selftests: ublk: improve test usability

Add UBLK_TEST_QUIET, so we can print test result(PASS/SKIP/FAIL) only.

Also always run from test script's current directory, then the same test
script can be started from other work directory.

This way helps a lot to reuse this test source code and scripts for
other projects(liburing, blktests, ...)

Signed-off-by: Ming Lei <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jens Axboe <[e-mail]>

tools/testing/selftests/ublk/test_common.sh

···
 	local type=$1
 	shift 1
 	modprobe ublk_drv
-	echo "ublk $type: $*"
+	[ "$UBLK_TEST_QUIET" -eq 0 ] && echo "ublk $type: $*"
 }
 
 _remove_test_files()
···
 	wait
 }
 
+_ublk_test_top_dir()
+{
+	cd "$(dirname "$0")" && pwd
+}
 
-UBLK_PROG=$(pwd)/kublk
+UBLK_PROG=$(_ublk_test_top_dir)/kublk
+UBLK_TEST_QUIET=1
 export UBLK_PROG
+export UBLK_TEST_QUIET

tools/testing/selftests/ublk/test_loop_01.sh

···
 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
-. test_common.sh
+. "$(cd "$(dirname "$0")" && pwd)"/test_common.sh
 
 TID="loop_01"
 ERR_CODE=0

tools/testing/selftests/ublk/test_loop_02.sh

···
 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
-. test_common.sh
+. "$(cd "$(dirname "$0")" && pwd)"/test_common.sh
 
 TID="loop_02"
 ERR_CODE=0

tools/testing/selftests/ublk/test_loop_03.sh

···
 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
-. test_common.sh
+. "$(cd "$(dirname "$0")" && pwd)"/test_common.sh
 
 TID="loop_03"
 ERR_CODE=0

tools/testing/selftests/ublk/test_loop_04.sh

···
 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
-. test_common.sh
+. "$(cd "$(dirname "$0")" && pwd)"/test_common.sh
 
 TID="loop_04"
 ERR_CODE=0

tools/testing/selftests/ublk/test_null_01.sh

···
 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
-. test_common.sh
+. "$(cd "$(dirname "$0")" && pwd)"/test_common.sh
 
 TID="null_01"
 ERR_CODE=0

tools/testing/selftests/ublk/test_stress_01.sh

···
 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
-. test_common.sh
+. "$(cd "$(dirname "$0")" && pwd)"/test_common.sh
 TID="stress_01"
 ERR_CODE=0
 DEV_ID=-1
···
 	DEV_ID=$(_add_ublk_dev "$@")
 	_check_add_dev $TID $? "${backfile}"
 
-	echo "run ublk IO vs. remove device(ublk add $*)"
+	[ "$UBLK_TEST_QUIET" -eq 0 ] && echo "run ublk IO vs. remove device(ublk add $*)"
 	if ! __run_io_and_remove "${DEV_ID}" "${size}" "no"; then
 		echo "/dev/ublkc${DEV_ID} isn't removed"
 		_remove_backfile "${backfile}"

tools/testing/selftests/ublk/test_stress_02.sh

···
 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
-. test_common.sh
+. "$(cd "$(dirname "$0")" && pwd)"/test_common.sh
 TID="stress_02"
 ERR_CODE=0
 DEV_ID=-1
···
 	DEV_ID=$(_add_ublk_dev "$@")
 	_check_add_dev $TID $? "${backfile}"
 
-	echo "run ublk IO vs kill ublk server(ublk add $*)"
+	[ "$UBLK_TEST_QUIET" -eq 0 ] && echo "run ublk IO vs kill ublk server(ublk add $*)"
 	if ! __run_io_and_remove "${DEV_ID}" "${size}" "yes"; then
 		echo "/dev/ublkc${DEV_ID} isn't removed res ${res}"
 		_remove_backfile "${backfile}"