ReadIndexDir
status_t ReadIndexDir(void* cookie, void* buffer,
status_t error = volume->ReadIndexDir(cookie, buffer, bufferSize,
result = volume->ReadIndexDir(indexDirCookie, buffer, bufferSize,
virtual status_t ReadIndexDir(void* cookie, void* buffer,
virtual status_t ReadIndexDir(void* cookie, void* buffer,
virtual status_t ReadIndexDir(void* cookie, void* buffer,