[dm-devel] [PATCH 4/6] block: propagate BLKROSET on the whole device to all partitions

[Christoph Hellwig]

On Tue, Dec 08, 2020 at 06:29:23PM +0800, Ming Lei wrote:
> > -		test_bit(GD_READ_ONLY, &bdev->bd_disk->state);
> > +	return bdev->bd_read_only || get_disk_ro(bdev->bd_disk);
> >  }
> >  EXPORT_SYMBOL(bdev_read_only);
> 
> I think this patch should be folded into previous one, otherwise
> bdev_read_only(part) may return false even though ioctl(BLKROSET)
> has been done on the whole disk.

The above is the existing behavior going back back very far, and I feel
much more comfortable having a small self-contained patch that changes
this behavior.