Delayed allocation was adequately supported. Implementing it in ext4 increased the risk of zeroing out a file from “having all files updated in the past 20ms b

Delayed allocation was adequately supported. Implementing it in ext4 increased the risk of zeroing out a file from “having all files updated in the past 20ms be zeroed out” to “having all files updated in the past 4 seconds be zeroed out” in the event of a system crash.