From: Chao Leng <lengchao@huawei.com>
To: Christoph Hellwig <hch@infradead.org>, Mike Snitzer <snitzer@redhat.com>
Cc: Keith Busch <kbusch@kernel.org>, Hannes Reinecke <hare@suse.de>,
"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
Ewan Milne <emilne@redhat.com>,
"Meneghini, John" <John.Meneghini@netapp.com>
Subject: Re: [PATCH] nvme: restore use of blk_path_error() in nvme_complete_rq()
Date: Tue, 11 Aug 2020 11:45:40 +0800 [thread overview]
Message-ID: <67e83d28-a785-a1fd-7787-24d1217ca30b@huawei.com> (raw)
In-Reply-To: <20200810124355.GB25070@infradead.org>
On 2020/8/10 20:43, Christoph Hellwig wrote:
> Just returning from my vacation, and I'm really surprised about
> this discussion.
>
> If you want to fix a device mapper / block layer interaction you do
> not change nvme code to use suboptimal interfaces.
Agree. Nvme define path error and local retry mechanism. It is more
reasonable to use the new mechanism.
>
> One of the reasons for the nvme multipath design was to allow for
> tighter integration with protocol features, and making nvme do a detour
> through the block layer for no good reason at all does not help with
> that at all.
Nvme should use local retry mechanism. But now we first check the flag:
REQ_FAILFAST_TRANSPORT, if work with dm-multipath, REQ_FAILFAST_TRANSPORT
will be set, this interrupt local retry.
>
> And if you want to support the TP that added the new command interrupted
> status code please read through it - the status code itself is just a
> small part of it, and none of the changes proposed in these discussions
> would lead to a proper implementation.
> .
>
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next prev parent reply other threads:[~2020-08-11 3:45 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-27 5:58 [PATCH] nvme-core: fix io interrupt when work with dm-multipah Chao Leng
2020-07-28 11:19 ` Christoph Hellwig
2020-07-29 2:54 ` Chao Leng
2020-07-29 5:59 ` Christoph Hellwig
2020-07-30 1:49 ` Chao Leng
2020-08-05 6:40 ` Chao Leng
2020-08-05 15:29 ` Keith Busch
2020-08-06 5:52 ` Chao Leng
2020-08-06 14:26 ` Keith Busch
2020-08-06 15:59 ` Meneghini, John
2020-08-06 16:17 ` Meneghini, John
2020-08-06 18:40 ` Mike Snitzer
2020-08-06 19:19 ` [PATCH] nvme: restore use of blk_path_error() in nvme_complete_rq() Mike Snitzer
2020-08-06 22:42 ` Meneghini, John
2020-08-07 0:07 ` Mike Snitzer
2020-08-07 1:21 ` Sagi Grimberg
2020-08-07 4:50 ` Mike Snitzer
2020-08-07 23:35 ` Sagi Grimberg
2020-08-08 21:08 ` Meneghini, John
2020-08-08 21:11 ` Meneghini, John
2020-08-10 14:48 ` Mike Snitzer
2020-08-11 12:54 ` Meneghini, John
2020-08-10 8:10 ` Chao Leng
2020-08-11 12:36 ` Meneghini, John
2020-08-12 7:51 ` Chao Leng
2020-08-10 14:36 ` Mike Snitzer
2020-08-10 17:22 ` [PATCH] nvme: explicitly use normal NVMe error handling when appropriate Mike Snitzer
2020-08-11 3:32 ` Chao Leng
2020-08-11 4:20 ` Mike Snitzer
2020-08-11 6:17 ` Chao Leng
2020-08-11 14:12 ` Mike Snitzer
2020-08-13 14:48 ` [RESEND PATCH] " Mike Snitzer
2020-08-13 15:29 ` Meneghini, John
2020-08-13 15:43 ` Mike Snitzer
2020-08-13 15:59 ` Meneghini, John
2020-08-13 15:36 ` Christoph Hellwig
2020-08-13 17:47 ` Mike Snitzer
2020-08-13 18:43 ` Christoph Hellwig
2020-08-13 19:03 ` Mike Snitzer
2020-08-14 4:26 ` Meneghini, John
2020-08-14 6:53 ` Sagi Grimberg
2020-08-14 6:55 ` Christoph Hellwig
2020-08-14 7:02 ` Sagi Grimberg
2020-08-14 3:23 ` Meneghini, John
2020-08-07 0:44 ` [PATCH] nvme: restore use of blk_path_error() in nvme_complete_rq() Sagi Grimberg
2020-08-10 12:43 ` Christoph Hellwig
2020-08-10 15:06 ` Mike Snitzer
2020-08-11 3:45 ` Chao Leng [this message]
2020-08-07 0:03 ` [PATCH] nvme-core: fix io interrupt when work with dm-multipah Sagi Grimberg
2020-08-07 2:28 ` Chao Leng
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