Richard Scheffenegger f4b4526f23 Add O_DIRECT flag to DD for cache bypass
FreeBSD DD utility has not had support for the O_DIRECT flag, which
is useful to bypass local caching, e.g. for unconditionally issuing
NFS IO requests during testing.

Reviewed by:	rgrimes (mentor)
Approved by:	rgrimes (mentor, blanket)
MFC after:	3 weeks
Sponsored by:	NetApp, Inc.
Differential Revision:	https://reviews.freebsd.org/D25066
2020-06-04 20:47:11 +00:00
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