Enum AsyncStart 

pub(crate) enum AsyncStart {
    Reply(Status, Vec<u8>),
    Pending(u64),
}

Block until a conflicting byte-range lock is released and the requested ranges can be acquired, then emit the final LOCK response ([MS-SMB2] §3.3.5.14). Cancellation yields STATUS_CANCELLED. How an async-capable command (LOCK / CHANGE_NOTIFY) starts: either an immediate reply, or a deferral parked under an async id whose final reply a background worker sends later ([MS-SMB2] §3.3.4.2).

Variants

Reply(Status, Vec<u8>)

Pending(u64)