lsof and ZFS
NOTE: Vic Abell has released lsof-4.82D.sun, making this obsolete.
Sadly, Sun still doesn't ship ZFS headers with Solaris. I looked at the history of zfs_znode.h and created this patch by trial and error. It should work for systems using versions of zfs_znode.h between 3897 (26-Mar-2007) and 5367 (29-Oct-2007), including Solaris 10 10/2008 (a.k.a. Solaris 10 U6). Click the diff below to dowload the patch file.