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Go Back   Linux Archive > Redhat > Device-mapper Development

 
 
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Old 04-08-2011, 05:39 PM
"Moger, Babu"
 
Default scsi_dh_rdac : decide on whether to send mode select or not based on operating mode

Based on the operating modes, handler decides whether to send mode select or not. Purpose here is to reduce
io-shipping as much as possible whenever there is an option.

Signed-off-by: Babu Moger <babu.moger@lsi.com>
Reviewed-by: Yanling Qi <yanling.qi@lsi.com>
Reviewed-by: Sudhir Dachepalli <Sudhir.Dachepalli@lis.com>
Reviewed-by: Somasundaram Krishnasamy <Somasundaram.Krishnasamy@lsi.com>
Reviewed-by: Bob Stankey <Robert.Stankey@lsi.com>
Reviewed-by: Vijay Chauhan <Vijay.Chauhan@lsi.com>

---
--- linux-2.6.38/drivers/scsi/device_handler/scsi_dh_rdac.c.orig 2011-03-17 16:57:51.000000000 -0500
+++ linux-2.6.38/drivers/scsi/device_handler/scsi_dh_rdac.c 2011-03-17 16:59:11.000000000 -0500
@@ -670,12 +670,27 @@ static int rdac_activate(struct scsi_dev
{
struct rdac_dh_data *h = get_rdac_data(sdev);
int err = SCSI_DH_OK;
+ int act = 0;

err = check_ownership(sdev, h);
if (err != SCSI_DH_OK)
goto done;

- if (h->lun_state == RDAC_LUN_UNOWNED) {
+ switch (h->mode) {
+ case RDAC_MODE:
+ if (h->lun_state == RDAC_LUN_UNOWNED)
+ act = 1;
+ break;
+ case RDAC_MODE_IOSHIP:
+ if ((h->lun_state == RDAC_LUN_UNOWNED) &&
+ (h->preferred == RDAC_PREFERRED))
+ act = 1;
+ break;
+ default:
+ break;
+ }
+
+ if (act) {
err = queue_mode_select(sdev, fn, data);
if (err == SCSI_DH_OK)
return 0;



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