if s.walkReadMu != nil {
					s.walkReadMu.Unlock()
				}
				diskHealthCheckOK(ctx, err)
				if err != nil {
					// It is totally possible that xl.meta was overwritten
					// while being concurrently listed at the same time in
					// such scenarios the 'xl.meta' might get truncated
					if !IsErrIgnored(err, io.EOF, io.ErrUnexpectedEOF) {
						internalLogOnceIf(ctx, err, "metacache-walk-read-metadata")
					}

	// shard value is the value per drive shard it
	// will vary based on the parity that is configured
	// for the STANDARD storage_class.
	// inlining means data and metadata are written
	// together in a single file i.e xl.meta
	InlineBlockEnv = "MINIO_STORAGE_CLASS_INLINE_BLOCK"

	// Supported storage class scheme is EC
	schemePrefix = "EC"

	// Min parity drives
	minParityDrives = 0

Extra metadata maintained internally in `xl.meta` for a transitioned object

```
...
        "MetaSys": {
          "x-minio-internal-transition-status": "Y29tcGxldGU=",
          "x-minio-internal-transition-tier": "R0NTVElFUjE=",

```JSON
{
  "title": "towel",
  "size": "XL"
}
```

받은 body를 포함해 데이터가 유효하지 않다고 알려주는 응답을 받게 됩니다:

```JSON hl_lines="12-15"
{
  "detail": [
    {
      "loc": [
        "body",
        "size"
      ],
      "msg": "value is not a valid integer",
      "type": "type_error.integer"
    }
  ],
  "body": {
    "title": "towel",
    "size": "XL"
  }
}
```

```JSON
{
  "title": "towel",
  "size": "XL"
}
```

你會收到一個告知資料無效、且包含所收到 body 的回應：

```JSON hl_lines="12-15"
{
  "detail": [
    {
      "loc": [
        "body",
        "size"
      ],
      "msg": "value is not a valid integer",
      "type": "type_error.integer"
    }
  ],
  "body": {
    "title": "towel",
    "size": "XL"
  }
}
```

func writeAllMetadataWithRevert(ctx context.Context, disks []StorageAPI, origbucket, bucket, prefix string, files []FileInfo, quorum int, revert bool) ([]StorageAPI, error) {
	g := errgroup.WithNErrs(len(disks))

	// Start writing `xl.meta` to all disks in parallel.
	for index := range disks {
		g.Go(func() error {
			if disks[index] == nil {
				return errDiskNotFound
			}
			// Pick one FileInfo for a disk at index.
			fi := files[index]

 CLASS_NAME_NAVBAR_LG_FIXED = 'layout-lg-navbar-fixed'\nconst CLASS_NAME_NAVBAR_XL_FIXED = 'layout-xl-navbar-fixed'\nconst CLASS_NAME_FOOTER_FIXED = 'layout-footer-fixed'\nconst CLASS_NAME_FOOTER_SM_FIXED = 'layout-sm-footer-fixed'\nconst CLASS_NAME_FOOTER_MD_FIXED = 'layout-md-footer-fixed'\nconst CLASS_NAME_FOOTER_LG_FIXED = 'layout-lg-footer-fixed'\nconst CLASS_NAME_FOOTER_XL_FIXED = 'layout-xl-footer-fixed'\n\nconst Default = {\n  controlsidebarSlide: true,\n  scrollbarTheme: 'os-theme-light',\n...

### Internal metadata for replication

`xl.meta` that is in use for [versioning](https://github.com/minio/minio/blob/master/docs/bucket/versioning/DESIGN.md) has additional metadata for replication of objects,delete markers and versioned deletes.

	if opts.MTime.IsZero() {
		modTime = UTCNow()
	}

	onlineDisks, partsMetadata = shuffleDisksAndPartsMetadata(onlineDisks, partsMetadata, fi)

	// Fill all the necessary metadata.
	// Update `xl.meta` content on each disks.
	for index := range partsMetadata {
		partsMetadata[index].Fresh = true
		partsMetadata[index].ModTime = modTime
		partsMetadata[index].Metadata = userDefined
	}

	}
	defer xhttp.DrainBody(respBody)

	dec := msgpNewReader(respBody)
	defer readMsgpReaderPoolPut(dec)

	err = fi.DecodeMsg(dec)
	return fi, err
}

// ReadXL - reads all contents of xl.meta of a file.
func (client *storageRESTClient) ReadXL(ctx context.Context, volume string, path string, readData bool) (rf RawFileInfo, err error) {
	ctx, cancel := context.WithTimeout(ctx, globalDriveConfig.GetMaxTimeout())