From: Hannes Reinecke <hare@suse.de>
To: Christoph Hellwig <hch@infradead.org>
Cc: James Bottomley <jbottomley@parallels.com>,
linux-scsi@vger.kernel.org, Ewan Milne <emilne@redhat.com>,
Ren Mingxin <renmx@cn.fujitsu.com>, Joern Engel <joern@logfs.org>,
James Smart <james.smart@emulex.com>,
Bart Van Assche <bvanassche@acm.org>,
Roland Dreier <roland@purestorage.com>
Subject: Re: [PATCHv5 0/9] New EH command timeout handler
Date: Mon, 02 Sep 2013 11:59:52 +0200 [thread overview]
Message-ID: <52246198.6070306@suse.de> (raw)
In-Reply-To: <20130902093129.GA17201@infradead.org>
On 09/02/2013 11:31 AM, Christoph Hellwig wrote:
> On Mon, Sep 02, 2013 at 10:54:13AM +0200, Hannes Reinecke wrote:
>> I don't mind. Having talked to the various SCSI folks everyone
>> agreed that calling abort asynchronously shouldn't do any harm.
>> At least as far as the SCSI spec goes.
>>
>> As for documentation: I didn't document it it currently as with my
>> implementation it's pretty much an optional thing.
>> But if we were to enable it globally it surely should be documented.
>>
>> So if there is a consensus I surely can enable it globally and
>> update the documentation.
>
> I would defintively love enabling it globally. As a fallback we should
> probably keep the old code for a while and prepare a way to disable
> the async code by a flag in the host template. If no reason to enable
> it shows up after a year ore two we can remove the old code entirely.
>
> I.e change the tail of scsi_times_out into something like:
>
>
> if (rtn == BLK_EH_NOT_HANDLED && !shost->hostt->no_async_abort) {
> if (scsi_abort_command(scmd))
> return BLK_EH_NOT_HANDLED;
> }
>
> scmd->result |= DID_TIME_OUT << 16;
> ...
>
> That way we don't even need the new BLK_EH_SCHEDULED return value and
> have all the handling in scsi_error.c
>
Right. Will be doing it.
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare@suse.de +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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next prev parent reply other threads:[~2013-09-02 9:59 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-02 7:12 [PATCHv5 0/9] New EH command timeout handler Hannes Reinecke
2013-09-02 7:12 ` [PATCH 1/9] scsi: Fix erratic device offline during EH Hannes Reinecke
2013-09-02 7:12 ` [PATCH 2/9] blk-timeout: add BLK_EH_SCHEDULED return code Hannes Reinecke
2013-09-02 7:12 ` [PATCH 3/9] scsi: improved eh timeout handler Hannes Reinecke
2013-09-02 12:45 ` Bart Van Assche
2013-09-02 13:11 ` Hannes Reinecke
2013-09-02 16:38 ` Bart Van Assche
2013-09-03 9:13 ` Bart Van Assche
2013-09-04 7:02 ` Hannes Reinecke
2013-09-02 7:13 ` [PATCH 4/9] virtio_scsi: Enable new EH " Hannes Reinecke
2013-09-02 7:13 ` [PATCH 5/9] libsas: " Hannes Reinecke
2013-09-02 7:13 ` [PATCH 6/9] mptsas: " Hannes Reinecke
2013-09-02 7:13 ` [PATCH 7/9] mpt2sas: " Hannes Reinecke
2013-09-02 7:13 ` [PATCH 8/9] mpt3sas: " Hannes Reinecke
2013-09-02 7:13 ` [PATCH 9/9] scsi_transport_fc: " Hannes Reinecke
2013-09-02 8:27 ` [PATCHv5 0/9] New EH command " Christoph Hellwig
2013-09-02 8:54 ` Hannes Reinecke
2013-09-02 9:31 ` Christoph Hellwig
2013-09-02 9:59 ` Hannes Reinecke [this message]
2013-09-03 16:36 ` Jörn Engel
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