Move cri server packages under pkg/cri

Organizes the cri related server packages under pkg/cri

Signed-off-by: Derek McGowan <derek@mcg.dev>

pkg/cri/server/imagefs_info.go

@@ -0,0 +1,52 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package server
+
+import (
+	"time"
+
+	"golang.org/x/net/context"
+
+	runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
+)
+
+// ImageFsInfo returns information of the filesystem that is used to store images.
+// TODO(windows): Usage for windows is always 0 right now. Support this for windows.
+func (c *criService) ImageFsInfo(ctx context.Context, r *runtime.ImageFsInfoRequest) (*runtime.ImageFsInfoResponse, error) {
+	snapshots := c.snapshotStore.List()
+	timestamp := time.Now().UnixNano()
+	var usedBytes, inodesUsed uint64
+	for _, sn := range snapshots {
+		// Use the oldest timestamp as the timestamp of imagefs info.
+		if sn.Timestamp < timestamp {
+			timestamp = sn.Timestamp
+		}
+		usedBytes += sn.Size
+		inodesUsed += sn.Inodes
+	}
+	// TODO(random-liu): Handle content store
+	return &runtime.ImageFsInfoResponse{
+		ImageFilesystems: []*runtime.FilesystemUsage{
+			{
+				Timestamp:  timestamp,
+				FsId:       &runtime.FilesystemIdentifier{Mountpoint: c.imageFSPath},
+				UsedBytes:  &runtime.UInt64Value{Value: usedBytes},
+				InodesUsed: &runtime.UInt64Value{Value: inodesUsed},
+			},
+		},
+	}, nil
+}