Can't get quite that far - note that mdb doesn't load the vxfs module by 
default even if VxVM/VxFS are installed and in use on the machine - haven't 
been able to figure out how to load it manually either - using ::load 
/kernel/fs/sparcv9/vxfs gets me a "page_downgrade: referenced symbol not found" 
error.  I'm guessing that I have to load some other module first - just not 
clear which one.

> For kernel modules, _if_ the supplied kernel code
> (driver, file system, 
> whatever),
> was compiled with symbolic information, you can
> determine the argument list
> and types with mdb:
> 
> # mdb -k
> Loading modules: [ unix genunix specfs dtrace uppc
> pcplusmp scsi_vhci 
> ufs mpt ip hook neti sctp arp usba fctl nca lofs zfs
> random audiosup 
> sppp ptm crypto ipc md cpc fcip fcp logindmux nsctl
> sdbc sv ii rdc ]
>  >ufs_read::nm -f ctype
>  Type                                           
> nt (*)(struct vnode *, struct uio *, int, struct cred
> *, struct 
> caller_context *)
>


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