fix: remove restrictions on windows for NAME_MAX (#9469)

Fixes #9393

pkg/disk/root_disk_unix.go

@@ -0,0 +1,48 @@
+// +build !windows
+
+/*
+ * MinIO Cloud Storage, (C) 2019 MinIO, Inc.
+ *
+ * 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 disk
+
+import (
+	"os"
+	"syscall"
+)
+
+// IsRootDisk returns if diskPath belongs to root-disk, i.e the disk mounted at "/"
+func IsRootDisk(diskPath string) (bool, error) {
+	rootDisk := false
+	diskInfo, err := os.Stat(diskPath)
+	if err != nil {
+		return false, err
+	}
+	rootInfo, err := os.Stat("/")
+	if err != nil {
+		return false, err
+	}
+	diskStat, diskStatOK := diskInfo.Sys().(*syscall.Stat_t)
+	rootStat, rootStatOK := rootInfo.Sys().(*syscall.Stat_t)
+	if diskStatOK && rootStatOK {
+		if diskStat.Dev == rootStat.Dev {
+			// Indicate if the disk path is on root disk. This is used to indicate the healing
+			// process not to format the drive and end up healing it.
+			rootDisk = true
+		}
+	}
+	return rootDisk, nil
+}