descriptors_table.h

Go to the documentation of this file.

#ifndef EXT_FILESYSTEM_CORE_DESCRIPTORS_TABLE_H_
#define EXT_FILESYSTEM_CORE_DESCRIPTORS_TABLE_H_
#include <stdint.h>
#include <stdbool.h>
#include <unistd.h>
#include "superblock.h"

struct __attribute__((__packed__)) descriptors_table {
  bool* reserved_fd;
  uint16_t* fd_to_inode;
  uint32_t* fd_to_position;
};

void init_descriptors_table(struct descriptors_table* descriptors_table,
                            const struct superblock* superblock);

void destruct_descriptors_table(struct descriptors_table* descriptors_table,
                                const struct superblock* superblock);

ssize_t read_descriptors_table(int fd,
                               struct descriptors_table* descriptors_table,
                               const struct superblock* superblock);

ssize_t write_descriptor_table(int fd,
                               struct descriptors_table* descriptors_table,
                               const struct superblock* superblock);

int reserve_descriptor(struct descriptors_table* descriptors_table,
                       uint16_t inode_id,
                       const struct superblock* superblock);

int free_descriptor(struct descriptors_table* descriptors_table,
                    uint16_t fd,
                    const struct superblock* superblock);

uint16_t sizeof_descriptors_table(const struct superblock* superblock);

#endif //EXT_FILESYSTEM_CORE_DESCRIPTORS_TABLE_H_