.ctime = mdr->get_op_stamp(); + if (mdr->get_op_stamp() > pi.inode.rstat.rctime) + pi.inode.rstat.rctime = mdr->get_op_stamp(); + pi.inode.change_attr++; + pi.inode.nlink--; + if (pi.inode.nlink == 0) + in->state_set(CInode::STATE_ORPHAN); + + if (mdr->more()->desti_srnode) { + auto& desti_srnode = mdr->more()->desti_srnode; + in->project_snaprealm(desti_srnode); + desti_srnode = NULL; + } + + if (straydn) { + // will manually pop projected inode + + // primary link. add stray dentry. + mdcache->predirty_journal_parents(mdr, &le->metablob, in, dn->get_dir(), PREDIRTY_PRIMARY|PREDIRTY_DIR, -1); + mdcache->predirty_journal_parents(mdr, &le->metablob, in, straydn->get_dir(), PREDIRTY_PRIMARY|PREDIRTY_DIR, 1); + + pi.inode.update_backtrace(); + le->metablob.add_primary_dentry(straydn, in, true, true); + } else { + mdr->add_projected_inode(in); + // remote link. update remote inode. + mdcache->predirty_journal_parents(mdr, &le->metablob, in, dn->get_dir(), PREDIRTY_DIR, -1); + mdcache->predirty_journal_parents(mdr, &le->metablob, in, 0, PREDIRTY_PRIMARY); + mdcache->journal_dirty_inode(mdr.get(), &le->metablob, in); + } + + mdcache->journal_cow_dentry(mdr.get(), &le->metablob, dn); + le->metablob.add_null_dentry(dn, true); + + if (in->is_dir()) { + dout(10) << " noting renamed (unlinked) dir ino " << in->ino() << " in metablob" << dendl; + le->metablob.renamed_dirino = in->ino(); + } + + dn->push_projected_linkage(); + + if (straydn) { + ceph_assert(in->first <= straydn->first); + in->first = straydn->first; + } + + if (in->is_dir()) { + ceph_assert(straydn); + mdcache->project_subtree_rename(in, dn->get_dir(), straydn->get_dir()); + } + + journal_and_reply(mdr, 0, dn, le, new C_MDS_unlink_local_finish(this, mdr, dn, straydn)); +} + +void Server::_unlink_local_finish(MDRequestRef& mdr, + CDentry *dn, CDentry *straydn, + version_t dnpv) +{ + dout(10) << "_unlink_local_finish " << *dn << dendl; + + if (!mdr->more()->witnessed.empty()) + mdcache->logged_master_update(mdr->reqid); + + CInode *strayin = NULL; + bool hadrealm = false; + if (straydn) { + // if there is newly created snaprealm, need to split old snaprealm's + // inodes_with_caps. So pop snaprealm before linkage changes. + strayin = dn->get_linkage()->get_inode(); + hadrealm = strayin->snaprealm ? true : false; + strayin->early_pop_projected_snaprealm(); + } + + // unlink main dentry + dn->get_dir()->unlink_inode(dn); + dn->pop_projected_linkage(); + + // relink as stray? (i.e. was primary link?) + if (straydn) { + dout(20) << " straydn is " << *straydn << dendl; + straydn->pop_projected_linkage(); + + strayin->pop_and_dirty_projected_inode(mdr->ls); + + mdcache->touch_dentry_bottom(straydn); + } + + dn->mark_dirty(dnpv, mdr->ls); + mdr->apply(); + + mdcache->send_dentry_unlink(dn, straydn, mdr); + + if (straydn) { + // update subtree map? + if (strayin->is_dir()) + mdcache->adjust_subtree_after_rename(strayin, dn->get_dir(), true); + + if (strayin->snaprealm && !hadrealm) + mdcache->do_realm_invalidate_and_update_notify(strayin, CEPH_SNAP_OP_SPLIT, false); + } + + // bump pop + mds->balancer->hit_dir(dn->get_dir(), META_POP_IWR); + + // reply + respond_to_request(mdr, 0); + + // removing a new dn? + dn->get_dir()->try_remove_unlinked_dn(dn); + + // clean up ? + // respond_to_request() drops locks. So stray reintegration can race with us. + if (straydn && !straydn->get_projected_linkage()->is_null()) { + // Tip off the MDCache that this dentry is a stray that + // might be elegible for purge. + mdcache->notify_stray(straydn); + } +} + +bool Server::_rmdir_prepare_witness(MDRequestRef& mdr, mds_rank_t who, vector<CDentry*>& trace, CDentry *straydn) +{ + if (mds->is_cluster_degraded() && + !mds->mdsmap->is_clientreplay_or_active_or_stopping(who)) { + dout(10) << "_rmdir_prepare_witness mds." << who << " is not active" << dendl; + if (mdr->more()->waiting_on_slave.empty()) + mds->wait_for_active_peer(who, new C_MDS_RetryRequest(mdcache, mdr)); + return false; + } + + dout(10) << "_rmdir_prepare_witness mds." << who << dendl; + auto req = MMDSSlaveRequest::create(mdr->reqid, mdr->attempt, MMDSSlaveRequest::OP_RMDIRPREP); + req->srcdnpath = filepath(trace.front()->get_dir()->ino()); + for (auto dn : trace) + req->srcdnpath.push_dentry(dn->get_name()); + mdcache->replicate_stray(straydn, who, req->straybl); + if (mdr->more()->desti_srnode) + encode(*mdr->more()->desti_srnode, req->desti_snapbl); + + req->op_stamp = mdr->get_op_stamp(); + mds->send_message_mds(req, who); + + ceph_assert(mdr->more()->waiting_on_slave.count(who) == 0); + mdr->more()->waiting_on_slave.insert(who); + return true; +} + +struct C_MDS_SlaveRmdirPrep : public ServerLogContext { + CDentry *dn, *straydn; + C_MDS_SlaveRmdirPrep(Server *s, MDRequestRef& r, CDentry *d, CDentry *st) + : ServerLogContext(s, r), dn(d), straydn(st) {} + void finish(int r) override { + server->_logged_slave_rmdir(mdr, dn, straydn); + } +}; + +struct C_MDS_SlaveRmdirCommit : public ServerContext { + MDRequestRef mdr; + CDentry *straydn; + C_MDS_SlaveRmdirCommit(Server *s, MDRequestRef& r, CDentry *sd) + : ServerContext(s), mdr(r), straydn(sd) { } + void finish(int r) override { + server->_commit_slave_rmdir(mdr, r, straydn); + } +}; + +void Server::handle_slave_rmdir_prep(MDRequestRef& mdr) +{ + dout(10) << "handle_slave_rmdir_prep " << *mdr + << " " << mdr->slave_request->srcdnpath + << " to " << mdr->slave_request->destdnpath + << dendl; + + vector<CDentry*> trace; + filepath srcpath(mdr->slave_request->srcdnpath); + dout(10) << " src " << srcpath << dendl; + CInode *in; + CF_MDS_MDRContextFactory cf(mdcache, mdr); + int r = mdcache->path_traverse(mdr, cf, srcpath, &trace, &in, MDS_TRAVERSE_DISCOVERXLOCK); + if (r > 0) return; + if (r == -ESTALE) { + mdcache->find_ino_peers(srcpath.get_ino(), new C_MDS_RetryRequest(mdcache, mdr), + mdr->slave_to_mds); + return; + } + ceph_assert(r == 0); + CDentry *dn = trace.back(); + dout(10) << " dn " << *dn << dendl; + mdr->pin(dn); + + ceph_assert(mdr->straydn); + CDentry *straydn = mdr->straydn; + dout(10) << " straydn " << *straydn << dendl; + + mdr->set_op_stamp(mdr->slave_request->op_stamp); + + rmdir_rollback rollback; + rollback.reqid = mdr->reqid; + rollback.src_dir = dn->get_dir()->dirfrag(); + rollback.src_dname = dn->get_name(); + rollback.dest_dir = straydn->get_dir()->dirfrag(); + rollback.dest_dname = straydn->get_name(); + if (mdr->slave_request->desti_snapbl.length()) { + if (in->snaprealm) { + encode(true, rollback.snapbl); + in->encode_snap_blob(rollback.snapbl); + } else { + encode(false, rollback.snapbl); + } + } + encode(rollback, mdr->more()->rollback_bl); + // FIXME: rollback snaprealm + dout(20) << " rollback is " << mdr->more()->rollback_bl.length() << " bytes" << dendl; + + // set up commit waiter + mdr->more()->slave_commit = new C_MDS_SlaveRmdirCommit(this, mdr, straydn); + + straydn->push_projected_linkage(in); + dn->push_projected_linkage(); + + ceph_assert(straydn->first >= in->first); + in->first = straydn->first; + + if (!in->has_subtree_root_dirfrag(mds->get_nodeid())) { + dout(10) << " no auth subtree in " << *in << ", skipping journal" << dendl; + _logged_slave_rmdir(mdr, dn, straydn); + return; + } + + mdr->ls = mdlog->get_current_segment(); + ESlaveUpdate *le = new ESlaveUpdate(mdlog, "slave_rmdir", mdr->reqid, mdr->slave_to_mds, + ESlaveUpdate::OP_PREPARE, ESlaveUpdate::RMDIR); + mdlog->start_entry(le); + le->rollback = mdr->more()->rollback_bl; + + le->commit.add_dir_context(straydn->get_dir()); + le->commit.add_primary_dentry(straydn, in, true); + // slave: no need to journal original dentry + + dout(10) << " noting renamed (unlinked) dir ino " << in->ino() << " in metablob" << dendl; + le->commit.renamed_dirino = in->ino(); + + mdcache->project_subtree_rename(in, dn->get_dir(), straydn->get_dir()); + mdcache->add_uncommitted_slave(mdr->reqid, mdr->ls, mdr->slave_to_mds); + + mdr->more()->slave_update_journaled = true; + submit_mdlog_entry(le, new C_MDS_SlaveRmdirPrep(this, mdr, dn, straydn), + mdr, __func__); + mdlog->flush(); +} + +void Server::_logged_slave_rmdir(MDRequestRef& mdr, CDentry *dn, CDentry *straydn) +{ + dout(10) << "_logged_slave_rmdir " << *mdr << " on " << *dn << dendl; + CInode *in = dn->get_linkage()->get_inode(); + + bool new_realm; + if (mdr->slave_request->desti_snapbl.length()) { + new_realm = !in->snaprealm; + in->decode_snap_blob(mdr->slave_request->desti_snapbl); + ceph_assert(in->snaprealm); + ceph_assert(in->snaprealm->have_past_parents_open()); + } else { + new_realm = false; + } + + // update our cache now, so we are consistent with what is in the journal + // when we journal a subtree map + dn->get_dir()->unlink_inode(dn); + straydn->pop_projected_linkage(); + dn->pop_projected_linkage(); + + mdcache->adjust_subtree_after_rename(in, dn->get_dir(), mdr->more()->slave_update_journaled); + + if (new_realm) + mdcache->do_realm_invalidate_and_update_notify(in, CEPH_SNAP_OP_SPLIT, false); + + // done. + mdr->reset_slave_request(); + mdr->straydn = 0; + + if (!mdr->aborted) { + auto reply = MMDSSlaveRequest::create(mdr->reqid, mdr->attempt, MMDSSlaveRequest::OP_RMDIRPREPACK); + if (!mdr->more()->slave_update_journaled) + reply->mark_not_journaled(); + mds->send_message_mds(reply, mdr->slave_to_mds); + } else { + dout(10) << " abort flag set, finishing" << dendl; + mdcache->request_finish(mdr); + } +} + +void Server::handle_slave_rmdir_prep_ack(MDRequestRef& mdr, const MMDSSlaveRequest::const_ref &ack) +{ + dout(10) << "handle_slave_rmdir_prep_ack " << *mdr + << " " << *ack << dendl; + + mds_rank_t from = mds_rank_t(ack->get_source().num()); + + mdr->more()->slaves.insert(from); + mdr->more()->witnessed.insert(from); + if (!ack->is_not_journaled()) + mdr->more()->has_journaled_slaves = true; + + // remove from waiting list + ceph_assert(mdr->more()->waiting_on_slave.count(from)); + mdr->more()->waiting_on_slave.erase(from); + + if (mdr->more()->waiting_on_slave.empty()) + dispatch_client_request(mdr); // go again! + else + dout(10) << "still waiting on slaves " << mdr->more()->waiting_on_slave << dendl; +} + +void Server::_commit_slave_rmdir(MDRequestRef& mdr, int r, CDentry *straydn) +{ + dout(10) << "_commit_slave_rmdir " << *mdr << " r=" << r << dendl; + + if (r == 0) { + if (mdr->more()->slave_update_journaled) { + CInode *strayin = straydn->get_projected_linkage()->get_inode(); + if (strayin && !strayin->snaprealm) + mdcache->clear_dirty_bits_for_stray(strayin); + } + + mdr->cleanup(); + + if (mdr->more()->slave_update_journaled) { + // write a commit to the journal + ESlaveUpdate *le = new ESlaveUpdate(mdlog, "slave_rmdir_commit", mdr->reqid, + mdr->slave_to_mds, ESlaveUpdate::OP_COMMIT, + ESlaveUpdate::RMDIR); + mdlog->start_entry(le); + submit_mdlog_entry(le, new C_MDS_CommittedSlave(this, mdr), mdr, __func__); + mdlog->flush(); + } else { + _committed_slave(mdr); + } + } else { + // abort + do_rmdir_rollback(mdr->more()->rollback_bl, mdr->slave_to_mds, mdr); + } +} + +struct C_MDS_LoggedRmdirRollback : public ServerLogContext { + metareqid_t reqid; + CDentry *dn; + CDentry *straydn; + C_MDS_LoggedRmdirRollback(Server *s, MDRequestRef& m, metareqid_t mr, CDentry *d, CDentry *st) + : ServerLogContext(s, m), reqid(mr), dn(d), straydn(st) {} + void finish(int r) override { + server->_rmdir_rollback_finish(mdr, reqid, dn, straydn); + } +}; + +void Server::do_rmdir_rollback(bufferlist &rbl, mds_rank_t master, MDRequestRef& mdr) +{ + // unlink the other rollback methods, the rmdir rollback is only + // needed to record the subtree changes in the journal for inode + // replicas who are auth for empty dirfrags. no actual changes to + // the file system are taking place here, so there is no Mutation. + + rmdir_rollback rollback; + auto p = rbl.cbegin(); + decode(rollback, p); + + dout(10) << "do_rmdir_rollback on " << rollback.reqid << dendl; + mdcache->add_rollback(rollback.reqid, master); // need to finish this update before resolve finishes + ceph_assert(mdr || mds->is_resolve()); + + CDir *dir = mdcache->get_dirfrag(rollback.src_dir); + if (!dir) + dir = mdcache->get_dirfrag(rollback.src_dir.ino, rollback.src_dname); + ceph_assert(dir); + CDentry *dn = dir->lookup(rollback.src_dname); + ceph_assert(dn); + dout(10) << " dn " << *dn << dendl; + CDir *straydir = mdcache->get_dirfrag(rollback.dest_dir); + ceph_assert(straydir); + CDentry *straydn = straydir->lookup(rollback.dest_dname); + ceph_assert(straydn); + dout(10) << " straydn " << *straydn << dendl; + CInode *in = straydn->get_linkage()->get_inode(); + + dn->push_projected_linkage(in); + straydn->push_projected_linkage(); + + if (rollback.snapbl.length() && in->snaprealm) { + bool hadrealm; + auto p = rollback.snapbl.cbegin(); + decode(hadrealm, p); + if (hadrealm) { + decode(in->snaprealm->srnode, p); + } else { + in->snaprealm->merge_to(dir->get_inode()->find_snaprealm()); + } + } + + if (mdr && !mdr->more()->slave_update_journaled) { + ceph_assert(!in->has_subtree_root_dirfrag(mds->get_nodeid())); + + _rmdir_rollback_finish(mdr, rollback.reqid, dn, straydn); + return; + } + + + ESlaveUpdate *le = new ESlaveUpdate(mdlog, "slave_rmdir_rollback", rollback.reqid, master, + ESlaveUpdate::OP_ROLLBACK, ESlaveUpdate::RMDIR); + mdlog->start_entry(le); + + le->commit.add_dir_context(dn->get_dir()); + le->commit.add_primary_dentry(dn, in, true); + // slave: no need to journal straydn + + dout(10) << " noting renamed (unlinked) dir ino " << in->ino() << " in metablob" << dendl; + le->commit.renamed_dirino = in->ino(); + + mdcache->project_subtree_rename(in, straydn->get_dir(), dn->get_dir()); + + submit_mdlog_entry(le, + new C_MDS_LoggedRmdirRollback(this, mdr,rollback.reqid, + dn, straydn), + mdr, __func__); + mdlog->flush(); +} + +void Server::_rmdir_rollback_finish(MDRequestRef& mdr, metareqid_t reqid, CDentry *dn, CDentry *straydn) +{ + dout(10) << "_rmdir_rollback_finish " << reqid << dendl; + + straydn->get_dir()->unlink_inode(straydn); + dn->pop_projected_linkage(); + straydn->pop_projected_linkage(); + + CInode *in = dn->get_linkage()->get_inode(); + mdcache->adjust_subtree_after_rename(in, straydn->get_dir(), + !mdr || mdr->more()->slave_update_journaled); + + if (mds->is_resolve()) { + CDir *root = mdcache->get_subtree_root(straydn->get_dir()); + mdcache->try_trim_non_auth_subtree(root); + } + + if (mdr) + mdcache->request_finish(mdr); + + mdcache->finish_rollback(reqid, mdr); +} + + +/** _dir_is_nonempty[_unlocked] + * + * check if a directory is non-empty (i.e. we can rmdir it). + * + * the unlocked varient this is a fastpath check. we can't really be + * sure until we rdlock the filelock. + */ +bool Server::_dir_is_nonempty_unlocked(MDRequestRef& mdr, CInode *in) +{ + dout(10) << "dir_is_nonempty_unlocked " << *in << dendl; + ceph_assert(in->is_auth()); + + if (in->snaprealm && in->snaprealm->srnode.snaps.size()) + return true; // in a snapshot! + + list<CDir*> ls; + in->get_dirfrags(ls); + for (list<CDir*>::iterator p = ls.begin(); p != ls.end(); ++p) { + CDir *dir = *p; + // is the frag obviously non-empty? + if (dir->is_auth()) { + if (dir->get_projected_fnode()->fragstat.size()) { + dout(10) << "dir_is_nonempty_unlocked dirstat has " + << dir->get_projected_fnode()->fragstat.size() << " items " << *dir << dendl; + return true; + } + } + } + + return false; +} + +bool Server::_dir_is_nonempty(MDRequestRef& mdr, CInode *in) +{ + dout(10) << "dir_is_nonempty " << *in << dendl; + ceph_assert(in->is_auth()); + ceph_assert(in->filelock.can_read(mdr->get_client())); + + frag_info_t dirstat; + version_t dirstat_version = in->get_projected_inode()->dirstat.version; + + list<CDir*> ls; + in->get_dirfrags(ls); + for (list<CDir*>::iterator p = ls.begin(); p != ls.end(); ++p) { + CDir *dir = *p; + const fnode_t *pf = dir->get_projected_fnode(); + if (pf->fragstat.size()) { + dout(10) << "dir_is_nonempty dirstat has " + << pf->fragstat.size() << " items " << *dir << dendl; + return true; + } + + if (pf->accounted_fragstat.version == dirstat_version) + dirstat.add(pf->accounted_fragstat); + else + dirstat.add(pf->fragstat); + } + + return dirstat.size() != in->get_projected_inode()->dirstat.size(); +} + + +// ====================================================== + + +class C_MDS_rename_finish : public ServerLogContext { + CDentry *srcdn; + CDentry *destdn; + CDentry *straydn; +public: + C_MDS_rename_finish(Server *s, MDRequestRef& r, + CDentry *sdn, CDentry *ddn, CDentry *stdn) : + ServerLogContext(s, r), + srcdn(sdn), destdn(ddn), straydn(stdn) { } + void finish(int r) override { + ceph_assert(r == 0); + server->_rename_finish(mdr, srcdn, destdn, straydn); + } +}; + + +/** handle_client_rename + * + * rename master is the destdn auth. this is because cached inodes + * must remain connected. thus, any replica of srci, must also + * replicate destdn, and possibly straydn, so that srci (and + * destdn->inode) remain connected during the rename. + * + * to do this, we freeze srci, then master (destdn auth) verifies that + * all other nodes have also replciated destdn and straydn. note that + * destdn replicas need not also replicate srci. this only works when + * destdn is master. + * + * This function takes responsibility for the passed mdr. + */ +void Server::handle_client_rename(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + dout(7) << "handle_client_rename " << *req << dendl; + + filepath destpath = req->get_filepath(); + filepath srcpath = req->get_filepath2(); + if (destpath.depth() == 0 || srcpath.depth() == 0) { + respond_to_request(mdr, -EINVAL); + return; + } + if (srcpath.is_last_dot_or_dotdot() || destpath.is_last_dot_or_dotdot()) { + respond_to_request(mdr, -EBUSY); + return; + } + + std::string_view destname = destpath.last_dentry(); + + vector<CDentry*>& srctrace = mdr->dn[1]; + vector<CDentry*>& desttrace = mdr->dn[0]; + + MutationImpl::LockOpVec lov; + + CDentry *destdn = rdlock_path_xlock_dentry(mdr, 0, lov, true, false, true); + if (!destdn) return; + dout(10) << " destdn " << *destdn << dendl; + if (mdr->snapid != CEPH_NOSNAP) { + respond_to_request(mdr, -EROFS); + return; + } + CDentry::linkage_t *destdnl = destdn->get_projected_linkage(); + CDir *destdir = destdn->get_dir(); + ceph_assert(destdir->is_auth()); + + CF_MDS_MDRContextFactory cf(mdcache, mdr); + int r = mdcache->path_traverse(mdr, cf, srcpath, &srctrace, NULL, MDS_TRAVERSE_DISCOVER); + if (r > 0) + return; // delayed + if (r < 0) { + if (r == -ESTALE) { + dout(10) << "FAIL on ESTALE but attempting recovery" << dendl; + mdcache->find_ino_peers(srcpath.get_ino(), new C_MDS_TryFindInode(this, mdr)); + } else { + dout(10) << "FAIL on error " << r << dendl; + respond_to_request(mdr, r); + } + return; + + } + ceph_assert(!srctrace.empty()); + CDentry *srcdn = srctrace.back(); + dout(10) << " srcdn " << *srcdn << dendl; + if (srcdn->last != CEPH_NOSNAP) { + respond_to_request(mdr, -EROFS); + return; + } + CDir *srcdir = srcdn->get_dir(); + CDentry::linkage_t *srcdnl = srcdn->get_projected_linkage(); + CInode *srci = srcdnl->get_inode(); + dout(10) << " srci " << *srci << dendl; + + CInode *oldin = 0; + if (!destdnl->is_null()) { + //dout(10) << "dest dn exists " << *destdn << dendl; + oldin = mdcache->get_dentry_inode(destdn, mdr, true); + if (!oldin) return; + dout(10) << " oldin " << *oldin << dendl; + + // non-empty dir? do trivial fast unlocked check, do another check later with read locks + if (oldin->is_dir() && _dir_is_nonempty_unlocked(mdr, oldin)) { + respond_to_request(mdr, -ENOTEMPTY); + return; + } + + // if srcdn is replica, need to make sure its linkage is correct + if (srcdn->is_auth() || + srcdn->lock.can_read(mdr->get_client()) || + (srcdn->lock.is_xlocked() && srcdn->lock.get_xlock_by() == mdr)) { + // mv /some/thing /to/some/existing_other_thing + if (oldin->is_dir() && !srci->is_dir()) { + respond_to_request(mdr, -EISDIR); + return; + } + if (!oldin->is_dir() && srci->is_dir()) { + respond_to_request(mdr, -ENOTDIR); + return; + } + if (srci == oldin && !srcdir->inode->is_stray()) { + respond_to_request(mdr, 0); // no-op. POSIX makes no sense. + return; + } + } + } + + // -- some sanity checks -- + + // src+dest traces _must_ share a common ancestor for locking to prevent orphans + if (destpath.get_ino() != srcpath.get_ino() && + !(req->get_source().is_mds() && + MDS_INO_IS_MDSDIR(srcpath.get_ino()))) { // <-- mds 'rename' out of stray dir is ok! + CInode *srcbase = srctrace[0]->get_dir()->get_inode(); + CInode *destbase = desttrace[0]->get_dir()->get_inode(); + // ok, extend srctrace toward root until it is an ancestor of desttrace. + while (srcbase != destbase && + !srcbase->is_projected_ancestor_of(destbase)) { + CDentry *pdn = srcbase->get_projected_parent_dn(); + srctrace.insert(srctrace.begin(), pdn); + dout(10) << "rename prepending srctrace with " << *pdn << dendl; + srcbase = pdn->get_dir()->get_inode(); + } + + // then, extend destpath until it shares the same parent inode as srcpath. + while (destbase != srcbase) { + CDentry *pdn = destbase->get_projected_parent_dn(); + desttrace.insert(desttrace.begin(), pdn); + lov.add_rdlock(&pdn->lock); + dout(10) << "rename prepending desttrace with " << *pdn << dendl; + destbase = pdn->get_dir()->get_inode(); + } + dout(10) << "rename src and dest traces now share common ancestor " << *destbase << dendl; + } + + // src == dest? + if (srcdir == destdir && srcdn->get_name() == destname) { + dout(7) << "rename src=dest, noop" << dendl; + respond_to_request(mdr, 0); + return; + } + + // dest a child of src? + // e.g. mv /usr /usr/foo + CDentry *pdn = destdir->inode->get_projected_parent_dn(); + while (pdn) { + if (pdn == srcdn) { + dout(7) << "cannot rename item to be a child of itself" << dendl; + respond_to_request(mdr, -EINVAL); + return; + } + pdn = pdn->get_dir()->inode->parent; + } + + // is this a stray migration, reintegration or merge? (sanity checks!) + if (mdr->reqid.name.is_mds() && + !(MDS_INO_IS_MDSDIR(srcpath.get_ino()) && + MDS_INO_IS_MDSDIR(destpath.get_ino())) && + !(destdnl->is_remote() && + destdnl->get_remote_ino() == srci->ino())) { + respond_to_request(mdr, -EINVAL); // actually, this won't reply, but whatev. + return; + } + + bool linkmerge = srcdnl->get_inode() == destdnl->get_inode(); + if (linkmerge) + dout(10) << " this is a link merge" << dendl; + + // -- create stray dentry? -- + CDentry *straydn = NULL; + if (destdnl->is_primary() && !linkmerge) { + straydn = prepare_stray_dentry(mdr, destdnl->get_inode()); + if (!straydn) + return; + dout(10) << " straydn is " << *straydn << dendl; + } else if (mdr->straydn) { + mdr->unpin(mdr->straydn); + mdr->straydn = NULL; + } + + // -- prepare witness list -- + /* + * NOTE: we use _all_ replicas as witnesses. + * this probably isn't totally necessary (esp for file renames), + * but if/when we change that, we have to make sure rejoin is + * sufficiently robust to handle strong rejoins from survivors + * with totally wrong dentry->inode linkage. + * (currently, it can ignore rename effects, because the resolve + * stage will sort them out.) + */ + set<mds_rank_t> witnesses = mdr->more()->extra_witnesses; + if (srcdn->is_auth()) + srcdn->list_replicas(witnesses); + else + witnesses.insert(srcdn->authority().first); + if (srcdnl->is_remote() && !srci->is_auth()) + witnesses.insert(srci->authority().first); + destdn->list_replicas(witnesses); + if (destdnl->is_remote() && !oldin->is_auth()) + witnesses.insert(oldin->authority().first); + dout(10) << " witnesses " << witnesses << ", have " << mdr->more()->witnessed << dendl; + + + // -- locks -- + + // srctrace items. this mirrors locks taken in rdlock_path_xlock_dentry + for (int i=0; i<(int)srctrace.size(); i++) + lov.add_rdlock(&srctrace[i]->lock); + lov.add_xlock(&srcdn->lock); + mds_rank_t srcdirauth = srcdir->authority().first; + if (srcdirauth != mds->get_nodeid()) { + dout(10) << " will remote_wrlock srcdir scatterlocks on mds." << srcdirauth << dendl; + lov.add_remote_wrlock(&srcdir->inode->filelock, srcdirauth); + lov.add_remote_wrlock(&srcdir->inode->nestlock, srcdirauth); + if (srci->is_dir()) + lov.add_rdlock(&srci->dirfragtreelock); + } else { + lov.add_wrlock(&srcdir->inode->filelock); + lov.add_wrlock(&srcdir->inode->nestlock); + } + mds->locker->include_snap_rdlocks(srcdir->inode, lov); + + // straydn? + if (straydn) { + lov.add_wrlock(&straydn->get_dir()->inode->filelock); + lov.add_wrlock(&straydn->get_dir()->inode->nestlock); + lov.add_xlock(&straydn->lock); + } + + // xlock versionlock on dentries if there are witnesses. + // replicas can't see projected dentry linkages, and will get + // confused if we try to pipeline things. + if (!witnesses.empty()) { + // take xlock on all projected ancestor dentries for srcdn and destdn. + // this ensures the srcdn and destdn can be traversed to by the witnesses. + for (int i= 0; i<(int)srctrace.size(); i++) { + if (srctrace[i]->is_auth() && srctrace[i]->is_projected()) + lov.add_xlock(&srctrace[i]->versionlock); + } + for (int i=0; i<(int)desttrace.size(); i++) { + if (desttrace[i]->is_auth() && desttrace[i]->is_projected()) + lov.add_xlock(&desttrace[i]->versionlock); + } + // xlock srci and oldin's primary dentries, so witnesses can call + // open_remote_ino() with 'want_locked=true' when the srcdn or destdn + // is traversed. + if (srcdnl->is_remote()) + lov.add_xlock(&srci->get_projected_parent_dn()->lock); + if (destdnl->is_remote()) + lov.add_xlock(&oldin->get_projected_parent_dn()->lock); + } + + // we need to update srci's ctime. xlock its least contended lock to do that... + lov.add_xlock(&srci->linklock); + lov.add_xlock(&srci->snaplock); + + if (oldin) { + // xlock oldin (for nlink--) + lov.add_xlock(&oldin->linklock); + lov.add_xlock(&oldin->snaplock); + if (oldin->is_dir()) + lov.add_rdlock(&oldin->filelock); // to verify it's empty + } + + CInode *auth_pin_freeze = !srcdn->is_auth() && srcdnl->is_primary() ? srci : NULL; + if (!mds->locker->acquire_locks(mdr, lov, auth_pin_freeze)) + return; + + if (linkmerge) + ceph_assert(srcdir->inode->is_stray() && srcdnl->is_primary() && destdnl->is_remote()); + + if ((!mdr->has_more() || mdr->more()->witnessed.empty())) { + if (!check_access(mdr, srcdir->get_inode(), MAY_WRITE)) + return; + + if (!check_access(mdr, destdn->get_dir()->get_inode(), MAY_WRITE)) + return; + + if (!check_fragment_space(mdr, destdn->get_dir())) + return; + + if (!check_access(mdr, srci, MAY_WRITE)) + return; + } + + // with read lock, really verify oldin is empty + if (oldin && + oldin->is_dir() && + _dir_is_nonempty(mdr, oldin)) { + respond_to_request(mdr, -ENOTEMPTY); + return; + } + + /* project_snaprealm_past_parent() will do this job + * + // moving between snaprealms? + if (srcdnl->is_primary() && srci->is_multiversion() && !srci->snaprealm) { + SnapRealm *srcrealm = srci->find_snaprealm(); + SnapRealm *destrealm = destdn->get_dir()->inode->find_snaprealm(); + if (srcrealm != destrealm && + (srcrealm->get_newest_seq() + 1 > srcdn->first || + destrealm->get_newest_seq() + 1 > srcdn->first)) { + dout(10) << " renaming between snaprealms, creating snaprealm for " << *srci << dendl; + mdcache->snaprealm_create(mdr, srci); + return; + } + } + */ + + SnapRealm *dest_realm = nullptr; + SnapRealm *src_realm = nullptr; + if (!linkmerge) { + dest_realm = destdir->inode->find_snaprealm(); + if (srcdir->inode == destdir->inode) + src_realm = dest_realm; + else + src_realm = srcdir->inode->find_snaprealm(); + if (src_realm != dest_realm && + src_realm->get_subvolume_ino() != dest_realm->get_subvolume_ino()) { + respond_to_request(mdr, -EXDEV); + return; + } + } + + ceph_assert(g_conf()->mds_kill_rename_at != 1); + + // -- open all srcdn inode frags, if any -- + // we need these open so that auth can properly delegate from inode to dirfrags + // after the inode is _ours_. + if (srcdnl->is_primary() && + !srcdn->is_auth() && + srci->is_dir()) { + dout(10) << "srci is remote dir, setting stickydirs and opening all frags" << dendl; + mdr->set_stickydirs(srci); + + frag_vec_t leaves; + srci->dirfragtree.get_leaves(leaves); + for (const auto& leaf : leaves) { + CDir *dir = srci->get_dirfrag(leaf); + if (!dir) { + dout(10) << " opening " << leaf << " under " << *srci << dendl; + mdcache->open_remote_dirfrag(srci, leaf, new C_MDS_RetryRequest(mdcache, mdr)); + return; + } + } + } + + // -- prepare snaprealm --- + + if (linkmerge) { + if (!mdr->more()->srci_srnode && + srci->get_projected_inode()->nlink == 1 && + srci->is_projected_snaprealm_global()) { + sr_t *new_srnode = srci->prepare_new_srnode(0); + srci->record_snaprealm_parent_dentry(new_srnode, nullptr, destdn, false); + + srci->clear_snaprealm_global(new_srnode); + mdr->more()->srci_srnode = new_srnode; + } + } else { + if (oldin && !mdr->more()->desti_srnode) { + if (oldin->is_projected_snaprealm_global()) { + sr_t *new_srnode = oldin->prepare_new_srnode(0); + oldin->record_snaprealm_parent_dentry(new_srnode, dest_realm, destdn, destdnl->is_primary()); + // dropping the last linkage or dropping the last remote linkage, + // detch the inode from global snaprealm + auto nlink = oldin->get_projected_inode()->nlink; + if (nlink == 1 || + (nlink == 2 && !destdnl->is_primary() && + !oldin->get_projected_parent_dir()->inode->is_stray())) + oldin->clear_snaprealm_global(new_srnode); + mdr->more()->desti_srnode = new_srnode; + } else if (destdnl->is_primary()) { + snapid_t follows = dest_realm->get_newest_seq(); + if (oldin->snaprealm || follows + 1 > oldin->get_oldest_snap()) { + sr_t *new_srnode = oldin->prepare_new_srnode(follows); + oldin->record_snaprealm_past_parent(new_srnode, straydn->get_dir()->inode->find_snaprealm()); + mdr->more()->desti_srnode = new_srnode; + } + } + } + if (!mdr->more()->srci_srnode) { + if (srci->is_projected_snaprealm_global()) { + sr_t *new_srnode = srci->prepare_new_srnode(0); + srci->record_snaprealm_parent_dentry(new_srnode, src_realm, srcdn, srcdnl->is_primary()); + mdr->more()->srci_srnode = new_srnode; + } else if (srcdnl->is_primary()) { + snapid_t follows = src_realm->get_newest_seq(); + if (src_realm != dest_realm && + (srci->snaprealm || follows + 1 > srci->get_oldest_snap())) { + sr_t *new_srnode = srci->prepare_new_srnode(follows); + srci->record_snaprealm_past_parent(new_srnode, dest_realm); + mdr->more()->srci_srnode = new_srnode; + } + } + } + } + + // -- prepare witnesses -- + + // do srcdn auth last + mds_rank_t last = MDS_RANK_NONE; + if (!srcdn->is_auth()) { + last = srcdn->authority().first; + mdr->more()->srcdn_auth_mds = last; + // ask auth of srci to mark srci as ambiguous auth if more than two MDS + // are involved in the rename operation. + if (srcdnl->is_primary() && !mdr->more()->is_ambiguous_auth) { + dout(10) << " preparing ambiguous auth for srci" << dendl; + ceph_assert(mdr->more()->is_remote_frozen_authpin); + ceph_assert(mdr->more()->rename_inode == srci); + _rename_prepare_witness(mdr, last, witnesses, srctrace, desttrace, straydn); + return; + } + } + + for (set<mds_rank_t>::iterator p = witnesses.begin(); + p != witnesses.end(); + ++p) { + if (*p == last) continue; // do it last! + if (mdr->more()->witnessed.count(*p)) { + dout(10) << " already witnessed by mds." << *p << dendl; + } else if (mdr->more()->waiting_on_slave.count(*p)) { + dout(10) << " already waiting on witness mds." << *p << dendl; + } else { + if (!_rename_prepare_witness(mdr, *p, witnesses, srctrace, desttrace, straydn)) + return; + } + } + if (!mdr->more()->waiting_on_slave.empty()) + return; // we're waiting for a witness. + + if (last != MDS_RANK_NONE && mdr->more()->witnessed.count(last) == 0) { + dout(10) << " preparing last witness (srcdn auth)" << dendl; + ceph_assert(mdr->more()->waiting_on_slave.count(last) == 0); + _rename_prepare_witness(mdr, last, witnesses, srctrace, desttrace, straydn); + return; + } + + // test hack: bail after slave does prepare, so we can verify it's _live_ rollback. + if (!mdr->more()->slaves.empty() && !srci->is_dir()) + ceph_assert(g_conf()->mds_kill_rename_at != 3); + if (!mdr->more()->slaves.empty() && srci->is_dir()) + ceph_assert(g_conf()->mds_kill_rename_at != 4); + + // -- declare now -- + mdr->set_mds_stamp(ceph_clock_now()); + + // -- prepare journal entry -- + mdr->ls = mdlog->get_current_segment(); + EUpdate *le = new EUpdate(mdlog, "rename"); + mdlog->start_entry(le); + le->metablob.add_client_req(mdr->reqid, mdr->client_request->get_oldest_client_tid()); + if (!mdr->more()->witnessed.empty()) { + dout(20) << " noting uncommitted_slaves " << mdr->more()->witnessed << dendl; + + le->reqid = mdr->reqid; + le->had_slaves = true; + + mdcache->add_uncommitted_master(mdr->reqid, mdr->ls, mdr->more()->witnessed); + // no need to send frozen auth pin to recovring auth MDS of srci + mdr->more()->is_remote_frozen_authpin = false; + } + + _rename_prepare(mdr, &le->metablob, &le->client_map, srcdn, destdn, straydn); + if (le->client_map.length()) + le->cmapv = mds->sessionmap.get_projected(); + + // -- commit locally -- + C_MDS_rename_finish *fin = new C_MDS_rename_finish(this, mdr, srcdn, destdn, straydn); + + journal_and_reply(mdr, srci, destdn, le, fin); + mds->balancer->maybe_fragment(destdn->get_dir(), false); +} + + +void Server::_rename_finish(MDRequestRef& mdr, CDentry *srcdn, CDentry *destdn, CDentry *straydn) +{ + dout(10) << "_rename_finish " << *mdr << dendl; + + if (!mdr->more()->witnessed.empty()) + mdcache->logged_master_update(mdr->reqid); + + // apply + _rename_apply(mdr, srcdn, destdn, straydn); + + mdcache->send_dentry_link(destdn, mdr); + + CDentry::linkage_t *destdnl = destdn->get_linkage(); + CInode *in = destdnl->get_inode(); + bool need_eval = mdr->more()->cap_imports.count(in); + + // test hack: test slave commit + if (!mdr->more()->slaves.empty() && !in->is_dir()) + ceph_assert(g_conf()->mds_kill_rename_at != 5); + if (!mdr->more()->slaves.empty() && in->is_dir()) + ceph_assert(g_conf()->mds_kill_rename_at != 6); + + // bump popularity + mds->balancer->hit_dir(srcdn->get_dir(), META_POP_IWR); + if (destdnl->is_remote() && in->is_auth()) + mds->balancer->hit_inode(in, META_POP_IWR); + + // did we import srci? if so, explicitly ack that import that, before we unlock and reply. + + ceph_assert(g_conf()->mds_kill_rename_at != 7); + + // reply + respond_to_request(mdr, 0); + + if (need_eval) + mds->locker->eval(in, CEPH_CAP_LOCKS, true); + + // clean up? + // respond_to_request() drops locks. So stray reintegration can race with us. + if (straydn && !straydn->get_projected_linkage()->is_null()) { + mdcache->notify_stray(straydn); + } +} + + + +// helpers + +bool Server::_rename_prepare_witness(MDRequestRef& mdr, mds_rank_t who, set<mds_rank_t> &witnesse, + vector<CDentry*>& srctrace, vector<CDentry*>& dsttrace, CDentry *straydn) +{ + if (mds->is_cluster_degraded() && + !mds->mdsmap->is_clientreplay_or_active_or_stopping(who)) { + dout(10) << "_rename_prepare_witness mds." << who << " is not active" << dendl; + if (mdr->more()->waiting_on_slave.empty()) + mds->wait_for_active_peer(who, new C_MDS_RetryRequest(mdcache, mdr)); + return false; + } + + dout(10) << "_rename_prepare_witness mds." << who << dendl; + auto req = MMDSSlaveRequest::create(mdr->reqid, mdr->attempt, MMDSSlaveRequest::OP_RENAMEPREP); + + req->srcdnpath = filepath(srctrace.front()->get_dir()->ino()); + for (auto dn : srctrace) + req->srcdnpath.push_dentry(dn->get_name()); + req->destdnpath = filepath(dsttrace.front()->get_dir()->ino()); + for (auto dn : dsttrace) + req->destdnpath.push_dentry(dn->get_name()); + if (straydn) + mdcache->replicate_stray(straydn, who, req->straybl); + + if (mdr->more()->srci_srnode) + encode(*mdr->more()->srci_srnode, req->srci_snapbl); + if (mdr->more()->desti_srnode) + encode(*mdr->more()->desti_srnode, req->desti_snapbl); + + req->srcdn_auth = mdr->more()->srcdn_auth_mds; + + // srcdn auth will verify our current witness list is sufficient + req->witnesses = witnesse; + + req->op_stamp = mdr->get_op_stamp(); + mds->send_message_mds(req, who); + + ceph_assert(mdr->more()->waiting_on_slave.count(who) == 0); + mdr->more()->waiting_on_slave.insert(who); + return true; +} + +version_t Server::_rename_prepare_import(MDRequestRef& mdr, CDentry *srcdn, bufferlist *client_map_bl) +{ + version_t oldpv = mdr->more()->inode_import_v; + + CDentry::linkage_t *srcdnl = srcdn->get_linkage(); + + /* import node */ + auto blp = mdr->more()->inode_import.cbegin(); + + // imported caps + map<client_t,entity_inst_t> client_map; + map<client_t, client_metadata_t> client_metadata_map; + decode(client_map, blp); + decode(client_metadata_map, blp); + prepare_force_open_sessions(client_map, client_metadata_map, + mdr->more()->imported_session_map); + encode(client_map, *client_map_bl, mds->mdsmap->get_up_features()); + encode(client_metadata_map, *client_map_bl); + + list<ScatterLock*> updated_scatterlocks; + mdcache->migrator->decode_import_inode(srcdn, blp, srcdn->authority().first, mdr->ls, + mdr->more()->cap_imports, updated_scatterlocks); + + // hack: force back to !auth and clean, temporarily + srcdnl->get_inode()->state_clear(CInode::STATE_AUTH); + srcdnl->get_inode()->mark_clean(); + + return oldpv; +} + +bool Server::_need_force_journal(CInode *diri, bool empty) +{ + std::vector<CDir*> dirs; + diri->get_dirfrags(dirs); + + bool force_journal = false; + if (empty) { + for (const auto& dir : dirs) { + if (dir->is_subtree_root() && dir->get_dir_auth().first == mds->get_nodeid()) { + dout(10) << " frag " << dir->get_frag() << " is auth subtree dirfrag, will force journal" << dendl; + force_journal = true; + break; + } else + dout(20) << " frag " << dir->get_frag() << " is not auth subtree dirfrag" << dendl; + } + } else { + // see if any children of our frags are auth subtrees. + std::vector<CDir*> subtrees; + mdcache->get_subtrees(subtrees); + dout(10) << " subtrees " << subtrees << " frags " << dirs << dendl; + for (const auto& dir : dirs) { + for (const auto& subtree : subtrees) { + if (dir->contains(subtree)) { + if (subtree->get_dir_auth().first == mds->get_nodeid()) { + dout(10) << " frag " << dir->get_frag() << " contains (maybe) auth subtree, will force journal " + << *subtree << dendl; + force_journal = true; + break; + } else + dout(20) << " frag " << dir->get_frag() << " contains but isn't auth for " << *subtree << dendl; + } else + dout(20) << " frag " << dir->get_frag() << " does not contain " << *subtree << dendl; + } + if (force_journal) + break; + } + } + return force_journal; +} + +void Server::_rename_prepare(MDRequestRef& mdr, + EMetaBlob *metablob, bufferlist *client_map_bl, + CDentry *srcdn, CDentry *destdn, CDentry *straydn) +{ + dout(10) << "_rename_prepare " << *mdr << " " << *srcdn << " " << *destdn << dendl; + if (straydn) + dout(10) << " straydn " << *straydn << dendl; + + CDentry::linkage_t *srcdnl = srcdn->get_projected_linkage(); + CDentry::linkage_t *destdnl = destdn->get_projected_linkage(); + CInode *srci = srcdnl->get_inode(); + CInode *oldin = destdnl->get_inode(); + + // primary+remote link merge? + bool linkmerge = (srci == oldin); + if (linkmerge) + ceph_assert(srcdnl->is_primary() && destdnl->is_remote()); + bool silent = srcdn->get_dir()->inode->is_stray(); + + bool force_journal_dest = false; + if (srci->is_dir() && !destdn->is_auth()) { + if (srci->is_auth()) { + // if we are auth for srci and exporting it, force journal because journal replay needs + // the source inode to create auth subtrees. + dout(10) << " we are exporting srci, will force journal destdn" << dendl; + force_journal_dest = true; + } else + force_journal_dest = _need_force_journal(srci, false); + } + + bool force_journal_stray = false; + if (oldin && oldin->is_dir() && straydn && !straydn->is_auth()) + force_journal_stray = _need_force_journal(oldin, true); + + if (linkmerge) + dout(10) << " merging remote and primary links to the same inode" << dendl; + if (silent) + dout(10) << " reintegrating stray; will avoid changing nlink or dir mtime" << dendl; + if (force_journal_dest) + dout(10) << " forcing journal destdn because we (will) have auth subtrees nested beneath it" << dendl; + if (force_journal_stray) + dout(10) << " forcing journal straydn because we (will) have auth subtrees nested beneath it" << dendl; + + if (srci->is_dir() && (destdn->is_auth() || force_journal_dest)) { + dout(10) << " noting renamed dir ino " << srci->ino() << " in metablob" << dendl; + metablob->renamed_dirino = srci->ino(); + } else if (oldin && oldin->is_dir() && force_journal_stray) { + dout(10) << " noting rename target dir " << oldin->ino() << " in metablob" << dendl; + metablob->renamed_dirino = oldin->ino(); + } + + // prepare + CInode::mempool_inode *spi = 0; // renamed inode + CInode::mempool_inode *tpi = 0; // target/overwritten inode + + // target inode + if (!linkmerge) { + if (destdnl->is_primary()) { + ceph_assert(straydn); // moving to straydn. + // link--, and move. + if (destdn->is_auth()) { + auto &pi= oldin->project_inode(); //project_snaprealm + pi.inode.version = straydn->pre_dirty(pi.inode.version); + pi.inode.update_backtrace(); + tpi = &pi.inode; + } + straydn->push_projected_linkage(oldin); + } else if (destdnl->is_remote()) { + // nlink-- targeti + if (oldin->is_auth()) { + auto &pi = oldin->project_inode(); + pi.inode.version = oldin->pre_dirty(); + tpi = &pi.inode; + } + } + } + + // dest + if (srcdnl->is_remote()) { + if (!linkmerge) { + // destdn + if (destdn->is_auth()) + mdr->more()->pvmap[destdn] = destdn->pre_dirty(); + destdn->push_projected_linkage(srcdnl->get_remote_ino(), srcdnl->get_remote_d_type()); + // srci + if (srci->is_auth()) { + auto &pi = srci->project_inode(); + pi.inode.version = srci->pre_dirty(); + spi = &pi.inode; + } + } else { + dout(10) << " will merge remote onto primary link" << dendl; + if (destdn->is_auth()) { + auto &pi = oldin->project_inode(); + pi.inode.version = mdr->more()->pvmap[destdn] = destdn->pre_dirty(oldin->inode.version); + spi = &pi.inode; + } + } + } else { // primary + if (destdn->is_auth()) { + version_t oldpv; + if (srcdn->is_auth()) + oldpv = srci->get_projected_version(); + else { + oldpv = _rename_prepare_import(mdr, srcdn, client_map_bl); + + // note which dirfrags have child subtrees in the journal + // event, so that we can open those (as bounds) during replay. + if (srci->is_dir()) { + list<CDir*> ls; + srci->get_dirfrags(ls); + for (list<CDir*>::iterator p = ls.begin(); p != ls.end(); ++p) { + CDir *dir = *p; + if (!dir->is_auth()) + metablob->renamed_dir_frags.push_back(dir->get_frag()); + } + dout(10) << " noting renamed dir open frags " << metablob->renamed_dir_frags << dendl; + } + } + auto &pi = srci->project_inode(); // project snaprealm if srcdnl->is_primary + // & srcdnl->snaprealm + pi.inode.version = mdr->more()->pvmap[destdn] = destdn->pre_dirty(oldpv); + pi.inode.update_backtrace(); + spi = &pi.inode; + } + destdn->push_projected_linkage(srci); + } + + // src + if (srcdn->is_auth()) + mdr->more()->pvmap[srcdn] = srcdn->pre_dirty(); + srcdn->push_projected_linkage(); // push null linkage + + if (!silent) { + if (spi) { + spi->ctime = mdr->get_op_stamp(); + if (mdr->get_op_stamp() > spi->rstat.rctime) + spi->rstat.rctime = mdr->get_op_stamp(); + spi->change_attr++; + if (linkmerge) + spi->nlink--; + } + if (tpi) { + tpi->ctime = mdr->get_op_stamp(); + if (mdr->get_op_stamp() > tpi->rstat.rctime) + tpi->rstat.rctime = mdr->get_op_stamp(); + tpi->change_attr++; + { + std::string t; + destdn->make_path_string(t, true); + tpi->stray_prior_path = std::move(t); + } + tpi->nlink--; + if (tpi->nlink == 0) + oldin->state_set(CInode::STATE_ORPHAN); + } + } + + // prepare nesting, mtime updates + int predirty_dir = silent ? 0:PREDIRTY_DIR; + + // guarantee stray dir is processed first during journal replay. unlink the old inode, + // then link the source inode to destdn + if (destdnl->is_primary()) { + ceph_assert(straydn); + if (straydn->is_auth()) { + metablob->add_dir_context(straydn->get_dir()); + metablob->add_dir(straydn->get_dir(), true); + } + } + + // sub off target + if (destdn->is_auth() && !destdnl->is_null()) { + mdcache->predirty_journal_parents(mdr, metablob, oldin, destdn->get_dir(), + (destdnl->is_primary() ? PREDIRTY_PRIMARY:0)|predirty_dir, -1); + if (destdnl->is_primary()) { + ceph_assert(straydn); + mdcache->predirty_journal_parents(mdr, metablob, oldin, straydn->get_dir(), + PREDIRTY_PRIMARY|PREDIRTY_DIR, 1); + } + } + + // move srcdn + int predirty_primary = (srcdnl->is_primary() && srcdn->get_dir() != destdn->get_dir()) ? PREDIRTY_PRIMARY:0; + int flags = predirty_dir | predirty_primary; + if (srcdn->is_auth()) + mdcache->predirty_journal_parents(mdr, metablob, srci, srcdn->get_dir(), PREDIRTY_SHALLOW|flags, -1); + if (destdn->is_auth()) + mdcache->predirty_journal_parents(mdr, metablob, srci, destdn->get_dir(), flags, 1); + + // add it all to the metablob + // target inode + if (!linkmerge) { + if (destdnl->is_primary()) { + ceph_assert(straydn); + if (destdn->is_auth()) { + // project snaprealm, too + if (auto& desti_srnode = mdr->more()->desti_srnode) { + oldin->project_snaprealm(desti_srnode); + if (tpi->nlink == 0) + ceph_assert(!desti_srnode->is_parent_global()); + desti_srnode = NULL; + } + straydn->first = mdcache->get_global_snaprealm()->get_newest_seq() + 1; + metablob->add_primary_dentry(straydn, oldin, true, true); + } else if (force_journal_stray) { + dout(10) << " forced journaling straydn " << *straydn << dendl; + metablob->add_dir_context(straydn->get_dir()); + metablob->add_primary_dentry(straydn, oldin, true); + } + } else if (destdnl->is_remote()) { + if (oldin->is_auth()) { + sr_t *new_srnode = NULL; + if (mdr->slave_request) { + if (mdr->slave_request->desti_snapbl.length() > 0) { + new_srnode = new sr_t(); + auto p = mdr->slave_request->desti_snapbl.cbegin(); + decode(*new_srnode, p); + } + } else if (auto& desti_srnode = mdr->more()->desti_srnode) { + new_srnode = desti_srnode; + desti_srnode = NULL; + } + if (new_srnode) { + oldin->project_snaprealm(new_srnode); + if (tpi->nlink == 0) + ceph_assert(!new_srnode->is_parent_global()); + } + // auth for targeti + metablob->add_dir_context(oldin->get_projected_parent_dir()); + mdcache->journal_cow_dentry(mdr.get(), metablob, oldin->get_projected_parent_dn(), + CEPH_NOSNAP, 0, destdnl); + metablob->add_primary_dentry(oldin->get_projected_parent_dn(), oldin, true); + } + } + } + + // dest + if (srcdnl->is_remote()) { + ceph_assert(!linkmerge); + if (destdn->is_auth() && !destdnl->is_null()) + mdcache->journal_cow_dentry(mdr.get(), metablob, destdn, CEPH_NOSNAP, 0, destdnl); + else + destdn->first = mdcache->get_global_snaprealm()->get_newest_seq() + 1; + + if (destdn->is_auth()) + metablob->add_remote_dentry(destdn, true, srcdnl->get_remote_ino(), srcdnl->get_remote_d_type()); + + if (srci->is_auth() ) { // it's remote + if (mdr->slave_request) { + if (mdr->slave_request->srci_snapbl.length() > 0) { + sr_t *new_srnode = new sr_t(); + auto p = mdr->slave_request->srci_snapbl.cbegin(); + decode(*new_srnode, p); + srci->project_snaprealm(new_srnode); + } + } else if (auto& srci_srnode = mdr->more()->srci_srnode) { + srci->project_snaprealm(srci_srnode); + srci_srnode = NULL; + } + + CDentry *srci_pdn = srci->get_projected_parent_dn(); + metablob->add_dir_context(srci_pdn->get_dir()); + mdcache->journal_cow_dentry(mdr.get(), metablob, srci_pdn, CEPH_NOSNAP, 0, srcdnl); + metablob->add_primary_dentry(srci_pdn, srci, true); + } + } else if (srcdnl->is_primary()) { + // project snap parent update? + if (destdn->is_auth()) { + if (auto& srci_srnode = mdr->more()->srci_srnode) { + srci->project_snaprealm(srci_srnode); + srci_srnode = NULL; + } + } + + if (destdn->is_auth() && !destdnl->is_null()) + mdcache->journal_cow_dentry(mdr.get(), metablob, destdn, CEPH_NOSNAP, 0, destdnl); + + destdn->first = mdcache->get_global_snaprealm()->get_newest_seq() + 1; + + if (destdn->is_auth()) + metablob->add_primary_dentry(destdn, srci, true, true); + else if (force_journal_dest) { + dout(10) << " forced journaling destdn " << *destdn << dendl; + metablob->add_dir_context(destdn->get_dir()); + metablob->add_primary_dentry(destdn, srci, true); + if (srcdn->is_auth() && srci->is_dir()) { + // journal new subtrees root dirfrags + list<CDir*> ls; + srci->get_dirfrags(ls); + for (list<CDir*>::iterator p = ls.begin(); p != ls.end(); ++p) { + CDir *dir = *p; + if (dir->is_auth()) + metablob->add_dir(dir, true); + } + } + } + } + + // src + if (srcdn->is_auth()) { + dout(10) << " journaling srcdn " << *srcdn << dendl; + mdcache->journal_cow_dentry(mdr.get(), metablob, srcdn, CEPH_NOSNAP, 0, srcdnl); + // also journal the inode in case we need do slave rename rollback. It is Ok to add + // both primary and NULL dentries. Because during journal replay, null dentry is + // processed after primary dentry. + if (srcdnl->is_primary() && !srci->is_dir() && !destdn->is_auth()) + metablob->add_primary_dentry(srcdn, srci, true); + metablob->add_null_dentry(srcdn, true); + } else + dout(10) << " NOT journaling srcdn " << *srcdn << dendl; + + // make renamed inode first track the dn + if (srcdnl->is_primary() && destdn->is_auth()) { + ceph_assert(srci->first <= destdn->first); + srci->first = destdn->first; + } + // make stray inode first track the straydn + if (straydn && straydn->is_auth()) { + ceph_assert(oldin->first <= straydn->first); + oldin->first = straydn->first; + } + + if (oldin && oldin->is_dir()) { + ceph_assert(straydn); + mdcache->project_subtree_rename(oldin, destdn->get_dir(), straydn->get_dir()); + } + if (srci->is_dir()) + mdcache->project_subtree_rename(srci, srcdn->get_dir(), destdn->get_dir()); + +} + + +void Server::_rename_apply(MDRequestRef& mdr, CDentry *srcdn, CDentry *destdn, CDentry *straydn) +{ + dout(10) << "_rename_apply " << *mdr << " " << *srcdn << " " << *destdn << dendl; + dout(10) << " pvs " << mdr->more()->pvmap << dendl; + + CDentry::linkage_t *srcdnl = srcdn->get_linkage(); + CDentry::linkage_t *destdnl = destdn->get_linkage(); + + CInode *oldin = destdnl->get_inode(); + + // primary+remote link merge? + bool linkmerge = (srcdnl->get_inode() == oldin); + if (linkmerge) + ceph_assert(srcdnl->is_primary() || destdnl->is_remote()); + + bool new_in_snaprealm = false; + bool new_oldin_snaprealm = false; + + // target inode + if (!linkmerge) { + if (destdnl->is_primary()) { + ceph_assert(straydn); + dout(10) << "straydn is " << *straydn << dendl; + + // if there is newly created snaprealm, need to split old snaprealm's + // inodes_with_caps. So pop snaprealm before linkage changes. + if (destdn->is_auth()) { + bool hadrealm = (oldin->snaprealm ? true : false); + oldin->early_pop_projected_snaprealm(); + new_oldin_snaprealm = (oldin->snaprealm && !hadrealm); + } else { + ceph_assert(mdr->slave_request); + if (mdr->slave_request->desti_snapbl.length()) { + new_oldin_snaprealm = !oldin->snaprealm; + oldin->decode_snap_blob(mdr->slave_request->desti_snapbl); + ceph_assert(oldin->snaprealm); + ceph_assert(oldin->snaprealm->have_past_parents_open()); + } + } + + destdn->get_dir()->unlink_inode(destdn, false); + + straydn->pop_projected_linkage(); + if (mdr->is_slave() && !mdr->more()->slave_update_journaled) + ceph_assert(!straydn->is_projected()); // no other projected + + // nlink-- targeti + if (destdn->is_auth()) + oldin->pop_and_dirty_projected_inode(mdr->ls); + + mdcache->touch_dentry_bottom(straydn); // drop dn as quickly as possible. + } else if (destdnl->is_remote()) { + destdn->get_dir()->unlink_inode(destdn, false); + if (oldin->is_auth()) { + oldin->pop_and_dirty_projected_inode(mdr->ls); + } else if (mdr->slave_request) { + if (mdr->slave_request->desti_snapbl.length() > 0) { + ceph_assert(oldin->snaprealm); + oldin->decode_snap_blob(mdr->slave_request->desti_snapbl); + } + } else if (auto& desti_srnode = mdr->more()->desti_srnode) { + delete desti_srnode; + desti_srnode = NULL; + } + } + } + + // unlink src before we relink it at dest + CInode *in = srcdnl->get_inode(); + ceph_assert(in); + + bool srcdn_was_remote = srcdnl->is_remote(); + if (!srcdn_was_remote) { + // if there is newly created snaprealm, need to split old snaprealm's + // inodes_with_caps. So pop snaprealm before linkage changes. + if (destdn->is_auth()) { + bool hadrealm = (in->snaprealm ? true : false); + in->early_pop_projected_snaprealm(); + new_in_snaprealm = (in->snaprealm && !hadrealm); + } else { + ceph_assert(mdr->slave_request); + if (mdr->slave_request->srci_snapbl.length()) { + new_in_snaprealm = !in->snaprealm; + in->decode_snap_blob(mdr->slave_request->srci_snapbl); + ceph_assert(in->snaprealm); + ceph_assert(in->snaprealm->have_past_parents_open()); + } + } + } + + srcdn->get_dir()->unlink_inode(srcdn); + + // dest + if (srcdn_was_remote) { + if (!linkmerge) { + // destdn + destdnl = destdn->pop_projected_linkage(); + if (mdr->is_slave() && !mdr->more()->slave_update_journaled) + ceph_assert(!destdn->is_projected()); // no other projected + + destdn->link_remote(destdnl, in); + if (destdn->is_auth()) + destdn->mark_dirty(mdr->more()->pvmap[destdn], mdr->ls); + // in + if (in->is_auth()) { + in->pop_and_dirty_projected_inode(mdr->ls); + } else if (mdr->slave_request) { + if (mdr->slave_request->srci_snapbl.length() > 0) { + ceph_assert(in->snaprealm); + in->decode_snap_blob(mdr->slave_request->srci_snapbl); + } + } else if (auto& srci_srnode = mdr->more()->srci_srnode) { + delete srci_srnode; + srci_srnode = NULL; + } + } else { + dout(10) << "merging remote onto primary link" << dendl; + oldin->pop_and_dirty_projected_inode(mdr->ls); + } + } else { // primary + if (linkmerge) { + dout(10) << "merging primary onto remote link" << dendl; + destdn->get_dir()->unlink_inode(destdn, false); + } + destdnl = destdn->pop_projected_linkage(); + if (mdr->is_slave() && !mdr->more()->slave_update_journaled) + ceph_assert(!destdn->is_projected()); // no other projected + + // srcdn inode import? + if (!srcdn->is_auth() && destdn->is_auth()) { + ceph_assert(mdr->more()->inode_import.length() > 0); + + map<client_t,Capability::Import> imported_caps; + + // finish cap imports + finish_force_open_sessions(mdr->more()->imported_session_map); + if (mdr->more()->cap_imports.count(destdnl->get_inode())) { + mdcache->migrator->finish_import_inode_caps(destdnl->get_inode(), + mdr->more()->srcdn_auth_mds, true, + mdr->more()->imported_session_map, + mdr->more()->cap_imports[destdnl->get_inode()], + imported_caps); + } + + mdr->more()->inode_import.clear(); + encode(imported_caps, mdr->more()->inode_import); + + /* hack: add an auth pin for each xlock we hold. These were + * remote xlocks previously but now they're local and + * we're going to try and unpin when we xlock_finish. */ + + for (auto i = mdr->locks.lower_bound(&destdnl->get_inode()->versionlock); + i != mdr->locks.end(); + ++i) { + SimpleLock *lock = i->lock; + if (lock->get_parent() != destdnl->get_inode()) + break; + if (i->is_xlock() && !lock->is_locallock()) + mds->locker->xlock_import(lock); + } + + // hack: fix auth bit + in->state_set(CInode::STATE_AUTH); + + mdr->clear_ambiguous_auth(); + } + + if (destdn->is_auth()) + in->pop_and_dirty_projected_inode(mdr->ls); + } + + // src + if (srcdn->is_auth()) + srcdn->mark_dirty(mdr->more()->pvmap[srcdn], mdr->ls); + srcdn->pop_projected_linkage(); + if (mdr->is_slave() && !mdr->more()->slave_update_journaled) + ceph_assert(!srcdn->is_projected()); // no other projected + + // apply remaining projected inodes (nested) + mdr->apply(); + + // update subtree map? + if (destdnl->is_primary() && in->is_dir()) + mdcache->adjust_subtree_after_rename(in, srcdn->get_dir(), true); + + if (straydn && oldin->is_dir()) + mdcache->adjust_subtree_after_rename(oldin, destdn->get_dir(), true); + + if (new_oldin_snaprealm) + mdcache->do_realm_invalidate_and_update_notify(oldin, CEPH_SNAP_OP_SPLIT, false); + if (new_in_snaprealm) + mdcache->do_realm_invalidate_and_update_notify(in, CEPH_SNAP_OP_SPLIT, true); + + // removing a new dn? + if (srcdn->is_auth()) + srcdn->get_dir()->try_remove_unlinked_dn(srcdn); +} + + + +// ------------ +// SLAVE + +class C_MDS_SlaveRenamePrep : public ServerLogContext { + CDentry *srcdn, *destdn, *straydn; +public: + C_MDS_SlaveRenamePrep(Server *s, MDRequestRef& m, CDentry *sr, CDentry *de, CDentry *st) : + ServerLogContext(s, m), srcdn(sr), destdn(de), straydn(st) {} + void finish(int r) override { + server->_logged_slave_rename(mdr, srcdn, destdn, straydn); + } +}; + +class C_MDS_SlaveRenameCommit : public ServerContext { + MDRequestRef mdr; + CDentry *srcdn, *destdn, *straydn; +public: + C_MDS_SlaveRenameCommit(Server *s, MDRequestRef& m, CDentry *sr, CDentry *de, CDentry *st) : + ServerContext(s), mdr(m), srcdn(sr), destdn(de), straydn(st) {} + void finish(int r) override { + server->_commit_slave_rename(mdr, r, srcdn, destdn, straydn); + } +}; + +class C_MDS_SlaveRenameSessionsFlushed : public ServerContext { + MDRequestRef mdr; +public: + C_MDS_SlaveRenameSessionsFlushed(Server *s, MDRequestRef& r) : + ServerContext(s), mdr(r) {} + void finish(int r) override { + server->_slave_rename_sessions_flushed(mdr); + } +}; + +void Server::handle_slave_rename_prep(MDRequestRef& mdr) +{ + dout(10) << "handle_slave_rename_prep " << *mdr + << " " << mdr->slave_request->srcdnpath + << " to " << mdr->slave_request->destdnpath + << dendl; + + if (mdr->slave_request->is_interrupted()) { + dout(10) << " slave request interrupted, sending noop reply" << dendl; + auto reply = MMDSSlaveRequest::create(mdr->reqid, mdr->attempt, MMDSSlaveRequest::OP_RENAMEPREPACK); + reply->mark_interrupted(); + mds->send_message_mds(reply, mdr->slave_to_mds); + mdr->reset_slave_request(); + return; + } + + // discover destdn + filepath destpath(mdr->slave_request->destdnpath); + dout(10) << " dest " << destpath << dendl; + vector<CDentry*> trace; + CF_MDS_MDRContextFactory cf(mdcache, mdr); + int r = mdcache->path_traverse(mdr, cf, destpath, &trace, NULL, MDS_TRAVERSE_DISCOVERXLOCK); + if (r > 0) return; + if (r == -ESTALE) { + mdcache->find_ino_peers(destpath.get_ino(), new C_MDS_RetryRequest(mdcache, mdr), + mdr->slave_to_mds); + return; + } + ceph_assert(r == 0); // we shouldn't get an error here! + + CDentry *destdn = trace.back(); + CDentry::linkage_t *destdnl = destdn->get_projected_linkage(); + dout(10) << " destdn " << *destdn << dendl; + mdr->pin(destdn); + + // discover srcdn + filepath srcpath(mdr->slave_request->srcdnpath); + dout(10) << " src " << srcpath << dendl; + CInode *srci = nullptr; + r = mdcache->path_traverse(mdr, cf, srcpath, &trace, &srci, MDS_TRAVERSE_DISCOVERXLOCK); + if (r > 0) return; + ceph_assert(r == 0); + + // srcpath must not point to a null dentry + ceph_assert(srci != nullptr); + + CDentry *srcdn = trace.back(); + CDentry::linkage_t *srcdnl = srcdn->get_projected_linkage(); + dout(10) << " srcdn " << *srcdn << dendl; + mdr->pin(srcdn); + mdr->pin(srci); + + // stray? + bool linkmerge = srcdnl->get_inode() == destdnl->get_inode(); + if (linkmerge) + ceph_assert(srcdnl->is_primary() && destdnl->is_remote()); + CDentry *straydn = mdr->straydn; + if (destdnl->is_primary() && !linkmerge) + ceph_assert(straydn); + + mdr->set_op_stamp(mdr->slave_request->op_stamp); + mdr->more()->srcdn_auth_mds = srcdn->authority().first; + + // set up commit waiter (early, to clean up any freezing etc we do) + if (!mdr->more()->slave_commit) + mdr->more()->slave_commit = new C_MDS_SlaveRenameCommit(this, mdr, srcdn, destdn, straydn); + + // am i srcdn auth? + if (srcdn->is_auth()) { + set<mds_rank_t> srcdnrep; + srcdn->list_replicas(srcdnrep); + + bool reply_witness = false; + if (srcdnl->is_primary() && !srcdnl->get_inode()->state_test(CInode::STATE_AMBIGUOUSAUTH)) { + // freeze? + // we need this to + // - avoid conflicting lock state changes + // - avoid concurrent updates to the inode + // (this could also be accomplished with the versionlock) + int allowance = 3; // 1 for the mdr auth_pin, 1 for the link lock, 1 for the snap lock + dout(10) << " freezing srci " << *srcdnl->get_inode() << " with allowance " << allowance << dendl; + bool frozen_inode = srcdnl->get_inode()->freeze_inode(allowance); + + // unfreeze auth pin after freezing the inode to avoid queueing waiters + if (srcdnl->get_inode()->is_frozen_auth_pin()) + mdr->unfreeze_auth_pin(); + + if (!frozen_inode) { + srcdnl->get_inode()->add_waiter(CInode::WAIT_FROZEN, new C_MDS_RetryRequest(mdcache, mdr)); + return; + } + + /* + * set ambiguous auth for srci + * NOTE: we don't worry about ambiguous cache expire as we do + * with subtree migrations because all slaves will pin + * srcdn->get_inode() for duration of this rename. + */ + mdr->set_ambiguous_auth(srcdnl->get_inode()); + + // just mark the source inode as ambiguous auth if more than two MDS are involved. + // the master will send another OP_RENAMEPREP slave request later. + if (mdr->slave_request->witnesses.size() > 1) { + dout(10) << " set srci ambiguous auth; providing srcdn replica list" << dendl; + reply_witness = true; + } + + // make sure bystanders have received all lock related messages + for (set<mds_rank_t>::iterator p = srcdnrep.begin(); p != srcdnrep.end(); ++p) { + if (*p == mdr->slave_to_mds || + (mds->is_cluster_degraded() && + !mds->mdsmap->is_clientreplay_or_active_or_stopping(*p))) + continue; + auto notify = MMDSSlaveRequest::create(mdr->reqid, mdr->attempt, MMDSSlaveRequest::OP_RENAMENOTIFY); + mds->send_message_mds(notify, *p); + mdr->more()->waiting_on_slave.insert(*p); + } + + // make sure clients have received all cap related messages + set<client_t> export_client_set; + mdcache->migrator->get_export_client_set(srcdnl->get_inode(), export_client_set); + + MDSGatherBuilder gather(g_ceph_context); + flush_client_sessions(export_client_set, gather); + if (gather.has_subs()) { + mdr->more()->waiting_on_slave.insert(MDS_RANK_NONE); + gather.set_finisher(new C_MDS_SlaveRenameSessionsFlushed(this, mdr)); + gather.activate(); + } + } + + // is witness list sufficient? + for (set<mds_rank_t>::iterator p = srcdnrep.begin(); p != srcdnrep.end(); ++p) { + if (*p == mdr->slave_to_mds || + mdr->slave_request->witnesses.count(*p)) continue; + dout(10) << " witness list insufficient; providing srcdn replica list" << dendl; + reply_witness = true; + break; + } + + if (reply_witness) { + ceph_assert(!srcdnrep.empty()); + auto reply = MMDSSlaveRequest::create(mdr->reqid, mdr->attempt, MMDSSlaveRequest::OP_RENAMEPREPACK); + reply->witnesses.swap(srcdnrep); + mds->send_message_mds(reply, mdr->slave_to_mds); + mdr->reset_slave_request(); + return; + } + dout(10) << " witness list sufficient: includes all srcdn replicas" << dendl; + if (!mdr->more()->waiting_on_slave.empty()) { + dout(10) << " still waiting for rename notify acks from " + << mdr->more()->waiting_on_slave << dendl; + return; + } + } else if (srcdnl->is_primary() && srcdn->authority() != destdn->authority()) { + // set ambiguous auth for srci on witnesses + mdr->set_ambiguous_auth(srcdnl->get_inode()); + } + + // encode everything we'd need to roll this back... basically, just the original state. + rename_rollback rollback; + + rollback.reqid = mdr->reqid; + + rollback.orig_src.dirfrag = srcdn->get_dir()->dirfrag(); + rollback.orig_src.dirfrag_old_mtime = srcdn->get_dir()->get_projected_fnode()->fragstat.mtime; + rollback.orig_src.dirfrag_old_rctime = srcdn->get_dir()->get_projected_fnode()->rstat.rctime; + rollback.orig_src.dname = srcdn->get_name(); + if (srcdnl->is_primary()) + rollback.orig_src.ino = srcdnl->get_inode()->ino(); + else { + ceph_assert(srcdnl->is_remote()); + rollback.orig_src.remote_ino = srcdnl->get_remote_ino(); + rollback.orig_src.remote_d_type = srcdnl->get_remote_d_type(); + } + + rollback.orig_dest.dirfrag = destdn->get_dir()->dirfrag(); + rollback.orig_dest.dirfrag_old_mtime = destdn->get_dir()->get_projected_fnode()->fragstat.mtime; + rollback.orig_dest.dirfrag_old_rctime = destdn->get_dir()->get_projected_fnode()->rstat.rctime; + rollback.orig_dest.dname = destdn->get_name(); + if (destdnl->is_primary()) + rollback.orig_dest.ino = destdnl->get_inode()->ino(); + else if (destdnl->is_remote()) { + rollback.orig_dest.remote_ino = destdnl->get_remote_ino(); + rollback.orig_dest.remote_d_type = destdnl->get_remote_d_type(); + } + + if (straydn) { + rollback.stray.dirfrag = straydn->get_dir()->dirfrag(); + rollback.stray.dirfrag_old_mtime = straydn->get_dir()->get_projected_fnode()->fragstat.mtime; + rollback.stray.dirfrag_old_rctime = straydn->get_dir()->get_projected_fnode()->rstat.rctime; + rollback.stray.dname = straydn->get_name(); + } + if (mdr->slave_request->desti_snapbl.length()) { + CInode *oldin = destdnl->get_inode(); + if (oldin->snaprealm) { + encode(true, rollback.desti_snapbl); + oldin->encode_snap_blob(rollback.desti_snapbl); + } else { + encode(false, rollback.desti_snapbl); + } + } + if (mdr->slave_request->srci_snapbl.length()) { + if (srci->snaprealm) { + encode(true, rollback.srci_snapbl); + srci->encode_snap_blob(rollback.srci_snapbl); + } else { + encode(false, rollback.srci_snapbl); + } + } + encode(rollback, mdr->more()->rollback_bl); + // FIXME: rollback snaprealm + dout(20) << " rollback is " << mdr->more()->rollback_bl.length() << " bytes" << dendl; + + // journal. + mdr->ls = mdlog->get_current_segment(); + ESlaveUpdate *le = new ESlaveUpdate(mdlog, "slave_rename_prep", mdr->reqid, mdr->slave_to_mds, + ESlaveUpdate::OP_PREPARE, ESlaveUpdate::RENAME); + mdlog->start_entry(le); + le->rollback = mdr->more()->rollback_bl; + + bufferlist blah; // inode import data... obviously not used if we're the slave + _rename_prepare(mdr, &le->commit, &blah, srcdn, destdn, straydn); + + if (le->commit.empty()) { + dout(10) << " empty metablob, skipping journal" << dendl; + mdlog->cancel_entry(le); + mdr->ls = NULL; + _logged_slave_rename(mdr, srcdn, destdn, straydn); + } else { + mdcache->add_uncommitted_slave(mdr->reqid, mdr->ls, mdr->slave_to_mds); + mdr->more()->slave_update_journaled = true; + submit_mdlog_entry(le, new C_MDS_SlaveRenamePrep(this, mdr, srcdn, destdn, straydn), + mdr, __func__); + mdlog->flush(); + } +} + +void Server::_logged_slave_rename(MDRequestRef& mdr, + CDentry *srcdn, CDentry *destdn, CDentry *straydn) +{ + dout(10) << "_logged_slave_rename " << *mdr << dendl; + + // prepare ack + MMDSSlaveRequest::ref reply; + if (!mdr->aborted) { + reply = MMDSSlaveRequest::create(mdr->reqid, mdr->attempt, MMDSSlaveRequest::OP_RENAMEPREPACK); + if (!mdr->more()->slave_update_journaled) + reply->mark_not_journaled(); + } + + CDentry::linkage_t *srcdnl = srcdn->get_linkage(); + //CDentry::linkage_t *straydnl = straydn ? straydn->get_linkage() : 0; + + // export srci? + if (srcdn->is_auth() && srcdnl->is_primary()) { + // set export bounds for CInode::encode_export() + if (reply) { + list<CDir*> bounds; + if (srcdnl->get_inode()->is_dir()) { + srcdnl->get_inode()->get_dirfrags(bounds); + for (list<CDir*>::iterator p = bounds.begin(); p != bounds.end(); ++p) + (*p)->state_set(CDir::STATE_EXPORTBOUND); + } + + map<client_t,entity_inst_t> exported_client_map; + map<client_t, client_metadata_t> exported_client_metadata_map; + bufferlist inodebl; + mdcache->migrator->encode_export_inode(srcdnl->get_inode(), inodebl, + exported_client_map, + exported_client_metadata_map); + + for (list<CDir*>::iterator p = bounds.begin(); p != bounds.end(); ++p) + (*p)->state_clear(CDir::STATE_EXPORTBOUND); + + encode(exported_client_map, reply->inode_export, mds->mdsmap->get_up_features()); + encode(exported_client_metadata_map, reply->inode_export); + reply->inode_export.claim_append(inodebl); + reply->inode_export_v = srcdnl->get_inode()->inode.version; + } + + // remove mdr auth pin + mdr->auth_unpin(srcdnl->get_inode()); + mdr->more()->is_inode_exporter = true; + + if (srcdnl->get_inode()->is_dirty()) + srcdnl->get_inode()->mark_clean(); + + dout(10) << " exported srci " << *srcdnl->get_inode() << dendl; + } + + // apply + _rename_apply(mdr, srcdn, destdn, straydn); + + CDentry::linkage_t *destdnl = destdn->get_linkage(); + + // bump popularity + mds->balancer->hit_dir(srcdn->get_dir(), META_POP_IWR); + if (destdnl->get_inode() && destdnl->get_inode()->is_auth()) + mds->balancer->hit_inode(destdnl->get_inode(), META_POP_IWR); + + // done. + mdr->reset_slave_request(); + mdr->straydn = 0; + + if (reply) { + mds->send_message_mds(reply, mdr->slave_to_mds); + } else { + ceph_assert(mdr->aborted); + dout(10) << " abort flag set, finishing" << dendl; + mdcache->request_finish(mdr); + } +} + +void Server::_commit_slave_rename(MDRequestRef& mdr, int r, + CDentry *srcdn, CDentry *destdn, CDentry *straydn) +{ + dout(10) << "_commit_slave_rename " << *mdr << " r=" << r << dendl; + + CInode *in = destdn->get_linkage()->get_inode(); + + inodeno_t migrated_stray; + if (srcdn->is_auth() && srcdn->get_dir()->inode->is_stray()) + migrated_stray = in->ino(); + + MDSContext::vec finished; + if (r == 0) { + // unfreeze+singleauth inode + // hmm, do i really need to delay this? + if (mdr->more()->is_inode_exporter) { + // drop our pins + // we exported, clear out any xlocks that we moved to another MDS + + for (auto i = mdr->locks.lower_bound(&in->versionlock); + i != mdr->locks.end(); ) { + SimpleLock *lock = i->lock; + if (lock->get_parent() != in) + break; + // we only care about xlocks on the exported inode + if (i->is_xlock() && !lock->is_locallock()) + mds->locker->xlock_export(i++, mdr.get()); + else + ++i; + } + + map<client_t,Capability::Import> peer_imported; + auto bp = mdr->more()->inode_import.cbegin(); + decode(peer_imported, bp); + + dout(10) << " finishing inode export on " << *in << dendl; + mdcache->migrator->finish_export_inode(in, mdr->slave_to_mds, peer_imported, finished); + mds->queue_waiters(finished); // this includes SINGLEAUTH waiters. + + // unfreeze + ceph_assert(in->is_frozen_inode()); + in->unfreeze_inode(finished); + } + + // singleauth + if (mdr->more()->is_ambiguous_auth) { + mdr->more()->rename_inode->clear_ambiguous_auth(finished); + mdr->more()->is_ambiguous_auth = false; + } + + if (straydn && mdr->more()->slave_update_journaled) { + CInode *strayin = straydn->get_projected_linkage()->get_inode(); + if (strayin && !strayin->snaprealm) + mdcache->clear_dirty_bits_for_stray(strayin); + } + + mds->queue_waiters(finished); + mdr->cleanup(); + + if (mdr->more()->slave_update_journaled) { + // write a commit to the journal + ESlaveUpdate *le = new ESlaveUpdate(mdlog, "slave_rename_commit", mdr->reqid, + mdr->slave_to_mds, ESlaveUpdate::OP_COMMIT, + ESlaveUpdate::RENAME); + mdlog->start_entry(le); + submit_mdlog_entry(le, new C_MDS_CommittedSlave(this, mdr), mdr, __func__); + mdlog->flush(); + } else { + _committed_slave(mdr); + } + } else { + + // abort + // rollback_bl may be empty if we froze the inode but had to provide an expanded + // witness list from the master, and they failed before we tried prep again. + if (mdr->more()->rollback_bl.length()) { + if (mdr->more()->is_inode_exporter) { + dout(10) << " reversing inode export of " << *in << dendl; + in->abort_export(); + } + if (mdcache->is_ambiguous_slave_update(mdr->reqid, mdr->slave_to_mds)) { + mdcache->remove_ambiguous_slave_update(mdr->reqid, mdr->slave_to_mds); + // rollback but preserve the slave request + do_rename_rollback(mdr->more()->rollback_bl, mdr->slave_to_mds, mdr, false); + mdr->more()->rollback_bl.clear(); + } else + do_rename_rollback(mdr->more()->rollback_bl, mdr->slave_to_mds, mdr, true); + } else { + dout(10) << " rollback_bl empty, not rollback back rename (master failed after getting extra witnesses?)" << dendl; + // singleauth + if (mdr->more()->is_ambiguous_auth) { + if (srcdn->is_auth()) + mdr->more()->rename_inode->unfreeze_inode(finished); + + mdr->more()->rename_inode->clear_ambiguous_auth(finished); + mdr->more()->is_ambiguous_auth = false; + } + mds->queue_waiters(finished); + mdcache->request_finish(mdr); + } + } + + if (migrated_stray && mds->is_stopping()) + mdcache->shutdown_export_stray_finish(migrated_stray); +} + +void _rollback_repair_dir(MutationRef& mut, CDir *dir, rename_rollback::drec &r, utime_t ctime, + bool isdir, int linkunlink, nest_info_t &rstat) +{ + fnode_t *pf; + pf = dir->project_fnode(); + mut->add_projected_fnode(dir); + pf->version = dir->pre_dirty(); + + if (isdir) { + pf->fragstat.nsubdirs += linkunlink; + } else { + pf->fragstat.nfiles += linkunlink; + } + if (r.ino) { + pf->rstat.rbytes += linkunlink * rstat.rbytes; + pf->rstat.rfiles += linkunlink * rstat.rfiles; + pf->rstat.rsubdirs += linkunlink * rstat.rsubdirs; + pf->rstat.rsnaps += linkunlink * rstat.rsnaps; + } + if (pf->fragstat.mtime == ctime) { + pf->fragstat.mtime = r.dirfrag_old_mtime; + if (pf->rstat.rctime == ctime) + pf->rstat.rctime = r.dirfrag_old_rctime; + } + mut->add_updated_lock(&dir->get_inode()->filelock); + mut->add_updated_lock(&dir->get_inode()->nestlock); +} + +struct C_MDS_LoggedRenameRollback : public ServerLogContext { + MutationRef mut; + CDentry *srcdn; + version_t srcdnpv; + CDentry *destdn; + CDentry *straydn; + map<client_t,MClientSnap::ref> splits[2]; + bool finish_mdr; + C_MDS_LoggedRenameRollback(Server *s, MutationRef& m, MDRequestRef& r, + CDentry *sd, version_t pv, CDentry *dd, CDentry *st, + map<client_t,MClientSnap::ref> _splits[2], bool f) : + ServerLogContext(s, r), mut(m), srcdn(sd), srcdnpv(pv), destdn(dd), + straydn(st), finish_mdr(f) { + splits[0].swap(_splits[0]); + splits[1].swap(_splits[1]); + } + void finish(int r) override { + server->_rename_rollback_finish(mut, mdr, srcdn, srcdnpv, + destdn, straydn, splits, finish_mdr); + } +}; + +void Server::do_rename_rollback(bufferlist &rbl, mds_rank_t master, MDRequestRef& mdr, + bool finish_mdr) +{ + rename_rollback rollback; + auto p = rbl.cbegin(); + decode(rollback, p); + + dout(10) << "do_rename_rollback on " << rollback.reqid << dendl; + // need to finish this update before sending resolve to claim the subtree + mdcache->add_rollback(rollback.reqid, master); + + MutationRef mut(new MutationImpl(nullptr, utime_t(), rollback.reqid)); + mut->ls = mds->mdlog->get_current_segment(); + + CDentry *srcdn = NULL; + CDir *srcdir = mdcache->get_dirfrag(rollback.orig_src.dirfrag); + if (!srcdir) + srcdir = mdcache->get_dirfrag(rollback.orig_src.dirfrag.ino, rollback.orig_src.dname); + if (srcdir) { + dout(10) << " srcdir " << *srcdir << dendl; + srcdn = srcdir->lookup(rollback.orig_src.dname); + if (srcdn) { + dout(10) << " srcdn " << *srcdn << dendl; + ceph_assert(srcdn->get_linkage()->is_null()); + } else + dout(10) << " srcdn not found" << dendl; + } else + dout(10) << " srcdir not found" << dendl; + + CDentry *destdn = NULL; + CDir *destdir = mdcache->get_dirfrag(rollback.orig_dest.dirfrag); + if (!destdir) + destdir = mdcache->get_dirfrag(rollback.orig_dest.dirfrag.ino, rollback.orig_dest.dname); + if (destdir) { + dout(10) << " destdir " << *destdir << dendl; + destdn = destdir->lookup(rollback.orig_dest.dname); + if (destdn) + dout(10) << " destdn " << *destdn << dendl; + else + dout(10) << " destdn not found" << dendl; + } else + dout(10) << " destdir not found" << dendl; + + CInode *in = NULL; + if (rollback.orig_src.ino) { + in = mdcache->get_inode(rollback.orig_src.ino); + if (in && in->is_dir()) + ceph_assert(srcdn && destdn); + } else + in = mdcache->get_inode(rollback.orig_src.remote_ino); + + CDir *straydir = NULL; + CDentry *straydn = NULL; + if (rollback.stray.dirfrag.ino) { + straydir = mdcache->get_dirfrag(rollback.stray.dirfrag); + if (straydir) { + dout(10) << "straydir " << *straydir << dendl; + straydn = straydir->lookup(rollback.stray.dname); + if (straydn) { + dout(10) << " straydn " << *straydn << dendl; + ceph_assert(straydn->get_linkage()->is_primary()); + } else + dout(10) << " straydn not found" << dendl; + } else + dout(10) << "straydir not found" << dendl; + } + + CInode *target = NULL; + if (rollback.orig_dest.ino) { + target = mdcache->get_inode(rollback.orig_dest.ino); + if (target) + ceph_assert(destdn && straydn); + } else if (rollback.orig_dest.remote_ino) + target = mdcache->get_inode(rollback.orig_dest.remote_ino); + + // can't use is_auth() in the resolve stage + mds_rank_t whoami = mds->get_nodeid(); + // slave + ceph_assert(!destdn || destdn->authority().first != whoami); + ceph_assert(!straydn || straydn->authority().first != whoami); + + bool force_journal_src = false; + bool force_journal_dest = false; + if (in && in->is_dir() && srcdn->authority().first != whoami) + force_journal_src = _need_force_journal(in, false); + if (in && target && target->is_dir()) + force_journal_dest = _need_force_journal(in, true); + + version_t srcdnpv = 0; + // repair src + if (srcdn) { + if (srcdn->authority().first == whoami) + srcdnpv = srcdn->pre_dirty(); + if (rollback.orig_src.ino) { + ceph_assert(in); + srcdn->push_projected_linkage(in); + } else + srcdn->push_projected_linkage(rollback.orig_src.remote_ino, + rollback.orig_src.remote_d_type); + } + + map<client_t,MClientSnap::ref> splits[2]; + + CInode::mempool_inode *pip = nullptr; + if (in) { + bool projected; + if (in->get_projected_parent_dn()->authority().first == whoami) { + auto &pi = in->project_inode(); + pip = &pi.inode; + mut->add_projected_inode(in); + pip->version = in->pre_dirty(); + projected = true; + } else { + pip = in->get_projected_inode(); + projected = false; + } + if (pip->ctime == rollback.ctime) + pip->ctime = rollback.orig_src.old_ctime; + + if (rollback.srci_snapbl.length() && in->snaprealm) { + bool hadrealm; + auto p = rollback.srci_snapbl.cbegin(); + decode(hadrealm, p); + if (hadrealm) { + if (projected && !mds->is_resolve()) { + sr_t *new_srnode = new sr_t(); + decode(*new_srnode, p); + in->project_snaprealm(new_srnode); + } else + decode(in->snaprealm->srnode, p); + } else { + SnapRealm *realm; + if (rollback.orig_src.ino) { + ceph_assert(srcdir); + realm = srcdir->get_inode()->find_snaprealm(); + } else { + realm = in->snaprealm->parent; + } + if (!mds->is_resolve()) + mdcache->prepare_realm_merge(in->snaprealm, realm, splits[0]); + if (projected) + in->project_snaprealm(NULL); + else + in->snaprealm->merge_to(realm); + } + } + } + + if (srcdn && srcdn->authority().first == whoami) { + nest_info_t blah; + _rollback_repair_dir(mut, srcdir, rollback.orig_src, rollback.ctime, + in ? in->is_dir() : false, 1, pip ? pip->accounted_rstat : blah); + } + + // repair dest + if (destdn) { + if (rollback.orig_dest.ino && target) { + destdn->push_projected_linkage(target); + } else if (rollback.orig_dest.remote_ino) { + destdn->push_projected_linkage(rollback.orig_dest.remote_ino, + rollback.orig_dest.remote_d_type); + } else { + // the dentry will be trimmed soon, it's ok to have wrong linkage + if (rollback.orig_dest.ino) + ceph_assert(mds->is_resolve()); + destdn->push_projected_linkage(); + } + } + + if (straydn) + straydn->push_projected_linkage(); + + if (target) { + bool projected; + CInode::mempool_inode *ti = nullptr; + if (target->get_projected_parent_dn()->authority().first == whoami) { + auto &pi = target->project_inode(); + ti = &pi.inode; + mut->add_projected_inode(target); + ti->version = target->pre_dirty(); + projected = true; + } else { + ti = target->get_projected_inode(); + projected = false; + } + if (ti->ctime == rollback.ctime) + ti->ctime = rollback.orig_dest.old_ctime; + if (MDS_INO_IS_STRAY(rollback.orig_src.dirfrag.ino)) { + if (MDS_INO_IS_STRAY(rollback.orig_dest.dirfrag.ino)) + ceph_assert(!rollback.orig_dest.ino && !rollback.orig_dest.remote_ino); + else + ceph_assert(rollback.orig_dest.remote_ino && + rollback.orig_dest.remote_ino == rollback.orig_src.ino); + } else + ti->nlink++; + + if (rollback.desti_snapbl.length() && target->snaprealm) { + bool hadrealm; + auto p = rollback.desti_snapbl.cbegin(); + decode(hadrealm, p); + if (hadrealm) { + if (projected && !mds->is_resolve()) { + sr_t *new_srnode = new sr_t(); + decode(*new_srnode, p); + target->project_snaprealm(new_srnode); + } else + decode(target->snaprealm->srnode, p); + } else { + SnapRealm *realm; + if (rollback.orig_dest.ino) { + ceph_assert(destdir); + realm = destdir->get_inode()->find_snaprealm(); + } else { + realm = target->snaprealm->parent; + } + if (!mds->is_resolve()) + mdcache->prepare_realm_merge(target->snaprealm, realm, splits[1]); + if (projected) + target->project_snaprealm(NULL); + else + target->snaprealm->merge_to(realm); + } + } + } + + if (srcdn) + dout(0) << " srcdn back to " << *srcdn << dendl; + if (in) + dout(0) << " srci back to " << *in << dendl; + if (destdn) + dout(0) << " destdn back to " << *destdn << dendl; + if (target) + dout(0) << " desti back to " << *target << dendl; + + // journal it + ESlaveUpdate *le = new ESlaveUpdate(mdlog, "slave_rename_rollback", rollback.reqid, master, + ESlaveUpdate::OP_ROLLBACK, ESlaveUpdate::RENAME); + mdlog->start_entry(le); + + if (srcdn && (srcdn->authority().first == whoami || force_journal_src)) { + le->commit.add_dir_context(srcdir); + if (rollback.orig_src.ino) + le->commit.add_primary_dentry(srcdn, 0, true); + else + le->commit.add_remote_dentry(srcdn, true); + } + + if (!rollback.orig_src.ino && // remote linkage + in && in->authority().first == whoami) { + le->commit.add_dir_context(in->get_projected_parent_dir()); + le->commit.add_primary_dentry(in->get_projected_parent_dn(), in, true); + } + + if (force_journal_dest) { + ceph_assert(rollback.orig_dest.ino); + le->commit.add_dir_context(destdir); + le->commit.add_primary_dentry(destdn, 0, true); + } + + // slave: no need to journal straydn + + if (target && target != in && target->authority().first == whoami) { + ceph_assert(rollback.orig_dest.remote_ino); + le->commit.add_dir_context(target->get_projected_parent_dir()); + le->commit.add_primary_dentry(target->get_projected_parent_dn(), target, true); + } + + if (in && in->is_dir() && (srcdn->authority().first == whoami || force_journal_src)) { + dout(10) << " noting renamed dir ino " << in->ino() << " in metablob" << dendl; + le->commit.renamed_dirino = in->ino(); + if (srcdn->authority().first == whoami) { + list<CDir*> ls; + in->get_dirfrags(ls); + for (list<CDir*>::iterator p = ls.begin(); p != ls.end(); ++p) { + CDir *dir = *p; + if (!dir->is_auth()) + le->commit.renamed_dir_frags.push_back(dir->get_frag()); + } + dout(10) << " noting renamed dir open frags " << le->commit.renamed_dir_frags << dendl; + } + } else if (force_journal_dest) { + dout(10) << " noting rename target ino " << target->ino() << " in metablob" << dendl; + le->commit.renamed_dirino = target->ino(); + } + + if (target && target->is_dir()) { + ceph_assert(destdn); + mdcache->project_subtree_rename(target, straydir, destdir); + } + + if (in && in->is_dir()) { + ceph_assert(srcdn); + mdcache->project_subtree_rename(in, destdir, srcdir); + } + + if (mdr && !mdr->more()->slave_update_journaled) { + ceph_assert(le->commit.empty()); + mdlog->cancel_entry(le); + mut->ls = NULL; + _rename_rollback_finish(mut, mdr, srcdn, srcdnpv, destdn, straydn, splits, finish_mdr); + } else { + ceph_assert(!le->commit.empty()); + if (mdr) + mdr->more()->slave_update_journaled = false; + MDSLogContextBase *fin = new C_MDS_LoggedRenameRollback(this, mut, mdr, + srcdn, srcdnpv, destdn, straydn, + splits, finish_mdr); + submit_mdlog_entry(le, fin, mdr, __func__); + mdlog->flush(); + } +} + +void Server::_rename_rollback_finish(MutationRef& mut, MDRequestRef& mdr, CDentry *srcdn, + version_t srcdnpv, CDentry *destdn, CDentry *straydn, + map<client_t,MClientSnap::ref> splits[2], bool finish_mdr) +{ + dout(10) << "_rename_rollback_finish " << mut->reqid << dendl; + + if (straydn) { + straydn->get_dir()->unlink_inode(straydn); + straydn->pop_projected_linkage(); + } + if (destdn) { + destdn->get_dir()->unlink_inode(destdn); + destdn->pop_projected_linkage(); + } + if (srcdn) { + srcdn->pop_projected_linkage(); + if (srcdn->authority().first == mds->get_nodeid()) { + srcdn->mark_dirty(srcdnpv, mut->ls); + if (srcdn->get_linkage()->is_primary()) + srcdn->get_linkage()->get_inode()->state_set(CInode::STATE_AUTH); + } + } + + mut->apply(); + + if (srcdn && srcdn->get_linkage()->is_primary()) { + CInode *in = srcdn->get_linkage()->get_inode(); + if (in && in->is_dir()) { + ceph_assert(destdn); + mdcache->adjust_subtree_after_rename(in, destdn->get_dir(), true); + } + } + + if (destdn) { + CInode *oldin = destdn->get_linkage()->get_inode(); + // update subtree map? + if (oldin && oldin->is_dir()) { + ceph_assert(straydn); + mdcache->adjust_subtree_after_rename(oldin, straydn->get_dir(), true); + } + } + + if (mds->is_resolve()) { + CDir *root = NULL; + if (straydn) + root = mdcache->get_subtree_root(straydn->get_dir()); + else if (destdn) + root = mdcache->get_subtree_root(destdn->get_dir()); + if (root) + mdcache->try_trim_non_auth_subtree(root); + } else { + mdcache->send_snaps(splits[1]); + mdcache->send_snaps(splits[0]); + } + + if (mdr) { + MDSContext::vec finished; + if (mdr->more()->is_ambiguous_auth) { + if (srcdn->is_auth()) + mdr->more()->rename_inode->unfreeze_inode(finished); + + mdr->more()->rename_inode->clear_ambiguous_auth(finished); + mdr->more()->is_ambiguous_auth = false; + } + mds->queue_waiters(finished); + if (finish_mdr || mdr->aborted) + mdcache->request_finish(mdr); + else + mdr->more()->slave_rolling_back = false; + } + + mdcache->finish_rollback(mut->reqid, mdr); + + mut->cleanup(); +} + +void Server::handle_slave_rename_prep_ack(MDRequestRef& mdr, const MMDSSlaveRequest::const_ref &ack) +{ + dout(10) << "handle_slave_rename_prep_ack " << *mdr + << " witnessed by " << ack->get_source() + << " " << *ack << dendl; + mds_rank_t from = mds_rank_t(ack->get_source().num()); + + // note slave + mdr->more()->slaves.insert(from); + if (mdr->more()->srcdn_auth_mds == from && + mdr->more()->is_remote_frozen_authpin && + !mdr->more()->is_ambiguous_auth) { + mdr->set_ambiguous_auth(mdr->more()->rename_inode); + } + + // witnessed? or add extra witnesses? + ceph_assert(mdr->more()->witnessed.count(from) == 0); + if (ack->is_interrupted()) { + dout(10) << " slave request interrupted, noop" << dendl; + } else if (ack->witnesses.empty()) { + mdr->more()->witnessed.insert(from); + if (!ack->is_not_journaled()) + mdr->more()->has_journaled_slaves = true; + } else { + dout(10) << " extra witnesses (srcdn replicas) are " << ack->witnesses << dendl; + mdr->more()->extra_witnesses = ack->witnesses; + mdr->more()->extra_witnesses.erase(mds->get_nodeid()); // not me! + } + + // srci import? + if (ack->inode_export.length()) { + dout(10) << " got srci import" << dendl; + mdr->more()->inode_import.share(ack->inode_export); + mdr->more()->inode_import_v = ack->inode_export_v; + } + + // remove from waiting list + ceph_assert(mdr->more()->waiting_on_slave.count(from)); + mdr->more()->waiting_on_slave.erase(from); + + if (mdr->more()->waiting_on_slave.empty()) + dispatch_client_request(mdr); // go again! + else + dout(10) << "still waiting on slaves " << mdr->more()->waiting_on_slave << dendl; +} + +void Server::handle_slave_rename_notify_ack(MDRequestRef& mdr, const MMDSSlaveRequest::const_ref &ack) +{ + dout(10) << "handle_slave_rename_notify_ack " << *mdr << " from mds." + << ack->get_source() << dendl; + ceph_assert(mdr->is_slave()); + mds_rank_t from = mds_rank_t(ack->get_source().num()); + + if (mdr->more()->waiting_on_slave.count(from)) { + mdr->more()->waiting_on_slave.erase(from); + + if (mdr->more()->waiting_on_slave.empty()) { + if (mdr->slave_request) + dispatch_slave_request(mdr); + } else + dout(10) << " still waiting for rename notify acks from " + << mdr->more()->waiting_on_slave << dendl; + } +} + +void Server::_slave_rename_sessions_flushed(MDRequestRef& mdr) +{ + dout(10) << "_slave_rename_sessions_flushed " << *mdr << dendl; + + if (mdr->more()->waiting_on_slave.count(MDS_RANK_NONE)) { + mdr->more()->waiting_on_slave.erase(MDS_RANK_NONE); + + if (mdr->more()->waiting_on_slave.empty()) { + if (mdr->slave_request) + dispatch_slave_request(mdr); + } else + dout(10) << " still waiting for rename notify acks from " + << mdr->more()->waiting_on_slave << dendl; + } +} + +// snaps +/* This function takes responsibility for the passed mdr*/ +void Server::handle_client_lssnap(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + + // traverse to path + CInode *diri = mdcache->get_inode(req->get_filepath().get_ino()); + if (!diri || diri->state_test(CInode::STATE_PURGING)) { + respond_to_request(mdr, -ESTALE); + return; + } + if (!diri->is_auth()) { + mdcache->request_forward(mdr, diri->authority().first); + return; + } + if (!diri->is_dir()) { + respond_to_request(mdr, -ENOTDIR); + return; + } + dout(10) << "lssnap on " << *diri << dendl; + + // lock snap + MutationImpl::LockOpVec lov; + mds->locker->include_snap_rdlocks(diri, lov); + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + if (!check_access(mdr, diri, MAY_READ)) + return; + + SnapRealm *realm = diri->find_snaprealm(); + map<snapid_t,const SnapInfo*> infomap; + realm->get_snap_info(infomap, diri->get_oldest_snap()); + + unsigned max_entries = req->head.args.readdir.max_entries; + if (!max_entries) + max_entries = infomap.size(); + int max_bytes = req->head.args.readdir.max_bytes; + if (!max_bytes) + // make sure at least one item can be encoded + max_bytes = (512 << 10) + g_conf()->mds_max_xattr_pairs_size; + + __u64 last_snapid = 0; + string offset_str = req->get_path2(); + if (!offset_str.empty()) + last_snapid = realm->resolve_snapname(offset_str, diri->ino()); + + //Empty DirStat + bufferlist dirbl; + static DirStat empty; + CDir::encode_dirstat(dirbl, mdr->session->info, empty); + + max_bytes -= dirbl.length() - sizeof(__u32) + sizeof(__u8) * 2; + + __u32 num = 0; + bufferlist dnbl; + auto p = infomap.upper_bound(last_snapid); + for (; p != infomap.end() && num < max_entries; ++p) { + dout(10) << p->first << " -> " << *p->second << dendl; + + // actual + string snap_name; + if (p->second->ino == diri->ino()) + snap_name = p->second->name; + else + snap_name = p->second->get_long_name(); + + unsigned start_len = dnbl.length(); + if (int(start_len + snap_name.length() + sizeof(__u32) + sizeof(LeaseStat)) > max_bytes) + break; + + encode(snap_name, dnbl); + //infinite lease + LeaseStat e(-1, -1, 0); + mds->locker->encode_lease(dnbl, mdr->session->info, e); + dout(20) << "encode_infinite_lease" << dendl; + + int r = diri->encode_inodestat(dnbl, mdr->session, realm, p->first, max_bytes - (int)dnbl.length()); + if (r < 0) { + bufferlist keep; + keep.substr_of(dnbl, 0, start_len); + dnbl.swap(keep); + break; + } + ++num; + } + + encode(num, dirbl); + __u16 flags = 0; + if (p == infomap.end()) { + flags = CEPH_READDIR_FRAG_END; + if (last_snapid == 0) + flags |= CEPH_READDIR_FRAG_COMPLETE; + } + encode(flags, dirbl); + dirbl.claim_append(dnbl); + + mdr->reply_extra_bl = dirbl; + mdr->tracei = diri; + respond_to_request(mdr, 0); +} + + +// MKSNAP + +struct C_MDS_mksnap_finish : public ServerLogContext { + CInode *diri; + SnapInfo info; + C_MDS_mksnap_finish(Server *s, MDRequestRef& r, CInode *di, SnapInfo &i) : + ServerLogContext(s, r), diri(di), info(i) {} + void finish(int r) override { + server->_mksnap_finish(mdr, diri, info); + } +}; + +/* This function takes responsibility for the passed mdr*/ +void Server::handle_client_mksnap(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + // make sure we have as new a map as the client + if (req->get_mdsmap_epoch() > mds->mdsmap->get_epoch()) { + mds->wait_for_mdsmap(req->get_mdsmap_epoch(), new C_MDS_RetryRequest(mdcache, mdr)); + return; + } + if (!mds->mdsmap->allows_snaps()) { + // you can't make snapshots until you set an option right now + respond_to_request(mdr, -EPERM); + return; + } + + CInode *diri = mdcache->get_inode(req->get_filepath().get_ino()); + if (!diri || diri->state_test(CInode::STATE_PURGING)) { + respond_to_request(mdr, -ESTALE); + return; + } + + if (!diri->is_auth()) { // fw to auth? + mdcache->request_forward(mdr, diri->authority().first); + return; + } + + // dir only + if (!diri->is_dir()) { + respond_to_request(mdr, -ENOTDIR); + return; + } + if (diri->is_system() && !diri->is_root()) { + // no snaps in system dirs (root is ok) + respond_to_request(mdr, -EPERM); + return; + } + + std::string_view snapname = req->get_filepath().last_dentry(); + + if (mdr->client_request->get_caller_uid() < g_conf()->mds_snap_min_uid || mdr->client_request->get_caller_uid() > g_conf()->mds_snap_max_uid) { + dout(20) << "mksnap " << snapname << " on " << *diri << " denied to uid " << mdr->client_request->get_caller_uid() << dendl; + respond_to_request(mdr, -EPERM); + return; + } + + dout(10) << "mksnap " << snapname << " on " << *diri << dendl; + + // lock snap + MutationImpl::LockOpVec lov; + + mds->locker->include_snap_rdlocks(diri, lov); + lov.erase_rdlock(&diri->snaplock); + lov.add_xlock(&diri->snaplock); + + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + if (!check_access(mdr, diri, MAY_WRITE|MAY_SNAPSHOT)) + return; + + if (inodeno_t subvol_ino = diri->find_snaprealm()->get_subvolume_ino(); + (subvol_ino && subvol_ino != diri->ino())) { + respond_to_request(mdr, -EPERM); + return; + } + + // check if we can create any more snapshots + // we don't allow any more if we are already at or beyond the limit + if (diri->snaprealm && + diri->snaprealm->get_snaps().size() >= max_snaps_per_dir) { + respond_to_request(mdr, -EMLINK); + return; + } + + // make sure name is unique + if (diri->snaprealm && + diri->snaprealm->exists(snapname)) { + respond_to_request(mdr, -EEXIST); + return; + } + if (snapname.length() == 0 || + snapname[0] == '_') { + respond_to_request(mdr, -EINVAL); + return; + } + + // allocate a snapid + if (!mdr->more()->stid) { + // prepare an stid + mds->snapclient->prepare_create(diri->ino(), snapname, + mdr->get_mds_stamp(), + &mdr->more()->stid, &mdr->more()->snapidbl, + new C_MDS_RetryRequest(mdcache, mdr)); + return; + } + + version_t stid = mdr->more()->stid; + snapid_t snapid; + auto p = mdr->more()->snapidbl.cbegin(); + decode(snapid, p); + dout(10) << " stid " << stid << " snapid " << snapid << dendl; + + ceph_assert(mds->snapclient->get_cached_version() >= stid); + + // journal + SnapInfo info; + info.ino = diri->ino(); + info.snapid = snapid; + info.name = snapname; + info.stamp = mdr->get_op_stamp(); + + auto &pi = diri->project_inode(false, true); + pi.inode.ctime = info.stamp; + if (info.stamp > pi.inode.rstat.rctime) + pi.inode.rstat.rctime = info.stamp; + pi.inode.rstat.rsnaps++; + pi.inode.version = diri->pre_dirty(); + + // project the snaprealm + auto &newsnap = *pi.snapnode; + newsnap.created = snapid; + auto em = newsnap.snaps.emplace(std::piecewise_construct, std::forward_as_tuple(snapid), std::forward_as_tuple(info)); + if (!em.second) + em.first->second = info; + newsnap.seq = snapid; + newsnap.last_created = snapid; + + // journal the inode changes + mdr->ls = mdlog->get_current_segment(); + EUpdate *le = new EUpdate(mdlog, "mksnap"); + mdlog->start_entry(le); + + le->metablob.add_client_req(req->get_reqid(), req->get_oldest_client_tid()); + le->metablob.add_table_transaction(TABLE_SNAP, stid); + mdcache->predirty_journal_parents(mdr, &le->metablob, diri, 0, PREDIRTY_PRIMARY, false); + mdcache->journal_dirty_inode(mdr.get(), &le->metablob, diri); + + // journal the snaprealm changes + submit_mdlog_entry(le, new C_MDS_mksnap_finish(this, mdr, diri, info), + mdr, __func__); + mdlog->flush(); +} + +void Server::_mksnap_finish(MDRequestRef& mdr, CInode *diri, SnapInfo &info) +{ + dout(10) << "_mksnap_finish " << *mdr << " " << info << dendl; + + int op = (diri->snaprealm? CEPH_SNAP_OP_CREATE : CEPH_SNAP_OP_SPLIT); + + diri->pop_and_dirty_projected_inode(mdr->ls); + mdr->apply(); + + mds->snapclient->commit(mdr->more()->stid, mdr->ls); + + // create snap + dout(10) << "snaprealm now " << *diri->snaprealm << dendl; + + // notify other mds + mdcache->send_snap_update(diri, mdr->more()->stid, op); + + mdcache->do_realm_invalidate_and_update_notify(diri, op); + + // yay + mdr->in[0] = diri; + mdr->snapid = info.snapid; + mdr->tracei = diri; + respond_to_request(mdr, 0); +} + + +// RMSNAP + +struct C_MDS_rmsnap_finish : public ServerLogContext { + CInode *diri; + snapid_t snapid; + C_MDS_rmsnap_finish(Server *s, MDRequestRef& r, CInode *di, snapid_t sn) : + ServerLogContext(s, r), diri(di), snapid(sn) {} + void finish(int r) override { + server->_rmsnap_finish(mdr, diri, snapid); + } +}; + +/* This function takes responsibility for the passed mdr*/ +void Server::handle_client_rmsnap(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + + CInode *diri = mdcache->get_inode(req->get_filepath().get_ino()); + if (!diri || diri->state_test(CInode::STATE_PURGING)) { + respond_to_request(mdr, -ESTALE); + return; + } + if (!diri->is_auth()) { // fw to auth? + mdcache->request_forward(mdr, diri->authority().first); + return; + } + if (!diri->is_dir()) { + respond_to_request(mdr, -ENOTDIR); + return; + } + + std::string_view snapname = req->get_filepath().last_dentry(); + + if (mdr->client_request->get_caller_uid() < g_conf()->mds_snap_min_uid || mdr->client_request->get_caller_uid() > g_conf()->mds_snap_max_uid) { + dout(20) << "rmsnap " << snapname << " on " << *diri << " denied to uid " << mdr->client_request->get_caller_uid() << dendl; + respond_to_request(mdr, -EPERM); + return; + } + + dout(10) << "rmsnap " << snapname << " on " << *diri << dendl; + + // does snap exist? + if (snapname.length() == 0 || snapname[0] == '_') { + respond_to_request(mdr, -EINVAL); // can't prune a parent snap, currently. + return; + } + if (!diri->snaprealm || !diri->snaprealm->exists(snapname)) { + respond_to_request(mdr, -ENOENT); + return; + } + snapid_t snapid = diri->snaprealm->resolve_snapname(snapname, diri->ino()); + dout(10) << " snapname " << snapname << " is " << snapid << dendl; + + MutationImpl::LockOpVec lov; + mds->locker->include_snap_rdlocks(diri, lov); + lov.erase_rdlock(&diri->snaplock); + lov.add_xlock(&diri->snaplock); + + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + if (!check_access(mdr, diri, MAY_WRITE|MAY_SNAPSHOT)) + return; + + // prepare + if (!mdr->more()->stid) { + mds->snapclient->prepare_destroy(diri->ino(), snapid, + &mdr->more()->stid, &mdr->more()->snapidbl, + new C_MDS_RetryRequest(mdcache, mdr)); + return; + } + version_t stid = mdr->more()->stid; + auto p = mdr->more()->snapidbl.cbegin(); + snapid_t seq; + decode(seq, p); + dout(10) << " stid is " << stid << ", seq is " << seq << dendl; + + ceph_assert(mds->snapclient->get_cached_version() >= stid); + + // journal + auto &pi = diri->project_inode(false, true); + pi.inode.version = diri->pre_dirty(); + pi.inode.ctime = mdr->get_op_stamp(); + if (mdr->get_op_stamp() > pi.inode.rstat.rctime) + pi.inode.rstat.rctime = mdr->get_op_stamp(); + pi.inode.rstat.rsnaps--; + + mdr->ls = mdlog->get_current_segment(); + EUpdate *le = new EUpdate(mdlog, "rmsnap"); + mdlog->start_entry(le); + + // project the snaprealm + auto &newnode = *pi.snapnode; + newnode.snaps.erase(snapid); + newnode.seq = seq; + newnode.last_destroyed = seq; + + le->metablob.add_client_req(req->get_reqid(), req->get_oldest_client_tid()); + le->metablob.add_table_transaction(TABLE_SNAP, stid); + mdcache->predirty_journal_parents(mdr, &le->metablob, diri, 0, PREDIRTY_PRIMARY, false); + mdcache->journal_dirty_inode(mdr.get(), &le->metablob, diri); + + submit_mdlog_entry(le, new C_MDS_rmsnap_finish(this, mdr, diri, snapid), + mdr, __func__); + mdlog->flush(); +} + +void Server::_rmsnap_finish(MDRequestRef& mdr, CInode *diri, snapid_t snapid) +{ + dout(10) << "_rmsnap_finish " << *mdr << " " << snapid << dendl; + snapid_t stid = mdr->more()->stid; + auto p = mdr->more()->snapidbl.cbegin(); + snapid_t seq; + decode(seq, p); + + diri->pop_and_dirty_projected_inode(mdr->ls); + mdr->apply(); + + mds->snapclient->commit(stid, mdr->ls); + + dout(10) << "snaprealm now " << *diri->snaprealm << dendl; + + // notify other mds + mdcache->send_snap_update(diri, mdr->more()->stid, CEPH_SNAP_OP_DESTROY); + + mdcache->do_realm_invalidate_and_update_notify(diri, CEPH_SNAP_OP_DESTROY); + + // yay + mdr->in[0] = diri; + respond_to_request(mdr, 0); + + // purge snapshot data + if (diri->snaprealm->have_past_parents_open()) + diri->purge_stale_snap_data(diri->snaprealm->get_snaps()); +} + +struct C_MDS_renamesnap_finish : public ServerLogContext { + CInode *diri; + snapid_t snapid; + C_MDS_renamesnap_finish(Server *s, MDRequestRef& r, CInode *di, snapid_t sn) : + ServerLogContext(s, r), diri(di), snapid(sn) {} + void finish(int r) override { + server->_renamesnap_finish(mdr, diri, snapid); + } +}; + +/* This function takes responsibility for the passed mdr*/ +void Server::handle_client_renamesnap(MDRequestRef& mdr) +{ + const MClientRequest::const_ref &req = mdr->client_request; + if (req->get_filepath().get_ino() != req->get_filepath2().get_ino()) { + respond_to_request(mdr, -EINVAL); + return; + } + + CInode *diri = mdcache->get_inode(req->get_filepath().get_ino()); + if (!diri || diri->state_test(CInode::STATE_PURGING)) { + respond_to_request(mdr, -ESTALE); + return; + } + + if (!diri->is_auth()) { // fw to auth? + mdcache->request_forward(mdr, diri->authority().first); + return; + } + + if (!diri->is_dir()) { // dir only + respond_to_request(mdr, -ENOTDIR); + return; + } + + if (mdr->client_request->get_caller_uid() < g_conf()->mds_snap_min_uid || + mdr->client_request->get_caller_uid() > g_conf()->mds_snap_max_uid) { + respond_to_request(mdr, -EPERM); + return; + } + + std::string_view dstname = req->get_filepath().last_dentry(); + std::string_view srcname = req->get_filepath2().last_dentry(); + dout(10) << "renamesnap " << srcname << "->" << dstname << " on " << *diri << dendl; + + if (srcname.length() == 0 || srcname[0] == '_') { + respond_to_request(mdr, -EINVAL); // can't rename a parent snap. + return; + } + if (!diri->snaprealm || !diri->snaprealm->exists(srcname)) { + respond_to_request(mdr, -ENOENT); + return; + } + if (dstname.length() == 0 || dstname[0] == '_') { + respond_to_request(mdr, -EINVAL); + return; + } + if (diri->snaprealm->exists(dstname)) { + respond_to_request(mdr, -EEXIST); + return; + } + + snapid_t snapid = diri->snaprealm->resolve_snapname(srcname, diri->ino()); + dout(10) << " snapname " << srcname << " is " << snapid << dendl; + + // lock snap + MutationImpl::LockOpVec lov; + + mds->locker->include_snap_rdlocks(diri, lov); + lov.erase_rdlock(&diri->snaplock); + lov.add_xlock(&diri->snaplock); + + if (!mds->locker->acquire_locks(mdr, lov)) + return; + + if (!check_access(mdr, diri, MAY_WRITE|MAY_SNAPSHOT)) + return; + + // prepare + if (!mdr->more()->stid) { + mds->snapclient->prepare_update(diri->ino(), snapid, dstname, utime_t(), + &mdr->more()->stid, + new C_MDS_RetryRequest(mdcache, mdr)); + return; + } + + version_t stid = mdr->more()->stid; + dout(10) << " stid is " << stid << dendl; + + ceph_assert(mds->snapclient->get_cached_version() >= stid); + + // journal + auto &pi = diri->project_inode(false, true); + pi.inode.ctime = mdr->get_op_stamp(); + if (mdr->get_op_stamp() > pi.inode.rstat.rctime) + pi.inode.rstat.rctime = mdr->get_op_stamp(); + pi.inode.version = diri->pre_dirty(); + + // project the snaprealm + auto &newsnap = *pi.snapnode; + auto it = newsnap.snaps.find(snapid); + ceph_assert(it != newsnap.snaps.end()); + it->second.name = dstname; + + // journal the inode changes + mdr->ls = mdlog->get_current_segment(); + EUpdate *le = new EUpdate(mdlog, "renamesnap"); + mdlog->start_entry(le); + + le->metablob.add_client_req(req->get_reqid(), req->get_oldest_client_tid()); + le->metablob.add_table_transaction(TABLE_SNAP, stid); + mdcache->predirty_journal_parents(mdr, &le->metablob, diri, 0, PREDIRTY_PRIMARY, false); + mdcache->journal_dirty_inode(mdr.get(), &le->metablob, diri); + + // journal the snaprealm changes + submit_mdlog_entry(le, new C_MDS_renamesnap_finish(this, mdr, diri, snapid), + mdr, __func__); + mdlog->flush(); +} + +void Server::_renamesnap_finish(MDRequestRef& mdr, CInode *diri, snapid_t snapid) +{ + dout(10) << "_renamesnap_finish " << *mdr << " " << snapid << dendl; + + diri->pop_and_dirty_projected_inode(mdr->ls); + mdr->apply(); + + mds->snapclient->commit(mdr->more()->stid, mdr->ls); + + dout(10) << "snaprealm now " << *diri->snaprealm << dendl; + + // notify other mds + mdcache->send_snap_update(diri, mdr->more()->stid, CEPH_SNAP_OP_UPDATE); + + mdcache->do_realm_invalidate_and_update_notify(diri, CEPH_SNAP_OP_UPDATE); + + // yay + mdr->in[0] = diri; + mdr->tracei = diri; + mdr->snapid = snapid; + respond_to_request(mdr, 0); +} + +/** + * Return true if server is in state RECONNECT and this + * client has not yet reconnected. + */ +bool Server::waiting_for_reconnect(client_t c) const +{ + return client_reconnect_gather.count(c) > 0; +} + +void Server::dump_reconnect_status(Formatter *f) const +{ + f->open_object_section("reconnect_status"); + f->dump_stream("client_reconnect_gather") << client_reconnect_gather; + f->close_section(); +} |