cri: support blockio class in pod and container annotations

This patch adds support for a container annotation and two separate
pod annotations for controlling the blockio class of containers.

The container annotation can be used by a CRI client:
  "io.kubernetes.cri.blockio-class"

Pod annotations specify the blockio class in the K8s pod spec level:
  "blockio.resources.beta.kubernetes.io/pod"
  (pod-wide default for all containers within)

  "blockio.resources.beta.kubernetes.io/container.<container_name>"
  (container-specific overrides)

Correspondingly, this patch adds support for --blockio-class and
--blockio-config-file to ctr, too.

This implementation follows the resource class annotation pattern
introduced in RDT and merged in commit 893701220.

Signed-off-by: Antti Kervinen <antti.kervinen@intel.com>

cmd/ctr/commands/run/run_unix.go

@@ -39,6 +39,7 @@ import (
 	"github.com/containerd/containerd/platforms"
 	"github.com/containerd/containerd/runtime/v2/runc/options"
 	"github.com/containerd/containerd/snapshots"
+	"github.com/intel/goresctrl/pkg/blockio"
 	"github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli"
@@ -329,6 +330,19 @@ func NewContainer(ctx gocontext.Context, client *containerd.Client, context *cli
 			})
 		}
 
+		if c := context.String("blockio-config-file"); c != "" {
+			if err := blockio.SetConfigFromFile(c, false); err != nil {
+				return nil, fmt.Errorf("blockio-config-file error: %w", err)
+			}
+		}
+
+		if c := context.String("blockio-class"); c != "" {
+			if linuxBlockIO, err := blockio.OciLinuxBlockIO(c); err == nil {
+				opts = append(opts, oci.WithBlockIO(linuxBlockIO))
+			} else {
+				return nil, fmt.Errorf("blockio-class error: %w", err)
+			}
+		}
 		if c := context.String("rdt-class"); c != "" {
 			opts = append(opts, oci.WithRdt(c, "", ""))
 		}