Konstantin Belousov 7c6fe80353 Add LK_TRYUPGRADE operation for lockmgr(9), which attempts to
atomically upgrade shared lock to exclusive.  On failure, error is
returned and lock is not dropped in the process.

Tested by:      pho (previous version)
No objections from:     attilio
Sponsored by:   The FreeBSD Foundation
MFC after:      1 week
Approved by:	re (glebius)
2013-09-29 18:02:23 +00:00
..
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