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/*
* Block device emulated in a file
*
* Copyright (c) 2017, Arm Limited. All rights reserved.
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef LFS_FILEBD_H
#define LFS_FILEBD_H
#include "lfs.h"
#include "lfs_util.h"
#ifdef __cplusplus
extern "C"
{
#endif
// Block device specific tracing
#ifdef LFS_FILEBD_YES_TRACE
#define LFS_FILEBD_TRACE(...) LFS_TRACE(__VA_ARGS__)
#else
#define LFS_FILEBD_TRACE(...)
#endif
// filebd config (optional)
struct lfs_filebd_config {
// 8-bit erase value to use for simulating erases. -1 does not simulate
// erases, which can speed up testing by avoiding all the extra block-device
// operations to store the erase value.
int32_t erase_value;
};
// filebd state
typedef struct lfs_filebd {
int fd;
const struct lfs_filebd_config *cfg;
} lfs_filebd_t;
// Create a file block device using the geometry in lfs_config
int lfs_filebd_create(const struct lfs_config *cfg, const char *path);
int lfs_filebd_createcfg(const struct lfs_config *cfg, const char *path,
const struct lfs_filebd_config *bdcfg);
// Clean up memory associated with block device
int lfs_filebd_destroy(const struct lfs_config *cfg);
// Read a block
int lfs_filebd_read(const struct lfs_config *cfg, lfs_block_t block,
lfs_off_t off, void *buffer, lfs_size_t size);
// Program a block
//
// The block must have previously been erased.
int lfs_filebd_prog(const struct lfs_config *cfg, lfs_block_t block,
lfs_off_t off, const void *buffer, lfs_size_t size);
// Erase a block
//
// A block must be erased before being programmed. The
// state of an erased block is undefined.
int lfs_filebd_erase(const struct lfs_config *cfg, lfs_block_t block);
// Sync the block device
int lfs_filebd_sync(const struct lfs_config *cfg);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif
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