On 07/12/2014 06:48 PM, K. Y. Srinivasan wrote:
On Azure, we have seen instances of unbounded I/O latencies. To deal with
this issue, implement handler that can reset the timeout. Note that the
host gaurantees that it will respond to each command that has been issued.
Signed-off-by: K. Y. Srinivasan k...@microsoft.com
Cc: sta...@vger.kernel.org
---
drivers/scsi/storvsc_drv.c | 10 ++
1 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 7e8a642..3516761 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -33,6 +33,7 @@
#include linux/device.h
#include linux/hyperv.h
#include linux/mempool.h
+#include linux/blkdev.h
#include scsi/scsi.h
#include scsi/scsi_cmnd.h
#include scsi/scsi_host.h
@@ -1518,6 +1519,14 @@ static int storvsc_host_reset_handler(struct scsi_cmnd
*scmnd)
return SUCCESS;
}
+static enum blk_eh_timer_return storvsc_timeout_handler(struct scsi_cmnd
*scmnd)
+{
+ /*
+* The host will respond; ask for more time.
+*/
+ return BLK_EH_RESET_TIMER;
+}
+
static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd)
{
bool allowed = true;
@@ -1697,6 +1706,7 @@ static struct scsi_host_template scsi_driver = {
.bios_param = storvsc_get_chs,
.queuecommand = storvsc_queuecommand,
.eh_host_reset_handler =storvsc_host_reset_handler,
+ .eh_timed_out = storvsc_timeout_handler,
.slave_alloc = storvsc_device_alloc,
.slave_destroy =storvsc_device_destroy,
.slave_configure = storvsc_device_configure,
Reviewed-by: Hannes Reinecke h...@suse.de
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries Storage
h...@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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