From: Christoph Hellwig <hch@lst.de>
To: Keith Busch <keith.busch@intel.com>
Cc: Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
Sagi Grimberg <sagi@grimberg.me>,
linux-nvme@lists.infradead.org, linux-block@vger.kernel.org
Subject: Re: [PATCH 9/9] nvme: implement multipath access to nvme subsystems
Date: Sun, 24 Sep 2017 16:48:31 +0200 [thread overview]
Message-ID: <20170924144831.GC13681@lst.de> (raw)
In-Reply-To: <20170922150915.GA1294@localhost.localdomain>
On Fri, Sep 22, 2017 at 11:09:16AM -0400, Keith Busch wrote:
> On Mon, Sep 18, 2017 at 04:14:53PM -0700, Christoph Hellwig wrote:
> > +static void nvme_failover_req(struct request *req)
> > +{
> > + struct nvme_ns *ns = req->q->queuedata;
> > + unsigned long flags;
> > +
> > + spin_lock_irqsave(&ns->head->requeue_lock, flags);
> > + blk_steal_bios(&ns->head->requeue_list, req);
> > + spin_unlock_irqrestore(&ns->head->requeue_lock, flags);
> > +
> > + nvme_reset_ctrl(ns->ctrl);
> > + kblockd_schedule_work(&ns->head->requeue_work);
> > +}
>
> Need to call blk_mq_free_req after stealing all its bios to prevent
> leaking that entered request.
I think this should be a blk_mq_end_request actually. The difference
is that blk_mq_end_request will get the I/O accounting right, and
treats the case of having and ->end_io handler correctly as well.
WARNING: multiple messages have this Message-ID (diff)
From: hch@lst.de (Christoph Hellwig)
Subject: [PATCH 9/9] nvme: implement multipath access to nvme subsystems
Date: Sun, 24 Sep 2017 16:48:31 +0200 [thread overview]
Message-ID: <20170924144831.GC13681@lst.de> (raw)
In-Reply-To: <20170922150915.GA1294@localhost.localdomain>
On Fri, Sep 22, 2017@11:09:16AM -0400, Keith Busch wrote:
> On Mon, Sep 18, 2017@04:14:53PM -0700, Christoph Hellwig wrote:
> > +static void nvme_failover_req(struct request *req)
> > +{
> > + struct nvme_ns *ns = req->q->queuedata;
> > + unsigned long flags;
> > +
> > + spin_lock_irqsave(&ns->head->requeue_lock, flags);
> > + blk_steal_bios(&ns->head->requeue_list, req);
> > + spin_unlock_irqrestore(&ns->head->requeue_lock, flags);
> > +
> > + nvme_reset_ctrl(ns->ctrl);
> > + kblockd_schedule_work(&ns->head->requeue_work);
> > +}
>
> Need to call blk_mq_free_req after stealing all its bios to prevent
> leaking that entered request.
I think this should be a blk_mq_end_request actually. The difference
is that blk_mq_end_request will get the I/O accounting right, and
treats the case of having and ->end_io handler correctly as well.
next prev parent reply other threads:[~2017-09-24 14:48 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-18 23:14 nvme multipath support V2 Christoph Hellwig
2017-09-18 23:14 ` Christoph Hellwig
2017-09-18 23:14 ` [PATCH 1/9] nvme: allow timed-out ios to retry Christoph Hellwig
2017-09-18 23:14 ` Christoph Hellwig
2017-09-18 23:14 ` [PATCH 2/9] block: move REQ_NOWAIT Christoph Hellwig
2017-09-18 23:14 ` Christoph Hellwig
2017-09-18 23:14 ` [PATCH 3/9] block: add REQ_DRV bit Christoph Hellwig
2017-09-18 23:14 ` Christoph Hellwig
2017-09-18 23:14 ` [PATCH 4/9] block: provide a direct_make_request helper Christoph Hellwig
2017-09-18 23:14 ` Christoph Hellwig
2017-09-18 23:14 ` [PATCH 5/9] block: add a blk_steal_bios helper Christoph Hellwig
2017-09-18 23:14 ` Christoph Hellwig
2017-09-18 23:14 ` [PATCH 6/9] nvme: track subsystems Christoph Hellwig
2017-09-18 23:14 ` Christoph Hellwig
2017-09-21 22:52 ` Keith Busch
2017-09-21 22:52 ` Keith Busch
2017-09-18 23:14 ` [PATCH 7/9] nvme: introduce a nvme_ns_ids structure Christoph Hellwig
2017-09-18 23:14 ` Christoph Hellwig
2017-09-20 8:27 ` Johannes Thumshirn
2017-09-20 8:27 ` Johannes Thumshirn
2017-09-18 23:14 ` [PATCH 8/9] nvme: track shared namespaces Christoph Hellwig
2017-09-18 23:14 ` Christoph Hellwig
2017-09-20 8:36 ` Johannes Thumshirn
2017-09-20 8:36 ` Johannes Thumshirn
2017-09-20 14:54 ` Christoph Hellwig
2017-09-20 14:54 ` Christoph Hellwig
2017-09-21 5:22 ` Johannes Thumshirn
2017-09-21 5:22 ` Johannes Thumshirn
2017-09-21 14:37 ` Christoph Hellwig
2017-09-21 14:37 ` Christoph Hellwig
2017-09-21 15:16 ` Keith Busch
2017-09-21 15:16 ` Keith Busch
2017-09-24 15:25 ` Christoph Hellwig
2017-09-24 15:25 ` Christoph Hellwig
2017-09-18 23:14 ` [PATCH 9/9] nvme: implement multipath access to nvme subsystems Christoph Hellwig
2017-09-18 23:14 ` Christoph Hellwig
2017-09-20 0:18 ` Tony Yang
2017-09-20 0:18 ` Tony Yang
2017-09-20 8:15 ` Johannes Thumshirn
2017-09-20 8:15 ` Johannes Thumshirn
2017-09-20 9:42 ` Johannes Thumshirn
2017-09-20 9:42 ` Johannes Thumshirn
2017-09-20 22:58 ` Keith Busch
2017-09-20 22:58 ` Keith Busch
2017-09-20 23:52 ` Christoph Hellwig
2017-09-20 23:52 ` Christoph Hellwig
2017-09-21 21:12 ` Keith Busch
2017-09-21 21:12 ` Keith Busch
2017-09-24 14:42 ` Christoph Hellwig
2017-09-24 14:42 ` Christoph Hellwig
2017-09-22 15:09 ` Keith Busch
2017-09-22 15:09 ` Keith Busch
2017-09-24 14:48 ` Christoph Hellwig [this message]
2017-09-24 14:48 ` Christoph Hellwig
2017-09-20 11:09 ` nvme multipath support V2 Johannes Thumshirn
2017-09-20 11:09 ` Johannes Thumshirn
2017-09-20 14:55 ` Christoph Hellwig
2017-09-20 14:55 ` Christoph Hellwig
2017-09-21 5:23 ` Johannes Thumshirn
2017-09-21 5:23 ` Johannes Thumshirn
2017-09-21 14:50 ` Christoph Hellwig
2017-09-21 14:50 ` Christoph Hellwig
2017-09-22 0:21 ` Tony Yang
2017-09-22 0:21 ` Tony Yang
2017-09-24 14:41 ` Christoph Hellwig
2017-09-24 14:41 ` Christoph Hellwig
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