forked from PoliEcho-holding-org/kern
92 lines
2.2 KiB
C
92 lines
2.2 KiB
C
#ifndef FS_H
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#define FS_H
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#include <stdint.h>
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#define FS_BLOCK_SIZE 4096
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#define FS_SECTOR_SIZE 512
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#define FILETYPE_FILE 0
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#define FILETYPE_DIR 1
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// Filesystem structures
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typedef struct {
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uint8_t second;
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uint8_t minute;
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uint8_t hour;
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uint8_t day;
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uint8_t month;
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uint16_t year;
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uint8_t reserved;
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} __attribute__ ((packed)) fsDatetime_t;
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typedef struct {
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uint8_t sectors[FS_BLOCK_SIZE / FS_SECTOR_SIZE][FS_SECTOR_SIZE];
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} __attribute__ ((packed)) bootBlock_t;
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typedef struct {
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uint32_t inodeCount;
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uint16_t firstInodeBitmapBlock;
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uint16_t firstDataBitmapBlock;
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uint16_t inodeBitmapBlockCount;
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uint16_t dataBitmapBlockCount;
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uint32_t firstInodeBlock;
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uint32_t firstDataBlock;
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uint16_t inodeBlockCount;
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uint16_t dataBlockCount;
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uint32_t maxFileSize; // in bytes
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uint16_t blockSize; // in bytes
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uint8_t inodeSize; // in bytes
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uint32_t rootInodePtr;
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uint8_t inodesPerBlock;
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uint8_t directExtentsPerInode;
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uint16_t extentsPerIndirectBlock;
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uint32_t firstFreeInodeBit;
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uint32_t firstFreeDataBit;
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uint16_t deviceNumber;
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uint8_t firstUnreservedInode;
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uint8_t reserved[14];
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} __attribute__ ((packed)) superBlock_t;
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typedef struct {
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uint32_t firstBlock;
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uint32_t length;
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} __attribute__ ((packed)) extent_t;
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typedef struct {
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uint32_t id; // Idetifier
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uint8_t filetype;
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uint32_t sizeBytes;
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uint32_t sizeSectors;
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fsDatetime_t timestamp;
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extent_t extent[4];
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uint32_t singleIndirectBlock;
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uint32_t doubleIndirectBlock;
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uint8_t refCount;
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uint8_t reserved[2];
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} __attribute__ ((packed)) inode_t;
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typedef struct {
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uint32_t id; // Matching ID with INode
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char name[60];
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} __attribute__ ((packed)) dirEntry_t;
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// Utility functions
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uint32_t bytesToBlocks(uint32_t bytes) {
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if (bytes == 0) return 0;
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if (bytes <= FS_BLOCK_SIZE) return 1;
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return (bytes / FS_BLOCK_SIZE) + ((bytes % FS_BLOCK_SIZE) > 0 ? 1 : 0);
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}
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uint32_t bytesToSectors(uint32_t bytes) {
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if (bytes == 0) return 0;
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if (bytes <= FS_SECTOR_SIZE) return 1;
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return (bytes / FS_SECTOR_SIZE) + ((bytes % FS_SECTOR_SIZE) > 0 ? 1 : 0);
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}
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#endif
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