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/*
* File: embfs.hpp
* Purpose: Embedded File System.
* Author: Amlal El Mahrouss (amlal@nekernel.org)
* Copyright 2025, Amlal El Mahrouss.
*/
#ifndef _OCL_EMBFS_HPP
#define _OCL_EMBFS_HPP
#include <cstdint>
#include <cstddef>
/// @brief A filesystem designed for tiny storage medias.
/// @author Amlal EL Mahrouss (amlal@nekernel.org)
namespace ocl::embfs
{
namespace traits
{
struct embfs_superblock;
struct embfs_inode;
inline constexpr const size_t _superblock_name_len = 16;
inline constexpr const size_t _superblock_reserve_len = 462;
inline constexpr const size_t _inode_name_len = 128;
inline constexpr const size_t _inode_arr_len = 12;
inline constexpr const size_t _inode_lookup_len = 8;
#if defined(EMBFS_28BIT_LBA)
typedef std::uint32_t lba_t;
#elif defined(EMBFS_48BIT_LBA)
typedef std::uint64_t lba_t;
#else
typedef std::uint32_t lba_t;
#endif
typedef std::int16_t sword_t;
typedef std::int32_t sdword_t;
typedef std::uint8_t utf8_char_t;
/// @brief Superblock data structure
struct embfs_superblock
{
sword_t s_block_mag;
sdword_t s_num_inodes;
sdword_t s_part_size;
sdword_t s_part_used;
sdword_t s_version;
sword_t s_sector_sz;
lba_t s_inode_start;
lba_t s_inode_end;
utf8_char_t s_name[_superblock_name_len];
utf8_char_t s_reserved[_superblock_reserve_len];
};
/// @brief Indexed node structure.
/// @brief i_name file name
/// @brief i_size_virt, i_size_phys: virtual and physical (sector count) size.
/// @brief i_offset direct block pointer.
/// @brief i_checksum crc32 checksum.
/// @brief i_flags_perms flags and permissions
/// @brief i_acl_* ACL to keep track of inode allocation status.
struct embfs_inode
{
utf8_char_t i_name[_inode_name_len];
sword_t i_size_virt, i_size_phys;
lba_t i_offset[_inode_lookup_len];
sword_t i_checksum, i_flags_perms;
lba_t i_acl_creat, i_acl_edit, i_acl_delet;
};
/// @brief Indexed node linear array.
typedef embfs_inode embfs_inode_arr_t[_inode_arr_len];
} // namespace traits
} // namespace ocl::embfs
#endif // ifndef _OCL_EMBFS_HPP
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