_hammer_checkspace
int _hammer_checkspace(hammer_mount_t hmp, int slop, int64_t *resp);
return(_hammer_checkspace(hmp, slop, NULL));
_hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &info->rsvbigblocks);
_hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
_hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);