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/*
* cow.h
*
* Created on: 22.08.2018
* Author: Michael Scherle
*/
#ifndef COW_H_
#define COW_H_
#include <stddef.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include "../shared/fdsignal.h"
typedef struct cow_request{
struct cow_request *next;
off_t offset;
off_t end;
struct cow_request *dependencies[6];
struct cow_request *myDependencies[6];
dnbd3_signal_t* signal;
} cow_request;
typedef struct {
uint32_t version;
uint64_t imageSize;
uint32_t nameLenght;
uint32_t pageSize;
} cow_metadata;
bool cow_createFile(char *cow_path, char *image_Name,uint64_t imageSize);
bool createBigBlock(unsigned long id);
int cow_read(char *buf, size_t size, off_t offset);
uint64_t cow_loadFile( char *cow_path, uint64_t imageSize );
int readBigBlock(long bigBlockId ,char *buf,size_t size, off_t offset);
void onClose();
cow_request getAccess(off_t offset,size_t size);
void closeAcccess(cow_request *request);
int write_cow(const char *data, size_t size, off_t offset);
int writeToBigBlock(unsigned long bigBlockId,const char *data, off_t offset,size_t size);
int getSmallBlockId(off_t offset);
void test();
#endif /* COW_H_ */
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