return nil, errServerNotInitialized
	}

	select {
	case <-sys.configLoaded:
		return sys.store.GetBucketUsers(bucket)
	case <-ctx.Done():
		return nil, ctx.Err()
	}
}

// ListUsers - list all users.
func (sys *IAMSys) ListUsers(ctx context.Context) (map[string]madmin.UserInfo, error) {
	if !sys.Initialized() {
		return nil, errServerNotInitialized
	}
	select {
	case <-sys.configLoaded:

		},
		{
			name:       "select-time-direct",
			input:      testInput,
			query:      `SELECT time from s3object s WHERE id = 2`,
			wantResult: `{"time":"2017-01-02T03:04Z"}`,
		},
		{
			name:       "select-int-direct",
			input:      testInput,
			query:      `SELECT num from s3object s WHERE id = 2`,
			wantResult: `{"num":"-5"}`,
		},
		{
			name:       "select-float-direct",
			input:      testInput,

}

// checkODirectDiskSupport asks the disk to write some data
// with O_DIRECT support, return an error if any and return
// errUnsupportedDisk if there is no O_DIRECT support
func (s *xlStorage) checkODirectDiskSupport(fsType string) error {
	if !disk.ODirectPlatform {
		return errUnsupportedDisk
	}

	// We know XFS already supports O_DIRECT no need to check.
	if fsType == "XFS" {
		return nil
	}

			if _, found := cache.iamPolicyDocsMap[p]; !found {
				err = errNoSuchPolicy
				return
			}
		}
		newPolicySet = existingPolicySet.Union(policiesToUpdate)
	} else {
		// policies to detach => inputPolicies ∩ existing (intersection)
		policiesToUpdate = policiesToUpdate.Intersection(existingPolicySet)
		newPolicySet = existingPolicySet.Difference(policiesToUpdate)
	}

	xlVersionMajor = 1

	// Non breaking changes.
	// Bumping this is informational, but should be done
	// if any change is made to the data stored, bumping this
	// will allow to detect the exact version later.
	xlVersionMinor = 3
)

func init() {
	binary.LittleEndian.PutUint16(xlVersionCurrent[0:2], xlVersionMajor)
	binary.LittleEndian.PutUint16(xlVersionCurrent[2:4], xlVersionMinor)
}

	}

	var updReq madmin.GroupAddRemove
	err = json.Unmarshal(data, &updReq)
	if err != nil {
		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrInvalidRequest), r.URL)
		return
	}

	// Reject if the group add and remove are temporary credentials, or root credential.
	for _, member := range updReq.Members {
		ok, _, err := globalIAMSys.IsTempUser(member)
		if err != nil && err != errNoSuchUser {