K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2015-12-22T20:37:34.375532Z
K 7
svn:log
V 537
Make it possible for the cdevsw d_close() driver method to detect last
close and close due to revoke(2)-like operation.

A new FLASTCLOSE flag indicates that this is last close.  FREVOKE is
set for revokes, and FNONBLOCK is also set, same as is already done
for VOP_CLOSE() call from vgonel().

The flags reuse user open(2) flags which are never stored in f_flag,
to not consume bit space in the ABI visible way.  Assert this with the
static check.

Requested and reviewed by:	bde
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks

END