Re: [PATCH v2 08/11] block: sed-opal: ioctl for writing to shadow mbr

[Christoph Hellwig]

On Mon, Mar 19, 2018 at 07:36:50PM +0100, Jonas Rabenstein wrote:
> Allow modification of the shadow mbr. If the shadow mbr is not marked as
> done, this data will be presented read only as the device content. Only
> after marking the shadow mbr as done and unlocking a locking range the
> actual content is accessible.

I hate doing this as an ioctls.  Can we make this a sysfs binary file
so that people can use dd or cat to write the shadow mbr?