On Tue, Aug 25, 2020 at 10:17:32PM +0800, Ming Lei wrote:

Hi Jens,

The 1st patch add .mq_quiesce_mutex for serializing quiesce/unquiesce,
and prepares for replacing srcu with percpu_ref.

The 2nd patch replaces srcu with percpu_ref.

V2:
	- add .mq_quiesce_lock
	- add comment on patch 2 wrt. handling hctx_lock() failure
	- trivial patch style change


Ming Lei (2):
  blk-mq: serialize queue quiesce and unquiesce by mutex
  blk-mq: implement queue quiesce via percpu_ref for BLK_MQ_F_BLOCKING

 block/blk-core.c       |   2 +
 block/blk-mq-sysfs.c   |   2 -
 block/blk-mq.c         | 125 +++++++++++++++++++++++------------------
 block/blk-sysfs.c      |   6 +-
 include/linux/blk-mq.h |   7 ---
 include/linux/blkdev.h |   6 ++
 6 files changed, 82 insertions(+), 66 deletions(-)

Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Johannes Thumshirn <redacted>
Cc: Chao Leng <redacted>
Cc: Christoph Hellwig <hch@lst.de>

Hello Guys,

Is there any objections on the two patches? If not, I'd suggest to move
on.

Thanks,
Ming