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Date:   Mon, 1 Nov 2021 15:26:06 -0400
From:   Bruce Fields <bfields@fieldses.org>
To:     Steve Dickson <steved@redhat.com>
Cc:     Chuck Lever III <chuck.lever@oracle.com>,
        Linux NFS Mailing List <linux-nfs@vger.kernel.org>
Subject: Re: [PATCH 0/1] Enable inter server to server copies on a export
Message-ID: <20211101192606.GC14427@fieldses.org>
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On Mon, Nov 01, 2021 at 03:10:31PM -0400, Steve Dickson wrote:
> 
> 
> On 11/1/21 14:39, Bruce Fields wrote:
> >diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> >index 91ba391f9b32..14bc3f0b0149 100644
> >--- a/Documentation/admin-guide/kernel-parameters.txt
> >+++ b/Documentation/admin-guide/kernel-parameters.txt
> >@@ -3243,6 +3243,19 @@
> >  			driver. A non-zero value sets the minimum interval
> >  			in seconds between layoutstats transmissions.
> >+	nfsd.inter_copy_offload_enable =
> >+			[NFSv4.2] When set to 1, the server will support
> >+			server-to-server copies for which this server is
> >+			the destination of the copy.
> >+
> >+	nfsd.nfsd4_ssc_umount_timeout =
> >+			[NFSv4.2] When used as the destination of a
> >+			server-to-server copy, knfsd temporarily mounts
> >+			the source server.  It caches the mount in case
> >+			it will be needed again, and discards it if not
> >+			used for the number of milliseconds specified by
> >+			this parameter.
> >+
> >  	nfsd.nfs4_disable_idmapping=
> >  			[NFSv4] When set to the default of '1', the NFSv4
> >  			server will return only numeric uids and gids to
> >@@ -3250,6 +3263,7 @@
> >  			and gids from such clients.  This is intended to ease
> >  			migration from NFSv2/v3.
> >+
> >  	nmi_backtrace.backtrace_idle [KNL]
> >  			Dump stacks even of idle CPUs in response to an
> >  			NMI stack-backtrace request.
> >
> Interesting... I don't see these in the Linus tree I'm looking at [1]
> find Documentation/ -type f  | xargs grep -i inter_copy_offload_enable

I was suggesting that as a patch.  It's queued up for 5.16 now.

--b.