[PATCH 0/6] blk-mq: cleanup start/stop queue

Ming Lei
2017-07-14T23:16:22Z

Hi,

We have replaced most of start/stop queue via quiesce/unquiesce.
And only the usage in case of handling BLK_STS_RESOURCE is kept.
This patch moves this handling into blk-mq for xen-blkfront and
virtio-blk, then we can avoid to let drivers touch the 'stopped'
state, because allowing driver to do that has caused lots of trouble
for us.

Thanks,
Ming

Ming Lei (6):
xen-blkfront: quiesce/unquiesce queue instead of start/stop queues
SCSI: use blk_mq_run_hw_queues() in scsi_kick_queue()
block: don't call blk_mq_delay_run_hw_queue() in case of
BLK_STS_RESOURCE
blk-mq: introduce auto restart
block: use BLK_MQ_F_AUTO_RESTART on virtio-blk and xen-blkfront
blk-mq: unexport APIs for start/stop queues

block/blk-mq.c | 124 +++++++++++++++----------------------------
block/blk-mq.h | 1 +
drivers/block/virtio_blk.c | 8 +--
drivers/block/xen-blkfront.c | 31 +++--------
drivers/md/dm-rq.c | 1 -
drivers/nvme/host/fc.c | 3 --
drivers/scsi/scsi_lib.c | 6 +--
include/linux/blk-mq.h | 9 +---
8 files changed, 54 insertions(+), 129 deletions(-)

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2.9.4