exit 1
fi
+blkzone_reports_capacity() {
+ local dev="${1}"
+
+ [[ -n "${blkzone}" ]] &&
+ "${blkzone}" report -c 1 -o 0 "${dev}" | grep -q 'cap '
+}
+
+# Whether or not $1 (/dev/...) is a NVME ZNS device.
+is_nvme_zns() {
+ local s
+
+ s=/sys/block/$(basename "${1}")/device/subsystem
+
+ if [[ ! -h "${s}" || $(realpath "${s}") != /sys/class/nvme ]]; then
+ return 1
+ fi
+
+ [[ $(</sys/block/$(basename "${1}")/queue/zoned) == host-managed ]]
+}
+
+# Whether or not $1 (/dev/...) is a null_blk device with zone capacity smaller
+# than zone size.
+is_nullb_with_zone_cap() {
+ local f
+
+ f=/sys/kernel/config/nullb/$(basename "${1}")
+ [[ -r "${f}/zone_capacity" &&
+ $(<"${f}/zone_capacity") -lt $(<"${f}/zone_size") ]]
+}
+
+# Check if blkzone is available and suitable for the test target device. If not
+# available, print error message and return 1. Otherwise return 0.
+check_blkzone() {
+ local dev="${1}"
+
+ # If the device supports zone capacity, mandate zone capacity report by
+ # blkzone.
+ if (is_nvme_zns "${dev}" || is_nullb_with_zone_cap "${dev}") &&
+ ! blkzone_reports_capacity "${dev}"; then
+ echo "Error: blkzone does not report zone capacity"
+ echo "Error: install latest util-linux with blkzone"
+ return 1
+ fi
+}
+
# Reports the starting sector and length of the first sequential zone of device
# $1.
first_sequential_zone() {