diff --git a/crates/fs/src/ensure_file.rs b/crates/fs/src/ensure_file.rs
new file mode 100644
index 00000000..58bca3bf
--- /dev/null
+++ b/crates/fs/src/ensure_file.rs
@@ -0,0 +1,66 @@
+use derive_more::{Display, Error};
+use miette::Diagnostic;
+use std::{
+    fs::{self, OpenOptions},
+    io::{self, Write},
+    path::{Path, PathBuf},
+};
+
+/// Error type of [`ensure_file`].
+#[derive(Debug, Display, Error, Diagnostic)]
+pub enum EnsureFileError {
+    #[display("Failed to create the parent directory at {parent_dir:?}: {error}")]
+    CreateDir {
+        parent_dir: PathBuf,
+        #[error(source)]
+        error: io::Error,
+    },
+    #[display("Failed to create file at {file_path:?}: {error}")]
+    CreateFile {
+        file_path: PathBuf,
+        #[error(source)]
+        error: io::Error,
+    },
+    #[display("Failed to write to file at {file_path:?}: {error}")]
+    WriteFile {
+        file_path: PathBuf,
+        #[error(source)]
+        error: io::Error,
+    },
+}
+
+/// Write `content` to `file_path` unless it already exists.
+///
+/// Ancestor directories will be created if they don't already exist.
+pub fn ensure_file(
+    file_path: &Path,
+    content: &[u8],
+    #[cfg_attr(windows, allow(unused))] mode: Option<u32>,
+) -> Result<(), EnsureFileError> {
+    if file_path.exists() {
+        return Ok(());
+    }
+
+    let parent_dir = file_path.parent().unwrap();
+    fs::create_dir_all(parent_dir).map_err(|error| EnsureFileError::CreateDir {
+        parent_dir: parent_dir.to_path_buf(),
+        error,
+    })?;
+
+    let mut options = OpenOptions::new();
+    options.write(true).create(true);
+
+    #[cfg(unix)]
+    {
+        use std::os::unix::fs::OpenOptionsExt;
+        if let Some(mode) = mode {
+            options.mode(mode);
+        }
+    }
+
+    options
+        .open(file_path)
+        .map_err(|error| EnsureFileError::CreateFile { file_path: file_path.to_path_buf(), error })?
+        .write_all(content)
+        .map_err(|error| EnsureFileError::WriteFile { file_path: file_path.to_path_buf(), error })
+}
diff --git a/crates/fs/src/file_mode.rs b/crates/fs/src/file_mode.rs
new file mode 100644
index 00000000..04ffed14
--- /dev/null
+++ b/crates/fs/src/file_mode.rs
@@ -0,0 +1,32 @@
+use std::io;
+
+/// Bit mask to filter executable bits (`--x--x--x`).
+pub const EXEC_MASK: u32 = 0b001_001_001;
+
+/// All can read and execute, but only owner can write (`rwxr-xr-x`).
+pub const EXEC_MODE: u32 = 0b111_101_101;
+
+/// Whether a file mode has all executable bits.
+pub fn is_all_exec(mode: u32) -> bool {
+    mode & EXEC_MASK == EXEC_MASK
+}
+
+/// Set file mode to 777 on POSIX platforms such as Linux or macOS,
+/// or do nothing on Windows.
+#[cfg_attr(windows, allow(unused))]
+pub fn make_file_executable(file: &std::fs::File) -> io::Result<()> {
+    #[cfg(unix)]
+    return {
+        use std::{
+            fs::Permissions,
+            os::unix::fs::{MetadataExt, PermissionsExt},
+        };
+        let mode = file.metadata()?.mode();
+        let mode = mode | EXEC_MASK;
+        let permissions = Permissions::from_mode(mode);
+        file.set_permissions(permissions)
+    };
+
+    #[cfg(windows)]
+    return Ok(());
+}
diff --git a/crates/fs/src/lib.rs b/crates/fs/src/lib.rs
index cd1d039b..0e489da8 100644
--- a/crates/fs/src/lib.rs
+++ b/crates/fs/src/lib.rs
@@ -1,109 +1,7 @@
-use derive_more::{Display, Error};
-use miette::Diagnostic;
-use std::{
-    fs::{self, OpenOptions},
-    io::{self, Write},
-    path::{Path, PathBuf},
-};
+mod ensure_file;
+mod symlink_dir;
 
-pub mod file_mode {
-    /// Bit mask to filter executable bits (`--x--x--x`).
-    pub const EXEC_MASK: u32 = 0b001_001_001;
+pub use ensure_file::*;
+pub use symlink_dir::*;
 
-    /// All can read and execute, but only owner can write (`rwxr-xr-x`).
-    pub const EXEC_MODE: u32 = 0b111_101_101;
-
-    /// Whether a file mode has all executable bits.
-    pub fn is_all_exec(mode: u32) -> bool {
-        mode & EXEC_MASK == EXEC_MASK
-    }
-}
-
-/// Create a symlink to a directory.
-///
-/// The `link` path will be a symbolic link pointing to `original`.
-pub fn symlink_dir(original: &Path, link: &Path) -> io::Result<()> {
-    #[cfg(unix)]
-    return std::os::unix::fs::symlink(original, link);
-    #[cfg(windows)]
-    return junction::create(original, link); // junctions instead of symlinks because symlinks may require elevated privileges.
-}
-
-/// Error type of [`ensure_file`].
-#[derive(Debug, Display, Error, Diagnostic)]
-pub enum EnsureFileError {
-    #[display("Failed to create the parent directory at {parent_dir:?}: {error}")]
-    CreateDir {
-        parent_dir: PathBuf,
-        #[error(source)]
-        error: io::Error,
-    },
-    #[display("Failed to create file at {file_path:?}: {error}")]
-    CreateFile {
-        file_path: PathBuf,
-        #[error(source)]
-        error: io::Error,
-    },
-    #[display("Failed to write to file at {file_path:?}: {error}")]
-    WriteFile {
-        file_path: PathBuf,
-        #[error(source)]
-        error: io::Error,
-    },
-}
-
-/// Write `content` to `file_path` unless it already exists.
-///
-/// Ancestor directories will be created if they don't already exist.
-pub fn ensure_file(
-    file_path: &Path,
-    content: &[u8],
-    #[cfg_attr(windows, allow(unused))] mode: Option<u32>,
-) -> Result<(), EnsureFileError> {
-    if file_path.exists() {
-        return Ok(());
-    }
-
-    let parent_dir = file_path.parent().unwrap();
-    fs::create_dir_all(parent_dir).map_err(|error| EnsureFileError::CreateDir {
-        parent_dir: parent_dir.to_path_buf(),
-        error,
-    })?;
-
-    let mut options = OpenOptions::new();
-    options.write(true).create(true);
-
-    #[cfg(unix)]
-    {
-        use std::os::unix::fs::OpenOptionsExt;
-        if let Some(mode) = mode {
-            options.mode(mode);
-        }
-    }
-
-    options
-        .open(file_path)
-        .map_err(|error| EnsureFileError::CreateFile { file_path: file_path.to_path_buf(), error })?
-        .write_all(content)
-        .map_err(|error| EnsureFileError::WriteFile { file_path: file_path.to_path_buf(), error })
-}
-
-/// Set file mode to 777 on POSIX platforms such as Linux or macOS,
-/// or do nothing on Windows.
-#[cfg_attr(windows, allow(unused))]
-pub fn make_file_executable(file: &std::fs::File) -> io::Result<()> {
-    #[cfg(unix)]
-    return {
-        use std::{
-            fs::Permissions,
-            os::unix::fs::{MetadataExt, PermissionsExt},
-        };
-        let mode = file.metadata()?.mode();
-        let mode = mode | file_mode::EXEC_MASK;
-        let permissions = Permissions::from_mode(mode);
-        file.set_permissions(permissions)
-    };
-
-    #[cfg(windows)]
-    return Ok(());
-}
+pub mod file_mode;
diff --git a/crates/fs/src/symlink_dir.rs b/crates/fs/src/symlink_dir.rs
new file mode 100644
index 00000000..08c68721
--- /dev/null
+++ b/crates/fs/src/symlink_dir.rs
@@ -0,0 +1,11 @@
+use std::{io, path::Path};
+
+/// Create a symlink to a directory.
+///
+/// The `link` path will be a symbolic link pointing to `original`.
+pub fn symlink_dir(original: &Path, link: &Path) -> io::Result<()> {
+    #[cfg(unix)]
+    return std::os::unix::fs::symlink(original, link);
+    #[cfg(windows)]
+    return junction::create(original, link); // junctions instead of symlinks because symlinks may require elevated privileges.
+}
diff --git a/tasks/integrated-benchmark/src/work_env.rs b/tasks/integrated-benchmark/src/work_env.rs
index f192ad86..74cbd377 100644
--- a/tasks/integrated-benchmark/src/work_env.rs
+++ b/tasks/integrated-benchmark/src/work_env.rs
@@ -5,7 +5,7 @@ use crate::{
 };
 use itertools::Itertools;
 use os_display::Quotable;
-use pacquet_fs::make_file_executable;
+use pacquet_fs::file_mode::make_file_executable;
 use pipe_trait::Pipe;
 use std::{
     borrow::Cow,