linux-kernel - Re: [PATCH 6/8] Drivers: scsi: storvsc: Implement an abort handler

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Date:	Fri, 11 Jul 2014 11:52:55 +0200
From:	Hannes Reinecke <hare@...e.de>
To:	KY Srinivasan <kys@...rosoft.com>,
	Christoph Hellwig <hch@...radead.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"ohering@...e.com" <ohering@...e.com>,
	"jbottomley@...allels.com" <jbottomley@...allels.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"apw@...onical.com" <apw@...onical.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH 6/8] Drivers: scsi: storvsc: Implement an abort handler

On 07/11/2014 12:26 AM, KY Srinivasan wrote:
>
>
>> -----Original Message-----
>> From: Christoph Hellwig [mailto:hch@...radead.org]
>> Sent: Thursday, July 10, 2014 3:13 AM
>> To: KY Srinivasan
>> Cc: Christoph Hellwig; linux-kernel@...r.kernel.org;
>> devel@...uxdriverproject.org; ohering@...e.com;
>> jbottomley@...allels.com; jasowang@...hat.com; apw@...onical.com;
>> linux-scsi@...r.kernel.org
>> Subject: Re: [PATCH 6/8] Drivers: scsi: storvsc: Implement an abort handler
>>
>>
>> Note that you could increase the timeout and/or implement an
>> eh_timed_out handler that just returns BLK_EH_RESET_TIMER, but if the
>> completion takes too long the expectation is that a command will eventually
>> finish instead of beeing delayed by an unmound amount.
>
> I like this idea; I will implement a eh_timed_out_handler.
>
Something like this should be sufficient:

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index e71a0d7..630ae81 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1468,6 +1468,12 @@ static int storvsc_get_chs(struct scsi_device 
*sdev, stru
ct block_device * bdev,
         return 0;
  }

+static enum blk_eh_timer_return
+storvsc_timed_out_handler(struct scsi_cmnd *scmd)
+{
+       return BLK_EH_RESET_TIMER;
+}
+
  static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
  {
         struct hv_host_device *host_dev = 
shost_priv(scmnd->device->host);
@@ -1687,6 +1693,7 @@ static struct scsi_host_template scsi_driver = {
         .name =                 "storvsc_host_t",
         .bios_param =           storvsc_get_chs,
         .queuecommand =         storvsc_queuecommand,
+       .eh_timed_out =         storvsc_timed_out_handler,
         .eh_host_reset_handler =        storvsc_host_reset_handler,
         .slave_alloc =          storvsc_device_alloc,
         .slave_destroy =        storvsc_device_destroy,

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@...e.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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