Since version v6.5, kernel no longer provides scheduler sysfs attribute
of bio based device-mapper. If TEST_DEV is a bio based device-mapper and
the test case requires specific scheduler, it is required to modify
sysfs attributes of destination devices instead of TEST_DEV.
To set scheduler to the sysfs attribute of destination devices, add the
helper function _dm_destination_dev_set_scheduler. It saves the original
scheduler value in the associative array SYSFS_QUEUE_SAVED so that it is
restored at each test case end. Also add _test_dev_set_scheduler which
sets scheduler regardless whether TEST_DEV is a bio based device-mapper
or not.
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@xxxxxxx>
---
common/dm | 21 +++++++++++++++++++++
common/rc | 9 +++++++++
2 files changed, 30 insertions(+)
diff --git a/common/dm b/common/dm
index 85e1ed9..14f4265 100644
--- a/common/dm
+++ b/common/dm
@@ -21,3 +21,24 @@ _get_dev_path_by_id() {
done
return 1
}
+
+_dm_destination_dev_set_scheduler() {
+ local dest_dev_id dest_dev path
+
+ while read -r dest_dev_id; do
+ if ! dest_dev=$(_get_dev_path_by_id "${dest_dev_id}"); then
+ continue
+ fi
+ path=${dest_dev/dev/sys\/block}/queue/scheduler
+ if [[ ! -w ${path} ]]; then
+ echo "Can not set scheduler of device mapper destination: ${dest_dev}"
+ continue
+ fi
+ if [[ ${SYSFS_QUEUE_SAVED["$path"]-unset} == unset ]]; then
+ SYSFS_QUEUE_SAVED["$path"]="$(sed \
+ -e 's/.*\[//' -e 's/\].*//' "${path}")"
+ fi
+ echo "${1}" > "${path}"
+ done < <(dmsetup table "$(<"${TEST_DEV_SYSFS}/dm/name")" |
+ sed -n 's/.* \([0-9]*:[0-9]*\).*/\1/p')
+}
diff --git a/common/rc b/common/rc
index 4984100..52d1602 100644
--- a/common/rc
+++ b/common/rc
@@ -10,6 +10,7 @@ shopt -s extglob
# Include fio helpers by default.
. common/fio
. common/cgroup
+. common/dm
# If a test runs multiple "subtests", then each subtest should typically run
# for TIMEOUT / number of subtests.
@@ -294,6 +295,14 @@ _test_dev_queue_set() {
echo "$2" >"$path"
}
+_test_dev_set_scheduler() {
+ if [[ -w "${TEST_DEV_SYSFS}/queue/scheduler" ]]; then
+ _test_dev_queue_set scheduler "$1"
+ elif _test_dev_is_dm; then
+ _dm_destination_dev_set_scheduler "$1"
+ fi
+}
+
_require_test_dev_is_pci() {
if ! readlink -f "$TEST_DEV_SYSFS/device" | grep -q pci; then
# nvme needs some special casing
--
2.40.1
