#ifndef _FS_H
#define _FS_H

#include <stdint.h>
#include <sys/types.h>

#define NRSUPER 8
#define NRFILE 128
#define NROPEN 32

/* these shouldn't change */
#define BLOCK_SIZE 1024
#define SUPER_MAGIC 0x137F

struct file {
  uint16_t f_mode;
  uint16_t f_flags;
  struct m_inode *f_inode;
  off_t f_pos;
};

struct super_block {
  uint16_t s_ninodes;
  uint16_t s_nzones;
  uint16_t s_imap_blocks;
  uint16_t s_zmap_blocks;
  uint16_t s_firstdatazone;
  uint16_t s_log_zone_size;
  uint32_t s_max_size;
  uint16_t s_magic;
  /* loaded in memory only */
  struct s_buff *s_imap[8];
  struct s_buff *s_zmap[8];
  uint16_t s_dev;
  uint16_t s_dirt;
  uint16_t s_start;
  uint16_t s_super;
  uint16_t s_imap_off;
  uint16_t s_zmap_off;
  uint16_t s_inode_off;
} __attribute__((packed));

struct m_inode {
  uint16_t i_mode;
  uint16_t i_uid;
  uint32_t i_size;
  uint32_t i_mtime;
  uint8_t i_gid;
  uint8_t i_nlinks;
  uint16_t i_zone[9];
} __attribute__((packed));

struct buffer {
  void *b_data;
  int b_present;
  uint16_t b_device;
  uint16_t b_block;
  struct task_struct *b_wait;
  struct buffer *b_next;
  struct buffer *b_prev;
};

extern struct super_block sblocks[NRSUPER];

void block_read(struct buffer*);
void block_write(struct buffer*);

struct buffer *buffer_get_block(uint16_t, uint16_t);

void mount_root(void);

void fs_init(void);

/* various init functions called by fs_init() */
void buffer_init(void);

#endif