linux-kernel - Re: [PATCH v2] libnvdimm: Notify disk drivers to revalidate region read-only

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Date:   Wed, 10 Mar 2021 15:30:02 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Christoph Hellwig <hch@....de>
Cc:     linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Ming Lei <ming.lei@...hat.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Hannes Reinecke <hare@...e.de>, Jens Axboe <axboe@...nel.dk>,
        kernel test robot <lkp@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-block@...r.kernel.org
Subject: Re: [PATCH v2] libnvdimm: Notify disk drivers to revalidate region read-only

On Tue, Mar 9, 2021 at 10:54 PM Christoph Hellwig <hch@....de> wrote:
>
> Looks good to me:
>
> Reviewed-by: Christoph Hellwig <hch@....de>
>
> Question on the pre-existing code: given that nvdimm_check_and_set_ro is
> the only caller of set_disk_ro for nvdimm devices, we'll also get
> the message when initially setting up any read-only disk.  Is that
> intentional?

Yeah, that's intentional. There's no other notification that userspace
would be looking for by default besides the kernel log, and the block
device name is more meaningful than the region name, or the nvdimm
device status for that matter.