wsl2 ubuntu22.04
rust version nightly-2024-06-01
rustc 1.80.0-nightly (ada5e2c7b 2024-05-31)
mkfs.ext4 1.46.5 (30-Dec-2021)
For small images, the newer mkfs.ext4 uses a 512-byte block size. Use mkfs.ext4 -b 4096 to set a 4096-byte block size.
git clone https://github.com/yuoo655/ext4_rs.git
sh run.sh
git clone https://github.com/yuoo655/ext4libtest.git
cd ext4libtest
sh gen_img.sh
# cargo run /path/to/mountpoint
cargo run ./foo/
操作 | 支持情况 |
---|---|
mount | ✅ |
open | ✅ |
close | ✅ |
lsdir | ✅ |
mkdir | ✅ |
read_file | ✅ |
read_link | ✅ |
create_file | ✅ |
write_file | ✅ |
link | ✅ |
unlink | ✅ |
file_truncate | ✅ |
file_remove | ✅ |
umount | ✅ |
dir_remove | ✅ |
#[derive(Debug)]
pub struct Disk {}
impl BlockDevice for Disk {
fn read_offset(&self, offset: usize) -> Vec<u8> {
use std::fs::OpenOptions;
use std::io::{Read, Seek};
let mut file = OpenOptions::new()
.read(true)
.write(true)
.open("ex4.img")
.unwrap();
let mut buf = vec![0u8; BLOCK_SIZE as usize];
let _r = file.seek(std::io::SeekFrom::Start(offset as u64));
let _r = file.read_exact(&mut buf);
buf
}
fn write_offset(&self, offset: usize, data: &[u8]) {
use std::fs::OpenOptions;
use std::io::{Seek, Write};
let mut file = OpenOptions::new()
.read(true)
.write(true)
.open("ex4.img")
.unwrap();
let _r = file.seek(std::io::SeekFrom::Start(offset as u64));
let _r = file.write_all(&data);
}
}
let disk = Arc::new(Disk {});
let ext4 = Ext4::open(disk);
let path = "test_files/0.txt";
let mut read_buf = vec![0u8; READ_SIZE as usize];
let child_inode = ext4.generic_open(path, &mut 2, false, 0, &mut 0).unwrap();
// 1G
let mut data = vec![0u8; 0x100000 * 1024 as usize];
let read_data = ext4.read_at(child_inode, 0 as usize, &mut data);
log::info!("read data {:?}", &data[..10]);
let path = "test_files/linktest";
let mut read_buf = vec![0u8; READ_SIZE as usize];
// 2 is root inode
let child_inode = ext4.generic_open(path, &mut 2, false, 0, &mut 0).unwrap();
let mut data = vec![0u8; 0x100000 * 1024 as usize];
let read_data = ext4.read_at(child_inode, 0 as usize, &mut data);
log::info!("read data {:?}", &data[..10]);
for i in 0..10 {
let path = format!("dirtest{}", i);
let path = path.as_str();
let r = ext4.dir_mk(&path);
assert!(r.is_ok(), "dir make error {:?}", r.err());
}
let path = "dir1/dir2/dir3/dir4/dir5/dir6";
let r = ext4.dir_mk(&path);
assert!(r.is_ok(), "dir make error {:?}", r.err());
// file create/write
let inode_mode = InodeFileType::S_IFREG.bits();
let inode_ref = ext4.create(ROOT_INODE, "511M.txt", inode_mode).unwrap();
// test 511M for 512M we need split the extent tree
const WRITE_SIZE: usize = (0x100000 * 511);
let write_buf = vec![0x41 as u8; WRITE_SIZE];
let r = ext4.write_at(inode_ref.inode_num, 0, &write_buf);
let entries = ext4.dir_get_entries(ROOT_INODE);
log::info!("dir ls root");
for entry in entries {
log::info!("{:?}", entry.get_name());
}
let path = "test_files/file_to_remove";
let r = ext4.file_remove(&path);
let path = "dir_to_remove";
let r = ext4.dir_remove(ROOT_INODE, &path);