Refactor project structure

kernel/aster-nix/src/syscall/chdir.rs

@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: MPL-2.0
+
+use super::{SyscallReturn, SYS_CHDIR, SYS_FCHDIR};
+use crate::{
+    fs::{
+        file_table::FileDescripter, fs_resolver::FsPath, inode_handle::InodeHandle,
+        utils::InodeType,
+    },
+    log_syscall_entry,
+    prelude::*,
+    syscall::constants::MAX_FILENAME_LEN,
+    util::read_cstring_from_user,
+};
+
+pub fn sys_chdir(pathname_addr: Vaddr) -> Result<SyscallReturn> {
+    log_syscall_entry!(SYS_CHDIR);
+    let pathname = read_cstring_from_user(pathname_addr, MAX_FILENAME_LEN)?;
+    debug!("pathname = {:?}", pathname);
+
+    let current = current!();
+    let mut fs = current.fs().write();
+    let dentry = {
+        let pathname = pathname.to_string_lossy();
+        if pathname.is_empty() {
+            return_errno_with_message!(Errno::ENOENT, "path is empty");
+        }
+        let fs_path = FsPath::try_from(pathname.as_ref())?;
+        fs.lookup(&fs_path)?
+    };
+    if dentry.type_() != InodeType::Dir {
+        return_errno_with_message!(Errno::ENOTDIR, "must be directory");
+    }
+    fs.set_cwd(dentry);
+    Ok(SyscallReturn::Return(0))
+}
+
+pub fn sys_fchdir(fd: FileDescripter) -> Result<SyscallReturn> {
+    log_syscall_entry!(SYS_FCHDIR);
+    debug!("fd = {}", fd);
+
+    let current = current!();
+    let dentry = {
+        let file_table = current.file_table().lock();
+        let file = file_table.get_file(fd)?;
+        let inode_handle = file
+            .downcast_ref::<InodeHandle>()
+            .ok_or(Error::with_message(Errno::EBADF, "not inode"))?;
+        inode_handle.dentry().clone()
+    };
+    if dentry.type_() != InodeType::Dir {
+        return_errno_with_message!(Errno::ENOTDIR, "must be directory");
+    }
+    current.fs().write().set_cwd(dentry);
+    Ok(SyscallReturn::Return(0))
+}