[PATCH 4/9] selftests: ublk: track created devices for per-test cleanup

[Ming Lei]

Track device IDs in UBLK_DEVS array when created. Update
_cleanup_test() to only delete devices created by this test
instead of using 'del -a' which removes all devices.

This prepares for running tests concurrently where each test
should only clean up its own devices.

Signed-off-by: Ming Lei <ming....@redhat.com>
---
 tools/testing/selftests/ublk/test_common.sh | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/ublk/test_common.sh 
b/tools/testing/selftests/ublk/test_common.sh
index 0f1fdb0892b4..422882c32490 100755
--- a/tools/testing/selftests/ublk/test_common.sh
+++ b/tools/testing/selftests/ublk/test_common.sh
@@ -164,7 +164,12 @@ _check_add_dev()
 }
 
 _cleanup_test() {
-       "${UBLK_PROG}" del -a
+       if [ -f "${UBLK_TEST_DIR}/.ublk_devs" ]; then
+               while read -r dev_id; do
+                       ${UBLK_PROG} del -n "${dev_id}"
+               done < "${UBLK_TEST_DIR}/.ublk_devs"
+               rm -f "${UBLK_TEST_DIR}/.ublk_devs"
+       fi
 
        _remove_files
        rmdir ${UBLK_TEST_DIR}
@@ -205,6 +210,7 @@ _create_ublk_dev() {
        fi
 
        if [[ "$dev_id" =~ ^[0-9]+$ ]]; then
+               echo "$dev_id" >> "${UBLK_TEST_DIR}/.ublk_devs"
                echo "${dev_id}"
        else
                return 255
@@ -276,6 +282,11 @@ _ublk_del_dev() {
        local dev_id=$1
 
        ${UBLK_PROG} del -n "${dev_id}"
+
+       # Remove from tracking file
+       if [ -f "${UBLK_TEST_DIR}/.ublk_devs" ]; then
+               sed -i "/^${dev_id}$/d" "${UBLK_TEST_DIR}/.ublk_devs"
+       fi
 }
 
 __remove_ublk_dev_return() {
-- 
2.47.0