Sorry for being dense, but I don't see why an 8 kB block would
need to occupy 2 contiguous pages in ram.
The page cache is indexed in pages, it should be easy enough to
do the disk IO on the 8 kB on-disk block as 2 4 kB IOs, each to
a different page in RAM.
-- "Linux holds advantages over the single-vendor commercial OS" -- Microsoft's "Competing with Linux" document
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