[PATCH V3 0/4] blk-mq: implement queue quiesce via percpu_ref for BLK_MQ_F_BLOCKING

[Ming Lei]

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.

The 3rd patch adds tagset quiesce interface.

The 4th patch applies tagset quiesce interface for NVMe subsystem.


V3:
	- add tagset quiesce interface
	- apply tagset quiesce interface for NVMe
	- pass blktests(block, nvme)

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



Ming Lei (3):
  blk-mq: serialize queue quiesce and unquiesce by mutex
  blk-mq: implement queue quiesce via percpu_ref for BLK_MQ_F_BLOCKING
  blk-mq: add tagset quiesce interface

Sagi Grimberg (1):
  nvme: use blk_mq_[un]quiesce_tagset

 block/blk-core.c         |   2 +
 block/blk-mq-sysfs.c     |   2 -
 block/blk-mq.c           | 177 +++++++++++++++++++++++++--------------
 block/blk-sysfs.c        |   6 +-
 drivers/nvme/host/core.c |  19 ++---
 include/linux/blk-mq.h   |  10 +--
 include/linux/blkdev.h   |   6 ++
 7 files changed, 140 insertions(+), 82 deletions(-)

Cc: Sagi Grimberg <sagi at grimberg.me>
Cc: Bart Van Assche <bvanassche at acm.org>
Cc: Johannes Thumshirn <Johannes.Thumshirn at wdc.com>
Cc: Chao Leng <lengchao at huawei.com>
-- 
2.25.2