/**
 * @file
// ext2 in-ram  minidriver
// =======================
//
// based on osdev wiki article: http://wiki.osdev.org/Ext2
// root directory is inode 2 per definition!
// we do not care about files >4gb (no triply linked lists and no size_high)
// we also use only name_length_low so max length is 255 chars
//
// The ext2 data needs to be mapped to a continues ram area (possibly via paging)
// The __ramext2_start_addr__ determines the start of the area in each of the provided 
// functions.
*/

#include  <stdint.h>
#include "fs.h"

/** klog some basic info about the ext2 fs */
void ext2_dump_info(uint32_t ext2_start_addr);

/** read up to max characters into buffer from given inode and set __pos__ */
uint32_t ext2_read_inode(uint32_t ext2_start_addr, int inode_nr, char *buf, uint32_t *pos, uint32_t max_size);

/** Simiilar to ext2_read_inode but for directory inodes. 
 * the inode number needs to point to a directory inode 
 * fills on fs_dirent and sets _pos_ to the position of the next
 */
int ext2_read_dir(uint32_t ext2_start_addr, int inode_nr, fs_dirent *dirs, uint32_t *pos);

/** get inode number from file path / if not found return 0 */
uint32_t ext2_filename_to_inode(uint32_t ext2_start_addr, char *path);

/** get address of first byte of given block for given inode number */
uint32_t ext2_inode_blockstart(uint32_t ext2_start_addr,uint32_t inode_nr,uint32_t block);