[PATCH blktests 3/5] zbd/004: Check zone boundary writes using zones without zone capacity gap

[Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>]

The test case zbd/004 checks zone boundary write handling by block layer
using two contiguous sequential write required zones. This test is valid
when the first zone has same zone capacity as zone size. However, if the
zone has zone capacity smaller than zone size, the write in the zone
beyond zone capacity limit causes write error and the test fails.

To avoid the write error, find the two zones with first zone that has
zone capacity same as zone size. If such zones are not found, skip the
test case.

Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
---
 tests/zbd/004 |  6 +++++-
 tests/zbd/rc  | 11 +++++++++--
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/tests/zbd/004 b/tests/zbd/004
index ac0cf50..f09ee31 100755
--- a/tests/zbd/004
+++ b/tests/zbd/004
@@ -46,7 +46,11 @@ test_device() {
 
 	# Find target sequential required zones and reset write pointers
 	_get_blkzone_report "${TEST_DEV}" || return $?
-	idx=$(_find_two_contiguous_seq_zones) || return $?
+	if ! idx=$(_find_two_contiguous_seq_zones cap_eq_len); then
+		SKIP_REASON="No contiguous sequential write required zones"
+		_put_blkzone_report
+		return
+	fi
 	_reset_zones "${TEST_DEV}" "${idx}" "2"
 
 	# Confirm the zones are initialized
diff --git a/tests/zbd/rc b/tests/zbd/rc
index dafd130..3fd2d36 100644
--- a/tests/zbd/rc
+++ b/tests/zbd/rc
@@ -253,21 +253,28 @@ _find_sequential_zone_in_middle() {
 	return 1
 }
 
-# Search zones and find two contiguous sequential required zones.
+# Search zones and find two contiguous sequential write required zones.
 # Return index of the first zone of the found two zones.
+# When the argument cap_eq_len is specified, find the two contiguous
+# sequential write required zones with first zone that has zone capacity
+# same as zone size.
 # Call _get_blkzone_report() beforehand.
 _find_two_contiguous_seq_zones() {
+	local cap_eq_len="${1}"
 	local -i type_seq=${ZONE_TYPE_SEQ_WRITE_REQUIRED}
 
 	for ((idx = NR_CONV_ZONES; idx < REPORTED_COUNT; idx++)); do
 		if [[ ${ZONE_TYPES[idx]} -eq ${type_seq} &&
 		      ${ZONE_TYPES[idx+1]} -eq ${type_seq} ]]; then
+			if [[ -n ${cap_eq_len} ]] &&
+				   ((ZONE_CAPS[idx] != ZONE_LENGTHS[idx])); then
+				continue
+			fi
 			echo "${idx}"
 			return 0
 		fi
 	done
 
-	echo "Contiguous sequential write required zones not found"
 	return 1
 }
 
-- 
2.26.2