/*
* alua_activate - activate a path
* @sdev: device on the path to be activated
*
* We're currently switching the port group to be activated only and
* let the array figure out the rest.
* There may be other arrays which require us to switch all port groups
* based on a certain policy. But until we actually encounter them it
* should be okay.
*/
static int alua_activate(struct scsi_device *sdev,
activate_complete fn, void *data)
{
struct alua_dh_data *h = get_alua_data(sdev);
int err = SCSI_DH_OK;
if (h->group_id != -1) {
err = alua_rtpg(sdev, h);
if (err != SCSI_DH_OK)
goto out;
}
if (h->tpgs & TPGS_MODE_EXPLICIT &&
h->state != TPGS_STATE_OPTIMIZED &&
h->state != TPGS_STATE_LBA_DEPENDENT) {
h->callback_fn = fn;
h->callback_data = data;
err = submit_stpg(h);
if (err == SCSI_DH_OK)
return 0;
h->callback_fn = h->callback_data = NULL;
}
out:
if (fn)
fn(data, err);
return 0;
}
/*
* alua_prep_fn - request callback
*
* Fail I/O to all paths not in state
* active/optimized or active/non-optimized.
*/
static int alua_prep_fn(struct scsi_device *sdev, struct request *req)
{
struct alua_dh_data *h = get_alua_data(sdev);
int ret = BLKPREP_OK;
if (h->state != TPGS_STATE_OPTIMIZED &&
h->state != TPGS_STATE_NONOPTIMIZED) {
ret = BLKPREP_KILL;
req->cmd_flags |= REQ_QUIET;
}
return ret;
}
/*
* alua_prep_fn - request callback
*
* Fail I/O to all paths not in state
* active/optimized or active/non-optimized.
*/
static int alua_prep_fn(struct scsi_device *sdev, struct request *req)
{
struct alua_dh_data *h = get_alua_data(sdev);
int ret = BLKPREP_OK;
if (h->state == TPGS_STATE_TRANSITIONING)
ret = BLKPREP_DEFER;
else if (h->state != TPGS_STATE_OPTIMIZED &&
h->state != TPGS_STATE_NONOPTIMIZED &&
h->state != TPGS_STATE_LBA_DEPENDENT) {
ret = BLKPREP_KILL;
req->cmd_flags |= REQ_QUIET;
}
return ret;
}