test: move UA drain helper function into iscsi-support

test_iscsi_tur_until_good() dispatches TUR requests until the target has
cleared all UAs for the given sd, or the maximum number of retries is
reached.
This helper function is useful for any test that needs to deal with UAs
(e.g. PRs), so should be moved out into common code.

Signed-off-by: David Disseldorp <ddiss@suse.de>

test-tool/test_multipathio_reset.c

@@ -27,36 +27,6 @@
 #include "iscsi-test-cu.h"
 #include "iscsi-multipath.h"
 
-#define MPATH_MAX_TUR_RETRIES 5
-
-static int
-test_iscsi_tur_until_good(struct scsi_device *iscsi_sd,
-			  int *num_uas)
-{
-	int num_turs;
-
-	*num_uas = 0;
-	for (num_turs = 0; num_turs < MPATH_MAX_TUR_RETRIES; num_turs++) {
-		struct scsi_task *tsk;
-		tsk = iscsi_testunitready_sync(iscsi_sd->iscsi_ctx,
-					       iscsi_sd->iscsi_lun);
-		if (tsk->status == SCSI_STATUS_GOOD) {
-			logging(LOG_VERBOSE, "TUR good after %d retries",
-				num_turs);
-			return 0;
-		} else if ((tsk->status == SCSI_STATUS_CHECK_CONDITION)
-			&& (tsk->sense.key == SCSI_SENSE_UNIT_ATTENTION)) {
-			logging(LOG_VERBOSE, "Got UA for TUR");
-			(*num_uas)++;
-		} else {
-			logging(LOG_NORMAL, "unexpected non-UA failure: %d,%d",
-				tsk->status, tsk->sense.key);
-		}
-	}
-
-	return -ETIMEDOUT;
-}
-
 void
 test_multipathio_reset(void)
 {