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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 "MDSRank.h"
#include "MDLog.h"
#include "osdc/Filer.h"
#include "include/types.h"
#include "common/config.h"
#include "common/errno.h"
#include "common/Finisher.h"
#include "include/ceph_assert.h"
#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_mds
#undef dout_prefix
#define dout_prefix *_dout << "mds." << rank << "." << table_name << ": "
class MDSTableIOContext : public MDSIOContextBase
{
protected:
MDSTable *ida;
MDSRank *get_mds() override {return ida->mds;}
public:
explicit MDSTableIOContext(MDSTable *ida_) : ida(ida_) {
ceph_assert(ida != NULL);
}
};
class C_IO_MT_Save : public MDSTableIOContext {
version_t version;
public:
C_IO_MT_Save(MDSTable *i, version_t v) : MDSTableIOContext(i), version(v) {}
void finish(int r) override {
ida->save_2(r, version);
}
void print(ostream& out) const override {
out << "table_save(" << ida->table_name << ")";
}
};
void MDSTable::save(MDSContext *onfinish, version_t v)
{
if (v > 0 && v <= committing_version) {
dout(10) << "save v " << version << " - already saving "
<< committing_version << " >= needed " << v << dendl;
if (onfinish)
waitfor_save[v].push_back(onfinish);
return;
}
dout(10) << "save v " << version << dendl;
ceph_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->get_metadata_pool());
mds->objecter->write_full(oid, oloc,
snapc,
bl, ceph::real_clock::now(), 0,
new C_OnFinisher(new C_IO_MT_Save(this, version),
mds->finisher));
}
void MDSTable::save_2(int r, version_t v)
{
if (r < 0) {
dout(1) << "save error " << r << " v " << v << dendl;
mds->clog->error() << "failed to store table " << table_name << " object,"
<< " errno " << r;
mds->handle_write_error(r);
return;
}
dout(10) << "save_2 v " << v << dendl;
committed_version = v;
MDSContext::vec ls;
while (!waitfor_save.empty()) {
auto it = waitfor_save.begin();
if (it->first > v) break;
auto& v = it->second;
ls.insert(ls.end(), v.begin(), v.end());
waitfor_save.erase(it);
}
finish_contexts(g_ceph_context, ls, 0);
}
void MDSTable::reset()
{
reset_state();
projected_version = version;
state = STATE_ACTIVE;
}
// -----------------------
class C_IO_MT_Load : public MDSTableIOContext {
public:
Context *onfinish;
bufferlist bl;
C_IO_MT_Load(MDSTable *i, Context *o) : MDSTableIOContext(i), onfinish(o) {}
void finish(int r) override {
ida->load_2(r, bl, onfinish);
}
void print(ostream& out) const override {
out << "table_load(" << ida->table_name << ")";
}
};
object_t MDSTable::get_object_name() const
{
char n[50];
if (per_mds)
snprintf(n, sizeof(n), "mds%d_%s", int(rank), table_name.c_str());
else
snprintf(n, sizeof(n), "mds_%s", table_name.c_str());
return object_t(n);
}
void MDSTable::load(MDSContext *onfinish)
{
dout(10) << "load" << dendl;
ceph_assert(is_undef());
state = STATE_OPENING;
C_IO_MT_Load *c = new C_IO_MT_Load(this, onfinish);
object_t oid = get_object_name();
object_locator_t oloc(mds->get_metadata_pool());
mds->objecter->read_full(oid, oloc, CEPH_NOSNAP, &c->bl, 0,
new C_OnFinisher(c, mds->finisher));
}
void MDSTable::load_2(int r, bufferlist& bl, Context *onfinish)
{
ceph_assert(is_opening());
state = STATE_ACTIVE;
if (r == -CEPHFS_EBLOCKLISTED) {
mds->respawn();
return;
}
if (r < 0) {
derr << "load_2 could not read table: " << r << dendl;
mds->clog->error() << "error reading table object '" << get_object_name()
<< "' " << r << " (" << cpp_strerror(r) << ")";
mds->damaged();
ceph_assert(r >= 0); // Should be unreachable because damaged() calls respawn()
}
dout(10) << "load_2 got " << bl.length() << " bytes" << dendl;
auto p = bl.cbegin();
try {
decode(version, p);
projected_version = committed_version = version;
dout(10) << "load_2 loaded v" << version << dendl;
decode_state(p);
} catch (buffer::error &e) {
mds->clog->error() << "error decoding table object '" << get_object_name()
<< "': " << e.what();
mds->damaged();
ceph_assert(r >= 0); // Should be unreachable because damaged() calls respawn()
}
if (onfinish) {
onfinish->complete(0);
}
}
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