evgenabramov/MIPT-Linux-MiniFS

minifs - simple file system

Tiny model of ext2 file system. You can specify file to store minifs data by script argument. Default value - filesystem. If script stops, all data is saved in this file and can be restored by next execution.

Note: all paths should start with '/'. Initially only '/' path exists.

Available commands:

• touch <path> — creates empty file at path
• mkdir <path> — creates empty directory at path
• ls <path> — lists all files in directory at path
• rm <path> — remove file at path
• rmdir <path> — remove directory at path
• get <global_path> <minifs_path> — copy file from outer file system to minifs
• put <minifs_path> <global_path> — copy file from minifs to outer file system
• cat <path> — output file at path

How to build & execute

CMake/Pure Makefile

mkdir build; cd build
cmake ..
make
./minifs

Examples:

(script started at build directory)

Welcome to MiniFS!
>>> touch /file1
>>> touch /file2
>>> mkdir /dir1
>>> ls /
/
file1
file2
dir1
>>> mkdir /dir1/dir2
>>> touch /dir1/dir2/file3
>>> mkdir /dir1/dir2/dir3
>>> ls /dir1/dir2
file3
dir3
>>> rm /dir1
>>> ls /
/
file1
file2
>>> get ../test_get_put.txt /file3
>>> ls /
/
file1
file2
file3
>>> cat /file3
#include <stdio.h>
#include <stdint.h>

struct dir_enitry {
    uint16_t inode_index;
    char name[14];
} __attribute__((__packed__));

int main() {
    printf("%ld\n", sizeof(struct dir_entry));
    printf("0x%01X\n", 'a');
    printf("0x%01X\n", 'b');
    return 0;
}>>> put /file3 outer.c