[dm-devel] [PATCH V3] blk-mq: introduce BLK_STS_DEV_RESOURCE

[Mike Snitzer]

On Tue, Jan 23 2018 at 11:16am -0500,
Ming Lei <ming.lei at redhat.com> wrote:

> This status is returned from driver to block layer if device related
> resource is run out of, but driver can guarantee that IO dispatch will
> be triggered in future when the resource is available.
> 
> This patch converts some drivers to use this return value. Meantime
> if driver returns BLK_STS_RESOURCE and S_SCHED_RESTART is marked, run
> queue after 10ms for avoiding IO hang.
> 
> Suggested-by: Jens Axboe <axboe at kernel.dk>
> Tested-by: Laurence Oberman <loberman at redhat.com>
> Cc: Christoph Hellwig <hch at infradead.org>
> Cc: Mike Snitzer <snitzer at redhat.com>
> Cc: Laurence Oberman <loberman at redhat.com>
> Cc: Bart Van Assche <bart.vanassche at sandisk.com>
> Cc: Martin K. Petersen <martin.petersen at oracle.com>
> Cc: James E.J. Bottomley <jejb at linux.vnet.ibm.com>
> Signed-off-by: Ming Lei <ming.lei at redhat.com>

Acked-by: Mike Snitzer <snitzer at redhat.com>

Thanks Ming