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Message-ID: <3880860740b6b1d1eb14dfd21f11904eeee33ce5.camel@kernel.org>
Subject: Re: [PATCH v7 1/5] NFSD: convert write_threads to netlink command
From: Jeff Layton <jlayton@kernel.org>
To: Lorenzo Bianconi <lorenzo@kernel.org>, linux-nfs@vger.kernel.org
Cc: lorenzo.bianconi@redhat.com, chuck.lever@oracle.com, neilb@suse.de, 
	netdev@vger.kernel.org, kuba@kernel.org
Date: Fri, 12 Apr 2024 09:21:18 -0400
In-Reply-To: <d822328a8bdf7c796f6722139accba672466703a.1712853394.git.lorenzo@kernel.org>
References: <cover.1712853393.git.lorenzo@kernel.org>
	 <d822328a8bdf7c796f6722139accba672466703a.1712853394.git.lorenzo@kernel.org>
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On Thu, 2024-04-11 at 18:47 +0200, Lorenzo Bianconi wrote:
> Introduce write_threads netlink command similar to the one available
> through the procfs.
>=20
> Tested-by: Jeff Layton <jlayton@kernel.org>
> Reviewed-by: Jeff Layton <jlayton@kernel.org>
> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
> ---
>  Documentation/netlink/specs/nfsd.yaml | 23 ++++++++++
>  fs/nfsd/netlink.c                     | 17 ++++++++
>  fs/nfsd/netlink.h                     |  2 +
>  fs/nfsd/nfsctl.c                      | 60 +++++++++++++++++++++++++++
>  include/uapi/linux/nfsd_netlink.h     |  9 ++++
>  5 files changed, 111 insertions(+)
>=20
> diff --git a/Documentation/netlink/specs/nfsd.yaml b/Documentation/netlin=
k/specs/nfsd.yaml
> index 05acc73e2e33..c92e1425d316 100644
> --- a/Documentation/netlink/specs/nfsd.yaml
> +++ b/Documentation/netlink/specs/nfsd.yaml
> @@ -62,6 +62,12 @@ attribute-sets:
>          name: compound-ops
>          type: u32
>          multi-attr: true
> +  -
> +    name: server-worker
> +    attributes:
> +      -
> +        name: threads
> +        type: u32
> =20
>  operations:
>    list:
> @@ -87,3 +93,20 @@ operations:
>              - sport
>              - dport
>              - compound-ops
> +    -
> +      name: threads-set
> +      doc: set the number of running threads
> +      attribute-set: server-worker
> +      flags: [ admin-perm ]
> +      do:
> +        request:
> +          attributes:
> +            - threads

There's only one thing I think we're missing to get feature parity with
rpc.nfsd, and that's the ability to set the lease-time and grace-time
when starting the server.

I think the simplest thing to do would be to just add 2 optional int
parameters to the threads-set command. They only matter once you're
starting the server anyway. I'll see about spinning up a patch, but let
me know if you see problems with that approach.

> +    -
> +      name: threads-get
> +      doc: get the number of running threads
> +      attribute-set: server-worker
> +      do:
> +        reply:
> +          attributes:
> +            - threads
> diff --git a/fs/nfsd/netlink.c b/fs/nfsd/netlink.c
> index 0e1d635ec5f9..1a59a8e6c7e2 100644
> --- a/fs/nfsd/netlink.c
> +++ b/fs/nfsd/netlink.c
> @@ -10,6 +10,11 @@
> =20
>  #include <uapi/linux/nfsd_netlink.h>
> =20
> +/* NFSD_CMD_THREADS_SET - do */
> +static const struct nla_policy nfsd_threads_set_nl_policy[NFSD_A_SERVER_=
WORKER_THREADS + 1] =3D {
> +	[NFSD_A_SERVER_WORKER_THREADS] =3D { .type =3D NLA_U32, },
> +};
> +
>  /* Ops table for nfsd */
>  static const struct genl_split_ops nfsd_nl_ops[] =3D {
>  	{
> @@ -19,6 +24,18 @@ static const struct genl_split_ops nfsd_nl_ops[] =3D {
>  		.done	=3D nfsd_nl_rpc_status_get_done,
>  		.flags	=3D GENL_CMD_CAP_DUMP,
>  	},
> +	{
> +		.cmd		=3D NFSD_CMD_THREADS_SET,
> +		.doit		=3D nfsd_nl_threads_set_doit,
> +		.policy		=3D nfsd_threads_set_nl_policy,
> +		.maxattr	=3D NFSD_A_SERVER_WORKER_THREADS,
> +		.flags		=3D GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
> +	},
> +	{
> +		.cmd	=3D NFSD_CMD_THREADS_GET,
> +		.doit	=3D nfsd_nl_threads_get_doit,
> +		.flags	=3D GENL_CMD_CAP_DO,
> +	},
>  };
> =20
>  struct genl_family nfsd_nl_family __ro_after_init =3D {
> diff --git a/fs/nfsd/netlink.h b/fs/nfsd/netlink.h
> index d83dd6bdee92..4137fac477e4 100644
> --- a/fs/nfsd/netlink.h
> +++ b/fs/nfsd/netlink.h
> @@ -16,6 +16,8 @@ int nfsd_nl_rpc_status_get_done(struct netlink_callback=
 *cb);
> =20
>  int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
>  				  struct netlink_callback *cb);
> +int nfsd_nl_threads_set_doit(struct sk_buff *skb, struct genl_info *info=
);
> +int nfsd_nl_threads_get_doit(struct sk_buff *skb, struct genl_info *info=
);
> =20
>  extern struct genl_family nfsd_nl_family;
> =20
> diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
> index 93c87587e646..71608744e67f 100644
> --- a/fs/nfsd/nfsctl.c
> +++ b/fs/nfsd/nfsctl.c
> @@ -1651,6 +1651,66 @@ int nfsd_nl_rpc_status_get_done(struct netlink_cal=
lback *cb)
>  	return 0;
>  }
> =20
> +/**
> + * nfsd_nl_threads_set_doit - set the number of running threads
> + * @skb: reply buffer
> + * @info: netlink metadata and command arguments
> + *
> + * Return 0 on success or a negative errno.
> + */
> +int nfsd_nl_threads_set_doit(struct sk_buff *skb, struct genl_info *info=
)
> +{
> +	u32 nthreads;
> +	int ret;
> +
> +	if (GENL_REQ_ATTR_CHECK(info, NFSD_A_SERVER_WORKER_THREADS))
> +		return -EINVAL;
> +
> +	nthreads =3D nla_get_u32(info->attrs[NFSD_A_SERVER_WORKER_THREADS]);
> +	ret =3D nfsd_svc(nthreads,
> +		       genl_info_net(info), get_current_cred());
> +
> +	return ret =3D=3D nthreads ? 0 : -EINVAL;
> +}
> +
> +/**
> + * nfsd_nl_threads_get_doit - get the number of running threads
> + * @skb: reply buffer
> + * @info: netlink metadata and command arguments
> + *
> + * Return 0 on success or a negative errno.
> + */
> +int nfsd_nl_threads_get_doit(struct sk_buff *skb, struct genl_info *info=
)
> +{
> +	void *hdr;
> +	int err;
> +
> +	skb =3D genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
> +	if (!skb)
> +		return -ENOMEM;
> +
> +	hdr =3D genlmsg_iput(skb, info);
> +	if (!hdr) {
> +		err =3D -EMSGSIZE;
> +		goto err_free_msg;
> +	}
> +
> +	if (nla_put_u32(skb, NFSD_A_SERVER_WORKER_THREADS,
> +			nfsd_nrthreads(genl_info_net(info)))) {
> +		err =3D -EINVAL;
> +		goto err_free_msg;
> +	}
> +
> +	genlmsg_end(skb, hdr);
> +
> +	return genlmsg_reply(skb, info);
> +
> +err_free_msg:
> +	nlmsg_free(skb);
> +
> +	return err;
> +}
> +
>  /**
>   * nfsd_net_init - Prepare the nfsd_net portion of a new net namespace
>   * @net: a freshly-created network namespace
> diff --git a/include/uapi/linux/nfsd_netlink.h b/include/uapi/linux/nfsd_=
netlink.h
> index 3cd044edee5d..1b6fe1f9ed0e 100644
> --- a/include/uapi/linux/nfsd_netlink.h
> +++ b/include/uapi/linux/nfsd_netlink.h
> @@ -29,8 +29,17 @@ enum {
>  	NFSD_A_RPC_STATUS_MAX =3D (__NFSD_A_RPC_STATUS_MAX - 1)
>  };
> =20
> +enum {
> +	NFSD_A_SERVER_WORKER_THREADS =3D 1,
> +
> +	__NFSD_A_SERVER_WORKER_MAX,
> +	NFSD_A_SERVER_WORKER_MAX =3D (__NFSD_A_SERVER_WORKER_MAX - 1)
> +};
> +
>  enum {
>  	NFSD_CMD_RPC_STATUS_GET =3D 1,
> +	NFSD_CMD_THREADS_SET,
> +	NFSD_CMD_THREADS_GET,
> =20
>  	__NFSD_CMD_MAX,
>  	NFSD_CMD_MAX =3D (__NFSD_CMD_MAX - 1)

--=20
Jeff Layton <jlayton@kernel.org>