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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 "MDS.h"
#include "MDCache.h"
#include "SessionMap.h"
#include "osdc/Filer.h"
#include "common/config.h"
#include "include/assert.h"
#include "global/debug.h"
#define dout_subsys ceph_subsys_mds
#undef dout_prefix
#define dout_prefix *_dout << "mds." << mds->get_nodeid() << ".sessionmap "
void SessionMap::dump()
{
dout(10) << "dump" << dendl;
for (hash_map<entity_name_t,Session*>::iterator p = session_map.begin();
p != session_map.end();
++p)
dout(10) << p->first << " " << p->second
<< " state " << p->second->get_state_name()
<< " completed " << p->second->completed_requests
<< " prealloc_inos " << p->second->prealloc_inos
<< " used_ions " << p->second->used_inos
<< dendl;
}
// ----------------
// LOAD
object_t SessionMap::get_object_name()
{
char s[30];
snprintf(s, sizeof(s), "mds%d_sessionmap", mds->whoami);
return object_t(s);
}
class C_SM_Load : public Context {
SessionMap *sessionmap;
public:
bufferlist bl;
C_SM_Load(SessionMap *cm) : sessionmap(cm) {}
void finish(int r) {
sessionmap->_load_finish(r, bl);
}
};
void SessionMap::load(Context *onload)
{
dout(10) << "load" << dendl;
if (onload)
waiting_for_load.push_back(onload);
C_SM_Load *c = new C_SM_Load(this);
object_t oid = get_object_name();
object_locator_t oloc(mds->mdsmap->get_metadata_pg_pool());
mds->objecter->read_full(oid, oloc, CEPH_NOSNAP, &c->bl, 0, c);
}
void SessionMap::_load_finish(int r, bufferlist &bl)
{
bufferlist::iterator blp = bl.begin();
dump();
decode(blp); // note: this sets last_cap_renew = now()
dout(10) << "_load_finish v " << version
<< ", " << session_map.size() << " sessions, "
<< bl.length() << " bytes"
<< dendl;
projected = committing = committed = version;
dump();
finish_contexts(g_ceph_context, waiting_for_load);
}
// ----------------
// SAVE
class C_SM_Save : public Context {
SessionMap *sessionmap;
version_t version;
public:
C_SM_Save(SessionMap *cm, version_t v) : sessionmap(cm), version(v) {}
void finish(int r) {
sessionmap->_save_finish(version);
}
};
void SessionMap::save(Context *onsave, version_t needv)
{
dout(10) << "save needv " << needv << ", v " << version << dendl;
if (needv && committing >= needv) {
assert(committing > committed);
commit_waiters[committing].push_back(onsave);
return;
}
commit_waiters[version].push_back(onsave);
bufferlist bl;
encode(bl);
committing = version;
SnapContext snapc;
object_t oid = get_object_name();
object_locator_t oloc(mds->mdsmap->get_metadata_pg_pool());
mds->objecter->write_full(oid, oloc,
snapc,
bl, ceph_clock_now(g_ceph_context), 0,
NULL, new C_SM_Save(this, version));
}
void SessionMap::_save_finish(version_t v)
{
dout(10) << "_save_finish v" << v << dendl;
committed = v;
finish_contexts(g_ceph_context, commit_waiters[v]);
commit_waiters.erase(v);
}
// -------------------
void SessionMap::encode(bufferlist& bl)
{
uint64_t pre = -1; // for 0.19 compatibility; we forgot an encoding prefix.
::encode(pre, bl);
__u8 struct_v = 2;
::encode(struct_v, bl);
::encode(version, bl);
for (hash_map<entity_name_t,Session*>::iterator p = session_map.begin();
p != session_map.end();
++p)
if (p->second->is_open() ||
p->second->is_closing() ||
p->second->is_stale() ||
p->second->is_killing()) {
::encode(p->first, bl);
p->second->encode(bl);
}
}
void SessionMap::decode(bufferlist::iterator& p)
{
utime_t now = ceph_clock_now(g_ceph_context);
uint64_t pre;
::decode(pre, p);
if (pre == (uint64_t)-1) {
__u8 struct_v;
::decode(struct_v, p);
assert(struct_v == 2);
::decode(version, p);
while (!p.end()) {
entity_inst_t inst;
::decode(inst.name, p);
Session *s = get_or_add_session(inst);
if (s->is_closed())
set_state(s, Session::STATE_OPEN);
s->decode(p);
}
} else {
// --- old format ----
version = pre;
// this is a meaningless upper bound. can be ignored.
__u32 n;
::decode(n, p);
while (n-- && !p.end()) {
bufferlist::iterator p2 = p;
Session *s = new Session;
s->decode(p);
if (session_map.count(s->inst.name)) {
// eager client connected too fast! aie.
dout(10) << " already had session for " << s->inst.name << ", recovering" << dendl;
entity_name_t n = s->inst.name;
delete s;
s = session_map[n];
p = p2;
s->decode(p);
} else {
session_map[s->inst.name] = s;
}
set_state(s, Session::STATE_OPEN);
s->last_cap_renew = now;
}
}
}
void SessionMap::wipe()
{
dout(1) << "wipe start" << dendl;
dump();
while (!session_map.empty()) {
Session *s = session_map.begin()->second;
remove_session(s);
}
version = ++projected;
dout(1) << "wipe result" << dendl;
dump();
dout(1) << "wipe done" << dendl;
}
void SessionMap::wipe_ino_prealloc()
{
for (hash_map<entity_name_t,Session*>::iterator p = session_map.begin();
p != session_map.end();
++p) {
p->second->pending_prealloc_inos.clear();
p->second->prealloc_inos.clear();
p->second->used_inos.clear();
}
projected = ++version;
}
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