While a write is occurring on the cache side, if the ls is executed on the origin, it will reclaim the delegation from the cache, causing it to wait until the write-back is complete. At that time, eve...While a write is occurring on the cache side, if the ls is executed on the origin, it will reclaim the delegation from the cache, causing it to wait until the write-back is complete. At that time, even if another ls is executed on the cache side, the delegation is in the process of being reclaimed on the origin side, and since the ls command has not yet been executed on the origin, the cache side has no choice but to wait.