From mboxrd@z Thu Jan 1 00:00:00 1970 From: Oleksandr Natalenko Subject: Re: [PATCH V8 0/8] block/scsi: safe SCSI quiescing Date: Tue, 03 Oct 2017 20:27:56 +0200 Message-ID: <2586333.Nyo4hBpWP3@natalenko.name> References: <20171003140406.26060-1-ming.lei@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <20171003140406.26060-1-ming.lei@redhat.com> Sender: linux-kernel-owner@vger.kernel.org To: Ming Lei Cc: Jens Axboe , linux-block@vger.kernel.org, Christoph Hellwig , linux-scsi@vger.kernel.org, "Martin K . Petersen" , "James E . J . Bottomley" , Bart Van Assche , Johannes Thumshirn , Cathy Avery , Martin Steigerwald , linux-kernel@vger.kernel.org, Hannes Reinecke List-Id: linux-scsi@vger.kernel.org Also Tested-by: Oleksandr Natalenko for whole v8. On =C3=BAter=C3=BD 3. =C5=99=C3=ADjna 2017 16:03:58 CEST Ming Lei wrote: > Hi Jens, >=20 > Please consider this patchset for V4.15, and it fixes one > kind of long-term I/O hang issue in either block legacy path > or blk-mq. >=20 > The current SCSI quiesce isn't safe and easy to trigger I/O deadlock. >=20 > Once SCSI device is put into QUIESCE, no new request except for > RQF_PREEMPT can be dispatched to SCSI successfully, and > scsi_device_quiesce() just simply waits for completion of I/Os > dispatched to SCSI stack. It isn't enough at all. >=20 > Because new request still can be comming, but all the allocated > requests can't be dispatched successfully, so request pool can be > consumed up easily. >=20 > Then request with RQF_PREEMPT can't be allocated and wait forever, > then system hangs forever, such as during system suspend or > sending SCSI domain alidation in case of transport_spi. >=20 > Both IO hang inside system suspend[1] or SCSI domain validation > were reported before. >=20 > This patch introduces preempt only mode, and solves the issue > by allowing RQF_PREEMP only during SCSI quiesce. >=20 > Both SCSI and SCSI_MQ have this IO deadlock issue, this patch fixes > them all. >=20 > V8: > - fix one race as pointed out by Bart > - pass 'op' to blk_queue_enter() as suggested by Christoph >=20 > V7: > - add Reviewed-by & Tested-by > - one line change in patch 5 for checking preempt request >=20 > V6: > - borrow Bart's idea of preempt only, with clean > implementation(patch 5/patch 6) > - needn't any external driver's dependency, such as MD's > change >=20 > V5: > - fix one tiny race by introducing blk_queue_enter_preempt_freeze() > given this change is small enough compared with V4, I added > tested-by directly >=20 > V4: > - reorganize patch order to make it more reasonable > - support nested preempt freeze, as required by SCSI transport spi > - check preempt freezing in slow path of of blk_queue_enter() > - add "SCSI: transport_spi: resume a quiesced device" > - wake up freeze queue in setting dying for both blk-mq and legacy > - rename blk_mq_[freeze|unfreeze]_queue() in one patch > - rename .mq_freeze_wq and .mq_freeze_depth > - improve comment >=20 > V3: > - introduce q->preempt_unfreezing to fix one bug of preempt freeze > - call blk_queue_enter_live() only when queue is preempt frozen > - cleanup a bit on the implementation of preempt freeze > - only patch 6 and 7 are changed >=20 > V2: > - drop the 1st patch in V1 because percpu_ref_is_dying() is > enough as pointed by Tejun > - introduce preempt version of blk_[freeze|unfreeze]_queue > - sync between preempt freeze and normal freeze > - fix warning from percpu-refcount as reported by Oleksandr >=20 >=20 > [1] https://marc.info/?t=3D150340250100013&r=3D3&w=3D2 >=20 >=20 > Thanks, > Ming >=20 > Bart Van Assche (1): > block: Convert RQF_PREEMPT into REQ_PREEMPT >=20 > Ming Lei (7): > blk-mq: only run hw queues for blk-mq > block: tracking request allocation with q_usage_counter > block: pass 'op' to blk_queue_enter() > percpu-refcount: introduce __percpu_ref_tryget_live > blk-mq: return if queue is frozen via current blk_freeze_queue_start > block: support PREEMPT_ONLY > SCSI: set block queue at preempt only when SCSI device is put into > quiesce >=20 > block/blk-core.c | 66 > +++++++++++++++++++++++++++++++++++++---- block/blk-mq-debugfs.c = | > 2 +- > block/blk-mq.c | 26 ++++++++-------- > block/blk-mq.h | 1 - > block/blk-timeout.c | 2 +- > block/blk.h | 2 +- > drivers/ide/ide-atapi.c | 3 +- > drivers/ide/ide-io.c | 2 +- > drivers/ide/ide-pm.c | 4 +-- > drivers/scsi/scsi_lib.c | 31 +++++++++++++++---- > fs/block_dev.c | 4 +-- > include/linux/blk-mq.h | 4 +-- > include/linux/blk_types.h | 6 ++++ > include/linux/blkdev.h | 10 ++++--- > include/linux/percpu-refcount.h | 27 ++++++++++------- > 15 files changed, 137 insertions(+), 53 deletions(-)