X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Fmds%2FServer.cc;fp=src%2Fceph%2Fsrc%2Fmds%2FServer.cc;h=38c44523e95c90b8858b4bf8b4c35e90d1e3976c;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git diff --git a/src/ceph/src/mds/Server.cc b/src/ceph/src/mds/Server.cc new file mode 100644 index 0000000..38c4452 --- /dev/null +++ b/src/ceph/src/mds/Server.cc @@ -0,0 +1,8848 @@ +// -*- 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 + * + * 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 +#include "include/assert.h" // lexical_cast includes system assert.h + +#include +#include + +#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 "msg/Messenger.h" + +#include "osdc/Objecter.h" + +#include "messages/MClientSession.h" +#include "messages/MClientRequest.h" +#include "messages/MClientReply.h" +#include "messages/MClientReconnect.h" +#include "messages/MClientCaps.h" +#include "messages/MClientSnap.h" + +#include "messages/MMDSSlaveRequest.h" + +#include "messages/MLock.h" + +#include "events/EUpdate.h" +#include "events/ESlaveUpdate.h" +#include "events/ESession.h" +#include "events/EOpen.h" +#include "events/ECommitted.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 + +#include +#include +using namespace std; + +#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 MDSInternalContextBase { + protected: + Server *server; + MDSRank *get_mds() override + { + return server->mds; + } + + public: + explicit ServerContext(Server *s) : server(s) { + 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) { + assert(server != NULL); + } + explicit ServerLogContext(Server *s, MDRequestRef& r) : server(s), mdr(r) { + 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_dispatch_client_request, "dispatch_client_request", "Client requests dispatched"); + plb.add_u64_counter(l_mdss_dispatch_slave_request, "dispatch_server_request", "Server requests dispatched"); + plb.add_u64_counter(l_mdss_req_lookuphash, "req_lookuphash", + "Request type lookup hash of inode"); + plb.add_u64_counter(l_mdss_req_lookupino, "req_lookupino", + "Request type lookup inode"); + plb.add_u64_counter(l_mdss_req_lookupparent, "req_lookupparent", + "Request type lookup parent"); + plb.add_u64_counter(l_mdss_req_lookupname, "req_lookupname", + "Request type lookup name"); + plb.add_u64_counter(l_mdss_req_lookup, "req_lookup", + "Request type lookup"); + plb.add_u64_counter(l_mdss_req_lookupsnap, "req_lookupsnap", + "Request type lookup snapshot"); + plb.add_u64_counter(l_mdss_req_getattr, "req_getattr", + "Request type get attribute"); + plb.add_u64_counter(l_mdss_req_setattr, "req_setattr", + "Request type set attribute"); + plb.add_u64_counter(l_mdss_req_setlayout, "req_setlayout", + "Request type set file layout"); + plb.add_u64_counter(l_mdss_req_setdirlayout, "req_setdirlayout", + "Request type set directory layout"); + plb.add_u64_counter(l_mdss_req_setxattr, "req_setxattr", + "Request type set extended attribute"); + plb.add_u64_counter(l_mdss_req_rmxattr, "req_rmxattr", + "Request type remove extended attribute"); + plb.add_u64_counter(l_mdss_req_readdir, "req_readdir", + "Request type read directory"); + plb.add_u64_counter(l_mdss_req_setfilelock, "req_setfilelock", + "Request type set file lock"); + plb.add_u64_counter(l_mdss_req_getfilelock, "req_getfilelock", + "Request type get file lock"); + plb.add_u64_counter(l_mdss_req_create, "req_create", + "Request type create"); + plb.add_u64_counter(l_mdss_req_open, "req_open", + "Request type open"); + plb.add_u64_counter(l_mdss_req_mknod, "req_mknod", + "Request type make node"); + plb.add_u64_counter(l_mdss_req_link, "req_link", + "Request type link"); + plb.add_u64_counter(l_mdss_req_unlink, "req_unlink", + "Request type unlink"); + plb.add_u64_counter(l_mdss_req_rmdir, "req_rmdir", + "Request type remove directory"); + plb.add_u64_counter(l_mdss_req_rename, "req_rename", + "Request type rename"); + plb.add_u64_counter(l_mdss_req_mkdir, "req_mkdir", + "Request type make directory"); + plb.add_u64_counter(l_mdss_req_symlink, "req_symlink", + "Request type symbolic link"); + plb.add_u64_counter(l_mdss_req_lssnap, "req_lssnap", + "Request type list snapshot"); + plb.add_u64_counter(l_mdss_req_mksnap, "req_mksnap", + "Request type make snapshot"); + plb.add_u64_counter(l_mdss_req_rmsnap, "req_rmsnap", + "Request type remove snapshot"); + plb.add_u64_counter(l_mdss_req_renamesnap, "req_renamesnap", + "Request type rename snapshot"); + 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) +{ +} + + +/* This function DOES put the passed message before returning*/ +void Server::dispatch(Message *m) +{ + switch (m->get_type()) { + case CEPH_MSG_CLIENT_RECONNECT: + handle_client_reconnect(static_cast(m)); + return; + } + + // active? + if (!mds->is_active() && + !(mds->is_stopping() && m->get_source().is_mds())) { + if (m->get_type() == CEPH_MSG_CLIENT_REQUEST && + (mds->is_reconnect() || mds->get_want_state() == CEPH_MDS_STATE_RECONNECT)) { + MClientRequest *req = static_cast(m); + Session *session = get_session(req); + if (!session || session->is_closed()) { + dout(5) << "session is closed, dropping " << req->get_reqid() << dendl; + req->put(); + return; + } + bool queue_replay = false; + if (req->is_replay()) { + dout(3) << "queuing replayed op" << dendl; + queue_replay = true; + } 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 (m->get_type() == MSG_MDS_SLAVE_REQUEST) { + // handle_slave_request() will wait if necessary + wait_for_active = false; + } else if (mds->is_clientreplay()) { + // session open requests need to be handled during replay, + // close requests need to be delayed + if ((m->get_type() == CEPH_MSG_CLIENT_SESSION && + (static_cast(m))->get_op() != CEPH_SESSION_REQUEST_CLOSE)) { + wait_for_active = false; + } else if (m->get_type() == CEPH_MSG_CLIENT_REQUEST) { + MClientRequest *req = static_cast(m); + 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(static_cast(m)); + return; + case CEPH_MSG_CLIENT_REQUEST: + handle_client_request(static_cast(m)); + return; + case MSG_MDS_SLAVE_REQUEST: + handle_slave_request(static_cast(m)); + return; + default: + derr << "server unknown message " << m->get_type() << dendl; + assert(0 == "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 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& 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 { + assert(r == 0); + server->_session_logged(session, state_seq, open, cmapv, inos, inotablev); + if (fin) { + fin->complete(r); + } + } +}; + +Session *Server::get_session(Message *m) +{ + Session *session = static_cast(m->get_connection()->get_priv()); + if (session) { + dout(20) << "get_session have " << session << " " << session->info.inst + << " state " << session->get_state_name() << dendl; + session->put(); // not carry ref + } else { + dout(20) << "get_session dne for " << m->get_source_inst() << dendl; + } + return session; +} + +/* This function DOES put the passed message before returning*/ +void Server::handle_client_session(MClientSession *m) +{ + version_t pv; + bool blacklisted = false; + Session *session = get_session(m); + + dout(3) << "handle_client_session " << *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; + m->put(); + 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()) { + dout(10) << "currently open|opening|stale|killing, dropping this req" << dendl; + // set client metadata for session opened by prepare_force_open_sessions + if (!m->client_meta.empty()) + session->set_client_metadata(m->client_meta); + m->put(); + return; + } + assert(session->is_closed() || + session->is_closing()); + + blacklisted = mds->objecter->with_osdmap( + [session](const OSDMap &osd_map) -> bool { + return osd_map.is_blacklisted(session->info.inst.addr); + }); + + if (blacklisted) { + dout(10) << "ignoring blacklisted client " << session->info.inst.addr << dendl; + m->put(); + return; + } + + session->set_client_metadata(m->client_meta); + dout(20) << __func__ << " CEPH_SESSION_REQUEST_OPEN " + << session->info.client_metadata.size() << " metadata entries:" << dendl; + for (map::iterator i = session->info.client_metadata.begin(); + i != session->info.client_metadata.end(); ++i) { + dout(20) << " " << i->first << ": " << i->second << dendl; + } + + // Special case for the 'root' metadata path; validate that the claimed + // root is actually within the caps of the session + if (session->info.client_metadata.count("root")) { + const auto claimed_root = session->info.client_metadata.at("root"); + // claimed_root has a leading "/" which we strip before passing + // into caps check + if (claimed_root.empty() || claimed_root[0] != '/' || + !session->auth_caps.path_capable(claimed_root.substr(1))) { + derr << __func__ << " forbidden path claimed as mount root: " + << claimed_root << " by " << m->get_source() << dendl; + // Tell the client we're rejecting their open + mds->send_message_client(new MClientSession(CEPH_SESSION_REJECT), session); + mds->clog->warn() << "client session with invalid root '" << + claimed_root << "' denied (" << session->info.inst << ")"; + session->clear(); + // Drop out; don't record this session in SessionMap or journal it. + 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); + mdlog->start_submit_entry(new ESession(m->get_source_inst(), true, pv, m->client_meta), + new C_MDS_session_finish(this, session, sseq, true, pv)); + 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); + } + m->get_connection()->send_message(new MClientSession(CEPH_SESSION_RENEWCAPS, m->get_seq())); + } 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; + m->put(); + return; + } + if (session->is_importing()) { + dout(10) << "ignoring close req on importing session" << dendl; + m->put(); + return; + } + 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; + m->put(); + 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(); + m->put(); + 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: + mdlog->flush(); + break; + + default: + ceph_abort(); + } + m->put(); +} + +void Server::flush_client_sessions(set& client_set, MDSGatherBuilder& gather) +{ + for (set::iterator p = client_set.begin(); p != client_set.end(); ++p) { + Session *session = mds->sessionmap.get_session(entity_name_t::CLIENT(p->v)); + assert(session); + if (!session->is_open() || + !session->connection.get() || + !session->connection->has_feature(CEPH_FEATURE_EXPORT_PEER)) + continue; + version_t seq = session->wait_for_flush(gather.new_sub()); + mds->send_message_client(new MClientSession(CEPH_SESSION_FLUSHMSG, seq), session); + } +} + +void Server::finish_flush_session(Session *session, version_t seq) +{ + list 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& inos, version_t piv) +{ + dout(10) << "_session_logged " << session->info.inst << " state_seq " << state_seq << " " << (open ? "open":"close") + << " " << pv << dendl; + + if (piv) { + 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); + 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) { + assert(session->is_opening()); + mds->sessionmap.set_state(session, Session::STATE_OPEN); + mds->sessionmap.touch_session(session); + assert(session->connection != NULL); + session->connection->send_message(new MClientSession(CEPH_SESSION_OPEN)); + if (mdcache->is_readonly()) + session->connection->send_message(new MClientSession(CEPH_SESSION_FORCE_RO)); + } else if (session->is_closing() || + session->is_killing()) { + // kill any lingering capabilities, leases, requests + 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, session->info.inst.name.num()); + } + while (!session->leases.empty()) { + ClientLease *r = session->leases.front(); + CDentry *dn = static_cast(r->parent); + dout(20) << " killing client lease of " << *dn << dendl; + dn->remove_client_lease(r, mds->locker); + } + if (client_reconnect_gather.count(session->info.get_client())) { + dout(20) << " removing client from reconnect set" << dendl; + client_reconnect_gather.erase(session->info.get_client()); + + if (client_reconnect_gather.empty()) { + dout(7) << " client " << session->info.inst << " was last reconnect, finishing" << dendl; + reconnect_gather_finish(); + } + } + + 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->connection != NULL) { + // Conditional because terminate_sessions will indiscrimately + // put sessions in CLOSING whether they ever had a conn or not. + session->connection->mark_disposable(); + } + + // reset session + mds->send_message_client(new MClientSession(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->connection != NULL) { + session->connection->mark_down(); + } + 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& cm, + map& sseqmap) +{ + version_t pv = mds->sessionmap.get_projected(); + + dout(10) << "prepare_force_open_sessions " << pv + << " on " << cm.size() << " clients" + << dendl; + for (map::iterator p = cm.begin(); p != cm.end(); ++p) { + + Session *session = mds->sessionmap.get_or_add_session(p->second); + pv = mds->sessionmap.mark_projected(session); + if (session->is_closed() || + session->is_closing() || + session->is_killing()) + sseqmap[p->first] = mds->sessionmap.set_state(session, Session::STATE_OPENING); + else + assert(session->is_open() || + session->is_opening() || + session->is_stale()); + session->inc_importing(); + } + return pv; +} + +void Server::finish_force_open_sessions(map& cm, + map& sseqmap, + 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 " << cm.size() << " clients," + << " initial v " << mds->sessionmap.get_version() << dendl; + + + for (map::iterator p = cm.begin(); p != cm.end(); ++p) { + + Session *session = mds->sessionmap.get_session(p->second.name); + assert(session); + + if (sseqmap.count(p->first)) { + uint64_t sseq = sseqmap[p->first]; + 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); + mds->send_message_client(new MClientSession(CEPH_SESSION_OPEN), session); + if (mdcache->is_readonly()) + mds->send_message_client(new MClientSession(CEPH_SESSION_FORCE_RO), session); + } + } else { + dout(10) << "force_open_sessions skipping already-open " << session->info.inst << dendl; + 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(2) << "terminate_sessions" << dendl; + + terminating_sessions = true; + + // kill them off. clients will retry etc. + set sessions; + mds->sessionmap.get_client_session_set(sessions); + for (set::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() +{ + dout(10) << "find_idle_sessions. laggy until " << mds->get_laggy_until() << dendl; + + // timeout/stale + // (caps go stale, lease die) + utime_t now = ceph_clock_now(); + utime_t cutoff = now; + cutoff -= g_conf->mds_session_timeout; + while (1) { + Session *session = mds->sessionmap.get_oldest_session(Session::STATE_OPEN); + if (!session) break; + dout(20) << "laggiest active session is " << session->info.inst << dendl; + if (session->last_cap_renew >= cutoff) { + dout(20) << "laggiest active session is " << session->info.inst << " and sufficiently new (" + << session->last_cap_renew << ")" << dendl; + break; + } + + dout(10) << "new stale session " << session->info.inst << " last " << session->last_cap_renew << dendl; + mds->sessionmap.set_state(session, Session::STATE_STALE); + mds->locker->revoke_stale_caps(session); + mds->locker->remove_stale_leases(session); + mds->send_message_client(new MClientSession(CEPH_SESSION_STALE, session->get_push_seq()), session); + finish_flush_session(session, session->get_push_seq()); + } + + // autoclose + cutoff = now; + cutoff -= g_conf->mds_session_autoclose; + + // don't kick clients if we've been laggy + if (mds->get_laggy_until() > cutoff) { + dout(10) << " laggy_until " << mds->get_laggy_until() << " > cutoff " << cutoff + << ", not kicking any clients to be safe" << dendl; + return; + } + + if (mds->sessionmap.get_sessions().size() == 1 && + mds->mdsmap->get_num_in_mds() == 1) { + dout(20) << "not evicting a slow client, because there is only one" + << dendl; + return; + } + + // Collect a list of sessions exceeding the autoclose threshold + std::vector to_evict; + const auto sessions_p = mds->sessionmap.by_state.find(Session::STATE_STALE); + if (sessions_p == mds->sessionmap.by_state.end() || sessions_p->second->empty()) { + return; + } + const auto &stale_sessions = sessions_p->second; + assert(stale_sessions != nullptr); + + for (const auto &session: *stale_sessions) { + if (session->is_importing()) { + dout(10) << "stopping at importing session " << session->info.inst << dendl; + break; + } + assert(session->is_stale()); + if (session->last_cap_renew >= cutoff) { + dout(20) << "oldest stale session is " << session->info.inst << " and sufficiently new (" + << session->last_cap_renew << ")" << dendl; + break; + } + + to_evict.push_back(session); + } + + for (const auto &session: to_evict) { + utime_t age = now; + age -= session->last_cap_renew; + mds->clog->warn() << "evicting unresponsive client " << *session + << ", after " << age << " seconds"; + dout(10) << "autoclosing stale session " << session->info.inst << " last " + << session->last_cap_renew << dendl; + + if (g_conf->mds_session_blacklist_on_timeout) { + std::stringstream ss; + mds->evict_client(session->info.inst.name.num(), false, true, + ss, nullptr); + } else { + kill_session(session, NULL); + } + } +} + +/* + * XXX bump in the interface here, not using an MDSInternalContextBase here + * because all the callers right now happen to use a SaferCond + */ +void Server::kill_session(Session *session, Context *on_safe) +{ + 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; + assert(session->is_closing() || + session->is_closed() || + session->is_killing() || + session->is_importing()); + if (on_safe) { + on_safe->complete(0); + } + } +} + +size_t Server::apply_blacklist(const std::set &blacklist) +{ + std::list 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; + if (blacklist.count(s->info.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 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 + elist::iterator p = + session->requests.begin(member_offset(MDRequestImpl, + item_session_request)); + while (!p.end()) { + MDRequestRef mdr = mdcache->request_get((*p)->reqid); + ++p; + mdcache->request_kill(mdr); + } + + finish_flush_session(session, session->get_push_seq()); +} + +void Server::reconnect_clients(MDSInternalContext *reconnect_done_) +{ + reconnect_done = reconnect_done_; + mds->sessionmap.get_client_set(client_reconnect_gather); + + 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 = ceph_clock_now(); + dout(1) << "reconnect_clients -- " << client_reconnect_gather.size() << " sessions" << dendl; + mds->sessionmap.dump(); +} + +/* This function DOES put the passed message before returning*/ +void Server::handle_client_reconnect(MClientReconnect *m) +{ + dout(7) << "handle_client_reconnect " << m->get_source() << dendl; + client_t from = m->get_source().num(); + Session *session = get_session(m); + assert(session); + + 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; + } + + utime_t delay = ceph_clock_now(); + delay -= reconnect_start; + dout(10) << " reconnect_start " << reconnect_start << " delay " << delay << dendl; + + bool deny = false; + if (!mds->is_reconnect()) { + // 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 if (session->is_closed()) { + dout(1) << " session is closed, 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() << " (session is closed)"; + deny = true; + } else if (mdcache->is_readonly()) { + dout(1) << " read-only FS, ignoring reconnect, sending close" << dendl; + mds->clog->info() << "denied reconnect attempt (mds is read-only)"; + deny = true; + } + + if (deny) { + m->get_connection()->send_message(new MClientSession(CEPH_SESSION_CLOSE)); + m->put(); + return; + } + + // notify client of success with an OPEN + m->get_connection()->send_message(new MClientSession(CEPH_SESSION_OPEN)); + session->last_cap_renew = ceph_clock_now(); + mds->clog->debug() << "reconnect by " << session->info.inst << " after " << delay; + + // snaprealms + for (vector::iterator p = m->realms.begin(); + p != m->realms.end(); + ++p) { + CInode *in = mdcache->get_inode(inodeno_t(p->ino)); + if (in && in->state_test(CInode::STATE_PURGING)) + continue; + if (in) { + assert(in->snaprealm); + if (in->snaprealm->have_past_parents_open()) { + dout(15) << "open snaprealm (w/ past parents) on " << *in << dendl; + mdcache->finish_snaprealm_reconnect(from, in->snaprealm, snapid_t(p->seq)); + } else { + dout(15) << "open snaprealm (w/o past parents) on " << *in << dendl; + mdcache->add_reconnected_snaprealm(from, inodeno_t(p->ino), snapid_t(p->seq)); + } + } else { + dout(15) << "open snaprealm (w/o inode) on " << inodeno_t(p->ino) + << " seq " << p->seq << dendl; + mdcache->add_reconnected_snaprealm(from, inodeno_t(p->ino), snapid_t(p->seq)); + } + } + + // caps + for (map::iterator p = m->caps.begin(); + p != m->caps.end(); + ++p) { + // 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. + p->second.path.clear(); // we don't need path + mdcache->rejoin_export_caps(p->first, from, p->second, + in->authority().first); + } else { + // don't know if the inode is mine + dout(10) << "missing ino " << p->first << ", will load later" << dendl; + p->second.path.clear(); // we don't need path + mdcache->rejoin_recovered_caps(p->first, from, p->second, MDS_RANK_NONE); + } + } + + // remove from gather set + client_reconnect_gather.erase(from); + if (client_reconnect_gather.empty()) + reconnect_gather_finish(); + + m->put(); +} + + + +void Server::reconnect_gather_finish() +{ + dout(7) << "reconnect_gather_finish. failed on " << failed_reconnects << " clients" << dendl; + assert(reconnect_done); + reconnect_done->complete(0); + reconnect_done = NULL; +} + +void Server::reconnect_tick() +{ + if (reconnect_evicting) { + dout(4) << "reconnect_tick: waiting for evictions" << dendl; + return; + } + + utime_t reconnect_end = reconnect_start; + reconnect_end += g_conf->mds_reconnect_timeout; + if (ceph_clock_now() >= reconnect_end && + !client_reconnect_gather.empty()) { + dout(10) << "reconnect timed out" << 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 (set::iterator p = client_reconnect_gather.begin(); + p != client_reconnect_gather.end(); + ++p) { + Session *session = mds->sessionmap.get_session(entity_name_t::CLIENT(p->v)); + assert(session); + dout(1) << "reconnect gave up on " << session->info.inst << dendl; + + mds->clog->warn() << "evicting unresponsive client " << *session + << ", after waiting " << g_conf->mds_reconnect_timeout + << " seconds during MDS startup"; + + if (g_conf->mds_session_blacklist_on_timeout) { + std::stringstream ss; + mds->evict_client(session->info.inst.name.num(), 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; + bufferlist::iterator p = locks.begin(); + ::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(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 (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. + */ +void Server::recall_client_state(void) +{ + /* try to recall at least 80% of all caps */ + uint64_t max_caps_per_client = Capability::count() * g_conf->get_val("mds_max_ratio_caps_per_client"); + uint64_t min_caps_per_client = g_conf->get_val("mds_min_caps_per_client"); + if (max_caps_per_client < min_caps_per_client) { + dout(0) << "max_caps_per_client " << max_caps_per_client + << " < min_caps_per_client " << min_caps_per_client << dendl; + max_caps_per_client = min_caps_per_client + 1; + } + + /* unless this ratio is smaller: */ + /* ratio: determine the amount of caps to recall from each client. Use + * percentage full over the cache reservation. Cap the ratio at 80% of client + * caps. */ + double ratio = 1.0-fmin(0.80, mdcache->cache_toofull_ratio()); + + dout(10) << "recall_client_state " << ratio + << ", caps per client " << min_caps_per_client << "-" << max_caps_per_client + << dendl; + + set sessions; + mds->sessionmap.get_client_session_set(sessions); + for (auto &session : sessions) { + if (!session->is_open() || + !session->info.inst.name.is_client()) + continue; + + dout(10) << " session " << session->info.inst + << " caps " << session->caps.size() + << ", leases " << session->leases.size() + << dendl; + + uint64_t newlim = MAX(MIN((session->caps.size() * ratio), max_caps_per_client), min_caps_per_client); + if (session->caps.size() > newlim) { + MClientSession *m = new MClientSession(CEPH_SESSION_RECALL_STATE); + m->head.max_caps = newlim; + mds->send_message_client(m, session); + session->notify_recall_sent(newlim); + } + } +} + +void Server::force_clients_readonly() +{ + dout(10) << "force_clients_readonly" << dendl; + set sessions; + mds->sessionmap.get_client_session_set(sessions); + for (set::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(new MClientSession(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; + 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, flushing" << dendl; + mdlog->flush(); + } + } else if (mdr->did_early_reply) + mds->locker->drop_rdlocks(mdr.get()); + else + mdlog->flush(); +} + +void Server::submit_mdlog_entry(LogEvent *le, MDSLogContextBase *fin, MDRequestRef& mdr, + const char *event) +{ + if (mdr) { + string event_str("submit entry: "); + event_str += event; + mdr->mark_event_string(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, new MClientReply(mdr->client_request, r)); + + // add here to avoid counting ops multiple times (e.g., locks, loading) + switch(mdr->client_request->get_op()) { + case CEPH_MDS_OP_LOOKUPHASH: + logger->inc(l_mdss_req_lookuphash); + break; + case CEPH_MDS_OP_LOOKUPINO: + logger->inc(l_mdss_req_lookupino); + break; + case CEPH_MDS_OP_LOOKUPPARENT: + logger->inc(l_mdss_req_lookupparent); + break; + case CEPH_MDS_OP_LOOKUPNAME: + logger->inc(l_mdss_req_lookupname); + break; + case CEPH_MDS_OP_LOOKUP: + logger->inc(l_mdss_req_lookup); + break; + case CEPH_MDS_OP_LOOKUPSNAP: + logger->inc(l_mdss_req_lookupsnap); + break; + case CEPH_MDS_OP_GETATTR: + logger->inc(l_mdss_req_getattr); + break; + case CEPH_MDS_OP_SETATTR: + logger->inc(l_mdss_req_setattr); + break; + case CEPH_MDS_OP_SETLAYOUT: + logger->inc(l_mdss_req_setlayout); + break; + case CEPH_MDS_OP_SETDIRLAYOUT: + logger->inc(l_mdss_req_setdirlayout); + break; + case CEPH_MDS_OP_SETXATTR: + logger->inc(l_mdss_req_setxattr); + break; + case CEPH_MDS_OP_RMXATTR: + logger->inc(l_mdss_req_rmxattr); + break; + case CEPH_MDS_OP_READDIR: + logger->inc(l_mdss_req_readdir); + break; + case CEPH_MDS_OP_SETFILELOCK: + logger->inc(l_mdss_req_setfilelock); + break; + case CEPH_MDS_OP_GETFILELOCK: + logger->inc(l_mdss_req_getfilelock); + break; + case CEPH_MDS_OP_CREATE: + logger->inc(l_mdss_req_create); + case CEPH_MDS_OP_OPEN: + logger->inc(l_mdss_req_open); + break; + case CEPH_MDS_OP_MKNOD: + logger->inc(l_mdss_req_mknod); + break; + case CEPH_MDS_OP_LINK: + logger->inc(l_mdss_req_link); + break; + case CEPH_MDS_OP_UNLINK: + logger->inc(l_mdss_req_unlink); + break; + case CEPH_MDS_OP_RMDIR: + logger->inc(l_mdss_req_rmdir); + break; + case CEPH_MDS_OP_RENAME: + logger->inc(l_mdss_req_rename); + break; + case CEPH_MDS_OP_MKDIR: + logger->inc(l_mdss_req_mkdir); + break; + case CEPH_MDS_OP_SYMLINK: + logger->inc(l_mdss_req_symlink); + break; + case CEPH_MDS_OP_LSSNAP: + logger->inc(l_mdss_req_lssnap); + break; + case CEPH_MDS_OP_MKSNAP: + logger->inc(l_mdss_req_mksnap); + break; + case CEPH_MDS_OP_RMSNAP: + logger->inc(l_mdss_req_rmsnap); + break; + case CEPH_MDS_OP_RENAMESNAP: + logger->inc(l_mdss_req_renamesnap); + break; + } + } else if (mdr->internal_op > -1) { + dout(10) << "respond_to_request on internal request " << mdr << dendl; + if (!mdr->internal_op_finish) + assert(0 == "trying to respond to internal op without finisher"); + mdr->internal_op_finish->complete(r); + mdcache->request_finish(mdr); + } +} + +void Server::early_reply(MDRequestRef& mdr, CInode *tracei, CDentry *tracedn) +{ + if (!g_conf->mds_early_reply) + 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; + } + + MClientRequest *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; + } + + + MClientReply *reply = new MClientReply(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); + req->get_connection()->send_message(reply); + + 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); + 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, MClientReply *reply) +{ + assert(mdr.get()); + MClientRequest *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); + 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 (client_inst.name.is_mds() || !session) { + reply->put(); // mds doesn't need a reply + reply = 0; + } else { + // 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()); + req->get_connection()->send_message(reply); + } + + 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); + } +} + + +void Server::encode_empty_dirstat(bufferlist& bl) +{ + static DirStat empty; + empty.encode(bl); +} + +void Server::encode_infinite_lease(bufferlist& bl) +{ + LeaseStat e; + e.seq = 0; + e.mask = -1; + e.duration_ms = -1; + ::encode(e, bl); + dout(20) << "encode_infinite_lease " << e << dendl; +} + +void Server::encode_null_lease(bufferlist& bl) +{ + LeaseStat e; + e.seq = 0; + e.mask = 0; + e.duration_ms = 0; + ::encode(e, bl); + dout(20) << "encode_null_lease " << e << dendl; +} + + +/* + * 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, MClientReply *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 + dir->encode_dirstat(bl, whoami); + 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 + encode_null_lease(bl); + 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); +} + + + + +/*** + * process a client request + * This function DOES put the passed message before returning + */ +void Server::handle_client_request(MClientRequest *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; + } + + // active session? + Session *session = 0; + if (req->get_source().is_client()) { + session = get_session(req); + if (!session) { + dout(5) << "no session for " << req->get_source() << ", dropping" << dendl; + } else if (session->is_closed() || + 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(); + req->put(); + 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()) { + assert(session); + inodeno_t created; + if (session->have_completed_request(req->get_reqid().tid, &created)) { + has_completed = true; + // 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; + MClientReply *reply = new MClientReply(req, 0); + if (created != inodeno_t()) { + bufferlist extra; + ::encode(created, extra); + reply->set_extra_bl(extra); + } + req->get_connection()->send_message(reply); + + if (req->is_queued_for_replay()) + mds->queue_one_replay(); + + req->put(); + 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; + 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 (vector::iterator p = req->releases.begin(); + p != req->releases.end(); + ++p) + mds->locker->process_request_cap_release(mdr, client, p->item, p->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) { + is_full = o.test_flag(CEPH_OSDMAP_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. + assert(!mdr->has_more() || mdr->more()->waiting_on_slave.empty()); + + if (mdr->killed) { + dout(10) << "request " << *mdr << " was killed" << dendl; + return; + } + + MClientRequest *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 + +/* This function DOES put the passed message before returning*/ +void Server::handle_slave_request(MMDSSlaveRequest *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) { + MMDSSlaveRequest *reply = new MMDSSlaveRequest(m->get_reqid(), m->get_attempt(), + MMDSSlaveRequest::OP_RENAMENOTIFYACK); + mds->send_message(reply, m->get_connection()); + m->put(); + return; + } + + CDentry *straydn = NULL; + if (m->stray.length() > 0) { + straydn = mdcache->add_replica_stray(m->stray, from); + assert(straydn); + m->stray.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; + m->put(); + 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; + m->put(); + 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 + 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; + m->put(); + return; + } + mdr = mdcache->request_start_slave(m->get_reqid(), m->get_attempt(), m); + mdr->set_op_stamp(m->op_stamp); + } + 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->slave_request = m; + + dispatch_slave_request(mdr); +} + +/* This function DOES put the passed message before returning*/ +void Server::handle_slave_request_reply(MMDSSlaveRequest *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; + m->put(); + 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); + m->put(); + 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; + m->put(); + 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); + dout(10) << "got remote xlock on " << *lock << " on " << *lock->get_parent() << dendl; + mdr->xlocks.insert(lock); + mdr->locks.insert(lock); + mdr->finish_locking(lock); + lock->get_xlock(mdr, mdr->get_client()); + + assert(mdr->more()->waiting_on_slave.count(from)); + mdr->more()->waiting_on_slave.erase(from); + 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; + mdr->remote_wrlocks[lock] = from; + mdr->locks.insert(lock); + mdr->finish_locking(lock); + + assert(mdr->more()->waiting_on_slave.count(from)); + mdr->more()->waiting_on_slave.erase(from); + 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(); + } + + // done with reply. + m->put(); +} + +/* This function DOES put the mdr->slave_request before returning*/ +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. + set rdlocks; + set wrlocks = mdr->wrlocks; + set xlocks = mdr->xlocks; + + int replycode = 0; + switch (op) { + case MMDSSlaveRequest::OP_XLOCK: + xlocks.insert(lock); + replycode = MMDSSlaveRequest::OP_XLOCKACK; + break; + case MMDSSlaveRequest::OP_WRLOCK: + wrlocks.insert(lock); + replycode = MMDSSlaveRequest::OP_WRLOCKACK; + break; + } + + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + return; + + // ack + MMDSSlaveRequest *r = new MMDSSlaveRequest(mdr->reqid, mdr->attempt, replycode); + r->set_lock_type(lock->get_type()); + lock->get_parent()->set_object_info(r->get_object_info()); + mds->send_message(r, mdr->slave_request->get_connection()); + } + + // done. + mdr->slave_request->put(); + mdr->slave_request = 0; + } + 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()); + assert(lock); + bool need_issue = false; + switch (op) { + case MMDSSlaveRequest::OP_UNXLOCK: + mds->locker->xlock_finish(lock, mdr.get(), &need_issue); + break; + case MMDSSlaveRequest::OP_UNWRLOCK: + mds->locker->wrlock_finish(lock, mdr.get(), &need_issue); + break; + } + if (need_issue) + mds->locker->issue_caps(static_cast(lock->get_parent())); + + // done. no ack necessary. + mdr->slave_request->put(); + mdr->slave_request = 0; + } + break; + + case MMDSSlaveRequest::OP_DROPLOCKS: + mds->locker->drop_locks(mdr.get()); + mdr->slave_request->put(); + mdr->slave_request = 0; + 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.claim(mdr->slave_request->inode_export); + // finish off request. + mdcache->request_finish(mdr); + break; + + default: + ceph_abort(); + } +} + +/* This function DOES put the mdr->slave_request before returning*/ +void Server::handle_slave_auth_pin(MDRequestRef& mdr) +{ + dout(10) << "handle_slave_auth_pin " << *mdr << dendl; + + // build list of objects + list 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 (vector::iterator p = mdr->slave_request->get_authpins().begin(); + p != mdr->slave_request->get_authpins().end(); + ++p) { + MDSCacheObject *object = mdcache->get_object(*p); + if (!object) { + dout(10) << " don't have " << *p << dendl; + fail = true; + break; + } + + objects.push_back(object); + if (*p == mdr->slave_request->get_authpin_freeze()) + auth_pin_freeze = static_cast(object); + } + } + + // can we auth pin them? + if (!fail) { + for (list::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::iterator p = objects.begin(); + p != objects.end(); + ++p) { + dout(10) << "auth_pinning " << **p << dendl; + mdr->auth_pin(*p); + } + } + + // ack! + MMDSSlaveRequest *reply = new MMDSSlaveRequest(mdr->reqid, mdr->attempt, MMDSSlaveRequest::OP_AUTHPINACK); + + // return list of my auth_pins (if any) + for (set::iterator p = mdr->auth_pins.begin(); + p != mdr->auth_pins.end(); + ++p) { + 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->slave_request->put(); + mdr->slave_request = 0; + return; +} + +/* This function DOES NOT put the passed ack before returning*/ +void Server::handle_slave_auth_pin_ack(MDRequestRef& mdr, MMDSSlaveRequest *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 pinned; + for (vector::iterator p = ack->get_authpins().begin(); + p != ack->get_authpins().end(); + ++p) { + MDSCacheObject *object = mdcache->get_object(*p); + 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 (*p == ack->get_authpin_freeze()) + mdr->set_remote_frozen_auth_pin(static_cast(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); + assert(p != mdr->remote_auth_pins.end()); + if (p->second == from) { + mdr->more()->is_remote_frozen_authpin = false; + } + } + + // removed auth pins? + map::iterator 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 + 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, const string& 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, const string& dname, bool okexist) +{ + dout(10) << "prepare_null_dentry " << dname << " in " << *dir << dendl; + 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 { + dn->first = dir->inode->find_snaprealm()->get_newest_seq() + 1; + } + + 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, dir->inode->find_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; + + 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_opening(); + + // 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(); + 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); + 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; + + 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; + + MClientRequest *req = mdr->client_request; + if (req->get_data().length()) { + bufferlist::iterator p = req->get_data().begin(); + + // xattrs on new inode? + map xattrs; + ::decode(xattrs, p); + for (map::iterator p = xattrs.begin(); p != xattrs.end(); ++p) { + dout(10) << "prepare_new_inode setting xattr " << p->first << dendl; + in->xattrs[p->first] = p->second; + } + } + + if (!mds->mdsmap->get_inline_data_enabled() || + !mdr->session->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()) { + assert(session); + session->pending_prealloc_inos.subtract(mdr->prealloc_inos); + session->info.prealloc_inos.insert(mdr->prealloc_inos); + mds->sessionmap.mark_dirty(session); + mds->inotable->apply_alloc_ids(mdr->prealloc_inos); + } + if (mdr->used_prealloc_ino) { + 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); + } +}; + +CDir *Server::traverse_to_auth_dir(MDRequestRef& mdr, vector &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; + int r = mdcache->path_traverse(mdr, NULL, NULL, 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, + set &rdlocks, + 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 + int r = mdcache->path_traverse(mdr, NULL, NULL, 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].size()) { + if (!no_lookup) + mdr->tracedn = mdr->dn[n][mdr->dn[n].size()-1]; + respond_to_request(mdr, r); + } else if (r == -ESTALE) { + dout(10) << "FAIL on ESTALE but attempting recovery" << dendl; + MDSInternalContextBase *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++) + rdlocks.insert(&mdr->dn[n][i]->lock); + if (layout) + mds->locker->include_snap_rdlocks_wlayout(rdlocks, ref, layout); + else + mds->locker->include_snap_rdlocks(rdlocks, ref); + + // 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, + set& rdlocks, set& wrlocks, set& xlocks, + 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? + const string &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++) + rdlocks.insert(&mdr->dn[n][i]->lock); + if (alwaysxlock || dnl->is_null()) + xlocks.insert(&dn->lock); // new dn, xlock + else + rdlocks.insert(&dn->lock); // existing dn, rdlock + wrlocks.insert(&dn->get_dir()->inode->filelock); // also, wrlock on dir mtime + wrlocks.insert(&dn->get_dir()->inode->nestlock); // also, wrlock on dir mtime + if (layout) + mds->locker->include_snap_rdlocks_wlayout(rdlocks, dn->get_dir()->inode, layout); + else + mds->locker->include_snap_rdlocks(rdlocks, dn->get_dir()->inode); + + 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; + 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) +{ + MClientRequest *req = mdr->client_request; + set rdlocks, wrlocks, xlocks; + + 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; + } + + CInode *ref = rdlock_path_pin_ref(mdr, 0, rdlocks, false, 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(); + + int mask = req->head.args.getattr.mask; + if ((mask & CEPH_CAP_LINK_SHARED) && (issued & CEPH_CAP_LINK_EXCL) == 0) rdlocks.insert(&ref->linklock); + if ((mask & CEPH_CAP_AUTH_SHARED) && (issued & CEPH_CAP_AUTH_EXCL) == 0) rdlocks.insert(&ref->authlock); + if ((mask & CEPH_CAP_FILE_SHARED) && (issued & CEPH_CAP_FILE_EXCL) == 0) rdlocks.insert(&ref->filelock); + if ((mask & CEPH_CAP_XATTR_SHARED) && (issued & CEPH_CAP_XATTR_EXCL) == 0) rdlocks.insert(&ref->xattrlock); + + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + return; + + if (!check_access(mdr, ref, MAY_READ)) + return; + + // 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(ceph_clock_now(), 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); + } +}; + +/* This function DOES clean up the mdr before returning*/ +/* + * filepath: ino + */ +void Server::handle_client_lookup_ino(MDRequestRef& mdr, + bool want_parent, bool want_dentry) +{ + MClientRequest *req = mdr->client_request; + + 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->is_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; + + set rdlocks; + if (dn && (want_parent || want_dentry)) { + mdr->pin(dn); + rdlocks.insert(&dn->lock); + } + + unsigned mask = req->head.args.getattr.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) + rdlocks.insert(&in->authlock); + if ((mask & CEPH_CAP_XATTR_SHARED) && (issued & CEPH_CAP_XATTR_EXCL) == 0) + rdlocks.insert(&in->xattrlock); + + mdr->getattr_caps = mask; + } + + if (!rdlocks.empty()) { + set wrlocks, xlocks; + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + 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_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) +{ + MClientRequest *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; + } + + set rdlocks, wrlocks, xlocks; + CInode *cur = rdlock_path_pin_ref(mdr, 0, rdlocks, need_auth); + if (!cur) + return; + + if (cur->is_frozen() || cur->state_test(CInode::STATE_EXPORTINGCAPS)) { + assert(!need_auth); + mdr->done_locking = false; + CInode *cur = rdlock_path_pin_ref(mdr, 0, rdlocks, 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->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) + rdlocks.insert(&cur->authlock); + if ((mask & CEPH_CAP_XATTR_SHARED) && (issued & CEPH_CAP_XATTR_EXCL) == 0) + rdlocks.insert(&cur->xattrlock); + + mdr->getattr_caps = mask; + } + + // O_TRUNC + if ((flags & CEPH_O_TRUNC) && !mdr->has_completed) { + assert(cur->is_auth()); + + xlocks.insert(&cur->filelock); + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + return; + + if (!check_access(mdr, cur, MAY_WRITE)) + return; + + // wait for pending truncate? + const inode_t *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()) { + rdlocks.insert(&cur->filelock); + } + + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + return; + + mask = MAY_READ; + if (cmode & CEPH_FILE_MODE_WR) + mask |= MAY_WRITE; + if (!check_access(mdr, cur, mask)) + return; + + 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 && + !cur->item_open_file.is_on_list()) { + LogSegment *ls = mds->mdlog->get_current_segment(); + EOpen *le = new EOpen(mds->mdlog); + mdlog->start_entry(le); + le->add_clean_inode(cur); + ls->open_files.push_back(&cur->item_open_file); + mdlog->submit_entry(le); + } + + // hit pop + if (cmode & CEPH_FILE_MODE_WR) + mds->balancer->hit_inode(mdr->get_mds_stamp(), cur, META_POP_IWR); + else + mds->balancer->hit_inode(mdr->get_mds_stamp(), cur, META_POP_IRD, + mdr->client_request->get_source().num()); + + CDentry *dn = 0; + if (req->get_dentry_wanted()) { + 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; + snapid_t follows; +public: + C_MDS_openc_finish(Server *s, MDRequestRef& r, CDentry *d, CInode *ni, snapid_t f) : + ServerLogContext(s, r), dn(d), newi(ni), follows(f) {} + void finish(int r) override { + 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(mdr->get_mds_stamp(), newi, META_POP_IWR); + + server->respond_to_request(mdr, 0); + + assert(g_conf->mds_kill_openc_at != 1); + } +}; + +/* This function takes responsibility for the passed mdr*/ +void Server::handle_client_openc(MDRequestRef& mdr) +{ + MClientRequest *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) { + int r = mdcache->path_traverse(mdr, NULL, NULL, 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; + MDSInternalContextBase *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; + } + } + + set rdlocks, wrlocks, xlocks; + file_layout_t *dir_layout = NULL; + CDentry *dn = rdlock_path_xlock_dentry(mdr, 0, rdlocks, wrlocks, xlocks, + !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(); + rdlocks.insert(&diri->authlock); + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + 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. + 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. + SnapRealm *realm = diri->find_snaprealm(); // use directory's realm; inode isn't attached yet. + snapid_t follows = realm->get_newest_seq(); + + CInode *in = prepare_new_inode(mdr, dn->get_dir(), inodeno_t(req->head.ino), + req->head.args.open.mode | S_IFREG, &layout); + 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(); + if (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; + } + in->inode.rstat.rfiles = 1; + + assert(dn->first == follows+1); + in->first = dn->first; + + // 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); + + // do the open + 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); + + // make sure this inode gets into the journal + le->metablob.add_opened_ino(in->ino()); + LogSegment *ls = mds->mdlog->get_current_segment(); + ls->open_files.push_back(&in->item_open_file); + + C_MDS_openc_finish *fin = new C_MDS_openc_finish(this, mdr, dn, in, follows); + + 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) +{ + MClientRequest *req = mdr->client_request; + client_t client = req->get_source().num(); + set rdlocks, wrlocks, xlocks; + CInode *diri = rdlock_path_pin_ref(mdr, 0, rdlocks, 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; + } + + rdlocks.insert(&diri->filelock); + rdlocks.insert(&diri->dirfragtreelock); + + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + 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; + 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; + dir->encode_dirstat(dirbl, mds->get_nodeid()); + + // 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 (CDir::map_t::iterator p = dir->begin(); p != dir->end(); ++p) + 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; + } + } + assert(in); + + if ((int)(dnbl.length() + dn->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->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; + } + assert(r >= 0); + numfiles++; + + // touch dn + mdcache->lru.lru_touch(dn); + } + + __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(now, 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; +public: + C_MDS_inode_update_finish(Server *s, MDRequestRef& r, CInode *i, + bool sm=false, bool cr=false) : + ServerLogContext(s, r), in(i), truncating_smaller(sm), changed_ranges(cr) { } + void finish(int r) override { + assert(r == 0); + + // apply + in->pop_and_dirty_projected_inode(mdr->ls); + mdr->apply(); + + // notify any clients + if (truncating_smaller && in->inode.is_truncating()) { + get_mds()->locker->issue_truncate(in); + get_mds()->mdcache->truncate_inode(in, mdr->ls); + } + + get_mds()->balancer->hit_inode(mdr->get_mds_stamp(), 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) +{ + MClientRequest *req = mdr->client_request; + set rdlocks, wrlocks, xlocks; + + // get the inode to operate on, and set up any locks needed for that + CInode *cur = rdlock_path_pin_ref(mdr, 0, rdlocks, true); + if (!cur) + return; + + xlocks.insert(&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, rdlocks, wrlocks, xlocks)) { + 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 activated_locks; + list 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; + assert(lock_state->is_waiting(set_lock)); + mdr->more()->flock_was_waiting = true; + mds->locker->drop_locks(mdr.get()); + mdr->drop_local_auth_pins(); + 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) +{ + MClientRequest *req = mdr->client_request; + set rdlocks, wrlocks, xlocks; + + // get the inode to operate on, and set up any locks needed for that + CInode *cur = rdlock_path_pin_ref(mdr, 0, rdlocks, 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. + */ + rdlocks.insert(&cur->flocklock); + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) { + 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) +{ + MClientRequest *req = mdr->client_request; + set rdlocks, wrlocks, xlocks; + CInode *cur = rdlock_path_pin_ref(mdr, 0, rdlocks, 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)) + xlocks.insert(&cur->authlock); + if (mask & (CEPH_SETATTR_MTIME|CEPH_SETATTR_ATIME|CEPH_SETATTR_SIZE)) + xlocks.insert(&cur->filelock); + if (mask & CEPH_SETATTR_CTIME) + wrlocks.insert(&cur->versionlock); + + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + 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? + inode_t *pi = cur->get_projected_inode(); + + uint64_t old_size = MAX(pi->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 && 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; + } + } + + bool changed_ranges = false; + + // project update + mdr->ls = mdlog->get_current_segment(); + EUpdate *le = new EUpdate(mdlog, "setattr"); + mdlog->start_entry(le); + + pi = cur->project_inode(); + + if (mask & CEPH_SETATTR_UID) + pi->uid = req->head.args.setattr.uid; + if (mask & CEPH_SETATTR_GID) + pi->gid = req->head.args.setattr.gid; + + if (mask & CEPH_SETATTR_MODE) + pi->mode = (pi->mode & ~07777) | (req->head.args.setattr.mode & 07777); + else if ((mask & (CEPH_SETATTR_UID|CEPH_SETATTR_GID|CEPH_SETATTR_KILL_SGUID)) && + S_ISREG(pi->mode) && + (pi->mode & (S_IXUSR|S_IXGRP|S_IXOTH))) { + pi->mode &= ~(S_ISUID|S_ISGID); + } + + if (mask & CEPH_SETATTR_MTIME) + pi->mtime = req->head.args.setattr.mtime; + if (mask & CEPH_SETATTR_ATIME) + pi->atime = req->head.args.setattr.atime; + if (mask & CEPH_SETATTR_BTIME) + pi->btime = req->head.args.setattr.btime; + if (mask & (CEPH_SETATTR_ATIME | CEPH_SETATTR_MTIME | CEPH_SETATTR_BTIME)) + pi->time_warp_seq++; // maybe not a timewarp, but still a serialization point. + if (mask & CEPH_SETATTR_SIZE) { + if (truncating_smaller) { + pi->truncate(old_size, req->head.args.setattr.size); + le->metablob.add_truncate_start(cur->ino()); + } else { + pi->size = req->head.args.setattr.size; + pi->rstat.rbytes = pi->size; + } + pi->mtime = mdr->get_op_stamp(); + + // adjust client's max_size? + map new_ranges; + bool max_increased = false; + mds->locker->calc_new_client_ranges(cur, pi->size, &new_ranges, &max_increased); + if (pi->client_ranges != new_ranges) { + dout(10) << " client_ranges " << pi->client_ranges << " -> " << new_ranges << dendl; + pi->client_ranges = new_ranges; + changed_ranges = true; + } + } + + pi->version = cur->pre_dirty(); + pi->ctime = mdr->get_op_stamp(); + pi->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 (xlocks.count(&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(); + assert(in); + + dout(10) << "do_open_truncate " << *in << dendl; + + SnapRealm *realm = in->find_snaprealm(); + 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 + inode_t *pi = in->project_inode(); + pi->version = in->pre_dirty(); + pi->mtime = pi->ctime = mdr->get_op_stamp(); + pi->change_attr++; + + uint64_t old_size = MAX(pi->size, mdr->client_request->head.args.open.old_size); + if (old_size > 0) { + pi->truncate(old_size, 0); + le->metablob.add_truncate_start(in->ino()); + } + + bool changed_ranges = false; + if (cmode & CEPH_FILE_MODE_WR) { + pi->client_ranges[client].range.first = 0; + pi->client_ranges[client].range.last = pi->get_layout_size_increment(); + pi->client_ranges[client].follows = in->find_snaprealm()->get_newest_seq(); + changed_ranges = true; + } + + 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()); + LogSegment *ls = mds->mdlog->get_current_segment(); + ls->open_files.push_back(&in->item_open_file); + + mdr->o_trunc = true; + + CDentry *dn = 0; + if (mdr->client_request->get_dentry_wanted()) { + 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) +{ + MClientRequest *req = mdr->client_request; + set rdlocks, wrlocks, xlocks; + CInode *cur = rdlock_path_pin_ref(mdr, 0, rdlocks, 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; + } + + xlocks.insert(&cur->filelock); + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + return; + + if (!check_access(mdr, cur, access)) + return; + + // project update + inode_t *pi = cur->project_inode(); + pi->layout = layout; + // add the old pool to the inode + pi->add_old_pool(old_layout.pool_id); + pi->version = cur->pre_dirty(); + pi->ctime = mdr->get_op_stamp(); + pi->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) +{ + MClientRequest *req = mdr->client_request; + set rdlocks, wrlocks, xlocks; + file_layout_t *dir_layout = NULL; + CInode *cur = rdlock_path_pin_ref(mdr, 0, rdlocks, 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; + } + + xlocks.insert(&cur->policylock); + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + return; + + // validate layout + const inode_t *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; + + inode_t *pi = cur->project_inode(); + pi->layout = layout; + pi->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); + + 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 p; // create instance of parser + std::map 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::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(value); + } else if (name == "layout.stripe_unit") { + layout->stripe_unit = boost::lexical_cast(value); + } else if (name == "layout.stripe_count") { + layout->stripe_count = boost::lexical_cast(value); + } else if (name == "layout.pool") { + try { + layout->pool_id = boost::lexical_cast(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(); + keys_and_values p; // create instance of parser + std::map 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::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(value); + if (q < 0) + return -EINVAL; + quota->max_bytes = q; + } else if (name == "quota.max_files") { + int64_t q = boost::lexical_cast(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; +} + +/* + * 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) +{ + MClientRequest *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(); + }); + + 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, + set rdlocks, + set wrlocks, + set xlocks) +{ + MClientRequest *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; + + inode_t *pi = NULL; + string rest; + + if (!check_access(mdr, cur, MAY_SET_VXATTR)) { + return; + } + + 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; + + xlocks.insert(&cur->policylock); + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + return; + + pi = cur->project_inode(); + pi->layout = layout; + } 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; + + xlocks.insert(&cur->filelock); + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + return; + + pi = cur->project_inode(); + int64_t old_pool = pi->layout.pool_id; + pi->add_old_pool(old_pool); + pi->layout = layout; + pi->ctime = mdr->get_op_stamp(); + } 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; + } + + xlocks.insert(&cur->policylock); + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + return; + + pi = cur->project_inode(); + pi->quota = quota; + } else if (name.find("ceph.dir.pin") == 0) { + if (!cur->is_dir() || cur->is_root()) { + respond_to_request(mdr, -EINVAL); + return; + } + + mds_rank_t rank; + try { + rank = boost::lexical_cast(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; + } + + xlocks.insert(&cur->policylock); + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + return; + + pi = cur->project_inode(); + cur->set_export_pin(rank); + } else { + dout(10) << " unknown vxattr " << name << dendl; + respond_to_request(mdr, -EINVAL); + return; + } + + pi->change_attr++; + pi->ctime = mdr->get_op_stamp(); + pi->version = cur->pre_dirty(); + if (cur->is_file()) + pi->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)); + return; +} + +void Server::handle_remove_vxattr(MDRequestRef& mdr, CInode *cur, + file_layout_t *dir_layout, + set rdlocks, + set wrlocks, + set xlocks) +{ + MClientRequest *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; + } + + xlocks.insert(&cur->policylock); + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + return; + + inode_t *pi = cur->project_inode(); + pi->clear_layout(); + pi->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); + + 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, rdlocks, wrlocks, xlocks); + 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 { + assert(r == 0); + + // apply + in->pop_and_dirty_projected_inode(mdr->ls); + + mdr->apply(); + + get_mds()->balancer->hit_inode(mdr->get_mds_stamp(), in, META_POP_IWR); + + server->respond_to_request(mdr, 0); + } +}; + +void Server::handle_client_setxattr(MDRequestRef& mdr) +{ + MClientRequest *req = mdr->client_request; + string name(req->get_path2()); + set rdlocks, wrlocks, xlocks; + CInode *cur; + + file_layout_t *dir_layout = NULL; + if (name.compare(0, 15, "ceph.dir.layout") == 0) + cur = rdlock_path_pin_ref(mdr, 0, rdlocks, true, false, &dir_layout); + else + cur = rdlock_path_pin_ref(mdr, 0, rdlocks, 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, rdlocks, wrlocks, xlocks); + return; + } + + xlocks.insert(&cur->xattrlock); + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + return; + + if (!check_access(mdr, cur, MAY_WRITE)) + return; + + map *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(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(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 + map *px = new map; + inode_t *pi = cur->project_inode(px); + pi->version = cur->pre_dirty(); + pi->ctime = mdr->get_op_stamp(); + pi->change_attr++; + pi->xattr_version++; + px->erase(name); + if (!(flags & CEPH_XATTR_REMOVE)) { + (*px)[name] = buffer::create(len); + if (len) + req->get_data().copy(0, len, (*px)[name].c_str()); + } + + // 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) +{ + MClientRequest *req = mdr->client_request; + string name(req->get_path2()); + set rdlocks, wrlocks, xlocks; + file_layout_t *dir_layout = NULL; + CInode *cur; + if (name == "ceph.dir.layout") + cur = rdlock_path_pin_ref(mdr, 0, rdlocks, true, false, &dir_layout); + else + cur = rdlock_path_pin_ref(mdr, 0, rdlocks, 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, rdlocks, wrlocks, xlocks); + return; + } + + xlocks.insert(&cur->xattrlock); + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + return; + + map *pxattrs = cur->get_projected_xattrs(); + if (pxattrs->count(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 + map *px = new map; + inode_t *pi = cur->project_inode(px); + pi->version = cur->pre_dirty(); + pi->ctime = mdr->get_op_stamp(); + pi->change_attr++; + pi->xattr_version++; + px->erase(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 { + 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()); + 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(mdr->get_mds_stamp(), newi, META_POP_IWR); + + // reply + server->respond_to_request(mdr, 0); + } +}; + + +void Server::handle_client_mknod(MDRequestRef& mdr) +{ + MClientRequest *req = mdr->client_request; + client_t client = mdr->get_client(); + set rdlocks, wrlocks, xlocks; + file_layout_t *dir_layout = NULL; + CDentry *dn = rdlock_path_xlock_dentry(mdr, 0, rdlocks, wrlocks, xlocks, 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(); + rdlocks.insert(&diri->authlock); + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + 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; + + SnapRealm *realm = dn->get_dir()->inode->find_snaprealm(); + snapid_t follows = realm->get_newest_seq(); + CInode *newi = prepare_new_inode(mdr, dn->get_dir(), inodeno_t(req->head.ino), + mode, &layout); + 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(); + + // 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)) { + 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; + + // 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); + } + } + + 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)); +} + + + +// MKDIR +/* This function takes responsibility for the passed mdr*/ +void Server::handle_client_mkdir(MDRequestRef& mdr) +{ + MClientRequest *req = mdr->client_request; + set rdlocks, wrlocks, xlocks; + CDentry *dn = rdlock_path_xlock_dentry(mdr, 0, rdlocks, wrlocks, xlocks, 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(); + rdlocks.insert(&diri->authlock); + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + return; + + // mkdir check access + if (!check_access(mdr, diri, MAY_WRITE)) + return; + + if (!check_fragment_space(mdr, dir)) + return; + + // new inode + SnapRealm *realm = dn->get_dir()->inode->find_snaprealm(); + snapid_t follows = realm->get_newest_seq(); + + 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); + 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(); + + dout(12) << " follows " << follows << dendl; + 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()); + LogSegment *ls = mds->mdlog->get_current_segment(); + ls->open_files.push_back(&newi->item_open_file); + + journal_and_reply(mdr, newi, dn, le, new C_MDS_mknod_finish(this, mdr, dn, newi)); +} + + +// SYMLINK + +void Server::handle_client_symlink(MDRequestRef& mdr) +{ + MClientRequest *req = mdr->client_request; + set rdlocks, wrlocks, xlocks; + CDentry *dn = rdlock_path_xlock_dentry(mdr, 0, rdlocks, wrlocks, xlocks, 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(); + rdlocks.insert(&diri->authlock); + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + 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); + 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)); +} + + + + + +// LINK + +void Server::handle_client_link(MDRequestRef& mdr) +{ + MClientRequest *req = mdr->client_request; + + dout(7) << "handle_client_link " << req->get_filepath() + << " to " << req->get_filepath2() + << dendl; + + set rdlocks, wrlocks, xlocks; + + CDentry *dn = rdlock_path_xlock_dentry(mdr, 0, rdlocks, wrlocks, xlocks, false, false, false); + if (!dn) return; + CInode *targeti = rdlock_path_pin_ref(mdr, 1, rdlocks, 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& 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; + } + } + + xlocks.insert(&targeti->linklock); + + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + 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; + } + + // go! + assert(g_conf->mds_kill_link_at != 1); + + // local or remote? + if (targeti->is_auth()) + _link_local(mdr, dn, targeti); + else + _link_remote(mdr, true, dn, targeti); +} + + +class C_MDS_link_local_finish : public ServerLogContext { + CDentry *dn; + CInode *targeti; + version_t dnpv; + version_t tipv; +public: + C_MDS_link_local_finish(Server *s, MDRequestRef& r, CDentry *d, CInode *ti, + version_t dnpv_, version_t tipv_) : + ServerLogContext(s, r), dn(d), targeti(ti), + dnpv(dnpv_), tipv(tipv_) { } + void finish(int r) override { + assert(r == 0); + server->_link_local_finish(mdr, dn, targeti, dnpv, tipv); + } +}; + + +void Server::_link_local(MDRequestRef& mdr, CDentry *dn, CInode *targeti) +{ + 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 + inode_t *pi = targeti->project_inode(); + pi->nlink++; + pi->ctime = mdr->get_op_stamp(); + pi->change_attr++; + pi->version = tipv; + + // 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)); +} + +void Server::_link_local_finish(MDRequestRef& mdr, CDentry *dn, CInode *targeti, + version_t dnpv, version_t tipv) +{ + 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); + + // bump target popularity + mds->balancer->hit_inode(mdr->get_mds_stamp(), targeti, META_POP_IWR); + mds->balancer->hit_dir(mdr->get_mds_stamp(), 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 { + 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; + MMDSSlaveRequest *req = new MMDSSlaveRequest(mdr->reqid, mdr->attempt, op); + targeti->set_object_info(req->get_object_info()); + req->op_stamp = mdr->get_op_stamp(); + mds->send_message_mds(req, linkauth); + + 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; + + assert(g_conf->mds_kill_link_at != 2); + + 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; + + 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(mdr->get_mds_stamp(), targeti, META_POP_IWR); + mds->balancer->hit_dir(mdr->get_mds_stamp(), 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; +public: + C_MDS_SlaveLinkPrep(Server *s, MDRequestRef& r, CInode *t) : + ServerLogContext(s, r), targeti(t) { } + void finish(int r) override { + assert(r == 0); + server->_logged_slave_link(mdr, targeti); + } +}; + +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); + } +}; + +/* This function DOES put the mdr->slave_request before returning*/ +void Server::handle_slave_link_prep(MDRequestRef& mdr) +{ + dout(10) << "handle_slave_link_prep " << *mdr + << " on " << mdr->slave_request->get_object_info() + << dendl; + + assert(g_conf->mds_kill_link_at != 4); + + CInode *targeti = mdcache->get_inode(mdr->slave_request->get_object_info().ino); + assert(targeti); + dout(10) << "targeti " << *targeti << dendl; + CDentry *dn = targeti->get_parent_dn(); + CDentry::linkage_t *dnl = dn->get_linkage(); + 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... + 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); + + inode_t *pi = dnl->get_inode()->project_inode(); + + // update journaled target inode + bool inc; + if (mdr->slave_request->get_op() == MMDSSlaveRequest::OP_LINKPREP) { + inc = true; + pi->nlink++; + } else { + inc = false; + pi->nlink--; + } + + 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; + ::encode(rollback, le->rollback); + mdr->more()->rollback_bl = le->rollback; + + pi->ctime = mdr->get_op_stamp(); + pi->version = targeti->pre_dirty(); + + dout(10) << " projected inode " << pi << " v " << pi->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); + + // 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), + mdr, __func__); + mdlog->flush(); +} + +void Server::_logged_slave_link(MDRequestRef& mdr, CInode *targeti) +{ + dout(10) << "_logged_slave_link " << *mdr + << " " << *targeti << dendl; + + 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(mdr->get_mds_stamp(), targeti, META_POP_IWR); + + // done. + mdr->slave_request->put(); + mdr->slave_request = 0; + + // ack + if (!mdr->aborted) { + MMDSSlaveRequest *reply = new MMDSSlaveRequest(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; + + 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; + + assert(g_conf->mds_kill_link_at != 8); + + MMDSSlaveRequest *req = new MMDSSlaveRequest(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; + C_MDS_LoggedLinkRollback(Server *s, MutationRef& m, MDRequestRef& r) : ServerLogContext(s, r), mut(m) {} + void finish(int r) override { + server->_link_rollback_finish(mut, mdr); + } +}; + +void Server::do_link_rollback(bufferlist &rbl, mds_rank_t master, MDRequestRef& mdr) +{ + link_rollback rollback; + bufferlist::iterator p = rbl.begin(); + ::decode(rollback, p); + + dout(10) << "do_link_rollback on " << rollback.reqid + << (rollback.was_inc ? " inc":" dec") + << " ino " << rollback.ino + << dendl; + + assert(g_conf->mds_kill_link_at != 9); + + mdcache->add_rollback(rollback.reqid, master); // need to finish this update before resolve finishes + 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); + assert(in); + dout(10) << " target is " << *in << dendl; + assert(!in->is_projected()); // live slave request hold versionlock xlock. + + inode_t *pi = in->project_inode(); + pi->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->ctime) { + pf->fragstat.mtime = rollback.old_dir_mtime; + if (pf->rstat.rctime == pi->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->ctime = rollback.old_ctime; + if (rollback.was_inc) + pi->nlink--; + else + pi->nlink++; + + // 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), + mdr, __func__); + mdlog->flush(); +} + +void Server::_link_rollback_finish(MutationRef& mut, MDRequestRef& mdr) +{ + dout(10) << "_link_rollback_finish" << dendl; + + assert(g_conf->mds_kill_link_at != 10); + + mut->apply(); + if (mdr) + mdcache->request_finish(mdr); + + mdcache->finish_rollback(mut->reqid); + + mut->cleanup(); +} + + +/* This function DOES NOT put the passed message before returning*/ +void Server::handle_slave_link_prep_ack(MDRequestRef& mdr, MMDSSlaveRequest *m) +{ + dout(10) << "handle_slave_link_prep_ack " << *mdr + << " " << *m << dendl; + mds_rank_t from = mds_rank_t(m->get_source().num()); + + assert(g_conf->mds_kill_link_at != 11); + + // note slave + mdr->more()->slaves.insert(from); + + // witnessed! + assert(mdr->more()->witnessed.count(from) == 0); + mdr->more()->witnessed.insert(from); + assert(!m->is_not_journaled()); + mdr->more()->has_journaled_slaves = true; + + // remove from waiting list + assert(mdr->more()->waiting_on_slave.count(from)); + mdr->more()->waiting_on_slave.erase(from); + + assert(mdr->more()->waiting_on_slave.empty()); + + dispatch_client_request(mdr); // go again! +} + + + + + +// UNLINK + +void Server::handle_client_unlink(MDRequestRef& mdr) +{ + MClientRequest *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; + + if (req->get_filepath().depth() == 0) { + respond_to_request(mdr, -EINVAL); + return; + } + + // traverse to path + vector trace; + CInode *in; + int r = mdcache->path_traverse(mdr, NULL, NULL, req->get_filepath(), &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(req->get_filepath().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[trace.size()-1]; + 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); + 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 + set rdlocks, wrlocks, xlocks; + + for (int i=0; i<(int)trace.size()-1; i++) + rdlocks.insert(&trace[i]->lock); + xlocks.insert(&dn->lock); + wrlocks.insert(&diri->filelock); + wrlocks.insert(&diri->nestlock); + xlocks.insert(&in->linklock); + if (straydn) { + wrlocks.insert(&straydn->get_dir()->inode->filelock); + wrlocks.insert(&straydn->get_dir()->inode->nestlock); + xlocks.insert(&straydn->lock); + } + if (in->is_dir()) + rdlocks.insert(&in->filelock); // to verify it's empty + mds->locker->include_snap_rdlocks(rdlocks, dnl->get_inode()); + + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + 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; + } + + // yay! + if (in->is_dir() && in->has_subtree_root_dirfrag()) { + // subtree root auths need to be witnesses + set witnesses; + in->list_replicas(witnesses); + dout(10) << " witnesses " << witnesses << ", have " << mdr->more()->witnessed << dendl; + + for (set::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 { + 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(); + + SnapRealm *realm = in->find_snaprealm(); + snapid_t follows = realm->get_newest_seq(); + + // 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) { + assert(dnl->is_primary()); + straydn->push_projected_linkage(in); + straydn->first = follows + 1; + } + + // the unlinked dentry + dn->pre_dirty(); + + inode_t *pi = in->project_inode(); + dn->make_path_string(pi->stray_prior_path, true); + mdr->add_projected_inode(in); // do this _after_ my dn->pre_dirty().. we apply that one manually. + pi->version = in->pre_dirty(); + pi->ctime = mdr->get_op_stamp(); + pi->change_attr++; + pi->nlink--; + if (pi->nlink == 0) + in->state_set(CInode::STATE_ORPHAN); + + if (dnl->is_primary()) { + // primary link. add stray dentry. + assert(straydn); + 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); + + // project snaprealm, too + if (in->snaprealm || follows + 1 > in->get_oldest_snap()) + in->project_past_snaprealm_parent(straydn->get_dir()->inode->find_snaprealm()); + + pi->update_backtrace(); + le->metablob.add_primary_dentry(straydn, in, true, true); + } else { + // 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 (in->is_dir()) { + 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); + + // unlink main dentry + dn->get_dir()->unlink_inode(dn); + dn->pop_projected_linkage(); + + // relink as stray? (i.e. was primary link?) + CInode *strayin = NULL; + bool snap_is_new = false; + if (straydn) { + dout(20) << " straydn is " << *straydn << dendl; + CDentry::linkage_t *straydnl = straydn->pop_projected_linkage(); + strayin = straydnl->get_inode(); + + snap_is_new = strayin->snaprealm ? true : false; + mdcache->touch_dentry_bottom(straydn); + } + + dn->mark_dirty(dnpv, mdr->ls); + mdr->apply(); + + if (snap_is_new) //only new if strayin exists + mdcache->do_realm_invalidate_and_update_notify(strayin, CEPH_SNAP_OP_SPLIT, true); + + mdcache->send_dentry_unlink(dn, straydn, mdr); + + // update subtree map? + if (straydn && strayin->is_dir()) + mdcache->adjust_subtree_after_rename(strayin, dn->get_dir(), true); + + // bump pop + mds->balancer->hit_dir(mdr->get_mds_stamp(), 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& 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; + MMDSSlaveRequest *req = new MMDSSlaveRequest(mdr->reqid, mdr->attempt, + MMDSSlaveRequest::OP_RMDIRPREP); + req->srcdnpath = filepath(trace.front()->get_dir()->ino()); + for (auto dn : trace) + req->srcdnpath.push_dentry(dn->name); + mdcache->replicate_stray(straydn, who, req->stray); + + req->op_stamp = mdr->get_op_stamp(); + mds->send_message_mds(req, who); + + 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 trace; + filepath srcpath(mdr->slave_request->srcdnpath); + dout(10) << " src " << srcpath << dendl; + CInode *in; + int r = mdcache->path_traverse(mdr, NULL, NULL, 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; + } + assert(r == 0); + CDentry *dn = trace[trace.size()-1]; + dout(10) << " dn " << *dn << dendl; + mdr->pin(dn); + + 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->name; + rollback.dest_dir = straydn->get_dir()->dirfrag(); + rollback.dest_dname = straydn->name; + ::encode(rollback, mdr->more()->rollback_bl); + 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); + + if (!in->has_subtree_root_dirfrag(mds->get_nodeid())) { + dout(10) << " no auth subtree in " << *in << ", skipping journal" << dendl; + dn->get_dir()->unlink_inode(dn); + straydn->get_dir()->link_primary_inode(straydn, in); + + assert(straydn->first >= in->first); + in->first = straydn->first; + + mdcache->adjust_subtree_after_rename(in, dn->get_dir(), false); + + MMDSSlaveRequest *reply = new MMDSSlaveRequest(mdr->reqid, mdr->attempt, + MMDSSlaveRequest::OP_RMDIRPREPACK); + reply->mark_not_journaled(); + mds->send_message_mds(reply, mdr->slave_to_mds); + + // send caps to auth (if we're not already) + if (in->is_any_caps() && !in->state_test(CInode::STATE_EXPORTINGCAPS)) + mdcache->migrator->export_caps(in); + + mdcache->touch_dentry_bottom(straydn); // move stray to end of lru + + mdr->slave_request->put(); + mdr->slave_request = 0; + mdr->straydn = 0; + return; + } + + straydn->push_projected_linkage(in); + dn->push_projected_linkage(); + + 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()); + + 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; + + // update our cache now, so we are consistent with what is in the journal + // when we journal a subtree map + CInode *in = dn->get_linkage()->get_inode(); + dn->get_dir()->unlink_inode(dn); + straydn->pop_projected_linkage(); + dn->pop_projected_linkage(); + mdcache->adjust_subtree_after_rename(in, dn->get_dir(), true); + + // done. + mdr->slave_request->put(); + mdr->slave_request = 0; + mdr->straydn = 0; + + if (!mdr->aborted) { + MMDSSlaveRequest *reply = new MMDSSlaveRequest(mdr->reqid, mdr->attempt, + MMDSSlaveRequest::OP_RMDIRPREPACK); + 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, MMDSSlaveRequest *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 + 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; + bufferlist::iterator p = rbl.begin(); + ::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 + 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); + assert(dir); + CDentry *dn = dir->lookup(rollback.src_dname); + assert(dn); + dout(10) << " dn " << *dn << dendl; + dir = mdcache->get_dirfrag(rollback.dest_dir); + assert(dir); + CDentry *straydn = dir->lookup(rollback.dest_dname); + assert(straydn); + dout(10) << " straydn " << *dn << dendl; + CInode *in = straydn->get_linkage()->get_inode(); + + if (mdr && !mdr->more()->slave_update_journaled) { + assert(!in->has_subtree_root_dirfrag(mds->get_nodeid())); + + straydn->get_dir()->unlink_inode(straydn); + dn->get_dir()->link_primary_inode(dn, in); + + mdcache->adjust_subtree_after_rename(in, straydn->get_dir(), false); + + mdcache->request_finish(mdr); + mdcache->finish_rollback(rollback.reqid); + return; + } + + dn->push_projected_linkage(in); + straydn->push_projected_linkage(); + + 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(), true); + 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); +} + + +/** _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; + assert(in->is_auth()); + + if (in->snaprealm && in->snaprealm->srnode.snaps.size()) + return true; // in a snapshot! + + list ls; + in->get_dirfrags(ls); + for (list::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; + assert(in->is_auth()); + assert(in->filelock.can_read(mdr->get_client())); + + frag_info_t dirstat; + version_t dirstat_version = in->get_projected_inode()->dirstat.version; + + list ls; + in->get_dirfrags(ls); + for (list::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 { + 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) +{ + MClientRequest *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; + } + const string &destname = destpath.last_dentry(); + + vector& srctrace = mdr->dn[1]; + vector& desttrace = mdr->dn[0]; + + set rdlocks, wrlocks, xlocks; + + CDentry *destdn = rdlock_path_xlock_dentry(mdr, 0, rdlocks, wrlocks, xlocks, 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(); + assert(destdir->is_auth()); + + int r = mdcache->path_traverse(mdr, NULL, NULL, 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; + + } + assert(!srctrace.empty()); + CDentry *srcdn = srctrace[srctrace.size()-1]; + dout(10) << " srcdn " << *srcdn << dendl; + if (srcdn->last != CEPH_NOSNAP) { + respond_to_request(mdr, -EROFS); + return; + } + 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 && !srcdn->get_dir()->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); + rdlocks.insert(&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 (srcdn->get_dir() == destdir && srcdn->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() && + (srcdnl->is_primary() || destdnl->is_primary())); + 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 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 -- + map remote_wrlocks; + + // srctrace items. this mirrors locks taken in rdlock_path_xlock_dentry + for (int i=0; i<(int)srctrace.size(); i++) + rdlocks.insert(&srctrace[i]->lock); + xlocks.insert(&srcdn->lock); + mds_rank_t srcdirauth = srcdn->get_dir()->authority().first; + if (srcdirauth != mds->get_nodeid()) { + dout(10) << " will remote_wrlock srcdir scatterlocks on mds." << srcdirauth << dendl; + remote_wrlocks[&srcdn->get_dir()->inode->filelock] = srcdirauth; + remote_wrlocks[&srcdn->get_dir()->inode->nestlock] = srcdirauth; + if (srci->is_dir()) + rdlocks.insert(&srci->dirfragtreelock); + } else { + wrlocks.insert(&srcdn->get_dir()->inode->filelock); + wrlocks.insert(&srcdn->get_dir()->inode->nestlock); + } + mds->locker->include_snap_rdlocks(rdlocks, srcdn->get_dir()->inode); + + // straydn? + if (straydn) { + wrlocks.insert(&straydn->get_dir()->inode->filelock); + wrlocks.insert(&straydn->get_dir()->inode->nestlock); + xlocks.insert(&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()) + xlocks.insert(&srctrace[i]->versionlock); + } + for (int i=0; i<(int)desttrace.size(); i++) { + if (desttrace[i]->is_auth() && desttrace[i]->is_projected()) + xlocks.insert(&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()) + xlocks.insert(&srci->get_projected_parent_dn()->lock); + if (destdnl->is_remote()) + xlocks.insert(&oldin->get_projected_parent_dn()->lock); + } + + // we need to update srci's ctime. xlock its least contended lock to do that... + xlocks.insert(&srci->linklock); + + // xlock oldin (for nlink--) + if (oldin) { + xlocks.insert(&oldin->linklock); + if (oldin->is_dir()) + rdlocks.insert(&oldin->filelock); + } + if (srcdnl->is_primary() && srci->is_dir()) + // FIXME: this should happen whenever we are renamning between + // realms, regardless of the file type + // FIXME: If/when this changes, make sure to update the + // "allowance" in handle_slave_rename_prep + xlocks.insert(&srci->snaplock); // FIXME: an auth bcast could be sufficient? + else + rdlocks.insert(&srci->snaplock); + + CInode *auth_pin_freeze = !srcdn->is_auth() && srcdnl->is_primary() ? srci : NULL; + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks, + &remote_wrlocks, auth_pin_freeze)) + return; + + if ((!mdr->has_more() || mdr->more()->witnessed.empty())) { + if (!check_access(mdr, srcdn->get_dir()->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_past_snaprealm_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; + } + } + */ + + 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); + + list frags; + srci->dirfragtree.get_leaves(frags); + for (list::iterator p = frags.begin(); + p != frags.end(); + ++p) { + CDir *dir = srci->get_dirfrag(*p); + if (!dir) { + dout(10) << " opening " << *p << " under " << *srci << dendl; + mdcache->open_remote_dirfrag(srci, *p, new C_MDS_RetryRequest(mdcache, mdr)); + return; + } + } + } + + // -- 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; + assert(mdr->more()->is_remote_frozen_authpin); + assert(mdr->more()->rename_inode == srci); + _rename_prepare_witness(mdr, last, witnesses, srctrace, desttrace, straydn); + return; + } + } + + for (set::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; + 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()) + assert(g_conf->mds_kill_rename_at != 3); + if (!mdr->more()->slaves.empty() && srci->is_dir()) + 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); +} + + +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()) + assert(g_conf->mds_kill_rename_at != 5); + if (!mdr->more()->slaves.empty() && in->is_dir()) + assert(g_conf->mds_kill_rename_at != 6); + + // bump popularity + mds->balancer->hit_dir(mdr->get_mds_stamp(), srcdn->get_dir(), META_POP_IWR); + if (destdnl->is_remote() && in->is_auth()) + mds->balancer->hit_inode(mdr->get_mds_stamp(), in, META_POP_IWR); + + // did we import srci? if so, explicitly ack that import that, before we unlock and reply. + + 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 &witnesse, + vector& srctrace, vector& 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; + MMDSSlaveRequest *req = new MMDSSlaveRequest(mdr->reqid, mdr->attempt, + MMDSSlaveRequest::OP_RENAMEPREP); + + req->srcdnpath = filepath(srctrace.front()->get_dir()->ino()); + for (auto dn : srctrace) + req->srcdnpath.push_dentry(dn->name); + req->destdnpath = filepath(dsttrace.front()->get_dir()->ino()); + for (auto dn : dsttrace) + req->destdnpath.push_dentry(dn->name); + if (straydn) + mdcache->replicate_stray(straydn, who, req->stray); + + 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); + + 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 */ + bufferlist::iterator blp = mdr->more()->inode_import.begin(); + + // imported caps + ::decode(mdr->more()->imported_client_map, blp); + ::encode(mdr->more()->imported_client_map, *client_map_bl, + mds->mdsmap->get_up_features()); + prepare_force_open_sessions(mdr->more()->imported_client_map, mdr->more()->sseq_map); + + list 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) +{ + list ls; + diri->get_dirfrags(ls); + + bool force_journal = false; + if (empty) { + for (list::iterator p = ls.begin(); p != ls.end(); ++p) { + if ((*p)->is_subtree_root() && (*p)->get_dir_auth().first == mds->get_nodeid()) { + dout(10) << " frag " << (*p)->get_frag() << " is auth subtree dirfrag, will force journal" << dendl; + force_journal = true; + break; + } else + dout(20) << " frag " << (*p)->get_frag() << " is not auth subtree dirfrag" << dendl; + } + } else { + // see if any children of our frags are auth subtrees. + list subtrees; + mdcache->list_subtrees(subtrees); + dout(10) << " subtrees " << subtrees << " frags " << ls << dendl; + for (list::iterator p = ls.begin(); p != ls.end(); ++p) { + CDir *dir = *p; + for (list::iterator q = subtrees.begin(); q != subtrees.end(); ++q) { + if (dir->contains(*q)) { + if ((*q)->get_dir_auth().first == mds->get_nodeid()) { + dout(10) << " frag " << (*p)->get_frag() << " contains (maybe) auth subtree, will force journal " + << **q << dendl; + force_journal = true; + break; + } else + dout(20) << " frag " << (*p)->get_frag() << " contains but isn't auth for " << **q << dendl; + } else + dout(20) << " frag " << (*p)->get_frag() << " does not contain " << **q << 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 == destdnl->get_inode() && + (srcdnl->is_primary() || destdnl->is_primary())); + 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 + inode_t *pi = 0; // renamed inode + inode_t *tpi = 0; // target/overwritten inode + + // target inode + if (!linkmerge) { + if (destdnl->is_primary()) { + assert(straydn); // moving to straydn. + // link--, and move. + if (destdn->is_auth()) { + tpi = oldin->project_inode(); //project_snaprealm + tpi->version = straydn->pre_dirty(tpi->version); + tpi->update_backtrace(); + } + straydn->push_projected_linkage(oldin); + } else if (destdnl->is_remote()) { + // nlink-- targeti + if (oldin->is_auth()) { + tpi = oldin->project_inode(); + tpi->version = oldin->pre_dirty(); + } + } + } + + // 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()) { + pi = srci->project_inode(); + pi->version = srci->pre_dirty(); + } + } else { + dout(10) << " will merge remote onto primary link" << dendl; + if (destdn->is_auth()) { + pi = oldin->project_inode(); + pi->version = mdr->more()->pvmap[destdn] = destdn->pre_dirty(oldin->inode.version); + } + } + } 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 ls; + srci->get_dirfrags(ls); + for (list::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; + } + } + pi = srci->project_inode(); // project snaprealm if srcdnl->is_primary + // & srcdnl->snaprealm + pi->version = mdr->more()->pvmap[destdn] = destdn->pre_dirty(oldpv); + pi->update_backtrace(); + } + 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 (pi) { + pi->ctime = mdr->get_op_stamp(); + pi->change_attr++; + if (linkmerge) + pi->nlink--; + } + if (tpi) { + tpi->ctime = mdr->get_op_stamp(); + tpi->change_attr++; + destdn->make_path_string(tpi->stray_prior_path, true); + 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()) { + 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()) { + 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); + + SnapRealm *src_realm = srci->find_snaprealm(); + SnapRealm *dest_realm = destdn->get_dir()->inode->find_snaprealm(); + snapid_t next_dest_snap = dest_realm->get_newest_seq() + 1; + + // add it all to the metablob + // target inode + if (!linkmerge) { + if (destdnl->is_primary()) { + assert(straydn); + if (destdn->is_auth()) { + // project snaprealm, too + if (oldin->snaprealm || dest_realm->get_newest_seq() + 1 > oldin->get_oldest_snap()) + oldin->project_past_snaprealm_parent(straydn->get_dir()->inode->find_snaprealm()); + straydn->first = MAX(oldin->first, next_dest_snap); + 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()) { + // 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()) { + if (!linkmerge) { + if (destdn->is_auth() && !destdnl->is_null()) + mdcache->journal_cow_dentry(mdr.get(), metablob, destdn, CEPH_NOSNAP, 0, destdnl); + else + destdn->first = MAX(destdn->first, next_dest_snap); + + if (destdn->is_auth()) + metablob->add_remote_dentry(destdn, true, srcdnl->get_remote_ino(), srcdnl->get_remote_d_type()); + if (srci->get_projected_parent_dn()->is_auth()) { // it's remote + metablob->add_dir_context(srci->get_projected_parent_dir()); + mdcache->journal_cow_dentry(mdr.get(), metablob, srci->get_projected_parent_dn(), CEPH_NOSNAP, 0, srcdnl); + metablob->add_primary_dentry(srci->get_projected_parent_dn(), srci, true); + } + } else { + if (destdn->is_auth() && !destdnl->is_null()) + mdcache->journal_cow_dentry(mdr.get(), metablob, destdn, CEPH_NOSNAP, 0, destdnl); + else + destdn->first = MAX(destdn->first, next_dest_snap); + + if (destdn->is_auth()) + metablob->add_primary_dentry(destdn, destdnl->get_inode(), true, true); + } + } else if (srcdnl->is_primary()) { + // project snap parent update? + if (destdn->is_auth() && src_realm != dest_realm && + (srci->snaprealm || src_realm->get_newest_seq() + 1 > srci->get_oldest_snap())) + srci->project_past_snaprealm_parent(dest_realm); + + if (destdn->is_auth() && !destdnl->is_null()) + mdcache->journal_cow_dentry(mdr.get(), metablob, destdn, CEPH_NOSNAP, 0, destdnl); + else + destdn->first = MAX(destdn->first, next_dest_snap); + + 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 ls; + srci->get_dirfrags(ls); + for (list::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()) + srci->first = destdn->first; + + if (oldin && oldin->is_dir()) { + 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() == destdnl->get_inode() && + (srcdnl->is_primary() || destdnl->is_primary())); + + // target inode + if (!linkmerge) { + if (destdnl->is_primary()) { + assert(straydn); + dout(10) << "straydn is " << *straydn << dendl; + destdn->get_dir()->unlink_inode(destdn, false); + + straydn->pop_projected_linkage(); + if (mdr->is_slave() && !mdr->more()->slave_update_journaled) + assert(!straydn->is_projected()); // no other projected + + mdcache->touch_dentry_bottom(straydn); // drop dn as quickly as possible. + + // nlink-- targeti + if (destdn->is_auth()) { + bool hadrealm = (oldin->snaprealm ? true : false); + oldin->pop_and_dirty_projected_inode(mdr->ls); + if (oldin->snaprealm && !hadrealm) + mdcache->do_realm_invalidate_and_update_notify(oldin, CEPH_SNAP_OP_SPLIT); + } else { + // FIXME this snaprealm is not filled out correctly + //oldin->open_snaprealm(); might be sufficient.. + } + } else if (destdnl->is_remote()) { + destdn->get_dir()->unlink_inode(destdn, false); + if (oldin->is_auth()) + oldin->pop_and_dirty_projected_inode(mdr->ls); + } + } + + // unlink src before we relink it at dest + CInode *in = srcdnl->get_inode(); + assert(in); + + bool srcdn_was_remote = srcdnl->is_remote(); + 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) + 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 { + 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) + assert(!destdn->is_projected()); // no other projected + + // srcdn inode import? + if (!srcdn->is_auth() && destdn->is_auth()) { + assert(mdr->more()->inode_import.length() > 0); + + map imported_caps; + + // finish cap imports + finish_force_open_sessions(mdr->more()->imported_client_map, mdr->more()->sseq_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()->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 (set::iterator i = mdr->xlocks.begin(); + i != mdr->xlocks.end(); + ++i) + if ((*i)->get_parent() == destdnl->get_inode() && + !(*i)->is_locallock()) + mds->locker->xlock_import(*i); + + // 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); + + } else { + // FIXME: fix up snaprealm! + } + } + + // 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) + 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); + + // 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); + } +}; + +/* This function DOES put the mdr->slave_request before returning*/ +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; + MMDSSlaveRequest *reply= new MMDSSlaveRequest(mdr->reqid, mdr->attempt, MMDSSlaveRequest::OP_RENAMEPREPACK); + reply->mark_interrupted(); + mds->send_message_mds(reply, mdr->slave_to_mds); + mdr->slave_request->put(); + mdr->slave_request = 0; + return; + } + + // discover destdn + filepath destpath(mdr->slave_request->destdnpath); + dout(10) << " dest " << destpath << dendl; + vector trace; + int r = mdcache->path_traverse(mdr, NULL, NULL, 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; + } + assert(r == 0); // we shouldn't get an error here! + + CDentry *destdn = trace[trace.size()-1]; + 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, NULL, NULL, srcpath, &trace, &srci, MDS_TRAVERSE_DISCOVERXLOCK); + if (r > 0) return; + assert(r == 0); + + // srcpath must not point to a null dentry + assert(srci != nullptr); + + CDentry *srcdn = trace[trace.size()-1]; + 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() && + (srcdnl->is_primary() || destdnl->is_primary())); + CDentry *straydn = mdr->straydn; + if (destdnl->is_primary() && !linkmerge) + 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 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 = 2; // 1 for the mdr auth_pin, 1 for the link lock + allowance += srcdnl->get_inode()->is_dir(); // 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::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; + MMDSSlaveRequest *notify = new MMDSSlaveRequest(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 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::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) { + assert(!srcdnrep.empty()); + MMDSSlaveRequest *reply = new MMDSSlaveRequest(mdr->reqid, mdr->attempt, + MMDSSlaveRequest::OP_RENAMEPREPACK); + reply->witnesses.swap(srcdnrep); + mds->send_message_mds(reply, mdr->slave_to_mds); + mdr->slave_request->put(); + mdr->slave_request = 0; + 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->name; + if (srcdnl->is_primary()) + rollback.orig_src.ino = srcdnl->get_inode()->ino(); + else { + 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->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->name; + } + ::encode(rollback, mdr->more()->rollback_bl); + 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 { + 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 *reply = NULL; + if (!mdr->aborted) { + reply= new MMDSSlaveRequest(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 *destdnl = NULL; + //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() + list bounds; + if (srcdnl->get_inode()->is_dir()) { + srcdnl->get_inode()->get_dirfrags(bounds); + for (list::iterator p = bounds.begin(); p != bounds.end(); ++p) + (*p)->state_set(CDir::STATE_EXPORTBOUND); + } + + map exported_client_map; + bufferlist inodebl; + mdcache->migrator->encode_export_inode(srcdnl->get_inode(), inodebl, + exported_client_map); + + for (list::iterator p = bounds.begin(); p != bounds.end(); ++p) + (*p)->state_clear(CDir::STATE_EXPORTBOUND); + + if (reply) { + ::encode(exported_client_map, reply->inode_export, mds->mdsmap->get_up_features()); + 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); + + destdnl = destdn->get_linkage(); + + // bump popularity + mds->balancer->hit_dir(mdr->get_mds_stamp(), srcdn->get_dir(), META_POP_IWR); + if (destdnl->get_inode() && destdnl->get_inode()->is_auth()) + mds->balancer->hit_inode(mdr->get_mds_stamp(), destdnl->get_inode(), + META_POP_IWR); + + // done. + mdr->slave_request->put(); + mdr->slave_request = 0; + mdr->straydn = 0; + + if (reply) { + mds->send_message_mds(reply, mdr->slave_to_mds); + } else { + 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; + + CDentry::linkage_t *destdnl = destdn->get_linkage(); + + list finished; + if (r == 0) { + // unfreeze+singleauth inode + // hmm, do i really need to delay this? + if (mdr->more()->is_inode_exporter) { + + CInode *in = destdnl->get_inode(); + + // drop our pins + // we exported, clear out any xlocks that we moved to another MDS + set::iterator i = mdr->xlocks.begin(); + while (i != mdr->xlocks.end()) { + SimpleLock *lock = *i++; + + // we only care about xlocks on the exported inode + if (lock->get_parent() == in && + !lock->is_locallock()) + mds->locker->xlock_export(lock, mdr.get()); + } + + map peer_imported; + bufferlist::iterator bp = mdr->more()->inode_import.begin(); + ::decode(peer_imported, bp); + + dout(10) << " finishing inode export on " << *destdnl->get_inode() << dendl; + mdcache->migrator->finish_export_inode(destdnl->get_inode(), + mdr->get_mds_stamp(), + mdr->slave_to_mds, peer_imported, finished); + mds->queue_waiters(finished); // this includes SINGLEAUTH waiters. + + // unfreeze + assert(destdnl->get_inode()->is_frozen_inode()); + destdnl->get_inode()->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 " << *destdnl->get_inode() << dendl; + destdnl->get_inode()->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); + } + } +} + +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.rsnaprealms += linkunlink * rstat.rsnaprealms; + } + 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; + bool finish_mdr; + C_MDS_LoggedRenameRollback(Server *s, MutationRef& m, MDRequestRef& r, + CDentry *sd, version_t pv, CDentry *dd, + CDentry *st, bool f) : + ServerLogContext(s, r), mut(m), srcdn(sd), srcdnpv(pv), destdn(dd), + straydn(st), finish_mdr(f) {} + void finish(int r) override { + server->_rename_rollback_finish(mut, mdr, srcdn, srcdnpv, + destdn, straydn, finish_mdr); + } +}; + +void Server::do_rename_rollback(bufferlist &rbl, mds_rank_t master, MDRequestRef& mdr, + bool finish_mdr) +{ + rename_rollback rollback; + bufferlist::iterator p = rbl.begin(); + ::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; + 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()) + 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; + 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) + 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 + assert(!destdn || destdn->authority().first != whoami); + 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) { + assert(in); + srcdn->push_projected_linkage(in); + } else + srcdn->push_projected_linkage(rollback.orig_src.remote_ino, + rollback.orig_src.remote_d_type); + } + + inode_t *pi = 0; + if (in) { + if (in->authority().first == whoami) { + pi = in->project_inode(); + mut->add_projected_inode(in); + pi->version = in->pre_dirty(); + } else + pi = in->get_projected_inode(); + if (pi->ctime == rollback.ctime) + pi->ctime = rollback.orig_src.old_ctime; + } + + 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, pi ? pi->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) + assert(mds->is_resolve()); + destdn->push_projected_linkage(); + } + } + + if (straydn) + straydn->push_projected_linkage(); + + if (target) { + inode_t *ti = NULL; + if (target->authority().first == whoami) { + ti = target->project_inode(); + mut->add_projected_inode(target); + ti->version = target->pre_dirty(); + } else + ti = target->get_projected_inode(); + 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)) + assert(!rollback.orig_dest.ino && !rollback.orig_dest.remote_ino); + else + assert(rollback.orig_dest.remote_ino && + rollback.orig_dest.remote_ino == rollback.orig_src.ino); + } else + ti->nlink++; + } + + 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) { + 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) { + 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 ls; + in->get_dirfrags(ls); + for (list::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()) { + assert(destdn); + mdcache->project_subtree_rename(target, straydir, destdir); + } + + if (in && in->is_dir()) { + assert(srcdn); + mdcache->project_subtree_rename(in, destdir, srcdir); + } + + if (mdr && !mdr->more()->slave_update_journaled) { + assert(le->commit.empty()); + mdlog->cancel_entry(le); + mut->ls = NULL; + _rename_rollback_finish(mut, mdr, srcdn, srcdnpv, destdn, straydn, finish_mdr); + } else { + 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, 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, 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); + } + + mut->apply(); + + if (srcdn && srcdn->get_linkage()->is_primary()) { + CInode *in = srcdn->get_linkage()->get_inode(); + if (srcdn->authority().first == mds->get_nodeid()) + in->state_set(CInode::STATE_AUTH); + // update subtree map? + if (in && in->is_dir()) { + 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()) { + 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); + } + + if (mdr) { + list 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); + + mut->cleanup(); +} + +/* This function DOES put the passed message before returning*/ +void Server::handle_slave_rename_prep_ack(MDRequestRef& mdr, MMDSSlaveRequest *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? + 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.swap(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.claim(ack->inode_export); + mdr->more()->inode_import_v = ack->inode_export_v; + } + + // remove from waiting list + 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, MMDSSlaveRequest *ack) +{ + dout(10) << "handle_slave_rename_notify_ack " << *mdr << " from mds." + << ack->get_source() << dendl; + 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) +{ + MClientRequest *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 + set rdlocks, wrlocks, xlocks; + mds->locker->include_snap_rdlocks(rdlocks, diri); + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + return; + + if (!check_access(mdr, diri, MAY_READ)) + return; + + SnapRealm *realm = diri->find_snaprealm(); + map 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()); + + bufferlist dirbl; + encode_empty_dirstat(dirbl); + + max_bytes -= dirbl.length() - sizeof(__u32) + sizeof(__u8) * 2; + + __u32 num = 0; + bufferlist dnbl; + map::iterator 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); + encode_infinite_lease(dnbl); + + 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) +{ + if (!mds->mdsmap->allows_snaps()) { + // you can't make snapshots until you set an option right now + respond_to_request(mdr, -EPERM); + return; + } + + MClientRequest *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; + } + + // 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; + } + + const string &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 + set rdlocks, wrlocks, xlocks; + + mds->locker->include_snap_rdlocks(rdlocks, diri); + rdlocks.erase(&diri->snaplock); + xlocks.insert(&diri->snaplock); + + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + return; + + if (!check_access(mdr, diri, MAY_WRITE)) + 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; + bufferlist::iterator p = mdr->more()->snapidbl.begin(); + ::decode(snapid, p); + dout(10) << " stid " << stid << " snapid " << snapid << dendl; + + // journal + SnapInfo info; + info.ino = diri->ino(); + info.snapid = snapid; + info.name = snapname; + info.stamp = mdr->get_op_stamp(); + + inode_t *pi = diri->project_inode(); + pi->ctime = info.stamp; + pi->version = diri->pre_dirty(); + + // project the snaprealm + sr_t *newsnap = diri->project_snaprealm(snapid); + newsnap->snaps[snapid] = 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; + + 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) +{ + MClientRequest *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; + } + + const string &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; + + set rdlocks, wrlocks, xlocks; + mds->locker->include_snap_rdlocks(rdlocks, diri); + rdlocks.erase(&diri->snaplock); + xlocks.insert(&diri->snaplock); + + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + return; + + if (!check_access(mdr, diri, MAY_WRITE)) + 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; + bufferlist::iterator p = mdr->more()->snapidbl.begin(); + snapid_t seq; + ::decode(seq, p); + dout(10) << " stid is " << stid << ", seq is " << seq << dendl; + + // journal + inode_t *pi = diri->project_inode(); + pi->version = diri->pre_dirty(); + pi->ctime = mdr->get_op_stamp(); + + mdr->ls = mdlog->get_current_segment(); + EUpdate *le = new EUpdate(mdlog, "rmsnap"); + mdlog->start_entry(le); + + // project the snaprealm + sr_t *newnode = diri->project_snaprealm(); + 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; + bufferlist::iterator p = mdr->more()->snapidbl.begin(); + 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; + + 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) +{ + MClientRequest *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; + } + + const string &dstname = req->get_filepath().last_dentry(); + const string &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 + set rdlocks, wrlocks, xlocks; + + mds->locker->include_snap_rdlocks(rdlocks, diri); + rdlocks.erase(&diri->snaplock); + xlocks.insert(&diri->snaplock); + + if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks)) + return; + + if (!check_access(mdr, diri, MAY_WRITE)) + return; + + // prepare + if (!mdr->more()->stid) { + mds->snapclient->prepare_update(diri->ino(), snapid, dstname, utime_t(), + &mdr->more()->stid, &mdr->more()->snapidbl, + new C_MDS_RetryRequest(mdcache, mdr)); + return; + } + + version_t stid = mdr->more()->stid; + bufferlist::iterator p = mdr->more()->snapidbl.begin(); + snapid_t seq; + ::decode(seq, p); + dout(10) << " stid is " << stid << ", seq is " << seq << dendl; + + // journal + inode_t *pi = diri->project_inode(); + pi->ctime = mdr->get_op_stamp(); + pi->version = diri->pre_dirty(); + + // project the snaprealm + sr_t *newsnap = diri->project_snaprealm(); + assert(newsnap->snaps.count(snapid)); + newsnap->snaps[snapid].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; + + mdcache->do_realm_invalidate_and_update_notify(diri, CEPH_SNAP_OP_UPDATE, true); + + // 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(); +}