diff options
Diffstat (limited to 'fs/ext2.h')
| -rw-r--r-- | fs/ext2.h | 33 |
1 files changed, 27 insertions, 6 deletions
@@ -1,14 +1,35 @@ /** * @file -// ext2 minidriver +// 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" +#include "fs.h" -int ext2_check(uint8_t *ram); -int ext2_inode_content(char *ram,int inode_nr,uint8_t *ramdest,int max); -int ext2_read_dir(uint8_t *ram, int inode_nr,fs_dirent *dirs,int max); -int ext2_filename_to_inode(uint8_t *ram, char *path); +/** 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); |