add ruleguard support, fix all the reported issues (#10335)

pkg/disk/stat_linux_32bit.go

@@ -0,0 +1,80 @@
+// +build linux,arm linux,386
+
+/*
+ * MinIO Cloud Storage, (C) 2020 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 (
+	"fmt"
+	"strconv"
+	"syscall"
+)
+
+// fsType2StringMap - list of filesystems supported on linux
+var fsType2StringMap = map[string]string{
+	"1021994":  "TMPFS",
+	"137d":     "EXT",
+	"4244":     "HFS",
+	"4d44":     "MSDOS",
+	"52654973": "REISERFS",
+	"5346544e": "NTFS",
+	"58465342": "XFS",
+	"61756673": "AUFS",
+	"6969":     "NFS",
+	"ef51":     "EXT2OLD",
+	"ef53":     "EXT4",
+	"f15f":     "ecryptfs",
+	"794c7630": "overlayfs",
+	"2fc12fc1": "zfs",
+	"ff534d42": "cifs",
+	"53464846": "wslfs",
+}
+
+// getFSType returns the filesystem type of the underlying mounted filesystem
+func getFSType(ftype int32) string {
+	fsTypeHex := strconv.FormatInt(int64(ftype), 16)
+	fsTypeString, ok := fsType2StringMap[fsTypeHex]
+	if !ok {
+		return "UNKNOWN"
+	}
+	return fsTypeString
+}
+
+// GetInfo returns total and free bytes available in a directory, e.g. `/`.
+func GetInfo(path string) (info Info, err error) {
+	s := syscall.Statfs_t{}
+	err = syscall.Statfs(path, &s)
+	if err != nil {
+		return Info{}, err
+	}
+	reservedBlocks := s.Bfree - s.Bavail
+	info = Info{
+		Total:  uint64(s.Frsize) * (s.Blocks - reservedBlocks),
+		Free:   uint64(s.Frsize) * s.Bavail,
+		Files:  s.Files,
+		Ffree:  s.Ffree,
+		FSType: getFSType(s.Type),
+	}
+	// Check for overflows.
+	// https://github.com/minio/minio/issues/8035
+	// XFS can show wrong values at times error out
+	// in such scenarios.
+	if info.Free > info.Total {
+		return info, fmt.Errorf("detected free space (%d) > total disk space (%d), fs corruption at (%s). please run 'fsck'", info.Free, info.Total, path)
+	}
+	return info, nil
+}