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Server.cc
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Server.cc
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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include <boost/lexical_cast.hpp>
#include "include/assert.h" // lexical_cast includes system assert.h
#include <boost/config/warning_disable.hpp>
#include <boost/fusion/include/std_pair.hpp>
#include "MDSRank.h"
#include "Server.h"
#include "Locker.h"
#include "MDCache.h"
#include "MDLog.h"
#include "Migrator.h"
#include "MDBalancer.h"
#include "InoTable.h"
#include "SnapClient.h"
#include "Mutation.h"
#include "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 <errno.h>
#include <fcntl.h>
#include <list>
#include <iostream>
using namespace std;
#include "common/config.h"
#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()
{
return server->mds;
}
public:
explicit ServerContext(Server *s) : server(s) {
assert(server != NULL);
}
};
class ServerLogContext : public MDSLogContextBase {
protected:
Server *server;
MDSRank *get_mds()
{
return server->mds;
}
MDRequestRef mdr;
void pre_finish(int r) {
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");
plb.add_u64_counter(l_mdss_handle_slave_request, "handle_slave_request",
"Slave requests", "hsr");
plb.add_u64_counter(l_mdss_handle_client_session, "handle_client_session",
"Client session messages", "hcs");
plb.add_u64_counter(l_mdss_dispatch_client_request, "dispatch_client_request", "Client requests dispatched");
plb.add_u64_counter(l_mdss_dispatch_slave_request, "dispatch_server_request", "Server requests dispatched");
logger = plb.create_perf_counters();
g_ceph_context->get_perfcounters_collection()->add(logger);
}
Server::Server(MDSRank *m) :
mds(m),
mdcache(mds->mdcache), mdlog(mds->mdlog),
logger(0),
is_full(false),
reconnect_done(NULL),
failed_reconnects(0),
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<MClientReconnect*>(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<MClientRequest*>(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) {
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<MClientSession*>(m))->get_op() != CEPH_SESSION_REQUEST_CLOSE)) {
wait_for_active = false;
} else if (m->get_type() == CEPH_MSG_CLIENT_REQUEST) {
MClientRequest *req = static_cast<MClientRequest*>(m);
if (req->is_replay()) {
wait_for_active = false;
} else {
Session *session = get_session(req);
if (session && session->have_completed_request(req->get_reqid().tid, NULL))
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<MClientSession*>(m));
return;
case CEPH_MSG_CLIENT_REQUEST:
handle_client_request(static_cast<MClientRequest*>(m));
return;
case MSG_MDS_SLAVE_REQUEST:
handle_slave_request(static_cast<MMDSSlaveRequest*>(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<inodeno_t> inos;
version_t inotablev;
Context *fin;
public:
C_MDS_session_finish(Server *srv, Session *se, uint64_t sseq, bool s, version_t mv, Context *fin_ = NULL) :
ServerLogContext(srv), session(se), state_seq(sseq), open(s), cmapv(mv), inotablev(0), fin(fin_) { }
C_MDS_session_finish(Server *srv, Session *se, uint64_t sseq, bool s, version_t mv, interval_set<inodeno_t>& i, version_t iv, Context *fin_ = NULL) :
ServerLogContext(srv), session(se), state_seq(sseq), open(s), cmapv(mv), inos(i), inotablev(iv), fin(fin_) { }
void finish(int r) {
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<Session *>(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;
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;
m->put();
return;
}
assert(session->is_closed() ||
session->is_closing());
session->set_client_metadata(m->client_meta);
dout(20) << __func__ << " CEPH_SESSION_REQUEST_OPEN "
<< session->info.client_metadata.size() << " metadata entries:" << dendl;
for (map<string, string>::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;
default:
ceph_abort();
}
m->put();
}
void Server::flush_client_sessions(set<client_t>& client_set, MDSGatherBuilder& gather)
{
for (set<client_t>::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<MDSInternalContextBase*> finished;
session->finish_flush(seq, finished);
mds->queue_waiters(finished);
}
void Server::_session_logged(Session *session, uint64_t state_seq, bool open, version_t pv,
interval_set<inodeno_t>& inos, version_t piv)
{
dout(10) << "_session_logged " << session->info.inst << " state_seq " << state_seq << " " << (open ? "open":"close")
<< " " << pv << dendl;
mds->sessionmap.mark_dirty(session);
if (piv) {
mds->inotable->apply_release_ids(inos);
assert(mds->inotable->get_version() == piv);
}
// 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<CDentry*>(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<client_t,entity_inst_t>& cm,
map<client_t,uint64_t>& sseqmap)
{
version_t pv = mds->sessionmap.get_projected();
dout(10) << "prepare_force_open_sessions " << pv
<< " on " << cm.size() << " clients"
<< dendl;
for (map<client_t,entity_inst_t>::iterator p = cm.begin(); p != cm.end(); ++p) {
Session *session = mds->sessionmap.get_or_add_session(p->second);
pv = mds->sessionmap.mark_projected(session);
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<client_t,entity_inst_t>& cm,
map<client_t,uint64_t>& 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;
int sessions_inserted = 0;
for (map<client_t,entity_inst_t>::iterator p = cm.begin(); p != cm.end(); ++p) {
sessions_inserted++;
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) {
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<Session*> sessions;
mds->sessionmap.get_client_session_set(sessions);
for (set<Session*>::const_iterator p = sessions.begin();
p != sessions.end();
++p) {
Session *session = *p;
if (session->is_closing() ||
session->is_killing() ||
session->is_closed())
continue;
journal_close_session(session, Session::STATE_CLOSING, NULL);
}
mdlog->wait_for_safe(new C_MDS_TerminatedSessions(this));
}
void Server::find_idle_sessions()
{
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;
}
while (1) {
Session *session = mds->sessionmap.get_oldest_session(Session::STATE_STALE);
if (!session)
break;
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;
}
utime_t age = now;
age -= session->last_cap_renew;
mds->clog->info() << "closing stale session " << session->info.inst
<< " after " << age << "\n";
dout(10) << "autoclosing stale session " << session->info.inst << " last " << session->last_cap_renew << dendl;
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)
{
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);
}
}
}
void Server::journal_close_session(Session *session, int state, Context *on_safe)
{
uint64_t sseq = mds->sessionmap.set_state(session, state);
version_t pv = mds->sessionmap.mark_projected(session);
version_t piv = 0;
// release alloc and pending-alloc inos for this session
// and wipe out session state, in case the session close aborts for some reason
interval_set<inodeno_t> both;
both.swap(session->info.prealloc_inos);
both.insert(session->pending_prealloc_inos);
session->pending_prealloc_inos.clear();
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<MDRequestImpl*>::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 << ")\n";
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)\n";
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)\n";
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));
mds->clog->debug() << "reconnect by " << session->info.inst << " after " << delay << "\n";
// snaprealms
for (vector<ceph_mds_snaprealm_reconnect>::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<inodeno_t, cap_reconnect_t>::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()
{
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;
for (set<client_t>::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;
kill_session(session, NULL);
failed_reconnects++;
}
client_reconnect_gather.clear();
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<uint64_t, ceph_filelock>(lock.start, lock));
++in->get_fcntl_lock_state()->client_held_lock_counts[client];
}
::decode(numlocks, p);
for (int i = 0; i < numlocks; ++i) {
::decode(lock, p);
lock.client = client;
in->get_flock_lock_state()->held_locks.insert(pair<uint64_t, ceph_filelock> (lock.start, lock));
++in->get_flock_lock_state()->client_held_lock_counts[client];
}
}
/**
* Call this when the MDCache is oversized, to send requests to the clients
* to trim some caps, and consequently unpin some inodes in the MDCache so
* that it can trim too.
*/
void Server::recall_client_state(float ratio)
{
int max_caps_per_client = (int)(g_conf->mds_cache_size * .8);
int min_caps_per_client = 100;
dout(10) << "recall_client_state " << ratio
<< ", caps per client " << min_caps_per_client << "-" << max_caps_per_client
<< dendl;
set<Session*> sessions;
mds->sessionmap.get_client_session_set(sessions);
for (set<Session*>::const_iterator p = sessions.begin();
p != sessions.end();
++p) {
Session *session = *p;
if (!session->is_open() ||
!session->info.inst.name.is_client())
continue;
dout(10) << " session " << session->info.inst
<< " caps " << session->caps.size()
<< ", leases " << session->leases.size()
<< dendl;
if (session->caps.size() > min_caps_per_client) {
int newlim = MIN((int)(session->caps.size() * ratio), max_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<Session*> sessions;
mds->sessionmap.get_client_session_set(sessions);
for (set<Session*>::const_iterator p = sessions.begin();
p != sessions.end();
++p) {
Session *session = *p;
if (!session->info.inst.name.is_client() ||
!(session->is_open() || session->is_stale()))
continue;
mds->send_message_client(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;