NumVersions:      1,
		SuccessorModTime: time.Time{},
	}
	xl := xlMetaV2{}
	var versions []FileInfo
	var allVersionIDs, freeVersionIDs []string
	for i := range 5 {
		fi := basefi
		fi.VersionID = mustGetUUID()
		fi.DataDir = mustGetUUID()
		fi.ModTime = basefi.ModTime.Add(time.Duration(i) * time.Second)
		if err := xl.AddVersion(fi); err != nil {
			t.Fatalf("%d: Failed to add version %v", i+1, err)
		}

package cmd

import (
	"os"
)

var (
	// No special option for reads on windows
	readMode = os.O_RDONLY

	// Write with sync no buffering only used only for `xl.meta` writes
	writeMode = os.O_SYNC

var (
	// Disallow updating access times
	// Add non-block to avoid syscall to attempt to set epoll on files.
	readMode = os.O_RDONLY | 0x40000 | syscall.O_NONBLOCK // O_NOATIME

	// Write with data sync only used only for `xl.meta` writes
	writeMode = 0x1000 | syscall.O_NONBLOCK // O_DSYNC

	// bigFileThreshold is the point where we add readahead to put operations.
	bigFileThreshold = 128 * humanize.MiByte

	// XL metadata file carries per object metadata.
	xlStorageFormatFile = "xl.meta"

	// XL metadata file backup file carries previous per object metadata.
	xlStorageFormatFileBackup = "xl.meta.bkp"
)

var alignedBuf []byte

func init() {
	alignedBuf = disk.AlignedBlock(xioutil.DirectioAlignSize)

		t.Fatalf("Unable to create a file \"as-file\", %s", err)
	}

	fi, err := xlStorage.ReadVersion(t.Context(), "", "exists-legacy", "as-file", "", ReadOptions{})
	if err != nil {
		t.Fatalf("Unable to read older 'xl.json' content: %s", err)
	}

	if !fi.XLV1 {

Harshavardhana <******@****.***> 1744208919 -0700

Anis Eleuch <******@****.***> 1701239716 -0800

		var xl xlMetaV2
		err = xl.Load(data)
		if err != nil {
			t.Fatal(err)
		}
		test(t, &xl)
	})
	t.Run("roundtrip", func(t *testing.T) {
		var xl xlMetaV2
		err = xl.Load(data)
		if err != nil {
			t.Fatal(err)
		}
		data, err = xl.AppendTo(nil)
		if err != nil {
			t.Fatal(err)
		}
		xl = xlMetaV2{}
		err = xl.Load(data)
		if err != nil {

//go:generate msgp -file=$GOFILE -unexported

// A xlMetaV1Object represents `xl.meta` metadata header.
type xlMetaV1Object struct {
	Version string   `json:"version"` // Version of the current `xl.meta`.
	Format  string   `json:"format"`  // Format of the current `xl.meta`.
	Stat    StatInfo `json:"stat"`    // Stat of the current object `xl.meta`.
	// Erasure coded info for the current object `xl.meta`.
	Erasure ErasureInfo `json:"erasure"`

		b.Run(fmt.Sprint(size, "-versions"), func(b *testing.B) {
			var xl xlMetaV2
			ids := make([]string, size)
			for i := range size {
				fi.VersionID = mustGetUUID()
				fi.DataDir = mustGetUUID()
				ids[i] = fi.VersionID
				fi.ModTime = fi.ModTime.Add(-time.Second)
				xl.AddVersion(fi)
			}
			// Encode all. This is used for benchmarking.
			enc, err := xl.AppendTo(nil)
			if err != nil {
				b.Fatal(err)
			}