Implement 'podman run --blkio-weight-device'

`--blkio-weight-device` is not fully implemented and this causes an
unexpected panic when specified because an entry is put into an
uninitialized map at parsing.

This fix implements the `--blkio-weight-device` and adds a system test.
When creating a spec generator on a client, a major number and a minor
number of a device cannot be set. So, these numbers are inspected on a
server and set to a runtime spec.

Signed-off-by: Hironori Shiina <shiina.hironori@jp.fujitsu.com>

1 files changed, 69 insertions, 0 deletions

diff --git a/test/system/180-blkio.bats b/test/system/180-blkio.bats
new file mode 100644
index 000000000..68449681a
--- /dev/null
+++ b/test/system/180-blkio.bats
@@ -0,0 +1,69 @@
+#!/usr/bin/env bats   -*- bats -*-
+#
+# podman blkio-related tests
+#
+
+load helpers
+
+function teardown() {
+    lofile=${PODMAN_TMPDIR}/disk.img
+    if [ -f ${lofile} ]; then
+        run_podman '?' rm -t 0 --all --force
+
+        while read path dev; do
+            if [[ "$path" == "$lofile" ]]; then
+                losetup -d $dev
+            fi
+        done < <(losetup -l --noheadings --output BACK-FILE,NAME)
+
+        rm ${lofile}
+    fi
+    basic_teardown
+}
+
+@test "podman run --blkio-weight-device" {
+
+    skip_if_rootless "cannot create devices in rootless mode"
+
+    # create loopback device
+    lofile=${PODMAN_TMPDIR}/disk.img
+    fallocate -l 1k  ${lofile}
+    losetup -f ${lofile}
+
+    run losetup -l --noheadings --output BACK-FILE,NAME,MAJ:MIN
+    is "$output" ".\+" "Empty output from losetup"
+
+    lodevice=$(awk "\$1 == \"$lofile\" { print \$2 }" <<<"$output")
+    lomajmin=$(awk "\$1 == \"$lofile\" { print \$3 }" <<<"$output")
+
+    is "$lodevice" ".\+" "Could not determine device for $lofile"
+    is "$lomajmin" ".\+" "Could not determine major/minor for $lofile"
+
+    # use bfq io scheduler
+    run grep -w bfq /sys/block/$(basename ${lodevice})/queue/scheduler
+    if [ $status -ne 0 ]; then
+        skip "BFQ scheduler is not supported on the system"
+    fi
+    echo bfq > /sys/block/$(basename ${lodevice})/queue/scheduler
+
+    # run podman
+    if is_cgroupsv2; then
+        if [ ! -f /sys/fs/cgroup/system.slice/io.bfq.weight ]; then
+            skip "Kernel does not support BFQ IO scheduler"
+        fi
+        run_podman run --device ${lodevice}:${lodevice} --blkio-weight-device ${lodevice}:123 --rm $IMAGE \
+            /bin/sh -c "cat /sys/fs/cgroup/\$(sed -e 's/0:://' < /proc/self/cgroup)/io.bfq.weight"
+        is "${lines[1]}" "${lomajmin}\s\+123"
+    else
+        if [ ! -f /sys/fs/cgroup/blkio/system.slice/blkio.bfq.weight_device ]; then
+            skip "Kernel does not support BFQ IO scheduler"
+        fi
+        if [ $(podman_runtime) = "crun" ]; then
+            # As of crun 1.2, crun doesn't support blkio.bfq.weight_device
+            skip "crun doesn't support blkio.bfq.weight_device"
+        fi
+        run_podman run --device ${lodevice}:${lodevice} --blkio-weight-device ${lodevice}:123 --rm $IMAGE \
+            /bin/sh -c "cat /sys/fs/cgroup/blkio/blkio.bfq.weight_device"
+        is "${lines[1]}" "${lomajmin}\s\+123"
+    fi
+}