Method onEvictable

fdbserver/VersionedBTree.actor.cpp:2128–2128

Entry is evictable when its write and read futures are ready, even if they are errors, so any buffers they hold are no longer needed by the underlying file actors

		// Entry is evictable when its write and read futures are ready, even if they are
		// errors, so any buffers they hold are no longer needed by the underlying file actors
		Future<Void> onEvictable() const { return ready(readFuture) && ready(writeFuture); }

		// Read and write futures are safe to cancel so just cancel them and return
		Future<Void> cancel() {