selftests: ublk: add _ublk_del_dev helper function

Add _ublk_del_dev() to delete a specific ublk device by ID and
use it in all test scripts instead of calling UBLK_PROG directly.

Also remove unused _remove_ublk_devices() function.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: Ming Lei

tools/testing/selftests/ublk/test_common.sh

@@ -106,11 +106,6 @@ _check_root() {
 	fi
 }
 
-_remove_ublk_devices() {
-	${UBLK_PROG} del -a
-	modprobe -r ublk_drv > /dev/null 2>&1
-}
-
 _get_ublk_dev_state() {
 	${UBLK_PROG} list -n "$1" | grep "state" | awk '{print $11}'
 }
@@ -277,10 +272,16 @@ __ublk_kill_daemon()
 	echo "$state"
 }
 
-__remove_ublk_dev_return() {
+_ublk_del_dev() {
 	local dev_id=$1
 
 	${UBLK_PROG} del -n "${dev_id}"
+}
+
+__remove_ublk_dev_return() {
+	local dev_id=$1
+
+	_ublk_del_dev "${dev_id}"
 	local res=$?
 	udevadm settle
 	return ${res}

tools/testing/selftests/ublk/test_generic_16.sh

@@ -24,7 +24,7 @@ if ! ${UBLK_PROG} stop -n "${dev_id}" --safe; then
 fi
 
 # Clean up device
-${UBLK_PROG} del -n "${dev_id}" > /dev/null 2>&1
+_ublk_del_dev "${dev_id}" > /dev/null 2>&1
 udevadm settle
 
 # Test 2: stop --safe on device with active opener should fail
@@ -49,7 +49,7 @@ kill $dd_pid 2>/dev/null
 wait $dd_pid 2>/dev/null
 
 # Now device should be idle, regular delete should work
-${UBLK_PROG} del -n "${dev_id}"
+_ublk_del_dev "${dev_id}"
 udevadm settle
 
 _cleanup_test "null"

tools/testing/selftests/ublk/test_null_04.sh

@@ -34,7 +34,7 @@ _test_metadata_only() {
 		"$(cat "/sys/block/ublkb$dev_id/integrity/protection_interval_bytes")" 512 &&
 	_check_value "tag_size" "$(cat "/sys/block/ublkb$dev_id/integrity/tag_size")" 0
 
-	${UBLK_PROG} del -n "${dev_id}"
+	_ublk_del_dev "${dev_id}"
 }
 
 _test_integrity_capable_ip() {
@@ -53,7 +53,7 @@ _test_integrity_capable_ip() {
 		"$(cat "/sys/block/ublkb$dev_id/integrity/protection_interval_bytes")" 512 &&
 	_check_value "tag_size" "$(cat "/sys/block/ublkb$dev_id/integrity/tag_size")" 0
 
-	${UBLK_PROG} del -n "${dev_id}"
+	_ublk_del_dev "${dev_id}"
 }
 
 _test_integrity_reftag_t10dif() {
@@ -72,7 +72,7 @@ _test_integrity_reftag_t10dif() {
 		"$(cat "/sys/block/ublkb$dev_id/integrity/protection_interval_bytes")" 512 &&
 	_check_value "tag_size" "$(cat "/sys/block/ublkb$dev_id/integrity/tag_size")" 0
 
-	${UBLK_PROG} del -n "${dev_id}"
+	_ublk_del_dev "${dev_id}"
 }
 
 _test_nvme_csum() {
@@ -91,7 +91,7 @@ _test_nvme_csum() {
 		"$(cat "/sys/block/ublkb$dev_id/integrity/protection_interval_bytes")" 512 &&
 	_check_value "tag_size" "$(cat "/sys/block/ublkb$dev_id/integrity/tag_size")" 8
 
-	${UBLK_PROG} del -n "${dev_id}"
+	_ublk_del_dev "${dev_id}"
 }
 
 _prep_test "null" "integrity params"

tools/testing/selftests/ublk/test_part_02.sh

@@ -46,13 +46,13 @@ _test_partition_scan_no_hang()
 	if [ "$state" != "${expected_state}" ]; then
 		echo "FAIL: Device state is $state, expected ${expected_state}"
 		ERR_CODE=255
-		${UBLK_PROG} del -n "${dev_id}" > /dev/null 2>&1
+		_ublk_del_dev "${dev_id}" > /dev/null 2>&1
 		return
 	fi
 	echo "PASS: Device transitioned to ${expected_state} in ${elapsed}s without hanging"
 
 	# Clean up the device
-	${UBLK_PROG} del -n "${dev_id}" > /dev/null 2>&1
+	_ublk_del_dev "${dev_id}" > /dev/null 2>&1
 }
 
 _prep_test "partition_scan" "verify async partition scan prevents IO hang"