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Re: [PATCH RFC 38/41] fuse: refuse files on pseudo filesystems as passthrough backing files
- To: Christoph Hellwig <hch@xxxxxx>, Christian Brauner <brauner@xxxxxxxxxx>
- From: Alexander Mikhalitsyn <alex@xxxxxxxxxxxx>
- Date: Fri, 13 Nov 2026 11:25:57 +0100
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- Cc: linux-fsdevel@xxxxxxxxxxxxxxx, Jann Horn <jannh@xxxxxxxxxx>, Chris Mason <mason@xxxxxxxxxx>, Josef Bacik <josef@xxxxxxxxxxxxxx>, linux-block@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-nvme@xxxxxxxxxxxxxxxxxxx, Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, Jan Kara <jack@xxxxxxx>, linux-scsi@xxxxxxxxxxxxxxx, target-devel@xxxxxxxxxxxxxxx, driver-core@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, bpf@xxxxxxxxxxxxxxx, linux-security-module@xxxxxxxxxxxxxxx, selinux@xxxxxxxxxxxxxxx, apparmor@xxxxxxxxxxxxxxxx, linux-nfs@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, fuse-devel@xxxxxxxxxxxxxxx, linux-efi@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, ocfs2-devel@xxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-usb@xxxxxxxxxxxxxxx, Amir Goldstein <amir73il@xxxxxxxxx>, linux-erofs@xxxxxxxxxxxxxxxx, linux-kselftest@xxxxxxxxxxxxxxx
- Delivery-date: Fri, 13 Nov 2026 10:26:06 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hi Christoph,
On Wed, 2026-11-11 at 16:12 +0100, Christoph Hellwig wrote:
> I've seen setups where people use fuse to mediate access to sysfs
> sysfs in odd ways. No idea if that's still around, but if so, this
> patch will break it.
Oh, that's painful. Do they use backing files for that?
It's a relatively new feature in FUSE...
Kind regards,
Alex
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