提交 7a3ad392 编写于 作者: S Stewart, Sean 提交者: James Bottomley

[SCSI] scsi_dh_alua: Add module parameter to allow failover to non preferred path without STPG

Resending with requested rewording of the parameter description.  Currently
ALUA device handler sends STPG command during failover and failback.  Failover
can be optimized by implicit failover (by not to sending STPG command), when 1
is passed as hwhandler parameter in multipath.conf. ex "2 alua 1". We may need
to pass the parameter through module param for alua device handler to optimize
failover if incase retain_attached_hwhandler set in multipath.conf and
hwhandler is set with non-tpgs device handler ex: '1 rdac'.

[jejb: fix up whitespace and other issues]
Signed-off-by: NVijay Chauhan <vijay.chauhan@netapp.com>
Signed-off-by: NSean Stewart <Sean.Stewart@netapp.com>
Acked-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
上级 93f91dfa
......@@ -712,6 +712,10 @@ static int alua_set_params(struct scsi_device *sdev, const char *params)
return result;
}
static uint optimize_stpg;
module_param(optimize_stpg, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(optimize_stpg, "Allow use of a non-optimized path, rather than sending a STPG, when implicit TPGS is supported (0=No,1=Yes). Default is 0.");
/*
* alua_activate - activate a path
* @sdev: device on the path to be activated
......@@ -733,6 +737,9 @@ static int alua_activate(struct scsi_device *sdev,
if (err != SCSI_DH_OK)
goto out;
if (optimize_stpg)
h->flags |= ALUA_OPTIMIZE_STPG;
if (h->tpgs & TPGS_MODE_EXPLICIT) {
switch (h->state) {
case TPGS_STATE_NONOPTIMIZED:
......
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