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Date:   Wed, 11 Nov 2020 09:03:34 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     "Martin K. Petersen" <martin.petersen@oracle.com>
Cc:     Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
        Ilya Dryomov <idryomov@gmail.com>, Song Liu <song@kernel.org>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Richard Weinberger <richard@nod.at>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        Stefan Haberland <sth@linux.ibm.com>,
        Jan Hoeppner <hoeppner@linux.ibm.com>,
        linux-block@vger.kernel.org, ceph-devel@vger.kernel.org,
        linux-bcache@vger.kernel.org, linux-raid@vger.kernel.org,
        linux-mtd@lists.infradead.org, linux-s390@vger.kernel.org
Subject: Re: [PATCH, RFC 11/10] block: propagate BLKROSET to all partitions
Message-ID: <20201111080334.GA23062@lst.de>
References: <20201106140817.GA23557@lst.de> <yq1imacecwz.fsf@ca-mkp.ca.oracle.com>
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On Tue, Nov 10, 2020 at 11:38:22PM -0500, Martin K. Petersen wrote:
> 
> Christoph,
> 
> > When setting the whole device read-only (or clearing the read-only
> > state), also update the policy for all partitions.  The s390 dasd
> > driver has awlways been doing this and it makes a lot of sense.
> 
> For your amusement, here's my attempt at addressing this from a while
> back. Can't remember exactly why this stranded, I even wrote blktests
> for it...

I added you to the Cc list because I had a vague memory that you were
looking into this area a while ago.

I actually think your patch that goes further is the right thing to do,
and I was going to look into something similar for a problem with
hardware read-only namespaces in NVMe.  I think I'll take your patch
as a starting point and will work from there.