Espresso/include/fs/duckfs.h

#ifndef _DUCKFS_H
#define _DUCKFS_H

#include <types.h>

#define DUCKFS_MAGIC "DUCKFS1"
#define DUCKFS_NAME_LEN 32

typedef enum { DUCKFS_TYPE_FILE = 0, DUCKFS_TYPE_DIR = 1, DUCKFS_TYPE_SYMLINK = 2 } duckfs_type_t;

typedef struct {
    char name[DUCKFS_NAME_LEN];
    duckfs_type_t type;
    uint8_t permissions;      /* rwxrwxrwx packed into 9 bits  */
    uint16_t uid;
    uint16_t gid;
    uint64_t size;
    uint64_t created;
    uint64_t modified;
    uint64_t first_block_lba;
    uint64_t next_file_lba;
    uint64_t child_lba;       /* only for directories */
} __attribute__((packed)) duckfs_file_header_t;

typedef struct {
    char magic[8];            /* "DUCKFS1\0" */
    uint32_t block_size;
    uint64_t total_blocks;
    uint64_t root_header_lba;
    uint64_t free_list_lba;
    uint32_t fs_version;
} __attribute__((packed)) duckfs_superblock_t;

struct free_block {
    uint64_t next;
};

/* DuckFS API  */
int32_t duckfs_mount(void);

int32_t duckfs_find(const char* path, duckfs_file_header_t* out);

int32_t duckfs_create_file(const char* name, const void* content, size_t size, uint16_t uid, uint16_t gid, uint8_t perms, duckfs_file_header_t* parent_dir);
int32_t duckfs_create_dir(const char* name, uint16_t uid, uint16_t gid, uint8_t perms, duckfs_file_header_t* parent_dir);
int32_t duckfs_delete_file(const char* name, duckfs_file_header_t* parent_dir);
int32_t duckfs_delete_dir(const char* name, duckfs_file_header_t* parent_dir);

int32_t duckfs_read_file(const duckfs_file_header_t* file, void* buffer, size_t size);
int32_t duckfs_write_data(duckfs_file_header_t* file, const void* data, size_t offset, size_t length);
int32_t duckfs_append_data(duckfs_file_header_t* file, const void* data, size_t length);

int32_t duckfs_truncate(duckfs_file_header_t* file, size_t new_size);

#endif