type poolAvailableSpace struct {
	Index      int
	Available  uint64 // in bytes
	MaxUsedPct int    // Used disk percentage of most filled disk, rounded down.
}

// TotalAvailable - total available space
func (p serverPoolsAvailableSpace) TotalAvailable() uint64 {
	total := uint64(0)
	for _, z := range p {
		total += z.Available
	}
	return total
}

type IAMSys struct {
	// Need to keep them here to keep alignment - ref: https://golang.org/pkg/sync/atomic/#pkg-note-BUG
	// metrics
	LastRefreshTimeUnixNano         uint64
	LastRefreshDurationMilliseconds uint64
	TotalRefreshSuccesses           uint64
	TotalRefreshFailures            uint64

	sync.Mutex

	iamRefreshInterval time.Duration

	LDAPConfig   xldap.Config  // only valid if usersSysType is LDAPUsers

			if err != nil {
				err = msgp.WrapError(err, "PartSizes")
				return
			}
			if cap(z.PartSizes) >= int(zb0007) {
				z.PartSizes = (z.PartSizes)[:zb0007]
			} else {
				z.PartSizes = make([]int64, zb0007)
			}
			for za0006 := range z.PartSizes {
				z.PartSizes[za0006], err = dc.ReadInt64()
				if err != nil {
					err = msgp.WrapError(err, "PartSizes", za0006)
					return
				}
			}

	if !unlockOnDefer {
		return fn(pr, h, pipeCloser, nsUnlocker)
	}

	return fn(pr, h, pipeCloser)
}

func (er erasureObjects) getObjectWithFileInfo(ctx context.Context, bucket, object string, startOffset int64, length int64, writer io.Writer, fi FileInfo, metaArr []FileInfo, onlineDisks []StorageAPI) error {
	// Reorder online disks based on erasure distribution order.
	// Reorder parts metadata based on erasure distribution order.

	{
		var b bytes.Buffer
		zipWriter := zip.NewWriter(&b)
		rawDataFn := func(r io.Reader, filename string, sz int) error {
			header, zerr := zip.FileInfoHeader(dummyFileInfo{
				name:    filename,
				size:    int64(sz),
				mode:    0o600,
				modTime: time.Now(),
				isDir:   false,
				sys:     nil,
			})
			if zerr != nil {
				adminLogIf(ctx, zerr)
				return nil
			}
			header.Method = zip.Deflate

	return dataUsageInfo, nil
}

func (s *xlStorage) getDeleteAttribute() uint64 {
	attr := "user.total_deletes"
	buf, err := xattr.LGet(s.formatFile, attr)
	if err != nil {
		// We start off with '0' if we can read the attributes
		return 0
	}
	return binary.LittleEndian.Uint64(buf[:8])
}

func (s *xlStorage) getWriteAttribute() uint64 {
	attr := "user.total_writes"
	buf, err := xattr.LGet(s.formatFile, attr)

		{bucketNames[0], objectNames[0], uploadIDs[0], 4, "mnop", "e132e96a5ddad6da8b07bba6f6131fef", int64(len("abcd"))},
		// Part with size larger than 5Mb.
		{bucketNames[0], objectNames[0], uploadIDs[0], 5, string(validPart), validPartMD5, int64(len(validPart))},
		{bucketNames[0], objectNames[0], uploadIDs[0], 6, string(validPart), validPartMD5, int64(len(validPart))},

}

func newBytesRSC(b []byte) io.ReadSeekCloser {
	r := bytes.NewReader(b)
	segmentReader := func(offset int64) (io.ReadCloser, error) {
		_, err := r.Seek(offset, io.SeekStart)
		if err != nil {
			return nil, err
		}
		return io.NopCloser(r), nil
	}
	return NewObjectReadSeekCloser(segmentReader, int64(len(b)))
}

type testResponseWriter struct {
	statusCode int
	response   []byte
}

	for _, object := range testObjects {
		md5Bytes := md5.Sum([]byte(object.content))
		_, err = obj.PutObject(context.Background(), object.parentBucket, object.name, mustGetPutObjReader(t, bytes.NewBufferString(object.content),
			int64(len(object.content)), hex.EncodeToString(md5Bytes[:]), ""), ObjectOptions{
			Versioned:   globalBucketVersioningSys.PrefixEnabled(object.parentBucket, object.name),
			UserDefined: object.meta,
		})
		if err != nil {

		if err2 != nil {
			// Just return the first error.
			return err
		}
		d.Policy = doc.Policy
		return nil
	}
	*d = doc
	return nil
}

// key options
type options struct {
	ttl int64 // expiry in seconds
}

type iamWatchEvent struct {
	isCreated bool // !isCreated implies a delete event.
	keyPath   string
}

// iamCache contains in-memory cache of IAM data.
type iamCache struct {