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

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Message-ID: <20180319195224.GA3380@lst.de>
Date:   Mon, 19 Mar 2018 20:52:24 +0100
From:   Christoph Hellwig <hch@....de>
To:     Jonas Rabenstein <jonas.rabenstein@...dium.uni-erlangen.de>
Cc:     Scott Bauer <scott.bauer@...el.com>,
        Jonathan Derrick <jonathan.derrick@...el.com>,
        Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 08/11] block: sed-opal: ioctl for writing to shadow
        mbr

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?