linux-kernel - Re: [RFC V2 11/18] famfs_fuse: Basic famfs mount opts

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Message-ID: <CAJfpegspQYVbWVztU5_XFwbGaTQKe2NCm2mcui6J3qv1VDxdSQ@mail.gmail.com>
Date: Thu, 14 Aug 2025 12:37:08 +0200
From: Miklos Szeredi <miklos@...redi.hu>
To: "Darrick J. Wong" <djwong@...nel.org>
Cc: John Groves <John@...ves.net>, Dan Williams <dan.j.williams@...el.com>, 
	Bernd Schubert <bschubert@....com>, John Groves <jgroves@...ron.com>, Jonathan Corbet <corbet@....net>, 
	Vishal Verma <vishal.l.verma@...el.com>, Dave Jiang <dave.jiang@...el.com>, 
	Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>, 
	Alexander Viro <viro@...iv.linux.org.uk>, Christian Brauner <brauner@...nel.org>, 
	Randy Dunlap <rdunlap@...radead.org>, Jeff Layton <jlayton@...nel.org>, 
	Kent Overstreet <kent.overstreet@...ux.dev>, linux-doc@...r.kernel.org, 
	linux-kernel@...r.kernel.org, nvdimm@...ts.linux.dev, 
	linux-cxl@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
	Amir Goldstein <amir73il@...il.com>, Jonathan Cameron <Jonathan.Cameron@...wei.com>, 
	Stefan Hajnoczi <shajnocz@...hat.com>, Joanne Koong <joannelkoong@...il.com>, 
	Josef Bacik <josef@...icpanda.com>, Aravind Ramesh <arramesh@...ron.com>, 
	Ajay Joshi <ajayjoshi@...ron.com>
Subject: Re: [RFC V2 11/18] famfs_fuse: Basic famfs mount opts

On Sat, 12 Jul 2025 at 07:54, Darrick J. Wong <djwong@...nel.org> wrote:
>
> On Fri, Jul 11, 2025 at 10:28:20AM -0500, John Groves wrote:

> >     famfs_fuse: Basic famfs mount opt: -o shadow=<shadowpath>
> >
> >     The shadow path is a (usually tmpfs) file system area used by the famfs
> >     user space to commuicate with the famfs fuse server. There is a minor
> >     dilemma that the user space tools must be able to resolve from a mount
> >     point path to a shadow path. The shadow path is exposed via /proc/mounts,
> >     but otherwise not used by the kernel. User space gets the shadow path
> >     from /proc/mounts...

Don't know if we want to go that way.  Is there no other way?

But if we do, at least do it in a generic way.  I.e. fuse server can
tell the kernel to display options A, B and C in /proc/mounts.

Thanks,
Miklos