Remove the shim kernel crate

kernel/src/syscall/symlink.rs

@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: MPL-2.0
+
+use super::SyscallReturn;
+use crate::{
+    fs::{
+        file_table::FileDesc,
+        fs_resolver::{FsPath, AT_FDCWD},
+        utils::{InodeMode, InodeType},
+    },
+    prelude::*,
+    syscall::constants::MAX_FILENAME_LEN,
+};
+
+pub fn sys_symlinkat(
+    target_addr: Vaddr,
+    dirfd: FileDesc,
+    linkpath_addr: Vaddr,
+    ctx: &Context,
+) -> Result<SyscallReturn> {
+    let user_space = ctx.get_user_space();
+    let target = user_space.read_cstring(target_addr, MAX_FILENAME_LEN)?;
+    let linkpath = user_space.read_cstring(linkpath_addr, MAX_FILENAME_LEN)?;
+    debug!(
+        "target = {:?}, dirfd = {}, linkpath = {:?}",
+        target, dirfd, linkpath
+    );
+
+    let target = target.to_string_lossy();
+    if target.is_empty() {
+        return_errno_with_message!(Errno::ENOENT, "target is empty");
+    }
+    let (dir_dentry, link_name) = {
+        let linkpath = linkpath.to_string_lossy();
+        if linkpath.is_empty() {
+            return_errno_with_message!(Errno::ENOENT, "linkpath is empty");
+        }
+        let fs_path = FsPath::new(dirfd, linkpath.as_ref())?;
+        ctx.process
+            .fs()
+            .read()
+            .lookup_dir_and_new_basename(&fs_path, false)?
+    };
+
+    let new_dentry = dir_dentry.new_fs_child(
+        &link_name,
+        InodeType::SymLink,
+        InodeMode::from_bits_truncate(0o777),
+    )?;
+    new_dentry.inode().write_link(&target)?;
+    Ok(SyscallReturn::Return(0))
+}
+
+pub fn sys_symlink(
+    target_addr: Vaddr,
+    linkpath_addr: Vaddr,
+    ctx: &Context,
+) -> Result<SyscallReturn> {
+    self::sys_symlinkat(target_addr, AT_FDCWD, linkpath_addr, ctx)
+}