Re: [PATCH 0/1] Enable inter server to server copies on a export

Bruce Fields
2021-11-01T18:39:19Z

On Mon, Nov 01, 2021 at 04:55:45PM +0000, Chuck Lever III wrote:
>
> > On Nov 1, 2021, at 11:40 AM, J. Bruce Fields <bfields@fieldses.org> wrote:
> >
> > On Mon, Nov 01, 2021 at 11:30:48AM -0400, Steve Dickson wrote:
> >> Hey!
> >>
> >> On 10/29/21 15:14, J. Bruce Fields wrote:
> >>> On Fri, Oct 29, 2021 at 01:30:36PM -0400, Steve Dickson wrote:
> >>>> On 10/29/21 12:40, J. Bruce Fields wrote:
> >>>>> Let's just stick with that for now, and leave it off by default until
> >>>>> we're sure it's mature enough. Let's not introduce new configuration to
> >>>>> work around problems that we haven't really analyzed yet.
> >>>> How is this going to find problems? At least with the export option
> >>>> it is documented
> >>>
> >>> That sounds fixable. We need documentation of module parameters anyway.
> >> Yeah I just took I don't see any documentation of module
> >> parameters anywhere for any of the modules. But by documentation
> >> I meant having the feature in the exports(5) manpage.
> >
> > I think I'd probably create a new page for sysctls (this isn't the only
> > one needing documentation), and make sure it's listed in the "SEE ALSO"
> > section of the other man pages.
>
> Aren't sysctls documented under Documentation/ ?

Sorry, I meant "module parameter". Anyway, yes, looks like both are
listed in Documentation/admin-guide/kernel-parameters.txt.

Might be nice if these were in a man page too somewhere, but maybe
that's not the most important thing these days.

--b.

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.