[systemd-devel] udev and btrfs multiple devices

[Greg KH]

On Wed, Jan 27, 2021 at 05:19:38PM -0700, Chris Murphy wrote:
> 
> Next, is it possible to enhance udev so that it can report the number
> of devices expected for a Btrfs file system? This information is
> currently in the Btrfs superblock found on each device in the
> num_devices field.
> https://github.com/storaged-project/udisks/pull/838#issuecomment-768372627

It's not up to udev to report that, but rather have either the kernel
export that, or have the tool that udev calls determine that.

thanks,

greg k-h