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/***************************************************************************
* Copyright (C) 2010 by Roberto Maar *
* robi@users.berlios.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, see <http://www.gnu.org/licenses/>. *
***************************************************************************/
// A special doubly linked ringbuffer for manage journalinode
#ifndef RING_BUF_H
#define RING_BUF_H
/* ext3/4 libraries */
#include <ext2fs/ext2fs.h>
typedef struct transaction_range{
__u32 start;
__u32 end;
} trans_range_t;
struct ring_buf_item {
struct ring_buf_item *prev;
struct ring_buf_item *next;
struct ext2_inode_large *inode;
trans_range_t transaction;
};
struct ring_buf {
struct ring_buf_item * begin;
int count;
int i_size;
__u32 nr;
char del_flag;
char reuse_flag;
};
typedef struct ring_buf_item r_item;
static inline r_item* r_first(struct ring_buf *head){
return (head->count) ? head->begin : NULL ;}
static inline r_item* r_last(struct ring_buf *head){
return (head->count) ? head->begin->prev : NULL ; }
static inline r_item* r_next(r_item *item){
return item->next;}
static inline r_item* r_prev(r_item *item){
return item->prev;}
static inline int r_get_count(struct ring_buf *head){
return head->count;}
r_item* r_item_new( int );
struct ring_buf* ring_new( int , __u32);
r_item* r_item_add(struct ring_buf*);
void ring_del(struct ring_buf*);
r_item* r_begin(struct ring_buf*);
#endif
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