#ifndef VM_MMAP_H
#define VM_MMAP_H

#include <hash.h>
#include "threads/thread.h"
#include "filesys/file.h"

/* A mapping identifier type. */
typedef unsigned mapid_t;

/* A structure to represent a memory mapped file. */
struct mmap_entry {
  mapid_t mapping;      /* The mapping identifier of the mapped file. */
  struct file *file;    /* A pointer to the file that is being mapped. */
  void *upage;          /* The start address of the file data in the user VM. */

  struct hash_elem elem; /* An elem for the hash table. */
};

bool mmap_init (struct thread *t);
struct mmap_entry *mmap_get (mapid_t mapping);
struct mmap_entry *mmap_insert (struct file *file, void *upage);
void mmap_unmap (struct mmap_entry *mmap);
void mmap_umap_all (void);
void mmap_destroy (void);

#endif /* vm/mmap.h */