file.h

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#ifndef FILESYS_FILE_H
#define FILESYS_FILE_H
 
#include "filesys/off_t.h"
 
struct inode;
 
/* Opening and closing files. */
struct file *file_open (struct inode *);
struct file *file_reopen (struct file *);
struct file *file_duplicate (struct file *file);
void file_close (struct file *);
struct inode *file_get_inode (struct file *);
 
/* Reading and writing. */
off_t file_read (struct file *, void *, off_t);
off_t file_read_at (struct file *, void *, off_t size, off_t start);
off_t file_write (struct file *, const void *, off_t);
off_t file_write_at (struct file *, const void *, off_t size, off_t start);
 
/* Preventing writes. */
void file_deny_write (struct file *);
void file_allow_write (struct file *);
 
/* File position. */
void file_seek (struct file *, off_t);
off_t file_tell (struct file *);
off_t file_length (struct file *);
 
#endif /* filesys/file.h */