emmafs/inode.h

#ifndef INODE_H_
#define INODE_H_

#include "emmafs.h"
#include "util.h"

typedef struct Inode Inode;

enum permissions {
    READ = 1,
    WRITE = 2,
    EXECUTE = 4
};

// TODO: Add handling for the block bitmap for when a file is deleted and created. That's how you solve the issue of when a block is usable.

struct Inode {
    // file information
    char *filename;
    uint32_t filesize;

    // ownership and permissions
    uint8_t user_permissions;
    uint8_t group_permissions;

    // UID
    uint16_t owner;
    // GID
    uint16_t group;

    // timestamps
    tm created;
    tm last_modified;

    // needed to determine file size
    uint16_t block_count;

    // Data block pointers!!
    struct data_block* first_data_block;
    struct data_block* second_data_block;
    struct data_block* third_data_block;
    struct data_block* fourth_data_block;
    struct data_block* fifth_data_block;
    struct data_block* sixth_data_block;
    struct data_block* seventh_data_block;
    struct data_block* eighth_data_block;
    struct data_block* nineth_data_block;
    struct data_block* tenth_data_block;
    struct data_block* eleventh_data_block;
    struct data_block* twelveth_data_block;
    struct indirect_data_block* file_indirect_data_block;
    struct doubly_indirect_data_block* file_doubly_indirect_data_block;
    struct trebly_indirect_data_block* file_trebly_indirect_data_block;
};

struct inode_table {
    // the following keyword spam purely exist so I definitely see it with highlighting.
    // NOTE, TODO, FIXME, DEPRECATED, HACK, IMPORTANT: always initialize all values to be null when the inode table is created!!!!
    // TODO: Change currently hardcoded value to actually accurately describe the size of the filesystem, only for temporary purposes.
    Inode inodes[640000];
    uint32_t size;
    uint32_t used_inodes;
    uint32_t free_inodes;
};

Inode* create_inode();
Inode* find_inode(char filename[], struct inode_table* itable);
bool inode_exists(struct inode_table* itable, char filename[]);
void delete_inode(struct inode_table* itable, char filename[]);

#endif // INODE_H_