// RUnlock - block until read lock is released.
func (di *distLockInstance) RUnlock(lc LockContext) {
	if lc.cancel != nil {
		lc.cancel()
	}
	di.rwMutex.RUnlock(lc.ctx)
}

// localLockInstance - frontend/top-level interface for namespace locks.
type localLockInstance struct {
	ns     *nsLockMap
	volume string
	paths  []string
	opsID  string
}

// NewNSLock - returns a lock instance for a given volume and

		files, err := zipindex.ReadDir(b[len(b)-size:], objSize, nil)
		if err == nil {
			return files, gr.ObjInfo, nil
		}
		var terr zipindex.ErrNeedMoreData
		if errors.As(err, &terr) {
			size = int(terr.FromEnd)
			if size <= 0 || size > 100<<20 {
				return nil, ObjectInfo{}, errors.New("zip directory too large")
			}
		} else {
			return nil, ObjectInfo{}, err
		}
	}
}