HAMMER_CHKSPC_WRITE
_hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &info->rsvbigblocks);
_hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
_hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE)) != 0)