include/linux/flash_ts.h

/*
 * Flash-based transactional key-value store
 *
 * Copyright (C) 2010 Google, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 */
#ifndef _LINUX_FLASH_TS_H_
#define _LINUX_FLASH_TS_H_

#include <asm/ioctl.h>
#include <asm/types.h>

#define FLASH_TS_MAX_KEY_SIZE	64
#define FLASH_TS_MAX_VAL_SIZE	2048

struct flash_ts_io_req {
	char key[FLASH_TS_MAX_KEY_SIZE];
	char val[FLASH_TS_MAX_VAL_SIZE];
};

#define FLASH_TS_IO_MAGIC   0xFE
#define FLASH_TS_IO_SET     _IOW(FLASH_TS_IO_MAGIC, 0, struct flash_ts_io_req)
#define FLASH_TS_IO_GET     _IOWR(FLASH_TS_IO_MAGIC, 1, struct flash_ts_io_req)
#define FLASH_TS_IO_REINIT  _IOR(FLASH_TS_IO_MAGIC, 2, struct flash_ts_io_req)
#define FLASH_TS_IO_CHECK   _IOR(FLASH_TS_IO_MAGIC, 3, struct flash_ts_io_req)

#ifdef __KERNEL__
#include <linux/errno.h>

#if defined CONFIG_FLASH_TS || defined CONFIG_EMMC_TS
/* Get/set value, returns 0 on success */
int flash_ts_set(const char *key, const char *value);
void flash_ts_get(const char *key, char *value, unsigned int size);
#else
static inline int flash_ts_set(const char *key, const char *value)
{
	return -ENOSYS;
}
static inline void flash_ts_get(const char *key, char *value, unsigned int size)
{
}
#endif

#endif  /* __KERNEL__ */
#endif  /* _LINUX_FLASH_TS_H_ */