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

[Alexander Aring]

Hi,

On Mon, Sep 30, 2024 at 4:14 PM Alexander Aring <aahringo@xxxxxxxxxx> 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@xxxxxxxxxx>
> ---
>  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