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Subjectopen(.. O_DIRECT ..) difference in between Linux and FreeBSD ..
I have been debugging long and hard a thing where IO is done
with O_DIRECT flag applied to open(2).

Unlike Linux, FreeBSD (where this flag originates, apparently) does
_not_ require that read()/write() happens from page aligned memory
areas, and/or be of page-size multiples in size.

This needs at least wording in open(2) man-page, possibly code
changes in the kernel to support alike behaviour.

/Matti Aarnio
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