Add support for DevFS

services/libs/jinux-std/src/device/mod.rs

@@ -0,0 +1,17 @@
+mod null;
+pub mod tty;
+mod zero;
+
+use crate::fs::device::{add_node, Device, DeviceId, DeviceType};
+use crate::prelude::*;
+
+/// Init the device node in fs, must be called after mounting rootfs.
+pub fn init() -> Result<()> {
+    let null = Arc::new(null::Null);
+    add_node(null, "null")?;
+    let zero = Arc::new(zero::Zero);
+    add_node(zero, "zero")?;
+    let tty = tty::get_n_tty().clone();
+    add_node(tty, "tty")?;
+    Ok(())
+}

services/libs/jinux-std/src/device/null.rs

@@ -0,0 +1,23 @@
+use super::*;
+use crate::prelude::*;
+
+pub struct Null;
+
+impl Device for Null {
+    fn type_(&self) -> DeviceType {
+        DeviceType::CharDevice
+    }
+
+    fn id(&self) -> DeviceId {
+        // Same value with Linux
+        DeviceId::new(1, 3)
+    }
+
+    fn read(&self, _buf: &mut [u8]) -> Result<usize> {
+        Ok(0)
+    }
+
+    fn write(&self, buf: &[u8]) -> Result<usize> {
+        Ok(buf.len())
+    }
+}

services/libs/jinux-std/src/device/tty/mod.rs

@@ -1,10 +1,7 @@
 use self::line_discipline::LineDiscipline;
+use super::*;
 use crate::driver::tty::TtyDriver;
-use crate::fs::utils::{InodeMode, InodeType, IoEvents, Metadata};
-use crate::fs::{
-    file_handle::FileLike,
-    utils::{IoctlCmd, Poller},
-};
+use crate::fs::utils::{IoEvents, IoctlCmd, Poller};
 use crate::prelude::*;
 use crate::process::Pgid;
 use crate::util::{read_val_from_user, write_val_to_user};
@@ -51,7 +48,16 @@ impl Tty {
     }
 }
 
-impl FileLike for Tty {
+impl Device for Tty {
+    fn type_(&self) -> DeviceType {
+        DeviceType::CharDevice
+    }
+
+    fn id(&self) -> DeviceId {
+        // Same value with Linux
+        DeviceId::new(5, 0)
+    }
+
     fn read(&self, buf: &mut [u8]) -> Result<usize> {
         self.ldisc.read(buf)
     }
@@ -110,25 +116,6 @@ impl FileLike for Tty {
             _ => todo!(),
         }
     }
-
-    fn metadata(&self) -> Metadata {
-        Metadata {
-            dev: 0,
-            ino: 0,
-            size: 0,
-            blk_size: 1024,
-            blocks: 0,
-            atime: Default::default(),
-            mtime: Default::default(),
-            ctime: Default::default(),
-            type_: InodeType::CharDevice,
-            mode: InodeMode::from_bits_truncate(0o666),
-            nlinks: 1,
-            uid: 0,
-            gid: 0,
-            rdev: 0,
-        }
-    }
 }
 
 /// FIXME: should we maintain a static console?

services/libs/jinux-std/src/device/zero.rs

@@ -0,0 +1,26 @@
+use super::*;
+use crate::prelude::*;
+
+pub struct Zero;
+
+impl Device for Zero {
+    fn type_(&self) -> DeviceType {
+        DeviceType::CharDevice
+    }
+
+    fn id(&self) -> DeviceId {
+        // Same value with Linux
+        DeviceId::new(1, 5)
+    }
+
+    fn read(&self, buf: &mut [u8]) -> Result<usize> {
+        for byte in buf.iter_mut() {
+            *byte = 0;
+        }
+        Ok(buf.len())
+    }
+
+    fn write(&self, buf: &[u8]) -> Result<usize> {
+        Ok(buf.len())
+    }
+}

services/libs/jinux-std/src/driver/tty.rs

@@ -1,8 +1,8 @@
 pub use jinux_frame::arch::x86::device::serial::register_serial_input_callback;
 
 use crate::{
+    device::tty::{get_n_tty, Tty},
     prelude::*,
-    tty::{get_n_tty, Tty},
 };
 
 lazy_static! {

services/libs/jinux-std/src/fs/device.rs

@@ -0,0 +1,143 @@
+use crate::fs::fs_resolver::{FsPath, FsResolver};
+use crate::fs::utils::Dentry;
+use crate::fs::utils::{InodeMode, InodeType, IoEvents, IoctlCmd, Poller};
+use crate::prelude::*;
+
+/// The abstract of device
+pub trait Device: Sync + Send {
+    /// Return the device type.
+    fn type_(&self) -> DeviceType;
+
+    /// Return the device ID.
+    fn id(&self) -> DeviceId;
+
+    /// Read from the device.
+    fn read(&self, buf: &mut [u8]) -> Result<usize>;
+
+    /// Write to the device.
+    fn write(&self, buf: &[u8]) -> Result<usize>;
+
+    /// Poll on the device.
+    fn poll(&self, mask: IoEvents, poller: Option<&Poller>) -> IoEvents {
+        let events = IoEvents::IN | IoEvents::OUT;
+        events & mask
+    }
+
+    /// Ioctl on the device.
+    fn ioctl(&self, cmd: IoctlCmd, arg: usize) -> Result<i32> {
+        return_errno_with_message!(Errno::EINVAL, "ioctl is not supported");
+    }
+}
+
+/// Device type
+pub enum DeviceType {
+    CharDevice,
+    BlockDevice,
+}
+
+/// Device Id
+pub struct DeviceId(u64);
+
+impl DeviceId {
+    pub fn new(major: u32, minor: u32) -> Self {
+        let major = major as u64;
+        let minor = minor as u64;
+        Self(
+            (major & 0xffff_f000) << 32
+                | (major & 0x0000_0fff) << 8
+                | (minor & 0xffff_ff00) << 12
+                | (minor & 0x0000_00ff),
+        )
+    }
+
+    pub fn major(&self) -> u32 {
+        ((self.0 >> 32) & 0xffff_f000 | (self.0 >> 8) & 0x0000_0fff) as u32
+    }
+
+    pub fn minor(&self) -> u32 {
+        ((self.0 >> 12) & 0xffff_ff00 | self.0 & 0x0000_00ff) as u32
+    }
+}
+
+impl Into<u64> for DeviceId {
+    fn into(self) -> u64 {
+        self.0
+    }
+}
+
+/// Add a device node to FS for the device.
+///
+/// If the parent path is not existing, `mkdir -p` the parent path.
+/// This function is used in registering device.
+pub fn add_node(device: Arc<dyn Device>, path: &str) -> Result<Arc<Dentry>> {
+    let mut dentry = {
+        let fs_resolver = FsResolver::new();
+        fs_resolver.lookup(&FsPath::try_from("/dev").unwrap())?
+    };
+    let mut relative_path = {
+        let relative_path = path.trim_start_matches('/');
+        if relative_path.is_empty() {
+            return_errno_with_message!(Errno::EINVAL, "invalid device path");
+        }
+        relative_path
+    };
+
+    while !relative_path.is_empty() {
+        let (next_name, path_remain) = if let Some((prefix, suffix)) = relative_path.split_once('/')
+        {
+            (prefix, suffix.trim_start_matches('/'))
+        } else {
+            (relative_path, "")
+        };
+
+        match dentry.lookup(next_name) {
+            Ok(next_dentry) => {
+                if path_remain.is_empty() {
+                    return_errno_with_message!(Errno::EEXIST, "device node is existing");
+                }
+                dentry = next_dentry;
+            }
+            Err(_) => {
+                if path_remain.is_empty() {
+                    // Create the device node
+                    dentry = dentry.mknod(
+                        next_name,
+                        InodeMode::from_bits_truncate(0o666),
+                        device.clone(),
+                    )?;
+                } else {
+                    // Mkdir parent path
+                    dentry = dentry.create(
+                        next_name,
+                        InodeType::Dir,
+                        InodeMode::from_bits_truncate(0o755),
+                    )?;
+                }
+            }
+        }
+        relative_path = path_remain;
+    }
+
+    Ok(dentry)
+}
+
+/// Delete the device node from FS for the device.
+///
+/// This function is used in unregistering device.
+pub fn delete_node(path: &str) -> Result<()> {
+    let abs_path = {
+        let device_path = path.trim_start_matches('/');
+        if device_path.is_empty() {
+            return_errno_with_message!(Errno::EINVAL, "invalid device path");
+        }
+        String::from("/dev") + "/" + device_path
+    };
+
+    let (parent_dentry, name) = {
+        let fs_resolver = FsResolver::new();
+        fs_resolver.lookup_dir_and_base_name(&FsPath::try_from(abs_path.as_str()).unwrap())?
+    };
+
+    parent_dentry.unlink(&name)?;
+    Ok(())
+}

services/libs/jinux-std/src/fs/file_handle.rs

@@ -3,7 +3,6 @@
 use crate::events::Observer;
 use crate::fs::utils::{AccessMode, IoEvents, IoctlCmd, Metadata, Poller, SeekFrom, StatusFlags};
 use crate::prelude::*;
-use crate::tty::get_n_tty;
 
 use core::any::Any;
 
@@ -18,14 +17,7 @@ pub trait FileLike: Send + Sync + Any {
     }
 
     fn ioctl(&self, cmd: IoctlCmd, arg: usize) -> Result<i32> {
-        match cmd {
-            IoctlCmd::TCGETS => {
-                // FIXME: only a work around
-                let tty = get_n_tty();
-                tty.ioctl(cmd, arg)
-            }
-            _ => panic!("Ioctl unsupported"),
-        }
+        return_errno_with_message!(Errno::EINVAL, "ioctl is not supported");
     }
 
     fn poll(&self, _mask: IoEvents, _poller: Option<&Poller>) -> IoEvents {

services/libs/jinux-std/src/fs/fs_resolver.rs

@@ -1,6 +1,5 @@
 use crate::prelude::*;
 use alloc::str;
-use alloc::string::String;
 
 use super::file_table::FileDescripter;
 use super::inode_handle::InodeHandle;
@@ -12,19 +11,21 @@ use super::utils::{
 };
 
 lazy_static! {
-    static ref RAM_FS: Arc<dyn FileSystem> = RamFS::new();
+    static ref ROOT_FS: Arc<dyn FileSystem> = RamFS::new(true);
     static ref ROOT_DENTRY: Arc<Dentry> = {
-        fn init() -> Result<Arc<Dentry>> {
-            let root_vnode = Vnode::new(RAM_FS.root_inode())?;
-            Ok(Dentry::new_root(root_vnode))
-        }
-        init().unwrap()
+        let vnode = Vnode::new(ROOT_FS.root_inode()).unwrap();
+        Dentry::new_root(vnode)
     };
     static ref PROC_FS: Arc<dyn FileSystem> = ProcFS::new();
     static ref PROC_DENTRY: Arc<Dentry> = {
         let vnode = Vnode::new(PROC_FS.root_inode()).unwrap();
         Dentry::new_root(vnode)
     };
+    static ref DEV_FS: Arc<dyn FileSystem> = RamFS::new(false);
+    static ref DEV_DENTRY: Arc<Dentry> = {
+        let vnode = Vnode::new(DEV_FS.root_inode()).unwrap();
+        Dentry::new_root(vnode)
+    };
 }
 
 pub struct FsResolver {
@@ -141,6 +142,13 @@ impl FsResolver {
                         path.trim_start_matches('/'),
                         follow_tail_link,
                     )?
+                } else if path.starts_with("/dev") {
+                    let path = path.strip_prefix("/dev").unwrap();
+                    self.lookup_from_parent(
+                        &DEV_DENTRY,
+                        path.trim_start_matches('/'),
+                        follow_tail_link,
+                    )?
                 } else {
                     self.lookup_from_parent(
                         &self.root,

services/libs/jinux-std/src/fs/inode_handle/dyn_cap.rs

@@ -76,6 +76,10 @@ impl FileLike for InodeHandle<Rights> {
         self.dentry().vnode().poll(mask, poller)
     }
 
+    fn ioctl(&self, cmd: IoctlCmd, arg: usize) -> Result<i32> {
+        self.dentry().vnode().ioctl(cmd, arg)
+    }
+
     fn metadata(&self) -> Metadata {
         self.dentry().vnode().metadata()
     }

services/libs/jinux-std/src/fs/inode_handle/mod.rs

@@ -7,7 +7,8 @@ use core::sync::atomic::{AtomicU32, Ordering};
 
 use crate::fs::file_handle::FileLike;
 use crate::fs::utils::{
-    AccessMode, Dentry, DirentVisitor, InodeType, IoEvents, Metadata, Poller, SeekFrom, StatusFlags,
+    AccessMode, Dentry, DirentVisitor, InodeType, IoEvents, IoctlCmd, Metadata, Poller, SeekFrom,
+    StatusFlags,
 };
 use crate::prelude::*;
 use crate::rights::Rights;

services/libs/jinux-std/src/fs/mod.rs

@@ -1,3 +1,4 @@
+pub mod device;
 pub mod epoll;
 pub mod file_handle;
 pub mod file_table;

services/libs/jinux-std/src/fs/procfs/template/dir.rs

@@ -1,10 +1,8 @@
 use core::time::Duration;
-use jinux_frame::vm::VmFrame;
 use jinux_util::slot_vec::SlotVec;
 
-use crate::fs::utils::{
-    DirentVisitor, FileSystem, Inode, InodeMode, InodeType, IoctlCmd, Metadata,
-};
+use crate::fs::device::Device;
+use crate::fs::utils::{DirentVisitor, FileSystem, Inode, InodeMode, InodeType, Metadata};
 use crate::prelude::*;
 
 use super::{ProcFS, ProcInodeInfo};
@@ -78,23 +76,16 @@ impl<D: DirOps + 'static> Inode for ProcDir<D> {
 
     fn set_mtime(&self, _time: Duration) {}
 
-    fn read_page(&self, _idx: usize, _frame: &VmFrame) -> Result<()> {
-        Err(Error::new(Errno::EISDIR))
+    fn create(&self, _name: &str, _type_: InodeType, _mode: InodeMode) -> Result<Arc<dyn Inode>> {
+        Err(Error::new(Errno::EPERM))
     }
 
-    fn write_page(&self, _idx: usize, _frame: &VmFrame) -> Result<()> {
-        Err(Error::new(Errno::EISDIR))
-    }
-
-    fn read_at(&self, _offset: usize, _buf: &mut [u8]) -> Result<usize> {
-        Err(Error::new(Errno::EISDIR))
-    }
-
-    fn write_at(&self, _offset: usize, _buf: &[u8]) -> Result<usize> {
-        Err(Error::new(Errno::EISDIR))
-    }
-
-    fn mknod(&self, _name: &str, _type_: InodeType, _mode: InodeMode) -> Result<Arc<dyn Inode>> {
+    fn mknod(
+        &self,
+        _name: &str,
+        _mode: InodeMode,
+        _device: Arc<dyn Device>,
+    ) -> Result<Arc<dyn Inode>> {
         Err(Error::new(Errno::EPERM))
     }
 
@@ -186,18 +177,6 @@ impl<D: DirOps + 'static> Inode for ProcDir<D> {
         Err(Error::new(Errno::EPERM))
     }
 
-    fn read_link(&self) -> Result<String> {
-        Err(Error::new(Errno::EISDIR))
-    }
-
-    fn write_link(&self, _target: &str) -> Result<()> {
-        Err(Error::new(Errno::EISDIR))
-    }
-
-    fn ioctl(&self, _cmd: &IoctlCmd) -> Result<()> {
-        Err(Error::new(Errno::EISDIR))
-    }
-
     fn sync(&self) -> Result<()> {
         Ok(())
     }

services/libs/jinux-std/src/fs/procfs/template/file.rs

@@ -1,9 +1,7 @@
 use core::time::Duration;
 use jinux_frame::vm::VmFrame;
 
-use crate::fs::utils::{
-    DirentVisitor, FileSystem, Inode, InodeMode, InodeType, IoctlCmd, Metadata,
-};
+use crate::fs::utils::{FileSystem, Inode, InodeMode, IoctlCmd, Metadata};
 use crate::prelude::*;
 
 use super::{ProcFS, ProcInodeInfo};
@@ -72,34 +70,6 @@ impl<F: FileOps + 'static> Inode for ProcFile<F> {
         Err(Error::new(Errno::EPERM))
     }
 
-    fn mknod(&self, _name: &str, _type_: InodeType, _mode: InodeMode) -> Result<Arc<dyn Inode>> {
-        Err(Error::new(Errno::ENOTDIR))
-    }
-
-    fn readdir_at(&self, _offset: usize, _visitor: &mut dyn DirentVisitor) -> Result<usize> {
-        Err(Error::new(Errno::ENOTDIR))
-    }
-
-    fn link(&self, _old: &Arc<dyn Inode>, _name: &str) -> Result<()> {
-        Err(Error::new(Errno::ENOTDIR))
-    }
-
-    fn unlink(&self, _name: &str) -> Result<()> {
-        Err(Error::new(Errno::ENOTDIR))
-    }
-
-    fn rmdir(&self, _name: &str) -> Result<()> {
-        Err(Error::new(Errno::ENOTDIR))
-    }
-
-    fn lookup(&self, _name: &str) -> Result<Arc<dyn Inode>> {
-        Err(Error::new(Errno::ENOTDIR))
-    }
-
-    fn rename(&self, _old_name: &str, _target: &Arc<dyn Inode>, _new_name: &str) -> Result<()> {
-        Err(Error::new(Errno::ENOTDIR))
-    }
-
     fn read_link(&self) -> Result<String> {
         Err(Error::new(Errno::EINVAL))
     }
@@ -108,7 +78,7 @@ impl<F: FileOps + 'static> Inode for ProcFile<F> {
         Err(Error::new(Errno::EINVAL))
     }
 
-    fn ioctl(&self, _cmd: &IoctlCmd) -> Result<()> {
+    fn ioctl(&self, _cmd: IoctlCmd, _arg: usize) -> Result<i32> {
         Err(Error::new(Errno::EPERM))
     }
 

services/libs/jinux-std/src/fs/procfs/template/sym.rs

@@ -1,9 +1,7 @@
 use core::time::Duration;
 use jinux_frame::vm::VmFrame;
 
-use crate::fs::utils::{
-    DirentVisitor, FileSystem, Inode, InodeMode, InodeType, IoctlCmd, Metadata,
-};
+use crate::fs::utils::{FileSystem, Inode, InodeMode, IoctlCmd, Metadata};
 use crate::prelude::*;
 
 use super::{ProcFS, ProcInodeInfo};
@@ -67,34 +65,6 @@ impl<S: SymOps + 'static> Inode for ProcSym<S> {
         Err(Error::new(Errno::EPERM))
     }
 
-    fn mknod(&self, _name: &str, _type_: InodeType, _mode: InodeMode) -> Result<Arc<dyn Inode>> {
-        Err(Error::new(Errno::ENOTDIR))
-    }
-
-    fn readdir_at(&self, _offset: usize, _visitor: &mut dyn DirentVisitor) -> Result<usize> {
-        Err(Error::new(Errno::ENOTDIR))
-    }
-
-    fn link(&self, _old: &Arc<dyn Inode>, _name: &str) -> Result<()> {
-        Err(Error::new(Errno::ENOTDIR))
-    }
-
-    fn unlink(&self, _name: &str) -> Result<()> {
-        Err(Error::new(Errno::ENOTDIR))
-    }
-
-    fn rmdir(&self, _name: &str) -> Result<()> {
-        Err(Error::new(Errno::ENOTDIR))
-    }
-
-    fn lookup(&self, _name: &str) -> Result<Arc<dyn Inode>> {
-        Err(Error::new(Errno::ENOTDIR))
-    }
-
-    fn rename(&self, _old_name: &str, _target: &Arc<dyn Inode>, _new_name: &str) -> Result<()> {
-        Err(Error::new(Errno::ENOTDIR))
-    }
-
     fn read_link(&self) -> Result<String> {
         self.inner.read_link()
     }
@@ -103,7 +73,7 @@ impl<S: SymOps + 'static> Inode for ProcSym<S> {
         Err(Error::new(Errno::EPERM))
     }
 
-    fn ioctl(&self, _cmd: &IoctlCmd) -> Result<()> {
+    fn ioctl(&self, _cmd: IoctlCmd, _arg: usize) -> Result<i32> {
         Err(Error::new(Errno::EPERM))
     }
 

services/libs/jinux-std/src/fs/ramfs/fs.rs

@@ -8,28 +8,40 @@ use jinux_util::slot_vec::SlotVec;
 use spin::{RwLock, RwLockWriteGuard};
 
 use super::*;
+use crate::fs::device::Device;
 use crate::fs::utils::{
-    DirentVisitor, FileSystem, FsFlags, Inode, InodeMode, InodeType, IoctlCmd, Metadata, SuperBlock,
+    DirentVisitor, FileSystem, FsFlags, Inode, InodeMode, InodeType, IoEvents, IoctlCmd, Metadata,
+    Poller, SuperBlock,
 };
 
+/// A volatile file system whose data and metadata exists only in memory.
 pub struct RamFS {
     metadata: RwLock<SuperBlock>,
     root: Arc<RamInode>,
     inode_allocator: AtomicUsize,
+    flags: FsFlags,
 }
 
 impl RamFS {
-    pub fn new() -> Arc<Self> {
+    pub fn new(use_pagecache: bool) -> Arc<Self> {
         let sb = SuperBlock::new(RAMFS_MAGIC, BLOCK_SIZE, NAME_MAX);
         let root = Arc::new(RamInode(RwLock::new(Inode_::new_dir(
             ROOT_INO,
             InodeMode::from_bits_truncate(0o755),
             &sb,
         ))));
+        let flags = {
+            let mut flags = FsFlags::DENTRY_UNEVICTABLE;
+            if !use_pagecache {
+                flags |= FsFlags::NO_PAGECACHE;
+            }
+            flags
+        };
         let ramfs = Arc::new(Self {
             metadata: RwLock::new(sb),
             root,
             inode_allocator: AtomicUsize::new(ROOT_INO + 1),
+            flags,
         });
         let mut root = ramfs.root.0.write();
         root.inner
@@ -64,7 +76,7 @@ impl FileSystem for RamFS {
     }
 
     fn flags(&self) -> FsFlags {
-        FsFlags::DENTRY_UNEVICTABLE
+        self.flags
     }
 }
 
@@ -105,6 +117,22 @@ impl Inode_ {
         }
     }
 
+    pub fn new_device(
+        ino: usize,
+        mode: InodeMode,
+        sb: &SuperBlock,
+        device: Arc<dyn Device>,
+    ) -> Self {
+        let type_ = device.type_();
+        let rdev = device.id().into();
+        Self {
+            inner: Inner::Device(device),
+            metadata: Metadata::new_device(ino, mode, sb, type_, rdev),
+            this: Weak::default(),
+            fs: Weak::default(),
+        }
+    }
+
     pub fn inc_size(&mut self) {
         self.metadata.size += 1;
         self.metadata.blocks = (self.metadata.size + BLOCK_SIZE - 1) / BLOCK_SIZE;
@@ -126,6 +154,7 @@ enum Inner {
     Dir(DirEntry),
     File,
     SymLink(Str256),
+    Device(Arc<dyn Device>),
 }
 
 impl Inner {
@@ -156,6 +185,13 @@ impl Inner {
             _ => None,
         }
     }
+
+    fn as_device(&self) -> Option<&Arc<dyn Device>> {
+        match self {
+            Inner::Device(device) => Some(device),
+            _ => None,
+        }
+    }
 }
 
 struct DirEntry {
@@ -320,11 +356,17 @@ impl Inode for RamInode {
         Ok(())
     }
 
-    fn read_at(&self, offset: usize, buf: &mut [u8]) -> Result<usize> {
+    fn read_at(&self, _offset: usize, buf: &mut [u8]) -> Result<usize> {
+        if let Some(device) = self.0.read().inner.as_device() {
+            return device.read(buf);
+        }
         return_errno_with_message!(Errno::EOPNOTSUPP, "direct read is not supported");
     }
 
-    fn write_at(&self, offset: usize, buf: &[u8]) -> Result<usize> {
+    fn write_at(&self, _offset: usize, buf: &[u8]) -> Result<usize> {
+        if let Some(device) = self.0.read().inner.as_device() {
+            return device.write(buf);
+        }
         return_errno_with_message!(Errno::EOPNOTSUPP, "direct write is not supported");
     }
 
@@ -352,7 +394,41 @@ impl Inode for RamInode {
         self.0.write().metadata.mtime = time;
     }
 
-    fn mknod(&self, name: &str, type_: InodeType, mode: InodeMode) -> Result<Arc<dyn Inode>> {
+    fn mknod(
+        &self,
+        name: &str,
+        mode: InodeMode,
+        device: Arc<dyn Device>,
+    ) -> Result<Arc<dyn Inode>> {
+        if self.0.read().metadata.type_ != InodeType::Dir {
+            return_errno_with_message!(Errno::ENOTDIR, "self is not dir");
+        }
+        let mut self_inode = self.0.write();
+        if self_inode.inner.as_direntry().unwrap().contains_entry(name) {
+            return_errno_with_message!(Errno::EEXIST, "entry exists");
+        }
+        let device_inode = {
+            let fs = self_inode.fs.upgrade().unwrap();
+            let device_inode = Arc::new(RamInode(RwLock::new(Inode_::new_device(
+                fs.alloc_id(),
+                mode,
+                &fs.sb(),
+                device,
+            ))));
+            device_inode.0.write().fs = self_inode.fs.clone();
+            device_inode.0.write().this = Arc::downgrade(&device_inode);
+            device_inode
+        };
+        self_inode
+            .inner
+            .as_direntry_mut()
+            .unwrap()
+            .append_entry(name, device_inode.clone());
+        self_inode.inc_size();
+        Ok(device_inode)
+    }
+
+    fn create(&self, name: &str, type_: InodeType, mode: InodeMode) -> Result<Arc<dyn Inode>> {
         if self.0.read().metadata.type_ != InodeType::Dir {
             return_errno_with_message!(Errno::ENOTDIR, "self is not dir");
         }
@@ -631,12 +707,24 @@ impl Inode for RamInode {
         Ok(())
     }
 
+    fn poll(&self, mask: IoEvents, poller: Option<&Poller>) -> IoEvents {
+        if let Some(device) = self.0.read().inner.as_device() {
+            device.poll(mask, poller)
+        } else {
+            let events = IoEvents::IN | IoEvents::OUT;
+            events & mask
+        }
+    }
+
     fn fs(&self) -> Arc<dyn FileSystem> {
         Weak::upgrade(&self.0.read().fs).unwrap()
     }
 
-    fn ioctl(&self, cmd: &IoctlCmd) -> Result<()> {
-        return_errno!(Errno::ENOSYS);
+    fn ioctl(&self, cmd: IoctlCmd, arg: usize) -> Result<i32> {
+        if let Some(device) = self.0.read().inner.as_device() {
+            return device.ioctl(cmd, arg);
+        }
+        return_errno_with_message!(Errno::EINVAL, "ioctl is not supported");
     }
 }
 

services/libs/jinux-std/src/fs/stdio.rs

@@ -1,6 +1,7 @@
+use crate::device::tty::{get_n_tty, Tty};
 use crate::prelude::*;
-use crate::tty::{get_n_tty, Tty};
 
+use super::device::Device;
 use super::file_handle::FileLike;
 use super::file_table::FileDescripter;
 use super::utils::{InodeMode, InodeType, IoEvents, Metadata, Poller, SeekFrom};

services/libs/jinux-std/src/fs/utils/dentry_cache.rs

@@ -1,4 +1,6 @@
+use crate::fs::device::Device;
 use crate::prelude::*;
+
 use alloc::string::String;
 use core::time::Duration;
 
@@ -76,7 +78,26 @@ impl Dentry {
         }
 
         let child = {
-            let vnode = self.vnode.mknod(name, type_, mode)?;
+            let vnode = self.vnode.create(name, type_, mode)?;
+            let dentry = Dentry::new(name, Some(self.this()), vnode);
+            children.insert_dentry(&dentry);
+            dentry
+        };
+        Ok(child)
+    }
+
+    /// Create a dentry by making a device inode.
+    pub fn mknod(&self, name: &str, mode: InodeMode, device: Arc<dyn Device>) -> Result<Arc<Self>> {
+        if self.vnode.inode_type() != InodeType::Dir {
+            return_errno!(Errno::ENOTDIR);
+        }
+        let mut children = self.children.lock();
+        if children.find_dentry(name).is_some() {
+            return_errno!(Errno::EEXIST);
+        }
+
+        let child = {
+            let vnode = self.vnode.mknod(name, mode, device)?;
             let dentry = Dentry::new(name, Some(self.this()), vnode);
             children.insert_dentry(&dentry);
             dentry

services/libs/jinux-std/src/fs/utils/inode.rs

@@ -6,6 +6,7 @@ use core::time::Duration;
 use jinux_frame::vm::VmFrame;
 
 use super::{DirentVisitor, FileSystem, IoEvents, IoctlCmd, Poller, SuperBlock};
+use crate::fs::device::{Device, DeviceType};
 use crate::prelude::*;
 
 #[repr(u32)]
@@ -20,6 +21,15 @@ pub enum InodeType {
     Socket = 0o140000,
 }
 
+impl From<DeviceType> for InodeType {
+    fn from(type_: DeviceType) -> InodeType {
+        match type_ {
+            DeviceType::CharDevice => InodeType::CharDevice,
+            DeviceType::BlockDevice => InodeType::BlockDevice,
+        }
+    }
+}
+
 bitflags! {
     pub struct InodeMode: u16 {
         /// set-user-ID
@@ -77,7 +87,7 @@ impl InodeMode {
 
 #[derive(Debug, Clone)]
 pub struct Metadata {
-    pub dev: usize,
+    pub dev: u64,
     pub ino: usize,
     pub size: usize,
     pub blk_size: usize,
@@ -90,7 +100,7 @@ pub struct Metadata {
     pub nlinks: usize,
     pub uid: usize,
     pub gid: usize,
-    pub rdev: usize,
+    pub rdev: u64,
 }
 
 impl Metadata {
@@ -150,6 +160,30 @@ impl Metadata {
             rdev: 0,
         }
     }
+    pub fn new_device(
+        ino: usize,
+        mode: InodeMode,
+        sb: &SuperBlock,
+        type_: DeviceType,
+        rdev: u64,
+    ) -> Self {
+        Self {
+            dev: 0,
+            ino,
+            size: 0,
+            blk_size: sb.bsize,
+            blocks: 0,
+            atime: Default::default(),
+            mtime: Default::default(),
+            ctime: Default::default(),
+            type_: InodeType::from(type_),
+            mode,
+            nlinks: 1,
+            uid: 0,
+            gid: 0,
+            rdev,
+        }
+    }
 }
 
 pub trait Inode: Any + Sync + Send {
@@ -167,33 +201,65 @@ pub trait Inode: Any + Sync + Send {
 
     fn set_mtime(&self, time: Duration);
 
-    fn read_page(&self, idx: usize, frame: &VmFrame) -> Result<()>;
+    fn read_page(&self, idx: usize, frame: &VmFrame) -> Result<()> {
+        Err(Error::new(Errno::EISDIR))
+    }
 
-    fn write_page(&self, idx: usize, frame: &VmFrame) -> Result<()>;
+    fn write_page(&self, idx: usize, frame: &VmFrame) -> Result<()> {
+        Err(Error::new(Errno::EISDIR))
+    }
 
-    fn read_at(&self, offset: usize, buf: &mut [u8]) -> Result<usize>;
+    fn read_at(&self, offset: usize, buf: &mut [u8]) -> Result<usize> {
+        Err(Error::new(Errno::EISDIR))
+    }
 
-    fn write_at(&self, offset: usize, buf: &[u8]) -> Result<usize>;
+    fn write_at(&self, offset: usize, buf: &[u8]) -> Result<usize> {
+        Err(Error::new(Errno::EISDIR))
+    }
 
-    fn mknod(&self, name: &str, type_: InodeType, mode: InodeMode) -> Result<Arc<dyn Inode>>;
+    fn create(&self, name: &str, type_: InodeType, mode: InodeMode) -> Result<Arc<dyn Inode>> {
+        Err(Error::new(Errno::ENOTDIR))
+    }
 
-    fn readdir_at(&self, offset: usize, visitor: &mut dyn DirentVisitor) -> Result<usize>;
+    fn mknod(&self, name: &str, mode: InodeMode, dev: Arc<dyn Device>) -> Result<Arc<dyn Inode>> {
+        Err(Error::new(Errno::ENOTDIR))
+    }
 
-    fn link(&self, old: &Arc<dyn Inode>, name: &str) -> Result<()>;
+    fn readdir_at(&self, offset: usize, visitor: &mut dyn DirentVisitor) -> Result<usize> {
+        Err(Error::new(Errno::ENOTDIR))
+    }
 
-    fn unlink(&self, name: &str) -> Result<()>;
+    fn link(&self, old: &Arc<dyn Inode>, name: &str) -> Result<()> {
+        Err(Error::new(Errno::ENOTDIR))
+    }
 
-    fn rmdir(&self, name: &str) -> Result<()>;
+    fn unlink(&self, name: &str) -> Result<()> {
+        Err(Error::new(Errno::ENOTDIR))
+    }
 
-    fn lookup(&self, name: &str) -> Result<Arc<dyn Inode>>;
+    fn rmdir(&self, name: &str) -> Result<()> {
+        Err(Error::new(Errno::ENOTDIR))
+    }
 
-    fn rename(&self, old_name: &str, target: &Arc<dyn Inode>, new_name: &str) -> Result<()>;
+    fn lookup(&self, name: &str) -> Result<Arc<dyn Inode>> {
+        Err(Error::new(Errno::ENOTDIR))
+    }
 
-    fn read_link(&self) -> Result<String>;
+    fn rename(&self, old_name: &str, target: &Arc<dyn Inode>, new_name: &str) -> Result<()> {
+        Err(Error::new(Errno::ENOTDIR))
+    }
 
-    fn write_link(&self, target: &str) -> Result<()>;
+    fn read_link(&self) -> Result<String> {
+        Err(Error::new(Errno::EISDIR))
+    }
 
-    fn ioctl(&self, cmd: &IoctlCmd) -> Result<()>;
+    fn write_link(&self, target: &str) -> Result<()> {
+        Err(Error::new(Errno::EISDIR))
+    }
+
+    fn ioctl(&self, cmd: IoctlCmd, arg: usize) -> Result<i32> {
+        Err(Error::new(Errno::EISDIR))
+    }
 
     fn sync(&self) -> Result<()>;
 

services/libs/jinux-std/src/fs/utils/vnode.rs

@@ -1,9 +1,12 @@
 use super::{
-    DirentVisitor, FsFlags, Inode, InodeMode, InodeType, IoEvents, Metadata, PageCache, Poller,
+    DirentVisitor, FsFlags, Inode, InodeMode, InodeType, IoEvents, IoctlCmd, Metadata, PageCache,
+    Poller,
 };
+use crate::fs::device::Device;
 use crate::prelude::*;
 use crate::rights::Full;
 use crate::vm::vmo::Vmo;
+
 use alloc::string::String;
 use core::time::Duration;
 use jinux_frame::vm::VmIo;
@@ -145,8 +148,13 @@ impl Vnode {
         inner.inode.read_at(0, &mut buf[..file_len])
     }
 
-    pub fn mknod(&self, name: &str, type_: InodeType, mode: InodeMode) -> Result<Self> {
-        let inode = self.inner.read().inode.mknod(name, type_, mode)?;
+    pub fn create(&self, name: &str, type_: InodeType, mode: InodeMode) -> Result<Self> {
+        let inode = self.inner.read().inode.create(name, type_, mode)?;
+        Self::new(inode)
+    }
+
+    pub fn mknod(&self, name: &str, mode: InodeMode, device: Arc<dyn Device>) -> Result<Self> {
+        let inode = self.inner.read().inode.mknod(name, mode, device)?;
         Self::new(inode)
     }
 
@@ -190,6 +198,10 @@ impl Vnode {
         self.inner.read().inode.poll(mask, poller)
     }
 
+    pub fn ioctl(&self, cmd: IoctlCmd, arg: usize) -> Result<i32> {
+        self.inner.read().inode.ioctl(cmd, arg)
+    }
+
     pub fn metadata(&self) -> Metadata {
         self.inner.read().inode.metadata()
     }

services/libs/jinux-std/src/lib.rs

@@ -31,6 +31,7 @@ extern crate lru;
 #[macro_use]
 extern crate controlled;
 
+pub mod device;
 pub mod driver;
 pub mod error;
 pub mod events;
@@ -41,7 +42,6 @@ pub mod rights;
 pub mod syscall;
 pub mod thread;
 pub mod time;
-pub mod tty;
 mod util;
 pub mod vm;
 
@@ -49,6 +49,7 @@ pub fn init(ramdisk: &[u8]) {
     driver::init();
     process::fifo_scheduler::init();
     fs::initramfs::init(ramdisk).unwrap();
+    device::init().unwrap();
 }
 
 fn init_thread() {

services/libs/jinux-std/src/process/mod.rs

@@ -11,13 +11,13 @@ use self::signal::sig_queues::SigQueues;
 use self::signal::signals::kernel::KernelSignal;
 use self::signal::signals::Signal;
 use self::status::ProcessStatus;
+use crate::device::tty::get_n_tty;
 use crate::fs::file_table::FileTable;
 use crate::fs::fs_resolver::FsResolver;
 use crate::fs::utils::FileCreationMask;
 use crate::prelude::*;
 use crate::rights::Full;
 use crate::thread::{allocate_tid, thread_table, Thread};
-use crate::tty::get_n_tty;
 use crate::vm::vmar::Vmar;
 use jinux_frame::sync::WaitQueue;
 

services/libs/jinux-std/src/syscall/open.rs

@@ -6,7 +6,6 @@ use crate::fs::{
 use crate::log_syscall_entry;
 use crate::prelude::*;
 use crate::syscall::constants::MAX_FILENAME_LEN;
-use crate::tty::get_n_tty;
 use crate::util::read_cstring_from_user;
 
 use super::SyscallReturn;
@@ -46,14 +45,6 @@ pub fn sys_openat(
         return Ok(SyscallReturn::Return(fd as _));
     }
 
-    if dirfd == AT_FDCWD && pathname == CString::new("/dev/tty")? {
-        let tty_file = get_n_tty().clone();
-        let current = current!();
-        let mut file_table = current.file_table().lock();
-        let fd = file_table.insert(tty_file);
-        return Ok(SyscallReturn::Return(fd as _));
-    }
-
     // The common path
     let current = current!();
     let file_handle = {

services/libs/jinux-std/src/syscall/stat.rs

@@ -81,7 +81,7 @@ pub const S_IFLNK: u32 = 0o120000;
 #[repr(C)]
 pub struct Stat {
     /// ID of device containing file
-    st_dev: usize,
+    st_dev: u64,
     /// Inode number
     st_ino: usize,
     /// Number of hard links
@@ -95,7 +95,7 @@ pub struct Stat {
     /// Padding bytes
     __pad0: u32,
     /// Device ID (if special file)
-    st_rdev: usize,
+    st_rdev: u64,
     /// Total size, in bytes
     st_size: isize,
     /// Block size for filesystem I/O
@@ -122,7 +122,7 @@ impl From<Metadata> for Stat {
             st_uid: info.uid as u32,
             st_gid: info.gid as u32,
             __pad0: 0,
-            st_rdev: 0,
+            st_rdev: info.rdev,
             st_size: info.size as isize,
             st_blksize: info.blk_size as isize,
             st_blocks: (info.blocks * (info.blk_size / 512)) as isize, // Number of 512B blocks