On Mon, Aug 27, 2018 at 08:52:34AM -0600, Jens Axboe wrote:

On 8/27/18 1:24 AM, Ming Lei wrote:

quoted

Hi,

There is fundamental issue in commit 328728630d9f2bf1 (scsi: core: avoid
host-wide host_busy counter for scsi_mq) because SCSI's host busy counter
may not be same with counter of blk-mq's inflight tags, especially in case
of none io scheduler.

So please revert the two commits.

Please do, they break changing write cache mode on my SATA drives. You
can add my tested-by and/or reported-by to this.

Jens, how does it break? Could we add a blktest for it?