t/zbd: add test for the case all write zones have small remainder

The previous commit fixed the unexpected write stop when all write
target zones have small remainder sectors to write. Add a test case to
confirm the fix.

Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Link: https://lore.kernel.org/r/20250414062721.87641-5-shinichiro.kawasaki@wdc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/t/zbd/test-zbd-support b/t/zbd/test-zbd-support
index 468fce708663c0de2e6dfd434fb20deb0f417e27..0278ac1742b6c47982dfa1e5dc75a796b72d62b8 100755 (executable)
--- a/t/zbd/test-zbd-support
+++ b/t/zbd/test-zbd-support
@@ -346,6 +346,14 @@ require_max_active_zones() {
        return 0
 }
 
+require_no_max_active_zones() {
+       if ((max_active_zones > 0)); then
+               SKIP_REASON="$dev has max_active_zones limit"
+               return 1
+       fi
+       return 0
+}
+
 # Check whether buffered writes are refused for block devices.
 test1() {
     require_block_dev || return $SKIP_TESTCASE
@@ -1637,6 +1645,46 @@ test70() {
                       >> "${logfile}.${test_number}" 2>&1
 }
 
+# Test random write does not end early when the zones as many as max_open_zones
+# have remainder smaller than block size.
+test71() {
+       local off size capacity zone_fill_size i
+
+       require_zbd || return "$SKIP_TESTCASE"
+       require_seq_zones 8 || return "$SKIP_TESTCASE"
+       require_no_max_active_zones || return "$SKIP_TESTCASE"
+
+       reset_zone "${dev}" -1
+
+       # Fill data to every other zone in the test target 8 zones. This leaves
+       # 4 zones in the implicit open condition. Leave 12kb remainder in the
+       # 4 zones.
+       off=$((first_sequential_zone_sector * 512))
+       size=$min_seq_write_size
+       capacity=$(total_zone_capacity 1 "$off" "$dev")
+       zone_fill_size=$((capacity - 3 * 4096))
+       run_one_fio_job "$(ioengine "psync")" --rw=write --offset="$off" \
+                       --bs=4k --zonemode=strided \
+                       --zonesize="$zone_fill_size" \
+                       --zonerange=$((zone_size * 2)) \
+                       --io_size=$((zone_fill_size * 4)) \
+                       >> "${logfile}.${test_number}" 2>&1 || return $?
+       # Close the 4 zones to not fail the next fio command with the
+       # --max_open_zones=1 option
+       for ((i = 0; i < 4; i++)); do
+               close_zone "$dev" $(((off + zone_size * 2 * i) / 512)) || return $?
+       done
+
+       # Run random write with 8kb block size
+       run_one_fio_job "$(ioengine "psync")" --rw=randwrite --offset="$off" \
+                       --bs=$((4096 * 2)) --zonemode=zbd \
+                       --zonesize="$zone_size" --size=$((zone_size * 8)) \
+                       --max_open_zones=1 --debug=zbd \
+                      >> "${logfile}.${test_number}" 2>&1 || return $?
+
+       check_written $((zone_size * 8)) || return $?
+}
+
 SECONDS=0
 tests=()
 dynamic_analyzer=()