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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.
*
*/
#ifndef CEPH_SCATTERLOCK_H
#define CEPH_SCATTERLOCK_H
#include "SimpleLock.h"
class ScatterLock : public SimpleLock {
struct more_bits_t {
int state_flags;
utime_t last_scatter;
xlist<ScatterLock*>::item item_updated;
utime_t update_stamp;
more_bits_t(ScatterLock *lock) :
state_flags(0),
item_updated(lock)
{}
bool empty() const {
return
!state_flags &&
!item_updated.is_on_list();
}
};
more_bits_t *_more;
bool have_more() const { return _more ? true : false; }
void try_clear_more() {
if (_more && _more->empty()) {
delete _more;
_more = NULL;
}
}
more_bits_t *more() {
if (!_more)
_more = new more_bits_t(this);
return _more;
}
enum flag_values { // flag values for more_bits_t state
SCATTER_WANTED = 1 << 0,
UNSCATTER_WANTED = 1 << 1,
DIRTY = 1 << 2,
FLUSHING = 1 << 3,
FLUSHED = 1 << 4,
};
public:
ScatterLock(MDSCacheObject *o, LockType *lt) :
SimpleLock(o, lt), _more(NULL)
{}
~ScatterLock() {
if (_more) {
_more->item_updated.remove_myself(); // FIXME this should happen sooner, i think...
delete _more;
}
}
bool is_scatterlock() const {
return true;
}
bool is_sync_and_unlocked() const {
return
SimpleLock::is_sync_and_unlocked() &&
!is_dirty() &&
!is_flushing();
}
bool can_scatter_pin(client_t loner) {
/*
LOCK : NOT okay because it can MIX and force replicas to journal something
TSYN : also not okay for same reason
EXCL : also not okay
MIX : okay, replica can stall before sending AC_SYNCACK
SYNC : okay, replica can stall before sending AC_MIXACK or AC_LOCKACK
*/
return
get_state() == LOCK_SYNC ||
get_state() == LOCK_MIX;
}
xlist<ScatterLock*>::item *get_updated_item() { return &more()->item_updated; }
utime_t get_update_stamp() {
return more()->update_stamp;
}
void set_update_stamp(utime_t t) { more()->update_stamp = t; }
void set_scatter_wanted() {
more()->state_flags |= SCATTER_WANTED;
}
void set_unscatter_wanted() {
more()->state_flags |= UNSCATTER_WANTED;
}
void clear_scatter_wanted() {
if (have_more())
_more->state_flags &= ~SCATTER_WANTED;
try_clear_more();
}
void clear_unscatter_wanted() {
if (have_more())
_more->state_flags &= ~UNSCATTER_WANTED;
try_clear_more();
}
bool get_scatter_wanted() const {
return have_more() ? _more->state_flags & SCATTER_WANTED : false;
}
bool get_unscatter_wanted() const {
return have_more() ? _more->state_flags & UNSCATTER_WANTED : false;
}
bool is_dirty() const {
return have_more() ? _more->state_flags & DIRTY : false;
}
bool is_flushing() const {
return have_more() ? _more->state_flags & FLUSHING: false;
}
bool is_flushed() const {
return have_more() ? _more->state_flags & FLUSHED: false;
}
bool is_dirty_or_flushing() const {
return have_more() ? (is_dirty() || is_flushing()) : false;
}
void mark_dirty() {
if (!is_dirty()) {
if (!is_flushing())
parent->get(MDSCacheObject::PIN_DIRTYSCATTERED);
set_dirty();
}
}
void start_flush() {
if (is_dirty()) {
set_flushing();
clear_dirty();
}
}
void finish_flush() {
if (is_flushing()) {
clear_flushing();
set_flushed();
if (!is_dirty()) {
parent->put(MDSCacheObject::PIN_DIRTYSCATTERED);
parent->clear_dirty_scattered(get_type());
}
}
}
void remove_dirty() {
start_flush();
finish_flush();
}
void clear_flushed() {
if (have_more()) {
_more->state_flags &= ~FLUSHED;
try_clear_more();
}
}
void set_last_scatter(utime_t t) { more()->last_scatter = t; }
utime_t get_last_scatter() {
return more()->last_scatter;
}
void infer_state_from_strong_rejoin(int rstate, bool locktoo) {
if (rstate == LOCK_MIX ||
rstate == LOCK_MIX_LOCK || // replica still has wrlocks?
rstate == LOCK_MIX_SYNC || // "
rstate == LOCK_MIX_TSYN) // "
state = LOCK_MIX;
else if (locktoo && rstate == LOCK_LOCK)
state = LOCK_LOCK;
}
virtual void print(ostream& out) const {
out << "(";
_print(out);
if (is_dirty())
out << " dirty";
if (is_flushing())
out << " flushing";
if (is_flushed())
out << " flushed";
if (get_scatter_wanted())
out << " scatter_wanted";
out << ")";
}
private:
void set_flushing() {
more()->state_flags |= FLUSHING;
}
void clear_flushing() {
if (have_more()) {
_more->state_flags &= ~FLUSHING;
}
}
void set_flushed() {
more()->state_flags |= FLUSHED;
}
void set_dirty() {
more()->state_flags |= DIRTY;
}
void clear_dirty() {
if (have_more()) {
_more->state_flags &= ~DIRTY;
}
}
};
#endif
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