[OmniOS-discuss] Getting detailed NFS lock information on an OmniOS NFS server

[Scott LeFevre]

This may help (or may not).  I presume this will work on OmniOS as it
works on other Illumos variants.

You can enable logging on an nfs share by adding 'log' to the sharenfs
property of a zfs file system.  For example, on one of my systems I have

$ zfs get sharenfs pool0/media
NAME           PROPERTY  VALUE                           SOURCE
pool0/example  sharenfs  sec=sys,log,rw=@10.1.1.0/24:... local


After this change, svc:/network/nfs/log:default is enabled automatically
and a log file 'nfslog' (and other related files) can be found
int /var/nfs.  I don't know if this records the locks but it will at
least show who/what is accessing files under an nfs share.  BTW, the
nfs/log service collects information for a bit before it drops it into
the nfslog file.

-- 
Scott LeFevre
317-696-1010 

On Mon, 2014-08-11 at 23:49 -0400, Chris Siebenmann wrote:

> Here's a question: does anyone know of a good way to get detailed NFS
> lock information on an OmniOS NFS server, especially information like
> which client has a lock on a particular file?
> 
>  'mdb -k' can be used to extract basic lock information, like the full
> paths of all files that have active locks against them[*], but my old
> Solaris mdb commands for getting more detailed NFS information don't
> work in the OmniOS mdb any more.
> 
>  Thanks in advance.
> 
> (I'll happily take pointers to where to look in the kernel implementation
> to follow struct pointers by hand with mdb's ::print and so on. From what
> I've found so far, I'm looking at usr/src/uts/common/klm to start with; is
> this right?)
> 
> 	- cks
> [*: via mdb's ::lminfo and '::walk lock_graph', see eg
>     http://utcc.utoronto.ca/~cks/space/blog/solaris/ListingFileLocks
> 
>     Solaris 10 also had ::nlm_lockson, which is still present in mdb
>     but doesn't seem to work any more, presumably because the actual
>     NFS locking implementation changed.
> ]
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