/**
 * @file
 *
 * Simple mount point manager
 * ==========================
 *
 * Add up to MAX_MOUNTS (as defined in kernel.h) mountpoints and use the
 * provided functions to transparently dispatch them to the undelying  
 * infrastructure provided via the mount_struct structures
 *
 * unt_file_open() and mount_read_dir() 
 *
 * The mount directories itself should exist inside the 
 * root direcotry '/'.
 */

#ifndef MOUNT_H
#define MOUNT_H

#include <stdint.h>

#include <sys/dirent.h>   // provides fs_dirent structure for read_dir()
#include "fd.h"             // file descriptor returned by open

/** the possible values for mount_struct.type */
enum MOUNT_TYPE{
    MOUNT_TYPE_EXT2	=	1,
    MOUNT_TYPE_SYS	=	3 
};

/** struct providing all the required info, about a single mountpoint */
typedef struct mount_struct
{
    uint32_t type;    // MOUNT_TYPE

    char path[256];   // where are we mounted (provide leading and trailing slash!)

    fd   (*mount_file_open)(struct mount_struct*, char *path);
    int  (*mount_read_dir) (struct mount_struct*, char *path, struct dirent *dirs, uint32_t *pos);

    void *data;       // pointer to some opaque private data 

}mount;

/** adds a new mountpoints */
void mount_add(mount mnt);

/** dispatchers to according mount points */
fd mount_file_open(char *path);

/** TODO: should use fd number instead of PATH on each call*/
int  mount_read_dir (char *path, struct dirent *dirs, uint32_t *pos);

/** sysfs interface / exposing status via /sysfs/ file */
void mount_sysfs(ringbuffer *r, void (*f)(ringbuffer *r,char *fmt, ...));

#endif