Re: [RFC-PATCH] nfsd: provide a procfs entry to release stateids of a particular local filesystem

["Alex Lyakas" <alex@zadara.com>]

Hi Bruce,

All client mount points look like:
10.2.7.22:/export/s1 /mnt/s1 nfs4 
rw,noatime,vers=4.0,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=10.2.7.102,local_lock=none,addr=10.2.7.22 
0 0

So I believe these are all 4.0. The client and the server are in the same 
subnet, without any NAT or firewalls.

Thanks,
Alex.


-----Original Message----- 
From: J. Bruce Fields
Sent: Monday, September 23, 2019 7:25 PM
To: Alex Lyakas
Cc: linux-nfs@vger.kernel.org ; Shyam Kaushik
Subject: Re: [RFC-PATCH] nfsd: provide a procfs entry to release stateids of 
a particular local filesystem

On Sun, Sep 22, 2019 at 09:52:36AM +0300, Alex Lyakas wrote:
> I do see in the code that a delegation stateid also holds an open
> file on the file system. In my experiments, however, the
> nfs4_client::cl_delegations list was always empty. I put an extra
> print to print a warning if it's not, but did not hit this.

Do you know what version of NFS the clients are using?  (4.0, 4.1, 4.2?)

--b.

>
> Thanks,
> Alex.
>
>
>
> -----Original Message----- From: J. Bruce Fields
> Sent: Tuesday, September 10, 2019 11:25 PM
> To: Alex Lyakas
> Cc: linux-nfs@vger.kernel.org ; Shyam Kaushik
> Subject: Re: [RFC-PATCH] nfsd: provide a procfs entry to release
> stateids of a particular local filesystem
>
> On Tue, Sep 10, 2019 at 10:00:24PM +0300, Alex Lyakas wrote:
> >I addressed your comments, and ran the patch through checkpatch.pl.
> >Patch v2 is on its way.
>
> Thanks for the revision!  I need to spend the next week or so catching
> up on some other review and then I'll get back to this.
>
> For now:
>
> >On Fri, Sep 6, 2019 at 7:12 PM J. Bruce Fields
> ><bfields@fieldses.org> wrote:
> >> You'll want to cover delegations as well.  And probably pNFS layouts.
> >> It'd be OK to do that incrementally in followup patches.
> >Unfortunately, I don't have much understanding of what these are, and
> >how to cover them)
>
> Delegations are give the client the right to cache files across opens.
> I'm a little surprised your patches are working for you without handling
> delegations.  There may be something about your environment that's
> preventing delegations from being given out.  In the NFSv4.0 case they
> require the server to make a tcp connection back the client, which is
> easy blocked by firewalls or NAT.  Might be worth testing with v4.1 or
> 4.2.
>
> Anyway, so we probably also want to walk the client's dl_perclnt list
> and look for matching files.
>
> --b.