A simple file system running on user space
- read file
- write file
- truncate file
- ls: view attrs
- chown, chmod
- directory operations ( to do )
- TOTAL SIZE: 4G
- BLOCKSIZE: 4KB
- BLOCKNR : 4G/4KB
- NAME_LENGTH: 256
- block_no_t: int (the type of block_no)
- Each block has a block_no at the begining
struct super_node
{
block_no_t block_no;
block_no_t used_block;
block_no_t last_block;
block_no_t blocknr;
unsigned namelen;
unsigned blocksize;
struct entry_node * next;
};block 0( aka mem[0]) is the super block.
It stores the num of used_blocks and the num of the latest used block.
The latest used block is exactly the head block of the node-chain
metadata of each entry( dir or file) stored in mem blocks including :
- int block_no : num of mem block
- int content : is the value of the first mem block_no of the files's content( for dir, it's -1)
- stat st : st of each entry
- filenode* next: next node
- char name[256]: entry name
At the begining, this node stores block_no The following are file data content
next fit
