// On success a sorted meta cache stream will be returned.
// Metadata has data stripped, if any.
func (s *xlStorage) WalkDir(ctx context.Context, opts WalkDirOptions, wr io.Writer) (err error) {
	legacyFS := !(s.fsType == xfs || s.fsType == ext4)

	s.RLock()
	legacy := s.formatLegacy
	s.RUnlock()

	// Verify if volume is valid and it exists.
	volumeDir, err := s.getVolDir(opts.Bucket)

### Consistency Guarantees

MinIO follows strict **read-after-write** and **list-after-write** consistency model for all i/o operations both in distributed and standalone modes. This consistency model is only guaranteed if you use disk filesystems such as xfs, zfs or btrfs etc.. for distributed setup.

Compression happens inflight, i.e objects are compressed before being written to disk(s).
MinIO uses [`klauspost/compress/s2`](https://github.com/klauspost/compress/tree/master/s2)
streaming compression due to its stability and performance.

This algorithm is specifically optimized for machine generated content.
Write throughput is typically at least 500MB/s per CPU core,
and scales with the number of available CPU cores.

// EncodeMsg implements msgp.Encodable
func (z *BucketMetadata) EncodeMsg(en *msgp.Writer) (err error) {
	// map header, size 25
	// write "Name"
	err = en.Append(0xde, 0x0, 0x19, 0xa4, 0x4e, 0x61, 0x6d, 0x65)
	if err != nil {
		return
	}
	err = en.WriteString(z.Name)
	if err != nil {
		err = msgp.WrapError(err, "Name")
		return
	}
	// write "Created"
	err = en.Append(0xa7, 0x43, 0x72, 0x65, 0x61, 0x74, 0x65, 0x64)

	MinIOSourceMTime = "x-minio-source-mtime"

	// Header indicates if the etag should be preserved by client
	MinIOSourceETag = "x-minio-source-etag"

	// Writes expected write quorum
	MinIOWriteQuorum = "x-minio-write-quorum"

	// Reads expected read quorum
	MinIOReadQuorum = "x-minio-read-quorum"

	// Indicates if we are using default storage class and there was problem loading config

}

// validPAXRecord reports whether the key-value pair is valid where each
// record is formatted as:
//
//	"%d %s=%s\n" % (size, key, value)
//
// Keys and values should be UTF-8, but the number of bad writers out there
// forces us to be a more liberal.
// Thus, we only reject all keys with NUL, and only reject NULs in values
// for the PAX version of the USTAR string fields.
// The key must not contain an '=' character.

            throws ModelInterpolationException {
        StringWriter sWriter = new StringWriter(1024);

        MavenStaxWriter writer = new MavenStaxWriter();
        try {
            writer.write(sWriter, model.getDelegate());
        } catch (IOException | XMLStreamException e) {
            throw new ModelInterpolationException("Cannot serialize project model for interpolation.", e);

            writer.println();
            writer.print("    - [");
            writer.print(problem.getSeverity());
            writer.print("] ");
            writer.print(problem.getMessage());
            String location = ModelProblemUtils.formatLocation(problem, modelId);
            if (!location.isEmpty()) {
                writer.print(" @ ");
                writer.print(location);
            }
        }

              override fun contentLength(): Long = postBytes.size.toLong()

              override fun writeTo(sink: BufferedSink) {
                sink.write(postBytes) // push bytes into the stream's buffer
                sink.flush() // Http2Connection.writeData subject to write window
                sink.close() // Http2Connection.writeData empty frame
              }
            },
        ),
      )

 * entries may be counted in {@link Cache#size}, but will never be visible to read or write
 * operations.
 *
 * <p>Certain cache configurations will result in the accrual of periodic maintenance tasks which
 * will be performed during write operations, or during occasional read operations in the absence of
 * writes. The {@link Cache#cleanUp} method of the returned cache will also perform maintenance, but