netdev - Re: [PATCHv2 dlm/next 11/12] dlm: add nldlm net-namespace aware UAPI

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Message-ID: <CAK-6q+h2-APvPUUDYgjGx2FzeJVkeAzH5Br+27A6bZyztfD5mA@mail.gmail.com>
Date: Mon, 30 Sep 2024 16:22:34 -0400
From: Alexander Aring <aahringo@...hat.com>
To: teigland@...hat.com
Cc: gfs2@...ts.linux.dev, song@...nel.org, yukuai3@...wei.com, 
	agruenba@...hat.com, mark@...heh.com, jlbec@...lplan.org, 
	joseph.qi@...ux.alibaba.com, gregkh@...uxfoundation.org, rafael@...nel.org, 
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, 
	linux-raid@...r.kernel.org, ocfs2-devel@...ts.linux.dev, 
	netdev@...r.kernel.org, vvidic@...entin-vidic.from.hr, heming.zhao@...e.com, 
	lucien.xin@...il.com, donald.hunter@...il.com
Subject: Re: [PATCHv2 dlm/next 11/12] dlm: add nldlm net-namespace aware UAPI

Hi,

On Mon, Sep 30, 2024 at 4:14 PM Alexander Aring <aahringo@...hat.com> wrote:
>
> Recent patches introduced support to separate DLM lockspaces on a per
> net-namespace basis. Currently the file based configfs mechanism is used
> to configure parts of DLM. Due the lack of namespace awareness (and it's
> probably complicated to add support for this) in configfs we introduce a
> socket based UAPI using "netlink". As the DLM subsystem offers now a
> config layer it can simultaneously being used with configfs, just that
> nldlm is net-namespace aware.
>
> Most of the current configfs functionality that is necessary to
> configure DLM is being adapted for now. The nldlm netlink interface
> offers also a multicast group for lockspace events NLDLM_MCGRP_EVENT.
> This event group can be used as alternative to the already existing udev
> event behaviour just it only contains DLM related subsystem events.
>
> Attributes e.g. nodeid, port, IP addresses are expected from the user
> space to fill those numbers as they appear on the wire. In case of DLM
> fields it is using little endian byte order.
>
> The dumps are being designed to scale in future with high numbers of
> members in a lockspace. E.g. dump members require an unique lockspace
> identifier (currently only the name) and nldlm is using a netlink dump
> behaviour to be prepared if all entries may not fit into one netlink
> message.
>
> Signed-off-by: Alexander Aring <aahringo@...hat.com>
> ---
>  Documentation/netlink/specs/nldlm.yaml |  438 ++++++++
>  fs/dlm/Makefile                        |    2 +
>  fs/dlm/config.c                        |   20 +-
>  fs/dlm/dlm_internal.h                  |    4 +
>  fs/dlm/lockspace.c                     |   13 +-
>  fs/dlm/netlink2.c                      | 1330 ++++++++++++++++++++++++

and this file shouldn't be there anymore. Will be dropped in v3.

- Alex