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Extended utilities for working with files and filesystems in Rust.

This is a fork of thefs2-rs crate, the aim for this fork is to supportasyncand replacelibc byrustix.

• std

  [dependencies]fs4 = {version ="0.13",features = ["sync"] }

• async-std runtime

  [dependencies]fs4 = {version ="0.13",features = ["async-std"] }

• fs-err v2

  [dependencies]fs4 = {version ="0.13",features = ["fs-err2"] }

• fs-err-tokio v2

  [dependencies]fs4 = {version ="0.13",features = ["fs-err2-tokio"] }

• fs-err v3

  [dependencies]fs4 = {version ="0.13",features = ["fs-err3"] }

• fs-err-tokio v3

  [dependencies]fs4 = {version ="0.13",features = ["fs-err3-tokio"] }

• smol runtime

  [dependencies]fs4 = {version ="0.13",features = ["smol"] }

• tokio runtime

  [dependencies]fs4 = {version ="0.13",features = ["tokio"] }

• file locks.
• file (pre)allocation.
• file allocation information.
• filesystem space usage information.
• async-std support
• fs-err
• smol support
• tokio support

fs4 is primarily distributed under the terms of both the MIT license and theApache License (Version 2.0).

SeeLICENSE-APACHE,LICENSE-MIT for details.

Copyright (c) 2025 Al Liu.

Copyright (c) 2015 Dan Burkert.