t/zbd: get max_open_zones from sysfs

The helper bash function gets max_open_zones limit of the test target
device using sg_inq and libzbc tools. This works for SAS/SATA devices
but does not work for ZNS or null_blk devices. This results is running
the test case 31 with wrong max_open_zones value. Fix this by referring
max_open_zones sysfs attribute.

Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Link: https://lore.kernel.org/r/20230719105756.553146-10-shinichiro.kawasaki@wdc.com
Signed-off-by: Vincent Fu <vincent.fu@samsung.com>

diff --git a/t/zbd/functions b/t/zbd/functions
index 529e7944a2f8f3fba7f4e642e1bc283cfe7a20f9..4faa45a92df7831776acc752c7ae81e7440d9fb5 100644 (file)
--- a/t/zbd/functions
+++ b/t/zbd/functions
@@ -212,8 +212,14 @@ last_online_zone() {
 # max_open_zones in sysfs, or which lacks zoned block device support completely.
 max_open_zones() {
     local dev=$1
+    local realdev syspath
 
-    if [ -n "${sg_inq}" ] && [ ! -n "${use_libzbc}" ]; then
+    realdev=$(readlink -f "$dev")
+    syspath=/sys/block/${realdev##*/}/queue/max_open_zones
+
+    if [ -b "${realdev}" ] && [ -r "${syspath}" ]; then
+       cat ${syspath}
+    elif [ -n "${sg_inq}" ] && [ ! -n "${use_libzbc}" ]; then
        if ! ${sg_inq} -e --page=0xB6 --len=20 --hex "$dev" \
                 > /dev/null 2>&1; then
            # When sg_inq can not get max open zones, specify 0 which indicates