Initial commit
This commit is contained in:
commit
e205e31797
GPG Key ID:
7B5F6AFBEC7EE78E
5
.cargo/config.toml
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5
.cargo/config.toml
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@ -0,0 +1,5 @@
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[build]
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target = "x86_64-unknown-mikros"
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[install]
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||||||
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root = "../os_build/sysroot"
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||||||
1
.gitignore
vendored
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1
.gitignore
vendored
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@ -0,0 +1 @@
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/target
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427
Cargo.lock
generated
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427
Cargo.lock
generated
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@ -0,0 +1,427 @@
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# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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||||||
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version = 3
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||||||
|
name = "syslog_structs"
|
||||||
|
version = "0.1.0"
|
||||||
|
dependencies = [
|
||||||
|
"serde",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "unicode-ident"
|
||||||
|
version = "1.0.12"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "vfs_rpc"
|
||||||
|
version = "0.1.0"
|
||||||
|
dependencies = [
|
||||||
|
"parking_lot",
|
||||||
|
"postcard",
|
||||||
|
"serde",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows-targets"
|
||||||
|
version = "0.52.6"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
|
||||||
|
dependencies = [
|
||||||
|
"windows_aarch64_gnullvm",
|
||||||
|
"windows_aarch64_msvc",
|
||||||
|
"windows_i686_gnu",
|
||||||
|
"windows_i686_gnullvm",
|
||||||
|
"windows_i686_msvc",
|
||||||
|
"windows_x86_64_gnu",
|
||||||
|
"windows_x86_64_gnullvm",
|
||||||
|
"windows_x86_64_msvc",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_aarch64_gnullvm"
|
||||||
|
version = "0.52.6"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_aarch64_msvc"
|
||||||
|
version = "0.52.6"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_i686_gnu"
|
||||||
|
version = "0.52.6"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_i686_gnullvm"
|
||||||
|
version = "0.52.6"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_i686_msvc"
|
||||||
|
version = "0.52.6"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_x86_64_gnu"
|
||||||
|
version = "0.52.6"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_x86_64_gnullvm"
|
||||||
|
version = "0.52.6"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_x86_64_msvc"
|
||||||
|
version = "0.52.6"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
|
||||||
13
Cargo.toml
Normal file
13
Cargo.toml
Normal file
@ -0,0 +1,13 @@
|
|||||||
|
[package]
|
||||||
|
name = "ext2"
|
||||||
|
version = "0.1.0"
|
||||||
|
edition = "2021"
|
||||||
|
|
||||||
|
[dependencies]
|
||||||
|
binread = "2.2.0"
|
||||||
|
file_rpc = { version = "0.1.0", path = "../file_rpc" }
|
||||||
|
fs_rpc = { version = "0.1.0", path = "../fs_rpc" }
|
||||||
|
itertools = "0.13.0"
|
||||||
|
parking_lot = "0.12.3"
|
||||||
|
syslog_rpc = { version = "0.1.0", path = "../syslog/syslog_rpc" }
|
||||||
|
vfs_rpc = { version = "0.1.0", path = "../vfs/vfs_rpc" }
|
||||||
2
rust-toolchain.toml
Normal file
2
rust-toolchain.toml
Normal file
@ -0,0 +1,2 @@
|
|||||||
|
[toolchain]
|
||||||
|
channel = "dev-x86_64-unknown-mikros"
|
||||||
80
src/ext2.rs
Normal file
80
src/ext2.rs
Normal file
@ -0,0 +1,80 @@
|
|||||||
|
mod block_group_table;
|
||||||
|
mod block_reader;
|
||||||
|
mod dir;
|
||||||
|
mod file;
|
||||||
|
mod metadata;
|
||||||
|
mod structs;
|
||||||
|
|
||||||
|
use block_group_table::BlockGroupDescriptorTable;
|
||||||
|
use block_reader::BlockReader;
|
||||||
|
use parking_lot::RwLock;
|
||||||
|
use std::collections::HashMap;
|
||||||
|
use std::io;
|
||||||
|
use std::path::{Path, PathBuf};
|
||||||
|
use structs::{DirEntryDisk, Inode, Superblock};
|
||||||
|
|
||||||
|
pub use dir::ReadDir;
|
||||||
|
pub use file::File;
|
||||||
|
pub use metadata::Metadata;
|
||||||
|
use std::fs::File as StdFile;
|
||||||
|
|
||||||
|
#[derive(Debug)]
|
||||||
|
pub struct Ext2 {
|
||||||
|
reader: BlockReader,
|
||||||
|
descriptor_table: BlockGroupDescriptorTable,
|
||||||
|
inode_cache: RwLock<HashMap<u32, Inode>>,
|
||||||
|
dentry_cache: RwLock<HashMap<PathBuf, DirEntryDisk>>,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Ext2 {
|
||||||
|
pub fn new(mut disk: StdFile) -> io::Result<Self> {
|
||||||
|
let superblock = Superblock::read_from_disk(&mut disk)?;
|
||||||
|
let reader = BlockReader::new(disk, &superblock);
|
||||||
|
Ok(Self {
|
||||||
|
descriptor_table: BlockGroupDescriptorTable::new(&superblock, &reader)?,
|
||||||
|
reader,
|
||||||
|
inode_cache: RwLock::new(HashMap::new()),
|
||||||
|
dentry_cache: RwLock::new(HashMap::new()),
|
||||||
|
})
|
||||||
|
}
|
||||||
|
|
||||||
|
fn path_inode<P: AsRef<Path>>(&self, path: P) -> io::Result<u32> {
|
||||||
|
let path = path.as_ref();
|
||||||
|
let dentry = { self.dentry_cache.read().get(path).cloned() };
|
||||||
|
if let Some(dentry) = dentry {
|
||||||
|
//println!("Dentry {}: In cache", path.display());
|
||||||
|
Ok(dentry.inode)
|
||||||
|
} else if let Some(parent) = path.parent() {
|
||||||
|
//println!("Dentry {}: Not in cache", path.display());
|
||||||
|
let file_name = path.file_name().ok_or_else(|| {
|
||||||
|
io::Error::new(
|
||||||
|
io::ErrorKind::Other,
|
||||||
|
"A path ending in .. or . was passed to path_inode",
|
||||||
|
)
|
||||||
|
})?;
|
||||||
|
let dir_inode = self.path_inode(parent)?;
|
||||||
|
let dir = ReadDir::read_inode(self, dir_inode, parent.to_owned())?;
|
||||||
|
let entry = dir.get_entry(file_name)?;
|
||||||
|
Ok(entry.inode)
|
||||||
|
} else {
|
||||||
|
Ok(2)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[allow(unused)]
|
||||||
|
pub fn read_dir<P: AsRef<Path>>(&self, path: P) -> io::Result<ReadDir> {
|
||||||
|
let path = path.as_ref();
|
||||||
|
let inode = self.path_inode(path)?;
|
||||||
|
ReadDir::read_inode(self, inode, path.to_owned())
|
||||||
|
}
|
||||||
|
|
||||||
|
#[allow(unused)]
|
||||||
|
pub fn open<P: AsRef<Path>>(&self, path: P) -> io::Result<File> {
|
||||||
|
File::from_inode(Inode::read(self, self.path_inode(path)?)?, self)
|
||||||
|
}
|
||||||
|
|
||||||
|
#[allow(unused)]
|
||||||
|
pub fn metadata<P: AsRef<Path>>(&self, path: P) -> io::Result<Metadata> {
|
||||||
|
Inode::read(self, self.path_inode(path)?).map(|x| Metadata::from_inode(&x))
|
||||||
|
}
|
||||||
|
}
|
||||||
83
src/ext2/block_group_table.rs
Normal file
83
src/ext2/block_group_table.rs
Normal file
@ -0,0 +1,83 @@
|
|||||||
|
use super::{
|
||||||
|
block_reader::BlockReader,
|
||||||
|
structs::{BlockGroupDescriptor, Inode, Superblock},
|
||||||
|
};
|
||||||
|
use binread::prelude::*;
|
||||||
|
use std::io;
|
||||||
|
use std::vec::Vec;
|
||||||
|
|
||||||
|
const INODE_SIZE: usize = 256;
|
||||||
|
|
||||||
|
#[derive(Debug, BinRead)]
|
||||||
|
#[br(import(len: usize, block_group_inode_count: u32, block_size: usize))]
|
||||||
|
pub struct BlockGroupDescriptorTable {
|
||||||
|
#[br(count = len)]
|
||||||
|
table: Vec<BlockGroupDescriptor>,
|
||||||
|
#[br(calc = block_group_inode_count)]
|
||||||
|
block_group_inode_count: u32,
|
||||||
|
#[br(calc = block_size)]
|
||||||
|
block_size: usize,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl BlockGroupDescriptorTable {
|
||||||
|
pub fn new(superblock: &Superblock, reader: &BlockReader) -> io::Result<Self> {
|
||||||
|
let num_block_groups = superblock
|
||||||
|
.total_blocks
|
||||||
|
.div_ceil(superblock.block_group_block_count) as usize;
|
||||||
|
let table_blocks = num_block_groups.div_ceil(reader.block_size / 32);
|
||||||
|
Ok(reader
|
||||||
|
.read_blocks(superblock.superblock_block + 1, table_blocks)?
|
||||||
|
.read_le_args((
|
||||||
|
num_block_groups,
|
||||||
|
superblock.block_group_inode_count,
|
||||||
|
1024 << superblock.block_size_raw,
|
||||||
|
))
|
||||||
|
.expect("Parsing the block group descriptor table should never fail"))
|
||||||
|
}
|
||||||
|
|
||||||
|
fn inode_group(&self, inode: u32) -> &BlockGroupDescriptor {
|
||||||
|
&self.table[((inode - 1) / self.block_group_inode_count) as usize]
|
||||||
|
}
|
||||||
|
|
||||||
|
fn inode_group_offset(&self, inode: u32) -> usize {
|
||||||
|
((inode - 1) % self.block_group_inode_count) as usize
|
||||||
|
}
|
||||||
|
|
||||||
|
fn inode_block(&self, inode: u32) -> u32 {
|
||||||
|
(((self.inode_group_offset(inode) * INODE_SIZE) / self.block_size) as u32)
|
||||||
|
+ self.inode_group(inode).inode_table_start
|
||||||
|
}
|
||||||
|
|
||||||
|
fn inode_block_byte_start(&self, inode: u32) -> usize {
|
||||||
|
(self.inode_group_offset(inode) * INODE_SIZE) % self.block_size
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn inode_loc(&self, inode: u32) -> InodeLoc {
|
||||||
|
InodeLoc {
|
||||||
|
block: self.inode_block(inode),
|
||||||
|
byte_offset: self.inode_block_byte_start(inode),
|
||||||
|
num: inode,
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug)]
|
||||||
|
pub struct InodeLoc {
|
||||||
|
block: u32,
|
||||||
|
byte_offset: usize,
|
||||||
|
num: u32,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl InodeLoc {
|
||||||
|
pub fn read(&self, reader: &BlockReader) -> io::Result<Inode> {
|
||||||
|
//println!("InodeLoc::read");
|
||||||
|
reader
|
||||||
|
.read_block_offset(self.block, self.byte_offset as u32)?
|
||||||
|
.read_le_args((self.num,))
|
||||||
|
.map_err(|err| match err {
|
||||||
|
binread::Error::Io(_) => io::Error::new(io::ErrorKind::Other, "Binread IO error"),
|
||||||
|
_ => io::Error::new(io::ErrorKind::InvalidData, "Inode data was invalid"),
|
||||||
|
})
|
||||||
|
//println!("InodeLoc::read done");
|
||||||
|
}
|
||||||
|
}
|
||||||
52
src/ext2/block_reader.rs
Normal file
52
src/ext2/block_reader.rs
Normal file
@ -0,0 +1,52 @@
|
|||||||
|
use std::vec::Vec;
|
||||||
|
|
||||||
|
use super::structs::Superblock;
|
||||||
|
use std::fs::File as StdFile;
|
||||||
|
use std::io::{self, Cursor, Read, Seek, SeekFrom};
|
||||||
|
|
||||||
|
#[derive(Debug)]
|
||||||
|
pub struct BlockReader {
|
||||||
|
pub disk: StdFile,
|
||||||
|
pub block_size: usize,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl BlockReader {
|
||||||
|
pub fn new(disk: StdFile, superblock: &Superblock) -> Self {
|
||||||
|
Self {
|
||||||
|
disk,
|
||||||
|
block_size: 1024 << superblock.block_size_raw,
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn read_block(&self, block: u32) -> io::Result<Cursor<Vec<u8>>> {
|
||||||
|
//println!("Read block {}", block);
|
||||||
|
let mut disk = &self.disk;
|
||||||
|
let start = self.block_to_byte_offset(block);
|
||||||
|
let size = self.block_size;
|
||||||
|
let mut vec = vec![0; size];
|
||||||
|
disk.seek(SeekFrom::Start(start))?;
|
||||||
|
disk.read_exact(&mut vec)?;
|
||||||
|
Ok(Cursor::new(vec))
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn read_block_offset(&self, block: u32, offset: u32) -> io::Result<Cursor<Vec<u8>>> {
|
||||||
|
let block = self.read_block(block)?.into_inner();
|
||||||
|
let trunc_block = block[(offset as usize)..].to_vec();
|
||||||
|
Ok(Cursor::new(trunc_block))
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn read_blocks(&self, block: u32, count: usize) -> io::Result<Cursor<Vec<u8>>> {
|
||||||
|
let mut vec = vec![0; self.block_size * count];
|
||||||
|
for block_no in block..(block + count as u32) {
|
||||||
|
let data = self.read_block(block)?.into_inner();
|
||||||
|
vec[((block_no - block) as usize * self.block_size)
|
||||||
|
..(((block_no - block) as usize + 1) * self.block_size)]
|
||||||
|
.copy_from_slice(&data);
|
||||||
|
}
|
||||||
|
Ok(Cursor::new(vec))
|
||||||
|
}
|
||||||
|
|
||||||
|
fn block_to_byte_offset(&self, block: u32) -> u64 {
|
||||||
|
u64::from(block) * (self.block_size as u64)
|
||||||
|
}
|
||||||
|
}
|
||||||
170
src/ext2/dir.rs
Normal file
170
src/ext2/dir.rs
Normal file
@ -0,0 +1,170 @@
|
|||||||
|
use super::{
|
||||||
|
file::{File, FileReader},
|
||||||
|
metadata::{FileType, Metadata},
|
||||||
|
structs::{DirEntryDisk, Inode},
|
||||||
|
Ext2,
|
||||||
|
};
|
||||||
|
use std::string::String;
|
||||||
|
use std::{ffi::OsStr, io, os::mikros::ffi::OsStrExt};
|
||||||
|
use std::{io::BufReader, path::PathBuf};
|
||||||
|
|
||||||
|
/// Entries returned by the [`ReadDir`] iterator.
|
||||||
|
///
|
||||||
|
/// An instance of `DirEntry` represents an entry inside of a directory on the
|
||||||
|
/// filesystem. Each entry can be inspected via methods to learn about the full
|
||||||
|
/// path or possibly other metadata through per-platform extension traits.
|
||||||
|
#[allow(unused)]
|
||||||
|
#[allow(clippy::module_name_repetitions)]
|
||||||
|
pub struct DirEntry<'a> {
|
||||||
|
pub(super) inode: u32,
|
||||||
|
pub(super) name: String,
|
||||||
|
pub(super) metadata: Metadata,
|
||||||
|
pub(super) directory_path: PathBuf,
|
||||||
|
fs: &'a Ext2,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl<'a> core::fmt::Debug for DirEntry<'a> {
|
||||||
|
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
|
||||||
|
f.debug_struct("DirEntry")
|
||||||
|
.field("inode", &self.inode)
|
||||||
|
.field("name", &self.name)
|
||||||
|
.field("metadata", &self.metadata)
|
||||||
|
.field("directory_path", &self.directory_path)
|
||||||
|
.finish()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[allow(unused)]
|
||||||
|
impl<'a> DirEntry<'a> {
|
||||||
|
/// Returns the bare file name of this directory entry without any other
|
||||||
|
/// leading path component.
|
||||||
|
pub fn file_name(&self) -> String {
|
||||||
|
self.name.clone()
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns the file type for the file that this entry points at.
|
||||||
|
///
|
||||||
|
/// This function will not traverse symlinks if this entry points at a
|
||||||
|
/// symlink.
|
||||||
|
pub fn file_type(&self) -> FileType {
|
||||||
|
self.metadata.file_type()
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns the metadata for the file that this entry points at.
|
||||||
|
///
|
||||||
|
/// This function will not traverse symlinks if this entry points at a
|
||||||
|
/// symlink.
|
||||||
|
pub fn metadata(&self) -> Metadata {
|
||||||
|
self.metadata
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns the full path to the file that this entry represents.
|
||||||
|
///
|
||||||
|
/// The full path is created by joining the original path to `read_dir`
|
||||||
|
/// with the filename of this entry.
|
||||||
|
///
|
||||||
|
/// # Panics
|
||||||
|
///
|
||||||
|
/// This function will panic if this entry came either directly from a `ReadDir` made with
|
||||||
|
/// `Ext2::read_dir_no_path`, or indirectly from such a `ReadDir` by use of the
|
||||||
|
/// `DirEntry::read_dir` function. This is an explicit decision, so such a panic indicates a
|
||||||
|
/// definite bug in your code.
|
||||||
|
pub fn path(&self) -> PathBuf {
|
||||||
|
self.directory_path.join(self.name.clone())
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn open(&self) -> io::Result<File> {
|
||||||
|
File::from_inode(Inode::read(self.fs, self.inode)?, self.fs)
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn read_dir(&self) -> io::Result<ReadDir<'a>> {
|
||||||
|
ReadDir::read_inode(self.fs, self.inode, self.path())
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Iterator over the entries in a directory.
|
||||||
|
///
|
||||||
|
/// This iterator is returned from the [`super::Ext2::read_dir`] function and
|
||||||
|
/// will yield instances of <code>[`io::Result`]<[`DirEntry`]></code>. Through a [`DirEntry`]
|
||||||
|
/// information like the entry's path and possibly other metadata can be
|
||||||
|
/// learned.
|
||||||
|
///
|
||||||
|
/// The order in which this iterator returns entries is platform and filesystem
|
||||||
|
/// dependent.
|
||||||
|
///
|
||||||
|
/// # Errors
|
||||||
|
///
|
||||||
|
/// This [`io::Result`] will be an `Err` if there's some sort of intermittent
|
||||||
|
/// IO error during iteration.
|
||||||
|
#[derive(Debug)]
|
||||||
|
#[allow(clippy::module_name_repetitions)]
|
||||||
|
pub struct ReadDir<'a> {
|
||||||
|
fs: &'a Ext2,
|
||||||
|
file: BufReader<FileReader<'a>>,
|
||||||
|
directory_path: PathBuf,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl<'a> ReadDir<'a> {
|
||||||
|
pub fn read_inode(fs: &'a Ext2, inode: u32, path: PathBuf) -> io::Result<ReadDir<'a>> {
|
||||||
|
Ok(Self {
|
||||||
|
fs,
|
||||||
|
file: BufReader::with_capacity(
|
||||||
|
1024,
|
||||||
|
FileReader::new(File::from_inode_dir(Inode::read(fs, inode)?, fs)?, fs),
|
||||||
|
),
|
||||||
|
directory_path: path,
|
||||||
|
})
|
||||||
|
}
|
||||||
|
|
||||||
|
pub(super) fn get_entry(mut self, name: &OsStr) -> io::Result<DirEntry<'a>> {
|
||||||
|
self.find(|entry| {
|
||||||
|
if let Ok(entry) = entry {
|
||||||
|
entry.name.as_bytes() == name.as_bytes()
|
||||||
|
} else {
|
||||||
|
true
|
||||||
|
}
|
||||||
|
})
|
||||||
|
.unwrap_or_else(|| Err(io::Error::new(io::ErrorKind::NotFound, "File not found")))
|
||||||
|
}
|
||||||
|
|
||||||
|
fn next_impl(&mut self) -> io::Result<Option<DirEntry<'a>>> {
|
||||||
|
let entry: DirEntryDisk = match DirEntryDisk::read(&mut self.file) {
|
||||||
|
Ok(entry) => entry,
|
||||||
|
Err(error) => {
|
||||||
|
return if error.kind() == io::ErrorKind::UnexpectedEof {
|
||||||
|
Ok(None)
|
||||||
|
} else {
|
||||||
|
Err(error)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
};
|
||||||
|
let name = String::from_utf8(entry.name.clone()).map_err(|_| {
|
||||||
|
io::Error::new(
|
||||||
|
io::ErrorKind::InvalidData,
|
||||||
|
"Non UTF-8 directory entry names are unspported",
|
||||||
|
)
|
||||||
|
})?;
|
||||||
|
if name == "." || name == ".." || entry.inode == 0 {
|
||||||
|
return self.next_impl();
|
||||||
|
}
|
||||||
|
let entry_inode = Inode::read(self.fs, entry.inode)?;
|
||||||
|
self.fs
|
||||||
|
.dentry_cache
|
||||||
|
.write()
|
||||||
|
.insert(self.directory_path.join(name.clone()), entry.clone());
|
||||||
|
Ok(Some(DirEntry {
|
||||||
|
inode: entry.inode,
|
||||||
|
name,
|
||||||
|
metadata: Metadata::from_inode(&entry_inode),
|
||||||
|
directory_path: self.directory_path.clone(),
|
||||||
|
fs: self.fs,
|
||||||
|
}))
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl<'a> Iterator for ReadDir<'a> {
|
||||||
|
type Item = io::Result<DirEntry<'a>>;
|
||||||
|
fn next(&mut self) -> Option<Self::Item> {
|
||||||
|
self.next_impl().transpose()
|
||||||
|
}
|
||||||
|
}
|
||||||
128
src/ext2/file.rs
Normal file
128
src/ext2/file.rs
Normal file
@ -0,0 +1,128 @@
|
|||||||
|
use super::Ext2;
|
||||||
|
use super::{structs::Inode, Metadata};
|
||||||
|
use std::cmp::Ordering;
|
||||||
|
use std::io::{self, Read};
|
||||||
|
|
||||||
|
/// A reference to an open file on the filesystem.
|
||||||
|
///
|
||||||
|
/// An instance of a `File` can be read and/or written depending on what options
|
||||||
|
/// it was opened with. Files also implement [`Seek`] to alter the logical cursor
|
||||||
|
/// that the file contains internally.
|
||||||
|
///
|
||||||
|
/// Files are automatically closed when they go out of scope. Errors detected
|
||||||
|
/// on closing are ignored by the implementation of `Drop`.
|
||||||
|
#[derive(Debug)]
|
||||||
|
pub struct File {
|
||||||
|
inode: Inode,
|
||||||
|
block_size: usize,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl File {
|
||||||
|
pub(super) fn from_inode(inode: Inode, fs: &Ext2) -> io::Result<Self> {
|
||||||
|
if !Metadata::from_inode(&inode).file_type().is_file() {
|
||||||
|
return Err(io::Error::new(io::ErrorKind::Other, "Not a file"));
|
||||||
|
}
|
||||||
|
Ok(Self {
|
||||||
|
block_size: fs.reader.block_size,
|
||||||
|
inode,
|
||||||
|
})
|
||||||
|
}
|
||||||
|
|
||||||
|
/// This version of `from_inode` skips checks that the provided inode is a directory, not a file. It
|
||||||
|
/// should, only be used by `ReadDir::read_inode` to read the raw directory data.
|
||||||
|
pub(super) fn from_inode_dir(inode: Inode, fs: &Ext2) -> io::Result<Self> {
|
||||||
|
if !Metadata::from_inode(&inode).file_type().is_dir() {
|
||||||
|
return Err(io::Error::new(io::ErrorKind::Other, "Not a directory"));
|
||||||
|
}
|
||||||
|
Ok(Self {
|
||||||
|
block_size: fs.reader.block_size,
|
||||||
|
inode,
|
||||||
|
})
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Queries metadata about the underlying file.
|
||||||
|
#[allow(unused)]
|
||||||
|
pub fn metadata(&self) -> Metadata {
|
||||||
|
Metadata::from_inode(&self.inode)
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn read_at(&self, buf: &mut [u8], pos: u64, fs: &Ext2) -> io::Result<usize> {
|
||||||
|
//println!("File::read_at(File {{pos: {}, inode: {}, ...}}, &mut [?; {}], {})", self.pos, self.inode.number, buf.len(), pos);
|
||||||
|
let bytes_to_end = u64::from(self.inode.size_lower32).saturating_sub(pos);
|
||||||
|
if bytes_to_end == 0 {
|
||||||
|
//println!("File::read_at done, reporting 0 bytes read");
|
||||||
|
return Ok(0);
|
||||||
|
}
|
||||||
|
let start_block = (pos / self.block_size as u64) as u32;
|
||||||
|
let offset = (pos % self.block_size as u64) as usize;
|
||||||
|
let length = core::cmp::min(bytes_to_end, buf.len() as u64);
|
||||||
|
let _ = fs
|
||||||
|
.reader
|
||||||
|
.read_block_offset(
|
||||||
|
self.inode
|
||||||
|
.log_to_phys_block(&fs.reader, start_block)
|
||||||
|
.ok_or_else(|| io::Error::new(io::ErrorKind::UnexpectedEof, "EOF reached"))?,
|
||||||
|
offset as u32,
|
||||||
|
)?
|
||||||
|
.read(buf)?;
|
||||||
|
let mut remaining_bytes = length.saturating_sub((self.block_size - offset) as u64);
|
||||||
|
for block in (start_block + 1)..=u32::MAX {
|
||||||
|
if remaining_bytes == 0 {
|
||||||
|
break;
|
||||||
|
};
|
||||||
|
let _ =
|
||||||
|
fs.reader
|
||||||
|
.read_block(self.inode.log_to_phys_block(&fs.reader, block).ok_or_else(
|
||||||
|
|| io::Error::new(io::ErrorKind::UnexpectedEof, "EOF reached"),
|
||||||
|
)?)?
|
||||||
|
.read(&mut buf[((length - remaining_bytes) as usize)..])?;
|
||||||
|
remaining_bytes = remaining_bytes.saturating_sub(self.block_size as u64);
|
||||||
|
}
|
||||||
|
//println!("File::read_at done, reporting {} bytes read", length - remaining_bytes);
|
||||||
|
Ok((length - remaining_bytes) as usize)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug)]
|
||||||
|
pub struct FileReader<'a> {
|
||||||
|
file: File,
|
||||||
|
fs: &'a Ext2,
|
||||||
|
pos: u64,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl<'a> FileReader<'a> {
|
||||||
|
pub fn new(file: File, fs: &'a Ext2) -> Self {
|
||||||
|
Self { file, fs, pos: 0 }
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl io::Seek for FileReader<'_> {
|
||||||
|
fn seek(&mut self, pos: io::SeekFrom) -> io::Result<u64> {
|
||||||
|
match pos {
|
||||||
|
io::SeekFrom::Start(x) => self.pos = x,
|
||||||
|
io::SeekFrom::End(x) => match x.cmp(&0) {
|
||||||
|
Ordering::Equal => self.pos = u64::from(self.file.inode.size_lower32),
|
||||||
|
Ordering::Greater => unimplemented!(),
|
||||||
|
Ordering::Less => {
|
||||||
|
self.pos = u64::from(self.file.inode.size_lower32) - x.unsigned_abs()
|
||||||
|
}
|
||||||
|
},
|
||||||
|
io::SeekFrom::Current(x) => match x.cmp(&0) {
|
||||||
|
Ordering::Equal => (),
|
||||||
|
Ordering::Greater => self.pos += x.unsigned_abs(),
|
||||||
|
Ordering::Less => self.pos -= x.unsigned_abs(),
|
||||||
|
},
|
||||||
|
};
|
||||||
|
Ok(self.pos)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl io::Read for FileReader<'_> {
|
||||||
|
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
|
||||||
|
let res = self.file.read_at(buf, self.pos, &self.fs);
|
||||||
|
if let Ok(bytes_read) = res {
|
||||||
|
self.pos += bytes_read as u64;
|
||||||
|
}
|
||||||
|
res
|
||||||
|
}
|
||||||
|
}
|
||||||
253
src/ext2/metadata.rs
Normal file
253
src/ext2/metadata.rs
Normal file
@ -0,0 +1,253 @@
|
|||||||
|
#![allow(unused)]
|
||||||
|
use super::structs::Inode;
|
||||||
|
|
||||||
|
#[derive(Copy, Clone, Debug)]
|
||||||
|
pub struct Permissions(u32);
|
||||||
|
|
||||||
|
impl Permissions {
|
||||||
|
/// Returns `true` if these permissions describe a readonly (unwritable) file.
|
||||||
|
pub fn readonly(self) -> bool {
|
||||||
|
// check if any class (owner, group, others) has write permission
|
||||||
|
self.0 & 0o222 == 0
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Modifies the readonly flag for this set of permissions. If the
|
||||||
|
/// `readonly` argument is `true`, using the resulting `Permission` will
|
||||||
|
/// update file permissions to forbid writing. Conversely, if it's `false`,
|
||||||
|
/// using the resulting `Permission` will update file permissions to allow
|
||||||
|
/// writing.
|
||||||
|
///
|
||||||
|
/// This operation does **not** modify the filesystem.
|
||||||
|
pub fn set_readonly(mut self, readonly: bool) {
|
||||||
|
if readonly {
|
||||||
|
// remove write permission for all classes; equivalent to `chmod a-w <file>`
|
||||||
|
self.0 &= !0o222;
|
||||||
|
} else {
|
||||||
|
// add write permission for all classes; equivalent to `chmod a+w <file>`
|
||||||
|
self.0 |= 0o222;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns the underlying raw `st_mode` bits that contain the standard
|
||||||
|
/// Unix permissions for this file.
|
||||||
|
pub fn mode(self) -> u32 {
|
||||||
|
self.0
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Sets the underlying raw bits for this set of permissions.
|
||||||
|
pub fn set_mode(mut self, mode: u32) {
|
||||||
|
self.0 = mode;
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Creates a new instance of `Permissions` from the given set of Unix
|
||||||
|
/// permission bits.
|
||||||
|
pub fn from_mode(mode: u32) -> Self {
|
||||||
|
Self(mode)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug, PartialEq, Eq, Copy, Clone)]
|
||||||
|
pub enum FileType {
|
||||||
|
Fifo,
|
||||||
|
CharDev,
|
||||||
|
Directory,
|
||||||
|
BlockDev,
|
||||||
|
File,
|
||||||
|
SymLink,
|
||||||
|
Socket,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl FileType {
|
||||||
|
/// Tests whether this file type represents a directory. The
|
||||||
|
/// result is mutually exclusive to the results of
|
||||||
|
/// [`is_file`] and [`is_symlink`]; only zero or one of these
|
||||||
|
/// tests may pass.
|
||||||
|
pub fn is_dir(self) -> bool {
|
||||||
|
self == Self::Directory
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Tests whether this file type represents a regular file.
|
||||||
|
/// The result is mutually exclusive to the results of
|
||||||
|
/// [`is_dir`] and [`is_symlink`]; only zero or one of these
|
||||||
|
/// tests may pass.
|
||||||
|
pub fn is_file(self) -> bool {
|
||||||
|
self == Self::File
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Tests whether this file type represents a symbolic link.
|
||||||
|
/// The result is mutually exclusive to the results of
|
||||||
|
/// [`is_dir`] and [`is_file`]; only zero or one of these
|
||||||
|
/// tests may pass.
|
||||||
|
pub fn is_symlink(self) -> bool {
|
||||||
|
self == Self::SymLink
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns `true` if this file type is a fifo.
|
||||||
|
pub fn is_fifo(self) -> bool {
|
||||||
|
self == Self::Fifo
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns `true` if this file type is a block device.
|
||||||
|
pub fn is_block_device(self) -> bool {
|
||||||
|
self == Self::BlockDev
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns `true` if this file type is a char device.
|
||||||
|
pub fn is_char_device(self) -> bool {
|
||||||
|
self == Self::CharDev
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns `true` if this file type is a socket.
|
||||||
|
pub fn is_socket(self) -> bool {
|
||||||
|
self == Self::Socket
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Copy, Clone, Debug)]
|
||||||
|
pub struct Metadata {
|
||||||
|
accessed: u32,
|
||||||
|
created: u32,
|
||||||
|
file_type: FileType,
|
||||||
|
length: u64,
|
||||||
|
modified: u32,
|
||||||
|
permissions: Permissions,
|
||||||
|
ino: u64,
|
||||||
|
nlink: u64,
|
||||||
|
uid: u32,
|
||||||
|
gid: u32,
|
||||||
|
// blksize: u64,
|
||||||
|
blocks: u64,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Metadata {
|
||||||
|
pub(super) fn from_inode(inode: &Inode) -> Self {
|
||||||
|
let file_type = match (inode.type_perms & 0xF000) >> 12 {
|
||||||
|
1 => FileType::Fifo,
|
||||||
|
2 => FileType::CharDev,
|
||||||
|
4 => FileType::Directory,
|
||||||
|
6 => FileType::BlockDev,
|
||||||
|
8 => FileType::File,
|
||||||
|
0xA => FileType::SymLink,
|
||||||
|
0xC => FileType::Socket,
|
||||||
|
x => panic!("Invalid inode file type {}", x),
|
||||||
|
};
|
||||||
|
let permissions = Permissions(u32::from(inode.type_perms & 0xFFF));
|
||||||
|
Self {
|
||||||
|
accessed: inode.last_access_time,
|
||||||
|
created: inode.creation_time,
|
||||||
|
file_type,
|
||||||
|
length: u64::from(inode.size_lower32),
|
||||||
|
modified: inode.last_modification_time,
|
||||||
|
permissions,
|
||||||
|
ino: u64::from(inode.number),
|
||||||
|
nlink: u64::from(inode.hard_links_count),
|
||||||
|
uid: u32::from(inode.uid),
|
||||||
|
gid: u32::from(inode.gid),
|
||||||
|
// blksize: inode.reader.block_size as u64,
|
||||||
|
blocks: u64::from(inode.sectors_used),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns the last access time of this metadata.
|
||||||
|
///
|
||||||
|
/// The returned value corresponds to the `atime` field of `stat`
|
||||||
|
pub fn accessed(&self) -> u32 {
|
||||||
|
self.accessed
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns the creation time listed in this metadata.
|
||||||
|
///
|
||||||
|
/// The returned value corresponds to the `btime` field of `statx` on
|
||||||
|
/// Linux kernel starting from to 4.11, and the `birthtime` field of `stat` on
|
||||||
|
/// other Unix platforms.
|
||||||
|
pub fn created(&self) -> u32 {
|
||||||
|
self.created
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns the last modification time listed in this metadata.
|
||||||
|
///
|
||||||
|
/// The returned value corresponds to the `mtime` field of `stat`
|
||||||
|
pub fn modified(&self) -> u32 {
|
||||||
|
self.modified
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns the file type for this metadata.
|
||||||
|
pub fn file_type(&self) -> FileType {
|
||||||
|
self.file_type
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns `true` if this metadata is for a directory. The
|
||||||
|
/// result is mutually exclusive to the result of
|
||||||
|
/// [`Metadata::is_file`], and will be false for symlink metadata
|
||||||
|
/// obtained from [`symlink_metadata`].
|
||||||
|
pub fn is_dir(&self) -> bool {
|
||||||
|
self.file_type.is_dir()
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns `true` if this metadata is for a regular file. The
|
||||||
|
/// result is mutually exclusive to the result of
|
||||||
|
/// [`Metadata::is_dir`], and will be false for symlink metadata
|
||||||
|
/// obtained from [`symlink_metadata`].
|
||||||
|
///
|
||||||
|
/// When the goal is simply to read from (or write to) the source, the most0.227s
|
||||||
|
/// reliable way to test the source can be read (or written to) is to open
|
||||||
|
/// it. Only using `is_file` can break workflows like `diff <( prog_a )` on
|
||||||
|
/// a Unix-like system for example. See [`File::open`] or
|
||||||
|
/// [`OpenOptions::open`] for more information.
|
||||||
|
pub fn is_file(&self) -> bool {
|
||||||
|
self.file_type.is_file()
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns `true` if this metadata is for a symbolic link.
|
||||||
|
pub fn is_symlink(&self) -> bool {
|
||||||
|
self.file_type.is_symlink()
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns the size of the file, in bytes, this metadata is for.
|
||||||
|
#[allow(clippy::len_without_is_empty)]
|
||||||
|
pub fn len(&self) -> u64 {
|
||||||
|
self.length
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns the permissions of the file this metadata is for.
|
||||||
|
pub fn permissions(&self) -> Permissions {
|
||||||
|
self.permissions
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns the inode number.
|
||||||
|
pub fn ino(&self) -> u64 {
|
||||||
|
self.ino
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns the rights applied to this file.
|
||||||
|
pub fn mode(&self) -> u32 {
|
||||||
|
self.permissions.0
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns the number of hard links pointing to this file.
|
||||||
|
pub fn nlink(&self) -> u64 {
|
||||||
|
self.nlink
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns the user ID of the owner of this file.
|
||||||
|
pub fn uid(&self) -> u32 {
|
||||||
|
self.uid
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns the group ID of the owner of this file.
|
||||||
|
pub fn gid(&self) -> u32 {
|
||||||
|
self.gid
|
||||||
|
}
|
||||||
|
|
||||||
|
// /// Returns the block size for filesystem I/O.
|
||||||
|
// pub fn blksize(&self) -> u64 {
|
||||||
|
// self.blksize
|
||||||
|
// }
|
||||||
|
|
||||||
|
/// Returns the number of blocks allocated to the file, in 512-byte units.
|
||||||
|
///
|
||||||
|
/// Please note that this may be smaller than `st_size / 512` when the file has holes.
|
||||||
|
pub fn blocks(&self) -> u64 {
|
||||||
|
self.blocks
|
||||||
|
}
|
||||||
|
}
|
||||||
232
src/ext2/structs.rs
Normal file
232
src/ext2/structs.rs
Normal file
@ -0,0 +1,232 @@
|
|||||||
|
use super::{block_reader::BlockReader, Ext2};
|
||||||
|
use binread::prelude::*;
|
||||||
|
use itertools::Itertools;
|
||||||
|
use std::io::{self, Cursor, Read, Seek, SeekFrom};
|
||||||
|
use std::vec::Vec;
|
||||||
|
|
||||||
|
use std::fs::File as StdFile;
|
||||||
|
|
||||||
|
#[repr(u16)]
|
||||||
|
#[derive(Debug, BinRead)]
|
||||||
|
#[br(repr=u16)]
|
||||||
|
pub enum FSState {
|
||||||
|
Clean = 1,
|
||||||
|
HasErrors = 2,
|
||||||
|
}
|
||||||
|
|
||||||
|
#[repr(u16)]
|
||||||
|
#[derive(Debug, BinRead)]
|
||||||
|
#[br(repr=u16)]
|
||||||
|
pub enum ErrorHandlingMethod {
|
||||||
|
Ignore = 1,
|
||||||
|
RemountRO = 2,
|
||||||
|
Panic = 3,
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug, BinRead)]
|
||||||
|
#[allow(unused)]
|
||||||
|
pub struct Superblock {
|
||||||
|
pub total_inodes: u32,
|
||||||
|
pub total_blocks: u32,
|
||||||
|
pub superuser_blocks: u32,
|
||||||
|
pub unallocated_blocks: u32,
|
||||||
|
pub unallocated_inodes: u32,
|
||||||
|
pub superblock_block: u32,
|
||||||
|
pub block_size_raw: u32,
|
||||||
|
pub fragment_size_raw: u32,
|
||||||
|
pub block_group_block_count: u32,
|
||||||
|
pub block_group_fragment_count: u32,
|
||||||
|
pub block_group_inode_count: u32,
|
||||||
|
pub last_mount_time: u32,
|
||||||
|
pub last_written_time: u32,
|
||||||
|
pub times_mounted_since_last_check: u16,
|
||||||
|
pub max_mounts_before_check: u16,
|
||||||
|
pub ext2_sig: u16,
|
||||||
|
//pub fs_state: FSState,
|
||||||
|
//pub error_handling_method: ErrorHandlingMethod,
|
||||||
|
fs_state: u16,
|
||||||
|
error_handling_method: u16,
|
||||||
|
pub version_minor: u16,
|
||||||
|
pub last_check_time: u32,
|
||||||
|
pub max_interval_between_check: u32,
|
||||||
|
pub creation_os_id: u32,
|
||||||
|
pub version_major: u32,
|
||||||
|
pub reserved_uid: u16,
|
||||||
|
pub reserved_gid: u16,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Superblock {
|
||||||
|
pub fn read_from_disk(disk: &mut StdFile) -> io::Result<Self> {
|
||||||
|
disk.seek(SeekFrom::Start(1024))?;
|
||||||
|
let mut bytes = vec![0; 1024];
|
||||||
|
disk.read_exact(&mut bytes)?;
|
||||||
|
let sblock = Cursor::new(bytes).read_le().unwrap();
|
||||||
|
//dbg!(&sblock);
|
||||||
|
Ok(sblock)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug, Clone, BinRead)]
|
||||||
|
#[allow(unused)]
|
||||||
|
pub struct BlockGroupDescriptor {
|
||||||
|
pub block_usage_block: u32,
|
||||||
|
pub inode_usage_block: u32,
|
||||||
|
pub inode_table_start: u32,
|
||||||
|
pub unallocated_blocks: u16,
|
||||||
|
pub unallocated_inodes: u16,
|
||||||
|
pub num_directories: u16,
|
||||||
|
pub reserved: [u8; 14],
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug, Clone)]
|
||||||
|
pub struct DirEntryDisk {
|
||||||
|
pub inode: u32,
|
||||||
|
pub entry_size: u16,
|
||||||
|
pub name_len: u8,
|
||||||
|
pub high_len_or_type: u8,
|
||||||
|
pub name: Vec<u8>,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl DirEntryDisk {
|
||||||
|
pub fn read(reader: &mut (impl Read + Seek)) -> io::Result<Self> {
|
||||||
|
let mut inode = [0u8; 4];
|
||||||
|
reader.read_exact(&mut inode)?;
|
||||||
|
let inode = u32::from_le_bytes(inode);
|
||||||
|
let mut entry_size = [0u8; 2];
|
||||||
|
reader.read_exact(&mut entry_size)?;
|
||||||
|
let entry_size = u16::from_le_bytes(entry_size);
|
||||||
|
let mut name_len = [0u8; 1];
|
||||||
|
reader.read_exact(&mut name_len)?;
|
||||||
|
let name_len = name_len[0];
|
||||||
|
let mut high_len_or_type = [0u8; 1];
|
||||||
|
reader.read_exact(&mut high_len_or_type)?;
|
||||||
|
let high_len_or_type = high_len_or_type[0];
|
||||||
|
let mut name = vec![0; name_len as usize];
|
||||||
|
reader.read_exact(&mut name)?;
|
||||||
|
reader.seek_relative(i64::from(entry_size - u16::from(name_len) - 8))?;
|
||||||
|
//dbg!(inode, entry_size, &name);
|
||||||
|
Ok(Self {
|
||||||
|
inode,
|
||||||
|
entry_size,
|
||||||
|
name_len,
|
||||||
|
high_len_or_type,
|
||||||
|
name,
|
||||||
|
})
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug, Clone, BinRead)]
|
||||||
|
#[br(import(number: u32))]
|
||||||
|
#[allow(unused)]
|
||||||
|
pub struct Inode {
|
||||||
|
pub type_perms: u16,
|
||||||
|
pub uid: u16,
|
||||||
|
pub size_lower32: u32,
|
||||||
|
pub last_access_time: u32,
|
||||||
|
pub creation_time: u32,
|
||||||
|
pub last_modification_time: u32,
|
||||||
|
pub deletion_time: u32,
|
||||||
|
pub gid: u16,
|
||||||
|
pub hard_links_count: u16,
|
||||||
|
pub sectors_used: u32,
|
||||||
|
pub flags: u32,
|
||||||
|
pub os_specific_1: u32,
|
||||||
|
pub direct_block_pointers: [u32; 12],
|
||||||
|
pub singly_indirect_block_pointer: u32,
|
||||||
|
pub doubly_indirect_block_pointer: u32,
|
||||||
|
pub triply_indirect_block_pointer: u32,
|
||||||
|
pub generation_number: u32,
|
||||||
|
pub file_acl: u32,
|
||||||
|
pub file_size_upper32_dir_acl: u32,
|
||||||
|
pub fragment_block_address: u32,
|
||||||
|
pub os_specific_2: [u8; 12],
|
||||||
|
#[br(calc = number)]
|
||||||
|
pub number: u32,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Inode {
|
||||||
|
pub(super) fn read(fs: &Ext2, inode_num: u32) -> io::Result<Self> {
|
||||||
|
if let Some(ino) = fs.inode_cache.read().get(&inode_num) {
|
||||||
|
//println!("Inode {}: In cache", inode_num);
|
||||||
|
return Ok(ino.clone());
|
||||||
|
}
|
||||||
|
//println!("Inode {}: Not in cache", inode_num);
|
||||||
|
let ino = fs.descriptor_table.inode_loc(inode_num).read(&fs.reader)?;
|
||||||
|
fs.inode_cache.write().insert(inode_num, ino.clone());
|
||||||
|
Ok(ino)
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn pointer_block_blocks(&self, block: u32, reader: &BlockReader) -> io::Result<Vec<u32>> {
|
||||||
|
Ok(reader
|
||||||
|
.read_block(block)?
|
||||||
|
.into_inner()
|
||||||
|
.iter()
|
||||||
|
.copied()
|
||||||
|
.tuples::<(_, _, _, _)>()
|
||||||
|
.map(|raw| u32::from_le_bytes([raw.0, raw.1, raw.2, raw.3]))
|
||||||
|
.collect_vec())
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn log_to_phys_block(&self, reader: &BlockReader, block: u32) -> Option<u32> {
|
||||||
|
let num_sing_indir = reader.block_size / 4;
|
||||||
|
let num_doub_indir = num_sing_indir * num_sing_indir;
|
||||||
|
let num_trip_indir = num_sing_indir * num_doub_indir;
|
||||||
|
if block < 12 {
|
||||||
|
if self.direct_block_pointers[block as usize] == 0 {
|
||||||
|
None
|
||||||
|
} else {
|
||||||
|
Some(self.direct_block_pointers[block as usize])
|
||||||
|
}
|
||||||
|
} else if block < (12 + num_sing_indir) as u32 {
|
||||||
|
let blocks = self
|
||||||
|
.pointer_block_blocks(self.singly_indirect_block_pointer, reader)
|
||||||
|
.ok()?;
|
||||||
|
let block = blocks[(block - 12) as usize];
|
||||||
|
if block == 0 {
|
||||||
|
None
|
||||||
|
} else {
|
||||||
|
Some(block)
|
||||||
|
}
|
||||||
|
} else if block < (12 + num_sing_indir + num_doub_indir) as u32 {
|
||||||
|
let base_block = 12 - num_sing_indir;
|
||||||
|
let doub_indir_offset = (block as usize - base_block) / num_sing_indir;
|
||||||
|
let sing_indir_offset = (block as usize - base_block) % num_sing_indir;
|
||||||
|
let sing_indir_blocks = self
|
||||||
|
.pointer_block_blocks(self.doubly_indirect_block_pointer, reader)
|
||||||
|
.ok()?;
|
||||||
|
let blocks = self
|
||||||
|
.pointer_block_blocks(sing_indir_blocks[doub_indir_offset], reader)
|
||||||
|
.ok()?;
|
||||||
|
let block = blocks[sing_indir_offset];
|
||||||
|
if block == 0 {
|
||||||
|
None
|
||||||
|
} else {
|
||||||
|
Some(block)
|
||||||
|
}
|
||||||
|
} else if block < (12 + num_sing_indir + num_doub_indir + num_trip_indir) as u32 {
|
||||||
|
let base_block = 12 - num_sing_indir;
|
||||||
|
let trip_indir_offset = (block as usize - base_block) / num_doub_indir;
|
||||||
|
let doub_indir_offset =
|
||||||
|
((block as usize - base_block) % num_doub_indir) / num_sing_indir;
|
||||||
|
let sing_indir_offset =
|
||||||
|
((block as usize - base_block) % num_doub_indir) % num_sing_indir;
|
||||||
|
let doub_indir_blocks = self
|
||||||
|
.pointer_block_blocks(self.triply_indirect_block_pointer, reader)
|
||||||
|
.ok()?;
|
||||||
|
let sing_indir_blocks = self
|
||||||
|
.pointer_block_blocks(doub_indir_blocks[trip_indir_offset], reader)
|
||||||
|
.ok()?;
|
||||||
|
let blocks = self
|
||||||
|
.pointer_block_blocks(sing_indir_blocks[doub_indir_offset], reader)
|
||||||
|
.ok()?;
|
||||||
|
let block = blocks[sing_indir_offset];
|
||||||
|
if block == 0 {
|
||||||
|
None
|
||||||
|
} else {
|
||||||
|
Some(block)
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
None
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
91
src/main.rs
Normal file
91
src/main.rs
Normal file
@ -0,0 +1,91 @@
|
|||||||
|
mod ext2;
|
||||||
|
|
||||||
|
use std::{
|
||||||
|
borrow::Cow,
|
||||||
|
fs::File,
|
||||||
|
os::mikros::{ipc, syscalls},
|
||||||
|
sync::Arc,
|
||||||
|
};
|
||||||
|
|
||||||
|
use ext2::Ext2;
|
||||||
|
use parking_lot::RwLock;
|
||||||
|
|
||||||
|
#[derive(Clone)]
|
||||||
|
struct Serv {
|
||||||
|
mounts: Arc<RwLock<Vec<Ext2>>>,
|
||||||
|
files: Arc<RwLock<Vec<(ext2::File, usize)>>>,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl fs_rpc::Server for Serv {
|
||||||
|
fn mount(&self, dev: &std::path::Path) -> Result<u64, ()> {
|
||||||
|
let disk = File::open(dev).map_err(|_| ())?;
|
||||||
|
let fs = Ext2::new(disk).map_err(|_| ())?;
|
||||||
|
self.mounts.write().push(fs);
|
||||||
|
let res = Ok((self.mounts.read().len() - 1) as u64);
|
||||||
|
res
|
||||||
|
}
|
||||||
|
|
||||||
|
fn open(&self, path: &std::path::Path, mount_id: u64) -> Result<(Option<u64>, u64), ()> {
|
||||||
|
let mounts = self.mounts.read();
|
||||||
|
let mount = &mounts[mount_id as usize];
|
||||||
|
let file = mount.open(path).map_err(|_| ())?;
|
||||||
|
self.files.write().push((file, mount_id as usize));
|
||||||
|
let res = Ok((None, (self.files.read().len() - 1) as u64));
|
||||||
|
res
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl file_rpc::Server for Serv {
|
||||||
|
fn read(&self, fd: u64, pos: u64, len: usize) -> Result<Cow<'_, [u8]>, ()> {
|
||||||
|
let files = self.files.read();
|
||||||
|
let (file, mount_id) = &files[fd as usize];
|
||||||
|
let mounts = self.mounts.read();
|
||||||
|
let mount = &mounts[*mount_id];
|
||||||
|
let mut buf = vec![0; len];
|
||||||
|
let read_len = file.read_at(&mut buf, pos, mount).map_err(|_| ())?;
|
||||||
|
buf.truncate(read_len);
|
||||||
|
Ok(buf.into())
|
||||||
|
}
|
||||||
|
|
||||||
|
fn write(&self, _fd: u64, _pos: u64, _data: &[u8]) -> Result<(), ()> {
|
||||||
|
Err(())
|
||||||
|
}
|
||||||
|
|
||||||
|
fn close(&self, _fd: u64) {}
|
||||||
|
|
||||||
|
fn size(&self, fd: u64) -> Option<u64> {
|
||||||
|
let files = self.files.read();
|
||||||
|
let (file, _mount_id) = &files[fd as usize];
|
||||||
|
Some(file.metadata().len())
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn main() {
|
||||||
|
let serv = Serv {
|
||||||
|
mounts: Arc::new(RwLock::new(Vec::new())),
|
||||||
|
files: Arc::new(RwLock::new(Vec::new())),
|
||||||
|
};
|
||||||
|
fs_rpc::register_server(Box::new(serv.clone()));
|
||||||
|
file_rpc::register_server(Box::new(serv));
|
||||||
|
let vfs_pid;
|
||||||
|
loop {
|
||||||
|
if let Some(pid) = syscalls::try_get_registered(0) {
|
||||||
|
vfs_pid = pid;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
vfs_rpc::Client::new(vfs_pid).register_fs("ext2").unwrap();
|
||||||
|
let syslog_pid;
|
||||||
|
loop {
|
||||||
|
if let Some(pid) = syscalls::try_get_registered(2) {
|
||||||
|
syslog_pid = pid;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
syslog_rpc::Client::new(syslog_pid)
|
||||||
|
.send_text_binary_message("ext2".to_string(), "Ext2 FS initialized".to_string(), 0, [])
|
||||||
|
.unwrap();
|
||||||
|
loop {
|
||||||
|
ipc::process_messages()
|
||||||
|
}
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue
Block a user