Method fallocate

crates/commitlog/src/segment.rs:245–250

(&mut self, size: u64)

    #[cfg(all(feature = "fallocate", target_os = "linux"))]
    fn fallocate(&mut self, size: u64) -> io::Result<()> {
        use nix::fcntl::{fallocate, FallocateFlags};

        fallocate(self, FallocateFlags::FALLOC_FL_KEEP_SIZE, 0, size as _)?;
        Ok(())
    }

    // Fail compilation if `fallocate` is enabled but not supported.
    #[cfg(all(feature = "fallocate", not(target_os = "linux"), not(any(test, feature = "test"))))]