Hi all This patchset introduces a new bio retrieve mechanism. It will flush all the requests on queue, take the bios down from them and end them, then the bios will be submied again later. Then we could avoid: - fail requests on the dying hw queues - depend on storage device to drain the queue This 1st case could be fatal for filesystem and the 2nd case could cause IO hang in nvme_reset_work. The 1st patch introduces this feature. The 2nd patch apply it in the updating nr_hw_queues The 3rd patch unquiesces the queues after updating nr_hw_queues The 4th patch discards the cq_vector checking in nvme_queue_rq Jianchao Wang(4) blk-mq: introduce bio retrieve mechanism blk-mq: retrieve bios before update nr_hw_queues nvme-pci: unquiesce queues after update nr_hw_queues nvme-pci: discard the cq_vector checking in nvme_queue_rq block/blk-mq-sched.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++++ block/blk-mq.c | 50 ++++++++++++++++++++++++++++++- drivers/nvme/host/pci.c | 13 +++------ include/linux/blk-mq.h | 4 +++ include/linux/blkdev.h | 2 ++ 5 files changed, 137 insertions(+), 10 deletions(-) Thanks Jianchao
