EXT4 Has A Nice One-Line Performance Fix For Cases When Delayed Allocation Is Disabled

When an EXT4 file-system is running low on free space (or when toggled via the "nodelalloc" mount option), EXT4's delayed allocation mode can be disabled. This can result in a significant performance hit but now a patch is pending for what should land in Linux 5.20 with recovering that performance when delayed allocation is disabled...