K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2009-08-14T10:59:17.807657Z
K 7
svn:log
V 421
In nfs_upgrade_vnlock(), assert that the vnode is locked. It is for all
pathes, as far as I see and testing seems to confirm it. Comparision of
old_lock with LK_SHARED make sense only if vnode is locked by current
thread.

When downgrading, pass LK_RETRY to the vn_lock(), since otherwise
vn_lock() unlocks the doomed vnode, causing extra unlock.

Reported and tested by:	pho
Approved by:	re (rwatson)
MFC after:	3 weeks

END