K 10
svn:author
V 4
jeff
K 8
svn:date
V 27
2008-04-11T09:48:12.000000Z
K 7
svn:log
V 614
 - Use a lockmgr lock rather than a mtx to protect dirhash.  This lock
   may be held for the duration of the various dirhash operations which
   avoids many complex unlock/lock/revalidate sequences.
 - Permit shared locks on lookup.  To protect the ip->i_dirhash pointer we
   use the vnode interlock in the shared case.  Callers holding the
   exclusive vnode lock can run without fear of concurrent modification to
   i_dirhash.
 - Hold an exclusive dirhash lock when creating the dirhash structure for
   the first time or when re-creating a dirhash structure which has been
   recycled.

Tested by:	kris, pho

END