BTW many years ago I persuaded the original developer of ext to not implement in it the demented BSD FFS idea of large block/small fragment, arguing that adaptive read-ahead and write-behind would give better dynamic performance, and adaptive allocate-ahead (reservations) better contiguity, without the downsides.
Not everything got implemented as I suggested, but at least all the absurd complications of large block/small fragment (for example the page mapping issues) were avoided in Linux, as well as the implied fixed ra/wb/aa.
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