linux-kernel - Re: [PATCH v2] storvsc: use default I/O timeout handler for FC devices

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Date:   Wed, 14 Jun 2017 10:24:38 +0200
From:   Johannes Thumshirn <jthumshirn@...e.de>
To:     Long Li <longli@...hange.microsoft.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        KY Srinivasan <kys@...rosoft.com>,
        Bart Van Assche <Bart.VanAssche@...disk.com>,
        Christoph Hellwig <hch@...radead.org>,
        Stephen Hemminger <sthemmin@...rosoft.com>
Cc:     Long Li <longli@...rosoft.com>
Subject: Re: [PATCH v2] storvsc: use default I/O timeout handler for FC
 devices

On 06/13/2017 11:34 PM, Long Li wrote:
> From: Long Li <longli@...rosoft.com>
> 
> FC disks issue I/O directly to the host storage port driver, this is
> diffirent to VHD disks where I/O is virtualized and timeout is handled
> by the host VSP (Virtualization Service Provider).
> 
> FC disks are usually setup in a multipath system, and they don't want to
> reset timer on I/O timeout. Timeout is detected by multipath as a good 
> time to failover and recover.
> 
> Patch v2 includes suggestions from Bart Van Assche
> <Bart.VanAssche@...disk.com>
> 
> Signed-off-by: Long Li <longli@...rosoft.com>
> ---
>  drivers/scsi/storvsc_drv.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
> index 8d955db..3cc8d67 100644
> --- a/drivers/scsi/storvsc_drv.c
> +++ b/drivers/scsi/storvsc_drv.c
> @@ -1495,6 +1495,10 @@ static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
>   */
>  static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd)
>  {
> +#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
> +	if (scmnd->device->host->transportt == fc_transport_template)
> +		return fc_eh_timed_out(scmnd);
> +#endif

Can you please change the #if IS_ENABLED() to
if(IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
	&& scmnd->device->host->transportt == fc_transport_template)

That way we have better compiler coverage.

Thanks,
	Johannes

-- 
Johannes Thumshirn                                          Storage
jthumshirn@...e.de                                +49 911 74053 689
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