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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/ceph_assert.h" // lexical_cast includes system assert.h
#include <boost/config/warning_disable.hpp>
#include <boost/fusion/include/std_pair.hpp>
#include <boost/range/adaptor/reversed.hpp>
#include "MDSRank.h"
#include "Server.h"
#include "Locker.h"
#include "MDCache.h"
#include "MDLog.h"
#include "Migrator.h"
#include "MDBalancer.h"
#include "InoTable.h"
#include "SnapClient.h"
#include "Mutation.h"
#include "MetricsHandler.h"
#include "cephfs_features.h"
#include "msg/Messenger.h"
#include "osdc/Objecter.h"
#include "events/EUpdate.h"
#include "events/EPeerUpdate.h"
#include "events/ESession.h"
#include "events/EOpen.h"
#include "events/ECommitted.h"
#include "events/EPurged.h"
#include "include/stringify.h"
#include "include/filepath.h"
#include "common/errno.h"
#include "common/Timer.h"
#include "common/perf_counters.h"
#include "include/compat.h"
#include "osd/OSDMap.h"
#include <errno.h>
#include <list>
#include <regex>
#include <string_view>
#include <functional>
#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 "
using namespace std;
class ServerContext : public MDSContext {
protected:
Server *server;
MDSRank *get_mds() override
{
return server->mds;
}
public:
explicit ServerContext(Server *s) : server(s) {
ceph_assert(server != NULL);
}
};
class Batch_Getattr_Lookup : public BatchOp {
protected:
Server* server;
ceph::ref_t<MDRequestImpl> mdr;
std::vector<ceph::ref_t<MDRequestImpl>> batch_reqs;
int res = 0;
public:
Batch_Getattr_Lookup(Server* s, const ceph::ref_t<MDRequestImpl>& r)
: server(s), mdr(r) {
if (mdr->client_request->get_op() == CEPH_MDS_OP_LOOKUP)
mdr->batch_op_map = &mdr->dn[0].back()->batch_ops;
else
mdr->batch_op_map = &mdr->in[0]->batch_ops;
}
void add_request(const ceph::ref_t<MDRequestImpl>& r) override {
batch_reqs.push_back(r);
}
ceph::ref_t<MDRequestImpl> find_new_head() override {
while (!batch_reqs.empty()) {
auto r = std::move(batch_reqs.back());
batch_reqs.pop_back();
if (r->killed)
continue;
r->batch_op_map = mdr->batch_op_map;
mdr->batch_op_map = nullptr;
mdr = r;
return mdr;
}
return nullptr;
}
void _forward(mds_rank_t t) override {
MDCache* mdcache = server->mdcache;
mdcache->mds->forward_message_mds(mdr->release_client_request(), t);
mdr->set_mds_stamp(ceph_clock_now());
for (auto& m : batch_reqs) {
if (!m->killed)
mdcache->request_forward(m, t);
}
batch_reqs.clear();
}
void _respond(int r) override {
mdr->set_mds_stamp(ceph_clock_now());
for (auto& m : batch_reqs) {
if (!m->killed) {
m->tracei = mdr->tracei;
m->tracedn = mdr->tracedn;
server->respond_to_request(m, r);
}
}
batch_reqs.clear();
server->reply_client_request(mdr, make_message<MClientReply>(*mdr->client_request, r));
}
void print(std::ostream& o) {
o << "[batch front=" << *mdr << "]";
}
};
class ServerLogContext : public MDSLogContextBase {
protected:
Server *server;
MDSRank *get_mds() override
{
return server->mds;
}
MDRequestRef mdr;
void pre_finish(int r) override {
if (mdr)
mdr->mark_event("journal_committed: ");
}
public:
explicit ServerLogContext(Server *s) : server(s) {
ceph_assert(server != NULL);
}
explicit ServerLogContext(Server *s, MDRequestRef& r) : server(s), mdr(r) {
ceph_assert(server != NULL);
}
};
void Server::create_logger()
{
PerfCountersBuilder plb(g_ceph_context, "mds_server", l_mdss_first, l_mdss_last);
plb.add_u64_counter(l_mdss_handle_client_request, "handle_client_request",
"Client requests", "hcr", PerfCountersBuilder::PRIO_INTERESTING);
plb.add_u64_counter(l_mdss_handle_peer_request, "handle_peer_request",
"Peer requests", "hsr", PerfCountersBuilder::PRIO_INTERESTING);
plb.add_u64_counter(l_mdss_handle_client_session,
"handle_client_session", "Client session messages", "hcs",
PerfCountersBuilder::PRIO_INTERESTING);
plb.add_u64_counter(l_mdss_cap_revoke_eviction, "cap_revoke_eviction",
"Cap Revoke Client Eviction", "cre", PerfCountersBuilder::PRIO_INTERESTING);
plb.add_u64_counter(l_mdss_cap_acquisition_throttle,
"cap_acquisition_throttle", "Cap acquisition throttle counter", "cat",
PerfCountersBuilder::PRIO_INTERESTING);
// fop latencies are useful
plb.set_prio_default(PerfCountersBuilder::PRIO_USEFUL);
plb.add_time_avg(l_mdss_req_lookuphash_latency, "req_lookuphash_latency",
"Request type lookup hash of inode latency");
plb.add_time_avg(l_mdss_req_lookupino_latency, "req_lookupino_latency",
"Request type lookup inode latency");
plb.add_time_avg(l_mdss_req_lookupparent_latency, "req_lookupparent_latency",
"Request type lookup parent latency");
plb.add_time_avg(l_mdss_req_lookupname_latency, "req_lookupname_latency",
"Request type lookup name latency");
plb.add_time_avg(l_mdss_req_lookup_latency, "req_lookup_latency",
"Request type lookup latency");
plb.add_time_avg(l_mdss_req_lookupsnap_latency, "req_lookupsnap_latency",
"Request type lookup snapshot latency");
plb.add_time_avg(l_mdss_req_getattr_latency, "req_getattr_latency",
"Request type get attribute latency");
plb.add_time_avg(l_mdss_req_setattr_latency, "req_setattr_latency",
"Request type set attribute latency");
plb.add_time_avg(l_mdss_req_setlayout_latency, "req_setlayout_latency",
"Request type set file layout latency");
plb.add_time_avg(l_mdss_req_setdirlayout_latency, "req_setdirlayout_latency",
"Request type set directory layout latency");
plb.add_time_avg(l_mdss_req_setxattr_latency, "req_setxattr_latency",
"Request type set extended attribute latency");
plb.add_time_avg(l_mdss_req_rmxattr_latency, "req_rmxattr_latency",
"Request type remove extended attribute latency");
plb.add_time_avg(l_mdss_req_readdir_latency, "req_readdir_latency",
"Request type read directory latency");
plb.add_time_avg(l_mdss_req_setfilelock_latency, "req_setfilelock_latency",
"Request type set file lock latency");
plb.add_time_avg(l_mdss_req_getfilelock_latency, "req_getfilelock_latency",
"Request type get file lock latency");
plb.add_time_avg(l_mdss_req_create_latency, "req_create_latency",
"Request type create latency");
plb.add_time_avg(l_mdss_req_open_latency, "req_open_latency",
"Request type open latency");
plb.add_time_avg(l_mdss_req_mknod_latency, "req_mknod_latency",
"Request type make node latency");
plb.add_time_avg(l_mdss_req_link_latency, "req_link_latency",
"Request type link latency");
plb.add_time_avg(l_mdss_req_unlink_latency, "req_unlink_latency",
"Request type unlink latency");
plb.add_time_avg(l_mdss_req_rmdir_latency, "req_rmdir_latency",
"Request type remove directory latency");
plb.add_time_avg(l_mdss_req_rename_latency, "req_rename_latency",
"Request type rename latency");
plb.add_time_avg(l_mdss_req_mkdir_latency, "req_mkdir_latency",
"Request type make directory latency");
plb.add_time_avg(l_mdss_req_symlink_latency, "req_symlink_latency",
"Request type symbolic link latency");
plb.add_time_avg(l_mdss_req_lssnap_latency, "req_lssnap_latency",
"Request type list snapshot latency");
plb.add_time_avg(l_mdss_req_mksnap_latency, "req_mksnap_latency",
"Request type make snapshot latency");
plb.add_time_avg(l_mdss_req_rmsnap_latency, "req_rmsnap_latency",
"Request type remove snapshot latency");
plb.add_time_avg(l_mdss_req_renamesnap_latency, "req_renamesnap_latency",
"Request type rename snapshot latency");
plb.set_prio_default(PerfCountersBuilder::PRIO_DEBUGONLY);
plb.add_u64_counter(l_mdss_dispatch_client_request, "dispatch_client_request",
"Client requests dispatched");
plb.add_u64_counter(l_mdss_dispatch_peer_request, "dispatch_server_request",
"Server requests dispatched");
logger = plb.create_perf_counters();
g_ceph_context->get_perfcounters_collection()->add(logger);
}
Server::Server(MDSRank *m, MetricsHandler *metrics_handler) :
mds(m),
mdcache(mds->mdcache), mdlog(mds->mdlog),
recall_throttle(g_conf().get_val<double>("mds_recall_max_decay_rate")),
metrics_handler(metrics_handler)
{
forward_all_requests_to_auth = g_conf().get_val<bool>("mds_forward_all_requests_to_auth");
replay_unsafe_with_closed_session = g_conf().get_val<bool>("mds_replay_unsafe_with_closed_session");
cap_revoke_eviction_timeout = g_conf().get_val<double>("mds_cap_revoke_eviction_timeout");
max_snaps_per_dir = g_conf().get_val<uint64_t>("mds_max_snaps_per_dir");
delegate_inos_pct = g_conf().get_val<uint64_t>("mds_client_delegate_inos_pct");
max_caps_per_client = g_conf().get_val<uint64_t>("mds_max_caps_per_client");
cap_acquisition_throttle = g_conf().get_val<uint64_t>("mds_session_cap_acquisition_throttle");
max_caps_throttle_ratio = g_conf().get_val<double>("mds_session_max_caps_throttle_ratio");
caps_throttle_retry_request_timeout = g_conf().get_val<double>("mds_cap_acquisition_throttle_retry_request_timeout");
dir_max_entries = g_conf().get_val<uint64_t>("mds_dir_max_entries");
bal_fragment_size_max = g_conf().get_val<int64_t>("mds_bal_fragment_size_max");
supported_features = feature_bitset_t(CEPHFS_FEATURES_MDS_SUPPORTED);
}
void Server::dispatch(const cref_t<Message> &m)
{
switch (m->get_type()) {
case CEPH_MSG_CLIENT_RECONNECT:
handle_client_reconnect(ref_cast<MClientReconnect>(m));
return;
}
/*
*In reconnect phase, client sent unsafe requests to mds before reconnect msg. Seting sessionclosed_isok will handle scenario like this:
1. In reconnect phase, client sent unsafe requests to mds.
2. It reached reconnect timeout. All sessions without sending reconnect msg in time, some of which may had sent unsafe requests, are marked as closed.
(Another situation is #31668, which will deny all client reconnect msg to speed up reboot).
3.So these unsafe request from session without sending reconnect msg in time or being denied could be handled in clientreplay phase.
*/
bool sessionclosed_isok = replay_unsafe_with_closed_session;
// active?
// handle_peer_request()/handle_client_session() will wait if necessary
if (m->get_type() == CEPH_MSG_CLIENT_REQUEST && !mds->is_active()) {
const auto &req = ref_cast<MClientRequest>(m);
if (mds->is_reconnect() || mds->get_want_state() == CEPH_MDS_STATE_RECONNECT) {
Session *session = mds->get_session(req);
if (!session || (!session->is_open() && !sessionclosed_isok)) {
dout(5) << "session is closed, dropping " << req->get_reqid() << dendl;
return;
}
bool queue_replay = false;
if (req->is_replay() || req->is_async()) {
dout(3) << "queuing replayed op" << dendl;
queue_replay = true;
if (req->head.ino &&
!session->have_completed_request(req->get_reqid().tid, nullptr)) {
inodeno_t ino(req->head.ino);
mdcache->add_replay_ino_alloc(ino);
if (replay_unsafe_with_closed_session &&
session->free_prealloc_inos.contains(ino)) {
// don't purge inodes that will be created by later replay
session->free_prealloc_inos.erase(ino);
session->delegated_inos.insert(ino);
}
}
} else if (req->get_retry_attempt()) {
// process completed request in clientreplay stage. The completed request
// might have created new file/directorie. This guarantees MDS sends a reply
// to client before other request modifies the new file/directorie.
if (session->have_completed_request(req->get_reqid().tid, NULL)) {
dout(3) << "queuing completed op" << dendl;
queue_replay = true;
}
// this request was created before the cap reconnect message, drop any embedded
// cap releases.
req->releases.clear();
}
if (queue_replay) {
req->mark_queued_for_replay();
mds->enqueue_replay(new C_MDS_RetryMessage(mds, m));
return;
}
}
bool wait_for_active = true;
if (mds->is_stopping()) {
wait_for_active = false;
} else if (mds->is_clientreplay()) {
if (req->is_queued_for_replay()) {
wait_for_active = false;
}
}
if (wait_for_active) {
dout(3) << "not active yet, waiting" << dendl;
mds->wait_for_active(new C_MDS_RetryMessage(mds, m));
return;
}
}
switch (m->get_type()) {
case CEPH_MSG_CLIENT_SESSION:
handle_client_session(ref_cast<MClientSession>(m));
return;
case CEPH_MSG_CLIENT_REQUEST:
handle_client_request(ref_cast<MClientRequest>(m));
return;
case CEPH_MSG_CLIENT_RECLAIM:
handle_client_reclaim(ref_cast<MClientReclaim>(m));
return;
case MSG_MDS_PEER_REQUEST:
handle_peer_request(ref_cast<MMDSPeerRequest>(m));
return;
default:
derr << "server unknown message " << m->get_type() << dendl;
ceph_abort_msg("server unknown message");
}
}
// ----------------------------------------------------------
// SESSION management
class C_MDS_session_finish : public ServerLogContext {
Session *session;
uint64_t state_seq;
bool open;
version_t cmapv;
interval_set<inodeno_t> inos_to_free;
version_t inotablev;
interval_set<inodeno_t> inos_to_purge;
LogSegment *ls = nullptr;
Context *fin;
public:
C_MDS_session_finish(Server *srv, Session *se, uint64_t sseq, bool s, version_t mv, Context *fin_ = nullptr) :
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,
const interval_set<inodeno_t>& to_free, version_t iv,
const interval_set<inodeno_t>& to_purge, LogSegment *_ls, Context *fin_ = nullptr) :
ServerLogContext(srv), session(se), state_seq(sseq), open(s), cmapv(mv),
inos_to_free(to_free), inotablev(iv), inos_to_purge(to_purge), ls(_ls), fin(fin_) {}
void finish(int r) override {
ceph_assert(r == 0);
server->_session_logged(session, state_seq, open, cmapv, inos_to_free, inotablev, inos_to_purge, ls);
if (fin) {
fin->complete(r);
}
}
};
Session* Server::find_session_by_uuid(std::string_view uuid)
{
Session* session = nullptr;
for (auto& it : mds->sessionmap.get_sessions()) {
auto& metadata = it.second->info.client_metadata;
auto p = metadata.find("uuid");
if (p == metadata.end() || p->second != uuid)
continue;
if (!session) {
session = it.second;
} else if (!session->reclaiming_from) {
ceph_assert(it.second->reclaiming_from == session);
session = it.second;
} else {
ceph_assert(session->reclaiming_from == it.second);
}
}
return session;
}
void Server::reclaim_session(Session *session, const cref_t<MClientReclaim> &m)
{
if (!session->is_open() && !session->is_stale()) {
dout(10) << "session not open, dropping this req" << dendl;
return;
}
auto reply = make_message<MClientReclaimReply>(0);
if (m->get_uuid().empty()) {
dout(10) << __func__ << " invalid message (no uuid)" << dendl;
reply->set_result(-CEPHFS_EINVAL);
mds->send_message_client(reply, session);
return;
}
unsigned flags = m->get_flags();
if (flags != CEPH_RECLAIM_RESET) { // currently only support reset
dout(10) << __func__ << " unsupported flags" << dendl;
reply->set_result(-CEPHFS_EOPNOTSUPP);
mds->send_message_client(reply, session);
return;
}
Session* target = find_session_by_uuid(m->get_uuid());
if (target) {
if (session->info.auth_name != target->info.auth_name) {
dout(10) << __func__ << " session auth_name " << session->info.auth_name
<< " != target auth_name " << target->info.auth_name << dendl;
reply->set_result(-CEPHFS_EPERM);
mds->send_message_client(reply, session);
}
ceph_assert(!target->reclaiming_from);
ceph_assert(!session->reclaiming_from);
session->reclaiming_from = target;
reply->set_addrs(entity_addrvec_t(target->info.inst.addr));
}
if (flags & CEPH_RECLAIM_RESET) {
finish_reclaim_session(session, reply);
return;
}
ceph_abort();
}
void Server::finish_reclaim_session(Session *session, const ref_t<MClientReclaimReply> &reply)
{
Session *target = session->reclaiming_from;
if (target) {
session->reclaiming_from = nullptr;
Context *send_reply;
if (reply) {
int64_t session_id = session->get_client().v;
send_reply = new LambdaContext([this, session_id, reply](int r) {
ceph_assert(ceph_mutex_is_locked_by_me(mds->mds_lock));
Session *session = mds->sessionmap.get_session(entity_name_t::CLIENT(session_id));
if (!session) {
return;
}
auto epoch = mds->objecter->with_osdmap([](const OSDMap &map){ return map.get_epoch(); });
reply->set_epoch(epoch);
mds->send_message_client(reply, session);
});
} else {
send_reply = nullptr;
}
bool blocklisted = mds->objecter->with_osdmap([target](const OSDMap &map) {
return map.is_blocklisted(target->info.inst.addr);
});
if (blocklisted || !g_conf()->mds_session_blocklist_on_evict) {
kill_session(target, send_reply);
} else {
CachedStackStringStream css;
mds->evict_client(target->get_client().v, false, true, *css, send_reply);
}
} else if (reply) {
mds->send_message_client(reply, session);
}
}
void Server::handle_client_reclaim(const cref_t<MClientReclaim> &m)
{
Session *session = mds->get_session(m);
dout(3) << __func__ << " " << *m << " from " << m->get_source() << dendl;
ceph_assert(m->get_source().is_client()); // should _not_ come from an mds!
if (!session) {
dout(0) << " ignoring sessionless msg " << *m << dendl;
return;
}
std::string_view fs_name = mds->mdsmap->get_fs_name();
if (!fs_name.empty() && !session->fs_name_capable(fs_name, MAY_READ)) {
dout(0) << " dropping message not allowed for this fs_name: " << *m << dendl;
return;
}
if (mds->get_state() < MDSMap::STATE_CLIENTREPLAY) {
mds->wait_for_replay(new C_MDS_RetryMessage(mds, m));
return;
}
if (m->get_flags() & MClientReclaim::FLAG_FINISH) {
finish_reclaim_session(session);
} else {
reclaim_session(session, m);
}
}
void Server::handle_client_session(const cref_t<MClientSession> &m)
{
version_t pv;
Session *session = mds->get_session(m);
dout(3) << "handle_client_session " << *m << " from " << m->get_source() << dendl;
ceph_assert(m->get_source().is_client()); // should _not_ come from an mds!
if (!session) {
dout(0) << " ignoring sessionless msg " << *m << dendl;
auto reply = make_message<MClientSession>(CEPH_SESSION_REJECT);
reply->metadata["error_string"] = "sessionless";
mds->send_message(reply, m->get_connection());
return;
}
std::string_view fs_name = mds->mdsmap->get_fs_name();
if (!fs_name.empty() && !session->fs_name_capable(fs_name, MAY_READ)) {
dout(0) << " dropping message not allowed for this fs_name: " << *m << dendl;
auto reply = make_message<MClientSession>(CEPH_SESSION_REJECT);
reply->metadata["error_string"] = "client doesn't have caps for FS \"" +
std::string(fs_name) + "\"";
mds->send_message(std::move(reply), m->get_connection());
return;
}
if (m->get_op() == CEPH_SESSION_REQUEST_RENEWCAPS) {
// always handle renewcaps (state >= MDSMap::STATE_RECONNECT)
} else if (m->get_op() == CEPH_SESSION_REQUEST_CLOSE) {
// close requests need to be handled when mds is active
if (mds->get_state() < MDSMap::STATE_ACTIVE) {
mds->wait_for_active(new C_MDS_RetryMessage(mds, m));
return;
}
} else {
if (mds->get_state() < MDSMap::STATE_CLIENTREPLAY) {
mds->wait_for_replay(new C_MDS_RetryMessage(mds, m));
return;
}
}
if (logger)
logger->inc(l_mdss_handle_client_session);
uint64_t sseq = 0;
switch (m->get_op()) {
case CEPH_SESSION_REQUEST_OPEN:
if (session->is_opening() ||
session->is_open() ||
session->is_stale() ||
session->is_killing() ||
terminating_sessions) {
dout(10) << "currently open|opening|stale|killing, dropping this req" << dendl;
return;
}
ceph_assert(session->is_closed() || session->is_closing());
if (mds->is_stopping()) {
dout(10) << "mds is stopping, dropping open req" << dendl;
return;
}
{
auto& addr = session->info.inst.addr;
session->set_client_metadata(client_metadata_t(m->metadata, m->supported_features, m->metric_spec));
auto& client_metadata = session->info.client_metadata;
auto log_session_status = [this, m, session](std::string_view status, std::string_view err) {
auto now = ceph_clock_now();
auto throttle_elapsed = m->get_recv_complete_stamp() - m->get_throttle_stamp();
auto elapsed = now - m->get_recv_stamp();
CachedStackStringStream css;
*css << "New client session:"
<< " addr=\"" << session->info.inst.addr << "\""
<< ",elapsed=" << elapsed
<< ",throttled=" << throttle_elapsed
<< ",status=\"" << status << "\"";
if (!err.empty()) {
*css << ",error=\"" << err << "\"";
}
const auto& metadata = session->info.client_metadata;
if (auto it = metadata.find("root"); it != metadata.end()) {
*css << ",root=\"" << it->second << "\"";
}
dout(2) << css->strv() << dendl;
};
auto send_reject_message = [this, &session, &log_session_status](std::string_view err_str, unsigned flags=0) {
auto m = make_message<MClientSession>(CEPH_SESSION_REJECT, 0, flags);
if (session->info.has_feature(CEPHFS_FEATURE_MIMIC))
m->metadata["error_string"] = err_str;
mds->send_message_client(m, session);
log_session_status("REJECTED", err_str);
};
bool blocklisted = mds->objecter->with_osdmap(
[&addr](const OSDMap &osd_map) -> bool {
return osd_map.is_blocklisted(addr);
});
if (blocklisted) {
dout(10) << "rejecting blocklisted client " << addr << dendl;
// This goes on the wire and the "blacklisted" substring is
// depended upon by the kernel client for detecting whether it
// has been blocklisted. If mounted with recover_session=clean
// (since 5.4), it tries to automatically recover itself from
// blocklisting.
unsigned flags = 0;
flags |= MClientSession::SESSION_BLOCKLISTED;
send_reject_message("blocklisted (blacklisted)", flags);
session->clear();
break;
}
if (client_metadata.features.empty())
infer_supported_features(session, client_metadata);
dout(20) << __func__ << " CEPH_SESSION_REQUEST_OPEN metadata entries:" << dendl;
dout(20) << " features: '" << client_metadata.features << "'" << dendl;
dout(20) << " metric specification: [" << client_metadata.metric_spec << "]" << dendl;
for (const auto& p : client_metadata) {
dout(20) << " " << p.first << ": " << p.second << dendl;
}
feature_bitset_t missing_features = required_client_features;
missing_features -= client_metadata.features;
if (!missing_features.empty()) {
CachedStackStringStream css;
*css << "missing required features '" << missing_features << "'";
send_reject_message(css->strv());
mds->clog->warn() << "client session (" << session->info.inst
<< ") lacks required features " << missing_features
<< "; client supports " << client_metadata.features;
session->clear();
break;
}
// Special case for the 'root' metadata path; validate that the claimed
// root is actually within the caps of the session
if (auto it = client_metadata.find("root"); it != client_metadata.end()) {
auto claimed_root = it->second;
CachedStackStringStream css;
bool denied = false;
// claimed_root has a leading "/" which we strip before passing
// into caps check
if (claimed_root.empty() || claimed_root[0] != '/') {
denied = true;
*css << "invalue root '" << claimed_root << "'";
} else if (!session->auth_caps.path_capable(claimed_root.substr(1))) {
denied = true;
*css << "non-allowable root '" << claimed_root << "'";
}
if (denied) {
// Tell the client we're rejecting their open
send_reject_message(css->strv());
mds->clog->warn() << "client session with " << css->strv()
<< " denied (" << session->info.inst << ")";
session->clear();
break;
}
}
if (auto it = client_metadata.find("uuid"); it != client_metadata.end()) {
if (find_session_by_uuid(it->second)) {
send_reject_message("duplicated session uuid");
mds->clog->warn() << "client session with duplicated session uuid '"
<< it->second << "' denied (" << session->info.inst << ")";
session->clear();
break;
}
}
if (session->is_closed()) {
mds->sessionmap.add_session(session);
}
pv = mds->sessionmap.mark_projected(session);
sseq = mds->sessionmap.set_state(session, Session::STATE_OPENING);
mds->sessionmap.touch_session(session);
auto fin = new LambdaContext([log_session_status = std::move(log_session_status)](int r){
ceph_assert(r == 0);
log_session_status("ACCEPTED", "");
});
mdlog->start_submit_entry(new ESession(m->get_source_inst(), true, pv, client_metadata),
new C_MDS_session_finish(this, session, sseq, true, pv, fin));
mdlog->flush();
}
break;
case CEPH_SESSION_REQUEST_RENEWCAPS:
if (session->is_open() || session->is_stale()) {
mds->sessionmap.touch_session(session);
if (session->is_stale()) {
mds->sessionmap.set_state(session, Session::STATE_OPEN);
mds->locker->resume_stale_caps(session);
mds->sessionmap.touch_session(session);
}
auto reply = make_message<MClientSession>(CEPH_SESSION_RENEWCAPS, m->get_seq());
mds->send_message_client(reply, session);
} else {
dout(10) << "ignoring renewcaps on non open|stale session (" << session->get_state_name() << ")" << dendl;
}
break;
case CEPH_SESSION_REQUEST_CLOSE:
{
if (session->is_closed() ||
session->is_closing() ||
session->is_killing()) {
dout(10) << "already closed|closing|killing, dropping this req" << dendl;
return;
}
if (session->is_importing()) {
dout(10) << "ignoring close req on importing session" << dendl;
return;
}
ceph_assert(session->is_open() ||
session->is_stale() ||
session->is_opening());
if (m->get_seq() < session->get_push_seq()) {
dout(10) << "old push seq " << m->get_seq() << " < " << session->get_push_seq()
<< ", dropping" << dendl;
return;
}
// We are getting a seq that is higher than expected.
// Handle the same as any other seqn error.
//
if (m->get_seq() != session->get_push_seq()) {
dout(0) << "old push seq " << m->get_seq() << " != " << session->get_push_seq()
<< ", BUGGY!" << dendl;
mds->clog->warn() << "incorrect push seq " << m->get_seq() << " != "
<< session->get_push_seq() << ", dropping" << " from client : " << session->get_human_name();
return;
}
journal_close_session(session, Session::STATE_CLOSING, NULL);
}
break;
case CEPH_SESSION_FLUSHMSG_ACK:
finish_flush_session(session, m->get_seq());
break;
case CEPH_SESSION_REQUEST_FLUSH_MDLOG:
if (mds->is_active())
mdlog->flush();
break;
default:
ceph_abort();
}
}
void Server::flush_session(Session *session, MDSGatherBuilder& gather) {
if (!session->is_open() ||
!session->get_connection() ||
!session->get_connection()->has_feature(CEPH_FEATURE_EXPORT_PEER)) {
return;
}
version_t seq = session->wait_for_flush(gather.new_sub());
mds->send_message_client(
make_message<MClientSession>(CEPH_SESSION_FLUSHMSG, seq), session);
}
void Server::flush_client_sessions(set<client_t>& client_set, MDSGatherBuilder& gather)
{
for (const auto& client : client_set) {
Session *session = mds->sessionmap.get_session(entity_name_t::CLIENT(client.v));
ceph_assert(session);
flush_session(session, gather);
}
}
void Server::finish_flush_session(Session *session, version_t seq)
{
MDSContext::vec finished;
session->finish_flush(seq, finished);
mds->queue_waiters(finished);
}
void Server::_session_logged(Session *session, uint64_t state_seq, bool open, version_t pv,
const interval_set<inodeno_t>& inos_to_free, version_t piv,
const interval_set<inodeno_t>& inos_to_purge, LogSegment *ls)
{
dout(10) << "_session_logged " << session->info.inst
<< " state_seq " << state_seq
<< " " << (open ? "open":"close") << " " << pv
<< " inos_to_free " << inos_to_free << " inotablev " << piv
<< " inos_to_purge " << inos_to_purge << dendl;
if (!open) {
if (inos_to_purge.size()){
ceph_assert(ls);
session->info.prealloc_inos.subtract(inos_to_purge);
ls->purging_inodes.insert(inos_to_purge);
if (mds->is_clientreplay() || mds->is_active() || mds->is_stopping())
mdcache->purge_inodes(inos_to_purge, ls);
}
if (inos_to_free.size()) {
ceph_assert(piv);
ceph_assert(session->is_closing() || session->is_killing() ||
session->is_opening()); // re-open closing session
session->info.prealloc_inos.subtract(inos_to_free);
mds->inotable->apply_release_ids(inos_to_free);
ceph_assert(mds->inotable->get_version() == piv);
}
session->free_prealloc_inos = session->info.prealloc_inos;
session->delegated_inos.clear();
}
mds->sessionmap.mark_dirty(session);
// apply
if (session->get_state_seq() != state_seq) {
dout(10) << " journaled state_seq " << state_seq << " != current " << session->get_state_seq()
<< ", noop" << dendl;
// close must have been canceled (by an import?), or any number of other things..
} else if (open) {
ceph_assert(session->is_opening());
mds->sessionmap.set_state(session, Session::STATE_OPEN);
mds->sessionmap.touch_session(session);
metrics_handler->add_session(session);
ceph_assert(session->get_connection());
auto reply = make_message<MClientSession>(CEPH_SESSION_OPEN);
if (session->info.has_feature(CEPHFS_FEATURE_MIMIC))
reply->supported_features = supported_features;
mds->send_message_client(reply, session);
if (mdcache->is_readonly()) {
auto m = make_message<MClientSession>(CEPH_SESSION_FORCE_RO);
mds->send_message_client(m, session);
}
} else if (session->is_closing() ||
session->is_killing()) {
// kill any lingering capabilities, leases, requests
bool killing = session->is_killing();
while (!session->caps.empty()) {
Capability *cap = session->caps.front();
CInode *in = cap->get_inode();
dout(20) << " killing capability " << ccap_string(cap->issued()) << " on " << *in << dendl;
mds->locker->remove_client_cap(in, cap, killing);
}
while (!session->leases.empty()) {
ClientLease *r = session->leases.front();
CDentry *dn = static_cast<CDentry*>(r->parent);
dout(20) << " killing client lease of " << *dn << dendl;
dn->remove_client_lease(r, mds->locker);
}
if (client_reconnect_gather.erase(session->info.get_client())) {
dout(20) << " removing client from reconnect set" << dendl;
if (client_reconnect_gather.empty()) {
dout(7) << " client " << session->info.inst << " was last reconnect, finishing" << dendl;
reconnect_gather_finish();
}
}
if (client_reclaim_gather.erase(session->info.get_client())) {
dout(20) << " removing client from reclaim set" << dendl;
if (client_reclaim_gather.empty()) {
dout(7) << " client " << session->info.inst << " was last reclaimed, finishing" << dendl;
mds->maybe_clientreplay_done();
}
}
if (session->is_closing()) {
// mark con disposable. if there is a fault, we will get a
// reset and clean it up. if the client hasn't received the
// CLOSE message yet, they will reconnect and get an
// ms_handle_remote_reset() and realize they had in fact closed.
// do this *before* sending the message to avoid a possible
// race.
if (session->get_connection()) {
// Conditional because terminate_sessions will indiscrimately
// put sessions in CLOSING whether they ever had a conn or not.
session->get_connection()->mark_disposable();
}
// reset session
mds->send_message_client(make_message<MClientSession>(CEPH_SESSION_CLOSE), session);
mds->sessionmap.set_state(session, Session::STATE_CLOSED);
session->clear();
metrics_handler->remove_session(session);
mds->sessionmap.remove_session(session);
} else if (session->is_killing()) {
// destroy session, close connection
if (session->get_connection()) {
session->get_connection()->mark_down();
mds->sessionmap.set_state(session, Session::STATE_CLOSED);
session->set_connection(nullptr);
}
metrics_handler->remove_session(session);
mds->sessionmap.remove_session(session);
} else {
ceph_abort();
}
} else {
ceph_abort();
}
}
/**
* Inject sessions from some source other than actual connections.
*
* For example:
* - sessions inferred from journal replay
* - sessions learned from other MDSs during rejoin
* - sessions learned from other MDSs during dir/caps migration
* - sessions learned from other MDSs during a cross-MDS rename
*/
version_t Server::prepare_force_open_sessions(map<client_t,entity_inst_t>& cm,
map<client_t,client_metadata_t>& cmm,
map<client_t, pair<Session*,uint64_t> >& smap)
{
version_t pv = mds->sessionmap.get_projected();
dout(10) << "prepare_force_open_sessions " << pv
<< " on " << cm.size() << " clients"
<< dendl;
mds->objecter->with_osdmap(
[this, &cm, &cmm](const OSDMap &osd_map) {
for (auto p = cm.begin(); p != cm.end(); ) {
if (osd_map.is_blocklisted(p->second.addr)) {
dout(10) << " ignoring blocklisted client." << p->first
<< " (" << p->second.addr << ")" << dendl;
cmm.erase(p->first);
cm.erase(p++);
} else {
++p;
}
}
});
for (map<client_t,entity_inst_t>::iterator p = cm.begin(); p != cm.end(); ++p) {
Session *session = mds->sessionmap.get_or_add_session(p->second);
pv = mds->sessionmap.mark_projected(session);
uint64_t sseq;
if (session->is_closed() ||
session->is_closing() ||
session->is_killing()) {
sseq = mds->sessionmap.set_state(session, Session::STATE_OPENING);
auto q = cmm.find(p->first);
if (q != cmm.end())
session->info.client_metadata.merge(q->second);
} else {
ceph_assert(session->is_open() ||
session->is_opening() ||
session->is_stale());
sseq = 0;
}
smap[p->first] = make_pair(session, sseq);
session->inc_importing();
}
return pv;
}
void Server::finish_force_open_sessions(const map<client_t,pair<Session*,uint64_t> >& smap,
bool dec_import)
{
/*
* FIXME: need to carefully consider the race conditions between a
* client trying to close a session and an MDS doing an import
* trying to force open a session...
*/
dout(10) << "finish_force_open_sessions on " << smap.size() << " clients,"
<< " initial v " << mds->sessionmap.get_version() << dendl;
for (auto &it : smap) {