linux-kernel - Re: [PATCH v3 2/3] fs: fuse: add backing

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Message-ID: <CAJfpegvqSsa7XyQyO9ugv0=tLhLDg8GSyd8HO8TG2e_nLxJVHg@mail.gmail.com>
Date: Fri, 9 May 2025 17:16:09 +0200
From: Miklos Szeredi <miklos@...redi.hu>
To: Chen Linxuan <chenlinxuan@...ontech.com>
Cc: Amir Goldstein <amir73il@...il.com>, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] fs: fuse: add backing_files control file

On Fri, 9 May 2025 at 17:11, Chen Linxuan <chenlinxuan@...ontech.com> wrote:
>
> On Fri, May 9, 2025 at 10:59 PM Miklos Szeredi <miklos@...redi.hu> wrote:
>
> > And that has limitations, since fdinfo lacks a hierarchy.  E.g.
> > recursively retrieving "hidden files" info is impractical.
>
> What does "recursively" refer to in this context?
> I am not entirely sure what kind of situation it implies.
> Do you mean, for example, when a fixed file is a FUSE fd and it has a
> backing file?

Yeah.  I don't see any practical relevance today, but allowing to
retrieve any attribute of these hidden files (fdinfo and hidden files
included) is a good thing that the flat nature of the current fdinfo
inteface makes difficult.

I'd argue that many current uses of fdinfo could be enabled with the
listxattr/getxattr inteface and would improve usablility (no need to
parse the fdinfo file to skip unneeded info).

Thanks,
Miklos
>
> Thanks,
> Chen Linxuan