From: Roy7Kim <myoungwoon.kim@samsung.com>
Date: Mon, 13 Mar 2023 09:09:26 +0000 (+0900)
Subject: Import fs-err 2.9.0
X-Git-Tag: upstream/2.9.0
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b4d868724f81c291fa772c9dbc01dd5e63ce1ddb;p=platform%2Fupstream%2Frust-fs-err.git

Import fs-err 2.9.0
---

b4d868724f81c291fa772c9dbc01dd5e63ce1ddb
diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
new file mode 100644
index 0000000..1114130
--- /dev/null
+++ b/.cargo_vcs_info.json
@@ -0,0 +1,6 @@
+{
+  "git": {
+    "sha1": "3f59ce2d8a8fc1bbd267eac6848fb9d683542769"
+  },
+  "path_in_vcs": ""
+}
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..aa4079e
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,72 @@
+# fs-err Changelog
+
+## 2.9.0
+
+* Add wrappers for [`tokio::fs`](https://docs.rs/tokio/latest/tokio/fs/index.html) ([#40](https://github.com/andrewhickman/fs-err/pull/40)).
+
+## 2.8.1
+
+* Fixed docs.rs build
+
+## 2.8.0
+
+* Implement I/O safety traits (`AsFd`/`AsHandle`, `Into<OwnedFd>`/`Into<OwnedHandle>`) for file. This feature requires Rust 1.63 or later and is gated behind the `io_safety` feature flag. ([#39](https://github.com/andrewhickman/fs-err/pull/39))
+
+## 2.7.0
+
+* Implement `From<fs_err::File> for std::fs::File` ([#38](https://github.com/andrewhickman/fs-err/pull/38))
+
+## 2.6.0
+
+* Added [`File::into_parts`](https://docs.rs/fs-err/2.6.0/fs_err/struct.File.html#method.into_parts) and [`File::file_mut`](https://docs.rs/fs-err/2.6.0/fs_err/struct.File.html#method.file_mut) to provide more access to the underlying `std::fs::File`.
+* Fixed some typos in documention ([#33](https://github.com/andrewhickman/fs-err/pull/33))
+
+## 2.5.0
+* Added `symlink` for unix platforms
+* Added `symlink_file` and `symlink_dir` for windows
+* Implemented os-specific extension traits for `File`
+  - `std::os::unix::io::{AsRawFd, IntoRawFd}`
+  - `std::os::windows::io::{AsRawHandle, IntoRawHandle}`
+  - Added trait wrappers for `std::os::{unix, windows}::fs::FileExt` and implemented them for `fs_err::File`
+* Implemented os-specific extension traits for `OpenOptions`
+  - Added trait wrappers for `std::os::{unix, windows}::fs::OpenOptionsExt` and implemented them for `fs_err::OpenOptions`
+* Improved compile times by converting arguments early and forwarding only a small number of types internally. There will be a slight performance hit only in the error case.
+* Reduced trait bounds on generics from `AsRef<Path> + Into<PathBuf>` to either `AsRef<Path>` or `Into<PathBuf>`, making the functions more general.
+
+## 2.4.0
+* Added `canonicalize`, `hard link`, `read_link`, `rename`, `symlink_metadata` and `soft_link`. ([#25](https://github.com/andrewhickman/fs-err/pull/25))
+* Added aliases to `std::path::Path` via extension trait ([#26](https://github.com/andrewhickman/fs-err/pull/26))
+* Added `OpenOptions` ([#27](https://github.com/andrewhickman/fs-err/pull/27))
+* Added `set_permissions` ([#28](https://github.com/andrewhickman/fs-err/pull/28))
+
+## 2.3.0
+* Added `create_dir` and `create_dir_all`. ([#19](https://github.com/andrewhickman/fs-err/pull/19))
+* Added `remove_file`, `remove_dir`, and `remove_dir_all`. ([#16](https://github.com/andrewhickman/fs-err/pull/16))
+
+## 2.2.0
+* Added `metadata`. ([#15](https://github.com/andrewhickman/fs-err/pull/15))
+
+## 2.1.0
+* Updated crate-level documentation. ([#8](https://github.com/andrewhickman/fs-err/pull/8))
+* Added `read_dir`, `ReadDir`, and `DirEntry`. ([#9](https://github.com/andrewhickman/fs-err/pull/9))
+
+## 2.0.1 (2020-02-22)
+* Added `copy`. ([#7](https://github.com/andrewhickman/fs-err/pull/7))
+
+## 2.0.0 (2020-02-19)
+* Removed custom error type in favor of `std::io::Error`. ([#2](https://github.com/andrewhickman/fs-err/pull/2))
+
+## 1.0.1 (2020-02-15)
+* Fixed bad documentation link in `Cargo.toml`.
+
+## 1.0.0 (2020-02-15)
+* No changes from 0.1.2.
+
+## 0.1.2 (2020-02-10)
+* Added `Error::cause` implementation for `fs_err::Error`.
+
+## 0.1.1 (2020-02-05)
+* Added wrappers for `std::fs::*` functions.
+
+## 0.1.0 (2020-02-02)
+* Initial release, containing a wrapper around `std::fs::File`.
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..f7a7194
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,59 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2018"
+name = "fs-err"
+version = "2.9.0"
+authors = ["Andrew Hickman <andrew.hickman1@sky.com>"]
+exclude = [
+    ".github",
+    ".gitignore",
+    "README.tpl",
+]
+description = "A drop-in replacement for std::fs with more helpful error messages."
+documentation = "https://docs.rs/fs-err"
+readme = "README.md"
+categories = [
+    "command-line-interface",
+    "filesystem",
+]
+license = "MIT/Apache-2.0"
+repository = "https://github.com/andrewhickman/fs-err"
+
+[package.metadata.release]
+tag-name = "{{version}}"
+sign-tag = true
+
+[[package.metadata.release.pre-release-replacements]]
+file = "src/lib.rs"
+search = 'html_root_url = "https://docs\.rs/fs-err/.*?"'
+replace = "html_root_url = \"https://docs.rs/fs-err/{{version}}\""
+exactly = 1
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = [
+    "--cfg",
+    "docsrs",
+]
+
+[dependencies.tokio]
+version = "1.21"
+features = ["fs"]
+optional = true
+default_features = false
+
+[dev-dependencies.serde_json]
+version = "1.0.64"
+
+[features]
+io_safety = []
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
new file mode 100644
index 0000000..b0627e4
--- /dev/null
+++ b/Cargo.toml.orig
@@ -0,0 +1,36 @@
+[package]
+name = "fs-err"
+description = "A drop-in replacement for std::fs with more helpful error messages."
+version = "2.9.0"
+authors = ["Andrew Hickman <andrew.hickman1@sky.com>"]
+edition = "2018"
+repository = "https://github.com/andrewhickman/fs-err"
+documentation = "https://docs.rs/fs-err"
+categories = ["command-line-interface", "filesystem"]
+license = "MIT/Apache-2.0"
+readme = "README.md"
+exclude = [".github", ".gitignore", "README.tpl"]
+
+[dependencies]
+tokio = { version = "1.21", optional = true, default_features = false, features = ["fs"] }
+
+[dev-dependencies]
+serde_json = "1.0.64"
+
+[features]
+# Adds I/O safety traits introduced in Rust 1.63
+io_safety = []
+
+[package.metadata.release]
+tag-name = "{{version}}"
+sign-tag = true
+
+[[package.metadata.release.pre-release-replacements]]
+file = "src/lib.rs"
+search = "html_root_url = \"https://docs\\.rs/fs-err/.*?\""
+replace = "html_root_url = \"https://docs.rs/fs-err/{{version}}\""
+exactly = 1
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = ["--cfg", "docsrs"]
diff --git a/LICENSE-APACHE b/LICENSE-APACHE
new file mode 100644
index 0000000..f47c941
--- /dev/null
+++ b/LICENSE-APACHE
@@ -0,0 +1,201 @@
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diff --git a/LICENSE-MIT b/LICENSE-MIT
new file mode 100644
index 0000000..458723b
--- /dev/null
+++ b/LICENSE-MIT
@@ -0,0 +1,23 @@
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
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+The above copyright notice and this permission notice
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diff --git a/README.md b/README.md
new file mode 100644
index 0000000..0dc5fc1
--- /dev/null
+++ b/README.md
@@ -0,0 +1,88 @@
+<!--
+	This readme is created with https://github.com/livioribeiro/cargo-readme
+
+	Edit `src/lib.rs` and use `cargo readme > README.md` to update it.
+-->
+
+# fs-err
+
+[![Crates.io](https://img.shields.io/crates/v/fs-err.svg)](https://crates.io/crates/fs-err)
+[![GitHub Actions](https://github.com/andrewhickman/fs-err/workflows/CI/badge.svg)](https://github.com/andrewhickman/fs-err/actions?query=workflow%3ACI)
+
+fs-err is a drop-in replacement for [`std::fs`][std::fs] that provides more
+helpful messages on errors. Extra information includes which operations was
+attempted and any involved paths.
+
+## Error Messages
+
+Using [`std::fs`][std::fs], if this code fails:
+
+```rust
+let file = File::open("does not exist.txt")?;
+```
+
+The error message that Rust gives you isn't very useful:
+
+```txt
+The system cannot find the file specified. (os error 2)
+```
+
+...but if we use fs-err instead, our error contains more actionable information:
+
+```txt
+failed to open file `does not exist.txt`
+    caused by: The system cannot find the file specified. (os error 2)
+```
+
+## Usage
+
+fs-err's API is the same as [`std::fs`][std::fs], so migrating code to use it is easy.
+
+```rust
+// use std::fs;
+use fs_err as fs;
+
+let contents = fs::read_to_string("foo.txt")?;
+
+println!("Read foo.txt: {}", contents);
+
+```
+
+fs-err uses [`std::io::Error`][std::io::Error] for all errors. This helps fs-err
+compose well with traits from the standard library like
+[`std::io::Read`][std::io::Read] and crates that use them like
+[`serde_json`][serde_json]:
+
+```rust
+use fs_err::File;
+
+let file = File::open("my-config.json")?;
+
+// If an I/O error occurs inside serde_json, the error will include a file path
+// as well as what operation was being performed.
+let decoded: Vec<String> = serde_json::from_reader(file)?;
+
+println!("Program config: {:?}", decoded);
+
+```
+
+[std::fs]: https://doc.rust-lang.org/stable/std/fs/
+[std::io::Error]: https://doc.rust-lang.org/stable/std/io/struct.Error.html
+[std::io::Read]: https://doc.rust-lang.org/stable/std/io/trait.Read.html
+[serde_json]: https://crates.io/crates/serde_json
+
+## License
+
+Licensed under either of
+
+* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or https://www.apache.org/licenses/LICENSE-2.0)
+* MIT license ([LICENSE-MIT](LICENSE-MIT) or https://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally
+submitted for inclusion in the work by you, as defined in the Apache-2.0
+license, shall be dual licensed as above, without any additional terms or
+conditions.
diff --git a/src/dir.rs b/src/dir.rs
new file mode 100644
index 0000000..6efa58d
--- /dev/null
+++ b/src/dir.rs
@@ -0,0 +1,90 @@
+use std::ffi::OsString;
+use std::fs;
+use std::io;
+use std::path::PathBuf;
+
+use crate::errors::{Error, ErrorKind};
+
+/// Wrapper for [`fs::read_dir`](https://doc.rust-lang.org/stable/std/fs/fn.read_dir.html).
+pub fn read_dir<P: Into<PathBuf>>(path: P) -> io::Result<ReadDir> {
+    let path = path.into();
+
+    match fs::read_dir(&path) {
+        Ok(inner) => Ok(ReadDir { inner, path }),
+        Err(source) => Err(Error::build(source, ErrorKind::ReadDir, path)),
+    }
+}
+
+/// Wrapper around [`std::fs::ReadDir`][std::fs::ReadDir] which adds more
+/// helpful information to all errors.
+///
+/// This struct is created via [`fs_err::read_dir`][fs_err::read_dir].
+///
+/// [std::fs::ReadDir]: https://doc.rust-lang.org/stable/std/fs/struct.ReadDir.html
+/// [fs_err::read_dir]: fn.read_dir.html
+#[derive(Debug)]
+pub struct ReadDir {
+    inner: fs::ReadDir,
+    path: PathBuf,
+}
+
+impl Iterator for ReadDir {
+    type Item = io::Result<DirEntry>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        Some(
+            self.inner
+                .next()?
+                .map_err(|source| Error::build(source, ErrorKind::ReadDir, &self.path))
+                .map(|inner| DirEntry { inner }),
+        )
+    }
+}
+
+/// Wrapper around [`std::fs::DirEntry`][std::fs::DirEntry] which adds more
+/// helpful information to all errors.
+///
+/// [std::fs::DirEntry]: https://doc.rust-lang.org/stable/std/fs/struct.DirEntry.html
+#[derive(Debug)]
+pub struct DirEntry {
+    inner: fs::DirEntry,
+}
+
+impl DirEntry {
+    /// Wrapper for [`DirEntry::path`](https://doc.rust-lang.org/stable/std/fs/struct.DirEntry.html#method.path).
+    pub fn path(&self) -> PathBuf {
+        self.inner.path()
+    }
+
+    /// Wrapper for [`DirEntry::metadata`](https://doc.rust-lang.org/stable/std/fs/struct.DirEntry.html#method.metadata).
+    pub fn metadata(&self) -> io::Result<fs::Metadata> {
+        self.inner
+            .metadata()
+            .map_err(|source| Error::build(source, ErrorKind::Metadata, self.path()))
+    }
+
+    /// Wrapper for [`DirEntry::file_type`](https://doc.rust-lang.org/stable/std/fs/struct.DirEntry.html#method.file_type).
+    pub fn file_type(&self) -> io::Result<fs::FileType> {
+        self.inner
+            .file_type()
+            .map_err(|source| Error::build(source, ErrorKind::Metadata, self.path()))
+    }
+
+    /// Wrapper for [`DirEntry::file_name`](https://doc.rust-lang.org/stable/std/fs/struct.DirEntry.html#method.file_name).
+    pub fn file_name(&self) -> OsString {
+        self.inner.file_name()
+    }
+}
+
+#[cfg(unix)]
+mod unix {
+    use std::os::unix::fs::DirEntryExt;
+
+    use super::*;
+
+    impl DirEntryExt for DirEntry {
+        fn ino(&self) -> u64 {
+            self.inner.ino()
+        }
+    }
+}
diff --git a/src/errors.rs b/src/errors.rs
new file mode 100644
index 0000000..43bc4ba
--- /dev/null
+++ b/src/errors.rs
@@ -0,0 +1,198 @@
+use std::error::Error as StdError;
+use std::fmt;
+use std::io;
+use std::path::PathBuf;
+
+#[derive(Debug, Clone, Copy)]
+pub(crate) enum ErrorKind {
+    OpenFile,
+    CreateFile,
+    CreateDir,
+    SyncFile,
+    SetLen,
+    Metadata,
+    Clone,
+    SetPermissions,
+    Read,
+    Seek,
+    Write,
+    Flush,
+    ReadDir,
+    RemoveFile,
+    RemoveDir,
+    Canonicalize,
+    ReadLink,
+    SymlinkMetadata,
+
+    #[cfg(windows)]
+    SeekRead,
+    #[cfg(windows)]
+    SeekWrite,
+
+    #[cfg(unix)]
+    ReadAt,
+    #[cfg(unix)]
+    WriteAt,
+}
+
+/// Contains an IO error that has a file path attached.
+///
+/// This type is never returned directly, but is instead wrapped inside yet
+/// another IO error.
+#[derive(Debug)]
+pub(crate) struct Error {
+    kind: ErrorKind,
+    source: io::Error,
+    path: PathBuf,
+}
+
+impl Error {
+    pub fn build(source: io::Error, kind: ErrorKind, path: impl Into<PathBuf>) -> io::Error {
+        io::Error::new(
+            source.kind(),
+            Self {
+                kind,
+                source,
+                path: path.into(),
+            },
+        )
+    }
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        use ErrorKind::*;
+
+        let path = self.path.display();
+
+        match self.kind {
+            OpenFile => write!(formatter, "failed to open file `{}`", path),
+            CreateFile => write!(formatter, "failed to create file `{}`", path),
+            CreateDir => write!(formatter, "failed to create directory `{}`", path),
+            SyncFile => write!(formatter, "failed to sync file `{}`", path),
+            SetLen => write!(formatter, "failed to set length of file `{}`", path),
+            Metadata => write!(formatter, "failed to query metadata of file `{}`", path),
+            Clone => write!(formatter, "failed to clone handle for file `{}`", path),
+            SetPermissions => write!(formatter, "failed to set permissions for file `{}`", path),
+            Read => write!(formatter, "failed to read from file `{}`", path),
+            Seek => write!(formatter, "failed to seek in file `{}`", path),
+            Write => write!(formatter, "failed to write to file `{}`", path),
+            Flush => write!(formatter, "failed to flush file `{}`", path),
+            ReadDir => write!(formatter, "failed to read directory `{}`", path),
+            RemoveFile => write!(formatter, "failed to remove file `{}`", path),
+            RemoveDir => write!(formatter, "failed to remove directory `{}`", path),
+            Canonicalize => write!(formatter, "failed to canonicalize path `{}`", path),
+            ReadLink => write!(formatter, "failed to read symbolic link `{}`", path),
+            SymlinkMetadata => write!(formatter, "failed to query metadata of symlink `{}`", path),
+
+            #[cfg(windows)]
+            SeekRead => write!(formatter, "failed to seek and read from `{}`", path),
+            #[cfg(windows)]
+            SeekWrite => write!(formatter, "failed to seek and write to `{}`", path),
+
+            #[cfg(unix)]
+            ReadAt => write!(formatter, "failed to read with offset from `{}`", path),
+            #[cfg(unix)]
+            WriteAt => write!(formatter, "failed to write with offset to `{}`", path),
+        }
+    }
+}
+
+impl StdError for Error {
+    fn cause(&self) -> Option<&dyn StdError> {
+        self.source()
+    }
+
+    fn source(&self) -> Option<&(dyn StdError + 'static)> {
+        Some(&self.source)
+    }
+}
+
+#[derive(Debug, Clone, Copy)]
+pub(crate) enum SourceDestErrorKind {
+    Copy,
+    HardLink,
+    Rename,
+    SoftLink,
+
+    #[cfg(unix)]
+    Symlink,
+
+    #[cfg(windows)]
+    SymlinkDir,
+    #[cfg(windows)]
+    SymlinkFile,
+}
+
+/// Error type used by functions like `fs::copy` that holds two paths.
+#[derive(Debug)]
+pub(crate) struct SourceDestError {
+    kind: SourceDestErrorKind,
+    source: io::Error,
+    from_path: PathBuf,
+    to_path: PathBuf,
+}
+
+impl SourceDestError {
+    pub fn build(
+        source: io::Error,
+        kind: SourceDestErrorKind,
+        from_path: impl Into<PathBuf>,
+        to_path: impl Into<PathBuf>,
+    ) -> io::Error {
+        io::Error::new(
+            source.kind(),
+            Self {
+                kind,
+                source,
+                from_path: from_path.into(),
+                to_path: to_path.into(),
+            },
+        )
+    }
+}
+
+impl fmt::Display for SourceDestError {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        let from = self.from_path.display();
+        let to = self.to_path.display();
+        match self.kind {
+            SourceDestErrorKind::Copy => {
+                write!(formatter, "failed to copy file from {} to {}", from, to)
+            }
+            SourceDestErrorKind::HardLink => {
+                write!(formatter, "failed to hardlink file from {} to {}", from, to)
+            }
+            SourceDestErrorKind::Rename => {
+                write!(formatter, "failed to rename file from {} to {}", from, to)
+            }
+            SourceDestErrorKind::SoftLink => {
+                write!(formatter, "failed to softlink file from {} to {}", from, to)
+            }
+
+            #[cfg(unix)]
+            SourceDestErrorKind::Symlink => {
+                write!(formatter, "failed to symlink file from {} to {}", from, to)
+            }
+
+            #[cfg(windows)]
+            SourceDestErrorKind::SymlinkFile => {
+                write!(formatter, "failed to symlink file from {} to {}", from, to)
+            }
+            #[cfg(windows)]
+            SourceDestErrorKind::SymlinkDir => {
+                write!(formatter, "failed to symlink dir from {} to {}", from, to)
+            }
+        }
+    }
+}
+
+impl StdError for SourceDestError {
+    fn cause(&self) -> Option<&dyn StdError> {
+        self.source()
+    }
+
+    fn source(&self) -> Option<&(dyn StdError + 'static)> {
+        Some(&self.source)
+    }
+}
diff --git a/src/file.rs b/src/file.rs
new file mode 100644
index 0000000..fcf54fe
--- /dev/null
+++ b/src/file.rs
@@ -0,0 +1,366 @@
+use std::fs;
+use std::io::{self, Read, Seek, Write};
+use std::path::{Path, PathBuf};
+
+use crate::errors::{Error, ErrorKind};
+
+/// Wrapper around [`std::fs::File`][std::fs::File] which adds more helpful
+/// information to all errors.
+///
+/// [std::fs::File]: https://doc.rust-lang.org/stable/std/fs/struct.File.html
+#[derive(Debug)]
+pub struct File {
+    file: fs::File,
+    path: PathBuf,
+}
+
+// Opens a std File and returns it or an error generator which only needs the path to produce the error.
+// Exists for the `crate::read*` functions so they don't unconditionally build a PathBuf.
+pub(crate) fn open(path: &Path) -> Result<std::fs::File, impl FnOnce(PathBuf) -> io::Error> {
+    fs::File::open(&path).map_err(|err| |path| Error::build(err, ErrorKind::OpenFile, path))
+}
+
+// like `open()` but for `crate::write`
+pub(crate) fn create(path: &Path) -> Result<std::fs::File, impl FnOnce(PathBuf) -> io::Error> {
+    fs::File::create(&path).map_err(|err| |path| Error::build(err, ErrorKind::CreateFile, path))
+}
+
+/// Wrappers for methods from [`std::fs::File`][std::fs::File].
+///
+/// [std::fs::File]: https://doc.rust-lang.org/stable/std/fs/struct.File.html
+impl File {
+    /// Wrapper for [`File::open`](https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.open).
+    pub fn open<P>(path: P) -> Result<Self, io::Error>
+    where
+        P: Into<PathBuf>,
+    {
+        let path = path.into();
+        match open(&path) {
+            Ok(file) => Ok(File::from_parts(file, path)),
+            Err(err_gen) => Err(err_gen(path)),
+        }
+    }
+
+    /// Wrapper for [`File::create`](https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.create).
+    pub fn create<P>(path: P) -> Result<Self, io::Error>
+    where
+        P: Into<PathBuf>,
+    {
+        let path = path.into();
+        match create(&path) {
+            Ok(file) => Ok(File::from_parts(file, path)),
+            Err(err_gen) => Err(err_gen(path)),
+        }
+    }
+
+    /// Wrapper for [`OpenOptions::open`](https://doc.rust-lang.org/stable/std/fs/struct.OpenOptions.html#method.open).
+    ///
+    /// This takes [`&std::fs::OpenOptions`](https://doc.rust-lang.org/stable/std/fs/struct.OpenOptions.html),
+    /// not [`crate::OpenOptions`].
+    #[deprecated = "use fs_err::OpenOptions::open instead"]
+    pub fn from_options<P>(path: P, options: &fs::OpenOptions) -> Result<Self, io::Error>
+    where
+        P: Into<PathBuf>,
+    {
+        let path = path.into();
+        match options.open(&path) {
+            Ok(file) => Ok(File::from_parts(file, path)),
+            Err(source) => Err(Error::build(source, ErrorKind::OpenFile, path)),
+        }
+    }
+
+    /// Wrapper for [`File::sync_all`](https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.sync_all).
+    pub fn sync_all(&self) -> Result<(), io::Error> {
+        self.file
+            .sync_all()
+            .map_err(|source| self.error(source, ErrorKind::SyncFile))
+    }
+
+    /// Wrapper for [`File::sync_data`](https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.sync_data).
+    pub fn sync_data(&self) -> Result<(), io::Error> {
+        self.file
+            .sync_data()
+            .map_err(|source| self.error(source, ErrorKind::SyncFile))
+    }
+
+    /// Wrapper for [`File::set_len`](https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.set_len).
+    pub fn set_len(&self, size: u64) -> Result<(), io::Error> {
+        self.file
+            .set_len(size)
+            .map_err(|source| self.error(source, ErrorKind::SetLen))
+    }
+
+    /// Wrapper for [`File::metadata`](https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.metadata).
+    pub fn metadata(&self) -> Result<fs::Metadata, io::Error> {
+        self.file
+            .metadata()
+            .map_err(|source| self.error(source, ErrorKind::Metadata))
+    }
+
+    /// Wrapper for [`File::try_clone`](https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.try_clone).
+    pub fn try_clone(&self) -> Result<Self, io::Error> {
+        self.file
+            .try_clone()
+            .map(|file| File {
+                file,
+                path: self.path.clone(),
+            })
+            .map_err(|source| self.error(source, ErrorKind::Clone))
+    }
+
+    /// Wrapper for [`File::set_permissions`](https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.set_permissions).
+    pub fn set_permissions(&self, perm: fs::Permissions) -> Result<(), io::Error> {
+        self.file
+            .set_permissions(perm)
+            .map_err(|source| self.error(source, ErrorKind::SetPermissions))
+    }
+}
+
+/// Methods added by fs-err that are not available on
+/// [`std::fs::File`][std::fs::File].
+///
+/// [std::fs::File]: https://doc.rust-lang.org/stable/std/fs/struct.File.html
+impl File {
+    /// Creates a [`File`](struct.File.html) from a raw file and its path.
+    pub fn from_parts<P>(file: fs::File, path: P) -> Self
+    where
+        P: Into<PathBuf>,
+    {
+        File {
+            file,
+            path: path.into(),
+        }
+    }
+
+    /// Extract the raw file and its path from this [`File`](struct.File.html)
+    pub fn into_parts(self) -> (fs::File, PathBuf) {
+        (self.file, self.path)
+    }
+
+    /// Returns a reference to the underlying [`std::fs::File`][std::fs::File].
+    ///
+    /// [std::fs::File]: https://doc.rust-lang.org/stable/std/fs/struct.File.html
+    pub fn file(&self) -> &fs::File {
+        &self.file
+    }
+
+    /// Returns a mutable reference to the underlying [`std::fs::File`][std::fs::File].
+    ///
+    /// [std::fs::File]: https://doc.rust-lang.org/stable/std/fs/struct.File.html
+    pub fn file_mut(&mut self) -> &mut fs::File {
+        &mut self.file
+    }
+
+    /// Returns a reference to the path that this file was created with.
+    pub fn path(&self) -> &Path {
+        &self.path
+    }
+
+    /// Wrap the error in information specific to this `File` object.
+    fn error(&self, source: io::Error, kind: ErrorKind) -> io::Error {
+        Error::build(source, kind, &self.path)
+    }
+}
+
+impl Read for File {
+    fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
+        self.file
+            .read(buf)
+            .map_err(|source| self.error(source, ErrorKind::Read))
+    }
+
+    fn read_vectored(&mut self, bufs: &mut [std::io::IoSliceMut<'_>]) -> std::io::Result<usize> {
+        self.file
+            .read_vectored(bufs)
+            .map_err(|source| self.error(source, ErrorKind::Read))
+    }
+}
+
+impl<'a> Read for &'a File {
+    fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
+        (&(**self).file)
+            .read(buf)
+            .map_err(|source| self.error(source, ErrorKind::Read))
+    }
+
+    fn read_vectored(&mut self, bufs: &mut [std::io::IoSliceMut<'_>]) -> std::io::Result<usize> {
+        (&(**self).file)
+            .read_vectored(bufs)
+            .map_err(|source| self.error(source, ErrorKind::Read))
+    }
+}
+
+impl From<File> for fs::File {
+    fn from(file: File) -> Self {
+        file.into_parts().0
+    }
+}
+
+impl Seek for File {
+    fn seek(&mut self, pos: std::io::SeekFrom) -> std::io::Result<u64> {
+        self.file
+            .seek(pos)
+            .map_err(|source| self.error(source, ErrorKind::Seek))
+    }
+}
+
+impl<'a> Seek for &'a File {
+    fn seek(&mut self, pos: std::io::SeekFrom) -> std::io::Result<u64> {
+        (&(**self).file)
+            .seek(pos)
+            .map_err(|source| self.error(source, ErrorKind::Seek))
+    }
+}
+
+impl Write for File {
+    fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
+        self.file
+            .write(buf)
+            .map_err(|source| self.error(source, ErrorKind::Write))
+    }
+
+    fn write_vectored(&mut self, bufs: &[std::io::IoSlice<'_>]) -> std::io::Result<usize> {
+        self.file
+            .write_vectored(bufs)
+            .map_err(|source| self.error(source, ErrorKind::Write))
+    }
+
+    fn flush(&mut self) -> std::io::Result<()> {
+        self.file
+            .flush()
+            .map_err(|source| self.error(source, ErrorKind::Flush))
+    }
+}
+
+impl<'a> Write for &'a File {
+    fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
+        (&(**self).file)
+            .write(buf)
+            .map_err(|source| self.error(source, ErrorKind::Write))
+    }
+
+    fn write_vectored(&mut self, bufs: &[std::io::IoSlice<'_>]) -> std::io::Result<usize> {
+        (&(**self).file)
+            .write_vectored(bufs)
+            .map_err(|source| self.error(source, ErrorKind::Write))
+    }
+
+    fn flush(&mut self) -> std::io::Result<()> {
+        (&(**self).file)
+            .flush()
+            .map_err(|source| self.error(source, ErrorKind::Flush))
+    }
+}
+
+#[cfg(unix)]
+mod unix {
+    use crate::os::unix::fs::FileExt;
+    use crate::ErrorKind;
+    use std::io;
+    use std::os::unix::fs::FileExt as _;
+    use std::os::unix::io::{AsRawFd, IntoRawFd, RawFd};
+
+    impl AsRawFd for crate::File {
+        fn as_raw_fd(&self) -> RawFd {
+            self.file().as_raw_fd()
+        }
+    }
+
+    impl IntoRawFd for crate::File {
+        fn into_raw_fd(self) -> RawFd {
+            self.file.into_raw_fd()
+        }
+    }
+
+    impl FileExt for crate::File {
+        fn read_at(&self, buf: &mut [u8], offset: u64) -> io::Result<usize> {
+            self.file()
+                .read_at(buf, offset)
+                .map_err(|err| self.error(err, ErrorKind::ReadAt))
+        }
+        fn write_at(&self, buf: &[u8], offset: u64) -> io::Result<usize> {
+            self.file()
+                .write_at(buf, offset)
+                .map_err(|err| self.error(err, ErrorKind::WriteAt))
+        }
+    }
+
+    #[cfg(feature = "io_safety")]
+    mod io_safety {
+        use std::os::unix::io::{AsFd, BorrowedFd, OwnedFd};
+
+        #[cfg_attr(docsrs, doc(cfg(feature = "io_safety")))]
+        impl AsFd for crate::File {
+            fn as_fd(&self) -> BorrowedFd<'_> {
+                self.file().as_fd()
+            }
+        }
+
+        #[cfg_attr(docsrs, doc(cfg(feature = "io_safety")))]
+        impl From<crate::File> for OwnedFd {
+            fn from(file: crate::File) -> Self {
+                file.into_parts().0.into()
+            }
+        }
+    }
+}
+
+#[cfg(windows)]
+mod windows {
+    use crate::os::windows::fs::FileExt;
+    use crate::ErrorKind;
+    use std::io;
+    use std::os::windows::{
+        fs::FileExt as _,
+        io::{AsRawHandle, IntoRawHandle, RawHandle},
+    };
+
+    impl FileExt for crate::File {
+        fn seek_read(&self, buf: &mut [u8], offset: u64) -> io::Result<usize> {
+            self.file()
+                .seek_read(buf, offset)
+                .map_err(|err| self.error(err, ErrorKind::SeekRead))
+        }
+
+        fn seek_write(&self, buf: &[u8], offset: u64) -> io::Result<usize> {
+            self.file()
+                .seek_write(buf, offset)
+                .map_err(|err| self.error(err, ErrorKind::SeekWrite))
+        }
+    }
+
+    impl AsRawHandle for crate::File {
+        fn as_raw_handle(&self) -> RawHandle {
+            self.file().as_raw_handle()
+        }
+    }
+
+    // can't be implemented, because the trait doesn't give us a Path
+    // impl std::os::windows::io::FromRawHandle for crate::File {
+    // }
+
+    impl IntoRawHandle for crate::File {
+        fn into_raw_handle(self) -> RawHandle {
+            self.file.into_raw_handle()
+        }
+    }
+
+    #[cfg(feature = "io_safety")]
+    mod io_safety {
+        use std::os::windows::io::{AsHandle, BorrowedHandle, OwnedHandle};
+
+        #[cfg_attr(docsrs, doc(cfg(feature = "io_safety")))]
+        impl AsHandle for crate::File {
+            fn as_handle(&self) -> BorrowedHandle<'_> {
+                self.file().as_handle()
+            }
+        }
+
+        #[cfg_attr(docsrs, doc(cfg(feature = "io_safety")))]
+        impl From<crate::File> for OwnedHandle {
+            fn from(file: crate::File) -> Self {
+                file.into_parts().0.into()
+            }
+        }
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..b1ceae5
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,250 @@
+/*!
+fs-err is a drop-in replacement for [`std::fs`][std::fs] that provides more
+helpful messages on errors. Extra information includes which operations was
+attempted and any involved paths.
+
+# Error Messages
+
+Using [`std::fs`][std::fs], if this code fails:
+
+```no_run
+# use std::fs::File;
+let file = File::open("does not exist.txt")?;
+# Ok::<(), std::io::Error>(())
+```
+
+The error message that Rust gives you isn't very useful:
+
+```txt
+The system cannot find the file specified. (os error 2)
+```
+
+...but if we use fs-err instead, our error contains more actionable information:
+
+```txt
+failed to open file `does not exist.txt`
+    caused by: The system cannot find the file specified. (os error 2)
+```
+
+# Usage
+
+fs-err's API is the same as [`std::fs`][std::fs], so migrating code to use it is easy.
+
+```no_run
+// use std::fs;
+use fs_err as fs;
+
+let contents = fs::read_to_string("foo.txt")?;
+
+println!("Read foo.txt: {}", contents);
+
+# Ok::<(), std::io::Error>(())
+```
+
+fs-err uses [`std::io::Error`][std::io::Error] for all errors. This helps fs-err
+compose well with traits from the standard library like
+[`std::io::Read`][std::io::Read] and crates that use them like
+[`serde_json`][serde_json]:
+
+```no_run
+use fs_err::File;
+
+let file = File::open("my-config.json")?;
+
+// If an I/O error occurs inside serde_json, the error will include a file path
+// as well as what operation was being performed.
+let decoded: Vec<String> = serde_json::from_reader(file)?;
+
+println!("Program config: {:?}", decoded);
+
+# Ok::<(), Box<dyn std::error::Error>>(())
+```
+
+[std::fs]: https://doc.rust-lang.org/stable/std/fs/
+[std::io::Error]: https://doc.rust-lang.org/stable/std/io/struct.Error.html
+[std::io::Read]: https://doc.rust-lang.org/stable/std/io/trait.Read.html
+[serde_json]: https://crates.io/crates/serde_json
+*/
+
+#![doc(html_root_url = "https://docs.rs/fs-err/2.9.0")]
+#![deny(missing_debug_implementations, missing_docs)]
+#![cfg_attr(docsrs, feature(doc_cfg))]
+
+mod dir;
+mod errors;
+mod file;
+mod open_options;
+pub mod os;
+mod path;
+#[cfg(feature = "tokio")]
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub mod tokio;
+
+use std::fs;
+use std::io::{self, Read, Write};
+use std::path::{Path, PathBuf};
+
+use errors::{Error, ErrorKind, SourceDestError, SourceDestErrorKind};
+
+pub use dir::*;
+pub use file::*;
+pub use open_options::OpenOptions;
+pub use path::PathExt;
+
+/// Wrapper for [`fs::read`](https://doc.rust-lang.org/stable/std/fs/fn.read.html).
+pub fn read<P: AsRef<Path>>(path: P) -> io::Result<Vec<u8>> {
+    let path = path.as_ref();
+    let mut file = file::open(path).map_err(|err_gen| err_gen(path.to_path_buf()))?;
+    let mut bytes = Vec::with_capacity(initial_buffer_size(&file));
+    file.read_to_end(&mut bytes)
+        .map_err(|err| Error::build(err, ErrorKind::Read, path))?;
+    Ok(bytes)
+}
+
+/// Wrapper for [`fs::read_to_string`](https://doc.rust-lang.org/stable/std/fs/fn.read_to_string.html).
+pub fn read_to_string<P: AsRef<Path>>(path: P) -> io::Result<String> {
+    let path = path.as_ref();
+    let mut file = file::open(path).map_err(|err_gen| err_gen(path.to_path_buf()))?;
+    let mut string = String::with_capacity(initial_buffer_size(&file));
+    file.read_to_string(&mut string)
+        .map_err(|err| Error::build(err, ErrorKind::Read, path))?;
+    Ok(string)
+}
+
+/// Wrapper for [`fs::write`](https://doc.rust-lang.org/stable/std/fs/fn.write.html).
+pub fn write<P: AsRef<Path>, C: AsRef<[u8]>>(path: P, contents: C) -> io::Result<()> {
+    let path = path.as_ref();
+    file::create(path)
+        .map_err(|err_gen| err_gen(path.to_path_buf()))?
+        .write_all(contents.as_ref())
+        .map_err(|err| Error::build(err, ErrorKind::Write, path))
+}
+
+/// Wrapper for [`fs::copy`](https://doc.rust-lang.org/stable/std/fs/fn.copy.html).
+pub fn copy<P, Q>(from: P, to: Q) -> io::Result<u64>
+where
+    P: AsRef<Path>,
+    Q: AsRef<Path>,
+{
+    let from = from.as_ref();
+    let to = to.as_ref();
+    fs::copy(from, to)
+        .map_err(|source| SourceDestError::build(source, SourceDestErrorKind::Copy, from, to))
+}
+
+/// Wrapper for [`fs::create_dir`](https://doc.rust-lang.org/stable/std/fs/fn.create_dir.html).
+pub fn create_dir<P>(path: P) -> io::Result<()>
+where
+    P: AsRef<Path>,
+{
+    let path = path.as_ref();
+    fs::create_dir(path).map_err(|source| Error::build(source, ErrorKind::CreateDir, path))
+}
+
+/// Wrapper for [`fs::create_dir_all`](https://doc.rust-lang.org/stable/std/fs/fn.create_dir_all.html).
+pub fn create_dir_all<P>(path: P) -> io::Result<()>
+where
+    P: AsRef<Path>,
+{
+    let path = path.as_ref();
+    fs::create_dir_all(path).map_err(|source| Error::build(source, ErrorKind::CreateDir, path))
+}
+
+/// Wrapper for [`fs::remove_dir`](https://doc.rust-lang.org/stable/std/fs/fn.remove_dir.html).
+pub fn remove_dir<P>(path: P) -> io::Result<()>
+where
+    P: AsRef<Path>,
+{
+    let path = path.as_ref();
+    fs::remove_dir(path).map_err(|source| Error::build(source, ErrorKind::RemoveDir, path))
+}
+
+/// Wrapper for [`fs::remove_dir_all`](https://doc.rust-lang.org/stable/std/fs/fn.remove_dir_all.html).
+pub fn remove_dir_all<P>(path: P) -> io::Result<()>
+where
+    P: AsRef<Path>,
+{
+    let path = path.as_ref();
+    fs::remove_dir_all(path).map_err(|source| Error::build(source, ErrorKind::RemoveDir, path))
+}
+
+/// Wrapper for [`fs::remove_file`](https://doc.rust-lang.org/stable/std/fs/fn.remove_file.html).
+pub fn remove_file<P>(path: P) -> io::Result<()>
+where
+    P: AsRef<Path>,
+{
+    let path = path.as_ref();
+    fs::remove_file(path).map_err(|source| Error::build(source, ErrorKind::RemoveFile, path))
+}
+
+/// Wrapper for [`fs::metadata`](https://doc.rust-lang.org/stable/std/fs/fn.metadata.html).
+pub fn metadata<P: AsRef<Path>>(path: P) -> io::Result<fs::Metadata> {
+    let path = path.as_ref();
+    fs::metadata(path).map_err(|source| Error::build(source, ErrorKind::Metadata, path))
+}
+
+/// Wrapper for [`fs::canonicalize`](https://doc.rust-lang.org/stable/std/fs/fn.canonicalize.html).
+pub fn canonicalize<P: AsRef<Path>>(path: P) -> io::Result<PathBuf> {
+    let path = path.as_ref();
+    fs::canonicalize(path).map_err(|source| Error::build(source, ErrorKind::Canonicalize, path))
+}
+
+/// Wrapper for [`fs::hard_link`](https://doc.rust-lang.org/stable/std/fs/fn.hard_link.html).
+pub fn hard_link<P: AsRef<Path>, Q: AsRef<Path>>(src: P, dst: Q) -> io::Result<()> {
+    let src = src.as_ref();
+    let dst = dst.as_ref();
+    fs::hard_link(src, dst)
+        .map_err(|source| SourceDestError::build(source, SourceDestErrorKind::HardLink, src, dst))
+}
+
+/// Wrapper for [`fs::read_link`](https://doc.rust-lang.org/stable/std/fs/fn.read_link.html).
+pub fn read_link<P: AsRef<Path>>(path: P) -> io::Result<PathBuf> {
+    let path = path.as_ref();
+    fs::read_link(path).map_err(|source| Error::build(source, ErrorKind::ReadLink, path))
+}
+
+/// Wrapper for [`fs::rename`](https://doc.rust-lang.org/stable/std/fs/fn.rename.html).
+pub fn rename<P: AsRef<Path>, Q: AsRef<Path>>(from: P, to: Q) -> io::Result<()> {
+    let from = from.as_ref();
+    let to = to.as_ref();
+    fs::rename(from, to)
+        .map_err(|source| SourceDestError::build(source, SourceDestErrorKind::Rename, from, to))
+}
+
+/// Wrapper for [`fs::soft_link`](https://doc.rust-lang.org/stable/std/fs/fn.soft_link.html).
+#[deprecated = "replaced with std::os::unix::fs::symlink and \
+std::os::windows::fs::{symlink_file, symlink_dir}"]
+pub fn soft_link<P: AsRef<Path>, Q: AsRef<Path>>(src: P, dst: Q) -> io::Result<()> {
+    let src = src.as_ref();
+    let dst = dst.as_ref();
+    #[allow(deprecated)]
+    fs::soft_link(src, dst)
+        .map_err(|source| SourceDestError::build(source, SourceDestErrorKind::SoftLink, src, dst))
+}
+
+/// Wrapper for [`fs::symlink_metadata`](https://doc.rust-lang.org/stable/std/fs/fn.symlink_metadata.html).
+pub fn symlink_metadata<P: AsRef<Path>>(path: P) -> io::Result<fs::Metadata> {
+    let path = path.as_ref();
+    fs::symlink_metadata(path)
+        .map_err(|source| Error::build(source, ErrorKind::SymlinkMetadata, path))
+}
+
+/// Wrapper for [`fs::set_permissions`](https://doc.rust-lang.org/stable/std/fs/fn.set_permissions.html).
+pub fn set_permissions<P: AsRef<Path>>(path: P, perm: fs::Permissions) -> io::Result<()> {
+    let path = path.as_ref();
+    fs::set_permissions(path, perm)
+        .map_err(|source| Error::build(source, ErrorKind::SetPermissions, path))
+}
+
+fn initial_buffer_size(file: &std::fs::File) -> usize {
+    file.metadata().map(|m| m.len() as usize + 1).unwrap_or(0)
+}
+
+pub(crate) use private::Sealed;
+mod private {
+    pub trait Sealed {}
+
+    impl Sealed for crate::File {}
+    impl Sealed for std::path::Path {}
+    impl Sealed for crate::OpenOptions {}
+}
diff --git a/src/open_options.rs b/src/open_options.rs
new file mode 100644
index 0000000..557fa7a
--- /dev/null
+++ b/src/open_options.rs
@@ -0,0 +1,134 @@
+use std::{fs, io, path::PathBuf};
+#[derive(Clone, Debug)]
+/// Wrapper around [`std::fs::OptionOptions`](https://doc.rust-lang.org/std/fs/struct.OpenOptions.html)
+pub struct OpenOptions(fs::OpenOptions);
+
+impl OpenOptions {
+    /// Wrapper for [`std::fs::OpenOptions::new`](https://doc.rust-lang.org/std/fs/struct.OpenOptions.html#method.new)
+    #[allow(clippy::new_without_default)]
+    pub fn new() -> Self {
+        OpenOptions(fs::OpenOptions::new())
+    }
+
+    /// Wrapper for [`std::fs::OpenOptions::read`](https://doc.rust-lang.org/std/fs/struct.OpenOptions.html#method.read)
+    pub fn read(&mut self, read: bool) -> &mut Self {
+        self.0.read(read);
+        self
+    }
+
+    /// Wrapper for [`std::fs::OpenOptions::write`](https://doc.rust-lang.org/std/fs/struct.OpenOptions.html#method.write)
+    pub fn write(&mut self, write: bool) -> &mut Self {
+        self.0.write(write);
+        self
+    }
+
+    /// Wrapper for [`std::fs::OpenOptions::append`](https://doc.rust-lang.org/std/fs/struct.OpenOptions.html#method.append)
+    pub fn append(&mut self, append: bool) -> &mut Self {
+        self.0.append(append);
+        self
+    }
+
+    /// Wrapper for [`std::fs::OpenOptions::truncate`](https://doc.rust-lang.org/std/fs/struct.OpenOptions.html#method.truncate)
+    pub fn truncate(&mut self, truncate: bool) -> &mut Self {
+        self.0.truncate(truncate);
+        self
+    }
+
+    /// Wrapper for [`std::fs::OpenOptions::create`](https://doc.rust-lang.org/std/fs/struct.OpenOptions.html#method.create)
+    pub fn create(&mut self, create: bool) -> &mut Self {
+        self.0.create(create);
+        self
+    }
+
+    /// Wrapper for [`std::fs::OpenOptions::create_new`](https://doc.rust-lang.org/std/fs/struct.OpenOptions.html#method.create_new)
+    pub fn create_new(&mut self, create_new: bool) -> &mut Self {
+        self.0.create_new(create_new);
+        self
+    }
+
+    /// Wrapper for [`std::fs::OpenOptions::open`](https://doc.rust-lang.org/std/fs/struct.OpenOptions.html#method.open)
+    pub fn open<P>(&self, path: P) -> io::Result<crate::File>
+    where
+        P: Into<PathBuf>,
+    {
+        // We have to either duplicate the logic or call the deprecated method here.
+        // We can't let the deprecated function call this method, because we can't construct
+        // `&fs_err::OpenOptions` from `&fs::OpenOptions` without cloning
+        // (although cloning would probably be cheap).
+        #[allow(deprecated)]
+        crate::File::from_options(path.into(), self.options())
+    }
+}
+
+/// Methods added by fs-err that are not available on
+/// [`std::fs::OpenOptions`](https://doc.rust-lang.org/stable/std/fs/struct.OpenOptions.html).
+impl OpenOptions {
+    /// Constructs `Self` from [`std::fs::OpenOptions`](https://doc.rust-lang.org/stable/std/fs/struct.OpenOptions.html)
+    pub fn from_options(options: fs::OpenOptions) -> Self {
+        Self(options)
+    }
+
+    /// Returns a reference to the underlying [`std::fs::OpenOptions`](https://doc.rust-lang.org/stable/std/fs/struct.OpenOptions.html).
+    ///
+    /// Note that calling `open()` on this reference will NOT give you the improved errors from fs-err.
+    pub fn options(&self) -> &fs::OpenOptions {
+        &self.0
+    }
+
+    /// Returns a mutable reference to the underlying [`std::fs::OpenOptions`](https://doc.rust-lang.org/stable/std/fs/struct.OpenOptions.html).
+    ///
+    /// This allows you to change settings that don't yet have wrappers in fs-err.
+    /// Note that calling `open()` on this reference will NOT give you the improved errors from fs-err.
+    pub fn options_mut(&mut self) -> &mut fs::OpenOptions {
+        &mut self.0
+    }
+}
+
+#[cfg(unix)]
+mod unix {
+    use crate::os::unix::fs::OpenOptionsExt;
+    use std::os::unix::fs::OpenOptionsExt as _;
+    impl OpenOptionsExt for crate::OpenOptions {
+        fn mode(&mut self, mode: u32) -> &mut Self {
+            self.options_mut().mode(mode);
+            self
+        }
+
+        fn custom_flags(&mut self, flags: i32) -> &mut Self {
+            self.options_mut().custom_flags(flags);
+            self
+        }
+    }
+}
+
+#[cfg(windows)]
+mod windows {
+    use crate::os::windows::fs::OpenOptionsExt;
+    use std::os::windows::fs::OpenOptionsExt as _;
+
+    impl OpenOptionsExt for crate::OpenOptions {
+        fn access_mode(&mut self, access: u32) -> &mut Self {
+            self.options_mut().access_mode(access);
+            self
+        }
+
+        fn share_mode(&mut self, val: u32) -> &mut Self {
+            self.options_mut().share_mode(val);
+            self
+        }
+        fn custom_flags(&mut self, flags: u32) -> &mut Self {
+            self.options_mut().custom_flags(flags);
+            self
+        }
+
+        fn attributes(&mut self, val: u32) -> &mut Self {
+            self.options_mut().attributes(val);
+            self
+        }
+
+        fn security_qos_flags(&mut self, flags: u32) -> &mut Self {
+            self.options_mut().security_qos_flags(flags);
+            self
+        }
+    }
+}
diff --git a/src/os.rs b/src/os.rs
new file mode 100644
index 0000000..b801e60
--- /dev/null
+++ b/src/os.rs
@@ -0,0 +1,11 @@
+//! OS-specific functionality.
+
+// The std-library has a couple more platforms than just `unix` for which these apis
+// are defined, but we're using just `unix` here. We can always expand later.
+#[cfg(unix)]
+/// Platform-specific extensions for Unix platforms.
+pub mod unix;
+
+#[cfg(windows)]
+/// Platform-specific extensions for Windows.
+pub mod windows;
diff --git a/src/os/unix.rs b/src/os/unix.rs
new file mode 100644
index 0000000..ad7c488
--- /dev/null
+++ b/src/os/unix.rs
@@ -0,0 +1,38 @@
+/// Unix-specific extensions to wrappers in `fs_err` for `std::fs` types.
+pub mod fs {
+    use std::io;
+    use std::path::Path;
+
+    use crate::SourceDestError;
+    use crate::SourceDestErrorKind;
+
+    /// Wrapper for [`std::os::unix::fs::symlink`](https://doc.rust-lang.org/std/os/unix/fs/fn.symlink.html)
+    pub fn symlink<P: AsRef<Path>, Q: AsRef<Path>>(src: P, dst: Q) -> io::Result<()> {
+        let src = src.as_ref();
+        let dst = dst.as_ref();
+        std::os::unix::fs::symlink(src, dst)
+            .map_err(|err| SourceDestError::build(err, SourceDestErrorKind::Symlink, src, dst))
+    }
+
+    /// Wrapper for [`std::os::unix::fs::FileExt`](https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html).
+    ///
+    /// The std traits might be extended in the future (See issue [#49961](https://github.com/rust-lang/rust/issues/49961#issuecomment-382751777)).
+    /// This trait is sealed and can not be implemented by other crates.
+    pub trait FileExt: crate::Sealed {
+        /// Wrapper for [`FileExt::read_at`](https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#tymethod.read_at)
+        fn read_at(&self, buf: &mut [u8], offset: u64) -> io::Result<usize>;
+        /// Wrapper for [`FileExt::write_at`](https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#tymethod.write_at)
+        fn write_at(&self, buf: &[u8], offset: u64) -> io::Result<usize>;
+    }
+
+    /// Wrapper for [`std::os::unix::fs::OpenOptionsExt`](https://doc.rust-lang.org/std/os/unix/fs/trait.OpenOptionsExt.html)
+    ///
+    /// The std traits might be extended in the future (See issue [#49961](https://github.com/rust-lang/rust/issues/49961#issuecomment-382751777)).
+    /// This trait is sealed and can not be implemented by other crates.
+    pub trait OpenOptionsExt: crate::Sealed {
+        /// Wrapper for [`OpenOptionsExt::mode`](https://doc.rust-lang.org/std/os/unix/fs/trait.OpenOptionsExt.html#tymethod.mode)
+        fn mode(&mut self, mode: u32) -> &mut Self;
+        /// Wrapper for [`OpenOptionsExt::custom_flags`](https://doc.rust-lang.org/std/os/unix/fs/trait.OpenOptionsExt.html#tymethod.custom_flags)
+        fn custom_flags(&mut self, flags: i32) -> &mut Self;
+    }
+}
diff --git a/src/os/windows.rs b/src/os/windows.rs
new file mode 100644
index 0000000..f559856
--- /dev/null
+++ b/src/os/windows.rs
@@ -0,0 +1,49 @@
+/// Windows-specific extensions to wrappers in `fs_err` for `std::fs` types.
+pub mod fs {
+    use crate::{SourceDestError, SourceDestErrorKind};
+    use std::io;
+    use std::path::Path;
+    /// Wrapper for [std::os::windows::fs::symlink_dir](https://doc.rust-lang.org/std/os/windows/fs/fn.symlink_dir.html)
+    pub fn symlink_dir<P: AsRef<Path>, Q: AsRef<Path>>(src: P, dst: Q) -> io::Result<()> {
+        let src = src.as_ref();
+        let dst = dst.as_ref();
+        std::os::windows::fs::symlink_dir(src, dst)
+            .map_err(|err| SourceDestError::build(err, SourceDestErrorKind::SymlinkDir, src, dst))
+    }
+
+    /// Wrapper for [std::os::windows::fs::symlink_file](https://doc.rust-lang.org/std/os/windows/fs/fn.symlink_file.html)
+    pub fn symlink_file<P: AsRef<Path>, Q: AsRef<Path>>(src: P, dst: Q) -> io::Result<()> {
+        let src = src.as_ref();
+        let dst = dst.as_ref();
+        std::os::windows::fs::symlink_file(src, dst)
+            .map_err(|err| SourceDestError::build(err, SourceDestErrorKind::SymlinkFile, src, dst))
+    }
+
+    /// Wrapper for [`std::os::windows::fs::FileExt`](https://doc.rust-lang.org/std/os/windows/fs/trait.FileExt.html).
+    ///
+    /// The std traits might be extended in the future (See issue [#49961](https://github.com/rust-lang/rust/issues/49961#issuecomment-382751777)).
+    /// This trait is sealed and can not be implemented by other crates.
+    pub trait FileExt: crate::Sealed {
+        /// Wrapper for [`FileExt::seek_read`](https://doc.rust-lang.org/std/os/windows/fs/trait.FileExt.html#tymethod.seek_read)
+        fn seek_read(&self, buf: &mut [u8], offset: u64) -> io::Result<usize>;
+        /// Wrapper for [`FileExt::seek_wriite`](https://doc.rust-lang.org/std/os/windows/fs/trait.FileExt.html#tymethod.seek_write)
+        fn seek_write(&self, buf: &[u8], offset: u64) -> io::Result<usize>;
+    }
+
+    /// Wrapper for [`std::os::windows::fs::OpenOptionsExt`](https://doc.rust-lang.org/std/os/windows/fs/trait.OpenOptionsExt.html)
+    ///
+    /// The std traits might be extended in the future (See issue [#49961](https://github.com/rust-lang/rust/issues/49961#issuecomment-382751777)).
+    /// This trait is sealed and can not be implemented by other crates.
+    pub trait OpenOptionsExt: crate::Sealed {
+        /// Wrapper for [`OpenOptionsExt::access_mode`](https://doc.rust-lang.org/std/os/windows/fs/trait.OpenOptionsExt.html#tymethod.access_mode)
+        fn access_mode(&mut self, access: u32) -> &mut Self;
+        /// Wrapper for [`OpenOptionsExt::share_mode`](https://doc.rust-lang.org/std/os/windows/fs/trait.OpenOptionsExt.html#tymethod.share_mode)
+        fn share_mode(&mut self, val: u32) -> &mut Self;
+        /// Wrapper for [`OpenOptionsExt::custom_flags`](https://doc.rust-lang.org/std/os/windows/fs/trait.OpenOptionsExt.html#tymethod.custom_flags)
+        fn custom_flags(&mut self, flags: u32) -> &mut Self;
+        /// Wrapper for [`OpenOptionsExt::attributes`](https://doc.rust-lang.org/std/os/windows/fs/trait.OpenOptionsExt.html#tymethod.attributes)
+        fn attributes(&mut self, val: u32) -> &mut Self;
+        /// Wrapper for [`OpenOptionsExt::security_qos_flags`](https://doc.rust-lang.org/std/os/windows/fs/trait.OpenOptionsExt.html#tymethod.security_qos_flags)
+        fn security_qos_flags(&mut self, flags: u32) -> &mut Self;
+    }
+}
diff --git a/src/path.rs b/src/path.rs
new file mode 100644
index 0000000..28549a3
--- /dev/null
+++ b/src/path.rs
@@ -0,0 +1,43 @@
+use std::fs;
+use std::io;
+use std::path::{Path, PathBuf};
+
+/// Defines aliases on [`Path`](https://doc.rust-lang.org/std/path/struct.Path.html) for `fs_err` functions.
+///
+/// This trait is sealed and can not be implemented by other crates.
+//
+// Because no one else can implement it, we can add methods backwards-compatibly.
+pub trait PathExt: crate::Sealed {
+    /// Wrapper for [`crate::metadata`].
+    fn fs_err_metadata(&self) -> io::Result<fs::Metadata>;
+    /// Wrapper for [`crate::symlink_metadata`].
+    fn fs_err_symlink_metadata(&self) -> io::Result<fs::Metadata>;
+    /// Wrapper for [`crate::canonicalize`].
+    fn fs_err_canonicalize(&self) -> io::Result<PathBuf>;
+    /// Wrapper for [`crate::read_link`].
+    fn fs_err_read_link(&self) -> io::Result<PathBuf>;
+    /// Wrapper for [`crate::read_dir`].
+    fn fs_err_read_dir(&self) -> io::Result<crate::ReadDir>;
+}
+
+impl PathExt for Path {
+    fn fs_err_metadata(&self) -> io::Result<fs::Metadata> {
+        crate::metadata(self)
+    }
+
+    fn fs_err_symlink_metadata(&self) -> io::Result<fs::Metadata> {
+        crate::symlink_metadata(self)
+    }
+
+    fn fs_err_canonicalize(&self) -> io::Result<PathBuf> {
+        crate::canonicalize(self)
+    }
+
+    fn fs_err_read_link(&self) -> io::Result<PathBuf> {
+        crate::read_link(self)
+    }
+
+    fn fs_err_read_dir(&self) -> io::Result<crate::ReadDir> {
+        crate::read_dir(self)
+    }
+}
diff --git a/src/tokio/dir_builder.rs b/src/tokio/dir_builder.rs
new file mode 100644
index 0000000..0615999
--- /dev/null
+++ b/src/tokio/dir_builder.rs
@@ -0,0 +1,54 @@
+use crate::errors::{Error, ErrorKind};
+use std::io;
+use std::path::Path;
+
+/// A builder for creating directories in various manners.
+///
+/// This is a wrapper around [`tokio::fs::DirBuilder`].
+#[derive(Debug, Default)]
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub struct DirBuilder {
+    inner: tokio::fs::DirBuilder,
+}
+
+impl DirBuilder {
+    /// Creates a new set of options with default mode/security settings for all
+    /// platforms and also non-recursive.
+    ///
+    /// This is a wrapper version of [`tokio::fs::DirBuilder::new`]
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use fs_err::tokio::DirBuilder;
+    ///
+    /// let builder = DirBuilder::new();
+    /// ```
+    pub fn new() -> Self {
+        Default::default()
+    }
+
+    /// Wrapper around [`tokio::fs::DirBuilder::recursive`].
+    pub fn recursive(&mut self, recursive: bool) -> &mut Self {
+        self.inner.recursive(recursive);
+        self
+    }
+
+    /// Wrapper around [`tokio::fs::DirBuilder::create`].
+    pub async fn create(&self, path: impl AsRef<Path>) -> io::Result<()> {
+        let path = path.as_ref();
+        self.inner
+            .create(path)
+            .await
+            .map_err(|err| Error::build(err, ErrorKind::CreateDir, path))
+    }
+}
+
+#[cfg(unix)]
+impl DirBuilder {
+    /// Wrapper around [`tokio::fs::DirBuilder::mode`].
+    pub fn mode(&mut self, mode: u32) -> &mut Self {
+        self.inner.mode(mode);
+        self
+    }
+}
diff --git a/src/tokio/file.rs b/src/tokio/file.rs
new file mode 100644
index 0000000..c0dac4c
--- /dev/null
+++ b/src/tokio/file.rs
@@ -0,0 +1,243 @@
+use crate::errors::{Error, ErrorKind};
+use std::fs::{Metadata, Permissions};
+use std::io;
+use std::io::{IoSlice, SeekFrom};
+use std::path::{Path, PathBuf};
+use std::pin::Pin;
+use std::task::{ready, Context, Poll};
+use tokio::fs;
+use tokio::fs::File as TokioFile;
+use tokio::io::{AsyncRead, AsyncSeek, AsyncWrite, ReadBuf};
+
+/// Wrapper around [`tokio::fs::File`] which adds more helpful
+/// information to all errors.
+#[derive(Debug)]
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub struct File {
+    tokio: fs::File,
+    path: PathBuf,
+}
+
+impl File {
+    /// Wrapper for [`tokio::fs::File::open`].
+    pub async fn open(path: impl Into<PathBuf>) -> io::Result<File> {
+        let path = path.into();
+        let f = TokioFile::open(&path)
+            .await
+            .map_err(|err| Error::build(err, ErrorKind::OpenFile, &path))?;
+        Ok(File::from_parts(f, path))
+    }
+
+    /// Wrapper for [`tokio::fs::File::create`].
+    pub async fn create(path: impl Into<PathBuf>) -> io::Result<File> {
+        let path = path.into();
+        match TokioFile::create(&path).await {
+            Ok(f) => Ok(File::from_parts(f, path)),
+            Err(err) => Err(Error::build(err, ErrorKind::CreateFile, &path)),
+        }
+    }
+
+    /// Wrapper for [`tokio::fs::File::from_std`].
+    pub fn from_std(std: crate::File) -> File {
+        let (std, path) = std.into_parts();
+        File::from_parts(TokioFile::from_std(std), path)
+    }
+
+    /// Wrapper for [`tokio::fs::File::sync_all`].
+    pub async fn sync_all(&self) -> io::Result<()> {
+        self.tokio
+            .sync_all()
+            .await
+            .map_err(|err| self.error(err, ErrorKind::SyncFile))
+    }
+
+    /// Wrapper for [`tokio::fs::File::sync_data`].
+    pub async fn sync_data(&self) -> io::Result<()> {
+        self.tokio
+            .sync_data()
+            .await
+            .map_err(|err| self.error(err, ErrorKind::SyncFile))
+    }
+
+    /// Wrapper for [`tokio::fs::File::set_len`].
+    pub async fn set_len(&self, size: u64) -> io::Result<()> {
+        self.tokio
+            .set_len(size)
+            .await
+            .map_err(|err| self.error(err, ErrorKind::SetLen))
+    }
+
+    /// Wrapper for [`tokio::fs::File::metadata`].
+    pub async fn metadata(&self) -> io::Result<Metadata> {
+        self.tokio
+            .metadata()
+            .await
+            .map_err(|err| self.error(err, ErrorKind::Metadata))
+    }
+
+    /// Wrapper for [`tokio::fs::File::try_clone`].
+    pub async fn try_clone(&self) -> io::Result<File> {
+        match self.tokio.try_clone().await {
+            Ok(file) => Ok(File::from_parts(file, self.path.clone())),
+            Err(err) => Err(self.error(err, ErrorKind::Clone)),
+        }
+    }
+
+    /// Wrapper for [`tokio::fs::File::into_std`].
+    pub async fn into_std(self) -> crate::File {
+        crate::File::from_parts(self.tokio.into_std().await, self.path)
+    }
+
+    /// Wrapper for [`tokio::fs::File::try_into_std`].
+    pub fn try_into_std(self) -> Result<crate::File, File> {
+        match self.tokio.try_into_std() {
+            Ok(f) => Ok(crate::File::from_parts(f, self.path)),
+            Err(f) => Err(File::from_parts(f, self.path)),
+        }
+    }
+
+    /// Wrapper for [`tokio::fs::File::set_permissions`].
+    pub async fn set_permissions(&self, perm: Permissions) -> io::Result<()> {
+        self.tokio
+            .set_permissions(perm)
+            .await
+            .map_err(|err| self.error(err, ErrorKind::SetPermissions))
+    }
+}
+
+/// Methods added by fs-err that are not available on
+/// [`tokio::fs::File`].
+impl File {
+    /// Creates a [`File`](struct.File.html) from a raw file and its path.
+    pub fn from_parts<P>(file: TokioFile, path: P) -> Self
+    where
+        P: Into<PathBuf>,
+    {
+        File {
+            tokio: file,
+            path: path.into(),
+        }
+    }
+
+    /// Extract the raw file and its path from this [`File`](struct.File.html).
+    pub fn into_parts(self) -> (TokioFile, PathBuf) {
+        (self.tokio, self.path)
+    }
+
+    /// Returns a reference to the underlying [`tokio::fs::File`].
+    pub fn file(&self) -> &TokioFile {
+        &self.tokio
+    }
+
+    /// Returns a mutable reference to the underlying [`tokio::fs::File`].
+    pub fn file_mut(&mut self) -> &mut TokioFile {
+        &mut self.tokio
+    }
+
+    /// Returns a reference to the path that this file was created with.
+    pub fn path(&self) -> &Path {
+        &self.path
+    }
+
+    /// Wrap the error in information specific to this `File` object.
+    fn error(&self, source: io::Error, kind: ErrorKind) -> io::Error {
+        Error::build(source, kind, &self.path)
+    }
+}
+
+impl From<crate::File> for File {
+    fn from(f: crate::File) -> Self {
+        let (f, path) = f.into_parts();
+        File::from_parts(f.into(), path)
+    }
+}
+
+impl From<File> for TokioFile {
+    fn from(f: File) -> Self {
+        f.into_parts().0
+    }
+}
+
+#[cfg(unix)]
+impl std::os::unix::io::AsRawFd for File {
+    fn as_raw_fd(&self) -> std::os::unix::io::RawFd {
+        self.tokio.as_raw_fd()
+    }
+}
+
+#[cfg(windows)]
+impl std::os::windows::io::AsRawHandle for File {
+    fn as_raw_handle(&self) -> std::os::windows::io::RawHandle {
+        self.tokio.as_raw_handle()
+    }
+}
+
+impl AsyncRead for File {
+    fn poll_read(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &mut ReadBuf<'_>,
+    ) -> Poll<io::Result<()>> {
+        Poll::Ready(
+            ready!(Pin::new(&mut self.tokio).poll_read(cx, buf))
+                .map_err(|err| self.error(err, ErrorKind::Read)),
+        )
+    }
+}
+
+impl AsyncSeek for File {
+    fn start_seek(mut self: Pin<&mut Self>, position: SeekFrom) -> io::Result<()> {
+        Pin::new(&mut self.tokio)
+            .start_seek(position)
+            .map_err(|err| self.error(err, ErrorKind::Seek))
+    }
+
+    fn poll_complete(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<u64>> {
+        Poll::Ready(
+            ready!(Pin::new(&mut self.tokio).poll_complete(cx))
+                .map_err(|err| self.error(err, ErrorKind::Seek)),
+        )
+    }
+}
+
+impl AsyncWrite for File {
+    fn poll_write(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &[u8],
+    ) -> Poll<io::Result<usize>> {
+        Poll::Ready(
+            ready!(Pin::new(&mut self.tokio).poll_write(cx, buf))
+                .map_err(|err| self.error(err, ErrorKind::Write)),
+        )
+    }
+
+    fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
+        Poll::Ready(
+            ready!(Pin::new(&mut self.tokio).poll_flush(cx))
+                .map_err(|err| self.error(err, ErrorKind::Flush)),
+        )
+    }
+
+    fn poll_shutdown(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
+        Poll::Ready(
+            ready!(Pin::new(&mut self.tokio).poll_shutdown(cx))
+                .map_err(|err| self.error(err, ErrorKind::Flush)),
+        )
+    }
+
+    fn poll_write_vectored(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        bufs: &[IoSlice<'_>],
+    ) -> Poll<io::Result<usize>> {
+        Poll::Ready(
+            ready!(Pin::new(&mut self.tokio).poll_write_vectored(cx, bufs))
+                .map_err(|err| self.error(err, ErrorKind::Write)),
+        )
+    }
+
+    fn is_write_vectored(&self) -> bool {
+        self.tokio.is_write_vectored()
+    }
+}
diff --git a/src/tokio/mod.rs b/src/tokio/mod.rs
new file mode 100644
index 0000000..bf4ac94
--- /dev/null
+++ b/src/tokio/mod.rs
@@ -0,0 +1,189 @@
+//! Tokio-specific wrappers that use `fs_err` error messages.
+
+use crate::errors::{Error, ErrorKind, SourceDestError, SourceDestErrorKind};
+use std::fs::{Metadata, Permissions};
+use std::path::{Path, PathBuf};
+use tokio::io;
+mod dir_builder;
+mod file;
+mod open_options;
+mod read_dir;
+
+pub use self::open_options::OpenOptions;
+pub use self::read_dir::{read_dir, DirEntry, ReadDir};
+pub use dir_builder::DirBuilder;
+pub use file::File;
+
+/// Wrapper for [`tokio::fs::canonicalize`].
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub async fn canonicalize(path: impl AsRef<Path>) -> io::Result<PathBuf> {
+    let path = path.as_ref();
+    tokio::fs::canonicalize(path)
+        .await
+        .map_err(|err| Error::build(err, ErrorKind::Canonicalize, path))
+}
+
+/// Wrapper for [`tokio::fs::copy`].
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub async fn copy(from: impl AsRef<Path>, to: impl AsRef<Path>) -> Result<u64, io::Error> {
+    let (from, to) = (from.as_ref(), to.as_ref());
+    tokio::fs::copy(from, to)
+        .await
+        .map_err(|err| SourceDestError::build(err, SourceDestErrorKind::Copy, from, to))
+}
+
+/// Wrapper for [`tokio::fs::create_dir`].
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub async fn create_dir(path: impl AsRef<Path>) -> io::Result<()> {
+    let path = path.as_ref();
+    tokio::fs::create_dir(path)
+        .await
+        .map_err(|err| Error::build(err, ErrorKind::CreateDir, path))
+}
+
+/// Wrapper for [`tokio::fs::create_dir_all`].
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub async fn create_dir_all(path: impl AsRef<Path>) -> io::Result<()> {
+    let path = path.as_ref();
+    tokio::fs::create_dir_all(path)
+        .await
+        .map_err(|err| Error::build(err, ErrorKind::CreateDir, path))
+}
+
+/// Wrapper for [`tokio::fs::hard_link`].
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub async fn hard_link(src: impl AsRef<Path>, dst: impl AsRef<Path>) -> io::Result<()> {
+    let (src, dst) = (src.as_ref(), dst.as_ref());
+    tokio::fs::hard_link(src, dst)
+        .await
+        .map_err(|err| SourceDestError::build(err, SourceDestErrorKind::HardLink, src, dst))
+}
+
+/// Wrapper for [`tokio::fs::metadata`].
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub async fn metadata(path: impl AsRef<Path>) -> io::Result<Metadata> {
+    let path = path.as_ref();
+    tokio::fs::metadata(path)
+        .await
+        .map_err(|err| Error::build(err, ErrorKind::Metadata, path))
+}
+
+/// Wrapper for [`tokio::fs::read`].
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub async fn read(path: impl AsRef<Path>) -> io::Result<Vec<u8>> {
+    let path = path.as_ref();
+    tokio::fs::read(path)
+        .await
+        .map_err(|err| Error::build(err, ErrorKind::Read, path))
+}
+
+/// Wrapper for [`tokio::fs::read_link`].
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub async fn read_link(path: impl AsRef<Path>) -> io::Result<PathBuf> {
+    let path = path.as_ref();
+    tokio::fs::read_link(path)
+        .await
+        .map_err(|err| Error::build(err, ErrorKind::ReadLink, path))
+}
+
+/// Wrapper for [`tokio::fs::read_to_string`].
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub async fn read_to_string(path: impl AsRef<Path>) -> io::Result<String> {
+    let path = path.as_ref();
+    tokio::fs::read_to_string(path)
+        .await
+        .map_err(|err| Error::build(err, ErrorKind::Read, path))
+}
+
+/// Wrapper for [`tokio::fs::remove_dir`].
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub async fn remove_dir(path: impl AsRef<Path>) -> io::Result<()> {
+    let path = path.as_ref();
+    tokio::fs::remove_dir(path)
+        .await
+        .map_err(|err| Error::build(err, ErrorKind::RemoveDir, path))
+}
+
+/// Wrapper for [`tokio::fs::remove_dir_all`].
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub async fn remove_dir_all(path: impl AsRef<Path>) -> io::Result<()> {
+    let path = path.as_ref();
+    tokio::fs::remove_dir_all(path)
+        .await
+        .map_err(|err| Error::build(err, ErrorKind::RemoveDir, path))
+}
+
+/// Wrapper for [`tokio::fs::remove_file`].
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub async fn remove_file(path: impl AsRef<Path>) -> io::Result<()> {
+    let path = path.as_ref();
+    tokio::fs::remove_file(path)
+        .await
+        .map_err(|err| Error::build(err, ErrorKind::RemoveFile, path))
+}
+
+/// Wrapper for [`tokio::fs::rename`].
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub async fn rename(from: impl AsRef<Path>, to: impl AsRef<Path>) -> io::Result<()> {
+    let (from, to) = (from.as_ref(), to.as_ref());
+    tokio::fs::rename(from, to)
+        .await
+        .map_err(|err| SourceDestError::build(err, SourceDestErrorKind::Rename, from, to))
+}
+
+/// Wrapper for [`tokio::fs::set_permissions`].
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub async fn set_permissions(path: impl AsRef<Path>, perm: Permissions) -> io::Result<()> {
+    let path = path.as_ref();
+    tokio::fs::set_permissions(path, perm)
+        .await
+        .map_err(|err| Error::build(err, ErrorKind::SetPermissions, path))
+}
+
+/// Wrapper for [`tokio::fs::symlink_metadata`].
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub async fn symlink_metadata(path: impl AsRef<Path>) -> io::Result<Metadata> {
+    let path = path.as_ref();
+    tokio::fs::symlink_metadata(path)
+        .await
+        .map_err(|err| Error::build(err, ErrorKind::SymlinkMetadata, path))
+}
+
+/// Wrapper for [`tokio::fs::symlink`].
+#[cfg(unix)]
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub async fn symlink(src: impl AsRef<Path>, dst: impl AsRef<Path>) -> io::Result<()> {
+    let (src, dst) = (src.as_ref(), dst.as_ref());
+    tokio::fs::symlink(src, dst)
+        .await
+        .map_err(|err| SourceDestError::build(err, SourceDestErrorKind::Symlink, src, dst))
+}
+
+/// Wrapper for [`tokio::fs::symlink_dir`].
+#[cfg(windows)]
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub async fn symlink(src: impl AsRef<Path>, dst: impl AsRef<Path>) -> io::Result<()> {
+    let (src, dst) = (src.as_ref(), dst.as_ref());
+    tokio::fs::symlink_dir(src, dst)
+        .await
+        .map_err(|err| SourceDestError::build(err, SourceDestErrorKind::SymlinkDir, src, dst))
+}
+
+/// Wrapper for [`tokio::fs::symlink_file`].
+#[cfg(windows)]
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub async fn symlink_file(src: impl AsRef<Path>, dst: impl AsRef<Path>) -> io::Result<()> {
+    let (src, dst) = (src.as_ref(), dst.as_ref());
+    tokio::fs::symlink_file(src, dst)
+        .await
+        .map_err(|err| SourceDestError::build(err, SourceDestErrorKind::SymlinkFile, src, dst))
+}
+
+/// Wrapper for [`tokio::fs::write`].
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub async fn write(path: impl AsRef<Path>, contents: impl AsRef<[u8]>) -> io::Result<()> {
+    let (path, contents) = (path.as_ref(), contents.as_ref());
+    tokio::fs::write(path, contents)
+        .await
+        .map_err(|err| Error::build(err, ErrorKind::Write, path))
+}
diff --git a/src/tokio/open_options.rs b/src/tokio/open_options.rs
new file mode 100644
index 0000000..6a2b5bf
--- /dev/null
+++ b/src/tokio/open_options.rs
@@ -0,0 +1,109 @@
+use crate::errors::{Error, ErrorKind};
+use crate::tokio::File;
+use std::io;
+use std::path::Path;
+use tokio::fs::OpenOptions as TokioOpenOptions;
+
+/// Options and flags which can be used to configure how a file is opened.
+///
+/// This is a wrapper around [`tokio::fs::OpenOptions`].
+#[derive(Clone, Debug, Default)]
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub struct OpenOptions {
+    tokio: TokioOpenOptions,
+}
+
+impl OpenOptions {
+    /// Creates a blank new set of options ready for configuration.
+    ///
+    /// All options are initially set to `false`.
+    ///
+    /// This is a wrapped version of [`tokio::fs::OpenOptions::new`]
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use fs_err::tokio::OpenOptions;
+    ///
+    /// let mut options = OpenOptions::new();
+    /// let future = options.read(true).open("foo.txt");
+    /// ```
+    pub fn new() -> OpenOptions {
+        OpenOptions {
+            tokio: TokioOpenOptions::new(),
+        }
+    }
+
+    /// Wrapper for [`tokio::fs::OpenOptions::read`].
+    pub fn read(&mut self, read: bool) -> &mut OpenOptions {
+        self.tokio.read(read);
+        self
+    }
+
+    /// Wrapper for [`tokio::fs::OpenOptions::write`].
+    pub fn write(&mut self, write: bool) -> &mut OpenOptions {
+        self.tokio.write(write);
+        self
+    }
+
+    /// Wrapper for [`tokio::fs::OpenOptions::append`].
+    pub fn append(&mut self, append: bool) -> &mut OpenOptions {
+        self.tokio.append(append);
+        self
+    }
+
+    /// Wrapper for [`tokio::fs::OpenOptions::truncate`].
+    pub fn truncate(&mut self, truncate: bool) -> &mut OpenOptions {
+        self.tokio.truncate(truncate);
+        self
+    }
+
+    /// Wrapper for [`tokio::fs::OpenOptions::create`].
+    pub fn create(&mut self, create: bool) -> &mut OpenOptions {
+        self.tokio.create(create);
+        self
+    }
+
+    /// Wrapper for [`tokio::fs::OpenOptions::create_new`].
+    pub fn create_new(&mut self, create_new: bool) -> &mut OpenOptions {
+        self.tokio.create_new(create_new);
+        self
+    }
+
+    /// Wrapper for [`tokio::fs::OpenOptions::open`].
+    pub async fn open(&self, path: impl AsRef<Path>) -> io::Result<File> {
+        let path = path.as_ref();
+        self.tokio
+            .open(path)
+            .await
+            .map(|f| File::from_parts(f, path))
+            .map_err(|err| Error::build(err, ErrorKind::OpenFile, path))
+    }
+}
+
+#[cfg(unix)]
+impl OpenOptions {
+    /// Wrapper for [`tokio::fs::OpenOptions::mode`].
+    pub fn mode(&mut self, mode: u32) -> &mut OpenOptions {
+        self.tokio.mode(mode);
+        self
+    }
+
+    /// Wrapper for [`tokio::fs::OpenOptions::custom_flags`].
+    pub fn custom_flags(&mut self, flags: i32) -> &mut OpenOptions {
+        self.tokio.custom_flags(flags);
+        self
+    }
+}
+
+impl From<std::fs::OpenOptions> for OpenOptions {
+    fn from(std: std::fs::OpenOptions) -> Self {
+        OpenOptions { tokio: std.into() }
+    }
+}
+
+impl From<TokioOpenOptions> for OpenOptions {
+    fn from(tokio: TokioOpenOptions) -> Self {
+        OpenOptions { tokio }
+    }
+}
diff --git a/src/tokio/read_dir.rs b/src/tokio/read_dir.rs
new file mode 100644
index 0000000..2594edf
--- /dev/null
+++ b/src/tokio/read_dir.rs
@@ -0,0 +1,94 @@
+use crate::errors::{Error, ErrorKind};
+use std::ffi::OsString;
+use std::fs::{FileType, Metadata};
+use std::io;
+use std::path::{Path, PathBuf};
+use std::task::{ready, Context, Poll};
+use tokio::fs;
+
+/// Wrapper for [`tokio::fs::read_dir`].
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub async fn read_dir(path: impl AsRef<Path>) -> io::Result<ReadDir> {
+    let path = path.as_ref();
+    let tokio = fs::read_dir(path)
+        .await
+        .map_err(|err| Error::build(err, ErrorKind::ReadDir, path))?;
+    Ok(ReadDir {
+        tokio,
+        path: path.to_owned(),
+    })
+}
+
+/// Reads the entries in a directory.
+///
+/// This is a wrapper around [`tokio::fs::ReadDir`].
+#[derive(Debug)]
+#[must_use = "streams do nothing unless polled"]
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub struct ReadDir {
+    tokio: fs::ReadDir,
+    path: PathBuf,
+}
+
+impl ReadDir {
+    /// Wrapper around [`tokio::fs::ReadDir::next_entry`].
+    pub async fn next_entry(&mut self) -> io::Result<Option<DirEntry>> {
+        match self.tokio.next_entry().await {
+            Ok(entry) => Ok(entry.map(|e| DirEntry { tokio: e })),
+            Err(err) => Err(Error::build(err, ErrorKind::ReadDir, &self.path)),
+        }
+    }
+
+    /// Wrapper around [`tokio::fs::ReadDir::poll_next_entry`].
+    pub fn poll_next_entry(&mut self, cx: &mut Context<'_>) -> Poll<io::Result<Option<DirEntry>>> {
+        Poll::Ready(match ready!(self.tokio.poll_next_entry(cx)) {
+            Ok(entry) => Ok(entry.map(|e| DirEntry { tokio: e })),
+            Err(err) => Err(Error::build(err, ErrorKind::ReadDir, &self.path)),
+        })
+    }
+}
+
+/// Entries returned by the [`ReadDir`] stream.
+///
+/// This is a wrapper around [`tokio::fs::DirEntry`].
+#[derive(Debug)]
+#[cfg_attr(docsrs, doc(cfg(feature = "tokio")))]
+pub struct DirEntry {
+    tokio: fs::DirEntry,
+}
+
+impl DirEntry {
+    /// Wrapper around [`tokio::fs::DirEntry::path`].
+    pub fn path(&self) -> PathBuf {
+        self.tokio.path()
+    }
+
+    /// Wrapper around [`tokio::fs::DirEntry::file_name`].
+    pub fn file_name(&self) -> OsString {
+        self.tokio.file_name()
+    }
+
+    /// Wrapper around [`tokio::fs::DirEntry::metadata`].
+    pub async fn metadata(&self) -> io::Result<Metadata> {
+        self.tokio
+            .metadata()
+            .await
+            .map_err(|err| Error::build(err, ErrorKind::Metadata, self.path()))
+    }
+
+    /// Wrapper around [`tokio::fs::DirEntry::file_type`].
+    pub async fn file_type(&self) -> io::Result<FileType> {
+        self.tokio
+            .file_type()
+            .await
+            .map_err(|err| Error::build(err, ErrorKind::Metadata, self.path()))
+    }
+}
+
+#[cfg(unix)]
+impl DirEntry {
+    /// Wrapper around [`tokio::fs::DirEntry::ino`].
+    pub fn ino(&self) -> u64 {
+        self.tokio.ino()
+    }
+}