QCowHeader header;
uint64_t ext_end;
- /* Performance is terrible right now with cache=writethrough due mainly
- * to reference count updates. If the user does not explicitly specify
- * a caching type, force to writeback caching.
- */
- if ((flags & BDRV_O_CACHE_DEF)) {
- flags |= BDRV_O_CACHE_WB;
- flags &= ~BDRV_O_CACHE_DEF;
- }
ret = bdrv_file_open(&s->hd, filename, flags);
if (ret < 0)
return ret;