kib 19618f8455 Add V_VMIO flag for vinvalbuf(9) to indicate that the flush request
was issued during VM-initiated i/o (pageout), so that the function
does not try to flush or remove pages or wait for the vm object
paging-in-progress counter.

Reviewed by:	markj
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
X-Differential revision:	https://reviews.freebsd.org/D10241
2017-04-05 16:57:53 +00:00
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