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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 "MDSTable.h"
#include "MDS.h"
#include "MDLog.h"
#include "osdc/Filer.h"
#include "include/types.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() << "." << table_name << ": "
class C_MT_Save : public Context {
MDSTable *ida;
version_t version;
public:
C_MT_Save(MDSTable *i, version_t v) : ida(i), version(v) {}
void finish(int r) {
assert(r >= 0);
ida->save_2(version);
}
};
void MDSTable::save(Context *onfinish, version_t v)
{
if (v > 0 && v <= committing_version) {
dout(10) << "save v " << version << " - already saving "
<< committing_version << " >= needed " << v << dendl;
waitfor_save[v].push_back(onfinish);
return;
}
dout(10) << "save v " << version << dendl;
assert(is_active());
bufferlist bl;
::encode(version, bl);
encode_state(bl);
committing_version = version;
if (onfinish)
waitfor_save[version].push_back(onfinish);
// write (async)
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_MT_Save(this, version));
}
void MDSTable::save_2(version_t v)
{
dout(10) << "save_2 v " << v << dendl;
committed_version = v;
list<Context*> ls;
while (!waitfor_save.empty()) {
if (waitfor_save.begin()->first > v) break;
ls.splice(ls.end(), waitfor_save.begin()->second);
waitfor_save.erase(waitfor_save.begin());
}
finish_contexts(g_ceph_context, ls,0);
}
void MDSTable::reset()
{
reset_state();
state = STATE_ACTIVE;
}
// -----------------------
class C_MT_Load : public Context {
public:
MDSTable *ida;
Context *onfinish;
bufferlist bl;
C_MT_Load(MDSTable *i, Context *o) : ida(i), onfinish(o) {}
void finish(int r) {
ida->load_2(r, bl, onfinish);
}
};
object_t MDSTable::get_object_name()
{
char n[50];
if (per_mds)
snprintf(n, sizeof(n), "mds%d_%s", mds->whoami, table_name);
else
snprintf(n, sizeof(n), "mds_%s", table_name);
return object_t(n);
}
void MDSTable::load(Context *onfinish)
{
dout(10) << "load" << dendl;
assert(is_undef());
state = STATE_OPENING;
C_MT_Load *c = new C_MT_Load(this, onfinish);
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 MDSTable::load_2(int r, bufferlist& bl, Context *onfinish)
{
assert(is_opening());
state = STATE_ACTIVE;
if (r >= 0) {
dout(10) << "load_2 got " << bl.length() << " bytes" << dendl;
bufferlist::iterator p = bl.begin();
::decode(version, p);
projected_version = committed_version = version;
dout(10) << "load_2 loaded v" << version << dendl;
decode_state(p);
}
else {
dout(10) << "load_2 found no table" << dendl;
assert(0); // this shouldn't happen if mkfs finished.
reset();
}
if (onfinish) {
onfinish->finish(0);
delete onfinish;
}
}
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