fs4
v1.1.0 StableNo libc, pure Rust cross-platform file locks. Original fs2, now supports async and replace libc by rustix.
Quick Verdict
- ✓Actively maintained (updated 76d ago)
- ✓Stable API (1.x for 4+ years)
- ✓Massive adoption (3.5K crates depend on it)
- ✓Permissive license (MIT OR Apache-2.0)
Security
Deep Insights
5.6M downloads in the last 30 days (188.3K/day), up 12% from the previous period.
3.5K crates depend on fs4. Strong ecosystem adoption means battle-tested code and long-term stability.
The primary maintainer publishes 150 crates. This suggests deep Rust expertise and long-term commitment to the ecosystem.
The API has been stable (1.x) for over 4 years with 32 releases. This level of maturity means you can depend on it without worrying about breaking changes.
At 44KB, fs4 is lightweight. Small crate size correlates with focused, well-scoped functionality.
13% of releases have been yanked. Check version history before pinning.
Notable dependents include vsdbsled, tantivy, polars-io, foyer-storage, binary-install. When high-quality crates choose fs4, it's a strong quality signal.
Health Breakdown
Recency, release consistency, active ratio
Yanked ratio, deps, size, maturity, features
Reverse deps, ownership, ecosystem
Downloads, momentum, growth trend
Docs, repo, license, metadata
Download Trend
Top Dependents
Version Adoption
Release Timeline
Feature Flags
default =["sync"]