linux-kernel - Re: [PATCH v7 07/31] netfs: Make a netfs helper module

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Date:   Thu, 29 Apr 2021 10:04:46 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     David Howells <dhowells@...hat.com>
Cc:     Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        Marc Dionne <marc.dionne@...istor.com>,
        Linux MM <linux-mm@...ck.org>, linux-cachefs@...hat.com,
        linux-afs@...ts.infradead.org,
        "open list:NFS, SUNRPC, AND..." <linux-nfs@...r.kernel.org>,
        linux-cifs@...r.kernel.org,
        ceph-devel <ceph-devel@...r.kernel.org>,
        V9FS Developers <v9fs-developer@...ts.sourceforge.net>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Steve French <sfrench@...ba.org>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Jeff Layton <jlayton@...hat.com>,
        David Wysochanski <dwysocha@...hat.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 07/31] netfs: Make a netfs helper module

Hi David,

On Fri, Apr 23, 2021 at 3:31 PM David Howells <dhowells@...hat.com> wrote:
> Make a netfs helper module to manage read request segmentation, caching
> support and transparent huge page support on behalf of a network
> filesystem.
>
> Signed-off-by: David Howells <dhowells@...hat.com>

Thanks for your patch, which is now commit 3ca236440126f75c ("mm:
Implement readahead_control pageset expansion") upstream.

> --- /dev/null
> +++ b/fs/netfs/Kconfig
> @@ -0,0 +1,8 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +
> +config NETFS_SUPPORT
> +       tristate "Support for network filesystem high-level I/O"
> +       help
> +         This option enables support for network filesystems, including
> +         helpers for high-level buffered I/O, abstracting out read
> +         segmentation, local caching and transparent huge page support.

TBH, this help text didn't give me any clue on whether I want to enable
this config option or not.  Do I need it for e.g. NFS, which is a
network filesystem?

I see later patches make AFS and FSCACHE select NETFS_SUPPORT.  If this
is just a library of functions, to be selected by its users, then please
make the symbol invisible.

Thanks!

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds