linux-kernel - Is it possible to backup and restore a configfs subsystem in userspace?

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Message-ID: <YrtTTCvsVKP94gxa@lars-laptop>
Date:   Tue, 28 Jun 2022 21:15:24 +0200
From:   linux@...llendorf.eu
To:     LKML <linux-kernel@...r.kernel.org>
Subject: Is it possible to backup and restore a configfs subsystem in
 userspace?

Hi!

If I create a configfs subsystem with some items and attributes in
there, is it possible to backup and restore them in user space?

My first experiments say no:

- rsync: read errors mapping "/sys/kernel/config/my/item": No data
  available
- tar: short read
- cp: skipping file '/sys/kernel/config/my/item', as it was replaced
  while being copied

But maybe I miss something here?

Cheers!
Lars