On Mon, Apr 16, 2018 at 06:00:34PM -0700, Bart Van Assche wrote:
> This patch on itself does not change the behavior of either ioctl.
> However, this patch is necessary to avoid that these ioctls fail
> with -EIO if sd_revalidate_disk() is called while these ioctls are
> in progress because the current zoned block command code temporarily
> clears data that is needed by these ioctls. See also commit
> 3ed05a987e0f ("blk-zoned: implement ioctls").
Hmm. I think we need to avoid clearing that data and update it using
RCU instead. Calling blk_queue_enter before submitting bios is
something that would make zone reporting very different from any
other block layer user.