linux-kernel - Re: Question about pNFS documentation

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Date: Fri, 14 Jun 2024 13:00:47 +0000
From: Chuck Lever III <chuck.lever@...cle.com>
To: ChenXiaoSong <chenxiaosong@...nxiaosong.com>
CC: Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker
	<anna@...nel.org>,
        Benjamin Coddington <bcodding@...hat.com>,
        Olga
 Kornievskaia <kolga@...app.com>,
        Josef Bacik <josef@...icpanda.com>, Jeff
 Layton <jlayton@...nel.org>,
        Linux NFS Mailing List
	<linux-nfs@...r.kernel.org>,
        Linux Kernel Mailing List
	<linux-kernel@...r.kernel.org>,
        "liuzhengyuan@...inos.cn"
	<liuzhengyuan@...inos.cn>,
        "huhai@...inos.cn" <huhai@...inos.cn>,
        "chenxiaosong@...inos.cn" <chenxiaosong@...inos.cn>
Subject: Re: Question about pNFS documentation

> On Jun 14, 2024, at 4:37 AM, ChenXiaoSong <chenxiaosong@...nxiaosong.com> wrote:
> 
> Thanks for your reply. By the way, are there any plans for the Linux NFS server to implement the file, flexfile and object layout?

The object layout type has been deprecated, IIRC. Support for
that type was removed from the Linux NFS client years ago. No
support for it in the server is planned.

The file layout type generally needs a cluster file system
on the back end. You could build something over Ceph or
gfs2, but it would be a significant effort and would need
user demand. Currently there isn't any.

The NFS server has a toy flexfile layout implementation
which is not much more than a proof of concept. We do have
an unscoped to-do to look at building that out to provide
a platform for testing the client's flexfile support. That
effort is not a high priority.

--
Chuck Lever