K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2013-09-29T18:02:23.997660Z
K 7
svn:log
V 338
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)

END