On Wed, Sep 02, 2020 at 11:52:59AM -0600, Jens Axboe wrote: > On 9/1/20 9:11 PM, Ming Lei wrote: > > 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@xxxxxxxxx> > >> Cc: Paul E. McKenney <paulmck@xxxxxxxxxx> > >> Cc: Josh Triplett <josh@xxxxxxxxxxxxxxxx> > >> Cc: Sagi Grimberg <sagi@xxxxxxxxxxx> > >> Cc: Bart Van Assche <bvanassche@xxxxxxx> > >> Cc: Johannes Thumshirn <Johannes.Thumshirn@xxxxxxx> > >> Cc: Chao Leng <lengchao@xxxxxxxxxx> > >> Cc: Christoph Hellwig <hch@xxxxxx> > > > > Hello Guys, > > > > Is there any objections on the two patches? If not, I'd suggest to move> on. > > Seems like the nested case is one that should either be handled, or at > least detected. Yeah, the 1st patch adds mutex for handling nested case correctly and efficiently. Thanks, Ming
