Cargo Features

[dependencies]
efs = { version = "0.4.1", default-features = false, features = ["std", "ext2"] }
default = ext2

The ext2 feature is set by default whenever efs is added without default-features = false somewhere in the dependency tree.

std

Enables std of once_cell

once_cell:

Enables once_cell::sync module.

Affects dev::default_now, io::StdIOWrapper

ext2 default

Affects fs::ext2