On Sat, May 16, 2020 at 03:19:55AM +0000, Luis Chamberlain wrote:

We use one blktrace per request_queue, that means one per the entire
disk.  So we cannot run one blktrace on say /dev/vda and then /dev/vda1,
or just two calls on /dev/vda.

We check for concurrent setup only at the very end of the blktrace setup though.

Too long line in the changelog.

Otherwise this looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>