Hello, dm-rq may be built on blk-mq device which marks BLK_MQ_F_BLOCKING, so dm_mq_queue_rq() may become to sleep current context. Fixes the issue by allowing dm-rq to set BLK_MQ_F_BLOCKING in case that any underlying queue is marked as BLK_MQ_F_BLOCKING. DM request queue is allocated before allocating tagset, this way is a bit special, so we need to pre-allocate srcu payload, then use the queue flag of QUEUE_FLAG_BLOCKING for locking dispatch. Ming Lei (3): block: split having srcu from queue blocking block: add blk_alloc_disk_srcu dm: mark dm queue as blocking if any underlying is blocking block/blk-core.c | 2 +- block/blk-mq.c | 6 +++--- block/blk-mq.h | 2 +- block/blk-sysfs.c | 2 +- block/genhd.c | 5 +++-- drivers/md/dm-rq.c | 5 ++++- drivers/md/dm-rq.h | 3 ++- drivers/md/dm-table.c | 14 ++++++++++++++ drivers/md/dm.c | 5 +++-- drivers/md/dm.h | 1 + include/linux/blkdev.h | 5 +++-- include/linux/genhd.h | 12 ++++++++---- 12 files changed, 44 insertions(+), 18 deletions(-) -- 2.31.1 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/dm-devel
