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split fs mod

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toolchain_update
WangRunji 6 years ago
parent 7927c7c168
commit cf9ac9ccfd
6 changed files with 241 additions and 174 deletions
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174
kernel/src/fs.rs
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@ -1,174 +0,0 @@
use simple_filesystem::*;
use alloc::{boxed::Box, sync::Arc, string::String, collections::VecDeque, vec::Vec};
use core::any::Any;
use core::ops::Deref;
use lazy_static::lazy_static;
#[cfg(target_arch = "x86_64")]
use crate::arch::driver::ide;
use crate::sync::Condvar;
use crate::sync::SpinNoIrqLock as Mutex;
use crate::drivers::{self, AsAny};
use crate::drivers::block::virtio_blk::VirtIOBlkDriver;
lazy_static! {
pub static ref ROOT_INODE: Arc<INode> = {
#[cfg(not(feature = "link_user"))]
let device = {
#[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))]
{
Box::new(drivers::DRIVERS.lock().iter()
.map(|device| device.deref().as_any().downcast_ref::<VirtIOBlkDriver>())
.find(|maybe_blk| maybe_blk.is_some())
.expect("VirtIOBlk not found")
.unwrap().clone())
}
#[cfg(target_arch = "x86_64")]
{
Box::new(ide::IDE::new(1))
}
};
#[cfg(feature = "link_user")]
let device = {
extern {
fn _user_img_start();
fn _user_img_end();
}
Box::new(unsafe { MemBuf::new(_user_img_start, _user_img_end) })
};
let sfs = SimpleFileSystem::open(device).expect("failed to open SFS");
sfs.root_inode()
};
}
#[cfg(not(target_arch = "x86_64"))]
struct MemBuf(&'static [u8]);
#[cfg(not(target_arch = "x86_64"))]
impl MemBuf {
unsafe fn new(begin: unsafe extern fn(), end: unsafe extern fn()) -> Self {
use core::slice;
MemBuf(slice::from_raw_parts(begin as *const u8, end as usize - begin as usize))
}
}
#[cfg(not(target_arch = "x86_64"))]
impl Device for MemBuf {
fn read_at(&mut self, offset: usize, buf: &mut [u8]) -> Option<usize> {
let slice = self.0;
let len = buf.len().min(slice.len() - offset);
buf[..len].copy_from_slice(&slice[offset..offset + len]);
Some(len)
}
fn write_at(&mut self, _offset: usize, _buf: &[u8]) -> Option<usize> {
None
}
}
#[cfg(target_arch = "x86_64")]
impl BlockedDevice for ide::IDE {
const BLOCK_SIZE_LOG2: u8 = 9;
fn read_at(&mut self, block_id: usize, buf: &mut [u8]) -> bool {
use core::slice;
assert!(buf.len() >= ide::BLOCK_SIZE);
let buf = unsafe { slice::from_raw_parts_mut(buf.as_ptr() as *mut u32, ide::BLOCK_SIZE / 4) };
self.read(block_id as u64, 1, buf).is_ok()
}
fn write_at(&mut self, block_id: usize, buf: &[u8]) -> bool {
use core::slice;
assert!(buf.len() >= ide::BLOCK_SIZE);
let buf = unsafe { slice::from_raw_parts(buf.as_ptr() as *mut u32, ide::BLOCK_SIZE / 4) };
self.write(block_id as u64, 1, buf).is_ok()
}
}
#[derive(Default)]
pub struct Stdin {
buf: Mutex<VecDeque<char>>,
pushed: Condvar,
}
impl Stdin {
pub fn push(&self, c: char) {
self.buf.lock().push_back(c);
self.pushed.notify_one();
}
pub fn pop(&self) -> char {
// QEMU v3.0 don't support M-mode external interrupt (bug?)
// So we have to use polling.
#[cfg(feature = "m_mode")]
loop {
let c = crate::arch::io::getchar();
if c != '\0' { return c; }
}
#[cfg(not(feature = "m_mode"))]
loop {
let ret = self.buf.lock().pop_front();
match ret {
Some(c) => return c,
None => self.pushed._wait(),
}
}
}
}
#[derive(Default)]
pub struct Stdout;
lazy_static! {
pub static ref STDIN: Arc<Stdin> = Arc::new(Stdin::default());
pub static ref STDOUT: Arc<Stdout> = Arc::new(Stdout::default());
}
// TODO: better way to provide default impl?
macro_rules! impl_inode {
() => {
fn info(&self) -> Result<FileInfo> { Err(FsError::NotSupported) }
fn sync(&self) -> Result<()> { Ok(()) }
fn resize(&self, _len: usize) -> Result<()> { Err(FsError::NotSupported) }
fn create(&self, _name: &str, _type_: FileType) -> Result<Arc<INode>> { Err(FsError::NotDir) }
fn unlink(&self, _name: &str) -> Result<()> { Err(FsError::NotDir) }
fn link(&self, _name: &str, _other: &Arc<INode>) -> Result<()> { Err(FsError::NotDir) }
fn rename(&self, _old_name: &str, _new_name: &str) -> Result<()> { Err(FsError::NotDir) }
fn move_(&self, _old_name: &str, _target: &Arc<INode>, _new_name: &str) -> Result<()> { Err(FsError::NotDir) }
fn find(&self, _name: &str) -> Result<Arc<INode>> { Err(FsError::NotDir) }
fn get_entry(&self, _id: usize) -> Result<String> { Err(FsError::NotDir) }
fn fs(&self) -> Arc<FileSystem> { unimplemented!() }
fn as_any_ref(&self) -> &Any { self }
};
}
impl INode for Stdin {
fn read_at(&self, _offset: usize, buf: &mut [u8]) -> Result<usize> {
buf[0] = self.pop() as u8;
Ok(1)
}
fn write_at(&self, _offset: usize, _buf: &[u8]) -> Result<usize> { unimplemented!() }
impl_inode!();
}
impl INode for Stdout {
fn read_at(&self, _offset: usize, _buf: &mut [u8]) -> Result<usize> { unimplemented!() }
fn write_at(&self, _offset: usize, buf: &[u8]) -> Result<usize> {
use core::str;
//we do not care the utf-8 things, we just want to print it!
let s = unsafe{ str::from_utf8_unchecked(buf) };
print!("{}", s);
Ok(buf.len())
}
impl_inode!();
}
pub trait INodeExt {
fn read_as_vec(&self) -> Result<Vec<u8>>;
}
impl INodeExt for INode {
fn read_as_vec(&self) -> Result<Vec<u8>> {
let size = self.info()?.size;
let mut buf = Vec::with_capacity(size);
unsafe { buf.set_len(size); }
self.read_at(0, buf.as_mut_slice())?;
Ok(buf)
}
}

47
kernel/src/fs/device.rs
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//! Implement Device
use simple_filesystem::*;
#[cfg(target_arch = "x86_64")]
use crate::arch::driver::ide;
#[cfg(not(target_arch = "x86_64"))]
pub struct MemBuf(&'static [u8]);
#[cfg(not(target_arch = "x86_64"))]
impl MemBuf {
unsafe fn new(begin: unsafe extern fn(), end: unsafe extern fn()) -> Self {
use core::slice;
MemBuf(slice::from_raw_parts(begin as *const u8, end as usize - begin as usize))
}
}
#[cfg(not(target_arch = "x86_64"))]
impl Device for MemBuf {
fn read_at(&mut self, offset: usize, buf: &mut [u8]) -> Option<usize> {
let slice = self.0;
let len = buf.len().min(slice.len() - offset);
buf[..len].copy_from_slice(&slice[offset..offset + len]);
Some(len)
}
fn write_at(&mut self, _offset: usize, _buf: &[u8]) -> Option<usize> {
None
}
}
#[cfg(target_arch = "x86_64")]
impl BlockedDevice for ide::IDE {
const BLOCK_SIZE_LOG2: u8 = 9;
fn read_at(&mut self, block_id: usize, buf: &mut [u8]) -> bool {
use core::slice;
assert!(buf.len() >= ide::BLOCK_SIZE);
let buf = unsafe { slice::from_raw_parts_mut(buf.as_ptr() as *mut u32, ide::BLOCK_SIZE / 4) };
self.read(block_id as u64, 1, buf).is_ok()
}
fn write_at(&mut self, block_id: usize, buf: &[u8]) -> bool {
use core::slice;
assert!(buf.len() >= ide::BLOCK_SIZE);
let buf = unsafe { slice::from_raw_parts(buf.as_ptr() as *mut u32, ide::BLOCK_SIZE / 4) };
self.write(block_id as u64, 1, buf).is_ok()
}
}

41
kernel/src/fs/file.rs
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//! File structure for process
use alloc::{string::String, sync::Arc};
use simple_filesystem::{FileInfo, INode, Result};
#[derive(Clone)]
pub struct File {
inode: Arc<INode>,
offset: usize,
readable: bool,
writable: bool,
}
impl File {
pub fn new(inode: Arc<INode>, readable: bool, writable: bool) -> Self {
File { inode, offset: 0, readable, writable }
}
pub fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
assert!(self.readable);
let len = self.inode.read_at(self.offset, buf)?;
self.offset += len;
Ok(len)
}
pub fn write(&mut self, buf: &[u8]) -> Result<usize> {
assert!(self.writable);
let len = self.inode.write_at(self.offset, buf)?;
self.offset += len;
Ok(len)
}
pub fn info(&self) -> Result<FileInfo> {
self.inode.info()
}
pub fn get_entry(&self, id: usize) -> Result<String> {
self.inode.get_entry(id)
}
}

63
kernel/src/fs/mod.rs
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use alloc::{boxed::Box, collections::VecDeque, string::String, sync::Arc, vec::Vec};
use core::any::Any;
use core::ops::Deref;
use simple_filesystem::*;
#[cfg(target_arch = "x86_64")]
use crate::arch::driver::ide;
use crate::drivers::{self, AsAny};
use crate::drivers::block::virtio_blk::VirtIOBlkDriver;
pub use self::file::File;
pub use self::stdio::{STDIN, STDOUT};
mod file;
mod stdio;
mod device;
lazy_static! {
/// The root of file system
pub static ref ROOT_INODE: Arc<INode> = {
#[cfg(not(feature = "link_user"))]
let device = {
#[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))]
{
Box::new(drivers::DRIVERS.lock().iter()
.map(|device| device.deref().as_any().downcast_ref::<VirtIOBlkDriver>())
.find(|maybe_blk| maybe_blk.is_some())
.expect("VirtIOBlk not found")
.unwrap().clone())
}
#[cfg(target_arch = "x86_64")]
{
Box::new(ide::IDE::new(1))
}
};
#[cfg(feature = "link_user")]
let device = {
extern {
fn _user_img_start();
fn _user_img_end();
}
Box::new(unsafe { device::MemBuf::new(_user_img_start, _user_img_end) })
};
let sfs = SimpleFileSystem::open(device).expect("failed to open SFS");
sfs.root_inode()
};
}
pub trait INodeExt {
fn read_as_vec(&self) -> Result<Vec<u8>>;
}
impl INodeExt for INode {
fn read_as_vec(&self) -> Result<Vec<u8>> {
let size = self.info()?.size;
let mut buf = Vec::with_capacity(size);
unsafe { buf.set_len(size); }
self.read_at(0, buf.as_mut_slice())?;
Ok(buf)
}
}

86
kernel/src/fs/stdio.rs
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//! Implement INode for Stdin & Stdout
use alloc::{collections::vec_deque::VecDeque, string::String, sync::Arc};
use core::any::Any;
use simple_filesystem::*;
use crate::sync::Condvar;
use crate::sync::SpinNoIrqLock as Mutex;
#[derive(Default)]
pub struct Stdin {
buf: Mutex<VecDeque<char>>,
pushed: Condvar,
}
impl Stdin {
pub fn push(&self, c: char) {
self.buf.lock().push_back(c);
self.pushed.notify_one();
}
pub fn pop(&self) -> char {
// QEMU v3.0 don't support M-mode external interrupt (bug?)
// So we have to use polling.
#[cfg(feature = "m_mode")]
loop {
let c = crate::arch::io::getchar();
if c != '\0' { return c; }
}
#[cfg(not(feature = "m_mode"))]
loop {
let ret = self.buf.lock().pop_front();
match ret {
Some(c) => return c,
None => self.pushed._wait(),
}
}
}
}
#[derive(Default)]
pub struct Stdout;
lazy_static! {
pub static ref STDIN: Arc<Stdin> = Arc::new(Stdin::default());
pub static ref STDOUT: Arc<Stdout> = Arc::new(Stdout::default());
}
// TODO: better way to provide default impl?
macro_rules! impl_inode {
() => {
fn info(&self) -> Result<FileInfo> { Err(FsError::NotSupported) }
fn sync(&self) -> Result<()> { Ok(()) }
fn resize(&self, _len: usize) -> Result<()> { Err(FsError::NotSupported) }
fn create(&self, _name: &str, _type_: FileType) -> Result<Arc<INode>> { Err(FsError::NotDir) }
fn unlink(&self, _name: &str) -> Result<()> { Err(FsError::NotDir) }
fn link(&self, _name: &str, _other: &Arc<INode>) -> Result<()> { Err(FsError::NotDir) }
fn rename(&self, _old_name: &str, _new_name: &str) -> Result<()> { Err(FsError::NotDir) }
fn move_(&self, _old_name: &str, _target: &Arc<INode>, _new_name: &str) -> Result<()> { Err(FsError::NotDir) }
fn find(&self, _name: &str) -> Result<Arc<INode>> { Err(FsError::NotDir) }
fn get_entry(&self, _id: usize) -> Result<String> { Err(FsError::NotDir) }
fn fs(&self) -> Arc<FileSystem> { unimplemented!() }
fn as_any_ref(&self) -> &Any { self }
};
}
impl INode for Stdin {
fn read_at(&self, _offset: usize, buf: &mut [u8]) -> Result<usize> {
buf[0] = self.pop() as u8;
Ok(1)
}
fn write_at(&self, _offset: usize, _buf: &[u8]) -> Result<usize> { unimplemented!() }
impl_inode!();
}
impl INode for Stdout {
fn read_at(&self, _offset: usize, _buf: &mut [u8]) -> Result<usize> { unimplemented!() }
fn write_at(&self, _offset: usize, buf: &[u8]) -> Result<usize> {
use core::str;
//we do not care the utf-8 things, we just want to print it!
let s = unsafe{ str::from_utf8_unchecked(buf) };
print!("{}", s);
Ok(buf.len())
}
impl_inode!();
}

4
kernel/src/lib.rs
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@ -11,6 +11,10 @@
// just keep it ...
#[macro_use]
extern crate alloc;
#[macro_use]
extern crate log;
#[macro_use]
extern crate lazy_static;
pub use crate::process::{processor, new_kernel_context};
use rcore_thread::std_thread as thread;

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