Remove the shim kernel crate

kernel/src/syscall/rename.rs

@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: MPL-2.0
+
+use super::SyscallReturn;
+use crate::{
+    fs::{
+        file_table::FileDesc,
+        fs_resolver::{FsPath, AT_FDCWD},
+        utils::InodeType,
+    },
+    prelude::*,
+    syscall::constants::MAX_FILENAME_LEN,
+};
+
+pub fn sys_renameat(
+    old_dirfd: FileDesc,
+    old_path_addr: Vaddr,
+    new_dirfd: FileDesc,
+    new_path_addr: Vaddr,
+    ctx: &Context,
+) -> Result<SyscallReturn> {
+    let user_space = ctx.get_user_space();
+    let old_path = user_space.read_cstring(old_path_addr, MAX_FILENAME_LEN)?;
+    let new_path = user_space.read_cstring(new_path_addr, MAX_FILENAME_LEN)?;
+    debug!(
+        "old_dirfd = {}, old_path = {:?}, new_dirfd = {}, new_path = {:?}",
+        old_dirfd, old_path, new_dirfd, new_path
+    );
+
+    let fs = ctx.process.fs().read();
+
+    let (old_dir_dentry, old_name) = {
+        let old_path = old_path.to_string_lossy();
+        if old_path.is_empty() {
+            return_errno_with_message!(Errno::ENOENT, "oldpath is empty");
+        }
+        let old_fs_path = FsPath::new(old_dirfd, old_path.as_ref())?;
+        fs.lookup_dir_and_base_name(&old_fs_path)?
+    };
+    let old_dentry = old_dir_dentry.lookup(&old_name)?;
+
+    let (new_dir_dentry, new_name) = {
+        let new_path = new_path.to_string_lossy();
+        if new_path.is_empty() {
+            return_errno_with_message!(Errno::ENOENT, "newpath is empty");
+        }
+        if new_path.ends_with('/') && old_dentry.type_() != InodeType::Dir {
+            return_errno_with_message!(Errno::ENOTDIR, "oldpath is not dir");
+        }
+        let new_fs_path = FsPath::new(new_dirfd, new_path.as_ref().trim_end_matches('/'))?;
+        fs.lookup_dir_and_base_name(&new_fs_path)?
+    };
+
+    // Check abs_path
+    let old_abs_path = old_dentry.abs_path();
+    let new_abs_path = new_dir_dentry.abs_path() + "/" + &new_name;
+    if new_abs_path.starts_with(&old_abs_path) {
+        if new_abs_path.len() == old_abs_path.len() {
+            return Ok(SyscallReturn::Return(0));
+        } else {
+            return_errno_with_message!(
+                Errno::EINVAL,
+                "newpath contains a path prefix of the oldpath"
+            );
+        }
+    }
+
+    old_dir_dentry.rename(&old_name, &new_dir_dentry, &new_name)?;
+
+    Ok(SyscallReturn::Return(0))
+}
+
+pub fn sys_rename(
+    old_path_addr: Vaddr,
+    new_path_addr: Vaddr,
+    ctx: &Context,
+) -> Result<SyscallReturn> {
+    self::sys_renameat(AT_FDCWD, old_path_addr, AT_FDCWD, new_path_addr, ctx)
+}